Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/ntp/IncognitoNewTabPageView.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.ntp;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.FrameLayout;
+
+import com.google.android.apps.chrome.R;
+
+import org.chromium.chrome.browser.util.ViewUtils;
+
+/**
+ * The New Tab Page for use in the incognito profile.
+ */
+public class IncognitoNewTabPageView extends FrameLayout {
+
+    private IncognitoNewTabPageManager mManager;
+    private boolean mFirstShow = true;
+    private NewTabScrollView mScrollView;
+
+    private int mSnapshotWidth;
+    private int mSnapshotHeight;
+    private int mSnapshotScrollY;
+
+    /**
+     * Manages the view interaction with the rest of the system.
+     */
+    interface IncognitoNewTabPageManager {
+        /** Loads a page explaining details about incognito mode in the current tab. */
+        void loadIncognitoLearnMore();
+
+        /**
+         * Called when the NTP has completely finished loading (all views will be inflated
+         * and any dependent resources will have been loaded).
+         */
+        void onLoadingComplete();
+    }
+
+    /** Default constructor needed to inflate via XML. */
+    public IncognitoNewTabPageView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        mScrollView = (NewTabScrollView) findViewById(R.id.ntp_scrollview);
+
+        // FOCUS_BEFORE_DESCENDANTS is needed to support keyboard shortcuts. Otherwise, pressing
+        // any shortcut causes the UrlBar to be focused. See ViewRootImpl.leaveTouchMode().
+        mScrollView.setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS);
+
+        View learnMore = findViewById(R.id.learn_more);
+        learnMore.setOnClickListener(new OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mManager.loadIncognitoLearnMore();
+            }
+        });
+    }
+
+    /**
+     * Initialize the incognito New Tab Page.
+     * @param manager The manager that handles external dependencies of the view.
+     */
+    void initialize(IncognitoNewTabPageManager manager) {
+        mManager = manager;
+    }
+
+    /**
+     * @see org.chromium.chrome.browser.compositor.layouts.content.
+     *         InvalidationAwareThumbnailProvider#shouldCaptureThumbnail()
+     */
+    boolean shouldCaptureThumbnail() {
+        if (getWidth() == 0 || getHeight() == 0) return false;
+
+        return getWidth() != mSnapshotWidth
+                || getHeight() != mSnapshotHeight
+                || mScrollView.getScrollY() != mSnapshotScrollY;
+    }
+
+    /**
+     * @see org.chromium.chrome.browser.compositor.layouts.content.
+     *         InvalidationAwareThumbnailProvider#captureThumbnail(Canvas)
+     */
+    void captureThumbnail(Canvas canvas) {
+        ViewUtils.captureBitmap(this, canvas);
+        mSnapshotWidth = getWidth();
+        mSnapshotHeight = getHeight();
+        mSnapshotScrollY = mScrollView.getScrollY();
+    }
+
+    // OnAttachStateChangeListener overrides
+
+    @Override
+    public void onAttachedToWindow() {
+        assert mManager != null;
+        if (mFirstShow) {
+            mManager.onLoadingComplete();
+            mFirstShow = false;
+        }
+    }
+}