This article was previously published under Q141871
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Note Microsoft Visual C++ .NET 2002 and Microsoft Visual C++ .NET 2003 support both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.
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By default, ActiveX controls do not support ToolTips. The
following steps, however, demonstrate how to modify a basic ActiveX control
generated using the MFC ActiveX Control Wizard to add this support:
Create a new Visual C++ project by using the MFC ActiveX
Control template. Name the new control Basic.
Open the Stdafx.h file associated with the project and add
the following line.
Do not perform this step in Visual C++ .NET.
The header file Afxcmn.h contains declarations for MFC classes that
serve as wrappers to Windows Common Controls including CToolTipCtrl.
Add the following lines to COleControl-derived class
CBasicCtrl located in BasicCtrl.h.
The RelayEvent method will be used by the mouse message handlers to
relay those messages to the ToolTip control.
Add a WM_CREATE message handler to the CBasicCtrl message
map. To do this, click to select CBasicCtrl in the Class View window. With the
CBasicCtrl node selected, open the Properties window, and then click to select
Messages. Find the WM_CREATE message, and then add an OnCreate method to handle
the message. It is in this routine that the ToolTip control will be created.
Add the following code to this handler.
TRACE0("Unable to create tip window.");
if (!m_ttip.AddTool(this, LPCTSTR(m_ToolTipText)))
TRACE0("Unable to add tip for the control window.");
To relay appropriate messages to the ToolTip control, add
handlers for WM_LBUTTONDOWN, WM_LBUTTONUP, and WM_MOUSEMOVE to the CBasicCtrl
message map. The code for these handlers follows.
While it might seem reasonable to call CWnd::GetCurrentMessage instead
of manually building a message, the value of the point that is returned is
expressed in screen coordinates. When the ToolTip performs a hit test to
determine if the point of the relayed message falls within the boundary of the
client rectangle of any associated tools, the test will fail, and the ToolTip
will not be displayed.
Alter CBasicCtrl::DoPropExchange by adding code to
initialize the m_ToolTipText and m_ShowToolTip properties.
PX_Bool(pPX, _T("ShowToolTip"), (BOOL&)m_ShowToolTip, FALSE);In order to view tooltip, this must be true.
PX_String(pPX, _T("ToolTipText"), m_ToolTipText, _T("")); And we need to add some text in _T(“ ...”)
To allow the user of the control some control over the
ToolTip functionality, add the following Automation properties to the
CBasicCtrl class. To do this, in the Class View window, select BasicLib (this
node displays class view information about the project IDL file). Open this
node and right-click the primary Interface node (_DBasic). Click Add, and then
click Add Property. Add the following two properties with the listed