| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_ |
| #define UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_ |
| |
| #include "ui/gfx/size.h" |
| #include "ui/views/controls/button/custom_button.h" |
| #include "ui/views/controls/scrollbar/scroll_bar.h" |
| #include "ui/views/view.h" |
| |
| namespace gfx { |
| class Canvas; |
| } |
| |
| namespace views { |
| |
| class BaseScrollBar; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // BaseScrollBarThumb |
| // |
| // A view that acts as the thumb in the scroll bar track that the user can |
| // drag to scroll the associated contents view within the viewport. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| class VIEWS_EXPORT BaseScrollBarThumb : public View { |
| public: |
| explicit BaseScrollBarThumb(BaseScrollBar* scroll_bar); |
| ~BaseScrollBarThumb() override; |
| |
| // Sets the size (width or height) of the thumb to the specified value. |
| void SetSize(int size); |
| |
| // Retrieves the size (width or height) of the thumb. |
| int GetSize() const; |
| |
| // Sets the position of the thumb on the x or y axis. |
| void SetPosition(int position); |
| |
| // Gets the position of the thumb on the x or y axis. |
| int GetPosition() const; |
| |
| // View overrides: |
| virtual gfx::Size GetPreferredSize() const override = 0; |
| |
| protected: |
| // View overrides: |
| virtual void OnPaint(gfx::Canvas* canvas) override = 0; |
| void OnMouseEntered(const ui::MouseEvent& event) override; |
| void OnMouseExited(const ui::MouseEvent& event) override; |
| bool OnMousePressed(const ui::MouseEvent& event) override; |
| bool OnMouseDragged(const ui::MouseEvent& event) override; |
| void OnMouseReleased(const ui::MouseEvent& event) override; |
| void OnMouseCaptureLost() override; |
| |
| CustomButton::ButtonState GetState() const; |
| // Update our state and schedule a repaint when the mouse moves over us. |
| void SetState(CustomButton::ButtonState state); |
| |
| BaseScrollBar* scroll_bar() { return scroll_bar_; } |
| |
| private: |
| // The BaseScrollBar that owns us. |
| BaseScrollBar* scroll_bar_; |
| |
| int drag_start_position_; |
| |
| // The position of the mouse on the scroll axis relative to the top of this |
| // View when the drag started. |
| int mouse_offset_; |
| |
| // The current state of the thumb button. |
| CustomButton::ButtonState state_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BaseScrollBarThumb); |
| }; |
| |
| } // namespace views |
| |
| #endif // UI_VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_THUMB_H_ |