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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 package org.chromium.chrome.browser.widget.emptybackground; |
| 6 |
| 7 import android.app.Activity; |
| 8 import android.view.View; |
| 9 import android.view.View.OnAttachStateChangeListener; |
| 10 import android.view.ViewStub; |
| 11 |
| 12 import com.google.android.apps.chrome.R; |
| 13 |
| 14 import org.chromium.chrome.browser.Tab; |
| 15 import org.chromium.chrome.browser.appmenu.AppMenuHandler; |
| 16 import org.chromium.chrome.browser.compositor.layouts.OverviewModeBehavior; |
| 17 import org.chromium.chrome.browser.tabmodel.ChromeTabCreator; |
| 18 import org.chromium.chrome.browser.tabmodel.EmptyTabModelObserver; |
| 19 import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver; |
| 20 import org.chromium.chrome.browser.tabmodel.TabModel; |
| 21 import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType; |
| 22 import org.chromium.chrome.browser.tabmodel.TabModelObserver; |
| 23 import org.chromium.chrome.browser.tabmodel.TabModelSelector; |
| 24 import org.chromium.chrome.browser.tabmodel.TabModelSelectorObserver; |
| 25 |
| 26 import java.util.List; |
| 27 |
| 28 /** |
| 29 * Handler for {@link EmptyBackgroundViewTablet}. |
| 30 */ |
| 31 public class EmptyBackgroundViewWrapper { |
| 32 private final Activity mActivity; |
| 33 private final TabModelSelector mTabModelSelector; |
| 34 private final ChromeTabCreator mTabCreator; |
| 35 private final TabModelObserver mTabModelObserver; |
| 36 private final TabModelSelectorObserver mTabModelSelectorObserver; |
| 37 private final OverviewModeBehavior mOverviewModeBehavior; |
| 38 |
| 39 private EmptyBackgroundViewTablet mBackgroundView; |
| 40 private final AppMenuHandler mMenuHandler; |
| 41 |
| 42 /** |
| 43 * Creates a {@link EmptyBackgroundViewWrapper} instance that will lazily in
flate. |
| 44 * @param selector A {@link TabModelSelector} that will be used
to query system |
| 45 * state. |
| 46 * @param tabCreator A {@link ChromeTabCreator} that will be used
to open the New Tab |
| 47 * Page. |
| 48 * @param activity An {@link Activity} that represents a parent
of the |
| 49 * {@link android.view.ViewStub}. |
| 50 * @param menuHandler A {@link AppMenuHandler} to handle menu touch
events. |
| 51 * @param overviewModeBehavior A {@link OverviewModeBehavior} instance to de
tect when the app |
| 52 * is in overview mode. |
| 53 */ |
| 54 public EmptyBackgroundViewWrapper(TabModelSelector selector, ChromeTabCreato
r tabCreator, |
| 55 Activity activity, AppMenuHandler menuHandler, |
| 56 OverviewModeBehavior overviewModeBehavior) { |
| 57 mActivity = activity; |
| 58 mMenuHandler = menuHandler; |
| 59 mTabModelSelector = selector; |
| 60 mTabCreator = tabCreator; |
| 61 mOverviewModeBehavior = overviewModeBehavior; |
| 62 mTabModelObserver = new EmptyTabModelObserver() { |
| 63 @Override |
| 64 public void didAddTab(Tab tab, TabLaunchType type) { |
| 65 updateEmptyContainerState(); |
| 66 } |
| 67 |
| 68 @Override |
| 69 public void tabClosureUndone(Tab tab) { |
| 70 updateEmptyContainerState(); |
| 71 } |
| 72 |
| 73 @Override |
| 74 public void didCloseTab(Tab tab) { |
| 75 updateEmptyContainerState(); |
| 76 } |
| 77 |
| 78 @Override |
| 79 public void tabPendingClosure(Tab tab) { |
| 80 updateEmptyContainerState(); |
| 81 } |
| 82 |
| 83 @Override |
| 84 public void allTabsPendingClosure(List<Integer> tabIds) { |
| 85 updateEmptyContainerState(); |
| 86 } |
| 87 }; |
| 88 mTabModelSelectorObserver = new EmptyTabModelSelectorObserver() { |
| 89 @Override |
| 90 public void onTabModelSelected(TabModel newModel, TabModel oldModel)
{ |
| 91 updateEmptyContainerState(); |
| 92 } |
| 93 }; |
| 94 } |
| 95 |
| 96 /** |
| 97 * Initialize the wrapper to listen for the proper notifications. |
| 98 */ |
| 99 public void initialize() { |
| 100 for (TabModel model : mTabModelSelector.getModels()) model.addObserver(m
TabModelObserver); |
| 101 mTabModelSelector.addObserver(mTabModelSelectorObserver); |
| 102 } |
| 103 |
| 104 /** |
| 105 * Unregister all dependencies and listeners. |
| 106 */ |
| 107 public void uninitialize() { |
| 108 for (TabModel model : mTabModelSelector.getModels()) { |
| 109 model.removeObserver(mTabModelObserver); |
| 110 } |
| 111 mTabModelSelector.removeObserver(mTabModelSelectorObserver); |
| 112 } |
| 113 |
| 114 private void inflateViewIfNecessary() { |
| 115 if (mBackgroundView != null) return; |
| 116 |
| 117 mBackgroundView = (EmptyBackgroundViewTablet) ((ViewStub) mActivity.find
ViewById( |
| 118 R.id.empty_container_stub)).inflate(); |
| 119 mBackgroundView.setTabModelSelector(mTabModelSelector); |
| 120 mBackgroundView.setTabCreator(mTabCreator); |
| 121 mBackgroundView.setMenuOnTouchListener(mMenuHandler); |
| 122 mBackgroundView.addOnAttachStateChangeListener(new OnAttachStateChangeLi
stener() { |
| 123 @Override |
| 124 public void onViewDetachedFromWindow(View v) { |
| 125 uninitialize(); |
| 126 } |
| 127 |
| 128 @Override |
| 129 public void onViewAttachedToWindow(View v) { |
| 130 } |
| 131 }); |
| 132 } |
| 133 |
| 134 private void updateEmptyContainerState() { |
| 135 boolean showEmptyBackground = shouldShowEmptyContainer(); |
| 136 if (showEmptyBackground) { |
| 137 inflateViewIfNecessary(); |
| 138 } |
| 139 |
| 140 if (mBackgroundView != null) { |
| 141 mBackgroundView.setEmptyContainerState(showEmptyBackground); |
| 142 } |
| 143 } |
| 144 |
| 145 private boolean shouldShowEmptyContainer() { |
| 146 TabModel model = mTabModelSelector.getModel(false); |
| 147 if (model == null) { |
| 148 return false; |
| 149 } |
| 150 boolean isIncognitoEmpty = mTabModelSelector.getModel(true).getCount() =
= 0; |
| 151 boolean incognitoSelected = mTabModelSelector.isIncognitoSelected(); |
| 152 |
| 153 // Only show the empty container if: |
| 154 // 1. There are no tabs in the normal TabModel AND |
| 155 // 2. Overview mode is not showing AND |
| 156 // 3. We're in the normal TabModel OR there are no tabs present in eithe
r model |
| 157 return model.getCount() == 0 && !mOverviewModeBehavior.overviewVisible() |
| 158 && (!incognitoSelected || isIncognitoEmpty); |
| 159 } |
| 160 } |
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