CComboBox::GetHorizontalExtent
Retrieves from the combo box the width in pixels by which the list-box portion of the combo box can be scrolled horizontally.
UINT GetHorizontalExtent( ) const;
Return Value
The scrollable width of the list-box portion of the combo box, in pixels.
Remarks
This is applicable only if the list-box portion of the combo box has a horizontal scroll bar.
Example
// Find the longest string in the combo box.
CString strText;
CSize sz;
UINT dxText = 0;
CDC* pDCCombo = m_pComboBox->GetDC();
for (int i = 0; i < m_pComboBox->GetCount(); i++)
{
m_pComboBox->GetLBText(i, strText);
sz = pDCCombo->GetTextExtent(strText);
if (sz.cx > (LONG)dxText)
dxText = sz.cx;
}
m_pComboBox->ReleaseDC(pDCCombo);
// Set the horizontal extent only if the current extent is not large enough.
if (m_pComboBox->GetHorizontalExtent() < dxText)
{
m_pComboBox->SetHorizontalExtent(dxText);
ASSERT(m_pComboBox->GetHorizontalExtent() == dxText);
}
Requirements
Header: afxwin.h