| Methods Summary |
|---|
| public void | addFocusables(java.util.ArrayList views, int direction, int focusableMode)We only want the current page that is being shown to be focusable.
final int focusableCount = views.size();
final int descendantFocusability = getDescendantFocusability();
if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) {
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
child.addFocusables(views, direction, focusableMode);
}
}
}
}
// we add ourselves (if focusable) in all cases except for when we are
// FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is
// to avoid the focus search finding layouts when a more precise search
// among the focusable children would be more interesting.
if (
descendantFocusability != FOCUS_AFTER_DESCENDANTS ||
// No focusable descendants
(focusableCount == views.size())) {
// Note that we can't call the superclass here, because it will
// add all views in. So we need to do the same thing View does.
if (!isFocusable()) {
return;
}
if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE &&
isInTouchMode() && !isFocusableInTouchMode()) {
return;
}
if (views != null) {
views.add(this);
}
}
|
| android.support.v4.view.ViewPager$ItemInfo | addNewItem(int position, int index)
ItemInfo ii = new ItemInfo();
ii.position = position;
ii.object = mAdapter.instantiateItem(this, position);
ii.widthFactor = mAdapter.getPageWidth(position);
if (index < 0 || index >= mItems.size()) {
mItems.add(ii);
} else {
mItems.add(index, ii);
}
return ii;
|
| public void | addTouchables(java.util.ArrayList views)We only want the current page that is being shown to be touchable.
// Note that we don't call super.addTouchables(), which means that
// we don't call View.addTouchables(). This is okay because a ViewPager
// is itself not touchable.
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
child.addTouchables(views);
}
}
}
|
| public void | addView(android.view.View child, int index, ViewGroup.LayoutParams params)
if (!checkLayoutParams(params)) {
params = generateLayoutParams(params);
}
final LayoutParams lp = (LayoutParams) params;
lp.isDecor |= child instanceof Decor;
if (mInLayout) {
if (lp != null && lp.isDecor) {
throw new IllegalStateException("Cannot add pager decor view during layout");
}
lp.needsMeasure = true;
addViewInLayout(child, index, params);
} else {
super.addView(child, index, params);
}
if (USE_CACHE) {
if (child.getVisibility() != GONE) {
child.setDrawingCacheEnabled(mScrollingCacheEnabled);
} else {
child.setDrawingCacheEnabled(false);
}
}
|
| public boolean | arrowScroll(int direction)
View currentFocused = findFocus();
if (currentFocused == this) {
currentFocused = null;
} else if (currentFocused != null) {
boolean isChild = false;
for (ViewParent parent = currentFocused.getParent(); parent instanceof ViewGroup;
parent = parent.getParent()) {
if (parent == this) {
isChild = true;
break;
}
}
if (!isChild) {
// This would cause the focus search down below to fail in fun ways.
final StringBuilder sb = new StringBuilder();
sb.append(currentFocused.getClass().getSimpleName());
for (ViewParent parent = currentFocused.getParent(); parent instanceof ViewGroup;
parent = parent.getParent()) {
sb.append(" => ").append(parent.getClass().getSimpleName());
}
Log.e(TAG, "arrowScroll tried to find focus based on non-child " +
"current focused view " + sb.toString());
currentFocused = null;
}
}
boolean handled = false;
View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused,
direction);
if (nextFocused != null && nextFocused != currentFocused) {
if (direction == View.FOCUS_LEFT) {
// If there is nothing to the left, or this is causing us to
// jump to the right, then what we really want to do is page left.
final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left;
final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left;
if (currentFocused != null && nextLeft >= currLeft) {
handled = pageLeft();
} else {
handled = nextFocused.requestFocus();
}
} else if (direction == View.FOCUS_RIGHT) {
// If there is nothing to the right, or this is causing us to
// jump to the left, then what we really want to do is page right.
final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left;
final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left;
if (currentFocused != null && nextLeft <= currLeft) {
handled = pageRight();
} else {
handled = nextFocused.requestFocus();
}
}
} else if (direction == FOCUS_LEFT || direction == FOCUS_BACKWARD) {
// Trying to move left and nothing there; try to page.
handled = pageLeft();
} else if (direction == FOCUS_RIGHT || direction == FOCUS_FORWARD) {
// Trying to move right and nothing there; try to page.
handled = pageRight();
}
if (handled) {
playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction));
}
return handled;
|
| public boolean | beginFakeDrag()Start a fake drag of the pager.
A fake drag can be useful if you want to synchronize the motion of the ViewPager
with the touch scrolling of another view, while still letting the ViewPager
control the snapping motion and fling behavior. (e.g. parallax-scrolling tabs.)
Call {@link #fakeDragBy(float)} to simulate the actual drag motion. Call
{@link #endFakeDrag()} to complete the fake drag and fling as necessary.
During a fake drag the ViewPager will ignore all touch events. If a real drag
is already in progress, this method will return false.
if (mIsBeingDragged) {
return false;
}
mFakeDragging = true;
setScrollState(SCROLL_STATE_DRAGGING);
mInitialMotionX = mLastMotionX = 0;
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
} else {
mVelocityTracker.clear();
}
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(time, time, MotionEvent.ACTION_DOWN, 0, 0, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
mFakeDragBeginTime = time;
return true;
|
| private void | calculatePageOffsets(android.support.v4.view.ViewPager$ItemInfo curItem, int curIndex, android.support.v4.view.ViewPager$ItemInfo oldCurInfo)
final int N = mAdapter.getCount();
final int width = getClientWidth();
final float marginOffset = width > 0 ? (float) mPageMargin / width : 0;
// Fix up offsets for later layout.
if (oldCurInfo != null) {
final int oldCurPosition = oldCurInfo.position;
// Base offsets off of oldCurInfo.
if (oldCurPosition < curItem.position) {
int itemIndex = 0;
ItemInfo ii = null;
float offset = oldCurInfo.offset + oldCurInfo.widthFactor + marginOffset;
for (int pos = oldCurPosition + 1;
pos <= curItem.position && itemIndex < mItems.size(); pos++) {
ii = mItems.get(itemIndex);
while (pos > ii.position && itemIndex < mItems.size() - 1) {
itemIndex++;
ii = mItems.get(itemIndex);
}
while (pos < ii.position) {
// We don't have an item populated for this,
// ask the adapter for an offset.
offset += mAdapter.getPageWidth(pos) + marginOffset;
pos++;
}
ii.offset = offset;
offset += ii.widthFactor + marginOffset;
}
} else if (oldCurPosition > curItem.position) {
int itemIndex = mItems.size() - 1;
ItemInfo ii = null;
float offset = oldCurInfo.offset;
for (int pos = oldCurPosition - 1;
pos >= curItem.position && itemIndex >= 0; pos--) {
ii = mItems.get(itemIndex);
while (pos < ii.position && itemIndex > 0) {
itemIndex--;
ii = mItems.get(itemIndex);
}
while (pos > ii.position) {
// We don't have an item populated for this,
// ask the adapter for an offset.
offset -= mAdapter.getPageWidth(pos) + marginOffset;
pos--;
}
offset -= ii.widthFactor + marginOffset;
ii.offset = offset;
}
}
}
// Base all offsets off of curItem.
final int itemCount = mItems.size();
float offset = curItem.offset;
int pos = curItem.position - 1;
mFirstOffset = curItem.position == 0 ? curItem.offset : -Float.MAX_VALUE;
mLastOffset = curItem.position == N - 1 ?
curItem.offset + curItem.widthFactor - 1 : Float.MAX_VALUE;
// Previous pages
for (int i = curIndex - 1; i >= 0; i--, pos--) {
final ItemInfo ii = mItems.get(i);
while (pos > ii.position) {
offset -= mAdapter.getPageWidth(pos--) + marginOffset;
}
offset -= ii.widthFactor + marginOffset;
ii.offset = offset;
if (ii.position == 0) mFirstOffset = offset;
}
offset = curItem.offset + curItem.widthFactor + marginOffset;
pos = curItem.position + 1;
// Next pages
for (int i = curIndex + 1; i < itemCount; i++, pos++) {
final ItemInfo ii = mItems.get(i);
while (pos < ii.position) {
offset += mAdapter.getPageWidth(pos++) + marginOffset;
}
if (ii.position == N - 1) {
mLastOffset = offset + ii.widthFactor - 1;
}
ii.offset = offset;
offset += ii.widthFactor + marginOffset;
}
mNeedCalculatePageOffsets = false;
|
| protected boolean | canScroll(android.view.View v, boolean checkV, int dx, int x, int y)Tests scrollability within child views of v given a delta of dx.
if (v instanceof ViewGroup) {
final ViewGroup group = (ViewGroup) v;
final int scrollX = v.getScrollX();
final int scrollY = v.getScrollY();
final int count = group.getChildCount();
// Count backwards - let topmost views consume scroll distance first.
for (int i = count - 1; i >= 0; i--) {
// TODO: Add versioned support here for transformed views.
// This will not work for transformed views in Honeycomb+
final View child = group.getChildAt(i);
if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() &&
y + scrollY >= child.getTop() && y + scrollY < child.getBottom() &&
canScroll(child, true, dx, x + scrollX - child.getLeft(),
y + scrollY - child.getTop())) {
return true;
}
}
}
return checkV && ViewCompat.canScrollHorizontally(v, -dx);
|
| public boolean | canScrollHorizontally(int direction)
if (mAdapter == null) {
return false;
}
final int width = getClientWidth();
final int scrollX = getScrollX();
if (direction < 0) {
return (scrollX > (int) (width * mFirstOffset));
} else if (direction > 0) {
return (scrollX < (int) (width * mLastOffset));
} else {
return false;
}
|
| protected boolean | checkLayoutParams(ViewGroup.LayoutParams p)
return p instanceof LayoutParams && super.checkLayoutParams(p);
|
| private void | completeScroll(boolean postEvents)
boolean needPopulate = mScrollState == SCROLL_STATE_SETTLING;
if (needPopulate) {
// Done with scroll, no longer want to cache view drawing.
setScrollingCacheEnabled(false);
mScroller.abortAnimation();
int oldX = getScrollX();
int oldY = getScrollY();
int x = mScroller.getCurrX();
int y = mScroller.getCurrY();
if (oldX != x || oldY != y) {
scrollTo(x, y);
}
}
mPopulatePending = false;
for (int i=0; i<mItems.size(); i++) {
ItemInfo ii = mItems.get(i);
if (ii.scrolling) {
needPopulate = true;
ii.scrolling = false;
}
}
if (needPopulate) {
if (postEvents) {
ViewCompat.postOnAnimation(this, mEndScrollRunnable);
} else {
mEndScrollRunnable.run();
}
}
|
| public void | computeScroll()
if (!mScroller.isFinished() && mScroller.computeScrollOffset()) {
int oldX = getScrollX();
int oldY = getScrollY();
int x = mScroller.getCurrX();
int y = mScroller.getCurrY();
if (oldX != x || oldY != y) {
scrollTo(x, y);
if (!pageScrolled(x)) {
mScroller.abortAnimation();
scrollTo(0, y);
}
}
// Keep on drawing until the animation has finished.
ViewCompat.postInvalidateOnAnimation(this);
return;
}
// Done with scroll, clean up state.
completeScroll(true);
|
| void | dataSetChanged()
// This method only gets called if our observer is attached, so mAdapter is non-null.
final int adapterCount = mAdapter.getCount();
mExpectedAdapterCount = adapterCount;
boolean needPopulate = mItems.size() < mOffscreenPageLimit * 2 + 1 &&
mItems.size() < adapterCount;
int newCurrItem = mCurItem;
boolean isUpdating = false;
for (int i = 0; i < mItems.size(); i++) {
final ItemInfo ii = mItems.get(i);
final int newPos = mAdapter.getItemPosition(ii.object);
if (newPos == PagerAdapter.POSITION_UNCHANGED) {
continue;
}
if (newPos == PagerAdapter.POSITION_NONE) {
mItems.remove(i);
i--;
if (!isUpdating) {
mAdapter.startUpdate(this);
isUpdating = true;
}
mAdapter.destroyItem(this, ii.position, ii.object);
needPopulate = true;
if (mCurItem == ii.position) {
// Keep the current item in the valid range
newCurrItem = Math.max(0, Math.min(mCurItem, adapterCount - 1));
needPopulate = true;
}
continue;
}
if (ii.position != newPos) {
if (ii.position == mCurItem) {
// Our current item changed position. Follow it.
newCurrItem = newPos;
}
ii.position = newPos;
needPopulate = true;
}
}
if (isUpdating) {
mAdapter.finishUpdate(this);
}
Collections.sort(mItems, COMPARATOR);
if (needPopulate) {
// Reset our known page widths; populate will recompute them.
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (!lp.isDecor) {
lp.widthFactor = 0.f;
}
}
setCurrentItemInternal(newCurrItem, false, true);
requestLayout();
}
|
| private int | determineTargetPage(int currentPage, float pageOffset, int velocity, int deltaX)
int targetPage;
if (Math.abs(deltaX) > mFlingDistance && Math.abs(velocity) > mMinimumVelocity) {
targetPage = velocity > 0 ? currentPage : currentPage + 1;
} else {
final float truncator = currentPage >= mCurItem ? 0.4f : 0.6f;
targetPage = (int) (currentPage + pageOffset + truncator);
}
if (mItems.size() > 0) {
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
// Only let the user target pages we have items for
targetPage = Math.max(firstItem.position, Math.min(targetPage, lastItem.position));
}
return targetPage;
|
| public boolean | dispatchKeyEvent(android.view.KeyEvent event)
// Let the focused view and/or our descendants get the key first
return super.dispatchKeyEvent(event) || executeKeyEvent(event);
|
| public boolean | dispatchPopulateAccessibilityEvent(android.view.accessibility.AccessibilityEvent event)
// Dispatch scroll events from this ViewPager.
if (event.getEventType() == AccessibilityEventCompat.TYPE_VIEW_SCROLLED) {
return super.dispatchPopulateAccessibilityEvent(event);
}
// Dispatch all other accessibility events from the current page.
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
final ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem &&
child.dispatchPopulateAccessibilityEvent(event)) {
return true;
}
}
}
return false;
|
| float | distanceInfluenceForSnapDuration(float f)
f -= 0.5f; // center the values about 0.
f *= 0.3f * Math.PI / 2.0f;
return (float) Math.sin(f);
|
| public void | draw(android.graphics.Canvas canvas)
super.draw(canvas);
boolean needsInvalidate = false;
final int overScrollMode = ViewCompat.getOverScrollMode(this);
if (overScrollMode == ViewCompat.OVER_SCROLL_ALWAYS ||
(overScrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS &&
mAdapter != null && mAdapter.getCount() > 1)) {
if (!mLeftEdge.isFinished()) {
final int restoreCount = canvas.save();
final int height = getHeight() - getPaddingTop() - getPaddingBottom();
final int width = getWidth();
canvas.rotate(270);
canvas.translate(-height + getPaddingTop(), mFirstOffset * width);
mLeftEdge.setSize(height, width);
needsInvalidate |= mLeftEdge.draw(canvas);
canvas.restoreToCount(restoreCount);
}
if (!mRightEdge.isFinished()) {
final int restoreCount = canvas.save();
final int width = getWidth();
final int height = getHeight() - getPaddingTop() - getPaddingBottom();
canvas.rotate(90);
canvas.translate(-getPaddingTop(), -(mLastOffset + 1) * width);
mRightEdge.setSize(height, width);
needsInvalidate |= mRightEdge.draw(canvas);
canvas.restoreToCount(restoreCount);
}
} else {
mLeftEdge.finish();
mRightEdge.finish();
}
if (needsInvalidate) {
// Keep animating
ViewCompat.postInvalidateOnAnimation(this);
}
|
| protected void | drawableStateChanged()
super.drawableStateChanged();
final Drawable d = mMarginDrawable;
if (d != null && d.isStateful()) {
d.setState(getDrawableState());
}
|
| private void | enableLayers(boolean enable)
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final int layerType = enable ?
ViewCompat.LAYER_TYPE_HARDWARE : ViewCompat.LAYER_TYPE_NONE;
ViewCompat.setLayerType(getChildAt(i), layerType, null);
}
|
| private void | endDrag()
mIsBeingDragged = false;
mIsUnableToDrag = false;
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
|
| public void | endFakeDrag()End a fake drag of the pager.
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(
velocityTracker, mActivePointerId);
mPopulatePending = true;
final int width = getClientWidth();
final int scrollX = getScrollX();
final ItemInfo ii = infoForCurrentScrollPosition();
final int currentPage = ii.position;
final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
final int totalDelta = (int) (mLastMotionX - mInitialMotionX);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
endDrag();
mFakeDragging = false;
|
| public boolean | executeKeyEvent(android.view.KeyEvent event)You can call this function yourself to have the scroll view perform
scrolling from a key event, just as if the event had been dispatched to
it by the view hierarchy.
boolean handled = false;
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_DPAD_LEFT:
handled = arrowScroll(FOCUS_LEFT);
break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
handled = arrowScroll(FOCUS_RIGHT);
break;
case KeyEvent.KEYCODE_TAB:
if (Build.VERSION.SDK_INT >= 11) {
// The focus finder had a bug handling FOCUS_FORWARD and FOCUS_BACKWARD
// before Android 3.0. Ignore the tab key on those devices.
if (KeyEventCompat.hasNoModifiers(event)) {
handled = arrowScroll(FOCUS_FORWARD);
} else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_SHIFT_ON)) {
handled = arrowScroll(FOCUS_BACKWARD);
}
}
break;
}
}
return handled;
|
| public void | fakeDragBy(float xOffset)Fake drag by an offset in pixels. You must have called {@link #beginFakeDrag()} first.
if (!mFakeDragging) {
throw new IllegalStateException("No fake drag in progress. Call beginFakeDrag first.");
}
mLastMotionX += xOffset;
float oldScrollX = getScrollX();
float scrollX = oldScrollX - xOffset;
final int width = getClientWidth();
float leftBound = width * mFirstOffset;
float rightBound = width * mLastOffset;
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
leftBound = firstItem.offset * width;
}
if (lastItem.position != mAdapter.getCount() - 1) {
rightBound = lastItem.offset * width;
}
if (scrollX < leftBound) {
scrollX = leftBound;
} else if (scrollX > rightBound) {
scrollX = rightBound;
}
// Don't lose the rounded component
mLastMotionX += scrollX - (int) scrollX;
scrollTo((int) scrollX, getScrollY());
pageScrolled((int) scrollX);
// Synthesize an event for the VelocityTracker.
final long time = SystemClock.uptimeMillis();
final MotionEvent ev = MotionEvent.obtain(mFakeDragBeginTime, time, MotionEvent.ACTION_MOVE,
mLastMotionX, 0, 0);
mVelocityTracker.addMovement(ev);
ev.recycle();
|
| protected ViewGroup.LayoutParams | generateDefaultLayoutParams()
return new LayoutParams();
|
| protected ViewGroup.LayoutParams | generateLayoutParams(ViewGroup.LayoutParams p)
return generateDefaultLayoutParams();
|
| public ViewGroup.LayoutParams | generateLayoutParams(android.util.AttributeSet attrs)
return new LayoutParams(getContext(), attrs);
|
| public PagerAdapter | getAdapter()Retrieve the current adapter supplying pages.
return mAdapter;
|
| protected int | getChildDrawingOrder(int childCount, int i)
final int index = mDrawingOrder == DRAW_ORDER_REVERSE ? childCount - 1 - i : i;
final int result = ((LayoutParams) mDrawingOrderedChildren.get(index).getLayoutParams()).childIndex;
return result;
|
| private android.graphics.Rect | getChildRectInPagerCoordinates(android.graphics.Rect outRect, android.view.View child)
if (outRect == null) {
outRect = new Rect();
}
if (child == null) {
outRect.set(0, 0, 0, 0);
return outRect;
}
outRect.left = child.getLeft();
outRect.right = child.getRight();
outRect.top = child.getTop();
outRect.bottom = child.getBottom();
ViewParent parent = child.getParent();
while (parent instanceof ViewGroup && parent != this) {
final ViewGroup group = (ViewGroup) parent;
outRect.left += group.getLeft();
outRect.right += group.getRight();
outRect.top += group.getTop();
outRect.bottom += group.getBottom();
parent = group.getParent();
}
return outRect;
|
| private int | getClientWidth()
return getMeasuredWidth() - getPaddingLeft() - getPaddingRight();
|
| public int | getCurrentItem()
return mCurItem;
|
| public int | getOffscreenPageLimit()Returns the number of pages that will be retained to either side of the
current page in the view hierarchy in an idle state. Defaults to 1.
return mOffscreenPageLimit;
|
| public int | getPageMargin()Return the margin between pages.
return mPageMargin;
|
| android.support.v4.view.ViewPager$ItemInfo | infoForAnyChild(android.view.View child)
ViewParent parent;
while ((parent=child.getParent()) != this) {
if (parent == null || !(parent instanceof View)) {
return null;
}
child = (View)parent;
}
return infoForChild(child);
|
| android.support.v4.view.ViewPager$ItemInfo | infoForChild(android.view.View child)
for (int i=0; i<mItems.size(); i++) {
ItemInfo ii = mItems.get(i);
if (mAdapter.isViewFromObject(child, ii.object)) {
return ii;
}
}
return null;
|
| private android.support.v4.view.ViewPager$ItemInfo | infoForCurrentScrollPosition()
final int width = getClientWidth();
final float scrollOffset = width > 0 ? (float) getScrollX() / width : 0;
final float marginOffset = width > 0 ? (float) mPageMargin / width : 0;
int lastPos = -1;
float lastOffset = 0.f;
float lastWidth = 0.f;
boolean first = true;
ItemInfo lastItem = null;
for (int i = 0; i < mItems.size(); i++) {
ItemInfo ii = mItems.get(i);
float offset;
if (!first && ii.position != lastPos + 1) {
// Create a synthetic item for a missing page.
ii = mTempItem;
ii.offset = lastOffset + lastWidth + marginOffset;
ii.position = lastPos + 1;
ii.widthFactor = mAdapter.getPageWidth(ii.position);
i--;
}
offset = ii.offset;
final float leftBound = offset;
final float rightBound = offset + ii.widthFactor + marginOffset;
if (first || scrollOffset >= leftBound) {
if (scrollOffset < rightBound || i == mItems.size() - 1) {
return ii;
}
} else {
return lastItem;
}
first = false;
lastPos = ii.position;
lastOffset = offset;
lastWidth = ii.widthFactor;
lastItem = ii;
}
return lastItem;
|
| android.support.v4.view.ViewPager$ItemInfo | infoForPosition(int position)
for (int i = 0; i < mItems.size(); i++) {
ItemInfo ii = mItems.get(i);
if (ii.position == position) {
return ii;
}
}
return null;
|
| void | initViewPager()
setWillNotDraw(false);
setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
setFocusable(true);
final Context context = getContext();
mScroller = new Scroller(context, sInterpolator);
final ViewConfiguration configuration = ViewConfiguration.get(context);
final float density = context.getResources().getDisplayMetrics().density;
mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
mMinimumVelocity = (int) (MIN_FLING_VELOCITY * density);
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
mLeftEdge = new EdgeEffectCompat(context);
mRightEdge = new EdgeEffectCompat(context);
mFlingDistance = (int) (MIN_DISTANCE_FOR_FLING * density);
mCloseEnough = (int) (CLOSE_ENOUGH * density);
mDefaultGutterSize = (int) (DEFAULT_GUTTER_SIZE * density);
ViewCompat.setAccessibilityDelegate(this, new MyAccessibilityDelegate());
if (ViewCompat.getImportantForAccessibility(this)
== ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
ViewCompat.setImportantForAccessibility(this,
ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
}
|
| public boolean | isFakeDragging()Returns true if a fake drag is in progress.
return mFakeDragging;
|
| private boolean | isGutterDrag(float x, float dx)
return (x < mGutterSize && dx > 0) || (x > getWidth() - mGutterSize && dx < 0);
|
| protected void | onAttachedToWindow()
super.onAttachedToWindow();
mFirstLayout = true;
|
| protected void | onDetachedFromWindow()
removeCallbacks(mEndScrollRunnable);
super.onDetachedFromWindow();
|
| protected void | onDraw(android.graphics.Canvas canvas)
super.onDraw(canvas);
// Draw the margin drawable between pages if needed.
if (mPageMargin > 0 && mMarginDrawable != null && mItems.size() > 0 && mAdapter != null) {
final int scrollX = getScrollX();
final int width = getWidth();
final float marginOffset = (float) mPageMargin / width;
int itemIndex = 0;
ItemInfo ii = mItems.get(0);
float offset = ii.offset;
final int itemCount = mItems.size();
final int firstPos = ii.position;
final int lastPos = mItems.get(itemCount - 1).position;
for (int pos = firstPos; pos < lastPos; pos++) {
while (pos > ii.position && itemIndex < itemCount) {
ii = mItems.get(++itemIndex);
}
float drawAt;
if (pos == ii.position) {
drawAt = (ii.offset + ii.widthFactor) * width;
offset = ii.offset + ii.widthFactor + marginOffset;
} else {
float widthFactor = mAdapter.getPageWidth(pos);
drawAt = (offset + widthFactor) * width;
offset += widthFactor + marginOffset;
}
if (drawAt + mPageMargin > scrollX) {
mMarginDrawable.setBounds((int) drawAt, mTopPageBounds,
(int) (drawAt + mPageMargin + 0.5f), mBottomPageBounds);
mMarginDrawable.draw(canvas);
}
if (drawAt > scrollX + width) {
break; // No more visible, no sense in continuing
}
}
}
|
| public boolean | onInterceptTouchEvent(android.view.MotionEvent ev)
/*
* This method JUST determines whether we want to intercept the motion.
* If we return true, onMotionEvent will be called and we do the actual
* scrolling there.
*/
final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
// Always take care of the touch gesture being complete.
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
// Release the drag.
if (DEBUG) Log.v(TAG, "Intercept done!");
mIsBeingDragged = false;
mIsUnableToDrag = false;
mActivePointerId = INVALID_POINTER;
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
return false;
}
// Nothing more to do here if we have decided whether or not we
// are dragging.
if (action != MotionEvent.ACTION_DOWN) {
if (mIsBeingDragged) {
if (DEBUG) Log.v(TAG, "Intercept returning true!");
return true;
}
if (mIsUnableToDrag) {
if (DEBUG) Log.v(TAG, "Intercept returning false!");
return false;
}
}
switch (action) {
case MotionEvent.ACTION_MOVE: {
/*
* mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
* whether the user has moved far enough from his original down touch.
*/
/*
* Locally do absolute value. mLastMotionY is set to the y value
* of the down event.
*/
final int activePointerId = mActivePointerId;
if (activePointerId == INVALID_POINTER) {
// If we don't have a valid id, the touch down wasn't on content.
break;
}
final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId);
final float x = MotionEventCompat.getX(ev, pointerIndex);
final float dx = x - mLastMotionX;
final float xDiff = Math.abs(dx);
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float yDiff = Math.abs(y - mInitialMotionY);
if (DEBUG) Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
if (dx != 0 && !isGutterDrag(mLastMotionX, dx) &&
canScroll(this, false, (int) dx, (int) x, (int) y)) {
// Nested view has scrollable area under this point. Let it be handled there.
mLastMotionX = x;
mLastMotionY = y;
mIsUnableToDrag = true;
return false;
}
if (xDiff > mTouchSlop && xDiff * 0.5f > yDiff) {
if (DEBUG) Log.v(TAG, "Starting drag!");
mIsBeingDragged = true;
requestParentDisallowInterceptTouchEvent(true);
setScrollState(SCROLL_STATE_DRAGGING);
mLastMotionX = dx > 0 ? mInitialMotionX + mTouchSlop :
mInitialMotionX - mTouchSlop;
mLastMotionY = y;
setScrollingCacheEnabled(true);
} else if (yDiff > mTouchSlop) {
// The finger has moved enough in the vertical
// direction to be counted as a drag... abort
// any attempt to drag horizontally, to work correctly
// with children that have scrolling containers.
if (DEBUG) Log.v(TAG, "Starting unable to drag!");
mIsUnableToDrag = true;
}
if (mIsBeingDragged) {
// Scroll to follow the motion event
if (performDrag(x)) {
ViewCompat.postInvalidateOnAnimation(this);
}
}
break;
}
case MotionEvent.ACTION_DOWN: {
/*
* Remember location of down touch.
* ACTION_DOWN always refers to pointer index 0.
*/
mLastMotionX = mInitialMotionX = ev.getX();
mLastMotionY = mInitialMotionY = ev.getY();
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
mIsUnableToDrag = false;
mScroller.computeScrollOffset();
if (mScrollState == SCROLL_STATE_SETTLING &&
Math.abs(mScroller.getFinalX() - mScroller.getCurrX()) > mCloseEnough) {
// Let the user 'catch' the pager as it animates.
mScroller.abortAnimation();
mPopulatePending = false;
populate();
mIsBeingDragged = true;
requestParentDisallowInterceptTouchEvent(true);
setScrollState(SCROLL_STATE_DRAGGING);
} else {
completeScroll(false);
mIsBeingDragged = false;
}
if (DEBUG) Log.v(TAG, "Down at " + mLastMotionX + "," + mLastMotionY
+ " mIsBeingDragged=" + mIsBeingDragged
+ "mIsUnableToDrag=" + mIsUnableToDrag);
break;
}
case MotionEventCompat.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
break;
}
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
/*
* The only time we want to intercept motion events is if we are in the
* drag mode.
*/
return mIsBeingDragged;
|
| protected void | onLayout(boolean changed, int l, int t, int r, int b)
final int count = getChildCount();
int width = r - l;
int height = b - t;
int paddingLeft = getPaddingLeft();
int paddingTop = getPaddingTop();
int paddingRight = getPaddingRight();
int paddingBottom = getPaddingBottom();
final int scrollX = getScrollX();
int decorCount = 0;
// First pass - decor views. We need to do this in two passes so that
// we have the proper offsets for non-decor views later.
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
int childLeft = 0;
int childTop = 0;
if (lp.isDecor) {
final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
switch (hgrav) {
default:
childLeft = paddingLeft;
break;
case Gravity.LEFT:
childLeft = paddingLeft;
paddingLeft += child.getMeasuredWidth();
break;
case Gravity.CENTER_HORIZONTAL:
childLeft = Math.max((width - child.getMeasuredWidth()) / 2,
paddingLeft);
break;
case Gravity.RIGHT:
childLeft = width - paddingRight - child.getMeasuredWidth();
paddingRight += child.getMeasuredWidth();
break;
}
switch (vgrav) {
default:
childTop = paddingTop;
break;
case Gravity.TOP:
childTop = paddingTop;
paddingTop += child.getMeasuredHeight();
break;
case Gravity.CENTER_VERTICAL:
childTop = Math.max((height - child.getMeasuredHeight()) / 2,
paddingTop);
break;
case Gravity.BOTTOM:
childTop = height - paddingBottom - child.getMeasuredHeight();
paddingBottom += child.getMeasuredHeight();
break;
}
childLeft += scrollX;
child.layout(childLeft, childTop,
childLeft + child.getMeasuredWidth(),
childTop + child.getMeasuredHeight());
decorCount++;
}
}
}
final int childWidth = width - paddingLeft - paddingRight;
// Page views. Do this once we have the right padding offsets from above.
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
ItemInfo ii;
if (!lp.isDecor && (ii = infoForChild(child)) != null) {
int loff = (int) (childWidth * ii.offset);
int childLeft = paddingLeft + loff;
int childTop = paddingTop;
if (lp.needsMeasure) {
// This was added during layout and needs measurement.
// Do it now that we know what we're working with.
lp.needsMeasure = false;
final int widthSpec = MeasureSpec.makeMeasureSpec(
(int) (childWidth * lp.widthFactor),
MeasureSpec.EXACTLY);
final int heightSpec = MeasureSpec.makeMeasureSpec(
(int) (height - paddingTop - paddingBottom),
MeasureSpec.EXACTLY);
child.measure(widthSpec, heightSpec);
}
if (DEBUG) Log.v(TAG, "Positioning #" + i + " " + child + " f=" + ii.object
+ ":" + childLeft + "," + childTop + " " + child.getMeasuredWidth()
+ "x" + child.getMeasuredHeight());
child.layout(childLeft, childTop,
childLeft + child.getMeasuredWidth(),
childTop + child.getMeasuredHeight());
}
}
}
mTopPageBounds = paddingTop;
mBottomPageBounds = height - paddingBottom;
mDecorChildCount = decorCount;
if (mFirstLayout) {
scrollToItem(mCurItem, false, 0, false);
}
mFirstLayout = false;
|
| protected void | onMeasure(int widthMeasureSpec, int heightMeasureSpec)
// For simple implementation, our internal size is always 0.
// We depend on the container to specify the layout size of
// our view. We can't really know what it is since we will be
// adding and removing different arbitrary views and do not
// want the layout to change as this happens.
setMeasuredDimension(getDefaultSize(0, widthMeasureSpec),
getDefaultSize(0, heightMeasureSpec));
final int measuredWidth = getMeasuredWidth();
final int maxGutterSize = measuredWidth / 10;
mGutterSize = Math.min(maxGutterSize, mDefaultGutterSize);
// Children are just made to fill our space.
int childWidthSize = measuredWidth - getPaddingLeft() - getPaddingRight();
int childHeightSize = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
/*
* Make sure all children have been properly measured. Decor views first.
* Right now we cheat and make this less complicated by assuming decor
* views won't intersect. We will pin to edges based on gravity.
*/
int size = getChildCount();
for (int i = 0; i < size; ++i) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp != null && lp.isDecor) {
final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
final int vgrav = lp.gravity & Gravity.VERTICAL_GRAVITY_MASK;
int widthMode = MeasureSpec.AT_MOST;
int heightMode = MeasureSpec.AT_MOST;
boolean consumeVertical = vgrav == Gravity.TOP || vgrav == Gravity.BOTTOM;
boolean consumeHorizontal = hgrav == Gravity.LEFT || hgrav == Gravity.RIGHT;
if (consumeVertical) {
widthMode = MeasureSpec.EXACTLY;
} else if (consumeHorizontal) {
heightMode = MeasureSpec.EXACTLY;
}
int widthSize = childWidthSize;
int heightSize = childHeightSize;
if (lp.width != LayoutParams.WRAP_CONTENT) {
widthMode = MeasureSpec.EXACTLY;
if (lp.width != LayoutParams.FILL_PARENT) {
widthSize = lp.width;
}
}
if (lp.height != LayoutParams.WRAP_CONTENT) {
heightMode = MeasureSpec.EXACTLY;
if (lp.height != LayoutParams.FILL_PARENT) {
heightSize = lp.height;
}
}
final int widthSpec = MeasureSpec.makeMeasureSpec(widthSize, widthMode);
final int heightSpec = MeasureSpec.makeMeasureSpec(heightSize, heightMode);
child.measure(widthSpec, heightSpec);
if (consumeVertical) {
childHeightSize -= child.getMeasuredHeight();
} else if (consumeHorizontal) {
childWidthSize -= child.getMeasuredWidth();
}
}
}
}
mChildWidthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
mChildHeightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeightSize, MeasureSpec.EXACTLY);
// Make sure we have created all fragments that we need to have shown.
mInLayout = true;
populate();
mInLayout = false;
// Page views next.
size = getChildCount();
for (int i = 0; i < size; ++i) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
if (DEBUG) Log.v(TAG, "Measuring #" + i + " " + child
+ ": " + mChildWidthMeasureSpec);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp == null || !lp.isDecor) {
final int widthSpec = MeasureSpec.makeMeasureSpec(
(int) (childWidthSize * lp.widthFactor), MeasureSpec.EXACTLY);
child.measure(widthSpec, mChildHeightMeasureSpec);
}
}
}
|
| protected void | onPageScrolled(int position, float offset, int offsetPixels)This method will be invoked when the current page is scrolled, either as part
of a programmatically initiated smooth scroll or a user initiated touch scroll.
If you override this method you must call through to the superclass implementation
(e.g. super.onPageScrolled(position, offset, offsetPixels)) before onPageScrolled
returns.
// Offset any decor views if needed - keep them on-screen at all times.
if (mDecorChildCount > 0) {
final int scrollX = getScrollX();
int paddingLeft = getPaddingLeft();
int paddingRight = getPaddingRight();
final int width = getWidth();
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (!lp.isDecor) continue;
final int hgrav = lp.gravity & Gravity.HORIZONTAL_GRAVITY_MASK;
int childLeft = 0;
switch (hgrav) {
default:
childLeft = paddingLeft;
break;
case Gravity.LEFT:
childLeft = paddingLeft;
paddingLeft += child.getWidth();
break;
case Gravity.CENTER_HORIZONTAL:
childLeft = Math.max((width - child.getMeasuredWidth()) / 2,
paddingLeft);
break;
case Gravity.RIGHT:
childLeft = width - paddingRight - child.getMeasuredWidth();
paddingRight += child.getMeasuredWidth();
break;
}
childLeft += scrollX;
final int childOffset = childLeft - child.getLeft();
if (childOffset != 0) {
child.offsetLeftAndRight(childOffset);
}
}
}
if (mOnPageChangeListener != null) {
mOnPageChangeListener.onPageScrolled(position, offset, offsetPixels);
}
if (mInternalPageChangeListener != null) {
mInternalPageChangeListener.onPageScrolled(position, offset, offsetPixels);
}
if (mPageTransformer != null) {
final int scrollX = getScrollX();
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp.isDecor) continue;
final float transformPos = (float) (child.getLeft() - scrollX) / getClientWidth();
mPageTransformer.transformPage(child, transformPos);
}
}
mCalledSuper = true;
|
| protected boolean | onRequestFocusInDescendants(int direction, android.graphics.Rect previouslyFocusedRect)We only want the current page that is being shown to be focusable.
int index;
int increment;
int end;
int count = getChildCount();
if ((direction & FOCUS_FORWARD) != 0) {
index = 0;
increment = 1;
end = count;
} else {
index = count - 1;
increment = -1;
end = -1;
}
for (int i = index; i != end; i += increment) {
View child = getChildAt(i);
if (child.getVisibility() == VISIBLE) {
ItemInfo ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
if (child.requestFocus(direction, previouslyFocusedRect)) {
return true;
}
}
}
}
return false;
|
| public void | onRestoreInstanceState(android.os.Parcelable state)
if (!(state instanceof SavedState)) {
super.onRestoreInstanceState(state);
return;
}
SavedState ss = (SavedState)state;
super.onRestoreInstanceState(ss.getSuperState());
if (mAdapter != null) {
mAdapter.restoreState(ss.adapterState, ss.loader);
setCurrentItemInternal(ss.position, false, true);
} else {
mRestoredCurItem = ss.position;
mRestoredAdapterState = ss.adapterState;
mRestoredClassLoader = ss.loader;
}
|
| public android.os.Parcelable | onSaveInstanceState()
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.position = mCurItem;
if (mAdapter != null) {
ss.adapterState = mAdapter.saveState();
}
return ss;
|
| private void | onSecondaryPointerUp(android.view.MotionEvent ev)
final int pointerIndex = MotionEventCompat.getActionIndex(ev);
final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX = MotionEventCompat.getX(ev, newPointerIndex);
mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
if (mVelocityTracker != null) {
mVelocityTracker.clear();
}
}
|
| protected void | onSizeChanged(int w, int h, int oldw, int oldh)
super.onSizeChanged(w, h, oldw, oldh);
// Make sure scroll position is set correctly.
if (w != oldw) {
recomputeScrollPosition(w, oldw, mPageMargin, mPageMargin);
}
|
| public boolean | onTouchEvent(android.view.MotionEvent ev)
if (mFakeDragging) {
// A fake drag is in progress already, ignore this real one
// but still eat the touch events.
// (It is likely that the user is multi-touching the screen.)
return true;
}
if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) {
// Don't handle edge touches immediately -- they may actually belong to one of our
// descendants.
return false;
}
if (mAdapter == null || mAdapter.getCount() == 0) {
// Nothing to present or scroll; nothing to touch.
return false;
}
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(ev);
final int action = ev.getAction();
boolean needsInvalidate = false;
switch (action & MotionEventCompat.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
mScroller.abortAnimation();
mPopulatePending = false;
populate();
// Remember where the motion event started
mLastMotionX = mInitialMotionX = ev.getX();
mLastMotionY = mInitialMotionY = ev.getY();
mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
break;
}
case MotionEvent.ACTION_MOVE:
if (!mIsBeingDragged) {
final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
final float x = MotionEventCompat.getX(ev, pointerIndex);
final float xDiff = Math.abs(x - mLastMotionX);
final float y = MotionEventCompat.getY(ev, pointerIndex);
final float yDiff = Math.abs(y - mLastMotionY);
if (DEBUG) Log.v(TAG, "Moved x to " + x + "," + y + " diff=" + xDiff + "," + yDiff);
if (xDiff > mTouchSlop && xDiff > yDiff) {
if (DEBUG) Log.v(TAG, "Starting drag!");
mIsBeingDragged = true;
requestParentDisallowInterceptTouchEvent(true);
mLastMotionX = x - mInitialMotionX > 0 ? mInitialMotionX + mTouchSlop :
mInitialMotionX - mTouchSlop;
mLastMotionY = y;
setScrollState(SCROLL_STATE_DRAGGING);
setScrollingCacheEnabled(true);
// Disallow Parent Intercept, just in case
ViewParent parent = getParent();
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
}
}
// Not else! Note that mIsBeingDragged can be set above.
if (mIsBeingDragged) {
// Scroll to follow the motion event
final int activePointerIndex = MotionEventCompat.findPointerIndex(
ev, mActivePointerId);
final float x = MotionEventCompat.getX(ev, activePointerIndex);
needsInvalidate |= performDrag(x);
}
break;
case MotionEvent.ACTION_UP:
if (mIsBeingDragged) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
int initialVelocity = (int) VelocityTrackerCompat.getXVelocity(
velocityTracker, mActivePointerId);
mPopulatePending = true;
final int width = getClientWidth();
final int scrollX = getScrollX();
final ItemInfo ii = infoForCurrentScrollPosition();
final int currentPage = ii.position;
final float pageOffset = (((float) scrollX / width) - ii.offset) / ii.widthFactor;
final int activePointerIndex =
MotionEventCompat.findPointerIndex(ev, mActivePointerId);
final float x = MotionEventCompat.getX(ev, activePointerIndex);
final int totalDelta = (int) (x - mInitialMotionX);
int nextPage = determineTargetPage(currentPage, pageOffset, initialVelocity,
totalDelta);
setCurrentItemInternal(nextPage, true, true, initialVelocity);
mActivePointerId = INVALID_POINTER;
endDrag();
needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
}
break;
case MotionEvent.ACTION_CANCEL:
if (mIsBeingDragged) {
scrollToItem(mCurItem, true, 0, false);
mActivePointerId = INVALID_POINTER;
endDrag();
needsInvalidate = mLeftEdge.onRelease() | mRightEdge.onRelease();
}
break;
case MotionEventCompat.ACTION_POINTER_DOWN: {
final int index = MotionEventCompat.getActionIndex(ev);
final float x = MotionEventCompat.getX(ev, index);
mLastMotionX = x;
mActivePointerId = MotionEventCompat.getPointerId(ev, index);
break;
}
case MotionEventCompat.ACTION_POINTER_UP:
onSecondaryPointerUp(ev);
mLastMotionX = MotionEventCompat.getX(ev,
MotionEventCompat.findPointerIndex(ev, mActivePointerId));
break;
}
if (needsInvalidate) {
ViewCompat.postInvalidateOnAnimation(this);
}
return true;
|
| boolean | pageLeft()
if (mCurItem > 0) {
setCurrentItem(mCurItem-1, true);
return true;
}
return false;
|
| boolean | pageRight()
if (mAdapter != null && mCurItem < (mAdapter.getCount()-1)) {
setCurrentItem(mCurItem+1, true);
return true;
}
return false;
|
| private boolean | pageScrolled(int xpos)
if (mItems.size() == 0) {
mCalledSuper = false;
onPageScrolled(0, 0, 0);
if (!mCalledSuper) {
throw new IllegalStateException(
"onPageScrolled did not call superclass implementation");
}
return false;
}
final ItemInfo ii = infoForCurrentScrollPosition();
final int width = getClientWidth();
final int widthWithMargin = width + mPageMargin;
final float marginOffset = (float) mPageMargin / width;
final int currentPage = ii.position;
final float pageOffset = (((float) xpos / width) - ii.offset) /
(ii.widthFactor + marginOffset);
final int offsetPixels = (int) (pageOffset * widthWithMargin);
mCalledSuper = false;
onPageScrolled(currentPage, pageOffset, offsetPixels);
if (!mCalledSuper) {
throw new IllegalStateException(
"onPageScrolled did not call superclass implementation");
}
return true;
|
| private boolean | performDrag(float x)
boolean needsInvalidate = false;
final float deltaX = mLastMotionX - x;
mLastMotionX = x;
float oldScrollX = getScrollX();
float scrollX = oldScrollX + deltaX;
final int width = getClientWidth();
float leftBound = width * mFirstOffset;
float rightBound = width * mLastOffset;
boolean leftAbsolute = true;
boolean rightAbsolute = true;
final ItemInfo firstItem = mItems.get(0);
final ItemInfo lastItem = mItems.get(mItems.size() - 1);
if (firstItem.position != 0) {
leftAbsolute = false;
leftBound = firstItem.offset * width;
}
if (lastItem.position != mAdapter.getCount() - 1) {
rightAbsolute = false;
rightBound = lastItem.offset * width;
}
if (scrollX < leftBound) {
if (leftAbsolute) {
float over = leftBound - scrollX;
needsInvalidate = mLeftEdge.onPull(Math.abs(over) / width);
}
scrollX = leftBound;
} else if (scrollX > rightBound) {
if (rightAbsolute) {
float over = scrollX - rightBound;
needsInvalidate = mRightEdge.onPull(Math.abs(over) / width);
}
scrollX = rightBound;
}
// Don't lose the rounded component
mLastMotionX += scrollX - (int) scrollX;
scrollTo((int) scrollX, getScrollY());
pageScrolled((int) scrollX);
return needsInvalidate;
|
| void | populate()
populate(mCurItem);
|
| void | populate(int newCurrentItem)
ItemInfo oldCurInfo = null;
int focusDirection = View.FOCUS_FORWARD;
if (mCurItem != newCurrentItem) {
focusDirection = mCurItem < newCurrentItem ? View.FOCUS_RIGHT : View.FOCUS_LEFT;
oldCurInfo = infoForPosition(mCurItem);
mCurItem = newCurrentItem;
}
if (mAdapter == null) {
sortChildDrawingOrder();
return;
}
// Bail now if we are waiting to populate. This is to hold off
// on creating views from the time the user releases their finger to
// fling to a new position until we have finished the scroll to
// that position, avoiding glitches from happening at that point.
if (mPopulatePending) {
if (DEBUG) Log.i(TAG, "populate is pending, skipping for now...");
sortChildDrawingOrder();
return;
}
// Also, don't populate until we are attached to a window. This is to
// avoid trying to populate before we have restored our view hierarchy
// state and conflicting with what is restored.
if (getWindowToken() == null) {
return;
}
mAdapter.startUpdate(this);
final int pageLimit = mOffscreenPageLimit;
final int startPos = Math.max(0, mCurItem - pageLimit);
final int N = mAdapter.getCount();
final int endPos = Math.min(N-1, mCurItem + pageLimit);
if (N != mExpectedAdapterCount) {
String resName;
try {
resName = getResources().getResourceName(getId());
} catch (Resources.NotFoundException e) {
resName = Integer.toHexString(getId());
}
throw new IllegalStateException("The application's PagerAdapter changed the adapter's" +
" contents without calling PagerAdapter#notifyDataSetChanged!" +
" Expected adapter item count: " + mExpectedAdapterCount + ", found: " + N +
" Pager id: " + resName +
" Pager class: " + getClass() +
" Problematic adapter: " + mAdapter.getClass());
}
// Locate the currently focused item or add it if needed.
int curIndex = -1;
ItemInfo curItem = null;
for (curIndex = 0; curIndex < mItems.size(); curIndex++) {
final ItemInfo ii = mItems.get(curIndex);
if (ii.position >= mCurItem) {
if (ii.position == mCurItem) curItem = ii;
break;
}
}
if (curItem == null && N > 0) {
curItem = addNewItem(mCurItem, curIndex);
}
// Fill 3x the available width or up to the number of offscreen
// pages requested to either side, whichever is larger.
// If we have no current item we have no work to do.
if (curItem != null) {
float extraWidthLeft = 0.f;
int itemIndex = curIndex - 1;
ItemInfo ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
final int clientWidth = getClientWidth();
final float leftWidthNeeded = clientWidth <= 0 ? 0 :
2.f - curItem.widthFactor + (float) getPaddingLeft() / (float) clientWidth;
for (int pos = mCurItem - 1; pos >= 0; pos--) {
if (extraWidthLeft >= leftWidthNeeded && pos < startPos) {
if (ii == null) {
break;
}
if (pos == ii.position && !ii.scrolling) {
mItems.remove(itemIndex);
mAdapter.destroyItem(this, pos, ii.object);
if (DEBUG) {
Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
" view: " + ((View) ii.object));
}
itemIndex--;
curIndex--;
ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
}
} else if (ii != null && pos == ii.position) {
extraWidthLeft += ii.widthFactor;
itemIndex--;
ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
} else {
ii = addNewItem(pos, itemIndex + 1);
extraWidthLeft += ii.widthFactor;
curIndex++;
ii = itemIndex >= 0 ? mItems.get(itemIndex) : null;
}
}
float extraWidthRight = curItem.widthFactor;
itemIndex = curIndex + 1;
if (extraWidthRight < 2.f) {
ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
final float rightWidthNeeded = clientWidth <= 0 ? 0 :
(float) getPaddingRight() / (float) clientWidth + 2.f;
for (int pos = mCurItem + 1; pos < N; pos++) {
if (extraWidthRight >= rightWidthNeeded && pos > endPos) {
if (ii == null) {
break;
}
if (pos == ii.position && !ii.scrolling) {
mItems.remove(itemIndex);
mAdapter.destroyItem(this, pos, ii.object);
if (DEBUG) {
Log.i(TAG, "populate() - destroyItem() with pos: " + pos +
" view: " + ((View) ii.object));
}
ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
}
} else if (ii != null && pos == ii.position) {
extraWidthRight += ii.widthFactor;
itemIndex++;
ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
} else {
ii = addNewItem(pos, itemIndex);
itemIndex++;
extraWidthRight += ii.widthFactor;
ii = itemIndex < mItems.size() ? mItems.get(itemIndex) : null;
}
}
}
calculatePageOffsets(curItem, curIndex, oldCurInfo);
}
if (DEBUG) {
Log.i(TAG, "Current page list:");
for (int i=0; i<mItems.size(); i++) {
Log.i(TAG, "#" + i + ": page " + mItems.get(i).position);
}
}
mAdapter.setPrimaryItem(this, mCurItem, curItem != null ? curItem.object : null);
mAdapter.finishUpdate(this);
// Check width measurement of current pages and drawing sort order.
// Update LayoutParams as needed.
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
lp.childIndex = i;
if (!lp.isDecor && lp.widthFactor == 0.f) {
// 0 means requery the adapter for this, it doesn't have a valid width.
final ItemInfo ii = infoForChild(child);
if (ii != null) {
lp.widthFactor = ii.widthFactor;
lp.position = ii.position;
}
}
}
sortChildDrawingOrder();
if (hasFocus()) {
View currentFocused = findFocus();
ItemInfo ii = currentFocused != null ? infoForAnyChild(currentFocused) : null;
if (ii == null || ii.position != mCurItem) {
for (int i=0; i<getChildCount(); i++) {
View child = getChildAt(i);
ii = infoForChild(child);
if (ii != null && ii.position == mCurItem) {
if (child.requestFocus(focusDirection)) {
break;
}
}
}
}
}
|
| private void | recomputeScrollPosition(int width, int oldWidth, int margin, int oldMargin)
if (oldWidth > 0 && !mItems.isEmpty()) {
final int widthWithMargin = width - getPaddingLeft() - getPaddingRight() + margin;
final int oldWidthWithMargin = oldWidth - getPaddingLeft() - getPaddingRight()
+ oldMargin;
final int xpos = getScrollX();
final float pageOffset = (float) xpos / oldWidthWithMargin;
final int newOffsetPixels = (int) (pageOffset * widthWithMargin);
scrollTo(newOffsetPixels, getScrollY());
if (!mScroller.isFinished()) {
// We now return to your regularly scheduled scroll, already in progress.
final int newDuration = mScroller.getDuration() - mScroller.timePassed();
ItemInfo targetInfo = infoForPosition(mCurItem);
mScroller.startScroll(newOffsetPixels, 0,
(int) (targetInfo.offset * width), 0, newDuration);
}
} else {
final ItemInfo ii = infoForPosition(mCurItem);
final float scrollOffset = ii != null ? Math.min(ii.offset, mLastOffset) : 0;
final int scrollPos = (int) (scrollOffset *
(width - getPaddingLeft() - getPaddingRight()));
if (scrollPos != getScrollX()) {
completeScroll(false);
scrollTo(scrollPos, getScrollY());
}
}
|
| private void | removeNonDecorViews()
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (!lp.isDecor) {
removeViewAt(i);
i--;
}
}
|
| public void | removeView(android.view.View view)
if (mInLayout) {
removeViewInLayout(view);
} else {
super.removeView(view);
}
|
| private void | requestParentDisallowInterceptTouchEvent(boolean disallowIntercept)
final ViewParent parent = getParent();
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(disallowIntercept);
}
|
| private void | scrollToItem(int item, boolean smoothScroll, int velocity, boolean dispatchSelected)
final ItemInfo curInfo = infoForPosition(item);
int destX = 0;
if (curInfo != null) {
final int width = getClientWidth();
destX = (int) (width * Math.max(mFirstOffset,
Math.min(curInfo.offset, mLastOffset)));
}
if (smoothScroll) {
smoothScrollTo(destX, 0, velocity);
if (dispatchSelected && mOnPageChangeListener != null) {
mOnPageChangeListener.onPageSelected(item);
}
if (dispatchSelected && mInternalPageChangeListener != null) {
mInternalPageChangeListener.onPageSelected(item);
}
} else {
if (dispatchSelected && mOnPageChangeListener != null) {
mOnPageChangeListener.onPageSelected(item);
}
if (dispatchSelected && mInternalPageChangeListener != null) {
mInternalPageChangeListener.onPageSelected(item);
}
completeScroll(false);
scrollTo(destX, 0);
pageScrolled(destX);
}
|
| public void | setAdapter(PagerAdapter adapter)Set a PagerAdapter that will supply views for this pager as needed.
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(mObserver);
mAdapter.startUpdate(this);
for (int i = 0; i < mItems.size(); i++) {
final ItemInfo ii = mItems.get(i);
mAdapter.destroyItem(this, ii.position, ii.object);
}
mAdapter.finishUpdate(this);
mItems.clear();
removeNonDecorViews();
mCurItem = 0;
scrollTo(0, 0);
}
final PagerAdapter oldAdapter = mAdapter;
mAdapter = adapter;
mExpectedAdapterCount = 0;
if (mAdapter != null) {
if (mObserver == null) {
mObserver = new PagerObserver();
}
mAdapter.registerDataSetObserver(mObserver);
mPopulatePending = false;
final boolean wasFirstLayout = mFirstLayout;
mFirstLayout = true;
mExpectedAdapterCount = mAdapter.getCount();
if (mRestoredCurItem >= 0) {
mAdapter.restoreState(mRestoredAdapterState, mRestoredClassLoader);
setCurrentItemInternal(mRestoredCurItem, false, true);
mRestoredCurItem = -1;
mRestoredAdapterState = null;
mRestoredClassLoader = null;
} else if (!wasFirstLayout) {
populate();
} else {
requestLayout();
}
}
if (mAdapterChangeListener != null && oldAdapter != adapter) {
mAdapterChangeListener.onAdapterChanged(oldAdapter, adapter);
}
|
| void | setChildrenDrawingOrderEnabledCompat(boolean enable)
if (Build.VERSION.SDK_INT >= 7) {
if (mSetChildrenDrawingOrderEnabled == null) {
try {
mSetChildrenDrawingOrderEnabled = ViewGroup.class.getDeclaredMethod(
"setChildrenDrawingOrderEnabled", new Class[] { Boolean.TYPE });
} catch (NoSuchMethodException e) {
Log.e(TAG, "Can't find setChildrenDrawingOrderEnabled", e);
}
}
try {
mSetChildrenDrawingOrderEnabled.invoke(this, enable);
} catch (Exception e) {
Log.e(TAG, "Error changing children drawing order", e);
}
}
|
| public void | setCurrentItem(int item)Set the currently selected page. If the ViewPager has already been through its first
layout with its current adapter there will be a smooth animated transition between
the current item and the specified item.
mPopulatePending = false;
setCurrentItemInternal(item, !mFirstLayout, false);
|
| public void | setCurrentItem(int item, boolean smoothScroll)Set the currently selected page.
mPopulatePending = false;
setCurrentItemInternal(item, smoothScroll, false);
|
| void | setCurrentItemInternal(int item, boolean smoothScroll, boolean always)
setCurrentItemInternal(item, smoothScroll, always, 0);
|
| void | setCurrentItemInternal(int item, boolean smoothScroll, boolean always, int velocity)
if (mAdapter == null || mAdapter.getCount() <= 0) {
setScrollingCacheEnabled(false);
return;
}
if (!always && mCurItem == item && mItems.size() != 0) {
setScrollingCacheEnabled(false);
return;
}
if (item < 0) {
item = 0;
} else if (item >= mAdapter.getCount()) {
item = mAdapter.getCount() - 1;
}
final int pageLimit = mOffscreenPageLimit;
if (item > (mCurItem + pageLimit) || item < (mCurItem - pageLimit)) {
// We are doing a jump by more than one page. To avoid
// glitches, we want to keep all current pages in the view
// until the scroll ends.
for (int i=0; i<mItems.size(); i++) {
mItems.get(i).scrolling = true;
}
}
final boolean dispatchSelected = mCurItem != item;
if (mFirstLayout) {
// We don't have any idea how big we are yet and shouldn't have any pages either.
// Just set things up and let the pending layout handle things.
mCurItem = item;
if (dispatchSelected && mOnPageChangeListener != null) {
mOnPageChangeListener.onPageSelected(item);
}
if (dispatchSelected && mInternalPageChangeListener != null) {
mInternalPageChangeListener.onPageSelected(item);
}
requestLayout();
} else {
populate(item);
scrollToItem(item, smoothScroll, velocity, dispatchSelected);
}
|
| android.support.v4.view.ViewPager$OnPageChangeListener | setInternalPageChangeListener(android.support.v4.view.ViewPager$OnPageChangeListener listener)Set a separate OnPageChangeListener for internal use by the support library.
OnPageChangeListener oldListener = mInternalPageChangeListener;
mInternalPageChangeListener = listener;
return oldListener;
|
| public void | setOffscreenPageLimit(int limit)Set the number of pages that should be retained to either side of the
current page in the view hierarchy in an idle state. Pages beyond this
limit will be recreated from the adapter when needed.
This is offered as an optimization. If you know in advance the number
of pages you will need to support or have lazy-loading mechanisms in place
on your pages, tweaking this setting can have benefits in perceived smoothness
of paging animations and interaction. If you have a small number of pages (3-4)
that you can keep active all at once, less time will be spent in layout for
newly created view subtrees as the user pages back and forth.
You should keep this limit low, especially if your pages have complex layouts.
This setting defaults to 1.
if (limit < DEFAULT_OFFSCREEN_PAGES) {
Log.w(TAG, "Requested offscreen page limit " + limit + " too small; defaulting to " +
DEFAULT_OFFSCREEN_PAGES);
limit = DEFAULT_OFFSCREEN_PAGES;
}
if (limit != mOffscreenPageLimit) {
mOffscreenPageLimit = limit;
populate();
}
|
| void | setOnAdapterChangeListener(android.support.v4.view.ViewPager$OnAdapterChangeListener listener)
mAdapterChangeListener = listener;
|
| public void | setOnPageChangeListener(android.support.v4.view.ViewPager$OnPageChangeListener listener)Set a listener that will be invoked whenever the page changes or is incrementally
scrolled. See {@link OnPageChangeListener}.
mOnPageChangeListener = listener;
|
| public void | setPageMargin(int marginPixels)Set the margin between pages.
final int oldMargin = mPageMargin;
mPageMargin = marginPixels;
final int width = getWidth();
recomputeScrollPosition(width, width, marginPixels, oldMargin);
requestLayout();
|
| public void | setPageMarginDrawable(android.graphics.drawable.Drawable d)Set a drawable that will be used to fill the margin between pages.
mMarginDrawable = d;
if (d != null) refreshDrawableState();
setWillNotDraw(d == null);
invalidate();
|
| public void | setPageMarginDrawable(int resId)Set a drawable that will be used to fill the margin between pages.
setPageMarginDrawable(getContext().getResources().getDrawable(resId));
|
| public void | setPageTransformer(boolean reverseDrawingOrder, android.support.v4.view.ViewPager$PageTransformer transformer)Set a {@link PageTransformer} that will be called for each attached page whenever
the scroll position is changed. This allows the application to apply custom property
transformations to each page, overriding the default sliding look and feel.
Note: Prior to Android 3.0 the property animation APIs did not exist.
As a result, setting a PageTransformer prior to Android 3.0 (API 11) will have no effect.
if (Build.VERSION.SDK_INT >= 11) {
final boolean hasTransformer = transformer != null;
final boolean needsPopulate = hasTransformer != (mPageTransformer != null);
mPageTransformer = transformer;
setChildrenDrawingOrderEnabledCompat(hasTransformer);
if (hasTransformer) {
mDrawingOrder = reverseDrawingOrder ? DRAW_ORDER_REVERSE : DRAW_ORDER_FORWARD;
} else {
mDrawingOrder = DRAW_ORDER_DEFAULT;
}
if (needsPopulate) populate();
}
|
| private void | setScrollState(int newState)
if (mScrollState == newState) {
return;
}
mScrollState = newState;
if (mPageTransformer != null) {
// PageTransformers can do complex things that benefit from hardware layers.
enableLayers(newState != SCROLL_STATE_IDLE);
}
if (mOnPageChangeListener != null) {
mOnPageChangeListener.onPageScrollStateChanged(newState);
}
|
| private void | setScrollingCacheEnabled(boolean enabled)
if (mScrollingCacheEnabled != enabled) {
mScrollingCacheEnabled = enabled;
if (USE_CACHE) {
final int size = getChildCount();
for (int i = 0; i < size; ++i) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
child.setDrawingCacheEnabled(enabled);
}
}
}
}
|
| void | smoothScrollTo(int x, int y)Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
smoothScrollTo(x, y, 0);
|
| void | smoothScrollTo(int x, int y, int velocity)Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
if (getChildCount() == 0) {
// Nothing to do.
setScrollingCacheEnabled(false);
return;
}
int sx = getScrollX();
int sy = getScrollY();
int dx = x - sx;
int dy = y - sy;
if (dx == 0 && dy == 0) {
completeScroll(false);
populate();
setScrollState(SCROLL_STATE_IDLE);
return;
}
setScrollingCacheEnabled(true);
setScrollState(SCROLL_STATE_SETTLING);
final int width = getClientWidth();
final int halfWidth = width / 2;
final float distanceRatio = Math.min(1f, 1.0f * Math.abs(dx) / width);
final float distance = halfWidth + halfWidth *
distanceInfluenceForSnapDuration(distanceRatio);
int duration = 0;
velocity = Math.abs(velocity);
if (velocity > 0) {
duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
} else {
final float pageWidth = width * mAdapter.getPageWidth(mCurItem);
final float pageDelta = (float) Math.abs(dx) / (pageWidth + mPageMargin);
duration = (int) ((pageDelta + 1) * 100);
}
duration = Math.min(duration, MAX_SETTLE_DURATION);
mScroller.startScroll(sx, sy, dx, dy, duration);
ViewCompat.postInvalidateOnAnimation(this);
|
| private void | sortChildDrawingOrder()
if (mDrawingOrder != DRAW_ORDER_DEFAULT) {
if (mDrawingOrderedChildren == null) {
mDrawingOrderedChildren = new ArrayList<View>();
} else {
mDrawingOrderedChildren.clear();
}
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = getChildAt(i);
mDrawingOrderedChildren.add(child);
}
Collections.sort(mDrawingOrderedChildren, sPositionComparator);
}
|
| protected boolean | verifyDrawable(android.graphics.drawable.Drawable who)
return super.verifyDrawable(who) || who == mMarginDrawable;
|
