MacViews: Implement Tab Dragging

ui/views/cocoa/bridged_native_widget.mm

 // 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.
 
 #import "ui/views/cocoa/bridged_native_widget.h"
 
 #import <objc/runtime.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
 #import "ui/base/cocoa/constrained_window/constrained_window_animation.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/ime/input_method.h"
 #include "ui/base/ime/input_method_factory.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/dip_util.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 #import "ui/gfx/mac/nswindow_frame_controls.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/cocoa_mouse_capture.h"
+#import "ui/views/cocoa/cocoa_window_move_loop.h"
 #include "ui/views/cocoa/tooltip_manager_mac.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 #import "ui/views/cocoa/widget_owner_nswindow_adapter.h"
 #include "ui/views/view.h"
 #include "ui/views/views_delegate.h"
 #include "ui/views/widget/native_widget_mac.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_aura_utils.h"
 #include "ui/views/widget/widget_delegate.h"
 
@@ skipping 570 matching lines @@
 }
 
 void BridgedNativeWidget::ReleaseCapture() {
   mouse_capture_.reset();
 }
 
 bool BridgedNativeWidget::HasCapture() {
   return mouse_capture_ && mouse_capture_->IsActive();
 }
 
+Widget::MoveLoopResult BridgedNativeWidget::RunMoveLoop(
+      const gfx::Vector2d& drag_offset) {
+  DCHECK(!HasCapture());
+  DCHECK(!window_move_loop_);
+
+  // RunMoveLoop caller is responsible for updating the window to be under the
+  // mouse, but it does this using possibly outdated coordinate from the mouse
+  // event, and mouse is very likely moved beyound that point.
+
+  // Compensate for mouse drift by shifting the initial mouse position we pass
+  // to CocoaWindowMoveLoop, so as it handles incoming move events the window's
+  // top left corner will be |drag_offset| from the current mouse position.
+
+  const gfx::Rect frame = gfx::ScreenRectFromNSRect([window_ frame]);
+  const gfx::Point mouse_in_screen(frame.x() + drag_offset.x(),
+                                   frame.y() + drag_offset.y());
+  window_move_loop_.reset(new CocoaWindowMoveLoop(
+      this, gfx::ScreenPointToNSPoint(mouse_in_screen)));
+
+  return window_move_loop_->Run();
+
+  // |this| may be destroyed during the RunLoop, causing it to exit early.
+  // Even if that doesn't happen, CocoaWindowMoveLoop will clean itself up by
+  // calling EndMoveLoop(). So window_move_loop_ will always be null before the
+  // function returns. But don't DCHECK since |this| might not be valid.
+}
+
+void BridgedNativeWidget::EndMoveLoop() {
+  DCHECK(window_move_loop_);
+  window_move_loop_->End();
+  window_move_loop_.reset();
+}
+
 void BridgedNativeWidget::SetNativeWindowProperty(const char* name,
                                                   void* value) {
   NSString* key = [NSString stringWithUTF8String:name];
   if (value) {
     [GetWindowProperties() setObject:[NSValue valueWithPointer:value]
                               forKey:key];
   } else {
     [GetWindowProperties() removeObjectForKey:key];
   }
 }
@@ skipping 98 matching lines @@
 
   // 10.9 is unable to generate a window shadow from the composited CALayer, so
   // use Quartz.
   // We don't update the window mask during a live resize, instead it is done
   // after the resize is completed in viewDidEndLiveResize: in
   // BridgedContentView.
   if (base::mac::IsOSMavericksOrEarlier() && ![window_ inLiveResize])
     [bridged_view_ updateWindowMask];
 }
 
+void BridgedNativeWidget::OnPositionChanged() {
+  native_widget_mac_->GetWidget()->OnNativeWidgetMove();
+}
+
 void BridgedNativeWidget::OnVisibilityChanged() {
   OnVisibilityChangedTo([window_ isVisible]);
 }
 
 void BridgedNativeWidget::OnVisibilityChangedTo(bool new_visibility) {
   if (window_visible_ == new_visibility)
     return;
 
   window_visible_ = new_visibility;
 
@@ skipping 557 matching lines @@
   [bridged_view_ setMouseDownCanMoveWindow:draggable];
   // AppKit will not update its cache of mouseDownCanMoveWindow unless something
   // changes. Previously we tried adding an NSView and removing it, but for some
   // reason it required reposting the mouse-down event, and didn't always work.
   // Calling the below seems to be an effective solution.
   [window_ setMovableByWindowBackground:NO];
   [window_ setMovableByWindowBackground:YES];
 }
 
 }  // namespace views