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/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
  20 namespace button_drag_utils {
  21
  22 // Maximum width of the link drag image in pixels.
  23 static const int kLinkDragImageMaxWidth = 150;
  24
  25 void 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
  36 void 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