Make sure that the ListView is in LVS_REPORT if( (GetWindowLong(m_hWnd, GWL_STYLE) & LVS_TYPEMASK) != LVS_REPORT ) cellrect - to hold the bounding rect // col - to hold the column index int CMyListCtrl::CellRectFromPoint(CPoint & point, RECT * cellrect, int * col) const CellRectFromPoint - Determine the row, col and bounding rect of a cell // Returns - row index on success, -1 otherwise // point - point to be tested. In addition to determining the row and column over whichĪ point falls, this function also determines the bounding rectangle of This function is very similar to the HitTextEx() function covered in anĮarlier topic. We next define the CellRectFromPoint() function that is used by OnToolHitTest(). The notification sent from the automatically created tooltip on NT 4.0.Īs mentioned earlier, on NT 4.0, the list view control automatically createsĪ tooltip, and the id used by this tooltip is 0. We need a non zero id so that we can distinguish it from The reason for this is to make thisĪ non zero value. Row and column values will allow upto 4194303 rows and 1023 columns. The uId is assignedĪ value by combining the row and col values. The function then sets up the TOOLINFO structure. The row, column and the bounding rectangle of the cell. The function first calls the CellRectFromPoint() function to determine PTI->uId = (UINT)((rowlpszText = LPSTR_TEXTCALLBACK Row = CellRectFromPoint(point, &cellrect, &col ) int CMyListCtrl::OnToolHitTest(CPoint point, TOOLINFO * pTI) const Therefore, OnToolHitTest() should return a different value whenever theĬell at the given point changes. The framework updates the tooltip only when the tool changes, That, the framework uses the return value to determine if the tool hasĬhanged. The documentation of the OnToolHitTest() implies that you should returnġ if a tool is found and -1 if no tool was found. For our purpose, we would want theĪrea of each cell to be treated as a tool. A tool can be a control window or evenĪ rectangular area within a window. OnToolHitTest() is a virtual functionĭefined in CWnd class and is called by the framework to determine whetherĪ point is over any of the tools. EnableToolTips() is a member function of theĬWnd class and thus available to all windows and controls. Override PreSubclassWindow() and after calling the base class versionĬall EnableToolTips(TRUE). Notification whenever the mouse is over the list view control and does This built in tooltip control automatically sends the TTN_NEEDTEXTW Second, on NT 4.0, the list view control automatically creates a tooltipĬontrol. On NT 4.0, the controls are UNICODE controls. On Window 95, all strings passed to a control Windows 95 the actual message would be TTN_NEEDTEXTA. For example, if you were developing a UNICODEĪpplication, then TTN_NEEDTEXT would translate to TTN_NEEDTEXTW, but on Undecorated form of a message constant (e.i. Windows 95, the control notifications and messages are the ANSI versions.ĭo not rely on the project setting to automatically translate the plain, First, the list view control ( and the tooltipĬontrol ) is an ANSI control on Windows 95. The list view control on Windows 95 and Windows NT 4.0 have two very Was not very helpful and there are few details that you should be aware It can be easily modified to display something other that whats alreadyĪdding tooltips for individual cells is quite easy. The code below displays the text of the cell in a tooltip, but For this task, we will use the tooltip support providedīy MFC. They could also be used to expand the text Tooltips are very useful when column widths are limitedĭue to limited screen size.
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