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Problem
I can't get more than 32 items to work correctly in CGXCheckListComboBox. Is this because of the fact that it uses a bitmapped integer (32 bit long) to pass the choices around? How can I get around this?
Cause
Action
There are many alternatives when you subclass CGXCheckListComboBox. Here are two solutions we found very convenient:
- Subclass CGXCheckListComboBox and store the checked state in a hash table that you attach to the style object through SetItemDataPtr().
- Subclass CGXCheckListComboBox and store each choice list entry separated by a comma as value in the cell.
Solution a: Subclass CGXCheckListComboBox and store the checked state in a hash table that you attach to the style object through SetItemDataPtr().
| //.h file
//CMyCheckListComboBox control |
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| DECLARE_CONTROL(CMyCheckListComboBox) | ||||
| public: | ||||
| CMyCheckListComboBox(CGXGridCore* pGrid, UINT nEditID = 0, UINT nListBoxID = 0);
// Overridden these methods |
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| };
//.cpp file #include <afxtempl.h> //include this for CMap template defenition IMPLEMENT_CONTROL(CMyCheckListComboBox,CGXCheckListComboBox) CMyCheckListComboBox::CMyCheckListComboBox(CGXGridCore* pGrid, UINT nEditID, UINT nListBoxID) |
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| : CGXCheckListComboBox(pGrid, nEditID, nListBoxID) | ||||
| {
} void CmyCheckListComboBox::OnStoreDroppedList(CListBox* lbox) |
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| CGXStyle style = Grid()->LookupStyleRowCol(m_nRow, m_nCol); CGXCheckListComboLBox* checklbox = (CGXCheckListComboLBox*) lbox; ASSERT(checklbox->IsKindOf(RUNTIME_CLASS(CGXCheckListComboLBox))); //This is the CMap template that you should attach to if(myMap == NULL) |
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| myMap = new CMap<int, int, BOOL, BOOL>; | ||||
| // Save the selection // enable choices //Clean up the existing map before you store the new value into it myMap->RemoveAll(); for (int n = 0; n < m_nCount; n++) { |
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| if (checklbox->GetCheck(n) == 1) { |
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| myMap->SetAt(n,TRUE); | ||||
| } | ||||
| }
style.SetItemDataPtr(myMap); |
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| }
void CMyCheckListComboBox::OnFillDroppedList(CListBox* lbox) |
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| const CGXStyle& style = Grid()->LookupStyleRowCol(m_nRow, m_nCol); CGXCheckListComboLBox* checklbox = (CGXCheckListComboLBox*) lbox; ASSERT(checklbox->IsKindOf(RUNTIME_CLASS(CGXCheckListComboLBox))); CMap<int,int, BOOL,BOOL> *myMap; //You should have attached a CMap template of |
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| CString s = style.GetChoiceListRef(); CString sItem; // skip first entry in choice list because while (!s.IsEmpty() && n != -1) |
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| n = GXGetNextLine(s, sItem); lbox->AddString(sItem); m_nCount++; |
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| } | ||||
| }
// enable choices |
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| BOOL b=FALSE;
for (int n = 0; n < m_nCount; n++) |
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| b=FALSE; myMap->Lookup(n,b); checklbox->SetCheck(n, b); |
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| } | ||||
| } | ||||
| } | ||||
Register your control:
| RegisterControl(GX_IDS_CTRL_CHECKLIST_COMBOBOX, | ||
| new CMyCheckListComboBox(this, 9000,9001/*random id*/)); | ||
Set the control in the cell like this:
| LPCTSTR szMultiChoiceList = | _T("Click Me ") _T("One ") _T("Two ") _T("Three ") _T("Four ") _T("Five ") _T("Six ") _T("Seven ") _T("Eight ") _T("Nine ") _T("Ten "); |
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| CMap<int,int, BOOL,BOOL> *myMap = new CMap<int,int, BOOL,BOOL>; myMap->SetAt(1,TRUE); SetStyleRange(CGXRange().SetRows(nRow+1), |
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| CGXStyle() | ||||
| .SetControl(GX_IDS_CTRL_CHECKLIST_COMBOBOX) .SetChoiceList(szMultiChoiceList) .SetItemDataPtr(myMap) |
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| ); | ||||
This will check the item "Two" (the list is 0 based).
You can retrieve the checked state of the control using:
| CGXStyle style = LookupStyleRowCol(m_nRow, m_nCol); CMap<int,int, BOOL,BOOL> *myMap = style.GetItemDataPtr(); BOOL b=FALSE; if(myMap->Lookup(1,b) && b) |
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| TRACE("Item 1 is checked"); | ||
Solution b: Subclass CGXCheckListComboBox and store each choice list entry separated by a comma as value in the cell.
Override OnFillDroppedList( ) and OnStoreDroppedList( ) as follows:
| void CMyCheckListComboBox::OnFillDroppedList(CListBox* lbox) { |
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| const CGXStyle& style = Grid()->LookupStyleRowCol(m_nRow, m_nCol); CGXCheckListComboLBox* checklbox = (CGXCheckListComboLBox*) lbox; ASSERT(checklbox->IsKindOf(RUNTIME_CLASS(CGXCheckListComboLBox))); // fill with Choices |
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| CString s = style.GetChoiceListRef(); CString sItem; // skip first entry in choice list because while (!s.IsEmpty() && n != -1) |
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| n = GXGetNextLine(s, sItem); lbox->AddString(sItem); m_nCount++; |
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| } | ||||
| }
// enable choices |
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| CString s = style.GetValueRef(); int n = 0; CString sItem; while (!s.IsEmpty() && n != -1) |
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| n = GXGetNextLine(s, sItem); checklbox->SetCheck(_ttoi(sItem), TRUE); |
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| } | ||||
| } | ||||
| }
void CMyCheckListComboBox::OnStoreDroppedList(CListBox* lbox) |
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| CGXCheckListComboLBox* checklbox = (CGXCheckListComboLBox*) lbox; ASSERT(checklbox->IsKindOf(RUNTIME_CLASS(CGXCheckListComboLBox))); // Save the selection for (int n = 0; n < m_nCount; n++) |
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| if (checklbox->GetCheck(n) == 1) { |
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| wsprintf(sz, _T("%d "), n); sValue += sz; |
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| } | ||||
| }
Grid()->SetValueRange(CGXRange(m_nRow, m_nCol), sValue); |
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| } | ||||
Register your control:
| RegisterControl(GX_IDS_CTRL_CHECKLIST_COMBOBOX, | ||
| new CMyCheckListComboBox(this, 9000,9001/*random id*/)); | ||
Set the control in the cell like this:
| SetStyleRange(CGXRange().SetRows(nRow+1), | |||
| CGXStyle() | |||
| .SetControl(GX_IDS_CTRL_CHECKLIST_COMBOBOX) .SetChoiceList(szMultiChoiceList) .SetValue("Two Four ") |
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| ); | |||
This will check the item "Two" and "Four".
You can retrieve the checked state of the by looping through the value (with GXGetNextLine( )). This will return all checked items.
