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.Resources;
21import android.content.res.TypedArray;
22import android.graphics.Bitmap;
23import android.graphics.Canvas;
24import android.graphics.Paint;
25import android.graphics.PorterDuff;
26import android.graphics.PorterDuffXfermode;
27import android.graphics.Rect;
28import android.graphics.drawable.Drawable;
29import android.util.AttributeSet;
30import android.util.DisplayMetrics;
31import android.widget.FrameLayout;
32
33import com.android.launcher.R;
34
35public class Cling extends FrameLayout {
36
37    static final String WORKSPACE_CLING_DISMISSED_KEY = "cling.workspace.dismissed";
38    static final String ALLAPPS_CLING_DISMISSED_KEY = "cling.allapps.dismissed";
39    static final String FOLDER_CLING_DISMISSED_KEY = "cling.folder.dismissed";
40
41    private static String WORKSPACE_PORTRAIT = "workspace_portrait";
42    private static String WORKSPACE_LANDSCAPE = "workspace_landscape";
43    private static String ALLAPPS_PORTRAIT = "all_apps_portrait";
44    private static String ALLAPPS_LANDSCAPE = "all_apps_landscape";
45    private static String FOLDER_PORTRAIT = "folder_portrait";
46    private static String FOLDER_LANDSCAPE = "folder_landscape";
47    private static String WORKSPACE_LARGE = "workspace_large";
48    private static String FOLDER_LARGE = "folder_large";
49    private static String ALLAPPS_LARGE = "all_apps_large";
50
51    private Launcher mLauncher;
52    private boolean mIsInitialized;
53    private String mDrawIdentifier;
54    private Drawable mBackground;
55    private Drawable mPunchThroughGraphic;
56    private Drawable mHandTouchGraphic;
57    private int mPunchThroughGraphicCenterRadius;
58    private int mAppIconSize;
59    private int mButtonBarHeight;
60    private float mRevealRadius;
61    private int[] mPositionData;
62
63    private Paint mErasePaint;
64
65    public Cling(Context context) {
66        this(context, null, 0);
67    }
68
69    public Cling(Context context, AttributeSet attrs) {
70        this(context, attrs, 0);
71    }
72
73    public Cling(Context context, AttributeSet attrs, int defStyle) {
74        super(context, attrs, defStyle);
75
76        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Cling, defStyle, 0);
77        mDrawIdentifier = a.getString(R.styleable.Cling_drawIdentifier);
78        a.recycle();
79    }
80
81    void init(Launcher l, int[] positionData) {
82        if (!mIsInitialized) {
83            mLauncher = l;
84            mPositionData = positionData;
85
86            Resources r = getContext().getResources();
87            mPunchThroughGraphic = r.getDrawable(R.drawable.cling);
88            mPunchThroughGraphicCenterRadius =
89                r.getDimensionPixelSize(R.dimen.clingPunchThroughGraphicCenterRadius);
90            mAppIconSize = r.getDimensionPixelSize(R.dimen.app_icon_size);
91            mRevealRadius = mAppIconSize * 1f;
92            mButtonBarHeight = r.getDimensionPixelSize(R.dimen.button_bar_height);
93
94            mErasePaint = new Paint();
95            mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
96            mErasePaint.setColor(0xFFFFFF);
97            mErasePaint.setAlpha(0);
98
99            mIsInitialized = true;
100        }
101    }
102
103    void cleanup() {
104        mBackground = null;
105        mPunchThroughGraphic = null;
106        mHandTouchGraphic = null;
107        mIsInitialized = false;
108    }
109
110    private int[] getPunchThroughPosition() {
111        if (mDrawIdentifier.equals(WORKSPACE_PORTRAIT)) {
112            return new int[]{getMeasuredWidth() / 2, getMeasuredHeight() - (mButtonBarHeight / 2)};
113        } else if (mDrawIdentifier.equals(WORKSPACE_LANDSCAPE)) {
114            return new int[]{getMeasuredWidth() - (mButtonBarHeight / 2), getMeasuredHeight() / 2};
115        } else if (mDrawIdentifier.equals(WORKSPACE_LARGE)) {
116            final float scale = LauncherApplication.getScreenDensity();
117            final int cornerXOffset = (int) (scale * 15);
118            final int cornerYOffset = (int) (scale * 10);
119            return new int[]{getMeasuredWidth() - cornerXOffset, cornerYOffset};
120        } else if (mDrawIdentifier.equals(ALLAPPS_PORTRAIT) ||
121                   mDrawIdentifier.equals(ALLAPPS_LANDSCAPE) ||
122                   mDrawIdentifier.equals(ALLAPPS_LARGE)) {
123            return mPositionData;
124        }
125        return new int[]{-1, -1};
126    }
127
128    @Override
129    public boolean onTouchEvent(android.view.MotionEvent event) {
130        if (mDrawIdentifier.equals(WORKSPACE_PORTRAIT) ||
131            mDrawIdentifier.equals(WORKSPACE_LANDSCAPE) ||
132            mDrawIdentifier.equals(WORKSPACE_LARGE) ||
133            mDrawIdentifier.equals(ALLAPPS_PORTRAIT) ||
134            mDrawIdentifier.equals(ALLAPPS_LANDSCAPE) ||
135            mDrawIdentifier.equals(ALLAPPS_LARGE)) {
136            int[] pos = getPunchThroughPosition();
137            double diff = Math.sqrt(Math.pow(event.getX() - pos[0], 2) +
138                    Math.pow(event.getY() - pos[1], 2));
139            if (diff < mRevealRadius) {
140                return false;
141            }
142        } else if (mDrawIdentifier.equals(FOLDER_PORTRAIT) ||
143                   mDrawIdentifier.equals(FOLDER_LANDSCAPE) ||
144                   mDrawIdentifier.equals(FOLDER_LARGE)) {
145            Folder f = mLauncher.getWorkspace().getOpenFolder();
146            if (f != null) {
147                Rect r = new Rect();
148                f.getHitRect(r);
149                if (r.contains((int) event.getX(), (int) event.getY())) {
150                    return false;
151                }
152            }
153        }
154        return true;
155    };
156
157    @Override
158    protected void dispatchDraw(Canvas canvas) {
159        if (mIsInitialized) {
160            DisplayMetrics metrics = new DisplayMetrics();
161            mLauncher.getWindowManager().getDefaultDisplay().getMetrics(metrics);
162
163            // Initialize the draw buffer (to allow punching through)
164            Bitmap b = Bitmap.createBitmap(getMeasuredWidth(), getMeasuredHeight(),
165                    Bitmap.Config.ARGB_8888);
166            Canvas c = new Canvas(b);
167
168            // Draw the background
169            if (mBackground == null) {
170                if (mDrawIdentifier.equals(WORKSPACE_PORTRAIT) ||
171                    mDrawIdentifier.equals(WORKSPACE_LANDSCAPE) ||
172                    mDrawIdentifier.equals(WORKSPACE_LARGE)) {
173                    mBackground = getResources().getDrawable(R.drawable.bg_cling1);
174                } else if (mDrawIdentifier.equals(ALLAPPS_PORTRAIT) ||
175                        mDrawIdentifier.equals(ALLAPPS_LANDSCAPE) ||
176                        mDrawIdentifier.equals(ALLAPPS_LARGE)) {
177                    mBackground = getResources().getDrawable(R.drawable.bg_cling2);
178                } else if (mDrawIdentifier.equals(FOLDER_PORTRAIT) ||
179                        mDrawIdentifier.equals(FOLDER_LANDSCAPE)) {
180                    mBackground = getResources().getDrawable(R.drawable.bg_cling3);
181                } else if (mDrawIdentifier.equals(FOLDER_LARGE)) {
182                    mBackground = getResources().getDrawable(R.drawable.bg_cling4);
183                }
184            }
185            if (mBackground != null) {
186                mBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight());
187                mBackground.draw(c);
188            } else {
189                c.drawColor(0x99000000);
190            }
191
192            int cx = -1;
193            int cy = -1;
194            float scale = mRevealRadius / mPunchThroughGraphicCenterRadius;
195            int dw = (int) (scale * mPunchThroughGraphic.getIntrinsicWidth());
196            int dh = (int) (scale * mPunchThroughGraphic.getIntrinsicHeight());
197
198            // Determine where to draw the punch through graphic
199            int[] pos = getPunchThroughPosition();
200            cx = pos[0];
201            cy = pos[1];
202            if (cx > -1 && cy > -1) {
203                c.drawCircle(cx, cy, mRevealRadius, mErasePaint);
204                mPunchThroughGraphic.setBounds(cx - dw/2, cy - dh/2, cx + dw/2, cy + dh/2);
205                mPunchThroughGraphic.draw(c);
206            }
207
208            // Draw the hand graphic in All Apps
209            if (mDrawIdentifier.equals(ALLAPPS_PORTRAIT) ||
210                mDrawIdentifier.equals(ALLAPPS_LANDSCAPE) ||
211                mDrawIdentifier.equals(ALLAPPS_LARGE)) {
212                if (mHandTouchGraphic == null) {
213                    mHandTouchGraphic = getResources().getDrawable(R.drawable.hand);
214                }
215                int offset = mAppIconSize / 4;
216                mHandTouchGraphic.setBounds(cx + offset, cy + offset,
217                        cx + mHandTouchGraphic.getIntrinsicWidth() + offset,
218                        cy + mHandTouchGraphic.getIntrinsicHeight() + offset);
219                mHandTouchGraphic.draw(c);
220            }
221
222            canvas.drawBitmap(b, 0, 0, null);
223            c.setBitmap(null);
224            b = null;
225        }
226
227        // Draw the rest of the cling
228        super.dispatchDraw(canvas);
229    };
230}
231