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 "ui/base/dragdrop/drag_utils.h"
9#include "ui/base/dragdrop/os_exchange_data.h"
10#include "ui/base/resource/resource_bundle.h"
11#include "ui/gfx/canvas.h"
12#include "ui/gfx/geometry/point.h"
13#include "ui/gfx/image/image.h"
14#include "ui/resources/grit/ui_resources.h"
15#include "ui/views/controls/button/label_button.h"
16#include "ui/views/drag_utils.h"
17#include "ui/views/widget/widget.h"
18#include "url/gurl.h"
19
20namespace button_drag_utils {
21
22// Maximum width of the link drag image in pixels.
23static const int kLinkDragImageMaxWidth = 150;
24
25void SetURLAndDragImage(const GURL& url,
26                        const base::string16& title,
27                        const gfx::ImageSkia& icon,
28                        const gfx::Point* press_pt,
29                        ui::OSExchangeData* data,
30                        views::Widget* widget) {
31  DCHECK(url.is_valid() && data);
32  data->SetURL(url, title);
33  SetDragImage(url, title, icon, press_pt, data, widget);
34}
35
36void SetDragImage(const GURL& url,
37                  const base::string16& title,
38                  const gfx::ImageSkia& icon,
39                  const gfx::Point* press_pt,
40                  ui::OSExchangeData* data,
41                  views::Widget* widget) {
42  // Create a button to render the drag image for us.
43  views::LabelButton button(NULL,
44                            title.empty() ? base::UTF8ToUTF16(url.spec())
45                                          : title);
46  button.SetTextSubpixelRenderingEnabled(false);
47  const ui::NativeTheme* theme =
48      widget ? widget->GetNativeTheme() : ui::NativeTheme::instance();
49  button.SetTextColor(views::Button::STATE_NORMAL,
50      theme->GetSystemColor(ui::NativeTheme::kColorId_LabelEnabledColor));
51  gfx::ShadowValues shadows(10, gfx::ShadowValue(gfx::Point(0,0), 1.0f,
52      theme->GetSystemColor(ui::NativeTheme::kColorId_LabelBackgroundColor)));
53  button.SetTextShadows(shadows);
54  button.SetMaxSize(gfx::Size(kLinkDragImageMaxWidth, 0));
55  if (icon.isNull()) {
56    button.SetImage(views::Button::STATE_NORMAL,
57                    *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
58                        IDR_DEFAULT_FAVICON).ToImageSkia());
59  } else {
60    button.SetImage(views::Button::STATE_NORMAL, icon);
61  }
62  gfx::Size prefsize = button.GetPreferredSize();
63  button.SetBounds(0, 0, prefsize.width(), prefsize.height());
64
65  gfx::Vector2d press_point;
66  if (press_pt)
67    press_point = press_pt->OffsetFromOrigin();
68  else
69    press_point = gfx::Vector2d(prefsize.width() / 2, prefsize.height() / 2);
70
71  // Render the image.
72  scoped_ptr<gfx::Canvas> canvas(
73      views::GetCanvasForDragImage(widget, prefsize));
74  button.Paint(canvas.get(), views::CullSet());
75  drag_utils::SetDragImageOnDataObject(*canvas, press_point, data);
76}
77
78}  // namespace button_drag_utils
79