How to enable/disable checkbox on CGridCtrl in MFC

Question

I am using MFC Grid control 2.27 ( http://www.codeproject.com/Articles/8/MFC-Grid-control-2-27 ) in my project. I would like to enable/disable checkbox on CGridCtrl . I'm not able to find the direct method to disable the check box. In fact, when I write the following line, it disables the grid cell on which checkbox is shown, while checkbox remains enabled.

m_Grid2.GetCell(row,col)->SetState(GVIS_READONLY);

Please suggest any way to disable/enable both checkbox and grid cell at runtime.

Answer 1

My suggestion is to add a second image list to the control. This image list would have disabled (greyed) versions of your images.

In CGridCtrl header you add:

void SetDisabledImageList(CImageList* pList) { m_pDisabledImageList = pList; }
CImageList* GetDisabledImageList() const { return m_pDisabledImageList; }

And add the variable, just after the existing m_pImageList :

CImageList* m_pDisabledImageList;

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Now you need to prepare yourself a disabled version of your images and populate a CImageList (beyond the scope of this answer - just need a greyscale version of your image resource). Then, you simply pass that image list in using the new SetDisabledImageList method.

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Finally, you modify the CGridCellBase::Draw method and massage the code like this:

CImageList *pImageListToUse = nullptr;
if (!pGrid->IsWindowEnabled())
    pImageListToUse = pGrid->GetDisabledImageList();

if(pImageListToUse == nullptr)
    pImageListToUse = pGrid->GetImageList();

So, whenever you set the cell as read only , as in your original code, it will render the icon using the disabled image list icons.

The above works OK for me.