Preliminary interactive layout of window manager's demo_launcher

mojo/examples/png_viewer/png_viewer.cc

Index: mojo/examples/png_viewer/png_viewer.cc
diff --git a/mojo/examples/png_viewer/png_viewer.cc b/mojo/examples/png_viewer/png_viewer.cc
index a6f87417bad4f50a075919dd017923d6c46363a3..6098f868530a81d888a487cfcc66fb4602acac78 100644
--- a/mojo/examples/png_viewer/png_viewer.cc
+++ b/mojo/examples/png_viewer/png_viewer.cc
@@ -10,6 +10,7 @@
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/services/public/cpp/view_manager/node.h"
+#include "mojo/services/public/cpp/view_manager/node_observer.h"
 #include "mojo/services/public/cpp/view_manager/types.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
 #include "mojo/services/public/cpp/view_manager/view_manager.h"
@@ -111,7 +112,8 @@ class NavigatorImpl : public InterfaceImpl<navigation::Navigator> {
 };
 
 class PNGViewer : public ApplicationDelegate,
-                  public view_manager::ViewManagerDelegate {
+                  public view_manager::ViewManagerDelegate,
+                  public view_manager::NodeObserver {
  public:
   PNGViewer() : content_view_(NULL), zoom_percentage_(kDefaultZoomPercentage) {}
   virtual ~PNGViewer() {}
@@ -164,6 +166,7 @@ class PNGViewer : public ApplicationDelegate,
     content_view_ = view_manager::View::Create(view_manager);
     root->SetActiveView(content_view_);
     content_view_->SetColor(SK_ColorGRAY);
+    root->AddObserver(this);

[sky, 2014/07/14 19:15:28]

Same thing about removing observer.

[hansmuller, 2014/07/14 22:16:42]

Done.

     if (!bitmap_.isNull())
       DrawBitmap();
   }
@@ -189,6 +192,12 @@ class PNGViewer : public ApplicationDelegate,
     content_view_->SetContents(skia::GetTopDevice(*canvas)->accessBitmap(true));
   }
 
+  virtual void OnNodeBoundsChanged(view_manager::Node* node,
+                                   const gfx::Rect&,
+                                   const gfx::Rect&) OVERRIDE {
+    DrawBitmap();
+  }
+
   view_manager::View* content_view_;
   SkBitmap bitmap_;
   uint16_t zoom_percentage_;