ui/views/button_drag_utils.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/views/button_drag_utils.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "grit/ui_resources.h"
   9 #include "ui/base/dragdrop/drag_utils.h"
  10 #include "ui/base/dragdrop/os_exchange_data.h"
  11 #include "ui/base/resource/resource_bundle.h"
  12 #include "ui/gfx/canvas.h"
  13 #include "ui/gfx/image/image.h"
  14 #include "ui/views/controls/button/text_button.h"
  15 #include "ui/views/drag_utils.h"
  16 #include "url/gurl.h"
  17
  18 namespace button_drag_utils {
  19
  20 // Maximum width of the link drag image in pixels.
  21 static const int kLinkDragImageMaxWidth = 200;
  22
  23 void SetURLAndDragImage(const GURL& url,
  24                         const base::string16& title,
  25                         const gfx::ImageSkia& icon,
  26                         ui::OSExchangeData* data,
  27                         views::Widget* widget) {
  28   DCHECK(url.is_valid() && data);
  29
  30   data->SetURL(url, title);
  31
  32   // Create a button to render the drag image for us.
  33   views::TextButton button(NULL,
  34                            title.empty() ? base::UTF8ToUTF16(url.spec())
  35                                          : title);
  36   button.set_max_width(kLinkDragImageMaxWidth);
  37   if (icon.isNull()) {
  38     button.SetIcon(*ui::ResourceBundle::GetSharedInstance().GetImageNamed(
  39                    IDR_DEFAULT_FAVICON).ToImageSkia());
  40   } else {
  41     button.SetIcon(icon);
  42   }
  43   gfx::Size prefsize = button.GetPreferredSize();
  44   button.SetBounds(0, 0, prefsize.width(), prefsize.height());
  45
  46   // Render the image.
  47   scoped_ptr<gfx::Canvas> canvas(
  48       views::GetCanvasForDragImage(widget, prefsize));
  49   button.PaintButton(canvas.get(), views::TextButton::PB_FOR_DRAG);
  50   drag_utils::SetDragImageOnDataObject(*canvas, prefsize,
  51       gfx::Vector2d(prefsize.width() / 2, prefsize.height() / 2), data);
  52 }
  53
  54 }  // namespace button_drag_utils