diff options
Diffstat (limited to 'com_actionbarsherlock/src/com/actionbarsherlock/internal/view/menu/ActionMenuView.java')
| -rw-r--r-- | com_actionbarsherlock/src/com/actionbarsherlock/internal/view/menu/ActionMenuView.java | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/com_actionbarsherlock/src/com/actionbarsherlock/internal/view/menu/ActionMenuView.java b/com_actionbarsherlock/src/com/actionbarsherlock/internal/view/menu/ActionMenuView.java new file mode 100644 index 000000000..40ab73c50 --- /dev/null +++ b/com_actionbarsherlock/src/com/actionbarsherlock/internal/view/menu/ActionMenuView.java @@ -0,0 +1,572 @@ +/* + * Copyright (C) 2010 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.actionbarsherlock.internal.view.menu; + +import android.content.Context; +import android.content.res.Configuration; +import android.graphics.Canvas; +import android.os.Build; +import android.util.AttributeSet; +import android.view.Gravity; +import android.view.View; +import android.view.ViewGroup; +import android.view.accessibility.AccessibilityEvent; +import android.widget.LinearLayout; +import com.actionbarsherlock.internal.widget.IcsLinearLayout; + +/** + * @hide + */ +public class ActionMenuView extends IcsLinearLayout implements MenuBuilder.ItemInvoker, MenuView { + //UNUSED private static final String TAG = "ActionMenuView"; + private static final boolean IS_FROYO = Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO; + + static final int MIN_CELL_SIZE = 56; // dips + static final int GENERATED_ITEM_PADDING = 4; // dips + + private MenuBuilder mMenu; + + private boolean mReserveOverflow; + private ActionMenuPresenter mPresenter; + private boolean mFormatItems; + private int mFormatItemsWidth; + private int mMinCellSize; + private int mGeneratedItemPadding; + //UNUSED private int mMeasuredExtraWidth; + + private boolean mFirst = true; + + public ActionMenuView(Context context) { + this(context, null); + } + + public ActionMenuView(Context context, AttributeSet attrs) { + super(context, attrs); + setBaselineAligned(false); + final float density = context.getResources().getDisplayMetrics().density; + mMinCellSize = (int) (MIN_CELL_SIZE * density); + mGeneratedItemPadding = (int) (GENERATED_ITEM_PADDING * density); + } + + public void setPresenter(ActionMenuPresenter presenter) { + mPresenter = presenter; + } + + public boolean isExpandedFormat() { + return mFormatItems; + } + + @Override + public void onConfigurationChanged(Configuration newConfig) { + if (IS_FROYO) { + super.onConfigurationChanged(newConfig); + } + mPresenter.updateMenuView(false); + + if (mPresenter != null && mPresenter.isOverflowMenuShowing()) { + mPresenter.hideOverflowMenu(); + mPresenter.showOverflowMenu(); + } + } + + @Override + protected void onDraw(Canvas canvas) { + //Need to trigger a relayout since we may have been added extremely + //late in the initial rendering (e.g., when contained in a ViewPager). + //See: https://github.com/JakeWharton/ActionBarSherlock/issues/272 + if (!IS_FROYO && mFirst) { + mFirst = false; + requestLayout(); + return; + } + super.onDraw(canvas); + } + + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { + // If we've been given an exact size to match, apply special formatting during layout. + final boolean wasFormatted = mFormatItems; + mFormatItems = MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.EXACTLY; + + if (wasFormatted != mFormatItems) { + mFormatItemsWidth = 0; // Reset this when switching modes + } + + // Special formatting can change whether items can fit as action buttons. + // Kick the menu and update presenters when this changes. + final int widthSize = MeasureSpec.getMode(widthMeasureSpec); + if (mFormatItems && mMenu != null && widthSize != mFormatItemsWidth) { + mFormatItemsWidth = widthSize; + mMenu.onItemsChanged(true); + } + + if (mFormatItems) { + onMeasureExactFormat(widthMeasureSpec, heightMeasureSpec); + } else { + super.onMeasure(widthMeasureSpec, heightMeasureSpec); + } + } + + private void onMeasureExactFormat(int widthMeasureSpec, int heightMeasureSpec) { + // We already know the width mode is EXACTLY if we're here. + final int heightMode = MeasureSpec.getMode(heightMeasureSpec); + int widthSize = MeasureSpec.getSize(widthMeasureSpec); + int heightSize = MeasureSpec.getSize(heightMeasureSpec); + + final int widthPadding = getPaddingLeft() + getPaddingRight(); + final int heightPadding = getPaddingTop() + getPaddingBottom(); + + widthSize -= widthPadding; + + // Divide the view into cells. + final int cellCount = widthSize / mMinCellSize; + final int cellSizeRemaining = widthSize % mMinCellSize; + + if (cellCount == 0) { + // Give up, nothing fits. + setMeasuredDimension(widthSize, 0); + return; + } + + final int cellSize = mMinCellSize + cellSizeRemaining / cellCount; + + int cellsRemaining = cellCount; + int maxChildHeight = 0; + int maxCellsUsed = 0; + int expandableItemCount = 0; + int visibleItemCount = 0; + boolean hasOverflow = false; + + // This is used as a bitfield to locate the smallest items present. Assumes childCount < 64. + long smallestItemsAt = 0; + + final int childCount = getChildCount(); + for (int i = 0; i < childCount; i++) { + final View child = getChildAt(i); + if (child.getVisibility() == GONE) continue; + + final boolean isGeneratedItem = child instanceof ActionMenuItemView; + visibleItemCount++; + + if (isGeneratedItem) { + // Reset padding for generated menu item views; it may change below + // and views are recycled. + child.setPadding(mGeneratedItemPadding, 0, mGeneratedItemPadding, 0); + } + + final LayoutParams lp = (LayoutParams) child.getLayoutParams(); + lp.expanded = false; + lp.extraPixels = 0; + lp.cellsUsed = 0; + lp.expandable = false; + lp.leftMargin = 0; + lp.rightMargin = 0; + lp.preventEdgeOffset = isGeneratedItem && ((ActionMenuItemView) child).hasText(); + + // Overflow always gets 1 cell. No more, no less. + final int cellsAvailable = lp.isOverflowButton ? 1 : cellsRemaining; + + final int cellsUsed = measureChildForCells(child, cellSize, cellsAvailable, + heightMeasureSpec, heightPadding); + + maxCellsUsed = Math.max(maxCellsUsed, cellsUsed); + if (lp.expandable) expandableItemCount++; + if (lp.isOverflowButton) hasOverflow = true; + + cellsRemaining -= cellsUsed; + maxChildHeight = Math.max(maxChildHeight, child.getMeasuredHeight()); + if (cellsUsed == 1) smallestItemsAt |= (1 << i); + } + + // When we have overflow and a single expanded (text) item, we want to try centering it + // visually in the available space even though overflow consumes some of it. + final boolean centerSingleExpandedItem = hasOverflow && visibleItemCount == 2; + + // Divide space for remaining cells if we have items that can expand. + // Try distributing whole leftover cells to smaller items first. + + boolean needsExpansion = false; + while (expandableItemCount > 0 && cellsRemaining > 0) { + int minCells = Integer.MAX_VALUE; + long minCellsAt = 0; // Bit locations are indices of relevant child views + int minCellsItemCount = 0; + for (int i = 0; i < childCount; i++) { + final View child = getChildAt(i); + final LayoutParams lp = (LayoutParams) child.getLayoutParams(); + + // Don't try to expand items that shouldn't. + if (!lp.expandable) continue; + + // Mark indices of children that can receive an extra cell. + if (lp.cellsUsed < minCells) { + minCells = lp.cellsUsed; + minCellsAt = 1 << i; + minCellsItemCount = 1; + } else if (lp.cellsUsed == minCells) { + minCellsAt |= 1 << i; + minCellsItemCount++; + } + } + + // Items that get expanded will always be in the set of smallest items when we're done. + smallestItemsAt |= minCellsAt; + + if (minCellsItemCount > cellsRemaining) break; // Couldn't expand anything evenly. Stop. + + // We have enough cells, all minimum size items will be incremented. + minCells++; + + for (int i = 0; i < childCount; i++) { + final View child = getChildAt(i); + final LayoutParams lp = (LayoutParams) child.getLayoutParams(); + if ((minCellsAt & (1 << i)) == 0) { + // If this item is already at our small item count, mark it for later. + if (lp.cellsUsed == minCells) smallestItemsAt |= 1 << i; + continue; + } + + if (centerSingleExpandedItem && lp.preventEdgeOffset && cellsRemaining == 1) { + // Add padding to this item such that it centers. + child.setPadding(mGeneratedItemPadding + cellSize, 0, mGeneratedItemPadding, 0); + } + lp.cellsUsed++; + lp.expanded = true; + cellsRemaining--; + } + + needsExpansion = true; + } + + // Divide any space left that wouldn't divide along cell boundaries + // evenly among the smallest items + + final boolean singleItem = !hasOverflow && visibleItemCount == 1; + if (cellsRemaining > 0 && smallestItemsAt != 0 && + (cellsRemaining < visibleItemCount - 1 || singleItem || maxCellsUsed > 1)) { + float expandCount = Long.bitCount(smallestItemsAt); + + if (!singleItem) { + // The items at the far edges may only expand by half in order to pin to either side. + if ((smallestItemsAt & 1) != 0) { + LayoutParams lp = (LayoutParams) getChildAt(0).getLayoutParams(); + if (!lp.preventEdgeOffset) expandCount -= 0.5f; + } + if ((smallestItemsAt & (1 << (childCount - 1))) != 0) { + LayoutParams lp = ((LayoutParams) getChildAt(childCount - 1).getLayoutParams()); + if (!lp.preventEdgeOffset) expandCount -= 0.5f; + } + } + + final int extraPixels = expandCount > 0 ? + (int) (cellsRemaining * cellSize / expandCount) : 0; + + for (int i = 0; i < childCount; i++) { + if ((smallestItemsAt & (1 << i)) == 0) continue; + + final View child = getChildAt(i); + final LayoutParams lp = (LayoutParams) child.getLayoutParams(); + if (child instanceof ActionMenuItemView) { + // If this is one of our views, expand and measure at the larger size. + lp.extraPixels = extraPixels; + lp.expanded = true; + if (i == 0 && !lp.preventEdgeOffset) { + // First item gets part of its new padding pushed out of sight. + // The last item will get this implicitly from layout. + lp.leftMargin = -extraPixels / 2; + } + needsExpansion = true; + } else if (lp.isOverflowButton) { + lp.extraPixels = extraPixels; + lp.expanded = true; + lp.rightMargin = -extraPixels / 2; + needsExpansion = true; + } else { + // If we don't know what it is, give it some margins instead + // and let it center within its space. We still want to pin + // against the edges. + if (i != 0) { + lp.leftMargin = extraPixels / 2; + } + if (i != childCount - 1) { + lp.rightMargin = extraPixels / 2; + } + } + } + + cellsRemaining = 0; + } + + // Remeasure any items that have had extra space allocated to them. + if (needsExpansion) { + int heightSpec = MeasureSpec.makeMeasureSpec(heightSize - heightPadding, heightMode); + for (int i = 0; i < childCount; i++) { + final View child = getChildAt(i); + final LayoutParams lp = (LayoutParams) child.getLayoutParams(); + + if (!lp.expanded) continue; + + final int width = lp.cellsUsed * cellSize + lp.extraPixels; + child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY), heightSpec); + } + } + + if (heightMode != MeasureSpec.EXACTLY) { + heightSize = maxChildHeight; + } + + setMeasuredDimension(widthSize, heightSize); + //UNUSED mMeasuredExtraWidth = cellsRemaining * cellSize; + } + + /** + * Measure a child view to fit within cell-based formatting. The child's width + * will be measured to a whole multiple of cellSize. + * + * <p>Sets the expandable and cellsUsed fields of LayoutParams. + * + * @param child Child to measure + * @param cellSize Size of one cell + * @param cellsRemaining Number of cells remaining that this view can expand to fill + * @param parentHeightMeasureSpec MeasureSpec used by the parent view + * @param parentHeightPadding Padding present in the parent view + * @return Number of cells this child was measured to occupy + */ + static int measureChildForCells(View child, int cellSize, int cellsRemaining, + int parentHeightMeasureSpec, int parentHeightPadding) { + final LayoutParams lp = (LayoutParams) child.getLayoutParams(); + + final int childHeightSize = MeasureSpec.getSize(parentHeightMeasureSpec) - + parentHeightPadding; + final int childHeightMode = MeasureSpec.getMode(parentHeightMeasureSpec); + final int childHeightSpec = MeasureSpec.makeMeasureSpec(childHeightSize, childHeightMode); + + int cellsUsed = 0; + if (cellsRemaining > 0) { + final int childWidthSpec = MeasureSpec.makeMeasureSpec( + cellSize * cellsRemaining, MeasureSpec.AT_MOST); + child.measure(childWidthSpec, childHeightSpec); + + final int measuredWidth = child.getMeasuredWidth(); + cellsUsed = measuredWidth / cellSize; + if (measuredWidth % cellSize != 0) cellsUsed++; + } + + final ActionMenuItemView itemView = child instanceof ActionMenuItemView ? + (ActionMenuItemView) child : null; + final boolean expandable = !lp.isOverflowButton && itemView != null && itemView.hasText(); + lp.expandable = expandable; + + lp.cellsUsed = cellsUsed; + final int targetWidth = cellsUsed * cellSize; + child.measure(MeasureSpec.makeMeasureSpec(targetWidth, MeasureSpec.EXACTLY), + childHeightSpec); + return cellsUsed; + } + + @Override + protected void onLayout(boolean changed, int left, int top, int right, int bottom) { + if (!mFormatItems) { + super.onLayout(changed, left, top, right, bottom); + return; + } + + final int childCount = getChildCount(); + final int midVertical = (top + bottom) / 2; + final int dividerWidth = 0;//getDividerWidth(); + int overflowWidth = 0; + //UNUSED int nonOverflowWidth = 0; + int nonOverflowCount = 0; + int widthRemaining = right - left - getPaddingRight() - getPaddingLeft(); + boolean hasOverflow = false; + for (int i = 0; i < childCount; i++) { + final View v = getChildAt(i); + if (v.getVisibility() == GONE) { + continue; + } + + LayoutParams p = (LayoutParams) v.getLayoutParams(); + if (p.isOverflowButton) { + overflowWidth = v.getMeasuredWidth(); + if (hasDividerBeforeChildAt(i)) { + overflowWidth += dividerWidth; + } + + int height = v.getMeasuredHeight(); + int r = getWidth() - getPaddingRight() - p.rightMargin; + int l = r - overflowWidth; + int t = midVertical - (height / 2); + int b = t + height; + v.layout(l, t, r, b); + + widthRemaining -= overflowWidth; + hasOverflow = true; + } else { + final int size = v.getMeasuredWidth() + p.leftMargin + p.rightMargin; + //UNUSED nonOverflowWidth += size; + widthRemaining -= size; + if (hasDividerBeforeChildAt(i)) { + //UNUSED nonOverflowWidth += dividerWidth; + } + nonOverflowCount++; + } + } + + if (childCount == 1 && !hasOverflow) { + // Center a single child + final View v = getChildAt(0); + final int width = v.getMeasuredWidth(); + final int height = v.getMeasuredHeight(); + final int midHorizontal = (right - left) / 2; + final int l = midHorizontal - width / 2; + final int t = midVertical - height / 2; + v.layout(l, t, l + width, t + height); + return; + } + + final int spacerCount = nonOverflowCount - (hasOverflow ? 0 : 1); + final int spacerSize = Math.max(0, spacerCount > 0 ? widthRemaining / spacerCount : 0); + + int startLeft = getPaddingLeft(); + for (int i = 0; i < childCount; i++) { + final View v = getChildAt(i); + final LayoutParams lp = (LayoutParams) v.getLayoutParams(); + if (v.getVisibility() == GONE || lp.isOverflowButton) { + continue; + } + + startLeft += lp.leftMargin; + int width = v.getMeasuredWidth(); + int height = v.getMeasuredHeight(); + int t = midVertical - height / 2; + v.layout(startLeft, t, startLeft + width, t + height); + startLeft += width + lp.rightMargin + spacerSize; + } + } + + @Override + public void onDetachedFromWindow() { + super.onDetachedFromWindow(); + mPresenter.dismissPopupMenus(); + } + + public boolean isOverflowReserved() { + return mReserveOverflow; + } + + public void setOverflowReserved(boolean reserveOverflow) { + mReserveOverflow = reserveOverflow; + } + + @Override + protected LayoutParams generateDefaultLayoutParams() { + LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, + LayoutParams.WRAP_CONTENT); + params.gravity = Gravity.CENTER_VERTICAL; + return params; + } + + @Override + public LayoutParams generateLayoutParams(AttributeSet attrs) { + return new LayoutParams(getContext(), attrs); + } + + @Override + protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { + if (p instanceof LayoutParams) { + LayoutParams result = new LayoutParams((LayoutParams) p); + if (result.gravity <= Gravity.NO_GRAVITY) { + result.gravity = Gravity.CENTER_VERTICAL; + } + return result; + } + return generateDefaultLayoutParams(); + } + + @Override + protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { + return p != null && p instanceof LayoutParams; + } + + public LayoutParams generateOverflowButtonLayoutParams() { + LayoutParams result = generateDefaultLayoutParams(); + result.isOverflowButton = true; + return result; + } + + public boolean invokeItem(MenuItemImpl item) { + return mMenu.performItemAction(item, 0); + } + + public int getWindowAnimations() { + return 0; + } + + public void initialize(MenuBuilder menu) { + mMenu = menu; + } + + //@Override + protected boolean hasDividerBeforeChildAt(int childIndex) { + 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; + } + } +} |