AppsCustomizeTabHost.java revision 4afe9b31f51022538b30646fe83780e83bf22490 
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.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.ObjectAnimator;
22import android.content.Context;
23import android.content.res.Resources;
24import android.util.AttributeSet;
25import android.view.LayoutInflater;
26import android.view.MotionEvent;
27import android.view.View;
28import android.view.ViewGroup;
29import android.view.ViewPropertyAnimator;
30import android.widget.TabHost;
31import android.widget.TabWidget;
32import android.widget.TextView;
33
34import com.android.launcher.R;
35
36public class AppsCustomizeTabHost extends TabHost implements LauncherTransitionable,
37        TabHost.OnTabChangeListener  {
38    static final String LOG_TAG = "AppsCustomizeTabHost";
39
40    private static final String APPS_TAB_TAG = "APPS";
41    private static final String WIDGETS_TAB_TAG = "WIDGETS";
42    private static final int sTabBarFadeInDuration = 150;
43
44    private final LayoutInflater mLayoutInflater;
45    private ViewGroup mTabs;
46    private ViewGroup mTabsContainer;
47    private AppsCustomizePagedView mAppsCustomizePane;
48
49    public AppsCustomizeTabHost(Context context, AttributeSet attrs) {
50        super(context, attrs);
51        mLayoutInflater = LayoutInflater.from(context);
52    }
53
54    /**
55     * Convenience methods to select specific tabs.  We want to set the content type immediately
56     * in these cases, but we note that we still call setCurrentTabByTag() so that the tab view
57     * reflects the new content (but doesn't do the animation and logic associated with changing
58     * tabs manually).
59     */
60    private void setContentTypeImmediate(AppsCustomizePagedView.ContentType type) {
61        onTabChangedStart();
62        onTabChangedEnd(type);
63    }
64    void selectAppsTab() {
65        setContentTypeImmediate(AppsCustomizePagedView.ContentType.Applications);
66        setCurrentTabByTag(APPS_TAB_TAG);
67    }
68    void selectWidgetsTab() {
69        setContentTypeImmediate(AppsCustomizePagedView.ContentType.Widgets);
70        mAppsCustomizePane.setCurrentPageToWidgets();
71
72        setCurrentTabByTag(WIDGETS_TAB_TAG);
73    }
74    void selectShortcutsTab() {
75        setContentTypeImmediate(AppsCustomizePagedView.ContentType.Widgets);
76        mAppsCustomizePane.setCurrentPageToShortcuts();
77
78        setCurrentTabByTag(WIDGETS_TAB_TAG);
79    }
80
81    /**
82     * Setup the tab host and create all necessary tabs.
83     */
84    @Override
85    protected void onFinishInflate() {
86        // Setup the tab host
87        setup();
88
89        final ViewGroup tabsContainer = (ViewGroup) findViewById(R.id.tabs_container);
90        final TabWidget tabs = (TabWidget) findViewById(com.android.internal.R.id.tabs);
91        final AppsCustomizePagedView appsCustomizePane = (AppsCustomizePagedView)
92                findViewById(R.id.apps_customize_pane_content);
93        mTabs = tabs;
94        mTabsContainer = tabsContainer;
95        mAppsCustomizePane = appsCustomizePane;
96        if (tabs == null || mAppsCustomizePane == null) throw new Resources.NotFoundException();
97
98        // Configure the tabs content factory to return the same paged view (that we change the
99        // content filter on)
100        TabContentFactory contentFactory = new TabContentFactory() {
101            public View createTabContent(String tag) {
102                return appsCustomizePane;
103            }
104        };
105
106        // Create the tabs
107        TextView tabView;
108        tabView = (TextView) mLayoutInflater.inflate(R.layout.tab_widget_indicator, tabs, false);
109        tabView.setText(mContext.getString(R.string.all_apps_button_label));
110        addTab(newTabSpec(APPS_TAB_TAG).setIndicator(tabView).setContent(contentFactory));
111        tabView = (TextView) mLayoutInflater.inflate(R.layout.tab_widget_indicator, tabs, false);
112        tabView.setText(mContext.getString(R.string.widgets_tab_label));
113        addTab(newTabSpec(WIDGETS_TAB_TAG).setIndicator(tabView).setContent(contentFactory));
114        setOnTabChangedListener(this);
115
116        // Setup the key listener to jump between the last tab view and the market icon
117        AppsCustomizeTabKeyEventListener keyListener = new AppsCustomizeTabKeyEventListener();
118        View lastTab = tabs.getChildTabViewAt(tabs.getTabCount() - 1);
119        lastTab.setOnKeyListener(keyListener);
120        View shopButton = findViewById(R.id.market_button);
121        shopButton.setOnKeyListener(keyListener);
122
123        // Hide the tab bar until we measure
124        mTabsContainer.setAlpha(0f);
125    }
126
127    @Override
128    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
129        boolean remeasureTabWidth = (mTabs.getLayoutParams().width <= 0);
130        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
131
132        // Set the width of the tab list to the content width
133        if (remeasureTabWidth) {
134            int contentWidth = mAppsCustomizePane.getPageContentWidth();
135            if (contentWidth > 0) {
136                // Set the width and show the tab bar (if we have a loading graphic, we can switch
137                // it off here)
138                mTabs.getLayoutParams().width = contentWidth;
139                mTabsContainer.animate().alpha(1f).setDuration(sTabBarFadeInDuration);
140            }
141        }
142        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
143    }
144
145    @Override
146    public boolean onTouchEvent(MotionEvent event) {
147        // Intercept all touch events up to the bottom of the AppsCustomizePane so they do not fall
148        // through to the workspace and trigger showWorkspace()
149        if (event.getY() < mAppsCustomizePane.getBottom()) {
150            return true;
151        }
152        return super.onTouchEvent(event);
153    }
154
155    private void onTabChangedStart() {
156        mAppsCustomizePane.hideScrollingIndicator(false);
157    }
158    private void onTabChangedEnd(AppsCustomizePagedView.ContentType type) {
159        mAppsCustomizePane.setContentType(type);
160    }
161
162    @Override
163    public void onTabChanged(String tabId) {
164        final AppsCustomizePagedView.ContentType type = getContentTypeForTabTag(tabId);
165        if (!mAppsCustomizePane.isContentType(type)) {
166            // Animate the changing of the tab content by fading pages in and out
167            final Resources res = getResources();
168            final int duration = res.getInteger(R.integer.config_tabTransitionDuration);
169
170            ObjectAnimator anim = ObjectAnimator.ofFloat(mAppsCustomizePane, "alpha", 0f);
171            anim.setDuration(duration);
172            anim.addListener(new AnimatorListenerAdapter() {
173                @Override
174                public void onAnimationStart(android.animation.Animator animation) {
175                    onTabChangedStart();
176                }
177                @Override
178                public void onAnimationEnd(android.animation.Animator animation) {
179                    onTabChangedEnd(type);
180
181                    ObjectAnimator anim = ObjectAnimator.ofFloat(mAppsCustomizePane, "alpha", 1f);
182                    anim.setDuration(duration);
183                    anim.addListener(new AnimatorListenerAdapter() {
184                        @Override
185                        public void onAnimationEnd(android.animation.Animator animation) {
186                            if (!LauncherApplication.isScreenLarge()) {
187                                mAppsCustomizePane.flashScrollingIndicator();
188                            }
189                        }
190                    });
191                    anim.start();
192                }
193            });
194            anim.start();
195        }
196    }
197
198    /**
199     * Returns the content type for the specified tab tag.
200     */
201    public AppsCustomizePagedView.ContentType getContentTypeForTabTag(String tag) {
202        if (tag.equals(APPS_TAB_TAG)) {
203            return AppsCustomizePagedView.ContentType.Applications;
204        } else if (tag.equals(WIDGETS_TAB_TAG)) {
205            return AppsCustomizePagedView.ContentType.Widgets;
206        }
207        return AppsCustomizePagedView.ContentType.Applications;
208    }
209
210    /**
211     * Returns the tab tag for a given content type.
212     */
213    public String getTabTagForContentType(AppsCustomizePagedView.ContentType type) {
214        if (type == AppsCustomizePagedView.ContentType.Applications) {
215            return APPS_TAB_TAG;
216        } else if (type == AppsCustomizePagedView.ContentType.Widgets) {
217            return WIDGETS_TAB_TAG;
218        }
219        return APPS_TAB_TAG;
220    }
221
222    /**
223     * Disable focus on anything under this view in the hierarchy if we are not visible.
224     */
225    @Override
226    public int getDescendantFocusability() {
227        if (getVisibility() != View.VISIBLE) {
228            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
229        }
230        return super.getDescendantFocusability();
231    }
232
233    /* LauncherTransitionable overrides */
234    @Override
235    public void onLauncherTransitionStart(Animator animation, boolean toWorkspace) {
236        // isHardwareAccelerated() checks if we're attached to a window and if that
237        // window is HW accelerated-- we were sometimes not attached to a window
238        // and buildLayer was throwing an IllegalStateException
239        if (animation != null && isHardwareAccelerated()) {
240            // Turn on hardware layers for performance
241            setLayerType(LAYER_TYPE_HARDWARE, null);
242
243            // force building the layer at the beginning of the animation, so you don't get a
244            // blip early in the animation
245            buildLayer();
246        }
247    }
248
249    @Override
250    public void onLauncherTransitionEnd(Animator animation, boolean toWorkspace) {
251        if (animation != null) {
252            setLayerType(LAYER_TYPE_NONE, null);
253        }
254
255        if (!toWorkspace && !LauncherApplication.isScreenLarge()) {
256            mAppsCustomizePane.flashScrollingIndicator();
257        }
258    }
259}
260