GTK: Implement OnDragCanceled() for autocomplete popup view on linux.

Pressing escape while performing a drag inside the autocomplete popup should
abort the drag and not changed the selected item. This is a rewrite of
pkasting's r37724 for GTK instead of views.

BUG=35710
TEST=none

Review URL: http://codereview.chromium.org/1758002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@45322 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 9 insertions, 1 deletions

diff --git a/chrome/browser/autocomplete/autocomplete_popup_view_gtk.h b/chrome/browser/autocomplete/autocomplete_popup_view_gtk.h
index f46cfb2..a56a55a 100644
--- a/chrome/browser/autocomplete/autocomplete_popup_view_gtk.h
+++ b/chrome/browser/autocomplete/autocomplete_popup_view_gtk.h
@@ -31,7 +31,7 @@ class AutocompletePopupViewGtk : public AutocompletePopupView {
   virtual void InvalidateLine(size_t line);
   virtual void UpdatePopupAppearance();
   virtual void PaintUpdatesNow();
-  virtual void OnDragCanceled() {}
+  virtual void OnDragCanceled();
   virtual AutocompletePopupModel* GetModel();
 
  private:
@@ -87,6 +87,14 @@ class AutocompletePopupViewGtk : public AutocompletePopupView {
   // The pango layout object created from the window, cached across exposes.
   PangoLayout* layout_;
 
+  // If the user cancels a dragging action (i.e. by pressing ESC), we don't have
+  // a convenient way to release mouse capture. Instead we use this flag to
+  // simply ignore all remaining drag events, and the eventual mouse release
+  // event. Since OnDragCanceled() can be called when we're not dragging, this
+  // flag is reset to false on a mouse pressed event, to make sure we don't
+  // erroneously ignore the next drag.
+  bool ignore_mouse_drag_;
+
   // Whether our popup is currently open / shown, or closed / hidden.
   bool opened_;