Always draw the selection of selected items, not just when they have

[wxWidgets.git] / docs / latex / wx / memorydc.tex

diff --git a/docs/latex/wx/memorydc.tex b/docs/latex/wx/memorydc.tex
index fe12b8ce0c26e90e9c393319cea98e6c9ecb27d0..c3e4f16ce9375ab2100ccbd2695ded6a8351cb4d 100644 (file)
--- a/docs/latex/wx/memorydc.tex
+++ b/docs/latex/wx/memorydc.tex
@@ -1,7 +1,8 @@
 \section{\class{wxMemoryDC}}\label{wxmemorydc}
 
 A memory device context provides a means to draw graphics onto a bitmap. When
-drawing in to a mono-bitmap, using {\tt wxWHITE}, {\tt wxWHITE_PEN} and {\tt wxWHITE_BRUSH}
+drawing in to a mono-bitmap, using {\tt wxWHITE}, {\tt wxWHITE\_PEN} and
+{\tt wxWHITE\_BRUSH}
 will draw the background colour (i.e. 0) whereas all other colours will draw the
 foreground colour (i.e. 1).
 
@@ -38,27 +39,58 @@ can be reselected into another memory DC.
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
-\membersection{wxMemoryDC::wxMemoryDC}
+\membersection{wxMemoryDC::wxMemoryDC}\label{wxmemorydcctor}
 
 \func{}{wxMemoryDC}{\void}
 
 Constructs a new memory device context.
 
-Use the {\it Ok} member to test whether the constructor was successful
-in creating a useable device context. Don't forget to select a bitmap
-into the DC before drawing on it.
+Use the \helpref{IsOk}{wxdcisok} member to test whether the constructor was successful
+in creating a usable device context.
+Don't forget to select a bitmap into the DC before drawing on it.
 
-\membersection{wxMemoryDC::SelectObject}
+\func{}{wxMemoryDC}{\param{wxBitmap\& }{bitmap}}
 
-\func{}{SelectObject}{\param{const wxBitmap\& }{bitmap}}
+Constructs a new memory device context and calls \helpref{SelectObject}{wxmemorydcselectobject}
+with the given bitmap.
+Use the \helpref{IsOk}{wxdcisok} member to test whether the constructor was successful
+in creating a usable device context.
+
+
+\membersection{wxMemoryDC::SelectObject}\label{wxmemorydcselectobject}
+
+\func{void}{SelectObject}{\param{wxBitmap\& }{bitmap}}
+
+Works exactly like \helpref{SelectObjectAsSource}{wxmemorydcselectobjectassource} but
+this is the function you should use when you select a bitmap because you want to modify
+it, e.g. drawing on this DC.
+
+Be careful to use this function and not \helpref{SelectObjectAsSource}{wxmemorydcselectobjectassource}
+when you want to modify the bitmap you are selecting otherwise you may incurr in some
+problems related to wxBitmap being a reference counted object
+(see \helpref{reference counting overview}{trefcount}).
+
+\wxheading{See also}
+
+\helpref{wxDC::DrawBitmap}{wxdcdrawbitmap}
+
+
+
+\membersection{wxMemoryDC::SelectObjectAsSource}\label{wxmemorydcselectobjectassource}
+
+\func{void}{SelectObjectAsSource}{\param{const wxBitmap\& }{bitmap}}
 
 Selects the given bitmap into the device context, to use as the memory
 bitmap. Selecting the bitmap into a memory DC allows you to draw into
-the DC (and therefore the bitmap) and also to use {\bf Blit} to copy
+the DC (and therefore the bitmap) and also to use \helpref{wxDC::Blit}{wxdcblit} to copy
 the bitmap to a window. For this purpose, you may find \helpref{wxDC::DrawIcon}{wxdcdrawicon}\rtfsp
 easier to use instead.
 
-If the argument is wxNullBitmap (or some other uninitialised wxBitmap) the current bitmap is selected out of the device
-context, and the original bitmap restored, allowing the current bitmap to
+If the argument is wxNullBitmap (or some other uninitialised wxBitmap) the current bitmap is
+selected out of the device context, and the original bitmap restored, allowing the current bitmap to
 be destroyed safely.
 
+\wxheading{See also}
+
+\helpref{wxMemoryDC::SelectObject}{wxmemorydcselectobject}
+