Using Drop-Down Buttons in a Toolbar Control
In addition to standard push buttons, a toolbar can also have drop-down buttons. A drop-down button is usually indicated by the presence of an attached down arrow.
Note The attached down arrow will appear only if the TBSTYLE_EX_DRAWDARROWS extended style has been set.
When the user clicks on this arrow (or the button itself, if no arrow is present), a TBN_DROPDOWN notification message is sent to the parent of the toolbar control. You can then handle this notification and display a popup menu; similar to the behavior of Internet Explorer.
The following procedure illustrates how to implement a drop-down toolbar button with a popup menu:
To implement a drop-down button
Once your CToolBarCtrl object has been created, set the TBSTYLE_EX_DRAWDDARROWS style, using the following code:
m_wndToolBar.GetToolBarCtrl().SetExtendedStyle(TBSTYLE_EX_DRAWDDARROWS);Set the TBSTYLE_DROPDOWN style for any new ( or ) or existing () buttons that will be drop-down buttons. The following example demonstrates modifying an existing button in a CToolBarCtrl object:
TBBUTTONINFO tbi; tbi.dwMask= TBIF_STYLE; tbi.cbSize= sizeof(TBBUTTONINFO); m_wndToolBar.GetToolBarCtrl().GetButtonInfo(ID_EDIT_CUT, &tbi); tbi.fsStyle |= TBSTYLE_DROPDOWN; m_wndToolBar.GetToolBarCtrl().SetButtonInfo(ID_EDIT_CUT, &tbi);Add a WM_NOTIFY handler to the parent class of the toolbar object.
In the new handler, check for the TBN_DROPDOWN notification, using the following code:
#define lpnm ((LPNMHDR)lParam) #define lpnmTB ((LPNMTOOLBAR)lParam) switch(lpnm->code) { case TBN_DROPDOWN: //drop down button was hit //handle appropriately . . . return FALSE; //indicates the TBN_DROPDOWN //notification was handled. }If the TBN_DROPDOWN notification has been sent, display the appropriate popup menu. The following code demonstrates one method:
CMenu menu; VERIFY(menu.LoadMenu(IDR_MENU1)); CMenu* pPopup = menu.GetSubMenu(0); ASSERT(pPopup != NULL); pPopup->TrackPopupMenu(TPM_RIGHTALIGN | TPM_RIGHTBUTTON, x, y, this);