formctrl.cpp

Visual C++ 实践与提高COM和COM+篇源代码. 对学习COM编程很有帮助.

/*****************************************************************************
  File: FormControl.cpp

  Purpose:
     Implement the CFormControl class from which the Form OLE Controls can be
	 derived. The primary purpose of this class is to create the controls
	 window using CWnd::CreateDlg. Also provided is a default design time
	 representation of the control, a means of forcing the control to the 
	 size of the dialog template, and code to handle mouse and keyboard
	 processing.

  Includes:
     #include "FormControl.h"
     #include "Wnd2.h"
     #include "AfxPriv.h"
     #include "AfxImpl.h"
     #include "CtlImpl.h"
     #include "OccImpl.h"

  Functions:
     CFormControl        - Initialize member variables and calculate the dialog
	                       template size.
     OnSetExtent         - Sets the size of the control.
     OnInitialUpdate     - Handles the child control initialization.
     OnDraw              - Provides a border at design time.
     PreTranslateMessage - If m_hWnd is valid, allows IsDialogMessage to 
	                       to try and handle the message.
     OnActivateControl   - Handler to be executed when a child window gets the
	                       focus.
     OnSetFocus          - Handles the case when tabbing into the OLE Form Control.
     CreateControlWindow - Creates m_hWnd using CWnd::CreateDlg

     SetOccDialogInfo    - Copied from CFormView.
     HandleInitDialog    - Copied from CFormView

     GetClassID          - Had to override COleControl pure virtual function.
     GetUserTypeNameID   - Had to override COleControl pure virtual function.
     GetMiscStatus       - Had to override COleControl pure virtual function.
     
     OnMouseActivate     - To make the OLE control layer transparent mouse 
     OnMouseMove         - messages should come through the child controls. 
     OnLButtonDblClk     - These functions have empty implementations so as 
     OnLButtonDown       - to turn off the default mouse message processing 
     OnLButtonUp         - of an OLE control.
     OnMButtonDblClk     - See Above.
     OnMButtonDown       - See Above.
     OnMButtonUp         - See Above.
     OnRButtonDblClk     - See Above.
     OnRButtonDown       - See Above.
     OnRButtonUp         - See Above.

  Other:
     _AfxCheckDialogTemplate - Global helper function copied from CFormView.

  Development Team: ShawnK

  Written by Microsoft Product Support Services, Languages Developer Support
  Copyright (c) 1993 Microsoft Corporation. All rights reserved.
\****************************************************************************/


#include "stdafx.h"
#include "FormCtrl.h"
#include "AfxPriv.h"
#include "AfxImpl.h"
#include "CtlImpl.h"
#include "OccImpl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

IMPLEMENT_DYNCREATE(CFormControl, COleControl)

//**************************************************************************
// Initialize member variables and calculate the dialog template size.
CFormControl::CFormControl(LPCTSTR lpszTemplateName, BOOL bAutoSize):
	m_bAutoSize(bAutoSize),
	m_lpszTemplateName(lpszTemplateName),
	m_hWndCurrentChild(NULL),
	m_cTemplateSize(0,0),
	m_sFormName("Form Control")
{
	// load dialog resource
	LPDLGTEMPLATE lpDialogTemplate = NULL;
	HGLOBAL hDialogTemplate = NULL;
	HINSTANCE hInst = AfxFindResourceHandle(m_lpszTemplateName, RT_DIALOG);
	HRSRC hResource = ::FindResource(hInst, m_lpszTemplateName, RT_DIALOG);
	hDialogTemplate = LoadResource(hInst, hResource);
	if (hDialogTemplate != NULL)
		lpDialogTemplate = (LPDLGTEMPLATE)LockResource(hDialogTemplate);
	ASSERT(lpDialogTemplate != NULL);

	// Get the dialog template size in pixels for OnSetExtent.
	CDialogTemplate cdt_Form(lpDialogTemplate);
	tagSIZE dlgSize;
	cdt_Form.GetSizeInPixels(&dlgSize);
	m_cTemplateSize.cx = dlgSize.cx; 
	m_cTemplateSize.cy = dlgSize.cy; 

	// free dialog resource
	UnlockResource(hDialogTemplate);
	FreeResource(hDialogTemplate);
}

//**************************************************************************
// Initialize member variables and calculate the dialog template size.
CFormControl::CFormControl(UINT nIDTemplate, BOOL bAutoSize):
	m_bAutoSize(bAutoSize),
	m_hWndCurrentChild(NULL),
	m_cTemplateSize(0,0),
	m_sFormName("Form Control")

{
	ASSERT_VALID_IDR(nIDTemplate);
	m_lpszTemplateName = MAKEINTRESOURCE(nIDTemplate);

	// load dialog resource
	LPDLGTEMPLATE lpDialogTemplate = NULL;
	HGLOBAL hDialogTemplate = NULL;
	HINSTANCE hInst = AfxGetInstanceHandle();
	HRSRC hResource = ::FindResource(hInst, m_lpszTemplateName, RT_DIALOG);
	hDialogTemplate = LoadResource(hInst, hResource);
	if (hDialogTemplate != NULL)
		lpDialogTemplate = (LPDLGTEMPLATE)LockResource(hDialogTemplate);
	ASSERT(lpDialogTemplate != NULL);
	
	// Get the dialog template size in pixels for OnSetExtent.
	CDialogTemplate cdt_Form(lpDialogTemplate);
	tagSIZE dlgSize;
	cdt_Form.GetSizeInPixels(&dlgSize);
	m_cTemplateSize.cx = dlgSize.cx; 
	m_cTemplateSize.cy = dlgSize.cy; 

	// free dialog resource
	UnlockResource(hDialogTemplate);
	FreeResource(hDialogTemplate);
}

//**************************************************************************
CFormControl::~CFormControl()
{
}

//**************************************************************************
// Set the size of the control to the size of the dialog template it was 
// created from. This functionality can be turned off.
BOOL CFormControl::OnSetExtent( LPSIZEL lpSizeL )
{
	if (m_bAutoSize) {
	    // This function limits the height of a control to
		// to the size of the dialog template

	    // Use the desktop window to get a DC so we can use
		// CDC::HIMETRICtoDP and CDC::DPtoHIMETRIC
	    CWnd *pWnd = CWnd::FromHandle(::GetDesktopWindow());
		CClientDC dc(pWnd);

	    CSize sz(m_cTemplateSize.cx,m_cTemplateSize.cy);
		dc.DPtoHIMETRIC(&sz);//re-convert to HIMETRIC
		lpSizeL->cx = sz.cx;
		lpSizeL->cy = sz.cy;
	}
		
	return COleControl::OnSetExtent(lpSizeL);
}

//**************************************************************************
// Modify CreateControlWindow to create m_hWnd using CreateDlg. This will
// create the window using the dialog resource parameter in the constructor.
BOOL CFormControl::CreateControlWindow(HWND hWndParent, const CRect& rcPos,
	LPCRECT prcClipped)
{
	ASSERT(hWndParent != NULL);
	ASSERT(m_lpszTemplateName != NULL);

	// If m_hWnd is NULL then call OnInitialUpdate.
	BOOL bInitialUpdate = (m_hWnd == NULL);

	if (prcClipped == NULL)
		prcClipped = &rcPos;

	if (m_hWnd == NULL)
	{
		// If window doesn't exist, create it.

		// Test if:
		// we're not subclassing a Windows control, or
		// container reflects messages for us...
		// we create normally if:
		//       (we're not subclassing -or- the container reflects)
		// -and- the container autoclips for us
		if ((!IsSubclassedControl() || m_bMsgReflect) && m_bAutoClip)
		{
			// Just create the control's window.
#ifdef _DEBUG
			// dialog template must exist and be invisible with WS_CHILD set
			if (!_AfxCheckDialogTemplate(m_lpszTemplateName, TRUE))
			{
				ASSERT(FALSE);          // invalid dialog template name
				PostNcDestroy();        // cleanup if Create fails too soon
				return FALSE;
			}
#endif //_DEBUG

#ifdef _MAC
			HINSTANCE hInst = AfxFindResourceHandle(m_lpszTemplateName, RT_DIALOG);
			_AfxStripDialogCaption(hInst, m_lpszTemplateName);
#endif

			// initialize common controls
			if (AfxDeferRegisterClass(AFX_WNDOLECONTROL_REG))
			{
				// create a modeless dialog window.
				CWnd* pParent = CWnd:: FromHandle(hWndParent);

				if (!CreateDlg(m_lpszTemplateName, pParent))
					return FALSE;
				if (m_hWnd != NULL) {
					MoveWindow (rcPos, TRUE);
					::ShowWindow(hWndParent, SW_SHOW);
					::ShowWindow(m_hWnd, SW_SHOW);
					SetFocus();
				}
			}
		}
		else    // ...we're subclassing a Windows control.
		{
			if (m_pReflect == NULL)
			{
				// Create a window to reflect notification messages.
				m_pReflect = new CReflectorWnd;
				if (!m_pReflect->Create(prcClipped, hWndParent))
				{
					// If m_pReflect->Create failed, then m_pReflect deleted itself.
					m_pReflect = NULL;
				}
			}
			else
			{
				// Reflector window already exists... just reparent it.
				if (m_pReflect->m_hWnd != NULL)
				{
					::SetParent(m_pReflect->m_hWnd, hWndParent);
					::SetWindowPos(m_pReflect->m_hWnd, NULL, 0, 0, 0, 0,
						SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|
						SWP_SHOWWINDOW);
				}
			}

			if (m_pReflect != NULL && m_pReflect->m_hWnd != NULL)
			{
#ifdef _DEBUG
				// dialog template must exist and be invisible with WS_CHILD set
				if (!_AfxCheckDialogTemplate(m_lpszTemplateName, TRUE))
				{
					ASSERT(FALSE);          // invalid dialog template name
					PostNcDestroy();        // cleanup if Create fails too soon
					return FALSE;
				}
#endif //_DEBUG

#ifdef _MAC
				HINSTANCE hInst = AfxFindResourceHandle(m_lpszTemplateName, RT_DIALOG);
				_AfxStripDialogCaption(hInst, m_lpszTemplateName);
#endif

				// Create the control's window.
				CreateDlg(m_lpszTemplateName, m_pReflect);
				if (m_hWnd == NULL)
				{
					// Window creation failed: cleanup.
					m_pReflect->DestroyWindow();
					m_pReflect = NULL;
				}else{
					// Make both windows visible.
					m_pReflect->ShowWindow(SW_SHOW);
					MoveWindow (rcPos, TRUE);
					::ShowWindow(m_hWnd, SW_SHOW);
					SetFocus();
				}
			}
		}

		// Set the new window's font.
		OnFontChanged();
	}
	else
	{
		// If window does exist, reparent and reposition it.
		CWnd* pWndOuter = GetOuterWindow();
		ASSERT(pWndOuter != NULL);

		if (::GetParent(pWndOuter->m_hWnd) != hWndParent)
			ReparentControlWindow(pWndOuter->m_hWnd, hWndParent);

		::SetWindowPos(pWndOuter->m_hWnd, NULL, 0, 0, 0, 0,
			SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|
			SWP_SHOWWINDOW);

		if (m_pReflect == NULL)
			::MoveWindow(m_hWnd, rcPos.left, rcPos.top,
				rcPos.Width(), rcPos.Height(), TRUE);
		else
		{
			pWndOuter->MoveWindow(prcClipped, TRUE);
			::MoveWindow(m_hWnd, m_ptOffset.x, m_ptOffset.y,
				rcPos.Width(), rcPos.Height(), TRUE);
		}
	}

	ASSERT(m_hWnd != NULL);
	
	// Send message to overridable OnInitialUpdate.
	if (bInitialUpdate) {
		InitControlContainer();
		UpdateData(FALSE);
		PostMessage(WM_INITIALUPDATE, 0, 0);
	}

	return (m_hWnd != NULL);
}

//**************************************************************************
// Diagnostic routine to check for and decode dialog templates returns FALSE 
// if a program error occurs (i.e. bad resource ID or bad dialog styles). 
// Copied from MFC.
BOOL AFXAPI _AfxCheckDialogTemplate(LPCTSTR lpszResource, BOOL bInvisibleChild)