Move ash specific cursor code to CursorManager.

Main changes are as follows.
- Move the responsibility of managing cursors to ash::CursorManager from aura::RootWindowHostLinux.
- Set the same cursor to all root windows with CursorManager so that cursor is updated properly while dragging across displays
- Introduce CursorLoader class, which implements platform specific cursor loading.
- Add SetDeviceScaleFactor to CursorClient, which sets the device scale factor used for the cursor.

BUG=132862,144756


Review URL: https://chromiumcodereview.appspot.com/10919135

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@156109 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 204 insertions, 3 deletions

diff --git a/ash/wm/cursor_manager.cc b/ash/wm/cursor_manager.cc
index 1ebc72b..3afee4b 100644
--- a/ash/wm/cursor_manager.cc
+++ b/ash/wm/cursor_manager.cc
@@ -5,8 +5,10 @@
 #include "ash/wm/cursor_manager.h"
 
 #include "ash/wm/cursor_delegate.h"
+#include "ash/wm/image_cursors.h"
 #include "base/logging.h"
 #include "ui/aura/env.h"
+#include "ui/base/cursor/cursor.h"
 
 namespace ash {
 
@@ -15,7 +17,9 @@ CursorManager::CursorManager()
       cursor_lock_count_(0),
       did_cursor_change_(false),
       cursor_to_set_on_unlock_(0),
-      cursor_visible_(true) {
+      cursor_visible_(true),
+      current_cursor_(ui::kCursorNone),
+      image_cursors_(new ImageCursors) {
 }
 
 CursorManager::~CursorManager() {
@@ -42,7 +46,7 @@ void CursorManager::UnlockCursor() {
 void CursorManager::SetCursor(gfx::NativeCursor cursor) {
   if (cursor_lock_count_ == 0) {
     if (delegate_)
-      delegate_->SetCursor(cursor);
+      SetCursorInternal(cursor);
   } else {
     cursor_to_set_on_unlock_ = cursor;
     did_cursor_change_ = true;
@@ -59,4 +63,20 @@ bool CursorManager::IsCursorVisible() const {
   return cursor_visible_;
 }
 
+void CursorManager::SetDeviceScaleFactor(float device_scale_factor) {
+  if (image_cursors_->GetDeviceScaleFactor() == device_scale_factor)
+    return;
+  image_cursors_->SetDeviceScaleFactor(device_scale_factor);
+  SetCursorInternal(current_cursor_);
+}
+
+void CursorManager::SetCursorInternal(gfx::NativeCursor cursor) {
+  DCHECK(delegate_);
+  current_cursor_ = cursor;
+  image_cursors_->SetPlatformCursor(&current_cursor_);
+  current_cursor_.set_device_scale_factor(
+      image_cursors_->GetDeviceScaleFactor());
+  delegate_->SetCursor(current_cursor_);
+}
+
 }  // namespace ash
diff --git a/ash/wm/cursor_manager.h b/ash/wm/cursor_manager.h
index 9f2cc8b..f5b5548 100644
--- a/ash/wm/cursor_manager.h
+++ b/ash/wm/cursor_manager.h
@@ -7,12 +7,14 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace ash {
 class CursorDelegate;
+class ImageCursors;
 
 // This class controls the visibility and the type of the cursor.
 // The cursor type can be locked so that the type stays the same
@@ -33,11 +35,15 @@ class CursorManager : public aura::client::CursorClient {
   // Shows or hides the cursor.
   bool cursor_visible() const { return cursor_visible_; }
 
+  // Overridden from aura::client::CursorClient:
   virtual void SetCursor(gfx::NativeCursor) OVERRIDE;
   virtual void ShowCursor(bool show) OVERRIDE;
   virtual bool IsCursorVisible() const OVERRIDE;
+  virtual void SetDeviceScaleFactor(float device_scale_factor) OVERRIDE;
 
  private:
+  void SetCursorInternal(gfx::NativeCursor cursor);
+
   CursorDelegate* delegate_;
 
   // Number of times LockCursor() has been invoked without a corresponding
@@ -54,6 +60,11 @@ class CursorManager : public aura::client::CursorClient {
   // Is cursor visible?
   bool cursor_visible_;
 
+  // The cursor currently set.
+  gfx::NativeCursor current_cursor_;
+
+  scoped_ptr<ImageCursors> image_cursors_;
+
   DISALLOW_COPY_AND_ASSIGN(CursorManager);
 };
 
diff --git a/ash/wm/image_cursors.cc b/ash/wm/image_cursors.cc
new file mode 100644
index 0000000..b0ec3f5
--- /dev/null
+++ b/ash/wm/image_cursors.cc
@@ -0,0 +1,123 @@
+// 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 "ash/wm/image_cursors.h"
+
+#include "base/logging.h"
+#include "ui/base/cursor/cursor_loader.h"
+#include "ui/base/cursor/cursor.h"
+#include "ui/gfx/point.h"
+#include "grit/ui_resources.h"
+
+namespace {
+
+const int kAnimatedCursorFrameDelayMs = 25;
+
+struct HotPoint {
+  int x;
+  int y;
+};
+
+struct CursorData {
+  int id;
+  int resource_id;
+  HotPoint hot_1x;
+  HotPoint hot_2x;
+};
+
+// TODO(oshima): Remove this comment (http://crbug.com/141586).
+// The cursor's hot points are defined in chromeos cursor images at:
+// http://folder/kuscher/projects/Chrome_OS/Pointers/focuspoint
+const CursorData kImageCursors[] = {
+  {ui::kCursorNull, IDR_AURA_CURSOR_PTR, {4, 4}, {8, 9}},
+  {ui::kCursorPointer, IDR_AURA_CURSOR_PTR, {4, 4}, {8, 9}},
+  {ui::kCursorNoDrop, IDR_AURA_CURSOR_NO_DROP, {4, 4}, {8, 9}},
+  {ui::kCursorNotAllowed, IDR_AURA_CURSOR_NO_DROP, {4, 4}, {8, 9}},
+  {ui::kCursorCopy, IDR_AURA_CURSOR_COPY, {4, 4}, {8, 9}},
+  {ui::kCursorHand, IDR_AURA_CURSOR_HAND, {9, 4}, {19, 8}},
+  {ui::kCursorMove, IDR_AURA_CURSOR_MOVE, {11, 11}, {23, 23}},
+  {ui::kCursorNorthEastResize, IDR_AURA_CURSOR_NORTH_EAST_RESIZE,
+   {12, 11}, {25, 23}},
+  {ui::kCursorSouthWestResize, IDR_AURA_CURSOR_SOUTH_WEST_RESIZE,
+   {12, 11}, {25, 23}},
+  {ui::kCursorSouthEastResize, IDR_AURA_CURSOR_SOUTH_EAST_RESIZE,
+   {11, 11}, {24, 23}},
+  {ui::kCursorNorthWestResize, IDR_AURA_CURSOR_NORTH_WEST_RESIZE,
+   {11, 11}, {24, 23}},
+  {ui::kCursorNorthResize, IDR_AURA_CURSOR_NORTH_RESIZE, {11, 12}, {23, 23}},
+  {ui::kCursorSouthResize, IDR_AURA_CURSOR_SOUTH_RESIZE, {11, 12}, {23, 23}},
+  {ui::kCursorEastResize, IDR_AURA_CURSOR_EAST_RESIZE, {12, 11}, {25, 23}},
+  {ui::kCursorWestResize, IDR_AURA_CURSOR_WEST_RESIZE, {12, 11}, {25, 23}},
+  {ui::kCursorIBeam, IDR_AURA_CURSOR_IBEAM, {12, 12}, {24, 25}},
+  {ui::kCursorAlias, IDR_AURA_CURSOR_ALIAS, {8, 6}, {15, 11}},
+  {ui::kCursorCell, IDR_AURA_CURSOR_CELL, {11, 11}, {24, 23}},
+  {ui::kCursorContextMenu, IDR_AURA_CURSOR_CONTEXT_MENU, {4, 4}, {8, 9}},
+  {ui::kCursorCross, IDR_AURA_CURSOR_CROSSHAIR, {12, 12}, {25, 23}},
+  {ui::kCursorHelp, IDR_AURA_CURSOR_HELP, {4, 4}, {8, 9}},
+  {ui::kCursorVerticalText, IDR_AURA_CURSOR_XTERM_HORIZ, {12, 11}, {26, 23}},
+  {ui::kCursorZoomIn, IDR_AURA_CURSOR_ZOOM_IN, {10, 10}, {20, 20}},
+  {ui::kCursorZoomOut, IDR_AURA_CURSOR_ZOOM_OUT, {10, 10}, {20, 20}},
+  {ui::kCursorRowResize, IDR_AURA_CURSOR_ROW_RESIZE, {11, 12}, {23, 23}},
+  {ui::kCursorColumnResize, IDR_AURA_CURSOR_COL_RESIZE, {12, 11}, {25, 23}},
+  {ui::kCursorEastWestResize, IDR_AURA_CURSOR_EAST_WEST_RESIZE,
+   {12, 11}, {25, 23}},
+  {ui::kCursorNorthSouthResize, IDR_AURA_CURSOR_NORTH_SOUTH_RESIZE,
+   {11, 12}, {23, 23}},
+  {ui::kCursorNorthEastSouthWestResize,
+   IDR_AURA_CURSOR_NORTH_EAST_SOUTH_WEST_RESIZE, {12, 11}, {25, 23}},
+  {ui::kCursorNorthWestSouthEastResize,
+   IDR_AURA_CURSOR_NORTH_WEST_SOUTH_EAST_RESIZE, {11, 11}, {24, 23}},
+  {ui::kCursorGrab, IDR_AURA_CURSOR_GRAB, {8, 5}, {16, 10}},
+  {ui::kCursorGrabbing, IDR_AURA_CURSOR_GRABBING, {9, 9}, {18, 18}},
+};
+
+const CursorData kAnimatedCursors[] = {
+  {ui::kCursorWait, IDR_THROBBER, {7, 7}, {14, 14}},
+  {ui::kCursorProgress, IDR_THROBBER, {7, 7}, {14, 14}},
+};
+
+}  // namespace
+
+namespace ash {
+
+ImageCursors::ImageCursors()
+    : cursor_loader_(ui::CursorLoader::Create()) {
+}
+
+ImageCursors::~ImageCursors() {
+}
+
+float ImageCursors::GetDeviceScaleFactor() const {
+  return cursor_loader_->device_scale_factor();
+}
+
+void ImageCursors::SetDeviceScaleFactor(float device_scale_factor) {
+  if (GetDeviceScaleFactor() == device_scale_factor)
+    return;
+
+  cursor_loader_->UnloadAll();
+  cursor_loader_->set_device_scale_factor(device_scale_factor);
+
+  for (size_t i = 0; i < arraysize(kImageCursors); ++i) {
+    const HotPoint& hot = device_scale_factor == 1.0f ?
+        kImageCursors[i].hot_1x : kImageCursors[i].hot_2x;
+    cursor_loader_->LoadImageCursor(kImageCursors[i].id,
+                                    kImageCursors[i].resource_id,
+                                    gfx::Point(hot.x, hot.y));
+  }
+  for (size_t i = 0; i < arraysize(kAnimatedCursors); ++i) {
+    const HotPoint& hot = device_scale_factor == 1.0f ?
+        kAnimatedCursors[i].hot_1x : kAnimatedCursors[i].hot_2x;
+    cursor_loader_->LoadAnimatedCursor(kAnimatedCursors[i].id,
+                                       kAnimatedCursors[i].resource_id,
+                                       gfx::Point(hot.x, hot.y),
+                                       kAnimatedCursorFrameDelayMs);
+  }
+}
+
+void ImageCursors::SetPlatformCursor(gfx::NativeCursor* cursor) {
+  cursor_loader_->SetPlatformCursor(cursor);
+}
+
+}  // namespace ash
diff --git a/ash/wm/image_cursors.h b/ash/wm/image_cursors.h
new file mode 100644
index 0000000..a1a7c41
--- /dev/null
+++ b/ash/wm/image_cursors.h
@@ -0,0 +1,43 @@
+// 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.
+
+#ifndef ASH_WM_IMAGE_CURSORS_H_
+#define ASH_WM_IMAGE_CURSORS_H_
+
+#include "ash/ash_export.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace ui {
+class CursorLoader;
+}
+
+namespace ash {
+
+// A utility class that provides cursors for NativeCursors for which we have
+// image resources.
+class ASH_EXPORT ImageCursors {
+ public:
+  ImageCursors();
+  ~ImageCursors();
+
+  // Returns the device scale factor of cursors.
+  float GetDeviceScaleFactor() const;
+
+  // Sets the device scale factor of the cursors with |device_scale_factor| and
+  // reloads the cursor images if necessary.
+  void SetDeviceScaleFactor(float device_scale_factor);
+
+  // Sets the platform cursor based on the native type of |cursor|.
+  void SetPlatformCursor(gfx::NativeCursor* cursor);
+
+ private:
+  scoped_ptr<ui::CursorLoader> cursor_loader_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageCursors);
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_IMAGE_CURSORS_H_
diff --git a/ash/wm/toplevel_window_event_handler.cc b/ash/wm/toplevel_window_event_handler.cc
index aa0f754..ce4be53 100644
--- a/ash/wm/toplevel_window_event_handler.cc
+++ b/ash/wm/toplevel_window_event_handler.cc
@@ -14,6 +14,7 @@
 #include "base/message_loop.h"
 #include "base/run_loop.h"
 #include "ui/aura/client/aura_constants.h"
+#include "ui/aura/client/cursor_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -276,7 +277,10 @@ aura::client::WindowMoveResult ToplevelWindowEventHandler::RunMoveLoop(
         root_window, source->parent(), &drag_location);
   }
   CreateScopedWindowResizer(source, drag_location, HTCAPTION);
-  source->GetRootWindow()->SetCursor(ui::kCursorPointer);
+  aura::client::CursorClient* cursor_client =
+      aura::client::GetCursorClient(root_window);
+  if (cursor_client)
+    cursor_client->SetCursor(ui::kCursorPointer);
 #if !defined(OS_MACOSX)
   MessageLoopForUI* loop = MessageLoopForUI::current();
   MessageLoop::ScopedNestableTaskAllower allow_nested(loop);