As with all windows, an application can draw onto a wxScrolledWindow using a \helpref{device context}{dcoverview}.
-You have the option of handling the \helpref{OnPaint}{wxscrolledwindowonpaint} handler
+You have the option of handling the OnPaint handler
or overriding the \helpref{OnDraw}{wxscrolledwindowondraw} function, which is passed
a pre-scrolled device context (prepared by \helpref{PrepareDC}{wxscrolledwindowpreparedc}).
\wxheading{Derived from}
+\helpref{wxPanel}{wxpanel}\\
\helpref{wxWindow}{wxwindow}\\
\helpref{wxEvtHandler}{wxevthandler}\\
\helpref{wxObject}{wxobject}
+\wxheading{Include files}
+
+<wx/scrolwin.h>
+
\wxheading{Window styles}
\twocolwidtha{5cm}
Default constructor.
-\func{}{wxScrolledWindow}{\param{wxWindow*}{ parent}, \param{const wxWindowID }{id = -1},\rtfsp
+\func{}{wxScrolledWindow}{\param{wxWindow*}{ parent}, \param{wxWindowID }{id = -1},\rtfsp
\param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize},\rtfsp
-\param{const long}{ style = wxHSCROLL \pipe wxVSCROLL}, \param{const wxString\& }{name = ``scrolledWindow"}}
+\param{long}{ style = wxHSCROLL \pipe wxVSCROLL}, \param{const wxString\& }{name = ``scrolledWindow"}}
Constructor.
Destructor.
+\membersection{wxScrolledWindow::CalcScrolledPosition}\label{wxscrolledwindowcalcscrolledposition}
+
+\constfunc{void}{CalcScrolledPosition}{
+ \param{int }{x},
+ \param{int }{y},
+ \param{int *}{xx}
+ \param{int *}{yy}}
+
+Translates the logical coordinates to the device ones. For example, if a window is
+scrolled 10 pixels to the bottom, the device coordinates of the origin are (0, 0)
+(as always), but the logical coordinates are (0, 10) and so the call to
+CalcScrolledPosition(0, 0, \&xx, \&yy) will return 10 in yy.
+
+\wxheading{See also}
+
+\helpref{CalcUnscrolledPosition}{wxscrolledwindowcalcunscrolledposition}
+
+\membersection{wxScrolledWindow::CalcUnscrolledPosition}\label{wxscrolledwindowcalcunscrolledposition}
+
+\constfunc{void}{CalcUnscrolledPosition}{
+ \param{int }{x},
+ \param{int }{y},
+ \param{int *}{xx}
+ \param{int *}{yy}}
+
+Translates the device coordinates to the logical ones. For example, if a window is
+scrolled 10 pixels to the bottom, the device coordinates of the origin are (0, 0)
+(as always), but the logical coordinates are (0, 10) and so the call to
+CalcUnscrolledPosition(0, 10, \&xx, \&yy) will return 0 in yy.
+
+\wxheading{See also}
+
+\helpref{CalcScrolledPosition}{wxscrolledwindowcalcscrolledposition}
+
\membersection{wxScrolledWindow::Create}\label{wxscrolledwindowcreate}
-\func{bool}{Create}{\param{wxWindow*}{ parent}, \param{const wxWindowID }{id = -1},\rtfsp
+\func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID }{id = -1},\rtfsp
\param{const wxPoint\& }{pos = wxDefaultPosition}, \param{const wxSize\& }{size = wxDefaultSize},\rtfsp
-\param{const long}{ style = wxHSCROLL \pipe wxVSCROLL}, \param{const wxString\& }{name = ``scrolledWindow"}}
+\param{long}{ style = wxHSCROLL \pipe wxVSCROLL}, \param{const wxString\& }{name = ``scrolledWindow"}}
Creates the window for two-step construction. Derived classes
should call or replace this function. See \helpref{wxScrolledWindow::wxScrolledWindow}{wxscrolledwindowconstr}\rtfsp
\wxheading{See also}
\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
-\helpref{wxScrolledWindow::GetVirtualSize}{wxscrolledwindowgetvirtualsize},\rtfsp
-\helpref{wxWindow::GetScrollPage}{wxwindowgetscrollpage}
+\helpref{wxScrolledWindow::GetVirtualSize}{wxscrolledwindowgetvirtualsize}
\membersection{wxScrolledWindow::GetVirtualSize}\label{wxscrolledwindowgetvirtualsize}
\wxheading{See also}
\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
-\helpref{wxScrolledWindow::GetScrollPixelsPerUnit}{wxscrolledwindowgetscrollpixelsperunit},\rtfsp
-\helpref{wxWindow::GetScrollPage}{wxwindowgetscrollpage}
+\helpref{wxScrolledWindow::GetScrollPixelsPerUnit}{wxscrolledwindowgetscrollpixelsperunit}
\membersection{wxScrolledWindow::IsRetained}\label{wxscrolledwindowisretained}
\constfunc{bool}{IsRetained}{\void}
-TRUE if the window has a backing bitmap.
+Motif only: TRUE if the window has a backing bitmap.
\membersection{wxScrolledWindow::PrepareDC}\label{wxscrolledwindowpreparedc}
Call this function to prepare the device context for drawing a scrolled image. It
sets the device origin according to the current scroll position.
-PrepareDC is called automatically within the default \helpref{wxScrolledWindow::OnPaint}{wxscrolledwindowonpaint} event
+PrepareDC is called automatically within the default wxScrolledWindow::OnPaint event
handler, so your \helpref{wxScrolledWindow::OnDraw}{wxscrolledwindowondraw} override
will be passed a '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. For example:
\begin{verbatim}
-void MyCanvas::OnEvent(wxMouseEvent& event)
+void MyWindow::OnEvent(wxMouseEvent& event)
{
wxClientDC dc(this);
PrepareDC(dc);
\func{virtual void}{OnDraw}{\param{wxDC\& }{dc}}
-Called by the default \helpref{wxScrolledWindow::OnPaint}{wxscrolledwindowonpaint} implementation
-to allow the application to define painting behaviour without having to worry about
-calling \helpref{wxScrolledWindow::PrepareDC}{wxscrolledwindowpreparedc}.
-
-\membersection{wxScrolledWindow::OnPaint}\label{wxscrolledwindowonpaint}
-
-\func{void}{OnPaint}{\param{wxPaintEvent\& }{event}}
-
-Sent to the window when the window must be refreshed.
-
-For more details, see \helpref{wxWindow::OnPaint}{wxwindowonpaint}.
-
-The default implementation for wxScrolledWindow's OnPaint handler is simply:
-
-\begin{verbatim}
-void wxScrolledWindow::OnPaint(wxPaintEvent& event)
-{
- wxPaintDC dc(this);
- PrepareDC(dc);
-
- OnDraw(dc);
-}
-\end{verbatim}
-
-\membersection{wxScrolledWindow::OnScroll}\label{wxscrolledwindowonscroll}
-
-\func{void}{OnScroll}{\param{wxScrollEvent\& }{event}}
-
-Override this function to intercept scroll events. This
-member function implements the default scroll behaviour. If
-you do not call the default function, you will have to manage
-all scrolling behaviour including drawing the window contents
-at an appropriate position relative to the scrollbars.
-
-For more details, see \helpref{wxWindow::OnScroll}{wxwindowonscroll}.
-
-\wxheading{See also}
+Called by the default paint event handler to allow the application to define
+painting behaviour without having to worry about calling
+\helpref{wxScrolledWindow::PrepareDC}{wxscrolledwindowpreparedc}.
-\helpref{wxScrollEvent}{wxscrollevent}
+Instead of overriding this function you may also just process the paint event
+in the derived class as usual, but then you will have to call PrepareDC()
+yourself.
\membersection{wxScrolledWindow::Scroll}\label{wxscrolledwindowscroll}
projects / wxWidgets.git / blobdiff