athena: Add shadows to the windows in overview mode.

athena/wm/window_overview_mode.cc

Index: athena/wm/window_overview_mode.cc
diff --git a/athena/wm/window_overview_mode.cc b/athena/wm/window_overview_mode.cc
index 8c98bcb0190a31cb37947aec481a894f7fadda2d..dc984ec4b2ba3af6e2d88cd9405d0db77323ce34 100644
--- a/athena/wm/window_overview_mode.cc
+++ b/athena/wm/window_overview_mode.cc
@@ -17,6 +17,7 @@
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/transform.h"
+#include "ui/wm/core/shadow.h"
 
 namespace {
 
@@ -102,6 +103,7 @@ class WindowOverviewModeImpl : public WindowOverviewMode,
     // state on the windows.
     ComputeTerminalStatesForAllWindows();
     SetInitialWindowStates();
+    AddShadowsForWindows();
   }
 
   virtual ~WindowOverviewModeImpl() {
@@ -187,6 +189,26 @@ class WindowOverviewModeImpl : public WindowOverviewMode,
     }
   }
 
+  void AddShadowsForWindows() {
+    aura::Window::Windows windows = container_->children();
+    if (windows.empty())
+      return;
+    std::for_each(
+        windows.begin(),
+        windows.end(),
+        std::bind1st(std::mem_fun(&WindowOverviewModeImpl::AddShadowForWindow),
+                     this));
+  }
+
+  void AddShadowForWindow(aura::Window* window) {
+    wm::Shadow* shadow = new wm::Shadow();
+    shadows_.push_back(shadow);
+    shadow->Init(wm::Shadow::STYLE_ACTIVE);
+    shadow->SetContentBounds(gfx::Rect(window->bounds().size()));
+    shadow->layer()->SetVisible(true);
+    window->layer()->Add(shadow->layer());
+  }
+
   aura::Window* SelectWindowAt(ui::LocatedEvent* event) {
     CHECK_EQ(container_, event->target());
     // Find the old targeter to find the target of the event.
@@ -229,6 +251,7 @@ class WindowOverviewModeImpl : public WindowOverviewMode,
   aura::Window* container_;
   WindowOverviewModeDelegate* delegate_;
   scoped_ptr<aura::ScopedWindowTargeter> scoped_targeter_;
+  ScopedVector<wm::Shadow> shadows_;

[oshima, 2014/06/12 19:15:24]

can't you store the shadow in the state object? 

[sadrul, 2014/06/12 19:37:51]

Good idea! done.

 
   DISALLOW_COPY_AND_ASSIGN(WindowOverviewModeImpl);
 };