DeleteDropTarget.java revision 201bc828d5a0078f505e8e37152156a0cb43c10a 
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.animation.ObjectAnimator;
20import android.content.Context;
21import android.content.res.Configuration;
22import android.content.res.Resources;
23import android.graphics.Color;
24import android.graphics.PorterDuff;
25import android.graphics.PorterDuffColorFilter;
26import android.util.AttributeSet;
27import android.view.View;
28import android.view.ViewGroup;
29import android.widget.TextView;
30
31import com.android.launcher.R;
32
33public class DeleteDropTarget extends ButtonDropTarget {
34
35    private TextView mText;
36    private int mHoverColor = 0xFFFF0000;
37
38    public DeleteDropTarget(Context context, AttributeSet attrs) {
39        this(context, attrs, 0);
40    }
41
42    public DeleteDropTarget(Context context, AttributeSet attrs, int defStyle) {
43        super(context, attrs, defStyle);
44    }
45
46    @Override
47    protected void onFinishInflate() {
48        super.onFinishInflate();
49
50        // Get the drawable
51        mText = (TextView) findViewById(R.id.delete_target_text);
52
53        // Get the hover color
54        Resources r = getResources();
55        mHoverColor = r.getColor(R.color.delete_target_hover_tint);
56        mHoverPaint.setColorFilter(new PorterDuffColorFilter(
57                mHoverColor, PorterDuff.Mode.SRC_ATOP));
58        setBackgroundColor(mHoverColor);
59        getBackground().setAlpha(0);
60
61        // Remove the text in the Phone UI in landscape
62        int orientation = getResources().getConfiguration().orientation;
63        if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
64            if (!LauncherApplication.isScreenLarge()) {
65                mText.setText("");
66            }
67        }
68    }
69
70    private boolean isAllAppsApplication(DragSource source, Object info) {
71        return (source instanceof AppsCustomizePagedView) && (info instanceof ApplicationInfo);
72    }
73    private boolean isAllAppsWidget(DragSource source, Object info) {
74        return (source instanceof AppsCustomizePagedView) && (info instanceof PendingAddWidgetInfo);
75    }
76    private boolean isWorkspaceApplication(DragObject d) {
77        return (d.dragSource instanceof Workspace) && (d.dragInfo instanceof ShortcutInfo);
78    }
79    private boolean isWorkspaceWidget(DragObject d) {
80        return (d.dragSource instanceof Workspace) && (d.dragInfo instanceof LauncherAppWidgetInfo);
81    }
82    private boolean isWorkspaceFolder(DragObject d) {
83        return (d.dragSource instanceof Workspace) && (d.dragInfo instanceof FolderInfo);
84    }
85
86    @Override
87    public boolean acceptDrop(DragObject d) {
88        // We can remove everything including App shortcuts, folders, widgets, etc.
89        return true;
90    }
91
92    @Override
93    public void onDragStart(DragSource source, Object info, int dragAction) {
94        boolean isVisible = true;
95        boolean isUninstall = false;
96
97        // If we are dragging a widget from AppsCustomize, hide the delete target
98        if (isAllAppsWidget(source, info)) {
99            isVisible = false;
100        }
101
102        // If we are dragging an application from AppsCustomize, only show the control if we can
103        // delete the app (it was downloaded), and rename the string to "uninstall" in such a case
104        if (isAllAppsApplication(source, info)) {
105            ApplicationInfo appInfo = (ApplicationInfo) info;
106            if ((appInfo.flags & ApplicationInfo.DOWNLOADED_FLAG) != 0) {
107                isUninstall = true;
108            } else {
109                isVisible = false;
110            }
111        }
112
113        mActive = isVisible;
114        setVisibility(isVisible ? View.VISIBLE : View.GONE);
115        if (mText.getText().length() > 0) {
116            mText.setText(isUninstall ? R.string.delete_target_uninstall_label
117                : R.string.delete_target_label);
118        }
119    }
120
121    @Override
122    public void onDragEnd() {
123        super.onDragEnd();
124        mActive = false;
125    }
126
127    public void onDragEnter(DragObject d) {
128        super.onDragEnter(d);
129
130        ObjectAnimator anim = ObjectAnimator.ofInt(getBackground(), "alpha",
131                Color.alpha(mHoverColor));
132        anim.setDuration(mTransitionDuration);
133        anim.start();
134    }
135
136    public void onDragExit(DragObject d) {
137        super.onDragExit(d);
138
139        ObjectAnimator anim = ObjectAnimator.ofInt(getBackground(), "alpha", 0);
140        anim.setDuration(mTransitionDuration);
141        anim.start();
142    }
143
144    public void onDrop(DragObject d) {
145        ItemInfo item = (ItemInfo) d.dragInfo;
146
147        if (isAllAppsApplication(d.dragSource, item)) {
148            // Uninstall the application if it is being dragged from AppsCustomize
149            mLauncher.startApplicationUninstallActivity((ApplicationInfo) item);
150        } else if (isWorkspaceApplication(d)) {
151            LauncherModel.deleteItemFromDatabase(mLauncher, item);
152        } else if (isWorkspaceFolder(d)) {
153            // Remove the folder from the workspace and delete the contents from launcher model
154            FolderInfo folderInfo = (FolderInfo) item;
155            mLauncher.removeFolder(folderInfo);
156            LauncherModel.deleteFolderContentsFromDatabase(mLauncher, folderInfo);
157        } else if (isWorkspaceWidget(d)) {
158            // Remove the widget from the workspace
159            mLauncher.removeAppWidget((LauncherAppWidgetInfo) item);
160            LauncherModel.deleteItemFromDatabase(mLauncher, item);
161
162            final LauncherAppWidgetInfo launcherAppWidgetInfo = (LauncherAppWidgetInfo) item;
163            final LauncherAppWidgetHost appWidgetHost = mLauncher.getAppWidgetHost();
164            if (appWidgetHost != null) {
165                // Deleting an app widget ID is a void call but writes to disk before returning
166                // to the caller...
167                new Thread("deleteAppWidgetId") {
168                    public void run() {
169                        appWidgetHost.deleteAppWidgetId(launcherAppWidgetInfo.appWidgetId);
170                    }
171                }.start();
172            }
173        }
174    }
175}
176