3f66f6a5b3
This keyword is not expanded by Git which means it's not replaced with the correct revision value in the releases made using git-based scripts and it's confusing to have lines with unexpanded "$Id$" in the released files. As expanding them with Git is not that simple (it could be done with git archive and export-subst attribute) and there are not many benefits in having them in the first place, just remove all these lines. If nothing else, this will make an eventual transition to Git simpler. Closes #14487. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74602 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
249 lines
9.9 KiB
Objective-C
249 lines
9.9 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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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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