TabWidget.h 4.6 KB

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  1. /*
  2. * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
  3. * Copyright (c) 2022, the SerenityOS developers.
  4. *
  5. * SPDX-License-Identifier: BSD-2-Clause
  6. */
  7. #pragma once
  8. #include <LibGUI/Margins.h>
  9. #include <LibGUI/Widget.h>
  10. namespace GUI {
  11. class TabWidget : public Widget {
  12. C_OBJECT(TabWidget)
  13. public:
  14. enum TabPosition {
  15. Top,
  16. Bottom,
  17. };
  18. virtual ~TabWidget() override = default;
  19. TabPosition tab_position() const { return m_tab_position; }
  20. void set_tab_position(TabPosition);
  21. Optional<size_t> active_tab_index() const;
  22. Widget* active_widget() { return m_active_widget.ptr(); }
  23. Widget const* active_widget() const { return m_active_widget.ptr(); }
  24. void set_active_widget(Widget*);
  25. void set_tab_index(int);
  26. int bar_height() const { return m_bar_visible ? 21 : 0; }
  27. GUI::Margins const& container_margins() const { return m_container_margins; }
  28. void set_container_margins(GUI::Margins const&);
  29. ErrorOr<void> try_add_widget(Widget&);
  30. void add_widget(Widget&);
  31. void remove_widget(Widget&);
  32. template<class T, class... Args>
  33. ErrorOr<NonnullRefPtr<T>> try_add_tab(String title, Args&&... args)
  34. {
  35. auto t = TRY(T::try_create(forward<Args>(args)...));
  36. t->set_title(move(title));
  37. TRY(try_add_widget(*t));
  38. return *t;
  39. }
  40. template<class T, class... Args>
  41. T& add_tab(String title, Args&&... args)
  42. {
  43. auto t = T::construct(forward<Args>(args)...);
  44. t->set_title(move(title));
  45. add_widget(*t);
  46. return *t;
  47. }
  48. void remove_tab(Widget& tab) { remove_widget(tab); }
  49. void remove_all_tabs_except(Widget& tab);
  50. void set_tab_title(Widget& tab, StringView title);
  51. void set_tab_icon(Widget& tab, Gfx::Bitmap const*);
  52. void activate_next_tab();
  53. void activate_previous_tab();
  54. void activate_last_tab();
  55. void set_text_alignment(Gfx::TextAlignment alignment) { m_text_alignment = alignment; }
  56. Gfx::TextAlignment text_alignment() const { return m_text_alignment; }
  57. bool uniform_tabs() const { return m_uniform_tabs; }
  58. void set_uniform_tabs(bool uniform_tabs) { m_uniform_tabs = uniform_tabs; }
  59. int uniform_tab_width() const;
  60. void set_bar_visible(bool bar_visible);
  61. bool is_bar_visible() const { return m_bar_visible; };
  62. void set_close_button_enabled(bool close_button_enabled) { m_close_button_enabled = close_button_enabled; };
  63. void set_reorder_allowed(bool reorder_allowed) { m_reorder_allowed = reorder_allowed; }
  64. bool reorder_allowed() const { return m_reorder_allowed; }
  65. Function<void(size_t)> on_tab_count_change;
  66. Function<void(Widget&)> on_change;
  67. Function<void(Widget&)> on_middle_click;
  68. Function<void(Widget&)> on_tab_close_click;
  69. Function<void(Widget&, ContextMenuEvent const&)> on_context_menu_request;
  70. Function<void(Widget&)> on_double_click;
  71. protected:
  72. TabWidget();
  73. virtual void paint_event(PaintEvent&) override;
  74. virtual void child_event(Core::ChildEvent&) override;
  75. virtual void resize_event(ResizeEvent&) override;
  76. virtual void mousedown_event(MouseEvent&) override;
  77. virtual void mouseup_event(MouseEvent&) override;
  78. virtual void mousemove_event(MouseEvent&) override;
  79. virtual void leave_event(Core::Event&) override;
  80. virtual void keydown_event(KeyEvent&) override;
  81. virtual void context_menu_event(ContextMenuEvent&) override;
  82. virtual void doubleclick_event(MouseEvent&) override;
  83. private:
  84. Gfx::IntRect child_rect_for_size(Gfx::IntSize const&) const;
  85. Gfx::IntRect button_rect(size_t index) const;
  86. Gfx::IntRect close_button_rect(size_t index) const;
  87. Gfx::IntRect bar_rect() const;
  88. Gfx::IntRect container_rect() const;
  89. void update_bar();
  90. void update_focus_policy();
  91. int bar_margin() const { return 2; }
  92. RefPtr<Widget> m_active_widget;
  93. struct TabData {
  94. int width(Gfx::Font const&) const;
  95. String title;
  96. RefPtr<Gfx::Bitmap> icon;
  97. Widget* widget { nullptr };
  98. };
  99. Vector<TabData> m_tabs;
  100. TabPosition m_tab_position { TabPosition::Top };
  101. Optional<size_t> m_hovered_tab_index;
  102. Optional<size_t> m_hovered_close_button_index;
  103. Optional<size_t> m_pressed_close_button_index;
  104. GUI::Margins m_container_margins { 2, 2, 2, 2 };
  105. Gfx::TextAlignment m_text_alignment { Gfx::TextAlignment::Center };
  106. bool m_uniform_tabs { false };
  107. bool m_bar_visible { true };
  108. bool m_close_button_enabled { false };
  109. bool m_reorder_allowed { false };
  110. bool m_dragging_active_tab { false };
  111. int m_grab_offset { 0 };
  112. int m_mouse_x { 0 };
  113. void drag_tab(size_t index);
  114. void recalculate_tab_order();
  115. };
  116. }