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/canvas_painter.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/resources/grit/views_resources.h"
  20 #include "ui/views/widget/widget.h"
  21 #include "url/gurl.h"
  22
  23 namespace button_drag_utils {
  24
  25 // Maximum width of the link drag image in pixels.
  26 static const int kLinkDragImageMaxWidth = 150;
  27
  28 void SetURLAndDragImage(const GURL& url,
  29                         const base::string16& title,
  30                         const gfx::ImageSkia& icon,
  31                         const gfx::Point* press_pt,
  32                         ui::OSExchangeData* data,
  33                         views::Widget* widget) {
  34   DCHECK(url.is_valid() && data);
  35   data->SetURL(url, title);
  36   SetDragImage(url, title, icon, press_pt, data, widget);
  37 }
  38
  39 void SetDragImage(const GURL& url,
  40                   const base::string16& title,
  41                   const gfx::ImageSkia& icon,
  42                   const gfx::Point* press_pt,
  43                   ui::OSExchangeData* data,
  44                   views::Widget* widget) {
  45   // Create a button to render the drag image for us.
  46   views::LabelButton button(NULL,
  47                             title.empty() ? base::UTF8ToUTF16(url.spec())
  48                                           : title);
  49   button.SetTextSubpixelRenderingEnabled(false);
  50   const ui::NativeTheme* theme =
  51       widget ? widget->GetNativeTheme() : ui::NativeTheme::instance();
  52   button.SetTextColor(views::Button::STATE_NORMAL,
  53       theme->GetSystemColor(ui::NativeTheme::kColorId_LabelEnabledColor));
  54   gfx::ShadowValues shadows(
  55       10,
  56       gfx::ShadowValue(gfx::Vector2d(0, 0), 1.0f,
  57                        theme->GetSystemColor(
  58                            ui::NativeTheme::kColorId_LabelBackgroundColor)));
  59   button.SetTextShadows(shadows);
  60   button.SetMaxSize(gfx::Size(kLinkDragImageMaxWidth, 0));
  61   if (icon.isNull()) {
  62     button.SetImage(views::Button::STATE_NORMAL,
  63                     *ui::ResourceBundle::GetSharedInstance().GetImageNamed(
  64                         IDR_DEFAULT_FAVICON).ToImageSkia());
  65   } else {
  66     button.SetImage(views::Button::STATE_NORMAL, icon);
  67   }
  68   gfx::Size prefsize = button.GetPreferredSize();
  69   button.SetBounds(0, 0, prefsize.width(), prefsize.height());
  70
  71   gfx::Vector2d press_point;
  72   if (press_pt)
  73     press_point = press_pt->OffsetFromOrigin();
  74   else
  75     press_point = gfx::Vector2d(prefsize.width() / 2, prefsize.height() / 2);
  76
  77   // Render the image.
  78   scoped_ptr<gfx::Canvas> canvas(
  79       views::GetCanvasForDragImage(widget, prefsize));
  80   button.Paint(ui::CanvasPainter(canvas.get(), 1.f).context());
  81   drag_utils::SetDragImageOnDataObject(*canvas, press_point, data);
  82 }
  83
  84 }  // namespace button_drag_utils