Adding a drop arrow to a toolbar button

.
If you are interested in more articles written by Kirk Stowell, you can click here to visit his home page.

If you wanted to add a drop menu like the ones seen in internet explorer, it is pretty straight forward. This approach for will work for both Visual C++ 5 and 6, however you may want to read up on the enhancements to the toolbar class for VC 6.0.

First off, after your toolbar has been created in CMainFrame::OnCreate(), you will need to make a call to the following method:


	m_wndToolBar.GetToolBarCtrl().SetExtendedStyle(TBSTYLE_EX_DRAWDDARROWS);

This will enable your toolbar to handle drop arrows. The next thing you will need to do, is to actually add the drop arrow to your desired button. This will be done via the SetButtonStyle() method:


	DWORD dwStyle = m_wndToolBar.GetButtonStyle(m_wndToolBar.CommandToIndex(ID_FILE_OPEN));
	dwStyle |= TBSTYLE_DROPDOWN;
	m_wndToolBar.SetButtonStyle(m_wndToolBar.CommandToIndex(ID_FILE_OPEN), dwStyle);

Now, you will need to add a message handler for the drop arrow, as well a menu to the application resources. Assuming you already know how to create a menu, ( if not, click on the resource tab, select the resource name ie: MyApp Resources, then right click. Select insert, then select Menu, then press the New button ) and assuming that the resource id for our menu is IDR_MENU1, add the following code to CMainFrame's message map:


BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWnd)
	//{{AFX_MSG_MAP(CMainFrame)
	...
	ON_NOTIFY(TBN_DROPDOWN, AFX_IDW_TOOLBAR, OnToolbarDropDown)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

Add the following method to CMainFrame's .cpp file:


void CMainFrame::OnToolbarDropDown(NMTOOLBAR* pnmtb, LRESULT *plr)
{
	CWnd *pWnd;
	UINT nID;

	// Switch on button command id's.
	switch (pnmtb->iItem)
	{
	case ID_FILE_OPEN:
		pWnd = &m_wndToolBar;
		nID  = IDR_MENU1;
		break;
	default:
		return;
	}
	
	// load and display popup menu
	CMenu menu;
	menu.LoadMenu(nID);
	CMenu* pPopup = menu.GetSubMenu(0);
	ASSERT(pPopup);
	
	CRect rc;
	pWnd->SendMessage(TB_GETRECT, pnmtb->iItem, (LPARAM)&rc);
	pWnd->ClientToScreen(&rc);
	
	pPopup->TrackPopupMenu( TPM_LEFTALIGN | TPM_LEFTBUTTON | TPM_VERTICAL,
		rc.left, rc.bottom, this, &rc);
}

Then add the following to CMainFrame's .h file:


	//{{AFX_MSG(CMainFrame)
	...
	afx_msg void OnToolbarDropDown(NMTOOLBAR* pnmh, LRESULT* plRes);
	//}}AFX_MSG

Download demo project - (28 KB)

Last updated December 21, 1998



Comments

  • There are no comments yet. Be the first to comment!

  • You must have javascript enabled in order to post comments.

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: March 19, 2015 @ 1:00 p.m. ET / 10:00 a.m. PT The 2015 Enterprise Mobile Application Survey asked 250 mobility professionals what their biggest mobile challenges are, how many employees they are equipping with mobile apps, and their methods for driving value with mobility. Join Dan Woods, Editor and CTO of CITO Research, and Alan Murray, SVP of Products at Apperian, as they break down the results of this survey and discuss how enterprises are using mobile application management and private …

  • On-demand Event Event Date: February 12, 2015 The evolution of systems engineering with the SysML modeling language has resulted in improved requirements specification, better architectural definition, and better hand-off to downstream engineering. Agile methods have proven successful in the software domain, but how can these methods be applied to systems engineering? Check out this webcast and join Bruce Powel Douglass, author of Real-Time Agility, as he discusses how agile methods have had a tremendous …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date