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Diffstat (limited to 'views/controls/scrollbar/base_scroll_bar.h')
| -rw-r--r-- | views/controls/scrollbar/base_scroll_bar.h | 156 |
1 files changed, 0 insertions, 156 deletions
diff --git a/views/controls/scrollbar/base_scroll_bar.h b/views/controls/scrollbar/base_scroll_bar.h deleted file mode 100644 index 7a88459..0000000 --- a/views/controls/scrollbar/base_scroll_bar.h +++ /dev/null @@ -1,156 +0,0 @@ -// 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 VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_H_ -#define VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_H_ -#pragma once - -#include "views/context_menu_controller.h" -#include "views/controls/button/image_button.h" -#include "views/controls/menu/menu.h" -#include "views/controls/scrollbar/scroll_bar.h" -#include "views/repeat_controller.h" - -namespace views { - -class BaseScrollBarThumb; - -/////////////////////////////////////////////////////////////////////////////// -// -// BaseScrollBar -// -/////////////////////////////////////////////////////////////////////////////// -class BaseScrollBar : public ScrollBar, - public ContextMenuController, - public Menu::Delegate { - public: - BaseScrollBar(bool horizontal, BaseScrollBarThumb* thumb); - virtual ~BaseScrollBar() { } - - // Get the bounds of the "track" area that the thumb is free to slide within. - virtual gfx::Rect GetTrackBounds() const = 0; - - // An enumeration of different amounts of incremental scroll, representing - // events sent from different parts of the UI/keyboard. - enum ScrollAmount { - SCROLL_NONE = 0, - SCROLL_START, - SCROLL_END, - SCROLL_PREV_LINE, - SCROLL_NEXT_LINE, - SCROLL_PREV_PAGE, - SCROLL_NEXT_PAGE, - }; - - // Scroll the contents by the specified type (see ScrollAmount above). - void ScrollByAmount(ScrollAmount amount); - - // Scroll the contents to the appropriate position given the supplied - // position of the thumb (thumb track coordinates). If |scroll_to_middle| is - // true, then the conversion assumes |thumb_position| is in the middle of the - // thumb rather than the top. - void ScrollToThumbPosition(int thumb_position, bool scroll_to_middle); - - // Scroll the contents by the specified offset (contents coordinates). - void ScrollByContentsOffset(int contents_offset); - - // View overrides: - virtual gfx::Size GetPreferredSize() OVERRIDE = 0; - virtual void Layout() OVERRIDE = 0; - virtual bool OnMousePressed(const MouseEvent& event) OVERRIDE; - virtual void OnMouseReleased(const MouseEvent& event) OVERRIDE; - virtual void OnMouseCaptureLost() OVERRIDE; - virtual bool OnKeyPressed(const KeyEvent& event) OVERRIDE; - virtual bool OnMouseWheel(const MouseWheelEvent& event) OVERRIDE; - - // ScrollBar overrides: - virtual void Update(int viewport_size, - int content_size, - int contents_scroll_offset) OVERRIDE; - virtual int GetLayoutSize() const OVERRIDE = 0; - virtual int GetPosition() const OVERRIDE; - - // ContextMenuController overrides. - virtual void ShowContextMenuForView(View* source, - const gfx::Point& p, - bool is_mouse_gesture) OVERRIDE; - - // Menu::Delegate overrides: - virtual std::wstring GetLabel(int id) const OVERRIDE; - virtual bool IsCommandEnabled(int id) const OVERRIDE; - virtual void ExecuteCommand(int id) OVERRIDE; - - protected: - // View overrides: - virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE = 0; - - BaseScrollBarThumb* GetThumb() const; - - CustomButton::ButtonState GetThumbTrackState() const; - - // Wrapper functions that calls the controller. We need this since native - // scrollbars wrap around a different scrollbar. When calling the controller - // we need to pass in the appropriate scrollbar. For normal scrollbars it's - // the |this| scrollbar, for native scrollbars it's the native scrollbar used - // to create this. - virtual void ScrollToPosition(int position); - virtual int GetScrollIncrement(bool is_page, bool is_positive); - - private: - // Called when the mouse is pressed down in the track area. - void TrackClicked(); - - // Responsible for scrolling the contents and also updating the UI to the - // current value of the Scroll Offset. - void ScrollContentsToOffset(); - - // Returns the size (width or height) of the track area of the ScrollBar. - int GetTrackSize() const; - - // Calculate the position of the thumb within the track based on the - // specified scroll offset of the contents. - int CalculateThumbPosition(int contents_scroll_offset) const; - - // Calculates the current value of the contents offset (contents coordinates) - // based on the current thumb position (thumb track coordinates). See - // |ScrollToThumbPosition| for an explanation of |scroll_to_middle|. - int CalculateContentsOffset(int thumb_position, - bool scroll_to_middle) const; - - // Called when the state of the thumb track changes (e.g. by the user - // pressing the mouse button down in it). - void SetThumbTrackState(CustomButton::ButtonState state); - - BaseScrollBarThumb* thumb_; - - // The size of the scrolled contents, in pixels. - int contents_size_; - - // The current amount the contents is offset by in the viewport. - int contents_scroll_offset_; - - // The state of the scrollbar track. Typically, the track will highlight when - // the user presses the mouse on them (during page scrolling). - CustomButton::ButtonState thumb_track_state_; - - // The last amount of incremental scroll that this scrollbar performed. This - // is accessed by the callbacks for the auto-repeat up/down buttons to know - // what direction to repeatedly scroll in. - ScrollAmount last_scroll_amount_; - - // An instance of a RepeatController which scrolls the scrollbar continuously - // as the user presses the mouse button down on the up/down buttons or the - // track. - RepeatController repeater_; - - // The position of the mouse within the scroll bar when the context menu - // was invoked. - int context_menu_mouse_position_; - - DISALLOW_COPY_AND_ASSIGN(BaseScrollBar); -}; - -} // namespace views - -#endif // VIEWS_CONTROLS_SCROLLBAR_BASE_SCROLL_BAR_H_ |