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/geometry/point.h"
14 #include "ui/gfx/image/image.h"
15 #include "ui/views/controls/button/text_button.h"
16 #include "ui/views/drag_utils.h"
17 #include "url/gurl.h"
18
19 namespace button_drag_utils {
20
21 // Maximum width of the link drag image in pixels.
22 static const int kLinkDragImageMaxWidth = 150;
23
SetURLAndDragImage(const GURL & url,const base::string16 & title,const gfx::ImageSkia & icon,const gfx::Point * press_pt,ui::OSExchangeData * data,views::Widget * widget)24 void SetURLAndDragImage(const GURL& url,
25 const base::string16& title,
26 const gfx::ImageSkia& icon,
27 const gfx::Point* press_pt,
28 ui::OSExchangeData* data,
29 views::Widget* widget) {
30 DCHECK(url.is_valid() && data);
31 data->SetURL(url, title);
32 SetDragImage(url, title, icon, press_pt, data, widget);
33 }
34
SetDragImage(const GURL & url,const base::string16 & title,const gfx::ImageSkia & icon,const gfx::Point * press_pt,ui::OSExchangeData * data,views::Widget * widget)35 void SetDragImage(const GURL& url,
36 const base::string16& title,
37 const gfx::ImageSkia& icon,
38 const gfx::Point* press_pt,
39 ui::OSExchangeData* data,
40 views::Widget* widget) {
41 // Create a button to render the drag image for us.
42 views::TextButton button(NULL,
43 title.empty() ? base::UTF8ToUTF16(url.spec())
44 : title);
45 button.set_max_width(kLinkDragImageMaxWidth);
46 if (icon.isNull()) {
47 button.SetIcon(*ui::ResourceBundle::GetSharedInstance().GetImageNamed(
48 IDR_DEFAULT_FAVICON).ToImageSkia());
49 } else {
50 button.SetIcon(icon);
51 }
52 gfx::Size prefsize = button.GetPreferredSize();
53 button.SetBounds(0, 0, prefsize.width(), prefsize.height());
54
55 gfx::Vector2d press_point;
56 if (press_pt)
57 press_point = press_pt->OffsetFromOrigin();
58 else
59 press_point = gfx::Vector2d(prefsize.width() / 2, prefsize.height() / 2);
60
61 // Render the image.
62 scoped_ptr<gfx::Canvas> canvas(
63 views::GetCanvasForDragImage(widget, prefsize));
64 button.PaintButton(canvas.get(), views::TextButton::PB_FOR_DRAG);
65 drag_utils::SetDragImageOnDataObject(*canvas, press_point, data);
66 }
67
68 } // namespace button_drag_utils
69