Two or more views of a single document.
Hans Wedemeyer -- hansw@sprintmail.com
Tuesday, December 17, 1996
Environment: MSVC++ 4.2b, Win NT 4.0
Two or more views of a single document....
Trying to make the second view have the same attributes as the first
view.
Using the "TANGRAM" example and examples from my new found treasure,
"The Revolutionary Guide to MFC" by Mike Blaszczak, I ventured forth...
After many hours of stepping with the debugger, reading lots more "stuf"
I'm confused, why is the call that's made when the second view is
created ignored! ( see code fragments )
My call to CreateOrActivateFrame() seems correct, at least a view
appears!, but not the style I need. In this routine there's a call to
CreateNewFrame()and I tried giving it a pointer to the first view, as
the doucmentation implies
quote ...
"It provides a frame window on which to model the new frame window."
This does not seem to work either....
Finding out how MFC is used, is like swimming in syrup! I have read some
code that was written by a so called professional, and even with my
limited knowledge I know don't want to make the same mess that he
made... I guess I've started the " got to pay the due's" phase, and I'm
impatient to get going. My first attempt is now history.... after much
more reading I re-grouped and planned a new strategy, helped along with
Blaszczak's book.
Where am I going wrong ?
When will the changes to CREATESTRUCT be used, and why are they ignored?
Why are the first changes to CREATESTRUCT used and not the second ?
Even the AppWizard left behind a TODO: that implies this is where I
should be able to change the style...
// TODO: Modify the Window class or styles here by modifying
// the CREATESTRUCT cs
Any tips or pointers are welcome..
regards
Hans Wedemeyer
code fragments follow:-
BOOL CScan3App::InitInstance()
{
......
//pDocTemplate;
pDataTemplate = new CMultiDocTemplate(
IDR_SCAN3TYPE,
RUNTIME_CLASS(CScan3Doc),
RUNTIME_CLASS(CChildFrame),
RUNTIME_CLASS(CScan3View));
AddDocTemplate(pDataTemplate);
pScaleTemplate = new CMultiDocTemplate(
IDR_SCAN3TYPE2,
RUNTIME_CLASS(CScan3Doc),
RUNTIME_CLASS(CMDIChildWnd),
RUNTIME_CLASS(CScale3View));
AddDocTemplate(pScaleTemplate);
// create main MDI Frame window
CMainFrame* pMainFrame = new CMainFrame;
if (!pMainFrame->LoadFrame(IDR_MAINFRAME))
return FALSE;
m_pMainWnd = pMainFrame;
........
// now create and display the second view
pMainFrame->CreateOrActivateFrame(theApp.pScaleTemplate,
RUNTIME_CLASS(CScale3View));
}
////////////////////////////////////////////////////////////////////////
// In the default CChildFrame Class
// gets called THREE times !
BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
{
cs.y = 0; // hard coded values for test only
cs.x = 30;
cs.cx = 100;
cs.cy = 200;
cs.style = WS_CHILD | WS_VISIBLE | WS_THICKFRAME;
return CMDIChildWnd::PreCreateWindow(cs);
} // this changes the appearance and position of the FIRST window
////////////////////////////////////////////////////////////////////////
// In the new class for the second view CScale3View : CView
// Gets called ONCE ! has no effect! ie does not changes the style
// gets ignored !
BOOL CScale3View::PreCreateWindow(CREATESTRUCT& cs)
{
cs.y = 1;
cs.x = 1; // hard coded values for test only
cs.cx = 20;
cs.cy = 20;
cs.style = WS_CHILD | WS_VISIBLE ;
return CView::PreCreateWindow(cs);
} This has NO effect on the first Window gets ignored !
///////////////////////////////////////////////////////////////////////////
// CMainFrame Helper Functions
void CMainFrame::CreateOrActivateFrame(CDocTemplate* pTemplate,
CRuntimeClass* pViewClass)
{
CMDIChildWnd* pMDIActive = MDIGetActive();
ASSERT(pMDIActive != NULL);
CDocument* pDoc = pMDIActive->GetActiveDocument();
ASSERT(pDoc != NULL);
CView* pView;
POSITION pos = pDoc->GetFirstViewPosition();
while (pos)
{
pView = pDoc->GetNextView(pos);
if (pView->IsKindOf(pViewClass))
{
pView->GetParentFrame()->ActivateFrame();
return;
}
}
CMainFrame *pMainFrame = (CMainFrame *) AfxGetMainWnd();
CView* pVCur = pMainFrame->GetActiveView();
CMDIChildWnd* pNewFrame
= (CMDIChildWnd*)(pTemplate->CreateNewFrame( pDoc, pMDIActive
));
if (pNewFrame == NULL) ^
{ return; } // not created |
ASSERT(pNewFrame->IsKindOf(RUNTIME_CLASS(CMDIChildWnd))); |
pTemplate->InitialUpdateFrame(pNewFrame, pDoc); |
} |
// Make a copy of the first view ----------------------------
// does not work either !
ГЦ °ж ·Д -- listen@klnet.co.kr
Friday, January 24, 1997
Hans Wedemeyer wrote:
>
> Environment: MSVC++ 4.2b, Win NT 4.0
>
>.....
>
> BOOL CScan3App::InitInstance()
> {
> ......
> //pDocTemplate;
> pDataTemplate = new CMultiDocTemplate(
> IDR_SCAN3TYPE,
> RUNTIME_CLASS(CScan3Doc),
> RUNTIME_CLASS(CChildFrame),
> RUNTIME_CLASS(CScan3View));
> AddDocTemplate(pDataTemplate);
>
> pScaleTemplate = new CMultiDocTemplate(
> IDR_SCAN3TYPE2,
> RUNTIME_CLASS(CScan3Doc),
> RUNTIME_CLASS(CMDIChildWnd),
> RUNTIME_CLASS(CScale3View));
> AddDocTemplate(pScaleTemplate);
>
> // create main MDI Frame window
> CMainFrame* pMainFrame = new CMainFrame;
> if (!pMainFrame->LoadFrame(IDR_MAINFRAME))
> return FALSE;
> m_pMainWnd = pMainFrame;
> ........
>
> // now create and display the second view
> pMainFrame->CreateOrActivateFrame(theApp.pScaleTemplate,
> RUNTIME_CLASS(CScale3View));
> }
> ////////////////////////////////////////////////////////////////////////
> // In the default CChildFrame Class
> // gets called THREE times !
> BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
> {
> cs.y = 0; // hard coded values for test only
> cs.x = 30;
> cs.cx = 100;
> cs.cy = 200;
> cs.style = WS_CHILD | WS_VISIBLE | WS_THICKFRAME;
> return CMDIChildWnd::PreCreateWindow(cs);
> } // this changes the appearance and position of the FIRST window
>
> ////////////////////////////////////////////////////////////////////////
> // In the new class for the second view CScale3View : CView
> // Gets called ONCE ! has no effect! ie does not changes the style
> // gets ignored !
> BOOL CScale3View::PreCreateWindow(CREATESTRUCT& cs)
> {
> cs.y = 1;
> cs.x = 1; // hard coded values for test only
> cs.cx = 20;
> cs.cy = 20;
> cs.style = WS_CHILD | WS_VISIBLE ;
> return CView::PreCreateWindow(cs);
>
> } This has NO effect on the first Window gets ignored !
>
> ///////////////////////////////////////////////////////////////////////////
> // CMainFrame Helper Functions
> void CMainFrame::CreateOrActivateFrame(CDocTemplate* pTemplate,
> CRuntimeClass* pViewClass)
> {
> CMDIChildWnd* pMDIActive = MDIGetActive();
> ASSERT(pMDIActive != NULL);
> CDocument* pDoc = pMDIActive->GetActiveDocument();
> ASSERT(pDoc != NULL);
>
> CView* pView;
> POSITION pos = pDoc->GetFirstViewPosition();
> while (pos)
> {
> pView = pDoc->GetNextView(pos);
> if (pView->IsKindOf(pViewClass))
> {
> pView->GetParentFrame()->ActivateFrame();
> return;
> }
> }
> CMainFrame *pMainFrame = (CMainFrame *) AfxGetMainWnd();
> CView* pVCur = pMainFrame->GetActiveView();
>
> CMDIChildWnd* pNewFrame
> = (CMDIChildWnd*)(pTemplate->CreateNewFrame( pDoc, pMDIActive
> ));
> if (pNewFrame == NULL) ^
> { return; } // not created |
> ASSERT(pNewFrame->IsKindOf(RUNTIME_CLASS(CMDIChildWnd))); |
> pTemplate->InitialUpdateFrame(pNewFrame, pDoc); |
> } |
> // Make a copy of the first view ----------------------------
> // does not work either !
Hi! Hans.
Maybe it's too late.
However, I have met a problem like you.
I use 3 Views for one Document.
And I want 3 views can change frame size or style individually.
So I override PreCreateWindow() in ChildFrame and 3 Views.
But the PreCreateWindow() Function in 3 views doesn't work.
Only PreCreateWindow() Function in ChildFrame works.
When situation like those above the PreCreateWindow() Function
in 3 views doesn't called.
So I added code to OnInitialUpdate() in 3 views
like this:
CChildFrame* pwnd = (CChildFrame*)GetParentFrame();
pwnd->ModifyStyle(0,WS_MAXIMIZEBOX | WS_SIZEBOX);
GetClientRect(&clientRect);
And when I want to resize the Frame, set the clientRect with
proper size and use MoveWindow() Function.
try like this:
BOOL CScale3View::OnInitialUpdate()
{
CRect clientRect;
CChildFrame* pwnd = (CChildFrame*)GetParentFrame();
pwnd->ModifyStyle(0,WS_CHILD | WS_VISIBLE);
GetClientRect(&clientRect);
clientRect.SetRect(1,1,20,20);
MoveWindow(clientRect);
.....
}
;-)
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