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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 package org.chromium.chrome.browser.ntp; |
| 6 |
| 7 import android.content.Context; |
| 8 import android.content.res.Resources; |
| 9 import android.graphics.Canvas; |
| 10 import android.graphics.drawable.Drawable; |
| 11 import android.util.AttributeSet; |
| 12 import android.view.View; |
| 13 import android.widget.FrameLayout; |
| 14 |
| 15 import com.google.android.apps.chrome.R; |
| 16 |
| 17 import org.chromium.base.ApiCompatibilityUtils; |
| 18 |
| 19 /** |
| 20 * A layout that arranges most visited items in a grid. All items must be the sa
me size. |
| 21 */ |
| 22 public class MostVisitedLayout extends FrameLayout { |
| 23 |
| 24 private int mHorizontalSpacing; |
| 25 private int mVerticalSpacing; |
| 26 private int mTwoColumnMinWidth; |
| 27 private int mThreeColumnMinWidth; |
| 28 |
| 29 /** |
| 30 * The ideal width of a child. The children may need be stretched or shrunk
a bit to fill the |
| 31 * available width. |
| 32 */ |
| 33 private int mDefaultChildWidth; |
| 34 |
| 35 private Drawable mEmptyTileDrawable; |
| 36 private int mNumEmptyTiles; |
| 37 private int mEmptyTileTop; |
| 38 private int mFirstEmptyTileLeft; |
| 39 |
| 40 /** |
| 41 * @param context The view context in which this item will be shown. |
| 42 * @param attrs The attributes of the XML tag that is inflating the view. |
| 43 */ |
| 44 public MostVisitedLayout(Context context, AttributeSet attrs) { |
| 45 super(context, attrs); |
| 46 setWillNotDraw(false); |
| 47 |
| 48 Resources res = getResources(); |
| 49 mHorizontalSpacing = res.getDimensionPixelOffset(R.dimen.most_visited_sp
acing); |
| 50 mVerticalSpacing = mHorizontalSpacing; |
| 51 mDefaultChildWidth = res.getDimensionPixelSize(R.dimen.most_visited_tile
_width); |
| 52 mTwoColumnMinWidth = res.getDimensionPixelOffset(R.dimen.most_visited_tw
o_column_min_width); |
| 53 mThreeColumnMinWidth = res.getDimensionPixelOffset( |
| 54 R.dimen.most_visited_three_column_min_width); |
| 55 } |
| 56 |
| 57 @Override |
| 58 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 59 // Determine the number of columns in the grid. |
| 60 final int totalWidth = MeasureSpec.getSize(widthMeasureSpec); |
| 61 int childWidth = mDefaultChildWidth; |
| 62 int childWidthWithSpacing = childWidth + mHorizontalSpacing; |
| 63 |
| 64 int numColumns; |
| 65 if (totalWidth + mHorizontalSpacing >= 3 * childWidthWithSpacing) { |
| 66 numColumns = 3; |
| 67 } else if (totalWidth < mTwoColumnMinWidth) { |
| 68 numColumns = 1; |
| 69 } else { |
| 70 numColumns = totalWidth < mThreeColumnMinWidth ? 2 : 3; |
| 71 |
| 72 // Resize the tiles to make them fill the entire available width. |
| 73 childWidthWithSpacing = Math.max(mHorizontalSpacing, |
| 74 (totalWidth + mHorizontalSpacing) / numColumns); |
| 75 childWidth = childWidthWithSpacing - mHorizontalSpacing; |
| 76 } |
| 77 |
| 78 int childCount = getChildCount(); |
| 79 int childHeight = 0; |
| 80 if (childCount > 0) { |
| 81 // Measure the children. |
| 82 int childWidthSpec = MeasureSpec.makeMeasureSpec(childWidth, Measure
Spec.EXACTLY); |
| 83 int childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNS
PECIFIED); |
| 84 for (int i = 0; i < childCount; i++) { |
| 85 getChildAt(i).measure(childWidthSpec, childHeightSpec); |
| 86 } |
| 87 childHeight = getChildAt(0).getMeasuredHeight(); |
| 88 } |
| 89 |
| 90 // Arrange the children in a grid. |
| 91 int childStart = 0; |
| 92 int childTop = 0; |
| 93 int column = 0; |
| 94 boolean isRtl = ApiCompatibilityUtils.isLayoutRtl(this); |
| 95 for (int i = 0; i < childCount; i++) { |
| 96 View child = getChildAt(i); |
| 97 MarginLayoutParams layoutParams = (MarginLayoutParams) child.getLayo
utParams(); |
| 98 layoutParams.setMargins(isRtl ? 0 : childStart, childTop, |
| 99 isRtl ? childStart : 0, 0); |
| 100 child.setLayoutParams(layoutParams); |
| 101 column++; |
| 102 if (column == numColumns) { |
| 103 column = 0; |
| 104 childStart = 0; |
| 105 childTop += childHeight + mVerticalSpacing; |
| 106 } else { |
| 107 childStart += childWidthWithSpacing; |
| 108 } |
| 109 } |
| 110 |
| 111 // Fill the rest of the current row with empty tiles. |
| 112 if (column != 0) { |
| 113 mNumEmptyTiles = numColumns - column; |
| 114 mEmptyTileTop = childTop + getPaddingTop(); |
| 115 mFirstEmptyTileLeft = isRtl ? 0 : childStart; |
| 116 } else { |
| 117 mNumEmptyTiles = 0; |
| 118 } |
| 119 |
| 120 int numRows = (childCount + mNumEmptyTiles) / numColumns; |
| 121 int totalHeight = getPaddingTop() + getPaddingBottom() + numRows * child
Height |
| 122 + (numRows - 1) * mVerticalSpacing; |
| 123 |
| 124 int gridWidth = numColumns * childWidthWithSpacing - mHorizontalSpacing; |
| 125 setMeasuredDimension(gridWidth, resolveSize(totalHeight, heightMeasureSp
ec)); |
| 126 } |
| 127 |
| 128 @Override |
| 129 protected void onDraw(Canvas canvas) { |
| 130 super.onDraw(canvas); |
| 131 if (mNumEmptyTiles == 0 || getChildCount() == 0) return; |
| 132 |
| 133 // Draw empty tiles. |
| 134 if (mEmptyTileDrawable == null) { |
| 135 mEmptyTileDrawable = ApiCompatibilityUtils.getDrawable( |
| 136 getResources(), R.drawable.most_visited_item_empty); |
| 137 } |
| 138 int tileLeft = mFirstEmptyTileLeft; |
| 139 int tileWidth = getChildAt(0).getMeasuredWidth(); |
| 140 int tileHeight = getChildAt(0).getMeasuredHeight(); |
| 141 for (int i = 0; i < mNumEmptyTiles; i++) { |
| 142 mEmptyTileDrawable.setBounds( |
| 143 tileLeft, |
| 144 mEmptyTileTop, |
| 145 tileLeft + tileWidth, |
| 146 mEmptyTileTop + tileHeight); |
| 147 mEmptyTileDrawable.draw(canvas); |
| 148 tileLeft += tileWidth + mHorizontalSpacing; |
| 149 } |
| 150 } |
| 151 } |
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