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

  • Today's agile organizations pose operations teams with a tremendous challenge: to deploy new releases to production immediately after development and testing is completed. To ensure that applications are deployed successfully, an automatic and transparent process is required. We refer to this process as Zero Touch Deployment™. This white paper reviews two approaches to Zero Touch Deployment--a script-based solution and a release automation platform. The article discusses how each can solve the key …

  • Learn How A Global Entertainment Company Saw a 448% ROI Every business today uses software to manage systems, deliver products, and empower employees to do their jobs. But software inevitably breaks, and when it does, businesses lose money -- in the form of dissatisfied customers, missed SLAs or lost productivity. PagerDuty, an operations performance platform, solves this problem by helping operations engineers and developers more effectively manage and resolve incidents across a company's global operations. …

Most Popular Programming Stories

More for Developers

RSS Feeds