Upstream accessibility tab switcher and related resources.

chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelAdapter.java

Index: chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelAdapter.java
new file mode 100644
index 0000000000000000000000000000000000000000..af7b42ba8fd35f8c665278a5c84a82f4af2bbfb2
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/widget/accessibility/AccessibilityTabModelAdapter.java
@@ -0,0 +1,148 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.widget.accessibility;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.tabmodel.TabList;
+import org.chromium.chrome.browser.tabmodel.TabModel;
+import org.chromium.chrome.browser.tabmodel.TabModelUtils;
+import org.chromium.chrome.browser.widget.accessibility.AccessibilityTabModelListItem.AccessibilityTabModelListItemListener;
+
+/**
+ * An instance of a {@link BaseAdapter} that represents a {@link TabModel}.
+ */
+public class AccessibilityTabModelAdapter extends BaseAdapter {
+    private final Context mContext;
+
+    private TabList mUndoneTabModel;
+    private TabModel mActualTabModel;
+    private AccessibilityTabModelAdapterListener mListener;
+    private final AccessibilityTabModelListView mCanScrollListener;
+
+    /**
+     * An interface used to notify that the {@link Tab} specified by {@code tabId} should be
+     * shown.
+     */
+    public interface AccessibilityTabModelAdapterListener {
+        /**
+         * Show the {@link Tab} specified by {@code tabId}.
+         * @param tabId The id of the {@link Tab} that should be shown.
+         */
+        void showTab(int tabId);
+    }
+
+    private final AccessibilityTabModelListItemListener mInternalListener =
+            new AccessibilityTabModelListItemListener() {
+        @Override
+        public void tabSelected(int tab) {
+            TabModelUtils.setIndex(mActualTabModel,
+                    TabModelUtils.getTabIndexById(mActualTabModel, tab));
+            if (mListener != null) mListener.showTab(tab);
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public void tabClosed(int tab) {
+            if (mActualTabModel.isClosurePending(tab)) {
+                mActualTabModel.commitTabClosure(tab);
+            } else {
+                TabModelUtils.closeTabById(mActualTabModel, tab);
+            }
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public boolean hasPendingClosure(int tab) {
+            return mUndoneTabModel.isClosurePending(tab);
+        }
+
+        @Override
+        public void schedulePendingClosure(int tab) {
+            mActualTabModel.closeTab(
+                    TabModelUtils.getTabById(mActualTabModel, tab), true, false, true);
+        }
+
+        @Override
+        public void cancelPendingClosure(int tab) {
+            mActualTabModel.cancelTabClosure(tab);
+        }
+
+        @Override
+        public void tabChanged(int tabId) {
+            notifyDataSetChanged();
+        }
+    };
+
+    /**
+     * @param context The Context to use to inflate {@link View}s in.
+     */
+    public AccessibilityTabModelAdapter(Context context,
+            AccessibilityTabModelListView listener) {
+        mContext = context;
+        mCanScrollListener = listener;
+    }
+
+    /**
+     * @param tabModel The TabModel that this adapter should represent.
+     */
+    public void setTabModel(TabModel tabModel) {
+        mActualTabModel = tabModel;
+        mUndoneTabModel = tabModel.getComprehensiveModel();
+        notifyDataSetChanged();
+    }
+
+    /**
+     * Registers a listener that will be notified when this adapter wants to show a tab.
+     * @param listener The listener to be notified of show events.
+     */
+    public void setListener(AccessibilityTabModelAdapterListener listener) {
+        mListener = listener;
+    }
+
+    @Override
+    public int getCount() {
+        return mUndoneTabModel != null ? mUndoneTabModel.getCount() : 0;
+    }
+
+    @Override
+    public Object getItem(int position) {
+        return new Object();
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return mUndoneTabModel != null ?
+                mUndoneTabModel.getTabAt(position).getId() : Tab.INVALID_TAB_ID;
+    }
+
+    @Override
+    public View getView(int position, View convertView, ViewGroup parent) {
+        int tabId = (int) getItemId(position);
+
+        if (tabId == Tab.INVALID_TAB_ID) return null;
+
+        AccessibilityTabModelListItem listItem = null;
+        if (convertView != null && convertView instanceof AccessibilityTabModelListItem) {
+            listItem = (AccessibilityTabModelListItem) convertView;
+        } else {
+            listItem = (AccessibilityTabModelListItem) LayoutInflater.from(mContext).inflate(
+                    R.layout.accessibility_tab_switcher_list_item, null, false);
+        }
+
+        listItem.setTab(TabModelUtils.getTabById(mUndoneTabModel, tabId),
+                mActualTabModel.supportsPendingClosures());
+        listItem.setListeners(mInternalListener, mCanScrollListener);
+        listItem.resetState();
+
+        return listItem;
+    }
+}