Implemented swipe to close in overview mode.

ash/wm/overview/window_selector_item.h

Index: ash/wm/overview/window_selector_item.h
diff --git a/ash/wm/overview/window_selector_item.h b/ash/wm/overview/window_selector_item.h
index 063b141e92a594c728efcd9633144251fd19bc28..a4ed2c89102fbf9bd99b2ce422b70ecadcf74b1c 100644
--- a/ash/wm/overview/window_selector_item.h
+++ b/ash/wm/overview/window_selector_item.h
@@ -33,18 +33,29 @@ class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
  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_;
 
@@ -94,6 +105,20 @@ class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
 
   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;
 
@@ -127,6 +152,14 @@ class ASH_EXPORT WindowSelectorItem : public views::ButtonListener,
   // 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_;