BubbleTextView.java 12.3 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

Joe Onorato's avatar
Joe Onorato committed
17
package com.android.launcher2;
18

19 20
import com.android.launcher.R;

21
import android.content.Context;
22
import android.content.res.Resources;
23
import android.graphics.Bitmap;
24
import android.graphics.Canvas;
25
import android.graphics.Color;
26
import android.graphics.Paint;
27
import android.graphics.Rect;
28
import android.graphics.Region;
29
import android.graphics.Region.Op;
30
import android.graphics.drawable.Drawable;
31
import android.util.AttributeSet;
32
import android.view.KeyEvent;
33
import android.view.MotionEvent;
34
import android.view.View;
35
import android.widget.TextView;
Romain Guy's avatar
Romain Guy committed
36

37 38 39 40 41
/**
 * TextView that draws a bubble behind the text. We cannot use a LineBackgroundSpan
 * because we want to make the bubble taller than the text and TextView's clip is
 * too aggressive.
 */
42
public class BubbleTextView extends TextView implements VisibilityChangedBroadcaster {
43
    static final float CORNER_RADIUS = 4.0f;
Winson Chung's avatar
Winson Chung committed
44 45 46 47 48
    static final float SHADOW_LARGE_RADIUS = 4.0f;
    static final float SHADOW_SMALL_RADIUS = 1.75f;
    static final float SHADOW_Y_OFFSET = 2.0f;
    static final int SHADOW_LARGE_COLOUR = 0xCC000000;
    static final int SHADOW_SMALL_COLOUR = 0xBB000000;
49 50 51
    static final float PADDING_H = 8.0f;
    static final float PADDING_V = 3.0f;

52
    private Paint mPaint;
53
    private float mBubbleColorAlpha;
Winson Chung's avatar
Winson Chung committed
54
    private int mPrevAlpha = -1;
55

56 57 58 59 60 61 62 63 64 65
    private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
    private final Canvas mTempCanvas = new Canvas();
    private final Rect mTempRect = new Rect();
    private boolean mDidInvalidateForPressedState;
    private Bitmap mPressedOrFocusedBackground;
    private int mFocusedOutlineColor;
    private int mFocusedGlowColor;
    private int mPressedOutlineColor;
    private int mPressedGlowColor;

66 67 68
    private boolean mBackgroundSizeChanged;
    private Drawable mBackground;

69 70
    private boolean mStayPressed;

71 72
    private VisibilityChangedListener mOnVisibilityChangedListener;

73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
    public BubbleTextView(Context context) {
        super(context);
        init();
    }

    public BubbleTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public BubbleTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        mBackground = getBackground();

91 92
        final Resources res = getContext().getResources();
        int bubbleColor = res.getColor(R.color.bubble_dark_background);
93
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
94 95
        mPaint.setColor(bubbleColor);
        mBubbleColorAlpha = Color.alpha(bubbleColor) / 255.0f;
96 97 98 99
        mFocusedOutlineColor = res.getColor(R.color.workspace_item_focused_outline_color);
        mFocusedGlowColor = res.getColor(R.color.workspace_item_focused_glow_color);
        mPressedOutlineColor = res.getColor(R.color.workspace_item_pressed_outline_color);
        mPressedGlowColor = res.getColor(R.color.workspace_item_pressed_glow_color);
100 101

        setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
102 103
    }

104 105 106 107 108 109 110 111 112 113
    public void applyFromShortcutInfo(ShortcutInfo info, IconCache iconCache) {
        Bitmap b = info.getIcon(iconCache);

        setCompoundDrawablesWithIntrinsicBounds(null,
                new FastBitmapDrawable(b),
                null, null);
        setText(info.title);
        setTag(info);
    }

114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
    @Override
    protected boolean setFrame(int left, int top, int right, int bottom) {
        if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) {
            mBackgroundSizeChanged = true;
        }
        return super.setFrame(left, top, right, bottom);
    }

    @Override
    protected boolean verifyDrawable(Drawable who) {
        return who == mBackground || super.verifyDrawable(who);
    }

    @Override
    protected void drawableStateChanged() {
129 130 131 132
        if (isPressed()) {
            // In this case, we have already created the pressed outline on ACTION_DOWN,
            // so we just need to do an invalidate to trigger draw
            if (!mDidInvalidateForPressedState) {
133
                setCellLayoutPressedOrFocusedIcon();
134 135 136 137 138
            }
        } else {
            // Otherwise, either clear the pressed/focused background, or create a background
            // for the focused state
            final boolean backgroundEmptyBefore = mPressedOrFocusedBackground == null;
139 140 141
            if (!mStayPressed) {
                mPressedOrFocusedBackground = null;
            }
142
            if (isFocused()) {
143 144 145 146 147 148 149 150
                if (mLayout == null) {
                    // In some cases, we get focus before we have been layed out. Set the
                    // background to null so that it will get created when the view is drawn.
                    mPressedOrFocusedBackground = null;
                } else {
                    mPressedOrFocusedBackground = createGlowingOutline(
                            mTempCanvas, mFocusedGlowColor, mFocusedOutlineColor);
                }
151
                mStayPressed = false;
152
                setCellLayoutPressedOrFocusedIcon();
153 154 155
            }
            final boolean backgroundEmptyNow = mPressedOrFocusedBackground == null;
            if (!backgroundEmptyBefore && backgroundEmptyNow) {
156
                setCellLayoutPressedOrFocusedIcon();
157 158 159
            }
        }

160 161 162 163 164 165 166
        Drawable d = mBackground;
        if (d != null && d.isStateful()) {
            d.setState(getDrawableState());
        }
        super.drawableStateChanged();
    }

167
    /**
168
     * Draw this BubbleTextView into the given Canvas.
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186
     *
     * @param destCanvas the canvas to draw on
     * @param padding the horizontal and vertical padding to use when drawing
     */
    private void drawWithPadding(Canvas destCanvas, int padding) {
        final Rect clipRect = mTempRect;
        getDrawingRect(clipRect);

        // adjust the clip rect so that we don't include the text label
        clipRect.bottom =
            getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V + getLayout().getLineTop(0);

        // Draw the View into the bitmap.
        // The translate of scrollX and scrollY is necessary when drawing TextViews, because
        // they set scrollX and scrollY to large values to achieve centered text
        destCanvas.save();
        destCanvas.translate(-getScrollX() + padding / 2, -getScrollY() + padding / 2);
        destCanvas.clipRect(clipRect, Op.REPLACE);
187
        draw(destCanvas);
188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
        destCanvas.restore();
    }

    /**
     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
     * Responsibility for the bitmap is transferred to the caller.
     */
    private Bitmap createGlowingOutline(Canvas canvas, int outlineColor, int glowColor) {
        final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
        final Bitmap b = Bitmap.createBitmap(
                getWidth() + padding, getHeight() + padding, Bitmap.Config.ARGB_8888);

        canvas.setBitmap(b);
        drawWithPadding(canvas, padding);
        mOutlineHelper.applyExtraThickExpensiveOutlineWithBlur(b, canvas, glowColor, outlineColor);

        return b;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // Call the superclass onTouchEvent first, because sometimes it changes the state to
        // isPressed() on an ACTION_UP
        boolean result = super.onTouchEvent(event);

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                // So that the pressed outline is visible immediately when isPressed() is true,
                // we pre-create it on ACTION_DOWN (it takes a small but perceptible amount of time
                // to create it)
                if (mPressedOrFocusedBackground == null) {
                    mPressedOrFocusedBackground = createGlowingOutline(
                            mTempCanvas, mPressedGlowColor, mPressedOutlineColor);
                }
                // Invalidate so the pressed state is visible, or set a flag so we know that we
                // have to call invalidate as soon as the state is "pressed"
                if (isPressed()) {
                    mDidInvalidateForPressedState = true;
                    invalidate();
                } else {
                    mDidInvalidateForPressedState = false;
                }
                break;
            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                // If we've touched down and up on an item, and it's still not "pressed", then
                // destroy the pressed outline
                if (!isPressed()) {
                    mPressedOrFocusedBackground = null;
                }
                break;
        }
        return result;
    }

243 244 245 246 247 248 249 250 251 252 253 254
    public void setVisibilityChangedListener(VisibilityChangedListener listener) {
        mOnVisibilityChangedListener = listener;
    }

    @Override
    protected void onVisibilityChanged(View changedView, int visibility) {
        if (mOnVisibilityChangedListener != null) {
            mOnVisibilityChangedListener.receiveVisibilityChangedMessage(this);
        }
        super.onVisibilityChanged(changedView, visibility);
    }

255 256 257 258 259
    void setStayPressed(boolean stayPressed) {
        mStayPressed = stayPressed;
        if (!stayPressed) {
            mPressedOrFocusedBackground = null;
        }
260
        setCellLayoutPressedOrFocusedIcon();
261
    }
262

263
    void setCellLayoutPressedOrFocusedIcon() {
264 265 266 267 268 269
        if (getParent() instanceof CellLayoutChildren) {
            CellLayoutChildren parent = (CellLayoutChildren) getParent();
            if (parent != null) {
                CellLayout layout = (CellLayout) parent.getParent();
                layout.setPressedOrFocusedIcon((mPressedOrFocusedBackground != null) ? this : null);
            }
270
        }
271 272
    }

273 274 275
    Bitmap getPressedOrFocusedBackground() {
        return mPressedOrFocusedBackground;
    }
276

277 278 279
    int getPressedOrFocusedBackgroundPadding() {
        return HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS / 2;
    }
Winson Chung's avatar
Winson Chung committed
280

281 282
    @Override
    public void draw(Canvas canvas) {
283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
        final Drawable background = mBackground;
        if (background != null) {
            final int scrollX = mScrollX;
            final int scrollY = mScrollY;

            if (mBackgroundSizeChanged) {
                background.setBounds(0, 0,  mRight - mLeft, mBottom - mTop);
                mBackgroundSizeChanged = false;
            }

            if ((scrollX | scrollY) == 0) {
                background.draw(canvas);
            } else {
                canvas.translate(scrollX, scrollY);
                background.draw(canvas);
                canvas.translate(-scrollX, -scrollY);
299
            }
Winson Chung's avatar
Winson Chung committed
300
        }
301
        // We enhance the shadow by drawing the shadow twice
302
        getPaint().setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
303 304 305
        super.draw(canvas);
        canvas.save(Canvas.CLIP_SAVE_FLAG);
        canvas.clipRect(mScrollX, mScrollY + getExtendedPaddingTop(), mScrollX + getWidth(),
306
                mScrollY + getHeight(), Region.Op.INTERSECT);
307
        getPaint().setShadowLayer(SHADOW_SMALL_RADIUS, 0.0f, 0.0f, SHADOW_SMALL_COLOUR);
308 309
        super.draw(canvas);
        canvas.restore();
310
    }
311 312 313 314

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
315
        if (mBackground != null) mBackground.setCallback(this);
316 317 318 319 320
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
321
        if (mBackground != null) mBackground.setCallback(null);
322
    }
Winson Chung's avatar
Winson Chung committed
323 324 325

    @Override
    protected boolean onSetAlpha(int alpha) {
Winson Chung's avatar
Winson Chung committed
326 327
        if (mPrevAlpha != alpha) {
            mPrevAlpha = alpha;
328
            mPaint.setAlpha((int) (alpha * mBubbleColorAlpha));
Winson Chung's avatar
Winson Chung committed
329 330 331
            super.onSetAlpha(alpha);
        }
        return true;
Winson Chung's avatar
Winson Chung committed
332
    }
333
}