Implemented swipe to close in overview mode.

ash/wm/overview/window_selector_item.h

 // Copyright 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.
 
 #ifndef ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_
 
 #include "ash/ash_export.h"
 #include "ash/wm/overview/scoped_transform_overview_window.h"
 #include "base/compiler_specific.h"
@@ skipping 15 matching lines @@
 }
 
 namespace ash {
 
 // This class represents an item in overview mode.
 class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
                                       public aura::WindowObserver {
  public:
   class OverviewLabelButton : public views::LabelButton {
    public:
-    OverviewLabelButton(views::ButtonListener* listener,
+    OverviewLabelButton(WindowSelectorItem* selector_item,
                         const base::string16& text);
 
     ~OverviewLabelButton() override;
 
     void set_top_padding(int top_padding) { top_padding_ = top_padding; }
 
+  // views::LabelButton:
+  void OnGestureEvent(ui::GestureEvent* event) override;

[flackr, 2015/02/12 18:52:43]

nit: indentation.

[bruthig, 2015/02/12 20:34:16]

Done.

+
    protected:
     // views::LabelButton:
     gfx::Rect GetChildAreaBounds() override;
 
    private:
+    // The WindowSelectorItem that the touch gestures are delegated to.
+    // Not owned.
+    WindowSelectorItem* selector_item_;
+
+    // The original X location for a scroll begin event. |original_x_| is in the
+    // local coordinate space of |this|.
+    float scroll_x_origin_;
+
     // Padding on top of the button.
     int top_padding_;
 
     DISALLOW_COPY_AND_ASSIGN(OverviewLabelButton);
   };
 
   explicit WindowSelectorItem(aura::Window* window);
   ~WindowSelectorItem() override;
 
   aura::Window* GetWindow();
@@ skipping 29 matching lines @@
   // label is read.
   void SendFocusAlert() const;
 
   // Sets if the item is dimmed in the overview. Changing the value will also
   // change the visibility of the transform windows.
   void SetDimmed(bool dimmed);
   bool dimmed() const { return dimmed_; }
 
   const gfx::Rect& target_bounds() const { return target_bounds_; }
 
+  // Called when a touch scroll begin event occurs on this selector item.
+  void OnScrollBegin();
+
+  // Called when a touch scroll update event occurs on this selector item.
+  void OnScrollUpdate(int delta_x);
+
+  // Called when a touch scroll end event occurs on this selector item. This may
+  // cause the window to be closed.
+  void OnScrollEnd(int delta_x);
+
+  // Called when a touch fling event occurs on this selector item. This may
+  // cause the window to be closed.
+  void OnFling(int delta_x, float velocity_x);

[flackr, 2015/02/12 18:52:43]

nit: I kind of feel like we should just have an OnGestureEvent on this class,
rather than splitting it up in OverviewLabelEvent. That would allow easily
changing it if we had a better way of intercepting the gesture events (e.g.
could probably clean this up by instantiating an event targeter or pretarget
event handler to handle the scroll related gesture events on that window).

[bruthig, 2015/02/12 20:34:16]

Done.

+
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // aura::WindowObserver:
   void OnWindowDestroying(aura::Window* window) override;
   void OnWindowTitleChanged(aura::Window* window) override;
 
  private:
   friend class WindowSelectorTest;
 
@@ skipping 13 matching lines @@
   // Creates the window label.
   void CreateWindowLabel(const base::string16& title);
 
   // Updates the close button's bounds. Any change in bounds will be animated
   // from the current bounds to the new bounds as per the |animation_type|.
   void UpdateCloseButtonLayout(OverviewAnimationType animation_type);
 
   // Updates the close buttons accessibility name.
   void UpdateCloseButtonAccessibilityName();
 
+  // Animates the |transform_window_| back to it's original overview mode
+  // position.
+  void ResetScrolledWindow();
+
+  // Returns the minimum distance at which a scroll gesture will cause this
+  // selector item to be closed.
+  int GetMinimumCloseDistance() const;
+
   // True if the item is being shown in the overview, false if it's being
   // filtered.
   bool dimmed_;
 
   // The root window this item is being displayed on.
   aura::Window* root_window_;
 
   // The contained Window's wrapper.
   ScopedTransformOverviewWindow transform_window_;
 
@@ skipping 17 matching lines @@
   // An easy to access close button for the window in this item. Owned by the
   // close_button_widget_.
   views::ImageButton* close_button_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorItem);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_ITEM_H_