As an example, imagine a complex snap operation, consisting of two active snappings in a context. Here two indicators on the second image show, that we are snapping perpendicularly and that we are snapping to any point of the line. When we drag out from the snapping intersection, we are not snapping to a point anymore, but we are still snapping perpendicularly to the reference line. For such and similar situations I would like to extend the cursor with different indicators, based on the context, like on these images.

Is it possible in MFC? Or otherwise in a Windows application?

CodePudding user response：

Extending the cursor is not supported, you can only load one. So the best approach is to create all the cursors as .CUR files and then load them as needed.

CodePudding user response：

Cursors can be created programmatically in Win32. The CreateCursor() function creates a cursor taking its dimensions, its hot spot and its AND (black) and XOR (invert) masks as parameters. Therefore you can create or load the basic pointer cursor masks and then add the indicators (either draw them using GDI, if they are simple, or load them from resources), creating the additional cursors you may need. I think it's a quite heavy job to do all these on the fly, so it would best to create all possible indicators during initialization.

The CreateCursor() function seems to create only monochrome cursors, maybe the CreateIconIndirect() function can create color cursors. Also take a look into this Win32 documentation topic: Using Cursors.

Of course this is quite an amount of work. You decide if it's worth or not...