Add gesture support in views::ResizeArea

ui/views/controls/resize_area.cc

Index: ui/views/controls/resize_area.cc
diff --git a/ui/views/controls/resize_area.cc b/ui/views/controls/resize_area.cc
index 3698078d709d6986907ef91eabafdb0e110cc3e2..06c0325fea38f89ea9da767478384578afb8c526 100644
--- a/ui/views/controls/resize_area.cc
+++ b/ui/views/controls/resize_area.cc
@@ -14,9 +14,6 @@ namespace views {
 
 const char ResizeArea::kViewClassName[] = "ResizeArea";
 
-////////////////////////////////////////////////////////////////////////////////
-// ResizeArea
-
 ResizeArea::ResizeArea(ResizeAreaDelegate* delegate)
     : delegate_(delegate),
       initial_position_(0) {
@@ -34,17 +31,25 @@ gfx::NativeCursor ResizeArea::GetCursor(const ui::MouseEvent& event) {
                    : 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;
 }
 
@@ -76,4 +81,10 @@ void ResizeArea::ReportResizeAmount(int resize_amount, bool last_update) {
                       last_update);
 }
 
+void ResizeArea::SetInitialPosition(int event_x) {
+  gfx::Point point(event_x, 0);
+  View::ConvertPointToScreen(this, &point);
+  initial_position_ = point.x();
+}
+
 }  // namespace views