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Force positioning of text cursor by right mouse click in EditBox and RTF ActiveX controls
Vlad Grynchyshyn, February 8, 2002
There is a situation often when we need some way to position a text cursor in the text of Editbox or RTF ActiveX controlwhen right click on the control. For example, we want to display a shortcut menu on right click. In menu, user select an option that insert some text into the control on place of c...
Summary
There is a situation often when we need some way to position a text cursor in the text of Editbox or RTF ActiveX controlwhen right click on the control. For example, we want to display a shortcut menu on right click. In menu, user select an option that insert some text into the control on place of current position. However, right click on the control does not change the text cursor position, that confuse users. It would be good to right click, cursor moves to the clicked point and then menu displayed. After selecting the menu option additional text is inserted on the place where mouse is right-clicked. Here is a code to do this for edit box and RTF control.
Description
Because there are no functionality in VFP to position text cursor by mouse coordinates (as if we clicked on some place), we will simulate a click by mouse on the control by left mouse button to force text cursor positioning. For EditBox it is very simple - we can use MOUSE command:
* MouseDown event of the EditBox
LPARAMETERS nButton, nShift, nXCoord, nYCoord

if m.nButton<>1
    MOUSE CLICK AT (MROW("",3)), (MCOL("",3)) PIXELS LEFT
endif
Events sequence is correct as for right click - any text inserted into edit box in RightClick event will be inserted correctly on place of right-clicking. For RTF control it is more complex. MOUSE command works for VFP controls only. So we will use API functions to force mouse click events for RTF control.
*** ActiveX Control Event ***
LPARAMETERS nButton, nShift, nXCoord, nYCoord

if m.nButton=2
* below code transforms any mouse clicks to left-button mouse clicks
* to automatically position text cursor on place of click for 
* mouse button, not only for left button as in RTF control.


	local lcPointStructure
	local lnFormHandle, lnTopParentHandle, lnHandle
	local lnPressedKeys
	local lnButtonDown, lnButtonUp, lnMKButton
	local lnWM_MOUSEACTIVATE, lnWM_SETCURSOR, lnWM_MOUSEMOVE, ;
			lnWM_LBUTTONDOWN, lnWM_RBUTTONDOWN, lnWM_MBUTTONDOWN, ;
			lnWM_LBUTTONUP, lnWM_RBUTTONUP, lnWM_MBUTTONUP, ;
			lnHTCLIENT, lnMK_LBUTTON, lnMK_RBUTTON, ;
			lnMK_MBUTTON, lnMK_SHIFT, lnMK_CONTROL

	*-- Declare Win32 API functions
	declare integer SendMessage ;
		in Win32API ;
		as __SendMessage__ ;
			integer lnWindowHandle, ;
			integer lnMessage, ;
			integer lnWParam, ;
			integer lnLParam
	declare integer PostMessage ;
		in Win32API ;
		as __PostMessage__ ;
			integer lnWindowHandle, ;
			integer lnMessage, ;
			integer lnWParam, ;
			integer lnLParam
	declare integer GetDesktopWindow ;
		in Win32API ;
		as __GetDesktopWindow__


	lnFormHandle = this.hwnd && window handle for RTF ActiveX control

	* Get a handle to the desktop window
	lnTopParentHandle = __GetDesktopWindow__()

	* Declare constants used by mouse messages
	lnWM_MOUSEACTIVATE = 0x0021
	lnWM_SETCURSOR     = 0x0020
	lnWM_MOUSEMOVE     = 0x0200

	lnWM_LBUTTONDOWN   = 0x0201
	lnWM_RBUTTONDOWN   = 0x0204
	lnWM_MBUTTONDOWN   = 0x0207
	lnWM_LBUTTONUP     = 0x0202
	lnWM_RBUTTONUP     = 0x0205
	lnWM_MBUTTONUP     = 0x0208

	lnHTCLIENT         = 0x0001

	lnMK_LBUTTON       = 0x0001
	lnMK_RBUTTON       = 0x0002
	lnMK_MBUTTON       = 0x0010
	lnMK_SHIFT         = 0x0004
	lnMK_CONTROL       = 0x0008

	lnPressedKeys = 0
	if BitAnd(m.nShift, 1) = 1
		* The Shift key was pressed when
		*   mouse was clicked
		lnPressedKeys = BitOr(m.lnPressedKeys, m.lnMK_SHIFT)
	endif
	if BitAnd(m.nShift, 2) = 2
		*-- The Ctrl key was pressed when
		*   mouse was clicked
		lnPressedKeys = BitOr(m.lnPressedKeys, m.lnMK_CONTROL)
	endif

	lnButtonDown = m.lnWM_LBUTTONDOWN
	do case
		case m.nButton = 1
			*-- Left button
			lnButtonUp   = m.lnWM_LBUTTONUP
			lnMKButton   = m.lnMK_LBUTTON
		case m.nButton = 2
			*-- Right button
			lnButtonUp   = m.lnWM_RBUTTONUP
			lnMKButton   = m.lnMK_RBUTTON
		case nButton = 4
			*-- Middle button
			lnButtonUp   = m.lnWM_MBUTTONUP
			lnMKButton   = m.lnMK_MBUTTON
	endcase

	* Simulate a mouse up message(s)
	lnLParam = m.nYCoord* 256 * 256 + m.nXCoord
	= __SendMessage__( ;
			m.lnFormHandle, ;
			m.lnButtonUp, ;
			m.lnMKButton + m.lnPressedKeys, ;
			m.lnLParam)
	lnLParam = m.lnWM_MOUSEMOVE * 256 * 256 + m.lnHTCLIENT
	= __SendMessage__( ;
			m.lnFormHandle, ;
			m.lnWM_SETCURSOR, ;
			m.lnFormHandle, ;
			m.lnLParam)
	lnLParam = m.nYCoord* 256 * 256 + m.nXCoord
	= __PostMessage__( ;
			m.lnFormHandle, ;
			m.lnWM_MOUSEMOVE, ;
			m.lnPressedKeys, ;
			m.lnLParam)


	* Simulate a mouse down message(s) - always for left button click
	lnMKButton   = lnMK_LBUTTON

	lnLParam = m.lnButtonDown * 256 * 256 + m.lnHTCLIENT
	= __PostMessage__( ;
			m.lnFormHandle, ;
			m.lnWM_MOUSEACTIVATE, ;
			m.lnTopParentHandle, ;
			m.lnLParam)
	= __PostMessage__( ;
			m.lnFormHandle, ;
			m.lnWM_SETCURSOR, ;
			m.lnFormHandle, ;
			m.lnLParam)
	lnLParam = m.nYCoord* 256 * 256 + m.nXCoord
	= __PostMessage__( ;
			m.lnFormHandle, ;
			m.lnButtonDown, ;
			m.lnMKButton, ;
			m.lnLParam)

	DOEVENTS && will not slow down VFP6 here because mouse events are in buffer


* Put a code for right click event HERE, because there are no 
* separate RightClick event in RTF control.

        * Insert some text to demo the behaviour
        this.SelText = "My Name is ..."

endif
Note that the code sample for this code was get from the Fancy Tool Tip control sources (File#487 by Paul Vlad Tatavu).
Vlad Grynchyshyn, Soft Serve
Vlad Grynchyshyn is senior developer and project manager at the Ukrainian company "Soft Serve Ltd.", that provides custom-developed software solutions in several areas with use of wide range of development tools and languages. Vlad works in the MS Solutions department of the company, and has experience working with many MS development tools, components, utilities and documentation. Most experience is related to Visual FoxPro, MS SQL Server, Visual Studio and Visual Basic. He is active member of Visual FoxPro and SQL Server community, author of several articles for Universal Thread WEB site and other VFP community forums. He was MS MVP 2001-2002. He has a MS MCP certificate in Visual FoxPro area.
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