CODEWITHSUNDEEP
c++mfc
Karudi
Karudi

Reputation: 2792

MFC Unclickable Button (Running away from cursor on MouseMove)

How would i make a button that will change it's position on MouseMove Event if the cursor is close enough to the center of the button in MFC ?

Upvotes: 0

Views: 553

Answers (3)

Seva Alekseyev
Seva Alekseyev

Reputation: 61388

WM_MOUSEMOVE is not delivered to the button if the cursor is not over it (and is not captured, but you don't want that). So you have to process WM_MOUSEMOVE in the parent dialog. If you want your button to be a self-contained control, you have to subclass the parent window upon button creation.

Subclassing, in this context, means:
- you retrieve and store the parent's window proc address with GetParent()->GetWindowLong(GWL_WNDPROC)
- you set it to your procedure with SetWindowLong()
- in the procedure, you call the parent's previous window proc, after handling WM_MOUSEMOVE the way you want.

Upvotes: 2

Dolphin
Dolphin

Reputation: 299

If you track the mouse cursor position you can determine when the cursor gets close to or enters the button window rect. You can then use the SetWindowPos() function to reposition the button window in the parent window client area.

Upvotes: 0

Mark Ransom
Mark Ransom

Reputation: 308452

The WM_MOUSEMOVE coordinates will be relative to the screen, but you'll probably want to track the button position relative to the window that contains it. Use the ScreenToClient method on the parent window to convert, then you can compare the coordinates to see if it's close. Then use MoveWindow to move the button.

Upvotes: 1

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