Suppress touchscreen tap immediately after a GestureFlingCancel

Tapping on the touchscreen during a fling scroll causes a
GestureFlingCancel to be sent to stop the fling. It also sends a pair of
GestureTapDown/GestureTap events that should be suppressed if the fling
is successfully stopped (otherwise we will have undesirable side
effects; e.g. activating a link or push button in tap location). This
was working for touchpad. It is now added for touchscreen, too.

BUG=162242


Review URL: https://chromiumcodereview.appspot.com/12087140

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@190017 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 66 insertions, 0 deletions

diff --git a/content/browser/renderer_host/touchscreen_tap_suppression_controller.cc b/content/browser/renderer_host/touchscreen_tap_suppression_controller.cc
new file mode 100644
index 0000000..8de9e40
--- /dev/null
+++ b/content/browser/renderer_host/touchscreen_tap_suppression_controller.cc
@@ -0,0 +1,66 @@
+// Copyright (c) 2013 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.
+
+#include "content/browser/renderer_host/touchscreen_tap_suppression_controller.h"
+
+#include "content/browser/renderer_host/gesture_event_filter.h"
+#include "content/browser/renderer_host/tap_suppression_controller.h"
+#include "ui/base/gestures/gesture_configuration.h"
+
+namespace content {
+
+TouchscreenTapSuppressionController::TouchscreenTapSuppressionController(
+    GestureEventFilter* gef)
+    : gesture_event_filter_(gef),
+      controller_(new TapSuppressionController(this)) {
+}
+
+TouchscreenTapSuppressionController::~TouchscreenTapSuppressionController() {}
+
+void TouchscreenTapSuppressionController::GestureFlingCancel() {
+  controller_->GestureFlingCancel();
+}
+
+void TouchscreenTapSuppressionController::GestureFlingCancelAck(
+    bool processed) {
+  controller_->GestureFlingCancelAck(processed);
+}
+
+bool TouchscreenTapSuppressionController::ShouldDeferGestureTapDown(
+    const WebKit::WebGestureEvent& event) {
+  bool should_defer = controller_->ShouldDeferTapDown();
+  if (should_defer)
+    stashed_tap_down_ = event;
+  return should_defer;
+}
+
+bool TouchscreenTapSuppressionController::ShouldSuppressGestureTap() {
+  return controller_->ShouldSuppressTapUp();
+}
+
+bool TouchscreenTapSuppressionController::ShouldSuppressGestureTapCancel() {
+  return controller_->ShouldSuppressTapCancel();
+}
+
+int TouchscreenTapSuppressionController::MaxCancelToDownTimeInMs() {
+  return ui::GestureConfiguration::fling_max_cancel_to_down_time_in_ms();
+}
+
+int TouchscreenTapSuppressionController::MaxTapGapTimeInMs() {
+  return static_cast<int>(
+      ui::GestureConfiguration::semi_long_press_time_in_seconds() * 1000);
+}
+
+void TouchscreenTapSuppressionController::DropStashedTapDown() {
+}
+
+void TouchscreenTapSuppressionController::ForwardStashedTapDownForDeferral() {
+  gesture_event_filter_->ForwardGestureEventForDeferral(stashed_tap_down_);
+}
+
+void TouchscreenTapSuppressionController::ForwardStashedTapDownSkipDeferral() {
+  gesture_event_filter_->ForwardGestureEventSkipDeferral(stashed_tap_down_);
+}
+
+}  // namespace content