Description of CTabView

Written by Gerry High
74750,2456 CIS

Revision History
Version	Date
1.2 	4/13/94
	Added Vertical tabs (left, right).  Some work was done by Douglas Brown
	Allow runtime setting of tab margins, height, style.
	Modified ALT+mnemonic view switching to not require accelerator definitions.
	Changed "toupper" to "AnsiUpper".
	Changed hardcoded RGB values to use GetSysColor.
	Fixed bug with OnMouseActivate.

Version	Date
1.1	3/16/94
	Removed extra frame in each view.
	Added code for ALT+Mnemonic view switching.
	Added suggestions from various people in the forum.
	Added MS Word 6.0 look to tabs (compliments of David Hollifield).

Version	Date
1.0	2/15/94 Initial posting
						
Description
This is a sample application using the CTabView class.  Expand the zip file
using the -d option and use VC++ to build the project.  The project uses the DLL version of MFC (mfc250d.dll) which should be in your windows\system directory.

To use the CTabView class in your own projects do the following:

1.  Subclass CTabView with the class you wish to manage your tabs (e.g. 
     CMainView : public CTabView ...  You should provide an "OnInitialUpdate" member
     method.
2.  Add tabview.cpp and your subclass of CTabView to your project.
3.  Modify the application class to use your view class.  Modify the include file name to be your
     view.h.  Modify your document template to specify the new view (e.g.)
    
	AddDocTemplate(new CMultiDocTemplate(IDR_TABTYPE,
		RUNTIME_CLASS(CTabDoc),
		RUNTIME_CLASS(CMDIChildWnd),	// standard MDI child frame
		RUNTIME_CLASS(CMainView)));	// your view goes here
			
4.  In your  OnInitialUpdate method add your views to the CTabView class using the method     
     "addTabView"

	addTabView(RUNTIME_CLASS(COrderView),GetDocument(),"&Options",this,);
	addTabView(RUNTIME_CLASS(CDrawView),GetDocument(),"&Graphics",this,
			TRUE,FALSE);

     Finally, call the CTabView "OnInitialUpdate" method from your OnInitialUpdate method.

		CTabView::OnInitialUpdate();

     An example from mainview.cpp is shown below:

	void CMainView::OnInitialUpdate()
	{
		COrderView* pOrderView = (COrderView*) 		
			addTabView(RUNTIME_CLASS(COrderView),GetDocument(),
				"&Options");
		ASSERT(pOrderView != NULL);
		pOrderView->m_pTabView = this;

		CDrawView* pDrawView = (CDrawView*) 	
			addTabView(RUNTIME_CLASS(CDrawView),GetDocument(),
			"&Graphics",TRUE,FALSE);
		ASSERT(pDrawView != NULL);
		pDrawView->m_pTabView = this;

		CEditVw* pEditView = (CEditVw*) 	
			addTabView(RUNTIME_CLASS(CEditVw),GetDocument(),
			"&Edit",TRUE,FALSE);
		ASSERT(pEditView != NULL);
		pEditView->m_pTabView = this;

		CTabView:OnInitialUpdate();
	}

     This example creates three tabs (Options, Graphics, and Edit).  The last thing done in the 
     OnInitialUpdate method is to call the base class OnInitialUpdate method.

5.  If you override the OnDraw method of CTabView you must call the CTabView::OnDraw 
     method as well.
6.  If you override the OnSize method of CTabView you must call the CTabView::OnSize 
     method as well.

Known Problems/Limitations
1.  A disabled tab currently uses the system color COLOR_GRAYTEXT; this may not yield a color that will work for all color schemes and result in the text being invisible.  In the future I will fix this to use the GrayString function.
2.  The Chicago look is only implemented for the TABSONTOP orientation.
3.  For vertical orientations the underline is not drawn for the tab mnemonic.  The reason for this is that TextOut doesn't support automatic underlining.

Disclaimer, etc.
Any questions, problems, suggestions, etc. should be directed to the author Gerry High 74750,2456 CIS.  Feel free to use this in your own programs.  This class is freeware and is provided as is.  In the near future I may update this class to support multi-row tabs and dialog support.  Other possibilities include tear-off tabs and owner draw tabs.  




Class Reference

class CTabView : public CView

______________________________________________________________
CTabView::addTabView

		virtual CView* 	addTabView(CRuntimeClass* pViewClass,
			CDocument* pDoc, char* tabLabel, BOOL border = FALSE,
			BOOL show = TRUE, int tabWidth = 100);

		pViewClass	Pointer to CRuntimeClass of child view.
		pDoc		Pointer to document.
		pTabLabel	Pointer to the string for the tab label.
		border		Requests whether a border is to be drawn around the view.
		show		Requests whether to view is to be shown.
		tabWidth	Specifies the width of the tab in pixels.

Remarks	Call this function to add a tab.

______________________________________________________________
CTabView::doSysCommand

		void doSysCommand(UINT nID, long lParam);

Remarks	Call this function from an OnSysCommand handler to pass "ALT-mnemonic" 
		keys through from the child view for view switching.

Example	void CDrawView::OnSysCommand(UINT nID, long lParam)
		{
			if(m_pTabView->doSysCommand(nChar,lParam))
				return;
			CScrollView::OnSysCommand(nChar,lParam);
		}

______________________________________________________________
CTabView::enableView

		void enableView(int index, BOOL bEnable = TRUE);

		index		Specifies the zero based index of the tab to be enable or 
				disabled.
		bEnable	Specifies whether the given tab is to be enabled or disabled.

Remarks	Call this function to enable or disable a tab.

Example	enableView(1, FALSE); //disable tab 1

______________________________________________________________
CTabView::setFrameBorderOn

		void setFrameBorderOn(BOOL bOn = TRUE);

		bOn	Specifies whether the frame border is to be drawn.

Remarks	Call this function to turn on or off the tab frame.

______________________________________________________________
CTabView::setLAF

		void setLAF(eLookAndFeel LAF);

		LAF	Is a enum of type eLookAndFeel.  Must be either LAF_MSWORD or
			LAF_CHICAGO.

Remarks	Call this function to set the look and feel to either Chicago or MS Word.

______________________________________________________________
CTabView::setMargin

		void setMargin(int margin);

		margin		The margin width in pixels.

Remarks	Call this function to set the margin around the tab frame.

______________________________________________________________
CTabView::setTabHeight

		void setTabHeight(int height);

		height		The tab height in pixels.

Remarks	Call this function to set the height of the tabs.

______________________________________________________________
CTabView::setTabPosition

		void setTabPosition(eTabPosition tabPosition);

		tabPosition	Specifies the position of the tabs.  Must be one of
				TABSONTOP, TABSONLEFT, TABSONLEFTBOT, 						TABSONRIGHT,  TABSONRIGHTBOT, or TABSONBOTTOM.

Remarks	Call this function to set the postiton of the tabs.

______________________________________________________________
CTabView::switchTab

		void switchTab(int viewIndex);

		viewIndex	Specifies the zero-based index of the tab to be switched to.

Remarks	Call this function to switch between different tabs.