Zoom Extension API (chrome)

chrome/browser/ui/zoom/zoom_observer.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
 #define CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_
 
+#include "chrome/browser/ui/zoom/zoom_controller.h"
+
 namespace content {
 class WebContents;
 }
 
 // Interface for objects that wish to be notified of changes in ZoomController.
 class ZoomObserver {
  public:
+  struct OnZoomChangedEventData {

[Dan Beam, 2014/07/03 01:28:53]

nit: ZoomChangeData or ZoomChangeEventData

[wjmaclean, 2014/07/03 19:37:21]

Done.

+    OnZoomChangedEventData(content::WebContents* web_contents,
+                           double old_zoom_level,
+                           double new_zoom_level,
+                           ZoomController::ZoomMode zoom_mode,
+                           bool can_show_bubble)
+        : web_contents_(web_contents),
+          old_zoom_level_(old_zoom_level),
+          new_zoom_level_(new_zoom_level),
+          zoom_mode_(zoom_mode),
+          can_show_bubble_(can_show_bubble) {}
+    content::WebContents* web_contents_;
+    double old_zoom_level_;
+    double new_zoom_level_;
+    ZoomController::ZoomMode zoom_mode_;
+    bool can_show_bubble_;

[Dan Beam, 2014/07/03 01:28:53]

_ implies these are private but default access in a struct is public (classes
are private by default).

[wjmaclean, 2014/07/03 19:37:21]

Done.

+  };

[Dan Beam, 2014/07/03 01:28:53]

struct OnZoomChangedEventData {
  content::WebContents* web_contents;
  double old_zoom_level;
  double new_zoom_level;
  ZoomController::ZoomMode zoom_mode;
  bool can_show_bubble;
};

should just magically work...

[wjmaclean, 2014/07/03 19:37:21]

Not sure I follow ... work in what sense?

[Dan Beam, 2014/07/07 17:04:17]

no ctor or initializer list necessary

+
   // Notification that the zoom percentage has changed.
-  virtual void OnZoomChanged(content::WebContents* source,
-                             bool can_show_bubble) = 0;
+  virtual void OnZoomChanged(const OnZoomChangedEventData& data) {}
 
  protected:
   virtual ~ZoomObserver() {}
 };
 
 #endif  // CHROME_BROWSER_UI_ZOOM_ZOOM_OBSERVER_H_