Gets the drop arrow to show when dragging URLs over the tab strip....

chrome/browser/views/tabs/tab_strip.cc

 // Copyright (c) 2009 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/views/tabs/tab_strip.h"
 
 #include "app/drag_drop_types.h"
 #include "app/gfx/canvas.h"
 #include "app/gfx/path.h"
 #include "app/l10n_util.h"
 #include "app/os_exchange_data.h"
 #include "app/resource_bundle.h"
 #include "app/slide_animation.h"
-#if defined(OS_WIN)
-#include "app/win_util.h"
-#endif
 #include "base/gfx/size.h"
 #include "base/stl_util-inl.h"
 #include "chrome/browser/browser_theme_provider.h"
 #include "chrome/browser/metrics/user_metrics.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/browser/tabs/tab_strip_model.h"
 #include "chrome/browser/view_ids.h"
 #include "chrome/browser/views/tabs/dragged_tab_controller.h"
 #include "chrome/browser/views/tabs/tab.h"
 #include "chrome/common/pref_names.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "views/controls/image_view.h"
 #include "views/painter.h"
 #include "views/widget/default_theme_provider.h"
 #include "views/window/non_client_view.h"
 #include "views/window/window.h"
 
+#if defined(OS_WIN)
+#include "app/win_util.h"
+#include "views/widget/widget_win.h"
+#elif defined(OS_LINUX)
+#include "views/widget/widget_gtk.h"
+#endif
+
 #undef min
 #undef max
 
 #if defined(COMPILER_GCC)
 // Squash false positive signed overflow warning in GenerateStartAndEndWidths
 // when doing 'start_tab_count < end_tab_count'.
 #pragma GCC diagnostic ignored "-Wstrict-overflow"
 #endif
 
 using views::DropTargetEvent;
@@ skipping 1627 matching lines @@
   }
 
   // Reposition the window. Need to show it too as the window is initially
   // hidden.
 
 #if defined(OS_WIN)
   drop_info_->arrow_window->SetWindowPos(
       HWND_TOPMOST, drop_bounds.x(), drop_bounds.y(), drop_bounds.width(),
       drop_bounds.height(), SWP_NOACTIVATE | SWP_SHOWWINDOW);
 #else
-  NOTIMPLEMENTED();
+  drop_info_->arrow_window->SetBounds(drop_bounds);
+  drop_info_->arrow_window->Show();
 #endif
 }
 
 int TabStrip::GetDropEffect(const views::DropTargetEvent& event) {
   const int source_ops = event.GetSourceOperations();
   if (source_ops & DragDropTypes::DRAG_COPY)
     return DragDropTypes::DRAG_COPY;
   if (source_ops & DragDropTypes::DRAG_LINK)
     return DragDropTypes::DRAG_LINK;
   return DragDropTypes::DRAG_MOVE;
 }
 
 // static
 SkBitmap* TabStrip::GetDropArrowImage(bool is_down) {
   return ResourceBundle::GetSharedInstance().GetBitmapNamed(
       is_down ? IDR_TAB_DROP_DOWN : IDR_TAB_DROP_UP);
 }
 
 // TabStrip::DropInfo ----------------------------------------------------------
 
 TabStrip::DropInfo::DropInfo(int drop_index, bool drop_before, bool point_down)
     : drop_index(drop_index),
       drop_before(drop_before),
       point_down(point_down) {
+  arrow_view = new views::ImageView;
+  arrow_view->SetImage(GetDropArrowImage(point_down));
+
 #if defined(OS_WIN)
   arrow_window = new views::WidgetWin;
+  arrow_window->Init(
+      NULL,
+      gfx::Rect(0, 0, drop_indicator_width, drop_indicator_height));
   arrow_window->set_window_style(WS_POPUP);
   arrow_window->set_window_ex_style(WS_EX_TOPMOST | WS_EX_NOACTIVATE |
                                     WS_EX_LAYERED | WS_EX_TRANSPARENT);
-
-  arrow_view = new views::ImageView;
-  arrow_view->SetImage(GetDropArrowImage(point_down));
-
+#else
+  arrow_window = new views::WidgetGtk(views::WidgetGtk::TYPE_POPUP);
+  arrow_window->MakeTransparent();
   arrow_window->Init(
       NULL,
       gfx::Rect(0, 0, drop_indicator_width, drop_indicator_height));
+#endif
   arrow_window->SetContentsView(arrow_view);
-#else
-  NOTIMPLEMENTED();
-#endif
 }
 
 TabStrip::DropInfo::~DropInfo() {
   // Close eventually deletes the window, which deletes arrow_view too.
-#if defined(OS_WIN)
   arrow_window->Close();
-#endif
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 // Called from:
 // - BasicLayout
 // - Tab insertion/removal
 // - Tab reorder
 void TabStrip::GenerateIdealBounds() {
   int tab_count = GetTabCount();
@@ skipping 201 matching lines @@
               &TabStrip::ResizeLayoutTabs),
           kResizeTabsTimeMs);
     }
   } else {
     // Mouse moved quickly out of the tab strip and then into it again, so
     // cancel the timer so that the strip doesn't move when the mouse moves
     // back over it.
     resize_layout_factory_.RevokeAll();
   }
 }