AppCompatDelegateImplBase.java revision 0df7523d5586db69bd4960d9e72b2c24c12b73a0 
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    // true if the theme has been read
58    boolean mThemeRead;
59
60    private CharSequence mTitle;
61
62    private boolean mIsDestroyed;
63
64    AppCompatDelegateImplBase(Context context, Window window, AppCompatCallback callback) {
65        mContext = context;
66        mWindow = window;
67        mAppCompatCallback = callback;
68
69        mOriginalWindowCallback = mWindow.getCallback();
70        if (mOriginalWindowCallback instanceof AppCompatWindowCallbackBase) {
71            throw new IllegalStateException(
72                    "AppCompat has already installed itself into the Window");
73        }
74        mAppCompatWindowCallback = wrapWindowCallback(mOriginalWindowCallback);
75        // Now install the new callback
76        mWindow.setCallback(mAppCompatWindowCallback);
77    }
78
79    abstract void initWindowDecorActionBar();
80
81    Window.Callback wrapWindowCallback(Window.Callback callback) {
82        return new AppCompatWindowCallbackBase(callback);
83    }
84
85    @Override
86    public ActionBar getSupportActionBar() {
87        // The Action Bar should be lazily created as hasActionBar
88        // could change after onCreate
89        initWindowDecorActionBar();
90        return mActionBar;
91    }
92
93    final ActionBar peekSupportActionBar() {
94        return mActionBar;
95    }
96
97    @Override
98    public MenuInflater getMenuInflater() {
99        // Make sure that action views can get an appropriate theme.
100        if (mMenuInflater == null) {
101            initWindowDecorActionBar();
102            mMenuInflater = new SupportMenuInflater(
103                    mActionBar != null ? mActionBar.getThemedContext() : mContext);
104        }
105        return mMenuInflater;
106    }
107
108    // Methods used to create and respond to options menu
109    abstract void onPanelClosed(int featureId, Menu menu);
110
111    abstract boolean onMenuOpened(int featureId, Menu menu);
112
113    abstract boolean dispatchKeyEvent(KeyEvent event);
114
115    abstract boolean onKeyShortcut(int keyCode, KeyEvent event);
116
117    @Override
118    public final ActionBarDrawerToggle.Delegate getDrawerToggleDelegate() {
119        return new ActionBarDrawableToggleImpl();
120    }
121
122    final Context getActionBarThemedContext() {
123        Context context = null;
124
125        // If we have an action bar, let it return a themed context
126        ActionBar ab = getSupportActionBar();
127        if (ab != null) {
128            context = ab.getThemedContext();
129        }
130
131        if (context == null) {
132            context = mContext;
133        }
134        return context;
135    }
136
137    private class ActionBarDrawableToggleImpl implements ActionBarDrawerToggle.Delegate {
138        @Override
139        public Drawable getThemeUpIndicator() {
140            final TintTypedArray a = TintTypedArray.obtainStyledAttributes(
141                    getActionBarThemedContext(), null, new int[]{ R.attr.homeAsUpIndicator });
142            final Drawable result = a.getDrawable(0);
143            a.recycle();
144            return result;
145        }
146
147        @Override
148        public Context getActionBarThemedContext() {
149            return AppCompatDelegateImplBase.this.getActionBarThemedContext();
150        }
151
152        @Override
153        public boolean isNavigationVisible() {
154            final ActionBar ab = getSupportActionBar();
155            return ab != null && (ab.getDisplayOptions() & ActionBar.DISPLAY_HOME_AS_UP) != 0;
156        }
157
158        @Override
159        public void setActionBarUpIndicator(Drawable upDrawable, int contentDescRes) {
160            ActionBar ab = getSupportActionBar();
161            if (ab != null) {
162                ab.setHomeAsUpIndicator(upDrawable);
163                ab.setHomeActionContentDescription(contentDescRes);
164            }
165        }
166
167        @Override
168        public void setActionBarDescription(int contentDescRes) {
169            ActionBar ab = getSupportActionBar();
170            if (ab != null) {
171                ab.setHomeActionContentDescription(contentDescRes);
172            }
173        }
174    }
175
176    abstract ActionMode startSupportActionModeFromWindow(ActionMode.Callback callback);
177
178    @Override
179    public final void onDestroy() {
180        mIsDestroyed = true;
181    }
182
183    @Override
184    public void setHandleNativeActionModesEnabled(boolean enabled) {
185        // no-op pre-v14
186    }
187
188    @Override
189    public boolean isHandleNativeActionModesEnabled() {
190        // Always false pre-v14
191        return false;
192    }
193
194    final boolean isDestroyed() {
195        return mIsDestroyed;
196    }
197
198    final Window.Callback getWindowCallback() {
199        return mWindow.getCallback();
200    }
201
202    @Override
203    public final void setTitle(CharSequence title) {
204        mTitle = title;
205        onTitleChanged(title);
206    }
207
208    abstract void onTitleChanged(CharSequence title);
209
210    final CharSequence getTitle() {
211        // If the original window callback is an Activity, we'll use it's title
212        if (mOriginalWindowCallback instanceof Activity) {
213            return ((Activity) mOriginalWindowCallback).getTitle();
214        }
215        // Else, we'll return the title we have recorded ourselves
216        return mTitle;
217    }
218
219    class AppCompatWindowCallbackBase extends WindowCallbackWrapper {
220        AppCompatWindowCallbackBase(Window.Callback callback) {
221            super(callback);
222        }
223
224        @Override
225        public boolean dispatchKeyEvent(KeyEvent event) {
226            return AppCompatDelegateImplBase.this.dispatchKeyEvent(event)
227                    || super.dispatchKeyEvent(event);
228        }
229
230        @Override
231        public boolean dispatchKeyShortcutEvent(KeyEvent event) {
232            return super.dispatchKeyShortcutEvent(event)
233                    || AppCompatDelegateImplBase.this.onKeyShortcut(event.getKeyCode(), event);
234        }
235
236        @Override
237        public boolean onCreatePanelMenu(int featureId, Menu menu) {
238            if (featureId == Window.FEATURE_OPTIONS_PANEL && !(menu instanceof MenuBuilder)) {
239                // If this is an options menu but it's not an AppCompat menu, we eat the event
240                // and return false
241                return false;
242            }
243            return super.onCreatePanelMenu(featureId, menu);
244        }
245
246        @Override
247        public void onContentChanged() {
248            // We purposely do not propagate this call as this is called when we install
249            // our sub-decor rather than the user's content
250        }
251
252        @Override
253        public boolean onPreparePanel(int featureId, View view, Menu menu) {
254            final MenuBuilder mb = menu instanceof MenuBuilder ? (MenuBuilder) menu : null;
255
256            if (featureId == Window.FEATURE_OPTIONS_PANEL && mb == null) {
257                // If this is an options menu but it's not an AppCompat menu, we eat the event
258                // and return false
259                return false;
260            }
261
262            // On ICS and below devices, onPreparePanel calls menu.hasVisibleItems() to determine
263            // if a panel is prepared. This interferes with any initially invisible items, which
264            // are later made visible. We workaround it by making hasVisibleItems() always
265            // return true during the onPreparePanel call.
266            if (mb != null) {
267                mb.setOverrideVisibleItems(true);
268            }
269
270            final boolean handled = super.onPreparePanel(featureId, view, menu);
271
272            if (mb != null) {
273                mb.setOverrideVisibleItems(false);
274            }
275
276            return handled;
277        }
278
279        @Override
280        public boolean onMenuOpened(int featureId, Menu menu) {
281            super.onMenuOpened(featureId, menu);
282            AppCompatDelegateImplBase.this.onMenuOpened(featureId, menu);
283            return true;
284        }
285
286        @Override
287        public void onPanelClosed(int featureId, Menu menu) {
288            super.onPanelClosed(featureId, menu);
289            AppCompatDelegateImplBase.this.onPanelClosed(featureId, menu);
290        }
291    }
292}
293