Implement overscroll support for the virtual keyboard.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // 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 "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 60 matching lines @@
 #include "ui/compositor/layer.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/gestures/gesture_recognizer.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/skia_util.h"
+#include "ui/keyboard/keyboard_controller.h"
+#include "ui/keyboard/keyboard_util.h"
 #include "ui/wm/public/activation_client.h"
 #include "ui/wm/public/scoped_tooltip_disabler.h"
 #include "ui/wm/public/tooltip_client.h"
 #include "ui/wm/public/transient_window_client.h"
 #include "ui/wm/public/window_types.h"
 
 #if defined(OS_WIN)
 #include "content/browser/accessibility/browser_accessibility_manager_win.h"
 #include "content/browser/accessibility/browser_accessibility_win.h"
 #include "content/browser/renderer_host/legacy_render_widget_host_win.h"
@@ skipping 1353 matching lines @@
 
   if (frame->software_frame_data) {
     DLOG(ERROR) << "Unable to use software frame in aura";
     RecordAction(
         base::UserMetricsAction("BadMessageTerminate_SharedMemoryAura"));
     host_->GetProcess()->ReceivedBadMessage();
     return;
   }
 }
 
+float RenderWidgetHostViewAura::GetOverdrawBottomHeight() const {
+  float overdraw = 0.f;
+#if defined(OS_CHROMEOS)
+  gfx::Rect window_bounds = window_->GetBoundsInScreen();
+  gfx::Rect intersect = gfx::IntersectRects(window_bounds,
+                                            virtual_keyboard_bounds_);
+  if (intersect.height() > 0 && intersect.height() < window_bounds.height())
+    overdraw = intersect.height();
+#endif
+  return overdraw;
+}
+
 #if defined(OS_WIN)
 void RenderWidgetHostViewAura::SetParentNativeViewAccessible(
     gfx::NativeViewAccessible accessible_parent) {
   if (GetBrowserAccessibilityManager()) {
     GetBrowserAccessibilityManager()->ToBrowserAccessibilityManagerWin()
         ->set_parent_iaccessible(accessible_parent);
   }
 }
 
 gfx::NativeViewId RenderWidgetHostViewAura::GetParentForWindowlessPlugin()
@@ skipping 1627 matching lines @@
   if (cursor_client) {
     cursor_client->AddObserver(this);
     NotifyRendererOfCursorVisibilityState(cursor_client->IsCursorVisible());
   }
   if (HasFocus()) {
     ui::InputMethod* input_method = GetInputMethod();
     if (input_method)
       input_method->SetFocusedTextInputClient(this);
   }
 
+  keyboard::KeyboardController* keyboard_controller =
+      keyboard::KeyboardController::GetInstance();
+  if (keyboard_controller)
+    keyboard_controller->AddObserver(this);
+
 #if defined(OS_WIN)
   // The parent may have changed here. Ensure that the legacy window is
   // reparented accordingly.
   if (legacy_render_widget_host_HWND_)
     legacy_render_widget_host_HWND_->UpdateParent(
         reinterpret_cast<HWND>(GetNativeViewId()));
 #endif
 
   ui::Compositor* compositor = GetCompositor();
   if (compositor) {
     DCHECK(!vsync_manager_);
     vsync_manager_ = compositor->vsync_manager();
     vsync_manager_->AddObserver(this);
   }
 }
 
 void RenderWidgetHostViewAura::RemovingFromRootWindow() {
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(window_->GetRootWindow());
   if (cursor_client)
     cursor_client->RemoveObserver(this);
 
   DetachFromInputMethod();
 
+  keyboard::KeyboardController* keyboard_controller =
+      keyboard::KeyboardController::GetInstance();
+  if (keyboard_controller)
+    keyboard_controller->RemoveObserver(this);
+
   window_->GetHost()->RemoveObserver(this);
   RunOnCommitCallbacks();
   resize_lock_.reset();
   host_->WasResized();
   ui::Compositor* compositor = GetCompositor();
   if (compositor && compositor->HasObserver(this))
     compositor->RemoveObserver(this);
 
 #if defined(OS_WIN)
   // Update the legacy window's parent temporarily to the desktop window. It
@@ skipping 70 matching lines @@
   // The new_layer is the one that will be used by our Window, so that's the one
   // that should keep our frame. old_layer will be returned to the
   // RecreateLayer caller, and should have a copy.
   if (frame_provider_.get()) {
     new_layer->SetShowDelegatedContent(frame_provider_.get(),
                                        current_frame_size_in_dip_);
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// RenderWidgetHostViewAura, keyboard::KeyboardControllerObserver
+// implementation:
+
+void RenderWidgetHostViewAura::OnKeyboardBoundsChanging(
+    const gfx::Rect& new_bounds) {
+#if defined(OS_CHROMEOS)
+  if (!keyboard::IsKeyboardOverscrollEnabled())
+    return;
+  if (virtual_keyboard_bounds_ != new_bounds) {
+    virtual_keyboard_bounds_ = new_bounds;
+    host_->WasResized();
+  }
+#endif
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView* RenderWidgetHostView::CreateViewForWidget(
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content