' Dragging Popup Window Demo
' By Brent D. Thorn, 2006
' PUBLIC DOMAIN
' This demo uses the WMLiberty DLL to trap the mouse's left-click in a
' popup-type window as a means to move the window around on the screen.
NoMainWin
WindowWidth = 320
WindowHeight = 320
' Place static text over most of the window.
' And make it with a sunken-looking frame.
StaticText #pop.lbl, "", 9, 9, 300, 300
StyleBits #pop.lbl, _SS_SUNKEN, 0, 0, 0
Open "" For Window_Popup As #pop
#pop "TrapClose Quit"
#pop "Font Arial 16"
#pop.lbl "This is a popup-type window. " + _
"You can drag it around with the left mouse button. " + _
"This works even if it is covered by a statictext control. " + _
"Press Alt+F4 to exit."
Open "WMLiberty" For DLL As #wmlib
' Get the handle of the window.
hWnd = HWnd(#pop)
' Get the pointer to the function that handles the event.
Callback lpfn, OnLButtonDown ( ULong, ULong, ULong, ULong ), Long
' Set up the handler for the "left button down" event.
' The "success" parameter is "1" so that the handler
' function won't interfere with the message's default
' processing by returning the (default) value of zero.
CallDLL #wmlib, "SetWMHandler", _
hWnd As ULong, _
_WM_LBUTTONDOWN As ULong, _
lpfn As ULong, _
1 As Long, _
ret As Long
Call DoEvents
Sub DoEvents
' WMLiberty requires a Scan loop.
[Loop]
Scan
CallDLL #kernel32, "Sleep", _
50 As Long, _
ret As void
GoTo [Loop]
End Sub
Sub Quit Me$
' WMLiberty requires windows to be closed before it is.
Close #Me$
Close #wmlib
End
End Sub
' _WM_LBUTTONDOWN event handler.
Function OnLButtonDown ( hWnd, uMsg, wParam, lParam )
' Release mouse's capture of the window.
CallDLL #user32, "ReleaseCapture", _
ret As void
' Tell the window its caption is being dragged. It's all
' a big lie, but then the window doesn't know any better.
CallDLL #user32, "SendMessageA", _
hWnd As ULong, _
_WM_NCLBUTTONDOWN As ULong, _
_HTCAPTION As Long, _
0 As Long, _
ret As Long
End Function |
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