Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/compositor/layouts/GestureHandlerLayoutDelegate.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.compositor.layouts;
+
+import org.chromium.chrome.browser.compositor.layouts.eventfilter.GestureHandler;
+
+/**
+ * A {@link GestureHandler} that takes a {@link LayoutProvider} and delegates all gesture events
+ * to {@link LayoutProvider#getActiveLayout()}.
+ */
+class GestureHandlerLayoutDelegate implements GestureHandler {
+    private final LayoutProvider mLayoutProvider;
+
+    /**
+     * Creates an instance of the {@link GestureHandlerLayoutDelegate}.
+     * @param provider A {@link LayoutProvider} instance.
+     */
+    public GestureHandlerLayoutDelegate(LayoutProvider provider) {
+        mLayoutProvider = provider;
+    }
+
+    @Override
+    public void onDown(float x, float y) {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().onDown(LayoutManager.time(), x, y);
+    }
+
+    @Override
+    public void onUpOrCancel() {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().onUpOrCancel(LayoutManager.time());
+    }
+
+    @Override
+    public void drag(float x, float y, float dx, float dy, float tx, float ty) {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().drag(LayoutManager.time(), x, y, dx, dy);
+    }
+
+    @Override
+    public void click(float x, float y) {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().click(LayoutManager.time(), x, y);
+    }
+
+    @Override
+    public void fling(float x, float y, float velocityX, float velocityY) {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().fling(LayoutManager.time(), x, y, velocityX, velocityY);
+    }
+
+    @Override
+    public void onLongPress(float x, float y) {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().onLongPress(LayoutManager.time(), x, y);
+    }
+
+    @Override
+    public void onPinch(float x0, float y0, float x1, float y1, boolean firstEvent) {
+        if (mLayoutProvider.getActiveLayout() == null) return;
+        mLayoutProvider.getActiveLayout().onPinch(LayoutManager.time(), x0, y0, x1, y1, firstEvent);
+    }
+}