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      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
     79