[Reland] Add gesture support in views::ResizeArea

ui/views/controls/resize_area.cc

 // Copyright (c) 2012 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 "ui/views/controls/resize_area.h"
 
 #include "base/logging.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/base/cursor/cursor.h"
 #include "ui/views/controls/resize_area_delegate.h"
 #include "ui/views/native_cursor.h"
 
 namespace views {
 
 const char ResizeArea::kViewClassName[] = "ResizeArea";
 
-////////////////////////////////////////////////////////////////////////////////
-// ResizeArea
-
 ResizeArea::ResizeArea(ResizeAreaDelegate* delegate)
     : delegate_(delegate),
       initial_position_(0) {
 }
 
 ResizeArea::~ResizeArea() {
 }
 
 const char* ResizeArea::GetClassName() const {
   return kViewClassName;
 }
 
 gfx::NativeCursor ResizeArea::GetCursor(const ui::MouseEvent& event) {
   return enabled() ? GetNativeEastWestResizeCursor()
                    : gfx::kNullCursor;
 }
 
+void ResizeArea::OnGestureEvent(ui::GestureEvent* event) {
+  if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
+    SetInitialPosition(event->x());
+    event->SetHandled();
+  } else if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
+             event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
+    ReportResizeAmount(event->x(), false);
+    event->SetHandled();
+  } else if (event->type() == ui::ET_GESTURE_END) {
+    ReportResizeAmount(event->x(), true);
+    event->SetHandled();
+  }
+}
+
 bool ResizeArea::OnMousePressed(const ui::MouseEvent& event) {
   if (!event.IsOnlyLeftMouseButton())
     return false;
 
-  // The resize area obviously will move once you start dragging so we need to
-  // convert coordinates to screen coordinates so that we don't lose our
-  // bearings.
-  gfx::Point point(event.x(), 0);
-  View::ConvertPointToScreen(this, &point);
-  initial_position_ = point.x();
-
+  SetInitialPosition(event.x());
   return true;
 }
 
 bool ResizeArea::OnMouseDragged(const ui::MouseEvent& event) {
   if (!event.IsLeftMouseButton())
     return false;
 
   ReportResizeAmount(event.x(), false);
   return true;
 }
@@ skipping 11 matching lines @@
 }
 
 void ResizeArea::ReportResizeAmount(int resize_amount, bool last_update) {
   gfx::Point point(resize_amount, 0);
   View::ConvertPointToScreen(this, &point);
   resize_amount = point.x() - initial_position_;
   delegate_->OnResize(base::i18n::IsRTL() ? -resize_amount : resize_amount,
                       last_update);
 }
 
+void ResizeArea::SetInitialPosition(int event_x) {
+  gfx::Point point(event_x, 0);
+  View::ConvertPointToScreen(this, &point);
+  initial_position_ = point.x();
+}
+
 }  // namespace views