/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.internal.view.menu;
import com.android.internal.view.menu.MenuBuilder.ItemInvoker;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.LayoutInflater;
import java.util.ArrayList;
/**
* The icon menu view is an icon-based menu usually with a subset of all the menu items.
* It is opened as the default menu, and shows either the first five or all six of the menu items
* with text and icon. In the situation of there being more than six items, the first five items
* will be accompanied with a 'More' button that opens an {@link ExpandedMenuView} which lists
* all the menu items.
*
* @attr ref android.R.styleable#IconMenuView_rowHeight
* @attr ref android.R.styleable#IconMenuView_maxRows
* @attr ref android.R.styleable#IconMenuView_maxItemsPerRow
*
* @hide
*/
public final class IconMenuView extends ViewGroup implements ItemInvoker, MenuView, Runnable {
private static final int ITEM_CAPTION_CYCLE_DELAY = 1000;
private MenuBuilder mMenu;
/** Height of each row */
private int mRowHeight;
/** Maximum number of rows to be shown */
private int mMaxRows;
/** Maximum number of items to show in the icon menu. */
private int mMaxItems;
/** Maximum number of items per row */
private int mMaxItemsPerRow;
/** Actual number of items (the 'More' view does not count as an item) shown */
private int mNumActualItemsShown;
/** Divider that is drawn between all rows */
private Drawable mHorizontalDivider;
/** Height of the horizontal divider */
private int mHorizontalDividerHeight;
/** Set of horizontal divider positions where the horizontal divider will be drawn */
private ArrayList<Rect> mHorizontalDividerRects;
/** Divider that is drawn between all columns */
private Drawable mVerticalDivider;
/** Width of the vertical divider */
private int mVerticalDividerWidth;
/** Set of vertical divider positions where the vertical divider will be drawn */
private ArrayList<Rect> mVerticalDividerRects;
/** Icon for the 'More' button */
private Drawable mMoreIcon;
/** Background of each item (should contain the selected and focused states) */
private Drawable mItemBackground;
/** Default animations for this menu */
private int mAnimations;
/**
* Whether this IconMenuView has stale children and needs to update them.
* Set true by {@link #markStaleChildren()} and reset to false by
* {@link #onMeasure(int, int)}
*/
private boolean mHasStaleChildren;
/**
* Longpress on MENU (while this is shown) switches to shortcut caption
* mode. When the user releases the longpress, we do not want to pass the
* key-up event up since that will dismiss the menu.
*/
private boolean mMenuBeingLongpressed = false;
/**
* While {@link #mMenuBeingLongpressed}, we toggle the children's caption
* mode between each's title and its shortcut. This is the last caption mode
* we broadcasted to children.
*/
private boolean mLastChildrenCaptionMode;
/**
* The layout to use for menu items. Each index is the row number (0 is the
* top-most). Each value contains the number of items in that row.
* <p>
* The length of this array should not be used to get the number of rows in
* the current layout, instead use {@link #mLayoutNumRows}.
*/
private int[] mLayout;
/**
* The number of rows in the current layout.
*/
private int mLayoutNumRows;
/**
* Instantiates the IconMenuView that is linked with the provided MenuBuilder.
*/
public IconMenuView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a =
context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.IconMenuView, 0, 0);
mRowHeight = a.getDimensionPixelSize(com.android.internal.R.styleable.IconMenuView_rowHeight, 64);
mMaxRows = a.getInt(com.android.internal.R.styleable.IconMenuView_maxRows, 2);
mMaxItems = a.getInt(com.android.internal.R.styleable.IconMenuView_maxItems, 6);
mMaxItemsPerRow = a.getInt(com.android.internal.R.styleable.IconMenuView_maxItemsPerRow, 3);
mMoreIcon = a.getDrawable(com.android.internal.R.styleable.IconMenuView_moreIcon);
a.recycle();
a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.MenuView, 0, 0);
mItemBackground = a.getDrawable(com.android.internal.R.styleable.MenuView_itemBackground);
mHorizontalDivider = a.getDrawable(com.android.internal.R.styleable.MenuView_horizontalDivider);
mHorizontalDividerRects = new ArrayList<Rect>();
mVerticalDivider = a.getDrawable(com.android.internal.R.styleable.MenuView_verticalDivider);
mVerticalDividerRects = new ArrayList<Rect>();
mAnimations = a.getResourceId(com.android.internal.R.styleable.MenuView_windowAnimationStyle, 0);
a.recycle();
if (mHorizontalDivider != null) {
mHorizontalDividerHeight = mHorizontalDivider.getIntrinsicHeight();
// Make sure to have some height for the divider
if (mHorizontalDividerHeight == -1) mHorizontalDividerHeight = 1;
}
if (mVerticalDivider != null) {
mVerticalDividerWidth = mVerticalDivider.getIntrinsicWidth();
// Make sure to have some width for the divider
if (mVerticalDividerWidth == -1) mVerticalDividerWidth = 1;
}
mLayout = new int[mMaxRows];
// This view will be drawing the dividers
setWillNotDraw(false);
// This is so we'll receive the MENU key in touch mode
setFocusableInTouchMode(true);
// This is so our children can still be arrow-key focused
setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
}
int getMaxItems() {
return mMaxItems;
}
/**
* Figures out the layout for the menu items.
*
* @param width The available width for the icon menu.
*/
private void layoutItems(int width) {
int numItems = getChildCount();
if (numItems == 0) {
mLayoutNumRows = 0;
return;
}
// Start with the least possible number of rows
int curNumRows =
Math.min((int) Math.ceil(numItems / (float) mMaxItemsPerRow), mMaxRows);
/*
* Increase the number of rows until we find a configuration that fits
* all of the items' titles. Worst case, we use mMaxRows.
*/
for (; curNumRows <= mMaxRows; curNumRows++) {
layoutItemsUsingGravity(curNumRows, numItems);
if (curNumRows >= numItems) {
// Can't have more rows than items
break;
}
if (doItemsFit()) {
// All the items fit, so this is a good configuration
break;
}
}
}
/**
* Figures out the layout for the menu items by equally distributing, and
* adding any excess items equally to lower rows.
*
* @param numRows The total number of rows for the menu view
* @param numItems The total number of items (across all rows) contained in
* the menu view
* @return int[] Where the value of index i contains the number of items for row i
*/
private void layoutItemsUsingGravity(int numRows, int numItems) {
int numBaseItemsPerRow = numItems / numRows;
int numLeftoverItems = numItems % numRows;
/**
* The bottom rows will each get a leftover item. Rows (indexed at 0)
* that are >= this get a leftover item. Note: if there are 0 leftover
* items, no rows will get them since this value will be greater than
* the last row.
*/
int rowsThatGetALeftoverItem = numRows - numLeftoverItems;
int[] layout = mLayout;
for (int i = 0; i < numRows; i++) {
layout[i] = numBaseItemsPerRow;
// Fill the bottom rows with a leftover item each
if (i >= rowsThatGetALeftoverItem) {
layout[i]++;
}
}
mLayoutNumRows = numRows;
}
/**
* Checks whether each item's title is fully visible using the current
* layout.
*
* @return True if the items fit (each item's text is fully visible), false
* otherwise.
*/
private boolean doItemsFit() {
int itemPos = 0;
int[] layout = mLayout;
int numRows = mLayoutNumRows;
for (int row = 0; row < numRows; row++) {
int numItemsOnRow = layout[row];
/*
* If there is only one item on this row, increasing the
* number of rows won't help.
*/
if (numItemsOnRow == 1) {
itemPos++;
continue;
}
for (int itemsOnRowCounter = numItemsOnRow; itemsOnRowCounter > 0;
itemsOnRowCounter--) {
View child = getChildAt(itemPos++);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (lp.maxNumItemsOnRow < numItemsOnRow) {
return false;
}
}
}
return true;
}
Drawable getItemBackgroundDrawable() {
return mItemBackground.getConstantState().newDrawable(getContext().getResources());
}
/**
* Creates the item view for the 'More' button which is used to switch to
* the expanded menu view. This button is a special case since it does not
* have a MenuItemData backing it.
* @return The IconMenuItemView for the 'More' button
*/
IconMenuItemView createMoreItemView() {
Context context = getContext();
LayoutInflater inflater = LayoutInflater.from(context);
final IconMenuItemView itemView = (IconMenuItemView) inflater.inflate(
com.android.internal.R.layout.icon_menu_item_layout, null);
Resources r = context.getResources();
itemView.initialize(r.getText(com.android.internal.R.string.more_item_label), mMoreIcon);
// Set up a click listener on the view since there will be no invocation sequence
// due to the lack of a MenuItemData this view
itemView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Switches the menu to expanded mode. Requires support from
// the menu's active callback.
mMenu.changeMenuMode();
}
});
return itemView;
}
public void initialize(MenuBuilder menu) {
mMenu = menu;
}
/**
* The positioning algorithm that gets called from onMeasure. It
* just computes positions for each child, and then stores them in the child's layout params.
* @param menuWidth The width of this menu to assume for positioning
* @param menuHeight The height of this menu to assume for positioning
*/
private void positionChildren(int menuWidth, int menuHeight) {
// Clear the containers for the positions where the dividers should be drawn
if (mHorizontalDivider != null) mHorizontalDividerRects.clear();
if (mVerticalDivider != null) mVerticalDividerRects.clear();
// Get the minimum number of rows needed
final int numRows = mLayoutNumRows;
final int numRowsMinus1 = numRows - 1;
final int numItemsForRow[] = mLayout;
// The item position across all rows
int itemPos = 0;
View child;
IconMenuView.LayoutParams childLayoutParams = null;
// Use float for this to get precise positions (uniform item widths
// instead of last one taking any slack), and then convert to ints at last opportunity
float itemLeft;
float itemTop = 0;
// Since each row can have a different number of items, this will be computed per row
float itemWidth;
// Subtract the space needed for the horizontal dividers
final float itemHeight = (menuHeight - mHorizontalDividerHeight * (numRows - 1))
/ (float)numRows;
for (int row = 0; row < numRows; row++) {
// Start at the left
itemLeft = 0;
// Subtract the space needed for the vertical dividers, and divide by the number of items
itemWidth = (menuWidth - mVerticalDividerWidth * (numItemsForRow[row] - 1))
/ (float)numItemsForRow[row];
for (int itemPosOnRow = 0; itemPosOnRow < numItemsForRow[row]; itemPosOnRow++) {
// Tell the child to be exactly this size
child = getChildAt(itemPos);
child.measure(MeasureSpec.makeMeasureSpec((int) itemWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec((int) itemHeight, MeasureSpec.EXACTLY));
// Remember the child's position for layout
childLayoutParams = (IconMenuView.LayoutParams) child.getLayoutParams();
childLayoutParams.left = (int) itemLeft;
childLayoutParams.right = (int) (itemLeft + itemWidth);
childLayoutParams.top = (int) itemTop;
childLayoutParams.bottom = (int) (itemTop + itemHeight);
// Increment by item width
itemLeft += itemWidth;
itemPos++;
// Add a vertical divider to draw
if (mVerticalDivider != null) {
mVerticalDividerRects.add(new Rect((int) itemLeft,
(int) itemTop, (int) (itemLeft + mVerticalDividerWidth),
(int) (itemTop + itemHeight)));
}
// Increment by divider width (even if we're not computing
// dividers, since we need to leave room for them when
// calculating item positions)
itemLeft += mVerticalDividerWidth;
}
// Last child on each row should extend to very right edge
if (childLayoutParams != null) {
childLayoutParams.right = menuWidth;
}
itemTop += itemHeight;
// Add a horizontal divider to draw
if ((mHorizontalDivider != null) && (row < numRowsMinus1)) {
mHorizontalDividerRects.add(new Rect(0, (int) itemTop, menuWidth,
(int) (itemTop + mHorizontalDividerHeight)));
itemTop += mHorizontalDividerHeight;
}
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int measuredWidth = resolveSize(Integer.MAX_VALUE, widthMeasureSpec);
calculateItemFittingMetadata(measuredWidth);
layoutItems(measuredWidth);
// Get the desired height of the icon menu view (last row of items does
// not have a divider below)
final int layoutNumRows = mLayoutNumRows;
final int desiredHeight = (mRowHeight + mHorizontalDividerHeight) *
layoutNumRows - mHorizontalDividerHeight;
// Maximum possible width and desired height
setMeasuredDimension(measuredWidth,
resolveSize(desiredHeight, heightMeasureSpec));
// Position the children
if (layoutNumRows > 0) {
positionChildren(getMeasuredWidth(), getMeasuredHeight());
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
View child;
IconMenuView.LayoutParams childLayoutParams;
for (int i = getChildCount() - 1; i >= 0; i--) {
child = getChildAt(i);
childLayoutParams = (IconMenuView.LayoutParams)child
.getLayoutParams();
// Layout children according to positions set during the measure
child.layout(childLayoutParams.left, childLayoutParams.top, childLayoutParams.right,
childLayoutParams.bottom);
}
}
@Override
protected void onDraw(Canvas canvas) {
Drawable drawable = mHorizontalDivider;
if (drawable != null) {
// If we have a horizontal divider to draw, draw it at the remembered positions
final ArrayList<Rect> rects = mHorizontalDividerRects;
for (int i = rects.size() - 1; i >= 0; i--) {
drawable.setBounds(rects.get(i));
drawable.draw(canvas);
}
}
drawable = mVerticalDivider;
if (drawable != null) {
// If we have a vertical divider to draw, draw it at the remembered positions
final ArrayList<Rect> rects = mVerticalDividerRects;
for (int i = rects.size() - 1; i >= 0; i--) {
drawable.setBounds(rects.get(i));
drawable.draw(canvas);
}
}
}
public boolean invokeItem(MenuItemImpl item) {
return mMenu.performItemAction(item, 0);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new IconMenuView.LayoutParams(getContext(), attrs);
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
// Override to allow type-checking of LayoutParams.
return p instanceof IconMenuView.LayoutParams;
}
/**
* Marks as having stale children.
*/
void markStaleChildren() {
if (!mHasStaleChildren) {
mHasStaleChildren = true;
requestLayout();
}
}
/**
* @return The number of actual items shown (those that are backed by an
* {@link MenuView.ItemView} implementation--eg: excludes More
* item).
*/
int getNumActualItemsShown() {
return mNumActualItemsShown;
}
void setNumActualItemsShown(int count) {
mNumActualItemsShown = count;
}
public int getWindowAnimations() {
return mAnimations;
}
/**
* Returns the number of items per row.
* <p>
* This should only be used for testing.
*
* @return The length of the array is the number of rows. A value at a
* position is the number of items in that row.
* @hide
*/
public int[] getLayout() {
return mLayout;
}
/**
* Returns the number of rows in the layout.
* <p>
* This should only be used for testing.
*
* @return The length of the array is the number of rows. A value at a
* position is the number of items in that row.
* @hide
*/
public int getLayoutNumRows() {
return mLayoutNumRows;
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_MENU) {
if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) {
removeCallbacks(this);
postDelayed(this, ViewConfiguration.getLongPressTimeout());
} else if (event.getAction() == KeyEvent.ACTION_UP) {
if (mMenuBeingLongpressed) {
// It was in cycle mode, so reset it (will also remove us
// from being called back)
setCycleShortcutCaptionMode(false);
return true;
} else {
// Just remove us from being called back
removeCallbacks(this);
// Fall through to normal processing too
}
}
}
return super.dispatchKeyEvent(event);
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
requestFocus();
}
@Override
protected void onDetachedFromWindow() {
setCycleShortcutCaptionMode(false);
super.onDetachedFromWindow();
}
@Override
public void onWindowFocusChanged(boolean hasWindowFocus) {
if (!hasWindowFocus) {
setCycleShortcutCaptionMode(false);
}
super.onWindowFocusChanged(hasWindowFocus);
}
/**
* Sets the shortcut caption mode for IconMenuView. This mode will
* continuously cycle between a child's shortcut and its title.
*
* @param cycleShortcutAndNormal Whether to go into cycling shortcut mode,
* or to go back to normal.
*/
private void setCycleShortcutCaptionMode(boolean cycleShortcutAndNormal) {
if (!cycleShortcutAndNormal) {
/*
* We're setting back to title, so remove any callbacks for setting
* to shortcut
*/
removeCallbacks(this);
setChildrenCaptionMode(false);
mMenuBeingLongpressed = false;
} else {
// Set it the first time (the cycle will be started in run()).
setChildrenCaptionMode(true);
}
}
/**
* When this method is invoked if the menu is currently not being
* longpressed, it means that the longpress has just been reached (so we set
* longpress flag, and start cycling). If it is being longpressed, we cycle
* to the next mode.
*/
public void run() {
if (mMenuBeingLongpressed) {
// Cycle to other caption mode on the children
setChildrenCaptionMode(!mLastChildrenCaptionMode);
} else {
// Switch ourselves to continuously cycle the items captions
mMenuBeingLongpressed = true;
setCycleShortcutCaptionMode(true);
}
// We should run again soon to cycle to the other caption mode
postDelayed(this, ITEM_CAPTION_CYCLE_DELAY);
}
/**
* Iterates children and sets the desired shortcut mode. Only
* {@link #setCycleShortcutCaptionMode(boolean)} and {@link #run()} should call
* this.
*
* @param shortcut Whether to show shortcut or the title.
*/
private void setChildrenCaptionMode(boolean shortcut) {
// Set the last caption mode pushed to children
mLastChildrenCaptionMode = shortcut;
for (int i = getChildCount() - 1; i >= 0; i--) {
((IconMenuItemView) getChildAt(i)).setCaptionMode(shortcut);
}
}
/**
* For each item, calculates the most dense row that fully shows the item's
* title.
*
* @param width The available width of the icon menu.
*/
private void calculateItemFittingMetadata(int width) {
int maxNumItemsPerRow = mMaxItemsPerRow;
int numItems = getChildCount();
for (int i = 0; i < numItems; i++) {
LayoutParams lp = (LayoutParams) getChildAt(i).getLayoutParams();
// Start with 1, since that case does not get covered in the loop below
lp.maxNumItemsOnRow = 1;
for (int curNumItemsPerRow = maxNumItemsPerRow; curNumItemsPerRow > 0;
curNumItemsPerRow--) {
// Check whether this item can fit into a row containing curNumItemsPerRow
if (lp.desiredWidth < width / curNumItemsPerRow) {
// It can, mark this value as the most dense row it can fit into
lp.maxNumItemsOnRow = curNumItemsPerRow;
break;
}
}
}
}
@Override
protected Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
View focusedView = getFocusedChild();
for (int i = getChildCount() - 1; i >= 0; i--) {
if (getChildAt(i) == focusedView) {
return new SavedState(superState, i);
}
}
return new SavedState(superState, -1);
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
super.onRestoreInstanceState(ss.getSuperState());
if (ss.focusedPosition >= getChildCount()) {
return;
}
View v = getChildAt(ss.focusedPosition);
if (v != null) {
v.requestFocus();
}
}
private static class SavedState extends BaseSavedState {
int focusedPosition;
/**
* Constructor called from {@link IconMenuView#onSaveInstanceState()}
*/
public SavedState(Parcelable superState, int focusedPosition) {
super(superState);
this.focusedPosition = focusedPosition;
}
/**
* Constructor called from {@link #CREATOR}
*/
private SavedState(Parcel in) {
super(in);
focusedPosition = in.readInt();
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
dest.writeInt(focusedPosition);
}
public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
/**
* Layout parameters specific to IconMenuView (stores the left, top, right, bottom from the
* measure pass).
*/
public static class LayoutParams extends ViewGroup.MarginLayoutParams
{
int left, top, right, bottom;
int desiredWidth;
int maxNumItemsOnRow;
public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
}
public LayoutParams(int width, int height) {
super(width, height);
}
}
}
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