Implementing a 'tag panel' control in Delphi?
delphi, tagging
Solution
Each clickable tag doesn't necessarily have to be its own control. It just has to be a region that you can detect being clicked.
Suppose you represent each area as a Windows region. You can figure out how wide each one should be based on its text with the `TCanvas.TextExtent` function. Then create a region with a function like `CreateRectRgn`. For rounded corners, try `CreateRoundRectRgn` instead. You can test for mouse events in each region with the `PtInRegion` function. You can paint borders around them with `FrameRgn`. The last obstacle is to draw them on the screen so they'll all fit. You're creating the regions and you know their widths, so assign tags to a row until you run out of space, and then start the next line.
Problem
Please have a look at this screenshot alt text http://www.maclife.com/files/u18/Yep3-big.jpg I think these are the main features of such a 'tag panel': 1) Each tag on the panel is a standalone control and can be clicked 2) Auto line wrapping when there is not enough space to show the next tag in the current line. 3) Rounded corner rectangle border for each tag is a nice-to-have feature. I want to implement the similar function in Delphi, Is there an existing control to do this? If not, what's the best way to implement such a control? Thank you.