1/*
2 * Copyright (C) 2011 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.launcher2;
18
19import android.content.Context;
20import android.content.res.TypedArray;
21import android.graphics.Bitmap;
22import android.graphics.Canvas;
23import android.graphics.Paint;
24import android.graphics.PorterDuff;
25import android.graphics.Rect;
26import android.graphics.drawable.Drawable;
27import android.util.AttributeSet;
28import android.widget.TextView;
29
30import com.android.launcher.R;
31
32/**
33 * This class adds a stroke to the generic TextView allowing the text to stand out better against
34 * the background (ie. in the AllApps button).
35 */
36public class StrokedTextView extends TextView {
37    private final Canvas mCanvas = new Canvas();
38    private final Paint mPaint = new Paint();
39    private Bitmap mCache;
40    private boolean mUpdateCachedBitmap;
41    private int mStrokeColor;
42    private float mStrokeWidth;
43    private int mTextColor;
44
45    public StrokedTextView(Context context) {
46        super(context);
47        init(context, null, 0);
48    }
49
50    public StrokedTextView(Context context, AttributeSet attrs) {
51        super(context, attrs);
52        init(context, attrs, 0);
53    }
54
55    public StrokedTextView(Context context, AttributeSet attrs, int defStyle) {
56        super(context, attrs, defStyle);
57        init(context, attrs, defStyle);
58    }
59
60    private void init(Context context, AttributeSet attrs, int defStyle) {
61        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.StrokedTextView,
62                defStyle, 0);
63        mStrokeColor = a.getColor(R.styleable.StrokedTextView_strokeColor, 0xFF000000);
64        mStrokeWidth = a.getFloat(R.styleable.StrokedTextView_strokeWidth, 0.0f);
65        mTextColor = a.getColor(R.styleable.StrokedTextView_strokeTextColor, 0xFFFFFFFF);
66        a.recycle();
67        mUpdateCachedBitmap = true;
68
69        // Setup the text paint
70        mPaint.setAntiAlias(true);
71        mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
72    }
73
74    protected void onTextChanged(CharSequence text, int start, int before, int after) {
75        super.onTextChanged(text, start, before, after);
76        mUpdateCachedBitmap = true;
77    }
78
79    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
80        super.onSizeChanged(w, h, oldw, oldh);
81        if (w > 0 && h > 0) {
82            mUpdateCachedBitmap = true;
83            mCache = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
84        } else {
85            mCache = null;
86        }
87    }
88
89    protected void onDraw(Canvas canvas) {
90        if (mCache != null) {
91            if (mUpdateCachedBitmap) {
92                final int gap = getCompoundDrawablePadding();
93                final int w = getMeasuredWidth();
94                final int h = getMeasuredHeight();
95                final String text = getText().toString();
96                final Rect textBounds = new Rect();
97                final Paint textPaint = getPaint();
98                final int textWidth = (int) textPaint.measureText(text);
99                textPaint.getTextBounds("x", 0, 1, textBounds);
100
101                // Clear the old cached image
102                mCanvas.setBitmap(mCache);
103                mCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
104
105                // Draw the drawable
106                final int drawableLeft = getPaddingLeft();
107                final int drawableTop = getPaddingTop();
108                final Drawable[] drawables = getCompoundDrawables();
109                for (int i = 0; i < drawables.length; ++i) {
110                    if (drawables[i] != null) {
111                        drawables[i].setBounds(drawableLeft, drawableTop,
112                                drawableLeft + drawables[i].getIntrinsicWidth(),
113                                drawableTop + drawables[i].getIntrinsicHeight());
114                        drawables[i].draw(mCanvas);
115                    }
116                }
117
118                final int left = w - getPaddingRight() - textWidth;
119                final int bottom = (h + textBounds.height()) / 2;
120
121                // Draw the outline of the text
122                mPaint.setStrokeWidth(mStrokeWidth);
123                mPaint.setColor(mStrokeColor);
124                mPaint.setTextSize(getTextSize());
125                mCanvas.drawText(text, left, bottom, mPaint);
126
127                // Draw the text itself
128                mPaint.setStrokeWidth(0);
129                mPaint.setColor(mTextColor);
130                mCanvas.drawText(text, left, bottom, mPaint);
131
132                mUpdateCachedBitmap = false;
133            }
134            canvas.drawBitmap(mCache, 0, 0, mPaint);
135        } else {
136            super.onDraw(canvas);
137        }
138    }
139}
140