1 files changed, 166 insertions, 0 deletions
diff --git a/ui/views/corewm/shadow_controller.cc b/ui/views/corewm/shadow_controller.cc
new file mode 100644
index 0000000..2e97aac
--- /dev/null
+++ b/ui/views/corewm/shadow_controller.cc
@@ -0,0 +1,166 @@
+// 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.
+
+#include "ui/views/corewm/shadow_controller.h"
+
+#include <utility>
+
+#include "base/command_line.h"
+#include "base/logging.h"
+#include "ui/aura/client/activation_client.h"
+#include "ui/aura/env.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura/window.h"
+#include "ui/compositor/layer.h"
+#include "ui/views/corewm/shadow.h"
+#include "ui/views/corewm/shadow_types.h"
+
+using std::make_pair;
+
+namespace views {
+namespace corewm {
+
+namespace {
+
+ShadowType GetShadowTypeFromWindow(aura::Window* window) {
+  switch (window->type()) {
+    case aura::client::WINDOW_TYPE_NORMAL:
+    case aura::client::WINDOW_TYPE_PANEL:
+    case aura::client::WINDOW_TYPE_MENU:
+    case aura::client::WINDOW_TYPE_TOOLTIP:
+      return SHADOW_TYPE_RECTANGULAR;
+    default:
+      break;
+  }
+  return SHADOW_TYPE_NONE;
+}
+
+bool ShouldUseSmallShadowForWindow(aura::Window* window) {
+  switch (window->type()) {
+    case aura::client::WINDOW_TYPE_MENU:
+    case aura::client::WINDOW_TYPE_TOOLTIP:
+      return true;
+    default:
+      break;
+  }
+  return false;
+}
+
+// Returns the shadow style to be applied to |losing_active| when it is losing
+// active to |gaining_active|. |gaining_active| may be of a type that hides when
+// inactive, and as such we do not want to render |losing_active| as inactive.
+Shadow::Style GetShadowStyleForWindowLosingActive(
+    aura::Window* losing_active,
+    aura::Window* gaining_active) {
+  if (gaining_active && aura::client::GetHideOnDeactivate(gaining_active)) {
+    aura::Window::Windows::const_iterator it =
+        std::find(losing_active->transient_children().begin(),
+                  losing_active->transient_children().end(),
+                  gaining_active);
+    if (it != losing_active->transient_children().end())
+      return Shadow::STYLE_ACTIVE;
+  }
+  return Shadow::STYLE_INACTIVE;
+}
+
+}  // namespace
+
+ShadowController::ShadowController(aura::RootWindow* root_window)
+    : ALLOW_THIS_IN_INITIALIZER_LIST(observer_manager_(this)),
+      root_window_(root_window) {
+  aura::Env::GetInstance()->AddObserver(this);
+  // Watch for window activation changes.
+  aura::client::GetActivationClient(root_window_)->AddObserver(this);
+}
+
+ShadowController::~ShadowController() {
+  aura::client::GetActivationClient(root_window_)->RemoveObserver(this);
+  aura::Env::GetInstance()->RemoveObserver(this);
+}
+
+void ShadowController::OnWindowInitialized(aura::Window* window) {
+  observer_manager_.Add(window);
+  SetShadowType(window, GetShadowTypeFromWindow(window));
+  HandlePossibleShadowVisibilityChange(window);
+}
+
+void ShadowController::OnWindowPropertyChanged(aura::Window* window,
+                                               const void* key,
+                                               intptr_t old) {
+  if (key == kShadowTypeKey) {
+    HandlePossibleShadowVisibilityChange(window);
+    return;
+  }
+}
+
+void ShadowController::OnWindowBoundsChanged(aura::Window* window,
+                                             const gfx::Rect& old_bounds,
+                                             const gfx::Rect& new_bounds) {
+  Shadow* shadow = GetShadowForWindow(window);
+  if (shadow)
+    shadow->SetContentBounds(gfx::Rect(new_bounds.size()));
+}
+
+void ShadowController::OnWindowDestroyed(aura::Window* window) {
+  window_shadows_.erase(window);
+  observer_manager_.Remove(window);
+}
+
+void ShadowController::OnWindowActivated(aura::Window* gaining_active,
+                                         aura::Window* losing_active) {
+  if (gaining_active) {
+    Shadow* shadow = GetShadowForWindow(gaining_active);
+    if (shadow && !ShouldUseSmallShadowForWindow(gaining_active))
+      shadow->SetStyle(Shadow::STYLE_ACTIVE);
+  }
+  if (losing_active) {
+    Shadow* shadow = GetShadowForWindow(losing_active);
+    if (shadow && !ShouldUseSmallShadowForWindow(losing_active)) {
+      shadow->SetStyle(GetShadowStyleForWindowLosingActive(losing_active,
+                                                           gaining_active));
+    }
+  }
+}
+
+bool ShadowController::ShouldShowShadowForWindow(aura::Window* window) const {
+  const ShadowType type = GetShadowType(window);
+  switch (type) {
+    case SHADOW_TYPE_NONE:
+      return false;
+    case SHADOW_TYPE_RECTANGULAR:
+      return true;
+    default:
+      NOTREACHED() << "Unknown shadow type " << type;
+      return false;
+  }
+}
+
+Shadow* ShadowController::GetShadowForWindow(aura::Window* window) {
+  WindowShadowMap::const_iterator it = window_shadows_.find(window);
+  return it != window_shadows_.end() ? it->second.get() : NULL;
+}
+
+void ShadowController::HandlePossibleShadowVisibilityChange(
+    aura::Window* window) {
+  const bool should_show = ShouldShowShadowForWindow(window);
+  Shadow* shadow = GetShadowForWindow(window);
+  if (shadow)
+    shadow->layer()->SetVisible(should_show);
+  else if (should_show && !shadow)
+    CreateShadowForWindow(window);
+}
+
+void ShadowController::CreateShadowForWindow(aura::Window* window) {
+  linked_ptr<Shadow> shadow(new Shadow());
+  window_shadows_.insert(make_pair(window, shadow));
+
+  shadow->Init(ShouldUseSmallShadowForWindow(window) ?
+               Shadow::STYLE_SMALL : Shadow::STYLE_ACTIVE);
+  shadow->SetContentBounds(gfx::Rect(window->bounds().size()));
+  shadow->layer()->SetVisible(ShouldShowShadowForWindow(window));
+  window->layer()->Add(shadow->layer());
+}
+
+}  // namespace corewm
+}  // namespace views