This dialog is derived from
CDialog. A bitmap is loaded from
a file and a region created based on a transparent colour. The bitmap
is then used to paint the dialog. This demo also demonstrates dragging
the dialog by clicking anywhere on a visible portion of the dialog, timer
events and a button on the transparent dialog.
It is perfect to be used as a splash screen or similar application or as a skeleton
application for non rectangular windows that are shaped by a supplied bitmap.
You should be able to use this demo as a skeleton application for your own
A standard CDialog MFC EXE application was created with the wizard and apart
from the standard supplied code, the following functions were overridden.
|Used to clean up some resources on exit.
|Used to paint the bimap into the region.
void OnSize(UINT nType, int cx, int cy)
|Used to create the region and position and resize the dialog.
void OnLButtonDown(UINT nFlags, CPoint point)
|To allow the dialog to be dragged by clicking anywhere.
A button was created to allow the user to close the dialog. A timer was
created to demonstrate auto closing after a period of time.
The image is a normal bmp file that is loaded by the app and used to paint
TRANSPARENTCOLOR is defined in the dialog class header as
bright purple (
RGB(255, 0, 255), but this could be changed to any colour
The dialog window is auto sized to the size of the loaded bitmap then a
region created based on the transparent colour. The dialog is then positioned in
the centre of the current screen. This was done as an example for those who want
to use this application as a splash windows.
An example of using this class is as follows:
int nResponse = dlg.DoModal();
The button serves no real purpose and was made a close button simply to
demonstrate using a button.
V1.0 initial release 27th November 2002