Re: Scrolling OwnerDrawn Controls

Read the article on understanding AutoScroll in the GDI+ FAQ.

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Bob Powell [MVP]
Visual C#, System.Drawing

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"Shmarya" <shmarya@xxxxxxxxxxxxxxxx> wrote in message
news:%23F3QqxVFGHA.644@xxxxxxxxxxxxxxxxxxxxxxx
> Hi,
>
> I have an issue I've been battling with for a few weeks. I've tried to
> describe it in as much (relevant) detail as possible.
>
> I'd be grateful for any help!
>
> I have a control which has the following layout:
> - A toolbar docked to the top,
> - A content area filling the rest of the control.
>
> The content is drawn into the content area during OnPaint().
>
> The content may be very large, and should be scrollable.
> The size of the content is not known until after it has been drawn.
>
> In essence, the control is similar to a read-only text-editor, it should
> display an unlimited amount of scrollable information.
>
> I have tried the following solutions. Results in []:
> - Implementing scrolling using ScrollBar controls [Slow painting,
> impossible to predict when scrollbars would overlap data on edges]
> - Paint into a panel which has autoscrolling enabled [Maximum height/width
> of panel is 16bit value, not large enough].
> - Paint onto a 'buffer' image (resized as needed) and then onto the
> control surface using offsets from ScrollBar controls as needed
> [System.Drawing.Bitmap seems to have a maximum size too...]
>
> I am quite thoroughly stuck at this point, and would welcome suggestions.
>
> Have I overlooked something basic? Is there an established pattern for
> implementing this?
>
> Thanks,
> Shmarya
>
> (Please CC shmarya DOT rubenstein AT gmail DOT com when replying)
> ---------
> http://shmarya.net
>


.

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