Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/widget/incognitotoggle/IncognitoToggleButtonTablet.java

+// Copyright 2015 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.incognitotoggle;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.ImageButton;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.tabmodel.EmptyTabModelObserver;
+import org.chromium.chrome.browser.tabmodel.EmptyTabModelSelectorObserver;
+import org.chromium.chrome.browser.tabmodel.TabModel;
+import org.chromium.chrome.browser.tabmodel.TabModel.TabLaunchType;
+import org.chromium.chrome.browser.tabmodel.TabModelObserver;
+import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.chrome.browser.tabmodel.TabModelSelectorObserver;
+
+/**
+ * A {@link View} that allows a user to toggle between incognito and normal {@link TabModel}s.
+ */
+public class IncognitoToggleButtonTablet extends ImageButton {
+    private TabModelSelector mTabModelSelector;
+    private TabModelSelectorObserver mTabModelSelectorObserver;
+    private TabModelObserver mTabModelObserver;
+
+    /**
+     * Creates an instance of {@link IncognitoToggleButtonTablet}.
+     * @param context The {@link Context} to create this {@link View} under.
+     * @param attrs An {@link AttributeSet} that contains information on how to build this
+     *         {@link View}.
+     */
+    public IncognitoToggleButtonTablet(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public void onFinishInflate() {
+        super.onFinishInflate();
+
+        setScaleType(ScaleType.CENTER);
+        setVisibility(View.GONE);
+
+        setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                if (mTabModelSelector != null) {
+                    mTabModelSelector.selectModel(!mTabModelSelector.isIncognitoSelected());
+                }
+            }
+        });
+    }
+
+    /**
+     * Sets the {@link TabModelSelector} that will be queried for information about the state of
+     * the system.
+     * @param selector A {@link TabModelSelector} that represents the state of the system.
+     */
+    public void setTabModelSelector(TabModelSelector selector) {
+        mTabModelSelector = selector;
+        if (selector != null) {
+            updateButtonResource();
+            updateButtonVisibility();
+
+            mTabModelSelectorObserver = new EmptyTabModelSelectorObserver() {
+                @Override
+                public void onTabModelSelected(TabModel newModel, TabModel oldModel) {
+                    updateButtonResource();
+                }
+            };
+            mTabModelSelector.addObserver(mTabModelSelectorObserver);
+
+            mTabModelObserver = new EmptyTabModelObserver() {
+                @Override
+                public void didAddTab(Tab tab, TabLaunchType type) {
+                    updateButtonVisibility();
+                }
+
+                @Override
+                public void willCloseTab(Tab tab, boolean animate) {
+                    updateButtonVisibility();
+                }
+            };
+            for (TabModel model : mTabModelSelector.getModels()) {
+                model.addObserver(mTabModelObserver);
+            }
+        }
+    }
+
+    private void updateButtonResource() {
+        if (mTabModelSelector == null || mTabModelSelector.getCurrentModel() == null) return;
+
+        setContentDescription(getContext().getString(mTabModelSelector.isIncognitoSelected()
+                ? R.string.accessibility_tabstrip_btn_incognito_toggle_incognito
+                : R.string.accessibility_tabstrip_btn_incognito_toggle_standard));
+        setImageResource(mTabModelSelector.isIncognitoSelected()
+                ? R.drawable.btn_tabstrip_switch_incognito : R.drawable.btn_tabstrip_switch_normal);
+    }
+
+    private void updateButtonVisibility() {
+        if (mTabModelSelector == null || mTabModelSelector.getCurrentModel() == null) {
+            setVisibility(View.GONE);
+            return;
+        }
+
+        post(new Runnable() {
+            @Override
+            public void run() {
+                setVisibility(mTabModelSelector.getModel(true).getCount() > 0
+                        ? View.VISIBLE : View.GONE);
+            }
+        });
+    }
+
+    @Override
+    protected void onAttachedToWindow() {
+        if (mTabModelSelector != null) {
+            mTabModelSelector.addObserver(mTabModelSelectorObserver);
+            for (TabModel model : mTabModelSelector.getModels()) {
+                model.addObserver(mTabModelObserver);
+            }
+        }
+        super.onAttachedToWindow();
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        if (mTabModelSelector != null) {
+            mTabModelSelector.removeObserver(mTabModelSelectorObserver);
+            for (TabModel model : mTabModelSelector.getModels()) {
+                model.removeObserver(mTabModelObserver);
+            }
+        }
+        super.onDetachedFromWindow();
+    }
+}