Touch gestures for System Tray/ IME/ Stylus/ Notifications

ash/system/tray/system_tray.cc

Index: ash/system/tray/system_tray.cc
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 77cc0342a6314dd3407551084dad72d4ab6c3cc1..1c4ae5a976e22747b3a8f61917aa8ac4d3b52bb1 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -625,14 +625,10 @@ void SystemTray::ActivateBubble() {
 }
 
 void SystemTray::OnGestureEvent(ui::GestureEvent* event) {
-  if (Shell::Get()
-          ->maximize_mode_controller()
-          ->IsMaximizeModeWindowManagerEnabled() &&
-      shelf_->IsHorizontalAlignment() && ProcessGestureEvent(*event)) {
+  if (ProcessGestureEvent(*event, false /* is_on_bubble */))
     event->SetHandled();
-  } else {
+  else
     TrayBackgroundView::OnGestureEvent(event);
-  }
 }
 
 gfx::Rect SystemTray::GetWorkAreaBoundsInScreen() const {
@@ -653,7 +649,17 @@ bool SystemTray::PerformAction(const ui::Event& event) {
   return true;
 }
 
-bool SystemTray::ProcessGestureEvent(const ui::GestureEvent& event) {
+bool SystemTray::ProcessGestureEvent(const ui::GestureEvent& event,
+                                     bool is_on_bubble) {
+  if (!Shell::Get()
+           ->maximize_mode_controller()
+           ->IsMaximizeModeWindowManagerEnabled() ||
+      !shelf_->IsHorizontalAlignment()) {
+    return false;
+  }
+
+  // Set |is_on_bubble_| before process the events.
+  is_on_bubble_ = is_on_bubble;
   if (event.type() == ui::ET_GESTURE_SCROLL_BEGIN)
     return StartGestureDrag(event);
 
@@ -678,29 +684,33 @@ bool SystemTray::ProcessGestureEvent(const ui::GestureEvent& event) {
 }
 
 bool SystemTray::StartGestureDrag(const ui::GestureEvent& gesture) {
-  // Close the system bubble if there is already a full one opened. And return
-  // false to let shelf handle the event.
-  if (HasSystemBubble() && full_system_tray_menu_) {
-    system_bubble_->bubble()->Close();
-    return false;
-  }
+  if (!is_on_bubble_) {
+    // Dragging happens on the system tray. Close the system bubble if there is
+    // already a full one opened. And return false to let shelf handle the
+    // event.
+    if (HasSystemBubble() && full_system_tray_menu_) {
+      system_bubble_->bubble()->Close();
+      return false;
+    }
 
-  // If the scroll sequence begins to scroll downward, return false so that the
-  // event will instead by handled by the shelf.
-  if (gesture.details().scroll_y_hint() > 0)
-    return false;
+    // If the scroll sequence begins to scroll downward, return false so that
+    // the event will instead by handled by the shelf.
+    if (gesture.details().scroll_y_hint() > 0)
+      return false;
+
+    ShowDefaultView(BUBBLE_CREATE_NEW);
+  }
 
   is_in_drag_ = true;
   gesture_drag_amount_ = 0.f;
-  ShowDefaultView(BUBBLE_CREATE_NEW);
   system_tray_bubble_bounds_ =
       system_bubble_->bubble_view()->GetWidget()->GetWindowBoundsInScreen();
-  SetBubbleBounds(gesture.location());
+  UpdateBubbleBounds();
   return true;
 }
 
 void SystemTray::UpdateGestureDrag(const ui::GestureEvent& gesture) {
-  SetBubbleBounds(gesture.location());
+  UpdateBubbleBounds();
   gesture_drag_amount_ += gesture.details().scroll_y();
 }
 
@@ -715,16 +725,13 @@ void SystemTray::CompleteGestureDrag(const ui::GestureEvent& gesture) {
   is_in_drag_ = false;
 }
 
-void SystemTray::SetBubbleBounds(const gfx::Point& location) {
-  gfx::Point location_in_screen_coordinates(location);
-  View::ConvertPointToScreen(this, &location_in_screen_coordinates);
-
-  // System tray bubble should not be dragged higher than its original height.
-  if (location_in_screen_coordinates.y() < system_tray_bubble_bounds_.y())
-    location_in_screen_coordinates.set_y(system_tray_bubble_bounds_.y());
-
+void SystemTray::UpdateBubbleBounds() {
   gfx::Rect bounds_on_location = system_tray_bubble_bounds_;
-  bounds_on_location.set_y(location_in_screen_coordinates.y());
+  // System tray bubble should not be dragged higher than its original height.
+  int bounds_y = (is_on_bubble_ ? system_tray_bubble_bounds_.y()
+                                : shelf_->GetIdealBounds().y()) +
+                 gesture_drag_amount_;
+  bounds_on_location.set_y(std::max(bounds_y, system_tray_bubble_bounds_.y()));
   system_bubble_->bubble_view()->GetWidget()->SetBounds(bounds_on_location);
 }
 
@@ -739,7 +746,11 @@ bool SystemTray::ShouldShowSystemBubbleAfterScrollSequence(
 
   DCHECK(sequence_end.type() == ui::ET_GESTURE_SCROLL_END ||
          sequence_end.type() == ui::ET_SCROLL_FLING_START);
-  // Show the system menu if it is already at least one-third visible.
+
+  // Keep the bubble's original state if the |gesture_drag_amount_| doesn't
+  // exceed one-third of the bubble's height.
+  if (is_on_bubble_)
+    return gesture_drag_amount_ < system_tray_bubble_bounds_.height() / 3.0;
   return -gesture_drag_amount_ >= system_tray_bubble_bounds_.height() / 3.0;
 }