Preliminary interactive layout of window manager's demo_launcher

mojo/examples/media_viewer/media_viewer.cc

 // Copyright 2014 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.
 
 #include <map>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mojo/examples/media_viewer/media_viewer.mojom.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/bindings/interface_impl.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/view.h"
 #include "mojo/services/public/cpp/view_manager/view_manager.h"
 #include "mojo/services/public/cpp/view_manager/view_manager_delegate.h"
 #include "mojo/services/public/interfaces/navigation/navigation.mojom.h"
 #include "mojo/views/native_widget_view_manager.h"
 #include "mojo/views/views_init.h"
 #include "skia/ext/platform_canvas.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 168 matching lines @@
       navigation::NavigationDetailsPtr navigation_details,
       navigation::ResponseDetailsPtr response_details) OVERRIDE;
 
   MediaViewer* viewer_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigatorImpl);
 };
 
 class MediaViewer : public ApplicationDelegate,
                     public view_manager::ViewManagerDelegate,
-                    public ControlPanel::Delegate {
+                    public ControlPanel::Delegate,
+                    public view_manager::NodeObserver {
  public:
   MediaViewer() : app_(NULL),
                   view_manager_(NULL),
+                  root_node_(NULL),
                   control_node_(NULL),
                   content_node_(NULL),
                   control_panel_(this) {
     handler_map_["image/png"] = "mojo:mojo_png_viewer";
   }
 
-  virtual ~MediaViewer() {}
+  virtual ~MediaViewer() {
+    if (root_node_)
+      root_node_->RemoveObserver(this);
+  }
 
   void Navigate(
       uint32_t node_id,
       navigation::NavigationDetailsPtr navigation_details,
       navigation::ResponseDetailsPtr response_details) {
     // TODO(yzshen): This shouldn't be needed once FIFO is ready.
     if (!view_manager_) {
       pending_navigate_request_.reset(new PendingNavigateRequest);
       pending_navigate_request_->node_id = node_id;
       pending_navigate_request_->navigation_details = navigation_details.Pass();
@@ skipping 37 matching lines @@
     views_init_.reset(new ViewsInit);
   }
 
   virtual bool ConfigureIncomingConnection(ApplicationConnection* connection)
       OVERRIDE {
     connection->AddService<NavigatorImpl>(this);
     view_manager::ViewManager::ConfigureIncomingConnection(connection, this);
     return true;
   }
 
+  void LayoutNodes() {
+    view_manager::Node* root = content_node_->parent();
+    gfx::Rect control_bounds(root->bounds().width(), 28);
+    control_node_->SetBounds(control_bounds);
+    gfx::Rect content_bounds(0, control_bounds.height(), root->bounds().width(),
+                             root->bounds().height() - control_bounds.height());
+    content_node_->SetBounds(content_bounds);
+  }
+
   // Overridden from view_manager::ViewManagerDelegate:
   virtual void OnRootAdded(view_manager::ViewManager* view_manager,
                            view_manager::Node* root) OVERRIDE {
+    root_node_ = root;
     view_manager_ = view_manager;
 
     control_node_ = view_manager::Node::Create(view_manager_);
-    root->AddChild(control_node_);
-    gfx::Rect control_bounds(root->bounds().width(), 28);
-    control_node_->SetBounds(control_bounds);
+    root_node_->AddChild(control_node_);
+
+    content_node_ = view_manager::Node::Create(view_manager_);
+    root_node_->AddChild(content_node_);
+
     control_node_->SetActiveView(view_manager::View::Create(view_manager_));
-
     control_panel_.Initialize(control_node_);
 
-    content_node_ = view_manager::Node::Create(view_manager_);
-    root->AddChild(content_node_);
-    gfx::Rect content_bounds(0, control_bounds.height(), root->bounds().width(),
-                             root->bounds().height() - control_bounds.height());
-    content_node_->SetBounds(content_bounds);
+    LayoutNodes();
+    root_node_->AddObserver(this);
 
     if (pending_navigate_request_) {
       scoped_ptr<PendingNavigateRequest> request(
           pending_navigate_request_.release());
 
       Navigate(request->node_id, request->navigation_details.Pass(),
                request->response_details.Pass());
     }
   }
   virtual void OnViewManagerDisconnected(
       view_manager::ViewManager* view_manager) OVERRIDE {
     DCHECK_EQ(view_manager_, view_manager);
     view_manager_ = NULL;
     base::MessageLoop::current()->Quit();
   }
 
   // Overridden from ControlPanel::Delegate:
   virtual void ButtonPressed(ControlPanel::ControlType type) OVERRIDE {
     switch (type) {
       case ControlPanel::CONTROL_ZOOM_IN:
         zoomable_media_->ZoomIn();
         break;
       case ControlPanel::CONTROL_ACTUAL_SIZE:
-        zoomable_media_->ZoomToActualSize();
+       zoomable_media_->ZoomToActualSize();
         break;
       case ControlPanel::CONTROL_ZOOM_OUT:
         zoomable_media_->ZoomOut();
         break;
       default:
         NOTIMPLEMENTED();
     }
   }
 
+  // NodeObserver:
+  virtual void OnNodeBoundsChanged(view_manager::Node* node,
+                                   const gfx::Rect& old_bounds,
+                                   const gfx::Rect& new_bounds) OVERRIDE {
+    LayoutNodes();
+  }
+  virtual void OnNodeDestroyed(view_manager::Node* node) OVERRIDE {
+    DCHECK_EQ(node, root_node_);
+    node->RemoveObserver(this);
+    root_node_ = NULL;
+  }
+
   std::string GetHandlerForContentType(const std::string& content_type) {
     HandlerMap::const_iterator it = handler_map_.find(content_type);
     return it != handler_map_.end() ? it->second : std::string();
   }
 
   ApplicationImpl* app_;
   scoped_ptr<ViewsInit> views_init_;
   view_manager::ViewManager* view_manager_;
+  view_manager::Node* root_node_;
   view_manager::Node* control_node_;
   view_manager::Node* content_node_;
   ControlPanel control_panel_;
   ZoomableMediaPtr zoomable_media_;
   HandlerMap handler_map_;
   scoped_ptr<PendingNavigateRequest> pending_navigate_request_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaViewer);
 };
 
 void NavigatorImpl::Navigate(
     uint32_t node_id,
     navigation::NavigationDetailsPtr navigation_details,
     navigation::ResponseDetailsPtr response_details) {
   viewer_->Navigate(node_id, navigation_details.Pass(),
                     response_details.Pass());
 }
 
 }  // namespace examples
 
 // static
 ApplicationDelegate* ApplicationDelegate::Create() {
   return new examples::MediaViewer;
 }
 
 }  // namespace mojo