AppCompatDelegateImplBase.java revision a4b5c35036e68c7551dd77641ceec17b92c6368d 
1/*
2 * Copyright (C) 2013 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 android.support.v7.app;
18
19import android.app.Activity;
20import android.content.Context;
21import android.content.res.TypedArray;
22import android.graphics.drawable.Drawable;
23import android.os.Bundle;
24import android.support.v7.appcompat.R;
25import android.support.v7.internal.view.SupportMenuInflater;
26import android.support.v7.internal.view.WindowCallbackWrapper;
27import android.support.v7.internal.view.menu.MenuBuilder;
28import android.support.v7.internal.widget.TintTypedArray;
29import android.support.v7.view.ActionMode;
30import android.view.KeyEvent;
31import android.view.Menu;
32import android.view.MenuInflater;
33import android.view.View;
34import android.view.Window;
35
36abstract class AppCompatDelegateImplBase extends AppCompatDelegate {
37
38    final Context mContext;
39    final Window mWindow;
40    final Window.Callback mOriginalWindowCallback;
41    final Window.Callback mAppCompatWindowCallback;
42    final AppCompatCallback mAppCompatCallback;
43
44    ActionBar mActionBar;
45    MenuInflater mMenuInflater;
46
47    // true if this activity has an action bar.
48    boolean mHasActionBar;
49    // true if this activity's action bar overlays other activity content.
50    boolean mOverlayActionBar;
51    // true if this any action modes should overlay the activity content
52    boolean mOverlayActionMode;
53    // true if this activity is floating (e.g. Dialog)
54    boolean mIsFloating;
55    // true if this activity has no title
56    boolean mWindowNoTitle;
57
58    private CharSequence mTitle;
59
60    private boolean mIsDestroyed;
61
62    AppCompatDelegateImplBase(Context context, Window window, AppCompatCallback callback) {
63        mContext = context;
64        mWindow = window;
65        mAppCompatCallback = callback;
66
67        mOriginalWindowCallback = mWindow.getCallback();
68        if (mOriginalWindowCallback instanceof AppCompatWindowCallbackBase) {
69            throw new IllegalStateException(
70                    "AppCompat has already installed itself into the Window");
71        }
72        mAppCompatWindowCallback = wrapWindowCallback(mOriginalWindowCallback);
73        // Now install the new callback
74        mWindow.setCallback(mAppCompatWindowCallback);
75    }
76
77    abstract void initWindowDecorActionBar();
78
79    Window.Callback wrapWindowCallback(Window.Callback callback) {
80        return new AppCompatWindowCallbackBase(callback);
81    }
82
83    @Override
84    public ActionBar getSupportActionBar() {
85        // The Action Bar should be lazily created as hasActionBar
86        // could change after onCreate
87        initWindowDecorActionBar();
88        return mActionBar;
89    }
90
91    final ActionBar peekSupportActionBar() {
92        return mActionBar;
93    }
94
95    @Override
96    public MenuInflater getMenuInflater() {
97        // Make sure that action views can get an appropriate theme.
98        if (mMenuInflater == null) {
99            initWindowDecorActionBar();
100            mMenuInflater = new SupportMenuInflater(
101                    mActionBar != null ? mActionBar.getThemedContext() : mContext);
102        }
103        return mMenuInflater;
104    }
105
106    // Methods used to create and respond to options menu
107    abstract void onPanelClosed(int featureId, Menu menu);
108
109    abstract boolean onMenuOpened(int featureId, Menu menu);
110
111    abstract boolean dispatchKeyEvent(KeyEvent event);
112
113    abstract boolean onKeyShortcut(int keyCode, KeyEvent event);
114
115    @Override
116    public final ActionBarDrawerToggle.Delegate getDrawerToggleDelegate() {
117        return new ActionBarDrawableToggleImpl();
118    }
119
120    final Context getActionBarThemedContext() {
121        Context context = null;
122
123        // If we have an action bar, let it return a themed context
124        ActionBar ab = getSupportActionBar();
125        if (ab != null) {
126            context = ab.getThemedContext();
127        }
128
129        if (context == null) {
130            context = mContext;
131        }
132        return context;
133    }
134
135    private class ActionBarDrawableToggleImpl implements ActionBarDrawerToggle.Delegate {
136        @Override
137        public Drawable getThemeUpIndicator() {
138            final TintTypedArray a = TintTypedArray.obtainStyledAttributes(
139                    getActionBarThemedContext(), null, new int[]{ R.attr.homeAsUpIndicator });
140            final Drawable result = a.getDrawable(0);
141            a.recycle();
142            return result;
143        }
144
145        @Override
146        public Context getActionBarThemedContext() {
147            return AppCompatDelegateImplBase.this.getActionBarThemedContext();
148        }
149
150        @Override
151        public boolean isNavigationVisible() {
152            final ActionBar ab = getSupportActionBar();
153            return ab != null && (ab.getDisplayOptions() & ActionBar.DISPLAY_HOME_AS_UP) != 0;
154        }
155
156        @Override
157        public void setActionBarUpIndicator(Drawable upDrawable, int contentDescRes) {
158            ActionBar ab = getSupportActionBar();
159            if (ab != null) {
160                ab.setHomeAsUpIndicator(upDrawable);
161                ab.setHomeActionContentDescription(contentDescRes);
162            }
163        }
164
165        @Override
166        public void setActionBarDescription(int contentDescRes) {
167            ActionBar ab = getSupportActionBar();
168            if (ab != null) {
169                ab.setHomeActionContentDescription(contentDescRes);
170            }
171        }
172    }
173
174    abstract ActionMode startSupportActionModeFromWindow(ActionMode.Callback callback);
175
176    @Override
177    public final void onDestroy() {
178        mIsDestroyed = true;
179    }
180
181    @Override
182    public void setHandleNativeActionModesEnabled(boolean enabled) {
183        // no-op pre-v14
184    }
185
186    @Override
187    public boolean isHandleNativeActionModesEnabled() {
188        // Always false pre-v14
189        return false;
190    }
191
192    final boolean isDestroyed() {
193        return mIsDestroyed;
194    }
195
196    final Window.Callback getWindowCallback() {
197        return mWindow.getCallback();
198    }
199
200    @Override
201    public final void setTitle(CharSequence title) {
202        mTitle = title;
203        onTitleChanged(title);
204    }
205
206    abstract void onTitleChanged(CharSequence title);
207
208    final CharSequence getTitle() {
209        // If the original window callback is an Activity, we'll use it's title
210        if (mOriginalWindowCallback instanceof Activity) {
211            return ((Activity) mOriginalWindowCallback).getTitle();
212        }
213        // Else, we'll return the title we have recorded ourselves
214        return mTitle;
215    }
216
217    class AppCompatWindowCallbackBase extends WindowCallbackWrapper {
218        AppCompatWindowCallbackBase(Window.Callback callback) {
219            super(callback);
220        }
221
222        @Override
223        public boolean dispatchKeyEvent(KeyEvent event) {
224            return AppCompatDelegateImplBase.this.dispatchKeyEvent(event)
225                    || super.dispatchKeyEvent(event);
226        }
227
228        @Override
229        public boolean dispatchKeyShortcutEvent(KeyEvent event) {
230            return super.dispatchKeyShortcutEvent(event)
231                    || AppCompatDelegateImplBase.this.onKeyShortcut(event.getKeyCode(), event);
232        }
233
234        @Override
235        public boolean onCreatePanelMenu(int featureId, Menu menu) {
236            if (featureId == Window.FEATURE_OPTIONS_PANEL && !(menu instanceof MenuBuilder)) {
237                // If this is an options menu but it's not an AppCompat menu, we eat the event
238                // and return false
239                return false;
240            }
241            return super.onCreatePanelMenu(featureId, menu);
242        }
243
244        @Override
245        public void onContentChanged() {
246            // We purposely do not propagate this call as this is called when we install
247            // our sub-decor rather than the user's content
248        }
249
250        @Override
251        public boolean onPreparePanel(int featureId, View view, Menu menu) {
252            final MenuBuilder mb = menu instanceof MenuBuilder ? (MenuBuilder) menu : null;
253
254            if (featureId == Window.FEATURE_OPTIONS_PANEL && mb == null) {
255                // If this is an options menu but it's not an AppCompat menu, we eat the event
256                // and return false
257                return false;
258            }
259
260            // On ICS and below devices, onPreparePanel calls menu.hasVisibleItems() to determine
261            // if a panel is prepared. This interferes with any initially invisible items, which
262            // are later made visible. We workaround it by making hasVisibleItems() always
263            // return true during the onPreparePanel call.
264            if (mb != null) {
265                mb.setOverrideVisibleItems(true);
266            }
267
268            final boolean handled = super.onPreparePanel(featureId, view, menu);
269
270            if (mb != null) {
271                mb.setOverrideVisibleItems(false);
272            }
273
274            return handled;
275        }
276
277        @Override
278        public boolean onMenuOpened(int featureId, Menu menu) {
279            return super.onMenuOpened(featureId, menu)
280                    || AppCompatDelegateImplBase.this.onMenuOpened(featureId, menu);
281        }
282
283        @Override
284        public void onPanelClosed(int featureId, Menu menu) {
285            super.onPanelClosed(featureId, menu);
286            AppCompatDelegateImplBase.this.onPanelClosed(featureId, menu);
287        }
288    }
289}
290