1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher2; 18 19 import android.content.Context; 20 import android.graphics.Rect; 21 import android.view.View; 22 import android.view.ViewGroup; 23 24 /** 25 * An abstraction of the original CellLayout which supports laying out items 26 * which span multiple cells into a grid-like layout. Also supports dimming 27 * to give a preview of its contents. 28 */ 29 public class PagedViewCellLayoutChildren extends ViewGroup { 30 static final String TAG = "PagedViewCellLayout"; 31 32 private boolean mCenterContent; 33 34 private int mCellWidth; 35 private int mCellHeight; 36 private int mWidthGap; 37 private int mHeightGap; 38 PagedViewCellLayoutChildren(Context context)39 public PagedViewCellLayoutChildren(Context context) { 40 super(context); 41 } 42 43 @Override cancelLongPress()44 public void cancelLongPress() { 45 super.cancelLongPress(); 46 47 // Cancel long press for all children 48 final int count = getChildCount(); 49 for (int i = 0; i < count; i++) { 50 final View child = getChildAt(i); 51 child.cancelLongPress(); 52 } 53 } 54 setGap(int widthGap, int heightGap)55 public void setGap(int widthGap, int heightGap) { 56 mWidthGap = widthGap; 57 mHeightGap = heightGap; 58 requestLayout(); 59 } 60 setCellDimensions(int width, int height)61 public void setCellDimensions(int width, int height) { 62 mCellWidth = width; 63 mCellHeight = height; 64 requestLayout(); 65 } 66 67 @Override requestChildFocus(View child, View focused)68 public void requestChildFocus(View child, View focused) { 69 super.requestChildFocus(child, focused); 70 if (child != null) { 71 Rect r = new Rect(); 72 child.getDrawingRect(r); 73 requestRectangleOnScreen(r); 74 } 75 } 76 77 @Override onMeasure(int widthMeasureSpec, int heightMeasureSpec)78 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 79 int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec); 80 int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec); 81 82 int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec); 83 int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec); 84 85 if (widthSpecMode == MeasureSpec.UNSPECIFIED || heightSpecMode == MeasureSpec.UNSPECIFIED) { 86 throw new RuntimeException("CellLayout cannot have UNSPECIFIED dimensions"); 87 } 88 89 final int count = getChildCount(); 90 for (int i = 0; i < count; i++) { 91 View child = getChildAt(i); 92 PagedViewCellLayout.LayoutParams lp = 93 (PagedViewCellLayout.LayoutParams) child.getLayoutParams(); 94 lp.setup(mCellWidth, mCellHeight, mWidthGap, mHeightGap, 95 getPaddingLeft(), 96 getPaddingTop()); 97 98 int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(lp.width, 99 MeasureSpec.EXACTLY); 100 int childheightMeasureSpec = MeasureSpec.makeMeasureSpec(lp.height, 101 MeasureSpec.EXACTLY); 102 103 child.measure(childWidthMeasureSpec, childheightMeasureSpec); 104 } 105 106 setMeasuredDimension(widthSpecSize, heightSpecSize); 107 } 108 109 @Override onLayout(boolean changed, int l, int t, int r, int b)110 protected void onLayout(boolean changed, int l, int t, int r, int b) { 111 int count = getChildCount(); 112 113 int offsetX = 0; 114 if (mCenterContent && count > 0) { 115 // determine the max width of all the rows and center accordingly 116 int maxRowX = 0; 117 int minRowX = Integer.MAX_VALUE; 118 for (int i = 0; i < count; i++) { 119 View child = getChildAt(i); 120 if (child.getVisibility() != GONE) { 121 PagedViewCellLayout.LayoutParams lp = 122 (PagedViewCellLayout.LayoutParams) child.getLayoutParams(); 123 minRowX = Math.min(minRowX, lp.x); 124 maxRowX = Math.max(maxRowX, lp.x + lp.width); 125 } 126 } 127 int maxRowWidth = maxRowX - minRowX; 128 offsetX = (getMeasuredWidth() - maxRowWidth) / 2; 129 } 130 131 for (int i = 0; i < count; i++) { 132 View child = getChildAt(i); 133 if (child.getVisibility() != GONE) { 134 PagedViewCellLayout.LayoutParams lp = 135 (PagedViewCellLayout.LayoutParams) child.getLayoutParams(); 136 137 int childLeft = offsetX + lp.x; 138 int childTop = lp.y; 139 child.layout(childLeft, childTop, childLeft + lp.width, childTop + lp.height); 140 } 141 } 142 } 143 enableCenteredContent(boolean enabled)144 public void enableCenteredContent(boolean enabled) { 145 mCenterContent = enabled; 146 } 147 148 @Override setChildrenDrawingCacheEnabled(boolean enabled)149 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 150 final int count = getChildCount(); 151 for (int i = 0; i < count; i++) { 152 final View view = getChildAt(i); 153 view.setDrawingCacheEnabled(enabled); 154 // Update the drawing caches 155 if (!view.isHardwareAccelerated()) { 156 view.buildDrawingCache(true); 157 } 158 } 159 } 160 } 161