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576 lines
22 KiB
Java
576 lines
22 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.actionbarsherlock.internal.view.menu;
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import android.content.Context;
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import android.content.res.Configuration;
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import android.graphics.Canvas;
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import android.os.Build;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.accessibility.AccessibilityEvent;
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import android.widget.LinearLayout;
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import com.actionbarsherlock.internal.widget.IcsLinearLayout;
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/**
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* @hide
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*/
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public class ActionMenuView extends IcsLinearLayout implements MenuBuilder.ItemInvoker, MenuView {
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//UNUSED private static final String TAG = "ActionMenuView";
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private static final boolean IS_FROYO = Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO;
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static final int MIN_CELL_SIZE = 56; // dips
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static final int GENERATED_ITEM_PADDING = 4; // dips
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private MenuBuilder mMenu;
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private boolean mReserveOverflow;
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private ActionMenuPresenter mPresenter;
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private boolean mFormatItems;
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private int mFormatItemsWidth;
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private int mMinCellSize;
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private int mGeneratedItemPadding;
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//UNUSED private int mMeasuredExtraWidth;
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private boolean mFirst = true;
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public ActionMenuView(Context context) {
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this(context, null);
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}
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public ActionMenuView(Context context, AttributeSet attrs) {
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super(context, attrs);
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setBaselineAligned(false);
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final float density = context.getResources().getDisplayMetrics().density;
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mMinCellSize = (int) (MIN_CELL_SIZE * density);
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mGeneratedItemPadding = (int) (GENERATED_ITEM_PADDING * density);
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}
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public void setPresenter(ActionMenuPresenter presenter) {
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mPresenter = presenter;
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}
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public boolean isExpandedFormat() {
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return mFormatItems;
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}
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@Override
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public void onConfigurationChanged(Configuration newConfig) {
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if (IS_FROYO) {
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super.onConfigurationChanged(newConfig);
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}
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mPresenter.updateMenuView(false);
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if (mPresenter != null && mPresenter.isOverflowMenuShowing()) {
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mPresenter.hideOverflowMenu();
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mPresenter.showOverflowMenu();
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}
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}
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@Override
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protected void onDraw(Canvas canvas) {
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//Need to trigger a relayout since we may have been added extremely
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//late in the initial rendering (e.g., when contained in a ViewPager).
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//See: https://github.com/JakeWharton/ActionBarSherlock/issues/272
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if (!IS_FROYO && mFirst) {
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mFirst = false;
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requestLayout();
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return;
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}
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super.onDraw(canvas);
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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// If we've been given an exact size to match, apply special formatting during layout.
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final boolean wasFormatted = mFormatItems;
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mFormatItems = MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY;
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if (wasFormatted != mFormatItems) {
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mFormatItemsWidth = 0; // Reset this when switching modes
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}
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// Special formatting can change whether items can fit as action buttons.
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// Kick the menu and update presenters when this changes.
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final int widthSize = MeasureSpec.getMode(widthMeasureSpec);
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if (mFormatItems && mMenu != null && widthSize != mFormatItemsWidth) {
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mFormatItemsWidth = widthSize;
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mMenu.onItemsChanged(true);
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}
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if (mFormatItems) {
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onMeasureExactFormat(widthMeasureSpec, heightMeasureSpec);
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} else {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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}
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private void onMeasureExactFormat(int widthMeasureSpec, int heightMeasureSpec) {
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// We already know the width mode is EXACTLY if we're here.
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final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
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int widthSize = MeasureSpec.getSize(widthMeasureSpec);
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int heightSize = MeasureSpec.getSize(heightMeasureSpec);
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final int widthPadding = getPaddingLeft() + getPaddingRight();
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final int heightPadding = getPaddingTop() + getPaddingBottom();
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widthSize -= widthPadding;
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// Divide the view into cells.
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final int cellCount = widthSize / mMinCellSize;
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final int cellSizeRemaining = widthSize % mMinCellSize;
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if (cellCount == 0) {
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// Give up, nothing fits.
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setMeasuredDimension(widthSize, 0);
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return;
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}
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final int cellSize = mMinCellSize + cellSizeRemaining / cellCount;
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int cellsRemaining = cellCount;
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int maxChildHeight = 0;
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int maxCellsUsed = 0;
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int expandableItemCount = 0;
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int visibleItemCount = 0;
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boolean hasOverflow = false;
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// This is used as a bitfield to locate the smallest items present. Assumes childCount < 64.
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long smallestItemsAt = 0;
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final int childCount = getChildCount();
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for (int i = 0; i < childCount; i++) {
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final View child = getChildAt(i);
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if (child.getVisibility() == GONE) continue;
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final boolean isGeneratedItem = child instanceof ActionMenuItemView;
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visibleItemCount++;
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if (isGeneratedItem) {
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// Reset padding for generated menu item views; it may change below
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// and views are recycled.
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child.setPadding(mGeneratedItemPadding, 0, mGeneratedItemPadding, 0);
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}
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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lp.expanded = false;
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lp.extraPixels = 0;
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lp.cellsUsed = 0;
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lp.expandable = false;
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lp.leftMargin = 0;
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lp.rightMargin = 0;
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lp.preventEdgeOffset = isGeneratedItem && ((ActionMenuItemView) child).hasText();
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// Overflow always gets 1 cell. No more, no less.
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final int cellsAvailable = lp.isOverflowButton ? 1 : cellsRemaining;
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final int cellsUsed = measureChildForCells(child, cellSize, cellsAvailable,
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heightMeasureSpec, heightPadding);
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maxCellsUsed = Math.max(maxCellsUsed, cellsUsed);
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if (lp.expandable) expandableItemCount++;
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if (lp.isOverflowButton) hasOverflow = true;
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cellsRemaining -= cellsUsed;
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maxChildHeight = Math.max(maxChildHeight, child.getMeasuredHeight());
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if (cellsUsed == 1) smallestItemsAt |= (1 << i);
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}
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// When we have overflow and a single expanded (text) item, we want to try centering it
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// visually in the available space even though overflow consumes some of it.
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final boolean centerSingleExpandedItem = hasOverflow && visibleItemCount == 2;
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// Divide space for remaining cells if we have items that can expand.
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// Try distributing whole leftover cells to smaller items first.
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boolean needsExpansion = false;
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while (expandableItemCount > 0 && cellsRemaining > 0) {
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int minCells = Integer.MAX_VALUE;
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long minCellsAt = 0; // Bit locations are indices of relevant child views
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int minCellsItemCount = 0;
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for (int i = 0; i < childCount; i++) {
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final View child = getChildAt(i);
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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// Don't try to expand items that shouldn't.
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if (!lp.expandable) continue;
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// Mark indices of children that can receive an extra cell.
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if (lp.cellsUsed < minCells) {
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minCells = lp.cellsUsed;
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minCellsAt = 1 << i;
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minCellsItemCount = 1;
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} else if (lp.cellsUsed == minCells) {
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minCellsAt |= 1 << i;
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minCellsItemCount++;
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}
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}
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// Items that get expanded will always be in the set of smallest items when we're done.
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smallestItemsAt |= minCellsAt;
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if (minCellsItemCount > cellsRemaining) break; // Couldn't expand anything evenly. Stop.
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// We have enough cells, all minimum size items will be incremented.
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minCells++;
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for (int i = 0; i < childCount; i++) {
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final View child = getChildAt(i);
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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if ((minCellsAt & (1 << i)) == 0) {
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// If this item is already at our small item count, mark it for later.
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if (lp.cellsUsed == minCells) smallestItemsAt |= 1 << i;
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continue;
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}
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if (centerSingleExpandedItem && lp.preventEdgeOffset && cellsRemaining == 1) {
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// Add padding to this item such that it centers.
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child.setPadding(mGeneratedItemPadding + cellSize, 0, mGeneratedItemPadding, 0);
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}
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lp.cellsUsed++;
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lp.expanded = true;
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cellsRemaining--;
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}
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needsExpansion = true;
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}
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// Divide any space left that wouldn't divide along cell boundaries
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// evenly among the smallest items
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final boolean singleItem = !hasOverflow && visibleItemCount == 1;
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if (cellsRemaining > 0 && smallestItemsAt != 0 &&
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(cellsRemaining < visibleItemCount - 1 || singleItem || maxCellsUsed > 1)) {
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float expandCount = Long.bitCount(smallestItemsAt);
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if (!singleItem) {
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// The items at the far edges may only expand by half in order to pin to either side.
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if ((smallestItemsAt & 1) != 0) {
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LayoutParams lp = (LayoutParams) getChildAt(0).getLayoutParams();
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if (!lp.preventEdgeOffset) expandCount -= 0.5f;
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}
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if ((smallestItemsAt & (1 << (childCount - 1))) != 0) {
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LayoutParams lp = ((LayoutParams) getChildAt(childCount - 1).getLayoutParams());
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if (!lp.preventEdgeOffset) expandCount -= 0.5f;
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}
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}
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final int extraPixels = expandCount > 0 ?
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(int) (cellsRemaining * cellSize / expandCount) : 0;
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for (int i = 0; i < childCount; i++) {
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if ((smallestItemsAt & (1 << i)) == 0) continue;
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final View child = getChildAt(i);
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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if (child instanceof ActionMenuItemView) {
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// If this is one of our views, expand and measure at the larger size.
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lp.extraPixels = extraPixels;
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lp.expanded = true;
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if (i == 0 && !lp.preventEdgeOffset) {
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// First item gets part of its new padding pushed out of sight.
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// The last item will get this implicitly from layout.
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lp.leftMargin = -extraPixels / 2;
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}
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needsExpansion = true;
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} else if (lp.isOverflowButton) {
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lp.extraPixels = extraPixels;
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lp.expanded = true;
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lp.rightMargin = -extraPixels / 2;
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needsExpansion = true;
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} else {
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// If we don't know what it is, give it some margins instead
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// and let it center within its space. We still want to pin
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// against the edges.
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if (i != 0) {
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lp.leftMargin = extraPixels / 2;
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}
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if (i != childCount - 1) {
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lp.rightMargin = extraPixels / 2;
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}
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}
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}
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cellsRemaining = 0;
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}
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// Remeasure any items that have had extra space allocated to them.
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if (needsExpansion) {
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int heightSpec = MeasureSpec.makeMeasureSpec(heightSize - heightPadding, heightMode);
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for (int i = 0; i < childCount; i++) {
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final View child = getChildAt(i);
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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if (!lp.expanded) continue;
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final int width = lp.cellsUsed * cellSize + lp.extraPixels;
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child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY), heightSpec);
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}
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}
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if (heightMode != MeasureSpec.EXACTLY) {
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heightSize = maxChildHeight;
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}
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setMeasuredDimension(widthSize, heightSize);
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//UNUSED mMeasuredExtraWidth = cellsRemaining * cellSize;
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}
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/**
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* Measure a child view to fit within cell-based formatting. The child's width
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* will be measured to a whole multiple of cellSize.
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*
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* <p>Sets the expandable and cellsUsed fields of LayoutParams.
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*
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* @param child Child to measure
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* @param cellSize Size of one cell
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* @param cellsRemaining Number of cells remaining that this view can expand to fill
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* @param parentHeightMeasureSpec MeasureSpec used by the parent view
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* @param parentHeightPadding Padding present in the parent view
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* @return Number of cells this child was measured to occupy
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*/
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static int measureChildForCells(View child, int cellSize, int cellsRemaining,
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int parentHeightMeasureSpec, int parentHeightPadding) {
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final LayoutParams lp = (LayoutParams) child.getLayoutParams();
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final int childHeightSize = MeasureSpec.getSize(parentHeightMeasureSpec) -
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parentHeightPadding;
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final int childHeightMode = MeasureSpec.getMode(parentHeightMeasureSpec);
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final int childHeightSpec = MeasureSpec.makeMeasureSpec(childHeightSize, childHeightMode);
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int cellsUsed = 0;
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if (cellsRemaining > 0) {
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final int childWidthSpec = MeasureSpec.makeMeasureSpec(
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cellSize * cellsRemaining, MeasureSpec.AT_MOST);
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child.measure(childWidthSpec, childHeightSpec);
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final int measuredWidth = child.getMeasuredWidth();
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cellsUsed = measuredWidth / cellSize;
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if (measuredWidth % cellSize != 0) cellsUsed++;
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}
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final ActionMenuItemView itemView = child instanceof ActionMenuItemView ?
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(ActionMenuItemView) child : null;
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final boolean expandable = !lp.isOverflowButton && itemView != null && itemView.hasText();
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lp.expandable = expandable;
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lp.cellsUsed = cellsUsed;
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final int targetWidth = cellsUsed * cellSize;
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child.measure(MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY),
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childHeightSpec);
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return cellsUsed;
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}
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@Override
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
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if (!mFormatItems) {
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super.onLayout(changed, left, top, right, bottom);
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return;
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}
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final int childCount = getChildCount();
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final int midVertical = (top + bottom) / 2;
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final int dividerWidth = 0;//getDividerWidth();
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int overflowWidth = 0;
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//UNUSED int nonOverflowWidth = 0;
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int nonOverflowCount = 0;
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int widthRemaining = right - left - getPaddingRight() - getPaddingLeft();
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boolean hasOverflow = false;
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for (int i = 0; i < childCount; i++) {
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final View v = getChildAt(i);
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if (v.getVisibility() == GONE) {
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continue;
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}
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LayoutParams p = (LayoutParams) v.getLayoutParams();
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if (p.isOverflowButton) {
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overflowWidth = v.getMeasuredWidth();
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if (hasDividerBeforeChildAt(i)) {
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overflowWidth += dividerWidth;
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}
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int height = v.getMeasuredHeight();
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int r = getWidth() - getPaddingRight() - p.rightMargin;
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int l = r - overflowWidth;
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int t = midVertical - (height / 2);
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int b = t + height;
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v.layout(l, t, r, b);
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widthRemaining -= overflowWidth;
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hasOverflow = true;
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} else {
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final int size = v.getMeasuredWidth() + p.leftMargin + p.rightMargin;
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//UNUSED nonOverflowWidth += size;
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widthRemaining -= size;
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//if (hasDividerBeforeChildAt(i)) {
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//UNUSED nonOverflowWidth += dividerWidth;
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//}
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nonOverflowCount++;
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}
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}
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if (childCount == 1 && !hasOverflow) {
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// Center a single child
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final View v = getChildAt(0);
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final int width = v.getMeasuredWidth();
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final int height = v.getMeasuredHeight();
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final int midHorizontal = (right - left) / 2;
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final int l = midHorizontal - width / 2;
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final int t = midVertical - height / 2;
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v.layout(l, t, l + width, t + height);
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return;
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}
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final int spacerCount = nonOverflowCount - (hasOverflow ? 0 : 1);
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final int spacerSize = Math.max(0, spacerCount > 0 ? widthRemaining / spacerCount : 0);
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int startLeft = getPaddingLeft();
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for (int i = 0; i < childCount; i++) {
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final View v = getChildAt(i);
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final LayoutParams lp = (LayoutParams) v.getLayoutParams();
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if (v.getVisibility() == GONE || lp.isOverflowButton) {
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continue;
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}
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startLeft += lp.leftMargin;
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int width = v.getMeasuredWidth();
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int height = v.getMeasuredHeight();
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int t = midVertical - height / 2;
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v.layout(startLeft, t, startLeft + width, t + height);
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startLeft += width + lp.rightMargin + spacerSize;
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}
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}
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@Override
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public void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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mPresenter.dismissPopupMenus();
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}
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public boolean isOverflowReserved() {
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return mReserveOverflow;
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}
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public void setOverflowReserved(boolean reserveOverflow) {
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mReserveOverflow = reserveOverflow;
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}
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@Override
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protected LayoutParams generateDefaultLayoutParams() {
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LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT,
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LayoutParams.WRAP_CONTENT);
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params.gravity = Gravity.CENTER_VERTICAL;
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return params;
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}
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@Override
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public LayoutParams generateLayoutParams(AttributeSet attrs) {
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return new LayoutParams(getContext(), attrs);
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}
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@Override
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protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
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if (p instanceof LayoutParams) {
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LayoutParams result = new LayoutParams((LayoutParams) p);
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if (result.gravity <= Gravity.NO_GRAVITY) {
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result.gravity = Gravity.CENTER_VERTICAL;
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}
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return result;
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}
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return generateDefaultLayoutParams();
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}
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@Override
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protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
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return p != null && p instanceof LayoutParams;
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}
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public LayoutParams generateOverflowButtonLayoutParams() {
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LayoutParams result = generateDefaultLayoutParams();
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result.isOverflowButton = true;
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return result;
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}
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public boolean invokeItem(MenuItemImpl item) {
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return mMenu.performItemAction(item, 0);
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}
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public int getWindowAnimations() {
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return 0;
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}
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|
|
public void initialize(MenuBuilder menu) {
|
|
mMenu = menu;
|
|
}
|
|
|
|
//@Override
|
|
protected boolean hasDividerBeforeChildAt(int childIndex) {
|
|
if (childIndex == 0) {
|
|
return false;
|
|
}
|
|
final View childBefore = getChildAt(childIndex - 1);
|
|
final View child = getChildAt(childIndex);
|
|
boolean result = false;
|
|
if (childIndex < getChildCount() && childBefore instanceof ActionMenuChildView) {
|
|
result |= ((ActionMenuChildView) childBefore).needsDividerAfter();
|
|
}
|
|
if (childIndex > 0 && child instanceof ActionMenuChildView) {
|
|
result |= ((ActionMenuChildView) child).needsDividerBefore();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
|
|
return false;
|
|
}
|
|
|
|
public interface ActionMenuChildView {
|
|
public boolean needsDividerBefore();
|
|
public boolean needsDividerAfter();
|
|
}
|
|
|
|
public static class LayoutParams extends LinearLayout.LayoutParams {
|
|
public boolean isOverflowButton;
|
|
public int cellsUsed;
|
|
public int extraPixels;
|
|
public boolean expandable;
|
|
public boolean preventEdgeOffset;
|
|
|
|
public boolean expanded;
|
|
|
|
public LayoutParams(Context c, AttributeSet attrs) {
|
|
super(c, attrs);
|
|
}
|
|
|
|
public LayoutParams(LayoutParams other) {
|
|
super((LinearLayout.LayoutParams) other);
|
|
isOverflowButton = other.isOverflowButton;
|
|
}
|
|
|
|
public LayoutParams(int width, int height) {
|
|
super(width, height);
|
|
isOverflowButton = false;
|
|
}
|
|
|
|
public LayoutParams(int width, int height, boolean isOverflowButton) {
|
|
super(width, height);
|
|
this.isOverflowButton = isOverflowButton;
|
|
}
|
|
}
|
|
}
|