Don't allow new windows to be created outside the monitor's work area....

chrome/browser/ui/views/tabs/dragged_tab_controller.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/views/tabs/dragged_tab_controller.h"
 
 #include <math.h>
 #include <set>
 
 #include "base/callback.h"
@@ skipping 16 matching lines @@
 #include "chrome/common/notification_details.h"
 #include "chrome/common/notification_source.h"
 #include "gfx/canvas_skia.h"
 #include "grit/theme_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/animation/animation.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/slide_animation.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "views/event.h"
+#include "views/screen.h"
 #include "views/widget/root_view.h"
 #include "views/widget/widget.h"
 #include "views/window/window.h"
 
 #if defined(OS_WIN)
 #include "views/widget/widget_win.h"
 #endif
 
 #if defined(OS_LINUX)
 #include <gdk/gdk.h>  // NOLINT
@@ skipping 483 matching lines @@
   window_create_point_.Offset(mouse_offset_.x(), mouse_offset_.y());
 }
 
 gfx::Point DraggedTabController::GetWindowCreatePoint() const {
   gfx::Point cursor_point = GetCursorScreenPoint();
   if (dock_info_.type() != DockInfo::NONE && dock_info_.in_enable_area()) {
     // If we're going to dock, we need to return the exact coordinate,
     // otherwise we may attempt to maximize on the wrong monitor.
     return cursor_point;
   }
+  // If the cursor is outside the monitor area, move it inside. For example,
+  // dropping a tab onto the task bar on Windows produces this situation.
+  gfx::Rect work_area = views::Screen::GetMonitorWorkAreaNearestPoint(
+      cursor_point);
+  if (!work_area.IsEmpty()) {
+    if (cursor_point.x() < work_area.x())
+      cursor_point.set_x(work_area.x());
+    else if (cursor_point.x() > work_area.right())
+      cursor_point.set_x(work_area.right());
+    if (cursor_point.y() < work_area.y())
+      cursor_point.set_y(work_area.y());
+    else if (cursor_point.y() > work_area.bottom())
+      cursor_point.set_y(work_area.bottom());
+  }
   return gfx::Point(cursor_point.x() - window_create_point_.x(),
                     cursor_point.y() - window_create_point_.y());
 }
 
 void DraggedTabController::UpdateDockInfo(const gfx::Point& screen_point) {
   // Update the DockInfo for the current mouse coordinates.
   DockInfo dock_info = GetDockInfoAtPoint(screen_point);
   if (source_tabstrip_->type() == BaseTabStrip::VERTICAL_TAB_STRIP &&
       ((dock_info.type() == DockInfo::LEFT_OF_WINDOW &&
         !base::i18n::IsRTL()) ||
@@ skipping 786 matching lines @@
 #else
     NOTIMPLEMENTED();
 #endif
   }
 }
 
 TabStripModel* DraggedTabController::GetModel(BaseTabStrip* tabstrip) const {
   return static_cast<BrowserTabStripController*>(tabstrip->controller())->
       model();
 }