PagedViewWidget.java revision 099459377a737d885bbd8ac4d52e6884a103b1c7 
1/*
2 * Copyright (C) 2010 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.animation.ObjectAnimator;
20import android.appwidget.AppWidgetProviderInfo;
21import android.content.Context;
22import android.content.pm.PackageManager;
23import android.content.pm.ResolveInfo;
24import android.content.res.Resources;
25import android.content.res.TypedArray;
26import android.graphics.Bitmap;
27import android.graphics.Canvas;
28import android.graphics.Color;
29import android.graphics.Paint;
30import android.graphics.PorterDuff;
31import android.graphics.PorterDuff.Mode;
32import android.graphics.PorterDuffXfermode;
33import android.graphics.Rect;
34import android.graphics.RectF;
35import android.os.Handler;
36import android.os.HandlerThread;
37import android.os.Message;
38import android.util.AttributeSet;
39import android.view.KeyEvent;
40import android.view.MotionEvent;
41import android.view.View;
42import android.widget.Checkable;
43import android.widget.ImageView;
44import android.widget.LinearLayout;
45import android.widget.TextView;
46
47import com.android.launcher.R;
48
49/**
50 * The linear layout used strictly for the widget/wallpaper tab of the customization tray
51 */
52public class PagedViewWidget extends LinearLayout implements Checkable {
53    static final String TAG = "PagedViewWidgetLayout";
54
55    private final Paint mPaint = new Paint();
56    private Bitmap mHolographicOutline;
57    private HolographicOutlineHelper mHolographicOutlineHelper;
58    private ImageView mPreviewImageView;
59    private final RectF mTmpScaleRect = new RectF();
60
61    private String mDimensionsFormatString;
62
63    private int mAlpha = 255;
64    private int mHolographicAlpha;
65
66    private boolean mIsChecked;
67    private ObjectAnimator mCheckedAlphaAnimator;
68    private float mCheckedAlpha = 1.0f;
69    private int mCheckedFadeInDuration;
70    private int mCheckedFadeOutDuration;
71
72    public PagedViewWidget(Context context) {
73        this(context, null);
74    }
75
76    public PagedViewWidget(Context context, AttributeSet attrs) {
77        this(context, attrs, 0);
78    }
79
80    public PagedViewWidget(Context context, AttributeSet attrs, int defStyle) {
81        super(context, attrs, defStyle);
82
83        // Set up fade in/out constants
84        final Resources r = context.getResources();
85        final int alpha = r.getInteger(R.integer.config_dragAppsCustomizeIconFadeAlpha);
86        if (alpha > 0) {
87            mCheckedAlpha = r.getInteger(R.integer.config_dragAppsCustomizeIconFadeAlpha) / 256.0f;
88            mCheckedFadeInDuration =
89                r.getInteger(R.integer.config_dragAppsCustomizeIconFadeInDuration);
90            mCheckedFadeOutDuration =
91                r.getInteger(R.integer.config_dragAppsCustomizeIconFadeOutDuration);
92        }
93        mDimensionsFormatString = r.getString(R.string.widget_dims_format);
94
95        setWillNotDraw(false);
96        setClipToPadding(false);
97    }
98
99    @Override
100    protected void onDetachedFromWindow() {
101        super.onDetachedFromWindow();
102
103        final ImageView image = (ImageView) findViewById(R.id.widget_preview);
104        if (image != null) {
105            FastBitmapDrawable preview = (FastBitmapDrawable) image.getDrawable();
106            if (preview != null && preview.getBitmap() != null) {
107                preview.getBitmap().recycle();
108            }
109            image.setImageDrawable(null);
110        }
111    }
112
113    public void applyFromAppWidgetProviderInfo(AppWidgetProviderInfo info,
114            FastBitmapDrawable preview, int maxWidth, int[] cellSpan,
115            HolographicOutlineHelper holoOutlineHelper) {
116        mHolographicOutlineHelper = holoOutlineHelper;
117        final ImageView image = (ImageView) findViewById(R.id.widget_preview);
118        if (maxWidth > -1) {
119            image.setMaxWidth(maxWidth);
120        }
121        image.setImageDrawable(preview);
122        image.setContentDescription(info.label);
123        mPreviewImageView = image;
124        final TextView name = (TextView) findViewById(R.id.widget_name);
125        name.setText(info.label);
126        final TextView dims = (TextView) findViewById(R.id.widget_dims);
127        if (dims != null) {
128            dims.setText(String.format(mDimensionsFormatString, cellSpan[0], cellSpan[1]));
129        }
130    }
131
132    public void applyFromResolveInfo(PackageManager pm, ResolveInfo info,
133            FastBitmapDrawable preview, HolographicOutlineHelper holoOutlineHelper) {
134        mHolographicOutlineHelper = holoOutlineHelper;
135        CharSequence label = info.loadLabel(pm);
136        final ImageView image = (ImageView) findViewById(R.id.widget_preview);
137        image.setImageDrawable(preview);
138        image.setContentDescription(label);
139        mPreviewImageView = image;
140        final TextView name = (TextView) findViewById(R.id.widget_name);
141        name.setText(label);
142        final TextView dims = (TextView) findViewById(R.id.widget_dims);
143        if (dims != null) {
144            dims.setText(String.format(mDimensionsFormatString, 1, 1));
145        }
146    }
147
148    public void setHolographicOutline(Bitmap holoOutline) {
149        mHolographicOutline = holoOutline;
150        invalidate();
151    }
152
153    @Override
154    public boolean onTouchEvent(MotionEvent event) {
155        // We eat up the touch events here, since the PagedView (which uses the same swiping
156        // touch code as Workspace previously) uses onInterceptTouchEvent() to determine when
157        // the user is scrolling between pages.  This means that if the pages themselves don't
158        // handle touch events, it gets forwarded up to PagedView itself, and it's own
159        // onTouchEvent() handling will prevent further intercept touch events from being called
160        // (it's the same view in that case).  This is not ideal, but to prevent more changes,
161        // we just always mark the touch event as handled.
162        return super.onTouchEvent(event) || true;
163    }
164
165    @Override
166    public boolean onKeyDown(int keyCode, KeyEvent event) {
167        return FocusHelper.handlePagedViewGridLayoutWidgetKeyEvent(this, keyCode, event)
168                || super.onKeyDown(keyCode, event);
169    }
170
171    @Override
172    public boolean onKeyUp(int keyCode, KeyEvent event) {
173        return FocusHelper.handlePagedViewGridLayoutWidgetKeyEvent(this, keyCode, event)
174                || super.onKeyUp(keyCode, event);
175    }
176
177    @Override
178    protected void onDraw(Canvas canvas) {
179        if (mAlpha > 0) {
180            super.onDraw(canvas);
181        }
182
183        // draw any blended overlays
184        if (mHolographicOutline != null && mHolographicAlpha > 0) {
185            // Calculate how much to scale the holographic preview
186            mTmpScaleRect.set(0,0,1,1);
187            mPreviewImageView.getImageMatrix().mapRect(mTmpScaleRect);
188
189            mPaint.setAlpha(mHolographicAlpha);
190            canvas.save();
191            canvas.scale(mTmpScaleRect.right, mTmpScaleRect.bottom);
192            canvas.drawBitmap(mHolographicOutline, mPreviewImageView.getLeft(),
193                    mPreviewImageView.getTop(), mPaint);
194            canvas.restore();
195        }
196    }
197
198    @Override
199    protected boolean onSetAlpha(int alpha) {
200        return true;
201    }
202
203    private void setChildrenAlpha(float alpha) {
204        final int childCount = getChildCount();
205        for (int i = 0; i < childCount; i++) {
206            getChildAt(i).setAlpha(alpha);
207        }
208    }
209    @Override
210    public void setAlpha(float alpha) {
211        final float viewAlpha = mHolographicOutlineHelper.viewAlphaInterpolator(alpha);
212        final float holographicAlpha = mHolographicOutlineHelper.highlightAlphaInterpolator(alpha);
213        int newViewAlpha = (int) (viewAlpha * 255);
214        int newHolographicAlpha = (int) (holographicAlpha * 255);
215        if ((mAlpha != newViewAlpha) || (mHolographicAlpha != newHolographicAlpha)) {
216            mAlpha = newViewAlpha;
217            mHolographicAlpha = newHolographicAlpha;
218            setChildrenAlpha(viewAlpha);
219            super.setAlpha(viewAlpha);
220        }
221    }
222
223    void setChecked(boolean checked, boolean animate) {
224        if (mIsChecked != checked) {
225            mIsChecked = checked;
226
227            float alpha;
228            int duration;
229            if (mIsChecked) {
230                alpha = mCheckedAlpha;
231                duration = mCheckedFadeInDuration;
232            } else {
233                alpha = 1.0f;
234                duration = mCheckedFadeOutDuration;
235            }
236
237            // Initialize the animator
238            if (mCheckedAlphaAnimator != null) {
239                mCheckedAlphaAnimator.cancel();
240            }
241            if (animate) {
242                mCheckedAlphaAnimator = ObjectAnimator.ofFloat(this, "alpha", getAlpha(), alpha);
243                mCheckedAlphaAnimator.setDuration(duration);
244                mCheckedAlphaAnimator.start();
245            } else {
246                setAlpha(alpha);
247            }
248
249            invalidate();
250        }
251    }
252
253    @Override
254    public void setChecked(boolean checked) {
255        setChecked(checked, true);
256    }
257
258    @Override
259    public boolean isChecked() {
260        return mIsChecked;
261    }
262
263    @Override
264    public void toggle() {
265        setChecked(!mIsChecked);
266    }
267}
268