SetCapture of mouse events in partial screenshot. Mouse events are routed to the capture window. I…

ash/wm/partial_screenshot_view.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 "ash/wm/partial_screenshot_view.h"
 
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/partial_screenshot_event_filter.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
+#include "ui/base/events.h"
 #include "ui/base/cursor/cursor.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 PartialScreenshotView::PartialScreenshotView(
     ScreenshotDelegate* screenshot_delegate)
@@ skipping 26 matching lines @@
   // the screen.
   params.parent = Shell::GetInstance()->GetContainer(
       internal::kShellWindowId_OverlayContainer);
 
   widget->Init(params);
   widget->SetContentsView(view);
   widget->SetBounds(Shell::GetRootWindow()->bounds());
   widget->GetNativeView()->SetName("PartialScreenshotView");
   widget->StackAtTop();
   widget->Show();
+  // Captures mouse events in case that context menu already captures the
+  // events.  This will close the context menu.
+  // TODO(mukai): introduce stacking mechanism to capture window to

[sky, 2012/04/12 15:30:45]

To have menus stay on screen in this scenario will lead to all sorts of
problems. Best to close the menu like you have.

[Jun Mukai, 2012/04/13 06:11:28]

Then, removed the TODO.

+  // prevent closing menus.
+  widget->GetNativeView()->SetCapture(ui::CW_LOCK_MOUSE | ui::CW_LOCK_TOUCH);
 
   view->set_window(widget->GetNativeWindow());
   Shell::GetInstance()->partial_screenshot_filter()->Activate(view);
 }
 
 void PartialScreenshotView::Cancel() {
   DCHECK(window_);
   window_->Hide();
   Shell::GetInstance()->partial_screenshot_filter()->Deactivate();
   MessageLoop::current()->DeleteSoon(FROM_HERE, window_);
 }
 
 gfx::NativeCursor PartialScreenshotView::GetCursor(
     const views::MouseEvent& event) {
   // Always use "crosshair" cursor.
   return ui::kCursorCross;
 }
 
 void PartialScreenshotView::OnPaint(gfx::Canvas* canvas) {
   if (is_dragging_) {
     // Screenshot area representation: black rectangle with white
     // rectangle inside.
     gfx::Rect screenshot_rect = GetScreenshotRect();
     canvas->DrawRect(screenshot_rect, SK_ColorBLACK);
     screenshot_rect.Inset(1, 1, 1, 1);
     canvas->DrawRect(screenshot_rect, SK_ColorWHITE);
   }
 }
 
+void PartialScreenshotView::OnMouseCaptureLost() {
+  Cancel();
+}
+
 bool PartialScreenshotView::OnMousePressed(const views::MouseEvent& event) {
   start_position_ = event.location();
   return true;
 }
 
 bool PartialScreenshotView::OnMouseDragged(const views::MouseEvent& event) {
   current_position_ = event.location();
   SchedulePaint();
   is_dragging_ = true;
   return true;
@@ skipping 19 matching lines @@
 
 gfx::Rect PartialScreenshotView::GetScreenshotRect() const {
   int left = std::min(start_position_.x(), current_position_.x());
   int top = std::min(start_position_.y(), current_position_.y());
   int width = ::abs(start_position_.x() - current_position_.x());
   int height = ::abs(start_position_.y() - current_position_.y());
   return gfx::Rect(left, top, width, height);
 }
 
 }  // namespace ash