button_drag_utils.cc 4.9 KB

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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. #include "ui/views/button_drag_utils.h"
  5. #include <memory>
  6. #include <utility>
  7. #include "base/memory/raw_ptr.h"
  8. #include "base/strings/utf_string_conversions.h"
  9. #include "ui/base/dragdrop/os_exchange_data.h"
  10. #include "ui/base/models/image_model.h"
  11. #include "ui/base/resource/resource_bundle.h"
  12. #include "ui/color/color_id.h"
  13. #include "ui/color/color_provider.h"
  14. #include "ui/compositor/canvas_painter.h"
  15. #include "ui/compositor/compositor.h"
  16. #include "ui/gfx/canvas.h"
  17. #include "ui/gfx/geometry/point.h"
  18. #include "ui/gfx/geometry/vector2d.h"
  19. #include "ui/gfx/image/image.h"
  20. #include "ui/resources/grit/ui_resources.h"
  21. #include "ui/views/background.h"
  22. #include "ui/views/border.h"
  23. #include "ui/views/controls/button/label_button.h"
  24. #include "ui/views/controls/button/label_button_border.h"
  25. #include "ui/views/drag_utils.h"
  26. #include "ui/views/paint_info.h"
  27. #include "ui/views/widget/widget.h"
  28. #include "url/gurl.h"
  29. namespace button_drag_utils {
  30. // Maximum width of the link drag image in pixels.
  31. static constexpr int kLinkDragImageMaxWidth = 150;
  32. class ScopedWidget {
  33. public:
  34. explicit ScopedWidget(views::Widget* widget) : widget_(widget) {}
  35. ScopedWidget(const ScopedWidget&) = delete;
  36. ScopedWidget& operator=(const ScopedWidget&) = delete;
  37. ~ScopedWidget() {
  38. if (widget_)
  39. widget_->CloseNow();
  40. }
  41. views::Widget* operator->() const { return widget_; }
  42. views::Widget* get() const { return widget_; }
  43. private:
  44. raw_ptr<views::Widget> widget_;
  45. };
  46. void SetURLAndDragImage(const GURL& url,
  47. const std::u16string& title,
  48. const gfx::ImageSkia& icon,
  49. const gfx::Point* press_pt,
  50. ui::OSExchangeData* data) {
  51. DCHECK(url.is_valid());
  52. DCHECK(data);
  53. data->SetURL(url, title);
  54. SetDragImage(url, title, icon, press_pt, data);
  55. }
  56. void SetDragImage(const GURL& url,
  57. const std::u16string& title,
  58. const gfx::ImageSkia& icon,
  59. const gfx::Point* press_pt,
  60. ui::OSExchangeData* data) {
  61. // Create a widget to render the drag image for us.
  62. ScopedWidget drag_widget(new views::Widget());
  63. views::Widget::InitParams params(views::Widget::InitParams::TYPE_DRAG);
  64. params.accept_events = false;
  65. params.ownership = views::Widget::InitParams::NATIVE_WIDGET_OWNS_WIDGET;
  66. params.shadow_type = views::Widget::InitParams::ShadowType::kNone;
  67. params.opacity = views::Widget::InitParams::WindowOpacity::kTranslucent;
  68. drag_widget->Init(std::move(params));
  69. // Create a button to render the drag image for us.
  70. views::LabelButton* button =
  71. drag_widget->SetContentsView(std::make_unique<views::LabelButton>(
  72. views::Button::PressedCallback(),
  73. title.empty() ? base::UTF8ToUTF16(url.spec()) : title));
  74. button->SetTextSubpixelRenderingEnabled(false);
  75. const ui::ColorProvider* color_provider = drag_widget->GetColorProvider();
  76. button->SetTextColor(views::Button::STATE_NORMAL,
  77. color_provider->GetColor(ui::kColorTextfieldForeground));
  78. SkColor bg_color = color_provider->GetColor(ui::kColorTextfieldBackground);
  79. if (drag_widget->IsTranslucentWindowOpacitySupported()) {
  80. button->SetTextShadows(gfx::ShadowValues(
  81. 10, gfx::ShadowValue(gfx::Vector2d(0, 0), 2.0f, bg_color)));
  82. } else {
  83. button->SetBackground(views::CreateSolidBackground(bg_color));
  84. button->SetBorder(button->CreateDefaultBorder());
  85. }
  86. button->SetMaxSize(gfx::Size(kLinkDragImageMaxWidth, 0));
  87. if (icon.isNull()) {
  88. button->SetImageModel(views::Button::STATE_NORMAL,
  89. ui::ImageModel::FromResourceId(IDR_DEFAULT_FAVICON));
  90. } else {
  91. button->SetImageModel(views::Button::STATE_NORMAL,
  92. ui::ImageModel::FromImageSkia(icon));
  93. }
  94. gfx::Size size(button->GetPreferredSize());
  95. // drag_widget's size must be set to show the drag image in RTL.
  96. // However, on Windows, calling Widget::SetSize() resets
  97. // the LabelButton's bounds via OnNativeWidgetSizeChanged().
  98. // Therefore, call button->SetBoundsRect() after drag_widget->SetSize().
  99. drag_widget->SetSize(size);
  100. button->SetBoundsRect(gfx::Rect(size));
  101. gfx::Vector2d press_point;
  102. if (press_pt)
  103. press_point = press_pt->OffsetFromOrigin();
  104. else
  105. press_point = gfx::Vector2d(size.width() / 2, size.height() / 2);
  106. SkBitmap bitmap;
  107. float raster_scale = ScaleFactorForDragFromWidget(drag_widget.get());
  108. SkColor color = SK_ColorTRANSPARENT;
  109. button->Paint(views::PaintInfo::CreateRootPaintInfo(
  110. ui::CanvasPainter(&bitmap, size, raster_scale, color,
  111. true /* is_pixel_canvas */)
  112. .context(),
  113. size));
  114. gfx::ImageSkia image = gfx::ImageSkia::CreateFromBitmap(bitmap, raster_scale);
  115. data->provider().SetDragImage(image, press_point);
  116. }
  117. } // namespace button_drag_utils