624 lines
24 KiB
C++
624 lines
24 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: scrolwin.h
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// Purpose: interface of wxScrolled template
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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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Possible values for the second argument of wxScrolled::ShowScrollbars().
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*/
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enum wxScrollbarVisibility
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{
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wxSHOW_SB_NEVER = -1, ///< Never show the scrollbar at all.
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wxSHOW_SB_DEFAULT, ///< Show scrollbar only if it is needed.
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wxSHOW_SB_ALWAYS ///< Always show scrollbar, even if not needed.
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};
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/**
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The wxScrolled class manages scrolling for its client area, transforming
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the coordinates according to the scrollbar positions, and setting the
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scroll positions, thumb sizes and ranges according to the area in view.
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There are two commonly used (but not the only possible!) specializations of
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this class:
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- ::wxScrolledWindow, aka wxScrolled<wxPanel>, is equivalent to
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::wxScrolledWindow from earlier versions. Derived from wxPanel, it shares
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wxPanel's behaviour with regard to TAB traversal and focus handling. Use
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this if the scrolled window will have child controls.
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- ::wxScrolledCanvas, aka wxScrolled<wxWindow>, derives from wxWindow and
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so doesn't handle children specially. This is suitable e.g. for
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implementing scrollable controls such as tree or list controls.
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Starting from version 2.4 of wxWidgets, there are several ways to use a
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::wxScrolledWindow (and now wxScrolled). In particular, there are
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three ways to set the size of the scrolling area:
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One way is to set the scrollbars directly using a call to SetScrollbars().
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This is the way it used to be in any previous version of wxWidgets and it
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will be kept for backwards compatibility.
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An additional method of manual control, which requires a little less
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computation of your own, is to set the total size of the scrolling area by
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calling either wxWindow::SetVirtualSize(), or wxWindow::FitInside(), and
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setting the scrolling increments for it by calling SetScrollRate().
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Scrolling in some orientation is enabled by setting a non-zero increment
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for it.
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The most automatic and newest way is to simply let sizers determine the
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scrolling area. This is now the default when you set an interior sizer into
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a wxScrolled with wxWindow::SetSizer(). The scrolling area will be
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set to the size requested by the sizer and the scrollbars will be assigned
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for each orientation according to the need for them and the scrolling
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increment set by SetScrollRate(). As above, scrolling is only enabled in
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orientations with a non-zero increment. You can influence the minimum size
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of the scrolled area controlled by a sizer by calling
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wxWindow::SetVirtualSizeHints(). (Calling SetScrollbars() has analogous
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effects in wxWidgets 2.4 -- in later versions it may not continue to
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override the sizer.)
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Note that if maximum size hints are still supported by
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wxWindow::SetVirtualSizeHints(), use them at your own dire risk. They may
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or may not have been removed for 2.4, but it really only makes sense to set
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minimum size hints here. We should probably replace
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wxWindow::SetVirtualSizeHints() with wxWindow::SetMinVirtualSize() or
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similar and remove it entirely in future.
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@todo review docs for this class replacing SetVirtualSizeHints() with
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SetMinClientSize().
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As with all windows, an application can draw onto a wxScrolled using a
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@ref overview_dc "device context".
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You have the option of handling the OnPaint handler or overriding the
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wxScrolled::OnDraw() function, which is passed a pre-scrolled device
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context (prepared by wxScrolled::DoPrepareDC()).
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If you don't wish to calculate your own scrolling, you must call
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DoPrepareDC() when not drawing from within OnDraw(), to set the device
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origin for the device context according to the current scroll position.
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A wxScrolled will normally scroll itself and therefore its child windows
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as well. It might however be desired to scroll a different window than
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itself: e.g. when designing a spreadsheet, you will normally only have to
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scroll the (usually white) cell area, whereas the (usually grey) label area
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will scroll very differently. For this special purpose, you can call
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SetTargetWindow() which means that pressing the scrollbars will scroll a
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different window.
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Note that the underlying system knows nothing about scrolling coordinates,
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so that all system functions (mouse events, expose events, refresh calls
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etc) as well as the position of subwindows are relative to the "physical"
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origin of the scrolled window. If the user insert a child window at
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position (10,10) and scrolls the window down 100 pixels (moving the child
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window out of the visible area), the child window will report a position
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of (10,-90).
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@beginStyleTable
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@style{wxHSCROLL}
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If this style is specified and ::wxVSCROLL isn't, the window will be
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scrollable only in horizontal direction (by default, i.e. if neither
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this style nor ::wxVSCROLL is specified, it scrolls in both
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directions).
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@style{wxVSCROLL}
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If this style is specified and ::wxHSCROLL isn't, the window will be
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scrollable only in vertical direction (by default, i.e. if neither
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this style nor ::wxHSCROLL is specified, it scrolls in both
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directions).
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@style{wxALWAYS_SHOW_SB}
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Since wxWidgets 2.9.5, specifying this style makes the window always
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show its scrollbars, even if they are not used. See ShowScrollbars().
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@style{wxRETAINED}
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Uses a backing pixmap to speed refreshes. Motif only.
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@endStyleTable
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@beginEventEmissionTable{wxScrollWinEvent}
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@event{EVT_SCROLLWIN(func)}
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Process all scroll events.
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@event{EVT_SCROLLWIN_TOP(func)}
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Process @c wxEVT_SCROLLWIN_TOP scroll-to-top events.
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@event{EVT_SCROLLWIN_BOTTOM(func)}
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Process @c wxEVT_SCROLLWIN_BOTTOM scroll-to-bottom events.
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@event{EVT_SCROLLWIN_LINEUP(func)}
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Process @c wxEVT_SCROLLWIN_LINEUP line up events.
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@event{EVT_SCROLLWIN_LINEDOWN(func)}
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Process @c wxEVT_SCROLLWIN_LINEDOWN line down events.
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@event{EVT_SCROLLWIN_PAGEUP(func)}
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Process @c wxEVT_SCROLLWIN_PAGEUP page up events.
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@event{EVT_SCROLLWIN_PAGEDOWN(func)}
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Process @c wxEVT_SCROLLWIN_PAGEDOWN page down events.
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@event{EVT_SCROLLWIN_THUMBTRACK(func)}
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Process @c wxEVT_SCROLLWIN_THUMBTRACK thumbtrack events
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(frequent events sent as the user drags the thumbtrack).
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@event{EVT_SCROLLWIN_THUMBRELEASE(func)}
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Process @c wxEVT_SCROLLWIN_THUMBRELEASE thumb release events.
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@endEventTable
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@note
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Don't confuse wxScrollWinEvents generated by this class with
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wxScrollEvent objects generated by wxScrollBar and wxSlider.
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@remarks
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Use wxScrolled for applications where the user scrolls by a fixed amount,
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and where a 'page' can be interpreted to be the current visible portion of
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the window. For more sophisticated applications, use the wxScrolled
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implementation as a guide to build your own scroll behaviour or use
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wxVScrolledWindow or its variants.
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@since The wxScrolled template exists since version 2.9.0. In older versions,
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only ::wxScrolledWindow (equivalent of wxScrolled<wxPanel>) was
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available.
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@library{wxcore}
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@category{miscwnd}
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@see wxScrollBar, wxClientDC, wxPaintDC,
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wxVScrolledWindow, wxHScrolledWindow, wxHVScrolledWindow,
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*/
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template<class T>
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class wxScrolled : public T
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{
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public:
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/// Default constructor.
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wxScrolled();
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/**
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Constructor.
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@param parent
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Parent window.
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@param id
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Window identifier. The value @c wxID_ANY indicates a default value.
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@param pos
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Window position. If a position of ::wxDefaultPosition is specified
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then a default position is chosen.
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@param size
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Window size. If a size of ::wxDefaultSize is specified then the
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window is sized appropriately.
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@param style
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Window style. See wxScrolled.
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@param name
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Window name.
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@remarks The window is initially created without visible scrollbars.
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Call SetScrollbars() to specify how big the virtual window
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size should be.
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*/
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wxScrolled(wxWindow* parent, wxWindowID id = -1,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize,
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long style = wxHSCROLL | wxVSCROLL,
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const wxString& name = "scrolledWindow");
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/**
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Translates the logical coordinates to the device ones. For example, if
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a window is scrolled 10 pixels to the bottom, the device coordinates of
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the origin are (0, 0) (as always), but the logical coordinates are (0,
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10) and so the call to CalcScrolledPosition(0, 10, xx, yy) will return
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0 in yy.
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@beginWxPerlOnly
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In wxPerl this method takes two parameters and returns a
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2-element list (xx, yy).
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@endWxPerlOnly
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@see CalcUnscrolledPosition()
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*/
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void CalcScrolledPosition(int x, int y, int* xx, int* yy) const;
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wxPoint CalcScrolledPosition(const wxPoint& pt) const;
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/**
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Translates the device coordinates to the logical ones. For example, if
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a window is scrolled 10 pixels to the bottom, the device coordinates of
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the origin are (0, 0) (as always), but the logical coordinates are (0,
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10) and so the call to CalcUnscrolledPosition(0, 0, xx, yy) will return
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10 in yy.
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@beginWxPerlOnly
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In wxPerl this method takes two parameters and returns a
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2-element list (xx, yy).
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@endWxPerlOnly
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@see CalcScrolledPosition()
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*/
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void CalcUnscrolledPosition(int x, int y, int* xx, int* yy) const;
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wxPoint CalcUnscrolledPosition(const wxPoint& pt) const;
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/**
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Creates the window for two-step construction. Derived classes
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should call or replace this function. See wxScrolled::wxScrolled()
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for details.
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*/
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bool Create(wxWindow* parent, wxWindowID id = -1,
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const wxPoint& pos = wxDefaultPosition,
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const wxSize& size = wxDefaultSize,
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long style = wxHSCROLL | wxVSCROLL,
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const wxString& name = "scrolledWindow");
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/**
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Disable use of keyboard keys for scrolling.
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By default cursor movement keys (including Home, End, Page Up and Down)
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are used to scroll the window appropriately. If the derived class uses
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these keys for something else, e.g. changing the currently selected
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item, this function can be used to disable this behaviour as it's not
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only not necessary then but can actually be actively harmful if another
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object forwards a keyboard event corresponding to one of the above keys
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to us using ProcessWindowEvent() because the event will always be
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processed which can be undesirable.
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@since 2.9.1
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*/
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void DisableKeyboardScrolling();
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/**
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Call this function to prepare the device context for drawing a scrolled
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image.
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It sets the device origin according to the current scroll position.
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DoPrepareDC() is called automatically within the default @c wxEVT_PAINT
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event handler, so your OnDraw() override will be passed an already
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'pre-scrolled' device context. However, if you wish to draw from
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outside of OnDraw() (e.g. from your own @c wxEVT_PAINT handler), you
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must call this function yourself.
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For example:
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@code
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void MyWindow::OnEvent(wxMouseEvent& event)
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{
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wxClientDC dc(this);
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DoPrepareDC(dc);
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dc.SetPen(*wxBLACK_PEN);
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float x, y;
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event.Position(&x, &y);
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if (xpos > -1 && ypos > -1 && event.Dragging())
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{
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dc.DrawLine(xpos, ypos, x, y);
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}
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xpos = x;
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ypos = y;
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}
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@endcode
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Notice that the function sets the origin by moving it relatively to the
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current origin position, so you shouldn't change the origin before
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calling DoPrepareDC() or, if you do, reset it to (0, 0) later. If you
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call DoPrepareDC() immediately after device context creation, as in the
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example above, this problem doesn't arise, of course, so it is
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customary to do it like this.
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*/
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void DoPrepareDC(wxDC& dc);
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/**
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Enable or disable use of wxWindow::ScrollWindow() for scrolling.
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By default, when a scrolled window is logically scrolled,
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wxWindow::ScrollWindow() is called on the underlying window which
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scrolls the window contents and only invalidates the part of the window
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newly brought into view. If @false is passed as an argument, then this
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"physical scrolling" is disabled and the window is entirely invalidated
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whenever it is scrolled by calling wxWindow::Refresh().
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It should be rarely necessary to disable physical scrolling, so this
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method shouldn't be called in normal circumstances.
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@param xScrolling
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If @true, enables physical scrolling in the x direction.
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@param yScrolling
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If @true, enables physical scrolling in the y direction.
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*/
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void EnableScrolling(bool xScrolling, bool yScrolling);
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/**
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Set the scrollbar visibility.
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By default the scrollbar in the corresponding direction is only shown
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if it is needed, i.e. if the virtual size of the scrolled window in
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this direction is greater than the current physical window size. Using
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this function the scrollbar visibility can be changed to be:
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- wxSHOW_SB_ALWAYS: To always show the scrollbar, even if it is
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not needed currently (wxALWAYS_SHOW_SB style can be used during
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the window creation to achieve the same effect but it applies
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in both directions).
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- wxSHOW_SB_NEVER: To never show the scrollbar at all. In this case
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the program should presumably provide some other way for the
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user to scroll the window.
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- wxSHOW_SB_DEFAULT: To restore the default behaviour described
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above.
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@param horz
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The desired visibility for the horizontal scrollbar.
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@param vert
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The desired visibility for the vertical scrollbar.
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@since 2.9.0
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*/
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void ShowScrollbars(wxScrollbarVisibility horz, wxScrollbarVisibility vert);
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/**
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Get the number of pixels per scroll unit (line), in each direction, as
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set by SetScrollbars(). A value of zero indicates no scrolling in that
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direction.
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@param xUnit
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Receives the number of pixels per horizontal unit.
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@param yUnit
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Receives the number of pixels per vertical unit.
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@beginWxPerlOnly
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In wxPerl this method takes no parameters and returns a
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2-element list (xUnit, yUnit).
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@endWxPerlOnly
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@see SetScrollbars(), GetVirtualSize()
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*/
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void GetScrollPixelsPerUnit(int* xUnit, int* yUnit) const;
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/**
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Get the position at which the visible portion of the window starts.
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@param x
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Receives the first visible x position in scroll units.
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@param y
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Receives the first visible y position in scroll units.
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@remarks
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If either of the scrollbars is not at the home position, @a x
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and/or @a y will be greater than zero.
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Combined with wxWindow::GetClientSize(), the application can use this
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function to efficiently redraw only the visible portion of the window.
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The positions are in logical scroll units, not pixels, so to convert
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to pixels you will have to multiply by the number of pixels per scroll
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increment.
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@beginWxPerlOnly
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In wxPerl this method takes no parameters and returns a
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2-element list (x, y).
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@endWxPerlOnly
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@see SetScrollbars(), Scroll()
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*/
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void GetViewStart(int* x, int* y) const;
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/**
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This is a simple overload of GetViewStart(int*,int*); see that function
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for more info.
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*/
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wxPoint GetViewStart() const;
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/**
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Gets the size in device units of the scrollable window area (as
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opposed to the client size, which is the area of the window currently
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visible).
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@param x
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Receives the length of the scrollable window, in pixels.
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@param y
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Receives the height of the scrollable window, in pixels.
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@remarks Use wxDC::DeviceToLogicalX() and wxDC::DeviceToLogicalY() to
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translate these units to logical units.
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@beginWxPerlOnly
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In wxPerl this method takes no parameters and returns a
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2-element list (xUnit, yUnit).
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@endWxPerlOnly
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@see SetScrollbars(), GetScrollPixelsPerUnit()
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*/
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void GetVirtualSize(int* x, int* y) const;
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/**
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Motif only: @true if the window has a backing bitmap.
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*/
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bool IsRetained() const;
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/**
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Called by the default paint event handler to allow the application to
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define painting behaviour without having to worry about calling
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DoPrepareDC().
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Instead of overriding this function you may also just process the paint
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event in the derived class as usual, but then you will have to call
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DoPrepareDC() yourself.
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*/
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virtual void OnDraw(wxDC& dc);
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/**
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This function is for backwards compatibility only and simply calls
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DoPrepareDC() now. Notice that it is not called by the default paint
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event handle (DoPrepareDC() is), so overriding this method in your
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derived class is useless.
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*/
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void PrepareDC(wxDC& dc);
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/**
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Scrolls a window so the view start is at the given point.
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@param x
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The x position to scroll to, in scroll units.
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@param y
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The y position to scroll to, in scroll units.
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@remarks The positions are in scroll units, not pixels, so to convert to
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pixels you will have to multiply by the number of
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pixels per scroll increment. If either parameter is
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::wxDefaultCoord (-1), that position will be ignored (no change
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in that direction).
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@see SetScrollbars(), GetScrollPixelsPerUnit()
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*/
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void Scroll(int x, int y);
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/**
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This is an overload of Scroll(int,int); see that function for more info.
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*/
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void Scroll(const wxPoint& pt);
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/**
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Set the horizontal and vertical scrolling increment only. See the
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pixelsPerUnit parameter in SetScrollbars().
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*/
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void SetScrollRate(int xstep, int ystep);
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/**
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Sets up vertical and/or horizontal scrollbars.
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The first pair of parameters give the number of pixels per 'scroll
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step', i.e. amount moved when the up or down scroll arrows are pressed.
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The second pair gives the length of scrollbar in scroll steps, which
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sets the size of the virtual window.
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@a xPos and @a yPos optionally specify a position to scroll to
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immediately.
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For example, the following gives a window horizontal and vertical
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scrollbars with 20 pixels per scroll step, and a size of 50 steps (1000
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pixels) in each direction:
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@code
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window->SetScrollbars(20, 20, 50, 50);
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@endcode
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wxScrolled manages the page size itself, using the current client
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window size as the page size.
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Note that for more sophisticated scrolling applications, for example
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where scroll steps may be variable according to the position in the
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document, it will be necessary to derive a new class from wxWindow,
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overriding OnSize() and adjusting the scrollbars appropriately.
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@param pixelsPerUnitX
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Pixels per scroll unit in the horizontal direction.
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@param pixelsPerUnitY
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Pixels per scroll unit in the vertical direction.
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@param noUnitsX
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Number of units in the horizontal direction.
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@param noUnitsY
|
|
Number of units in the vertical direction.
|
|
@param xPos
|
|
Position to initialize the scrollbars in the horizontal direction,
|
|
in scroll units.
|
|
@param yPos
|
|
Position to initialize the scrollbars in the vertical direction, in
|
|
scroll units.
|
|
@param noRefresh
|
|
Will not refresh window if @true.
|
|
|
|
@see wxWindow::SetVirtualSize()
|
|
*/
|
|
void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
|
|
int noUnitsX,
|
|
int noUnitsY,
|
|
int xPos = 0,
|
|
int yPos = 0,
|
|
bool noRefresh = false);
|
|
|
|
/**
|
|
Call this function to tell wxScrolled to perform the actual scrolling
|
|
on a different window (and not on itself).
|
|
|
|
This method is useful when only a part of the window should be
|
|
scrolled. A typical example is a control consisting of a fixed header
|
|
and the scrollable contents window: the scrollbars are attached to the
|
|
main window itself, hence it, and not the contents window must be
|
|
derived from wxScrolled, but only the contents window scrolls when the
|
|
scrollbars are used. To implement such setup, you need to call this
|
|
method with the contents window as argument.
|
|
|
|
Notice that if this method is used, GetSizeAvailableForScrollTarget()
|
|
method must be overridden.
|
|
*/
|
|
void SetTargetWindow(wxWindow *window);
|
|
wxWindow *GetTargetWindow() const;
|
|
|
|
|
|
void SetTargetRect(const wxRect& rect);
|
|
wxRect GetTargetRect() const;
|
|
|
|
int GetScrollPageSize(int orient) const;
|
|
void SetScrollPageSize(int orient, int pageSize);
|
|
int GetScrollLines( int orient ) const;
|
|
void SetScale(double xs, double ys);
|
|
double GetScaleX() const;
|
|
double GetScaleY() const;
|
|
|
|
virtual void AdjustScrollbars();
|
|
|
|
/**
|
|
Are we generating the autoscroll events?
|
|
*/
|
|
bool IsAutoScrolling() const;
|
|
|
|
/**
|
|
Stop generating the scroll events when mouse is held outside the
|
|
window.
|
|
*/
|
|
void StopAutoScrolling();
|
|
|
|
/**
|
|
This method can be overridden in a derived class to forbid sending the
|
|
auto scroll events - note that unlike StopAutoScrolling() it doesn't
|
|
stop the timer, so it will be called repeatedly and will typically
|
|
return different values depending on the current mouse position
|
|
|
|
The base class version just returns true.
|
|
*/
|
|
virtual bool SendAutoScrollEvents(wxScrollWinEvent& event) const;
|
|
|
|
|
|
protected:
|
|
/**
|
|
Function which must be overridden to implement the size available for
|
|
the scroll target for the given size of the main window.
|
|
|
|
This method must be overridden if SetTargetWindow() is used (it is
|
|
never called otherwise). The implementation should decrease the @a size
|
|
to account for the size of the non-scrollable parts of the main window
|
|
and return only the size available for the scrollable window itself.
|
|
E.g. in the example given in SetTargetWindow() documentation the
|
|
function would subtract the height of the header window from the
|
|
vertical component of @a size.
|
|
*/
|
|
virtual wxSize GetSizeAvailableForScrollTarget(const wxSize& size);
|
|
};
|
|
|
|
|
|
/**
|
|
Scrolled window derived from wxPanel.
|
|
|
|
See wxScrolled for a detailed description.
|
|
|
|
@note Note that because this class derives from wxPanel, it shares its
|
|
behaviour with regard to TAB traversal and focus handling (in
|
|
particular, it forwards focus to its children). If you don't want
|
|
this behaviour, use ::wxScrolledCanvas instead.
|
|
|
|
@note ::wxScrolledWindow is an alias for wxScrolled<wxPanel> since version
|
|
2.9.0. In older versions, it was a standalone class.
|
|
|
|
@library{wxcore}
|
|
@category{miscwnd}
|
|
|
|
@see wxScrolled, ::wxScrolledCanvas
|
|
*/
|
|
typedef wxScrolled<wxPanel> wxScrolledWindow;
|
|
|
|
/**
|
|
Alias for wxScrolled<wxWindow>. Scrolled window that doesn't have children
|
|
and so doesn't need or want special handling of TAB traversal.
|
|
|
|
@since 2.9.0
|
|
|
|
@library{wxcore}
|
|
@category{miscwnd}
|
|
|
|
@see wxScrolled, ::wxScrolledWindow
|
|
*/
|
|
typedef wxScrolled<wxWindow> wxScrolledCanvas;
|