Upstream oodles of Chrome for Android code into Chromium.

chrome/android/java_staging/src/org/chromium/chrome/browser/dom_distiller/ReaderModeEdgeSwipeHandler.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.dom_distiller;
+
+import org.chromium.chrome.browser.compositor.layouts.EdgeSwipeHandlerLayoutDelegate;
+import org.chromium.chrome.browser.compositor.layouts.LayoutProvider;
+import org.chromium.chrome.browser.compositor.layouts.eventfilter.EdgeSwipeEventFilter.ScrollDirection;
+import org.chromium.chrome.browser.dom_distiller.ReaderModeStaticEventFilter.ReaderModePanelSelector;
+
+/**
+ * An {@link EdgeSwipeHandlerLayoutDelegate} that delegates all swipe events to the currently
+ * active Reader Mode Panel.
+ */
+public class ReaderModeEdgeSwipeHandler extends EdgeSwipeHandlerLayoutDelegate {
+    private final ReaderModePanelSelector mReaderModePanelSelector;
+
+    public ReaderModeEdgeSwipeHandler(ReaderModePanelSelector selector, LayoutProvider provider) {
+        super(provider);
+        mReaderModePanelSelector = selector;
+    }
+
+    @Override
+    public void swipeStarted(ScrollDirection direction, float x, float y) {
+        ReaderModePanel panel = mReaderModePanelSelector.getActiveReaderModePanel();
+        if (panel == null) super.swipeStarted(direction, x, y);
+        else panel.swipeStarted(direction, x, y);
+    }
+
+    @Override
+    public void swipeUpdated(float x, float y, float dx, float dy, float tx, float ty) {
+        ReaderModePanel panel = mReaderModePanelSelector.getActiveReaderModePanel();
+        if (panel == null) super.swipeUpdated(x, y, dx, dy, tx, ty);
+        else panel.swipeUpdated(x, y, dx, dy, tx, ty);
+    }
+
+    @Override
+    public void swipeFinished() {
+        ReaderModePanel panel = mReaderModePanelSelector.getActiveReaderModePanel();
+        if (panel == null) super.swipeFinished();
+        else panel.swipeFinished();
+    }
+
+    @Override
+    public boolean isSwipeEnabled(ScrollDirection direction) {
+        ReaderModePanel panel = mReaderModePanelSelector.getActiveReaderModePanel();
+        return panel != null && panel.isSwipeEnabled(direction);
+    }
+}