File	Doc	Category	Size	Date	Package
OrientationHelper.java	API Doc	Android 5.1 API	12209	Thu Mar 12 22:22:56 GMT 2015	android.support.v7.widget

OrientationHelper

• java.lang.Object

Fields Summary
private static final int	INVALID_SIZE
protected final RecyclerView.LayoutManager	mLayoutManager
public static final int	HORIZONTAL
public static final int	VERTICAL
private int	mLastTotalSpace

Constructors Summary
private OrientationHelper(RecyclerView.LayoutManager layoutManager) mLayoutManager = layoutManager;

Methods Summary
public static android.support.v7.widget.OrientationHelper	createHorizontalHelper(RecyclerView.LayoutManager layoutManager) Creates a horizontal OrientationHelper for the given LayoutManager. param layoutManager The LayoutManager to attach to. return A new OrientationHelper return new OrientationHelper(layoutManager) { @Override public int getEndAfterPadding() { return mLayoutManager.getWidth() - mLayoutManager.getPaddingRight(); } @Override public int getEnd() { return mLayoutManager.getWidth(); } @Override public void offsetChildren(int amount) { mLayoutManager.offsetChildrenHorizontal(amount); } @Override public int getStartAfterPadding() { return mLayoutManager.getPaddingLeft(); } @Override public int getDecoratedMeasurement(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedMeasuredWidth(view) + params.leftMargin + params.rightMargin; } @Override public int getDecoratedMeasurementInOther(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedMeasuredHeight(view) + params.topMargin + params.bottomMargin; } @Override public int getDecoratedEnd(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedRight(view) + params.rightMargin; } @Override public int getDecoratedStart(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedLeft(view) - params.leftMargin; } @Override public int getTotalSpace() { return mLayoutManager.getWidth() - mLayoutManager.getPaddingLeft() - mLayoutManager.getPaddingRight(); } @Override public void offsetChild(View view, int offset) { view.offsetLeftAndRight(offset); } @Override public int getEndPadding() { return mLayoutManager.getPaddingRight(); } };
public static android.support.v7.widget.OrientationHelper	createOrientationHelper(RecyclerView.LayoutManager layoutManager, int orientation) Creates an OrientationHelper for the given LayoutManager and orientation. param layoutManager LayoutManager to attach to param orientation Desired orientation. Should be {@link #HORIZONTAL} or {@link #VERTICAL} return A new OrientationHelper switch (orientation) { case HORIZONTAL: return createHorizontalHelper(layoutManager); case VERTICAL: return createVerticalHelper(layoutManager); } throw new IllegalArgumentException("invalid orientation");
public static android.support.v7.widget.OrientationHelper	createVerticalHelper(RecyclerView.LayoutManager layoutManager) Creates a vertical OrientationHelper for the given LayoutManager. param layoutManager The LayoutManager to attach to. return A new OrientationHelper return new OrientationHelper(layoutManager) { @Override public int getEndAfterPadding() { return mLayoutManager.getHeight() - mLayoutManager.getPaddingBottom(); } @Override public int getEnd() { return mLayoutManager.getHeight(); } @Override public void offsetChildren(int amount) { mLayoutManager.offsetChildrenVertical(amount); } @Override public int getStartAfterPadding() { return mLayoutManager.getPaddingTop(); } @Override public int getDecoratedMeasurement(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedMeasuredHeight(view) + params.topMargin + params.bottomMargin; } @Override public int getDecoratedMeasurementInOther(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedMeasuredWidth(view) + params.leftMargin + params.rightMargin; } @Override public int getDecoratedEnd(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedBottom(view) + params.bottomMargin; } @Override public int getDecoratedStart(View view) { final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams(); return mLayoutManager.getDecoratedTop(view) - params.topMargin; } @Override public int getTotalSpace() { return mLayoutManager.getHeight() - mLayoutManager.getPaddingTop() - mLayoutManager.getPaddingBottom(); } @Override public void offsetChild(View view, int offset) { view.offsetTopAndBottom(offset); } @Override public int getEndPadding() { return mLayoutManager.getPaddingBottom(); } };
public abstract int	getDecoratedEnd(android.view.View view) Returns the end of the view including its decoration and margin. For example, for the horizontal helper, if a View's right is at pixel 200, has 2px right decoration and 3px right margin, returned value will be 205. param view The view element to check return The last pixel of the element see #getDecoratedStart(android.view.View)
public abstract int	getDecoratedMeasurement(android.view.View view) Returns the space occupied by this View in the current orientation including decorations and margins. param view The view element to check return Total space occupied by this view see #getDecoratedMeasurementInOther(View)
public abstract int	getDecoratedMeasurementInOther(android.view.View view) Returns the space occupied by this View in the perpendicular orientation including decorations and margins. param view The view element to check return Total space occupied by this view in the perpendicular orientation to current one see #getDecoratedMeasurement(View)
public abstract int	getDecoratedStart(android.view.View view) Returns the start of the view including its decoration and margin. For example, for the horizontal helper, if a View's left is at pixel 20, has 2px left decoration and 3px left margin, returned value will be 15px. param view The view element to check return The first pixel of the element see #getDecoratedEnd(android.view.View)
public abstract int	getEnd() Returns the end position of the layout without taking padding into account. return The end boundary for this layout without considering padding.
public abstract int	getEndAfterPadding() Returns the end position of the layout after the end padding is removed. return The end boundary for this layout.
public abstract int	getEndPadding() Returns the padding at the end of the layout. For horizontal helper, this is the right padding and for vertical helper, this is the bottom padding. This method does not check whether the layout is RTL or not. return The padding at the end of the layout.
public abstract int	getStartAfterPadding() Returns the start position of the layout after the start padding is added. return The very first pixel we can draw.
public abstract int	getTotalSpace() Returns the total space to layout. This number is the difference between {@link #getEndAfterPadding()} and {@link #getStartAfterPadding()}. return Total space to layout children
public int	getTotalSpaceChange() Returns the layout space change between the previous layout pass and current layout pass. Make sure you call {@link #onLayoutComplete()} at the end of your LayoutManager's {@link RecyclerView.LayoutManager#onLayoutChildren(RecyclerView.Recycler, RecyclerView.State)} method. return The difference between the current total space and previous layout's total space. see #onLayoutComplete() return INVALID_SIZE == mLastTotalSpace ? 0 : getTotalSpace() - mLastTotalSpace;
public abstract void	offsetChild(android.view.View view, int offset) Offsets the child in this orientation. param view View to offset param offset offset amount
public abstract void	offsetChildren(int amount) Offsets all children's positions by the given amount. param amount Value to add to each child's layout parameters
public void	onLayoutComplete() Call this method after onLayout method is complete if state is NOT pre-layout. This method records information like layout bounds that might be useful in the next layout calculations. mLastTotalSpace = getTotalSpace();