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Problem
Does OG support drag and drop from one cell to another (I don't want to use OLE Drag and Drop)?
Cause
Action
Drag and drop from one cell to another is possible even if you don't want to use OLE Drag and Drop. Here are some steps you have to follow:
First, you should disable selecting cells, for example:
| // disable selecting cells GetParam( )->EnableSelection(GX_SELNONE); |
Next, you should override OnLButtonHitRowCol( ). This virtual method is called when the user clicks on a cell and drags the mouse cursor.
| BOOL CGridSampleView::OnLButtonHitRowCol(ROWCOL nHitRow, ROWCOL nHitCol, ROWCOL nDragRow, ROWCOL nDragCol, CPoint point, UINT flags, WORD nHitState) { |
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| if (!CMyGridView::OnLButtonHitRowCol(nHitRow, nHitCol, nDragRow, nDragCol, point, flags, nHitState)) | |||||
| return FALSE; | |||||
| // determine style and control of the cell const CGXStyle& style = LookupStyleRowCol(nHitRow, nHitCol); CGXControl* pControl = GetRegisteredControl(style.GetControl( )); if (nHitRow > 0 && nHitCol > 0) |
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| if (nHitState & GX_HITSTART) { } else if (nHitState & GX_HITMOVE) { |
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| if (m_nDragRow != nHitRow || nDragCol != nHitCol) { |
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| // display drag-cursor SetGridCursor(GX_IDC_SELDRAG); |
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| } else { |
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| // reset cursor SetGridCursor(0); |
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| } | |||||
| } else if (nHitState & GX_HITEND) { |
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| if (m_nDragRow != nHitRow || nDragCol != nHitCol) { |
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| // Here, you should provide your code // to execute the dragging-operation |
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| }
// reset cursor |
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| } | |||||
| }
return TRUE; |
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| } | |||||
You can also take a look at the "Headers"-Page in gridapp (source is in gridsvw7.cpp), this sample allows dragging columns by clicking on a column header and then dragging the mouse.
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