1/*
2 * Copyright (C) 2008 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.Resources;
21import android.graphics.Bitmap;
22import android.graphics.Canvas;
23import android.graphics.Rect;
24import android.graphics.Region;
25import android.graphics.Region.Op;
26import android.graphics.drawable.Drawable;
27import android.util.AttributeSet;
28import android.view.MotionEvent;
29import android.widget.TextView;
30
31/**
32 * TextView that draws a bubble behind the text. We cannot use a LineBackgroundSpan
33 * because we want to make the bubble taller than the text and TextView's clip is
34 * too aggressive.
35 */
36public class BubbleTextView extends TextView {
37    static final float CORNER_RADIUS = 4.0f;
38    static final float SHADOW_LARGE_RADIUS = 4.0f;
39    static final float SHADOW_SMALL_RADIUS = 1.75f;
40    static final float SHADOW_Y_OFFSET = 2.0f;
41    static final int SHADOW_LARGE_COLOUR = 0xDD000000;
42    static final int SHADOW_SMALL_COLOUR = 0xCC000000;
43    static final float PADDING_H = 8.0f;
44    static final float PADDING_V = 3.0f;
45
46    private int mPrevAlpha = -1;
47
48    private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
49    private final Canvas mTempCanvas = new Canvas();
50    private final Rect mTempRect = new Rect();
51    private boolean mDidInvalidateForPressedState;
52    private Bitmap mPressedOrFocusedBackground;
53    private int mFocusedOutlineColor;
54    private int mFocusedGlowColor;
55    private int mPressedOutlineColor;
56    private int mPressedGlowColor;
57
58    private boolean mBackgroundSizeChanged;
59    private Drawable mBackground;
60
61    private boolean mStayPressed;
62    private CheckLongPressHelper mLongPressHelper;
63
64    public BubbleTextView(Context context) {
65        super(context);
66        init();
67    }
68
69    public BubbleTextView(Context context, AttributeSet attrs) {
70        super(context, attrs);
71        init();
72    }
73
74    public BubbleTextView(Context context, AttributeSet attrs, int defStyle) {
75        super(context, attrs, defStyle);
76        init();
77    }
78
79    private void init() {
80        mLongPressHelper = new CheckLongPressHelper(this);
81        mBackground = getBackground();
82
83        final Resources res = getContext().getResources();
84        mFocusedOutlineColor = mFocusedGlowColor = mPressedOutlineColor = mPressedGlowColor =
85            res.getColor(android.R.color.holo_blue_light);
86
87        setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
88    }
89
90    public void applyFromShortcutInfo(ShortcutInfo info, IconCache iconCache) {
91        Bitmap b = info.getIcon(iconCache);
92
93        setCompoundDrawablesWithIntrinsicBounds(null,
94                new FastBitmapDrawable(b),
95                null, null);
96        setText(info.title);
97        setTag(info);
98    }
99
100    @Override
101    protected boolean setFrame(int left, int top, int right, int bottom) {
102        if (getLeft() != left || getRight() != right || getTop() != top || getBottom() != bottom) {
103            mBackgroundSizeChanged = true;
104        }
105        return super.setFrame(left, top, right, bottom);
106    }
107
108    @Override
109    protected boolean verifyDrawable(Drawable who) {
110        return who == mBackground || super.verifyDrawable(who);
111    }
112
113    @Override
114    public void setTag(Object tag) {
115        if (tag != null) {
116            LauncherModel.checkItemInfo((ItemInfo) tag);
117        }
118        super.setTag(tag);
119    }
120
121    @Override
122    protected void drawableStateChanged() {
123        if (isPressed()) {
124            // In this case, we have already created the pressed outline on ACTION_DOWN,
125            // so we just need to do an invalidate to trigger draw
126            if (!mDidInvalidateForPressedState) {
127                setCellLayoutPressedOrFocusedIcon();
128            }
129        } else {
130            // Otherwise, either clear the pressed/focused background, or create a background
131            // for the focused state
132            final boolean backgroundEmptyBefore = mPressedOrFocusedBackground == null;
133            if (!mStayPressed) {
134                mPressedOrFocusedBackground = null;
135            }
136            if (isFocused()) {
137                if (getLayout() == null) {
138                    // In some cases, we get focus before we have been layed out. Set the
139                    // background to null so that it will get created when the view is drawn.
140                    mPressedOrFocusedBackground = null;
141                } else {
142                    mPressedOrFocusedBackground = createGlowingOutline(
143                            mTempCanvas, mFocusedGlowColor, mFocusedOutlineColor);
144                }
145                mStayPressed = false;
146                setCellLayoutPressedOrFocusedIcon();
147            }
148            final boolean backgroundEmptyNow = mPressedOrFocusedBackground == null;
149            if (!backgroundEmptyBefore && backgroundEmptyNow) {
150                setCellLayoutPressedOrFocusedIcon();
151            }
152        }
153
154        Drawable d = mBackground;
155        if (d != null && d.isStateful()) {
156            d.setState(getDrawableState());
157        }
158        super.drawableStateChanged();
159    }
160
161    /**
162     * Draw this BubbleTextView into the given Canvas.
163     *
164     * @param destCanvas the canvas to draw on
165     * @param padding the horizontal and vertical padding to use when drawing
166     */
167    private void drawWithPadding(Canvas destCanvas, int padding) {
168        final Rect clipRect = mTempRect;
169        getDrawingRect(clipRect);
170
171        // adjust the clip rect so that we don't include the text label
172        clipRect.bottom =
173            getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V + getLayout().getLineTop(0);
174
175        // Draw the View into the bitmap.
176        // The translate of scrollX and scrollY is necessary when drawing TextViews, because
177        // they set scrollX and scrollY to large values to achieve centered text
178        destCanvas.save();
179        destCanvas.scale(getScaleX(), getScaleY(),
180                (getWidth() + padding) / 2, (getHeight() + padding) / 2);
181        destCanvas.translate(-getScrollX() + padding / 2, -getScrollY() + padding / 2);
182        destCanvas.clipRect(clipRect, Op.REPLACE);
183        draw(destCanvas);
184        destCanvas.restore();
185    }
186
187    /**
188     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
189     * Responsibility for the bitmap is transferred to the caller.
190     */
191    private Bitmap createGlowingOutline(Canvas canvas, int outlineColor, int glowColor) {
192        final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
193        final Bitmap b = Bitmap.createBitmap(
194                getWidth() + padding, getHeight() + padding, Bitmap.Config.ARGB_8888);
195
196        canvas.setBitmap(b);
197        drawWithPadding(canvas, padding);
198        mOutlineHelper.applyExtraThickExpensiveOutlineWithBlur(b, canvas, glowColor, outlineColor);
199        canvas.setBitmap(null);
200
201        return b;
202    }
203
204    @Override
205    public boolean onTouchEvent(MotionEvent event) {
206        // Call the superclass onTouchEvent first, because sometimes it changes the state to
207        // isPressed() on an ACTION_UP
208        boolean result = super.onTouchEvent(event);
209
210        switch (event.getAction()) {
211            case MotionEvent.ACTION_DOWN:
212                // So that the pressed outline is visible immediately when isPressed() is true,
213                // we pre-create it on ACTION_DOWN (it takes a small but perceptible amount of time
214                // to create it)
215                if (mPressedOrFocusedBackground == null) {
216                    mPressedOrFocusedBackground = createGlowingOutline(
217                            mTempCanvas, mPressedGlowColor, mPressedOutlineColor);
218                }
219                // Invalidate so the pressed state is visible, or set a flag so we know that we
220                // have to call invalidate as soon as the state is "pressed"
221                if (isPressed()) {
222                    mDidInvalidateForPressedState = true;
223                    setCellLayoutPressedOrFocusedIcon();
224                } else {
225                    mDidInvalidateForPressedState = false;
226                }
227
228                mLongPressHelper.postCheckForLongPress();
229                break;
230            case MotionEvent.ACTION_CANCEL:
231            case MotionEvent.ACTION_UP:
232                // If we've touched down and up on an item, and it's still not "pressed", then
233                // destroy the pressed outline
234                if (!isPressed()) {
235                    mPressedOrFocusedBackground = null;
236                }
237
238                mLongPressHelper.cancelLongPress();
239                break;
240        }
241        return result;
242    }
243
244    void setStayPressed(boolean stayPressed) {
245        mStayPressed = stayPressed;
246        if (!stayPressed) {
247            mPressedOrFocusedBackground = null;
248        }
249        setCellLayoutPressedOrFocusedIcon();
250    }
251
252    void setCellLayoutPressedOrFocusedIcon() {
253        if (getParent() instanceof ShortcutAndWidgetContainer) {
254            ShortcutAndWidgetContainer parent = (ShortcutAndWidgetContainer) getParent();
255            if (parent != null) {
256                CellLayout layout = (CellLayout) parent.getParent();
257                layout.setPressedOrFocusedIcon((mPressedOrFocusedBackground != null) ? this : null);
258            }
259        }
260    }
261
262    void clearPressedOrFocusedBackground() {
263        mPressedOrFocusedBackground = null;
264        setCellLayoutPressedOrFocusedIcon();
265    }
266
267    Bitmap getPressedOrFocusedBackground() {
268        return mPressedOrFocusedBackground;
269    }
270
271    int getPressedOrFocusedBackgroundPadding() {
272        return HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS / 2;
273    }
274
275    @Override
276    public void draw(Canvas canvas) {
277        final Drawable background = mBackground;
278        if (background != null) {
279            final int scrollX = getScrollX();
280            final int scrollY = getScrollY();
281
282            if (mBackgroundSizeChanged) {
283                background.setBounds(0, 0,  getRight() - getLeft(), getBottom() - getTop());
284                mBackgroundSizeChanged = false;
285            }
286
287            if ((scrollX | scrollY) == 0) {
288                background.draw(canvas);
289            } else {
290                canvas.translate(scrollX, scrollY);
291                background.draw(canvas);
292                canvas.translate(-scrollX, -scrollY);
293            }
294        }
295
296        // If text is transparent, don't draw any shadow
297        if (getCurrentTextColor() == getResources().getColor(android.R.color.transparent)) {
298            getPaint().clearShadowLayer();
299            super.draw(canvas);
300            return;
301        }
302
303        // We enhance the shadow by drawing the shadow twice
304        getPaint().setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
305        super.draw(canvas);
306        canvas.save(Canvas.CLIP_SAVE_FLAG);
307        canvas.clipRect(getScrollX(), getScrollY() + getExtendedPaddingTop(),
308                getScrollX() + getWidth(),
309                getScrollY() + getHeight(), Region.Op.INTERSECT);
310        getPaint().setShadowLayer(SHADOW_SMALL_RADIUS, 0.0f, 0.0f, SHADOW_SMALL_COLOUR);
311        super.draw(canvas);
312        canvas.restore();
313    }
314
315    @Override
316    protected void onAttachedToWindow() {
317        super.onAttachedToWindow();
318        if (mBackground != null) mBackground.setCallback(this);
319    }
320
321    @Override
322    protected void onDetachedFromWindow() {
323        super.onDetachedFromWindow();
324        if (mBackground != null) mBackground.setCallback(null);
325    }
326
327    @Override
328    protected boolean onSetAlpha(int alpha) {
329        if (mPrevAlpha != alpha) {
330            mPrevAlpha = alpha;
331            super.onSetAlpha(alpha);
332        }
333        return true;
334    }
335
336    @Override
337    public void cancelLongPress() {
338        super.cancelLongPress();
339
340        mLongPressHelper.cancelLongPress();
341    }
342}
343