How does a button implement two functions

[Kevin]

put together from this topic
http://www.quickmacros.com/forum/showthr...12#pid7112

left click button closes dialog and left click and drag  button moves dialog

Code:

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str dd=
;BEGIN DIALOG
;0 "" 0x90000A40 0x0 0 0 398 210 "Dialog"
;3 Button 0x54032000 0x0 368 0 30 14 "Close"
;END DIALOG
;DIALOG EDITOR: "" 0x2040700 "*" "" "" ""

if(!ShowDialog(dd &sub.DlgProc 0)) ret


#sub DlgProc
function# hDlg message wParam lParam

sel message
,case WM_INITDIALOG
,sub.DialogDragSubclassControl id(3 hDlg) ;;subclass button 3    
,case WM_DESTROY
,case WM_COMMAND goto messages2
ret
;messages2
sel wParam
,case IDOK
,case IDCANCEL
,case 3 ;;Close
,DT_Ok hDlg
ret 1

#sub DialogDragSubclassControl
function hwndctrl [modifiers] ;;modifiers: 1 Shift, 2 Ctrl, 4 Alt, 8 Win

;Use this function to subclass a control to enable dialog moving.
;Call it eg under WM_INITDIALOG.


SetProp hwndctrl "qm_wndproc" SubclassWindow(hwndctrl &sub.DialogDragSubclassProc)
SetProp hwndctrl "qm_modifiers" modifiers
#sub DragDialog
function# hDlg message [modifiers] ;;modifiers: 1 Shift, 2 Ctrl, 4 Alt, 8 Win

;Moves the dialog when the user presses left mouse button on the client area and drags.
;Returns 1 if suscessful, 0 if not (then the message should be passed to the default window procedure).
;The dialog must be a smart dialog, ie with dialog procedure.
;Call this function from the dialog procedure as shown below:

,;case [WM_LBUTTONDOWN,WM_LBUTTONUP,WM_MOUSEMOVE,WM_CANCELMODE] DragDialog hDlg message

;To enable moving the dialog by dragging a control, call DialogDragSubclassControl on WM_INITDIALOG.
;If the control has scroll bars, use Ctrl or other modifier key to scroll.


;dll user32 #DragDetect hwnd POINT'pt

POINT-- pp_drag
POINT p
RECT r
int-- t_indrag

sel message
,case WM_LBUTTONDOWN
,t_indrag=0
,if(GetMod!=modifiers) ret
,if(GetWinStyle(hDlg)&WS_CHILD) ;;need to detect drag, or the control will not respond to clicks
,,xm p
,,if(!DragDetect(hDlg p))
,,,ScreenToClient hDlg &p
,,,PostMessage hDlg WM_LBUTTONUP 0 p.y<<16|p.x
,,,ret
,xm pp_drag
,SetCapture hDlg
,t_indrag=1
,
,case [WM_LBUTTONUP,WM_CANCELMODE]
,if(!t_indrag or GetCapture!=hDlg) ret
,ReleaseCapture
,t_indrag=0
,
,case WM_MOUSEMOVE
,if(!t_indrag or GetCapture!=hDlg) ret
,hDlg=GetAncestor(hDlg 2) ;;in case hDlg is a subclassed control
,GetWindowRect hDlg &r
,xm p
,mov r.left+p.x-pp_drag.x r.top+p.y-pp_drag.y hDlg
,pp_drag=p

ret 1
#sub DialogDragSubclassProc
function# hWnd message wParam lParam

;Used internally in case a control is subclassed. Don't call explicitly.


sel message
,case [WM_LBUTTONDOWN,WM_LBUTTONUP,WM_MOUSEMOVE,WM_CANCELMODE]
,if(sub.DragDialog(hWnd message GetProp(hWnd "qm_modifiers"))) ret

int wndproc=GetProp(hWnd "qm_wndproc"); if(!wndproc) ret
int r=CallWindowProc(wndproc hWnd message wParam lParam)

if(message=WM_NCDESTROY)
,RemoveProp(hWnd "qm_wndproc")
,RemoveProp(hWnd "qm_modifiers")

ret r