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Problem
I have cells containing several choices. I don't want to display them in a combobox. Is there a way that the user is able to select items from the choice-list by clicking on spin-buttons?
Cause
Action
Yes, you can derive a class from CGXSpinEdit and display the choice-list entry associated with the zero-based index value. You need to override GetControlText() and GetValue().
If you implement the following class CSpinListControl:
| // header (.h) file
class CspinListControl: public CGXSpinEdit |
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| DECLARE_CONTROL(CSpinListControl) | ||||||
| public: | ||||||
| // Constructor & Destructor CspinListControl(CGXGridCore* pGrid, UINT nID); // Overrides // Attributes |
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| // TRUE if control should store zero-based index as value; // FALSE if control should store choice list entry as value. |
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| // Generated message map functions | ||||||
| protected: | ||||||
| //{{AFX_MSG(CSpinListControl) //}}AFX_MSG DECLARE_MESSAGE_MAP() |
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| }; | ||||||
| // implementation (.cpp) file
////////////////////////////////////////////////////////////////// IMPLEMENT_CONTROL(CSpinListControl, CGXSpinEdit) CspinListControl::CSpinListControl(CGXGridCore* pGrid, UINT nID) |
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| : CGXSpinEdit(pGrid, nID) | ||||||
| { | ||||||
| m_bUseIndexValue = FALSE; | ||||||
| // TRUE if control should store zero-based index as value. // FALSE if control should store choice list entry as value. |
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| }
BEGIN_MESSAGE_MAP(CSpinListControl, CGXSpinEdit) |
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| //{{AFX_MSG_MAP(CSpinListControl)
//}}AFX_MSG_MAP |
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| END_MESSAGE_MAP()
// GetControlText |
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| if (!CGXSpinEdit::GetValue(sResult)) | ||||||
| return FALSE; | ||||||
| if (m_bUseIndexValue && m_pStyle && m_pStyle->GetIncludeChoiceList()) { |
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| CString sMatch = sResult;
// finds exact string or the first string with the same prefix if (nIndex != -1) |
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| wsprintf(sResult.GetBuffer(20), _T("%d"), nIndex); sResult.ReleaseBuffer(); |
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| } else |
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| sResult.Empty(); | ||||||
| }
return TRUE; |
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| }
BOOL CSpinListControl::GetControlText(CString& strResult, ROWCOL nRow, ROWCOL nCol, LPCTSTR pszRawValue, const CGXStyle& style) |
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| CString sItem;
if (m_bUseIndexValue) |
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| // determine index short nIndex = -1; if (pszRawValue && _tcslen(pszRawValue) > 0) |
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| nIndex = (short) _ttoi(pszRawValue); | ||||||
| else if (style.GetIncludeValue() && _tcslen(style.GetValueRef()) > 0) | ||||||
| nIndex = style.GetShortValue(); | ||||||
| if (nIndex != -1) | ||||||
| GetChoiceListItem(sItem, style.GetChoiceListRef(), nIndex); | ||||||
| // base class version will format the text as specified in mask pszRawValue = sItem; |
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| }
// Now, we can format this entry. |
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| }
void CSpinListControl::OnClickedButton(CGXChild* pChild) |
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| BOOL bActive = IsActive();
if (!bActive && !OnStartEditing()) |
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| return; | ||||||
| SetActive(TRUE);
NeedStyle(); CString strText; // empty cell, when user pressed alpahnumeric key |
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| LONG lValue ;
// style if ( m_bStartValue && strText.IsEmpty() ) |
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| lValue = m_nStartValue ; | ||||||
| else { |
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| // Non-Null cell if (m_bUseIndexValue) |
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| lValue = _ttol(strText); | ||||||
| else { |
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| CString sMatch = strText;
// finds exact string or the first string |
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| }
if (pChild == m_pUpArrow) |
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| if (!m_bMaxBound || lValue < m_nMaxBound) | ||||||
| lValue++; | ||||||
| else if (m_bWrap && m_bMinBound) | ||||||
| lValue = m_nMinBound; | ||||||
| } else { |
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| if (!m_bMinBound || lValue > m_nMinBound) | ||||||
| lValue--; | ||||||
| else if (m_bWrap && m_bMaxBound) | ||||||
| lValue = m_nMaxBound; | ||||||
| } | ||||||
| }
if (m_bMinBound) |
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| lValue = max(m_nMinBound, lValue); | ||||||
| if (m_bMaxBound) | ||||||
| lValue = min(m_nMaxBound, lValue); | ||||||
| if (m_bUseIndexValue) { |
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| wsprintf(sz, _T("%ld"), lValue); SetValue(sz); |
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| } else { |
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| CString sItem; GetChoiceListItem(sItem, m_pStyle->GetChoiceListRef(), lValue); SetValue(sItem); |
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| }
SetModify(TRUE); |
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| }
// eventually destroys and creates CEdit with appropriate window style |
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| Refresh(); | ||||||
| else | ||||||
| UpdateEditStyle(); | ||||||
| CGXControl::OnClickedButton(pChild); | ||||||
| }
void CSpinListControl::OnInitChildren(ROWCOL nRow, ROWCOL nCol, const CRect& rect) |
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| nRow, nCol; const int nEditBtnWidth = 13; // CRect rect = CGXControl::GetCellRect(nRow, nCol, (LPRECT) &r, m_pStyle); // init arrow buttons m_pUpArrow->SetRect(CRect(rectBtn.left, rectBtn.top, rectBtn.right, rectBtn.top+rectBtn.Height()/2)); m_pDownArrow->SetRect(CRect(rectBtn.left, rectBtn.top+rectBtn.Height()/2, rectBtn.right, rectBtn.bottom)); |
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| }
// override the Draw method only if you want that the spin-buttons |
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| pStandardStyle, style; CGXSpinEdit::Draw(pDC, rect, nRow, nCol, style, pStandardStyle); // Normal, spin-buttons are not drawn for inactive cells. |
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| for (int i = 0; i < GetCount(); i++) { |
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| CGXChild* pChild;
if ((pChild = GetChild(i)) != NULL) |
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| pChild->Draw(pDC, !Grid()->IsPrinting()); | ||||||
| } | ||||||
| } | ||||||
| } | ||||||
You can register the control and user attribute in the OnInitialUpdate() routine of your grid class with:
| // Register all controls and user attributes for the view // IDS_CTRL_SPINLIST is a string resource // you have to add to your application. RegisterControl(IDS_CTRL_SPINLIST, new CspinListControl(this, IDS_CTRL_SPINLIST)); |
and later apply it to cells with:
| SetStyleRange(CGXRange(4,4,10,4), | |||
| CGXStyle() | |||
| .SetControl(IDS_CTRL_SPINLIST) .SetUserAttribute(GX_IDS_UA_SPINBOUND_MIN, "0") .SetUserAttribute(GX_IDS_UA_SPINBOUND_MAX, "4") .SetUserAttribute(GX_IDS_UA_SPINBOUND_WRAP, "1") .SetUserAttribute(GX_IDS_UA_SPINSTART, "0") .SetChoiceList("one two three four five") |
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| ); | |||
You can determine the index of the selected choice in the cell with:
| int nIndex = _ttoi(GetValueRowCol(nRow, nCol)); |
