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 "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/geometry/vector2d.h"
  14 #include "ui/gfx/image/image.h"
  15 #include "ui/resources/grit/ui_resources.h"
  16 #include "ui/views/controls/button/label_button.h"
  17 #include "ui/views/drag_utils.h"
  18 #include "ui/views/widget/widget.h"
  19 #include "url/gurl.h"
  20
  21 namespace button_drag_utils {
  22
  23 // Maximum width of the link drag image in pixels.
  24 static const int kLinkDragImageMaxWidth = 150;
  25
  26 void SetURLAndDragImage(const GURL& url,
  27                         const base::string16& title,
  28                         const gfx::ImageSkia& icon,
  29                         const gfx::Point* press_pt,
  30                         ui::OSExchangeData* data,
  31                         views::Widget* widget) {
  32   DCHECK(url.is_valid() && data);
  33   data->SetURL(url, title);
  34   SetDragImage(url, title, icon, press_pt, data, widget);
  35 }
  36
  37 void SetDragImage(const GURL& url,
  38                   const base::string16& title,
  39                   const gfx::ImageSkia& icon,
  40                   const gfx::Point* press_pt,
  41                   ui::OSExchangeData* data,
  42                   views::Widget* widget) {
  43   // Create a button to render the drag image for us.
  44   views::LabelButton button(NULL,
  45                             title.empty() ? base::UTF8ToUTF16(url.spec())
  46                                           : title);
  47   button.SetTextSubpixelRenderingEnabled(false);
  48   const ui::NativeTheme* theme =
  49       widget ? widget->GetNativeTheme() : ui::NativeTheme::instance();
  50   button.SetTextColor(views::Button::STATE_NORMAL,
  51       theme->GetSystemColor(ui::NativeTheme::kColorId_LabelEnabledColor));
  52   gfx::ShadowValues shadows(
  53       10,
  54       gfx::ShadowValue(gfx::Vector2d(0, 0), 1.0f,
  55                        theme->GetSystemColor(
  56                            ui::NativeTheme::kColorId_LabelBackgroundColor)));
  57   button.SetTextShadows(shadows);
  58   button.SetMaxSize(gfx::Size(kLinkDragImageMaxWidth, 0));
  59   if (icon.isNull()) {
  60     button.SetImage(views::Button::STATE_NORMAL,
  61                     *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
  62                         IDR_DEFAULT_FAVICON).ToImageSkia());
  63   } else {
  64     button.SetImage(views::Button::STATE_NORMAL, icon);
  65   }
  66   gfx::Size prefsize = button.GetPreferredSize();
  67   button.SetBounds(0, 0, prefsize.width(), prefsize.height());
  68
  69   gfx::Vector2d press_point;
  70   if (press_pt)
  71     press_point = press_pt->OffsetFromOrigin();
  72   else
  73     press_point = gfx::Vector2d(prefsize.width() / 2, prefsize.height() / 2);
  74
  75   // Render the image.
  76   scoped_ptr<gfx::Canvas> canvas(
  77       views::GetCanvasForDragImage(widget, prefsize));
  78   button.Paint(canvas.get(), views::CullSet());
  79   drag_utils::SetDragImageOnDataObject(*canvas, press_point, data);
  80 }
  81
  82 }  // namespace button_drag_utils