1 files changed, 115 insertions, 0 deletions
diff --git a/chromium/content/browser/renderer_host/input/gesture_text_selector.cc b/chromium/content/browser/renderer_host/input/gesture_text_selector.cc
new file mode 100644
index 00000000000..67c4fe7ebb0
--- /dev/null
+++ b/chromium/content/browser/renderer_host/input/gesture_text_selector.cc
@@ -0,0 +1,115 @@
+// Copyright 2014 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/input/gesture_text_selector.h"
+
+#include "ui/events/event_constants.h"
+#include "ui/events/gesture_detection/gesture_detector.h"
+#include "ui/events/gesture_detection/gesture_provider_config_helper.h"
+#include "ui/events/gesture_detection/motion_event.h"
+
+using ui::GestureDetector;
+using ui::MotionEvent;
+
+namespace content {
+namespace {
+scoped_ptr<GestureDetector> CreateGestureDetector(
+    ui::GestureListener* listener) {
+  GestureDetector::Config config =
+      ui::DefaultGestureProviderConfig().gesture_detector_config;
+
+  ui::DoubleTapListener* null_double_tap_listener = nullptr;
+
+  // Doubletap, showpress and longpress detection are not required, and
+  // should be explicitly disabled for efficiency.
+  scoped_ptr<ui::GestureDetector> detector(
+      new ui::GestureDetector(config, listener, null_double_tap_listener));
+  detector->set_longpress_enabled(false);
+  detector->set_showpress_enabled(false);
+
+  return detector.Pass();
+}
+
+}  // namespace
+
+GestureTextSelector::GestureTextSelector(GestureTextSelectorClient* client)
+    : client_(client),
+      text_selection_triggered_(false),
+      secondary_button_pressed_(false),
+      anchor_x_(0.0f),
+      anchor_y_(0.0f) {
+  DCHECK(client);
+}
+
+GestureTextSelector::~GestureTextSelector() {
+}
+
+bool GestureTextSelector::OnTouchEvent(const MotionEvent& event) {
+  if (event.GetAction() == MotionEvent::ACTION_DOWN) {
+    // Only trigger selection on ACTION_DOWN to prevent partial touch or gesture
+    // sequences from being forwarded.
+    text_selection_triggered_ = ShouldStartTextSelection(event);
+    secondary_button_pressed_ =
+        event.GetButtonState() == MotionEvent::BUTTON_SECONDARY;
+    anchor_x_ = event.GetX();
+    anchor_y_ = event.GetY();
+  }
+
+  if (!text_selection_triggered_)
+    return false;
+
+  if (event.GetAction() == MotionEvent::ACTION_MOVE) {
+    secondary_button_pressed_ =
+        event.GetButtonState() == MotionEvent::BUTTON_SECONDARY;
+    if (!secondary_button_pressed_) {
+      anchor_x_ = event.GetX();
+      anchor_y_ = event.GetY();
+    }
+  }
+
+  if (!gesture_detector_)
+    gesture_detector_ = CreateGestureDetector(this);
+
+  gesture_detector_->OnTouchEvent(event);
+
+  // Always return true, even if |gesture_detector_| technically doesn't
+  // consume the event, to prevent a partial touch stream from being forwarded.
+  return true;
+}
+
+bool GestureTextSelector::OnSingleTapUp(const MotionEvent& e) {
+  DCHECK(text_selection_triggered_);
+  client_->LongPress(e.GetEventTime(), e.GetX(), e.GetY());
+  return true;
+}
+
+bool GestureTextSelector::OnScroll(const MotionEvent& e1,
+                                   const MotionEvent& e2,
+                                   float distance_x,
+                                   float distance_y) {
+  DCHECK(text_selection_triggered_);
+
+  // Return if Stylus button is not pressed.
+  if (!secondary_button_pressed_)
+    return true;
+
+  // TODO(changwan): check if we can show handles after the scroll finishes
+  // instead. Currently it is not possible as ShowSelectionHandles should
+  // be called before we change the selection.
+  client_->ShowSelectionHandlesAutomatically();
+  client_->SelectRange(anchor_x_, anchor_y_, e2.GetX(), e2.GetY());
+  return true;
+}
+
+// static
+bool GestureTextSelector::ShouldStartTextSelection(const MotionEvent& event) {
+  DCHECK_GT(event.GetPointerCount(), 0u);
+  // Currently we are supporting stylus-only cases.
+  const bool is_stylus = event.GetToolType(0) == MotionEvent::TOOL_TYPE_STYLUS;
+  const bool is_only_secondary_button_pressed =
+      event.GetButtonState() == MotionEvent::BUTTON_SECONDARY;
+  return is_stylus && is_only_secondary_button_pressed;
+}
+
+}  // namespace content