1 /* 2 * Copyright (C) 2015 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.internal.widget; 18 19 import android.annotation.Nullable; 20 import android.content.Context; 21 import android.text.BoringLayout; 22 import android.text.Layout; 23 import android.text.StaticLayout; 24 import android.text.TextUtils; 25 import android.text.method.TransformationMethod; 26 import android.util.AttributeSet; 27 import android.view.RemotableViewMethod; 28 import android.widget.RemoteViews; 29 import android.widget.TextView; 30 31 import com.android.internal.R; 32 33 /** 34 * A TextView that can float around an image on the end. 35 * 36 * @hide 37 */ 38 @RemoteViews.RemoteView 39 public class ImageFloatingTextView extends TextView { 40 41 /** Number of lines from the top to indent */ 42 private int mIndentLines; 43 44 /** Resolved layout direction */ 45 private int mResolvedDirection = LAYOUT_DIRECTION_UNDEFINED; 46 private int mMaxLinesForHeight = -1; 47 private boolean mFirstMeasure = true; 48 private int mLayoutMaxLines = -1; 49 private boolean mBlockLayouts; 50 51 public ImageFloatingTextView(Context context) { 52 this(context, null); 53 } 54 55 public ImageFloatingTextView(Context context, @Nullable AttributeSet attrs) { 56 this(context, attrs, 0); 57 } 58 59 public ImageFloatingTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { 60 this(context, attrs, defStyleAttr, 0); 61 } 62 63 public ImageFloatingTextView(Context context, AttributeSet attrs, int defStyleAttr, 64 int defStyleRes) { 65 super(context, attrs, defStyleAttr, defStyleRes); 66 } 67 68 @Override 69 protected Layout makeSingleLayout(int wantWidth, BoringLayout.Metrics boring, int ellipsisWidth, 70 Layout.Alignment alignment, boolean shouldEllipsize, 71 TextUtils.TruncateAt effectiveEllipsize, boolean useSaved) { 72 TransformationMethod transformationMethod = getTransformationMethod(); 73 CharSequence text = getText(); 74 if (transformationMethod != null) { 75 text = transformationMethod.getTransformation(text, this); 76 } 77 text = text == null ? "" : text; 78 StaticLayout.Builder builder = StaticLayout.Builder.obtain(text, 0, text.length(), 79 getPaint(), wantWidth) 80 .setAlignment(alignment) 81 .setTextDirection(getTextDirectionHeuristic()) 82 .setLineSpacing(getLineSpacingExtra(), getLineSpacingMultiplier()) 83 .setIncludePad(getIncludeFontPadding()) 84 .setBreakStrategy(Layout.BREAK_STRATEGY_HIGH_QUALITY) 85 .setHyphenationFrequency(Layout.HYPHENATION_FREQUENCY_FULL); 86 int maxLines; 87 if (mMaxLinesForHeight > 0) { 88 maxLines = mMaxLinesForHeight; 89 } else { 90 maxLines = getMaxLines() >= 0 ? getMaxLines() : Integer.MAX_VALUE; 91 } 92 builder.setMaxLines(maxLines); 93 mLayoutMaxLines = maxLines; 94 if (shouldEllipsize) { 95 builder.setEllipsize(effectiveEllipsize) 96 .setEllipsizedWidth(ellipsisWidth); 97 } 98 99 // we set the endmargin on the requested number of lines. 100 int endMargin = getContext().getResources().getDimensionPixelSize( 101 R.dimen.notification_content_picture_margin); 102 int[] margins = null; 103 if (mIndentLines > 0) { 104 margins = new int[mIndentLines + 1]; 105 for (int i = 0; i < mIndentLines; i++) { 106 margins[i] = endMargin; 107 } 108 } 109 if (mResolvedDirection == LAYOUT_DIRECTION_RTL) { 110 builder.setIndents(margins, null); 111 } else { 112 builder.setIndents(null, margins); 113 } 114 115 return builder.build(); 116 } 117 118 @Override 119 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 120 int height = MeasureSpec.getSize(heightMeasureSpec); 121 // Lets calculate how many lines the given measurement allows us. 122 int availableHeight = height - mPaddingTop - mPaddingBottom; 123 int maxLines = availableHeight / getLineHeight(); 124 maxLines = Math.max(1, maxLines); 125 if (getMaxLines() > 0) { 126 maxLines = Math.min(getMaxLines(), maxLines); 127 } 128 if (maxLines != mMaxLinesForHeight) { 129 mMaxLinesForHeight = maxLines; 130 if (getLayout() != null && mMaxLinesForHeight != mLayoutMaxLines) { 131 // Invalidate layout. 132 mBlockLayouts = true; 133 setHint(getHint()); 134 mBlockLayouts = false; 135 } 136 } 137 super.onMeasure(widthMeasureSpec, heightMeasureSpec); 138 } 139 140 @Override 141 public void requestLayout() { 142 if (!mBlockLayouts) { 143 super.requestLayout(); 144 } 145 } 146 147 @Override 148 public void onRtlPropertiesChanged(int layoutDirection) { 149 super.onRtlPropertiesChanged(layoutDirection); 150 151 if (layoutDirection != mResolvedDirection && isLayoutDirectionResolved()) { 152 mResolvedDirection = layoutDirection; 153 if (mIndentLines > 0) { 154 // Invalidate layout. 155 setHint(getHint()); 156 } 157 } 158 } 159 160 @RemotableViewMethod 161 public void setHasImage(boolean hasImage) { 162 setNumIndentLines(hasImage ? 2 : 0); 163 } 164 165 /** 166 * @param lines the number of lines at the top that should be indented by indentEnd 167 * @return whether a change was made 168 */ 169 public boolean setNumIndentLines(int lines) { 170 if (mIndentLines != lines) { 171 mIndentLines = lines; 172 // Invalidate layout. 173 setHint(getHint()); 174 return true; 175 } 176 return false; 177 } 178 179 public int getLayoutHeight() { 180 return getLayout().getHeight(); 181 } 182 } 183