Scrolling with GDI

I'm trying to draw a sort of table onto a UserControl in C#. The table will resemble something like an Excel spreadsheet, with a header at the top and a column visible to the left side (these will always be visible, regardless of scroll state). I'm also going to have a number of vertical columns, each of which will line up with a rectangle on the header. I've split my UserControl into two sectione by adding panels, one for the header and one for the rest. The problem is the scrolling.

I can't see to get the panel to scroll, even though there are rectangles drawn outisde the visible co-ordinates and autoscroll is set to true.

I read that drawing to a bitmap might be an option, but I need to process mouse clicks on elements which are drawn inside the columns. I was thinkining of splitting them each into separate UserControls, then rendering each one and the sub-controls it contains. This would allow me to process mouse events much more easily.

Would this be the best option? Is it even possible to scroll a panel when you're drawing with GDI?

1 Reply

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Mike Hankey18y ago
I had this same problem when I first started working with GDI+. The problem is you can draw outside the viewable area but unless it is dervied from control class you won't be able to see it. I solved this by creating a control Size(1,1) and putting it at the max vert. and horiz. corner of the panel.

Hope this helps,
Mike