/////////////////////////////////////////////////////////////////////////////
/**
- @wxheader{scrolwin.h}
+ Possible values for the second argument of wxScrolled::ShowScrollbars().
+ */
+enum wxScrollbarVisibility
+{
+ wxSHOW_SB_NEVER = -1, ///< Never show the scrollbar at all.
+ wxSHOW_SB_DEFAULT, ///< Show scrollbar only if it is needed.
+ wxSHOW_SB_ALWAYS ///< Always show scrollbar, even if not needed.
+};
+
+/**
The wxScrolled class manages scrolling for its client area, transforming
the coordinates according to the scrollbar positions, and setting the
wxWindow::SetVirtualSizeHints() with wxWindow::SetMinVirtualSize() or
similar and remove it entirely in future.
+ @todo review docs for this class replacing SetVirtualSizeHints() with
+ SetMinClientSize().
+
As with all windows, an application can draw onto a wxScrolled using a
@ref overview_dc "device context".
image.
It sets the device origin according to the current scroll position.
- DoPrepareDC() is called automatically within the default OnPaint()
- event handler, so your OnDraw() override will be passed a
+ DoPrepareDC() is called automatically within the default @c wxEVT_PAINT
+ event handler, so your OnDraw() override will be passed an already
'pre-scrolled' device context. However, if you wish to draw from
- outside of OnDraw() (via OnPaint()), or you wish to implement OnPaint()
- yourself, you must call this function yourself.
+ outside of OnDraw() (e.g. from your own @c wxEVT_PAINT handler), you
+ must call this function yourself.
For example:
@code
}
@endcode
+ Notice that the function sets the origin by moving it relatively to the
+ current origin position, so you shouldn't change the origin before
+ calling DoPrepareDC() or, if you do, reset it to (0, 0) later. If you
+ call DoPrepareDC() immediately after device context creation, as in the
+ example above, this problem doesn't arise, of course, so it is
+ customary to do it like this.
*/
void DoPrepareDC(wxDC& dc);
*/
void EnableScrolling(bool xScrolling, bool yScrolling);
+ /**
+ Set the scrollbar visibility.
+
+ By default the scrollbar in the corresponding direction is only shown
+ if it is needed, i.e. if the virtual size of the scrolled window in
+ this direction is greater than the current physical window size. Using
+ this function the scrollbar visibility can be changed to be:
+ - wxSHOW_SB_ALWAYS: To always show the scrollbar, even if it is
+ not needed currently (wxALWAYS_SHOW_SB style can be used during
+ the window creation to achieve the same effect but it applies
+ in both directions).
+ - wxSHOW_SB_NEVER: To never show the scrollbar at all. In this case
+ the program should presumably provide some other way for the
+ user to scroll the window.
+ - wxSHOW_SB_DEFAULT: To restore the default behaviour described
+ above.
+
+ @param horz
+ The desired visibility for the horizontal scrollbar.
+ @param vert
+ The desired visibility for the vertical scrollbar.
+
+ @since 2.9.0
+ */
+ void ShowScrollbars(wxScrollbarVisibility horz, wxScrollbarVisibility vert);
+
/**
Get the number of pixels per scroll unit (line), in each direction, as
set by SetScrollbars(). A value of zero indicates no scrolling in that
@param y
Receives the first visible y position in scroll units.
- @remarks If either of the scrollbars is not at the home position, x
- and/or y will be greater than zero. Combined with
- wxWindow::GetClientSize(), the application can use this
- function to efficiently redraw only the visible portion
- of the window. The positions are in logical scroll
- units, not pixels, so to convert to pixels you will
- have to multiply by the number of pixels per scroll
- increment.
+ @remarks
+ If either of the scrollbars is not at the home position, @a x
+ and/or @a y will be greater than zero.
+ Combined with wxWindow::GetClientSize(), the application can use this
+ function to efficiently redraw only the visible portion of the window.
+ The positions are in logical scroll units, not pixels, so to convert
+ to pixels you will have to multiply by the number of pixels per scroll
+ increment.
- @see SetScrollbars()
+ @see SetScrollbars(), Scroll()
*/
void GetViewStart(int* x, int* y) const;
+ /**
+ This is a simple overload of GetViewStart(int*,int*); see that function
+ for more info.
+ */
+ wxPoint GetViewStart() const;
+
/**
Gets the size in device units of the scrollable window area (as
opposed to the client size, which is the area of the window currently
@remarks The positions are in scroll units, not pixels, so to convert to
pixels you will have to multiply by the number of
- pixels per scroll increment. If either parameter is -1,
- that position will be ignored (no change in that
- direction).
+ pixels per scroll increment. If either parameter is
+ ::wxDefaultCoord (-1), that position will be ignored (no change
+ in that direction).
@see SetScrollbars(), GetScrollPixelsPerUnit()
*/
void Scroll(int x, int y);
+ /**
+ This is an overload of Scroll(int,int); see that function for more info.
+ */
+ void Scroll(const wxPoint& pt);
+
/**
Set the horizontal and vertical scrolling increment only. See the
pixelsPerUnit parameter in SetScrollbars().
bool noRefresh = false);
/**
- Call this function to tell wxScrolled to perform the actual
- scrolling on a different window (and not on itself).
+ 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);
+ void SetTargetWindow(wxWindow *window);
+
+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);
};
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