AppsCustomizeTabHost.java revision 32174c878c77b4e0f13449f4c26ff6b487bc7ca6 
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
56     */
57    void selectAppsTab() {
58        setCurrentTabByTag(APPS_TAB_TAG);
59    }
60    void selectWidgetsTab() {
61        setCurrentTabByTag(WIDGETS_TAB_TAG);
62    }
63
64    /**
65     * Setup the tab host and create all necessary tabs.
66     */
67    @Override
68    protected void onFinishInflate() {
69        // Setup the tab host
70        setup();
71
72        final ViewGroup tabsContainer = (ViewGroup) findViewById(R.id.tabs_container);
73        final TabWidget tabs = (TabWidget) findViewById(com.android.internal.R.id.tabs);
74        final AppsCustomizePagedView appsCustomizePane = (AppsCustomizePagedView)
75                findViewById(R.id.apps_customize_pane_content);
76        mTabs = tabs;
77        mTabsContainer = tabsContainer;
78        mAppsCustomizePane = appsCustomizePane;
79        if (tabs == null || mAppsCustomizePane == null) throw new Resources.NotFoundException();
80
81        // Configure the tabs content factory to return the same paged view (that we change the
82        // content filter on)
83        TabContentFactory contentFactory = new TabContentFactory() {
84            public View createTabContent(String tag) {
85                return appsCustomizePane;
86            }
87        };
88
89        // Create the tabs
90        TextView tabView;
91        tabView = (TextView) mLayoutInflater.inflate(R.layout.tab_widget_indicator, tabs, false);
92        tabView.setText(mContext.getString(R.string.all_apps_button_label));
93        addTab(newTabSpec(APPS_TAB_TAG).setIndicator(tabView).setContent(contentFactory));
94        tabView = (TextView) mLayoutInflater.inflate(R.layout.tab_widget_indicator, tabs, false);
95        tabView.setText(mContext.getString(R.string.widgets_tab_label));
96        addTab(newTabSpec(WIDGETS_TAB_TAG).setIndicator(tabView).setContent(contentFactory));
97        setOnTabChangedListener(this);
98
99        // Setup the key listener to jump between the last tab view and the market icon
100        AppsCustomizeTabKeyEventListener keyListener = new AppsCustomizeTabKeyEventListener();
101        View lastTab = tabs.getChildTabViewAt(tabs.getTabCount() - 1);
102        lastTab.setOnKeyListener(keyListener);
103        View shopButton = findViewById(R.id.market_button);
104        shopButton.setOnKeyListener(keyListener);
105
106        // Hide the tab bar until we measure
107        mTabsContainer.setAlpha(0f);
108    }
109
110    @Override
111    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
112        boolean remeasureTabWidth = (mTabs.getLayoutParams().width <= 0);
113        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
114
115        // Set the width of the tab list to the content width
116        if (remeasureTabWidth) {
117            int contentWidth = mAppsCustomizePane.getPageContentWidth();
118            if (contentWidth > 0) {
119                // Set the width and show the tab bar (if we have a loading graphic, we can switch
120                // it off here)
121                mTabs.getLayoutParams().width = contentWidth;
122                mTabsContainer.animate().alpha(1f).setDuration(sTabBarFadeInDuration);
123            }
124        }
125        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
126    }
127
128    @Override
129    public boolean onTouchEvent(MotionEvent event) {
130        // Intercept all touch events up to the bottom of the AppsCustomizePane so they do not fall
131        // through to the workspace and trigger showWorkspace()
132        if (event.getY() < mAppsCustomizePane.getBottom()) {
133            return true;
134        }
135        return super.onTouchEvent(event);
136    }
137
138    @Override
139    public void onTabChanged(String tabId) {
140        final AppsCustomizePagedView.ContentType type = getContentTypeForTabTag(tabId);
141        if (!mAppsCustomizePane.isContentType(type)) {
142            // Animate the changing of the tab content by fading pages in and out
143            final Resources res = getResources();
144            final int duration = res.getInteger(R.integer.config_tabTransitionDuration);
145
146            ObjectAnimator anim = ObjectAnimator.ofFloat(mAppsCustomizePane, "alpha", 0f);
147            anim.setDuration(duration);
148            anim.addListener(new AnimatorListenerAdapter() {
149                @Override
150                public void onAnimationStart(android.animation.Animator animation) {
151                    mAppsCustomizePane.hideScrollingIndicator(false);
152                }
153                @Override
154                public void onAnimationEnd(android.animation.Animator animation) {
155                    mAppsCustomizePane.setContentType(type);
156
157                    ObjectAnimator anim = ObjectAnimator.ofFloat(mAppsCustomizePane, "alpha", 1f);
158                    anim.setDuration(duration);
159                    anim.addListener(new AnimatorListenerAdapter() {
160                        @Override
161                        public void onAnimationEnd(android.animation.Animator animation) {
162                            mAppsCustomizePane.flashScrollingIndicator();
163                        }
164                    });
165                    anim.start();
166                }
167            });
168            anim.start();
169        }
170    }
171
172    /**
173     * Returns the content type for the specified tab tag.
174     */
175    public AppsCustomizePagedView.ContentType getContentTypeForTabTag(String tag) {
176        if (tag.equals(APPS_TAB_TAG)) {
177            return AppsCustomizePagedView.ContentType.Applications;
178        } else if (tag.equals(WIDGETS_TAB_TAG)) {
179            return AppsCustomizePagedView.ContentType.Widgets;
180        }
181        return AppsCustomizePagedView.ContentType.Applications;
182    }
183
184    /**
185     * Returns the tab tag for a given content type.
186     */
187    public String getTabTagForContentType(AppsCustomizePagedView.ContentType type) {
188        if (type == AppsCustomizePagedView.ContentType.Applications) {
189            return APPS_TAB_TAG;
190        } else if (type == AppsCustomizePagedView.ContentType.Widgets) {
191            return WIDGETS_TAB_TAG;
192        }
193        return APPS_TAB_TAG;
194    }
195
196    /**
197     * Disable focus on anything under this view in the hierarchy if we are not visible.
198     */
199    @Override
200    public int getDescendantFocusability() {
201        if (getVisibility() != View.VISIBLE) {
202            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
203        }
204        return super.getDescendantFocusability();
205    }
206
207    /* LauncherTransitionable overrides */
208    @Override
209    public void onLauncherTransitionStart(Animator animation) {
210        if (animation != null) {
211            // Turn on hardware layers for performance
212            setLayerType(LAYER_TYPE_HARDWARE, null);
213
214            // force building the layer at the beginning of the animation, so you don't get a
215            // blip early in the animation
216            buildLayer();
217        }
218    }
219
220    @Override
221    public void onLauncherTransitionEnd(Animator animation) {
222        if (animation != null) {
223            setLayerType(LAYER_TYPE_NONE, null);
224        }
225
226        mAppsCustomizePane.flashScrollingIndicator();
227    }
228}
229