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