249 lines
9.9 KiB
C
249 lines
9.9 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: scrolbar.h
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// Purpose: interface of wxScrollBar
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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@class wxScrollBar
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A wxScrollBar is a control that represents a horizontal or vertical scrollbar.
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It is distinct from the two scrollbars that some windows provide automatically,
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but the two types of scrollbar share the way events are received.
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@remarks
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A scrollbar has the following main attributes: range, thumb size, page size, and position.
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The range is the total number of units associated with the view represented by the scrollbar.
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For a table with 15 columns, the range would be 15.
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The thumb size is the number of units that are currently visible.
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For the table example, the window might be sized so that only 5 columns are
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currently visible, in which case the application would set the thumb size to 5.
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When the thumb size becomes the same as or greater than the range, the scrollbar
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will be automatically hidden on most platforms.
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The page size is the number of units that the scrollbar should scroll by,
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when 'paging' through the data. This value is normally the same as the thumb
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size length, because it is natural to assume that the visible window size defines a page.
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The scrollbar position is the current thumb position.
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Most applications will find it convenient to provide a function called AdjustScrollbars()
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which can be called initially, from an OnSize event handler, and whenever the
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application data changes in size. It will adjust the view, object and page
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size according to the size of the window and the size of the data.
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@beginStyleTable
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@style{wxSB_HORIZONTAL}
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Specifies a horizontal scrollbar.
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@style{wxSB_VERTICAL}
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Specifies a vertical scrollbar.
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@endStyleTable
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@beginEventEmissionTable{wxScrollEvent}
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You can use EVT_COMMAND_SCROLL... macros with window IDs for when intercepting
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scroll events from controls, or EVT_SCROLL... macros without window IDs for
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intercepting scroll events from the receiving window -- except for this,
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the macros behave exactly the same.
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@event{EVT_SCROLL(func)}
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Process all scroll events.
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@event{EVT_SCROLL_TOP(func)}
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Process @c wxEVT_SCROLL_TOP scroll-to-top events (minimum position).
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@event{EVT_SCROLL_BOTTOM(func)}
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Process @c wxEVT_SCROLL_BOTTOM scroll-to-bottom events (maximum position).
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@event{EVT_SCROLL_LINEUP(func)}
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Process @c wxEVT_SCROLL_LINEUP line up events.
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@event{EVT_SCROLL_LINEDOWN(func)}
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Process @c wxEVT_SCROLL_LINEDOWN line down events.
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@event{EVT_SCROLL_PAGEUP(func)}
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Process @c wxEVT_SCROLL_PAGEUP page up events.
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@event{EVT_SCROLL_PAGEDOWN(func)}
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Process @c wxEVT_SCROLL_PAGEDOWN page down events.
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@event{EVT_SCROLL_THUMBTRACK(func)}
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Process @c wxEVT_SCROLL_THUMBTRACK thumbtrack events
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(frequent events sent as the user drags the thumbtrack).
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@event{EVT_SCROLL_THUMBRELEASE(func)}
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Process @c wxEVT_SCROLL_THUMBRELEASE thumb release events.
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@event{EVT_SCROLL_CHANGED(func)}
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Process @c wxEVT_SCROLL_CHANGED end of scrolling events (MSW only).
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@event{EVT_COMMAND_SCROLL(id, func)}
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Process all scroll events.
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@event{EVT_COMMAND_SCROLL_TOP(id, func)}
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Process @c wxEVT_SCROLL_TOP scroll-to-top events (minimum position).
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@event{EVT_COMMAND_SCROLL_BOTTOM(id, func)}
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Process @c wxEVT_SCROLL_BOTTOM scroll-to-bottom events (maximum position).
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@event{EVT_COMMAND_SCROLL_LINEUP(id, func)}
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Process @c wxEVT_SCROLL_LINEUP line up events.
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@event{EVT_COMMAND_SCROLL_LINEDOWN(id, func)}
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Process @c wxEVT_SCROLL_LINEDOWN line down events.
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@event{EVT_COMMAND_SCROLL_PAGEUP(id, func)}
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Process @c wxEVT_SCROLL_PAGEUP page up events.
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@event{EVT_COMMAND_SCROLL_PAGEDOWN(id, func)}
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Process @c wxEVT_SCROLL_PAGEDOWN page down events.
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@event{EVT_COMMAND_SCROLL_THUMBTRACK(id, func)}
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Process @c wxEVT_SCROLL_THUMBTRACK thumbtrack events
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(frequent events sent as the user drags the thumbtrack).
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@event{EVT_COMMAND_SCROLL_THUMBRELEASE(func)}
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Process @c wxEVT_SCROLL_THUMBRELEASE thumb release events.
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@event{EVT_COMMAND_SCROLL_CHANGED(func)}
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Process @c wxEVT_SCROLL_CHANGED end of scrolling events (MSW only).
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@endEventTable
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@section scrollbar_diff The difference between EVT_SCROLL_THUMBRELEASE and EVT_SCROLL_CHANGED
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The EVT_SCROLL_THUMBRELEASE event is only emitted when actually dragging the
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thumb using the mouse and releasing it (This EVT_SCROLL_THUMBRELEASE event
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is also followed by an EVT_SCROLL_CHANGED event).
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The EVT_SCROLL_CHANGED event also occurs when using the keyboard to change
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the thumb position, and when clicking next to the thumb
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(In all these cases the EVT_SCROLL_THUMBRELEASE event does not happen).
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In short, the EVT_SCROLL_CHANGED event is triggered when scrolling/moving has
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finished independently of the way it had started. Please see the widgets sample
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("Slider" page) to see the difference between EVT_SCROLL_THUMBRELEASE and
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EVT_SCROLL_CHANGED in action.
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@library{wxcore}
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@category{ctrl}
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@appearance{scrollbar}
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@see @ref overview_scrolling, @ref overview_events, wxScrolled
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*/
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class wxScrollBar : public wxControl
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{
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public:
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/**
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Default constructor
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*/
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wxScrollBar();
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/**
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Constructor, creating and showing a scrollbar.
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@param parent
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Parent window. Must be non-@NULL.
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@param id
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Window identifier. The value wxID_ANY indicates a default value.
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@param pos
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Window position.
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If ::wxDefaultPosition is specified then a default position is chosen.
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@param size
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Window size.
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If ::wxDefaultSize is specified then a default size is chosen.
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@param style
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Window style. See wxScrollBar.
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@param validator
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Window validator.
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@param name
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Window name.
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@see Create(), wxValidator
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*/
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wxScrollBar(wxWindow* parent, wxWindowID id,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize,
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long style = wxSB_HORIZONTAL,
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const wxValidator& validator = wxDefaultValidator,
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const wxString& name = wxScrollBarNameStr);
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/**
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Destructor, destroying the scrollbar.
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*/
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virtual ~wxScrollBar();
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/**
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Scrollbar creation function called by the scrollbar constructor.
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See wxScrollBar() for details.
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*/
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bool Create(wxWindow* parent, wxWindowID id,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize, long style = wxSB_HORIZONTAL,
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const wxValidator& validator = wxDefaultValidator,
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const wxString& name = wxScrollBarNameStr);
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/**
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Returns the page size of the scrollbar.
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This is the number of scroll units that will be scrolled when the user
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pages up or down. Often it is the same as the thumb size.
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@see SetScrollbar()
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*/
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virtual int GetPageSize() const;
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/**
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Returns the length of the scrollbar.
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@see SetScrollbar()
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*/
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virtual int GetRange() const;
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/**
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Returns the current position of the scrollbar thumb.
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@see SetThumbPosition()
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*/
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virtual int GetThumbPosition() const;
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/**
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Returns the thumb or 'view' size.
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@see SetScrollbar()
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*/
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virtual int GetThumbSize() const;
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/**
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Sets the scrollbar properties.
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@param position
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The position of the scrollbar in scroll units.
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@param thumbSize
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The size of the thumb, or visible portion of the scrollbar, in scroll units.
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@param range
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The maximum position of the scrollbar.
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@param pageSize
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The size of the page size in scroll units. This is the number of units
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the scrollbar will scroll when it is paged up or down.
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Often it is the same as the thumb size.
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@param refresh
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@true to redraw the scrollbar, @false otherwise.
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@remarks
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Let's say you wish to display 50 lines of text, using the same
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font. The window is sized so that you can only see 16 lines at a time.
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You would use:
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@code
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scrollbar->SetScrollbar(0, 16, 50, 15);
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@endcode
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The page size is 1 less than the thumb size so that the last line of
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the previous page will be visible on the next page, to help orient the user.
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Note that with the window at this size, the thumb position can never
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go above 50 minus 16, or 34.
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You can determine how many lines are currently visible by dividing
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the current view size by the character height in pixels.
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When defining your own scrollbar behaviour, you will always need to
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recalculate the scrollbar settings when the window size changes.
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You could therefore put your scrollbar calculations and SetScrollbar()
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call into a function named AdjustScrollbars, which can be called
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initially and also from a wxSizeEvent event handler function.
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*/
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virtual void SetScrollbar(int position, int thumbSize, int range,
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int pageSize,
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bool refresh = true);
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/**
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Sets the position of the scrollbar.
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@param viewStart
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The position of the scrollbar thumb.
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@see GetThumbPosition()
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*/
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virtual void SetThumbPosition(int viewStart);
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/**
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Returns @true for scrollbars that have the vertical style set.
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*/
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bool IsVertical() const;
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};
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