C / C++ / MFC

Richard MacCutchan12-Mar-18 22:59

12-Mar-18 22:59

Why do you need multiple tabs in the first place? It sounds like you just want your view to render different data based on some external setting or user selection.

Sampath57912-Mar-18 23:04

12-Mar-18 23:04

I have some drawings to display.

For Eg: I have a drawing file which internally contains 5 sub drawings in it. So based on no. of sub drawings, i have to create 5 tabs. In each tab each sub drawing should get render. But user is allowed to view only one sub drawing at a time i.e., the active tab drawing. Thats the reason why i need to create tabs.

When i click on first tab, first sub drawing will be displayed. if second tab is selected then second sub drawing should be displayed. like wise rest of the drawing when user selects the tab.

Richard MacCutchan12-Mar-18 23:15

12-Mar-18 23:15

According to your original question your requirement is to have only a single View, so you do not need multiple tabs. You just need to render the appropriate drawing when the user makes a choice.

Sampath57912-Mar-18 23:17

12-Mar-18 23:17

Yes exactly. I need only one view. But the User interaction should be on tabs. To be more precise, i need the UI in the form of tabs but the view should be only one.

But when i call Addview(), each time a new view is getting created.

Richard MacCutchan12-Mar-18 23:32

12-Mar-18 23:32

Sampath579 wrote:
But when i call Addview(), each time a new view is getting created.

You need to show your code; it is difficult to guess what you are doing.

Sampath57912-Mar-18 23:44

12-Mar-18 23:44

class MyMainClass : public CTabView
{
    int OnCreate(LPCREATESTRUCT lpCreateStruct);
};

int MyMainClass::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CTabView::OnCreate(lpCreateStruct) == -1)
		return -1;

	
         AddView(RUNTIME_CLASS(CDrawingView), _T("Tab1"));
	 AddView(RUNTIME_CLASS(CDrawingView), _T("Tab2"));
}
	

class CDrawingView : public CScrollView
{
/.... rendering logic.
}

So, each time i call AddView() the CDrawingView class is getting instantiated and new view is getting created. Instead only one view should be available and new tabs should get created.

Richard MacCutchan12-Mar-18 23:53

12-Mar-18 23:53

The whole point of using AddView is to add a new View to the tab group. The documentation (CTabView::AddView[^])
makes it clear that it creates a new View for each call. If you want a single View then you will need to find an alternative to the CTabView control.

Sampath57912-Mar-18 23:59

12-Mar-18 23:59

Yes. I am looking into that feature and could not get any such behavior and posted it here.

Victor Nijegorodov13-Mar-18 1:25

13-Mar-18 1:25

Then don't call AddView!
Instead try to operate the CMFCTabCtrl class (or some of its base ones) to add/remove/change tabs and "on-change-tab" just display the only one view you have.

Sampath57913-Mar-18 6:14

13-Mar-18 6:14

ok. How can it solve my problem.

class MyMainClass : public CScrollView
{
   int OnCreate(LPCREATESTRUCT lpCreateStruct);
}

int MyMainClass::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CScrollView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	//CRect rect;
	//GetWindowRect(rect);
	if (!tab.Create(CMFCTabCtrl::STYLE_FLAT, CRect(0,0,100,100), this, 1))
	{
		TRACE0("Failed to create output tab window\n");
		return -1;      // fail to create
	}
	tab.AddTab(this, _T("tab1"),101);
	tab.AddTab(this, _T("tab1"),102);
	// TODO:  Add your specialized creation code here

	return 0;
}

Above piece of code created a tabcontrol with 2 tabs on it. But with out some view on this window how can i render some thing.

sorry if i miss anything to create view. Do i need to inherit my class from CMFCtabCtrl or is it ok even if i inherit from CScrollView?

Also when i select the second tab, my application is getting hanged. What could be the reason?

Edit 2:
I have gone through some examples and understood that, "this" in below call created issues.

tab.AddTab(this, _T("tab1"),101)

instead of this, we need to provide the control we are going to add to that tab control. For eg;
CEdit edit;
we need to give &edit instead of this. I saw this in microsoft samples.

This also does not solve my problem. In case if i have 3 tabs, then i need to create 3 CViews and add them to tabcontrol. Again this is like kind of creating new view for each tab.

But i want only one view and different tabs.

modified 13-Mar-18 13:32pm.

Victor Nijegorodov13-Mar-18 9:29

13-Mar-18 9:29

Sampath579 wrote:
I have gone through some examples and understood that, "this" in below call created issues.
tab.AddTab(this, _T("tab1"),101)
instead of this, we need to provide the control we are going to add to that tab control

Did you try to provide the same View for all created tabs?

Sampath57913-Mar-18 17:59

13-Mar-18 17:59

I tried with CEdit as per the example in msdn. But instead of CEdit i need CView. If i declare

CView m_windView; //throwing error since it contains virtual functions and we need to implement them.

Sampath57913-Mar-18 19:05

13-Mar-18 19:05

Which class should i take in order to display my drawings in the view. I tried with CView and CScrollView. Both the classes contains virtual functions and it showing error. I need a view where mouse down , mouse up, mouse wheel should work on it.

Any suggestions please.

Sampath57913-Mar-18 23:39

13-Mar-18 23:39

How to load a CView in tab which is created using CMFCTabCtrl.

Sampath57913-Mar-18 23:44

13-Mar-18 23:44

Then i created CMFCTabCtl and created a tab control. Next, how to add a CView to tabs? I saw samples like how to add a CEdit control to tab but dint get any clue on how to add CView to tabs?

If i can add a Cview to tabs then my problem would be solved. I can add same CView to all the tabs and finally i will end up with one view and mutliple tabs which is my requirement.

Sampath57914-Mar-18 3:51

14-Mar-18 3:51

Victor,

May i know how can know whether user selected different tabs? I mean my function should know when user selects different tabs, based on that i can refresh my single view. ?

Victor Nijegorodov14-Mar-18 10:26

How to change color of Tab View in MFC

14-Mar-18 10:26

Did you try to google for something like "CMFCTabCtrl handle tab change"?
Try!
Then you'll find this one: visual c++ - CMFCTabCtrl catch tab change event - Stack Overflow
and some more info!

Sampath57910-Mar-18 2:55

10-Mar-18 2:55

Hi.

In my MFC application, i created a class which is derived from CTabView and created few tabs(views) using AddView(). Now i want to change the color of the tab views. May i know how to change the background color of those views?

Thanks in Advance.

Victor Nijegorodov10-Mar-18 7:35

10-Mar-18 7:35

Do you want t change the color of the view (your CView derived class added using AddView)? Or the color of the tabview control itself?
if the former - see Paint back color of CScrollView derived class.
if the latter - see CMFCBaseTabCtrl::SetActiveTabTextColor, CMFCBaseTabCtrl Class

Sampath57910-Mar-18 18:17

10-Mar-18 18:17

I want the first one i.e., changing the background color of the CView. I tried with below call

SetClassLong(GetActiveView()->GetSafeHwnd(), 0, RGB(255, 0, 0)); but it dint work.

Victor Nijegorodov10-Mar-18 21:52

10-Mar-18 21:52

Sampath579 wrote:
I tried with below call

SetClassLong(GetActiveView()->GetSafeHwnd(), 0, RGB(255, 0, 0)); but it dint work.

And how should it "work"? Where did you find this strange code? Did you read the SetClassLong function (Windows) documentation in MSDN? Confused | :confused:

I posted you a link to the Forum where you can find a working code. Why did you ignore it? Confused | :confused:

Sampath57910-Mar-18 23:11

10-Mar-18 23:11

Thanks. Its working fine.

Victor Nijegorodov10-Mar-18 23:18

Why the arrow button on TabControl is not working in my MFC application.

10-Mar-18 23:18

Sampath57910-Mar-18 2:54