How to create a non-modal form but blocking?

Question

Should sound weird, but this is just for my hobby. I would want a (custom) messagebox to pop up with a YesNo buttons which should ideally block the code. But I should be able to click on the parent form so that I can dismiss the message box without having to specifically click on the messagebox buttons (equivalent to clicking No on the message box)..

something like this:

     void Foo()
     {
         CustomMsgBox.Show("do you really wanna delete?", CustomMsgBox.Buttons.YesNo);
         //block the code here, but user should be able to click on form, so that its equivalent to have clicked No;
         //if clicked No, return;

         //delete.
     }

So the solution I thought was make the custom message box non modal - so that user can click on form, but I'm not able to block code.. How can i do that?

It would look like this:

 void Foo()
 {
     NonModalMsgBox.Show("do you really wanna delete?", CustomMsgBox.Buttons.YesNo);
     //block thread till user clicks on form or messagebox buttons.
     //unblock when user clicks.
     //if No, return;

     //delete.
 }

Edit: I know this is not a standard practice and I know non modal forms do not block, while modal forms do. So please do not recommend to be content with either modal form's or non-modal form's behavior. My question would be is there any way to simulate the behaviour of ContextMenu with windows forms.

Answer 1

You can solve this quite easily. Create and use a modal dialog but override the WndProc of the dialog and process the WM_MOUSEDOWN event. Check the position of the mouse down and if it is over the parent window but not over the dialog itself then simply dismiss the dialog.