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
17package com.android.internal.widget;
18
19import android.annotation.Nullable;
20import android.content.Context;
21import android.text.BoringLayout;
22import android.text.Layout;
23import android.text.StaticLayout;
24import android.text.TextUtils;
25import android.text.method.TransformationMethod;
26import android.util.AttributeSet;
27import android.view.RemotableViewMethod;
28import android.widget.RemoteViews;
29import android.widget.TextView;
30
31import 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
39public 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