GDI+ persistence

[Bob Altman]

Hi all,

I have an app that uses GDI+ to write some text to a Panel control on a form.
When another window obscures the form, the text that was hidden behind the other
window is "erased".

How do I tell the Panel control to remember the text that was drawn on it and to
automatically redraw itself when necessary (without my having to do the
bookkeeping and redraw the text myself)?

TIA - Bob

 

[kimiraikkonen]

Hi all,

I have an app that uses GDI+ to write some text to a Panel control on a form.
When another window obscures the form, the text that was hidden behind theother
window is "erased".

How do I tell the Panel control to remember the text that was drawn on it and to
automatically redraw itself when necessary (without my having to do the
bookkeeping and redraw the text myself)?

TIA - Bob

Bob,
Without being sure about your problem, I was experiencing similar
problem that the changes on a picturebox wasn't taking effect till you
move it somewhere out of screen, then "refresh()" method fixed it.

HTH,

Onur Güzel

 

[Herfried K. Wagner [MVP]]

I have an app that uses GDI+ to write some text to a Panel control on a
form. When another window obscures the form, the text that was hidden
behind the other window is "erased".

How do I tell the Panel control to remember the text that was drawn on it
and to automatically redraw itself when necessary (without my having to do
the bookkeeping and redraw the text myself)?

The way you do not want to choose is the way drawing in Win32 UIs works.
However, if generating the drawing is a time-consuming process, you may want
to buffer it in a bitmap object and draw the bitmap object onto the surface
in the control's 'OnPaint' method/'Paint' event handler.

 

[Linda Liu[MSFT]]

Hi Bob,

How do I tell the Panel control to remember the text that was drawn on it

and to automatically redraw itself when necessary

You need to handle the Paint event of the Panel and draw the text in the
event handler. Thus, the text is drawn on the Panel every time the Panel
redraws itself.

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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[Bob Altman]

How do I tell the Panel control to remember the text that was drawn on it

and to automatically redraw itself when necessary

You need to handle the Paint event of the Panel and draw the text in the
event handler. Thus, the text is drawn on the Panel every time the Panel
redraws itself.

Hope this helps.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

Thanks Linda et. al.

Bob