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.util.AttributeSet;
26import android.view.RemotableViewMethod;
27import android.widget.RemoteViews;
28import android.widget.TextView;
29
30import com.android.internal.R;
31
32/**
33 * A TextView that can float around an image on the end.
34 *
35 * @hide
36 */
37@RemoteViews.RemoteView
38public class ImageFloatingTextView extends TextView {
39
40    /** Number of lines from the top to indent */
41    private int mIndentLines;
42
43    /** Resolved layout direction */
44    private int mResolvedDirection = LAYOUT_DIRECTION_UNDEFINED;
45
46    public ImageFloatingTextView(Context context) {
47        this(context, null);
48    }
49
50    public ImageFloatingTextView(Context context, @Nullable AttributeSet attrs) {
51        this(context, attrs, 0);
52    }
53
54    public ImageFloatingTextView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
55        this(context, attrs, defStyleAttr, 0);
56    }
57
58    public ImageFloatingTextView(Context context, AttributeSet attrs, int defStyleAttr,
59            int defStyleRes) {
60        super(context, attrs, defStyleAttr, defStyleRes);
61    }
62
63    @Override
64    protected Layout makeSingleLayout(int wantWidth, BoringLayout.Metrics boring, int ellipsisWidth,
65            Layout.Alignment alignment, boolean shouldEllipsize,
66            TextUtils.TruncateAt effectiveEllipsize, boolean useSaved) {
67        CharSequence text = getText() == null ? "" : getText();
68        StaticLayout.Builder builder = StaticLayout.Builder.obtain(text, 0, text.length(),
69                getPaint(), wantWidth)
70                .setAlignment(alignment)
71                .setTextDirection(getTextDirectionHeuristic())
72                .setLineSpacing(getLineSpacingExtra(), getLineSpacingMultiplier())
73                .setIncludePad(getIncludeFontPadding())
74                .setEllipsize(shouldEllipsize ? effectiveEllipsize : null)
75                .setEllipsizedWidth(ellipsisWidth)
76                .setBreakStrategy(Layout.BREAK_STRATEGY_HIGH_QUALITY)
77                .setHyphenationFrequency(Layout.HYPHENATION_FREQUENCY_FULL);
78        // we set the endmargin on the requested number of lines.
79        int endMargin = getContext().getResources().getDimensionPixelSize(
80                R.dimen.notification_content_picture_margin);
81        int[] margins = null;
82        if (mIndentLines > 0) {
83            margins = new int[mIndentLines + 1];
84            for (int i = 0; i < mIndentLines; i++) {
85                margins[i] = endMargin;
86            }
87        }
88        if (mResolvedDirection == LAYOUT_DIRECTION_RTL) {
89            builder.setIndents(margins, null);
90        } else {
91            builder.setIndents(null, margins);
92        }
93
94        return builder.build();
95    }
96
97    @Override
98    public void onRtlPropertiesChanged(int layoutDirection) {
99        super.onRtlPropertiesChanged(layoutDirection);
100
101        if (layoutDirection != mResolvedDirection && isLayoutDirectionResolved()) {
102            mResolvedDirection = layoutDirection;
103            if (mIndentLines > 0) {
104                // Invalidate layout.
105                setHint(getHint());
106            }
107        }
108    }
109
110    @RemotableViewMethod
111    public void setHasImage(boolean hasImage) {
112        setNumIndentLines(hasImage ? 2 : 0);
113    }
114
115    /**
116     * @param lines the number of lines at the top that should be indented by indentEnd
117     * @return whether a change was made
118     */
119    public boolean setNumIndentLines(int lines) {
120        if (mIndentLines != lines) {
121            mIndentLines = lines;
122            // Invalidate layout.
123            setHint(getHint());
124            return true;
125        }
126        return false;
127    }
128}
129