CComboBox::SetHorizontalExtent
Sets the width, in pixels, by which the list-box portion of the combo box can be scrolled horizontally.
void SetHorizontalExtent(
UINT nExtent
);
Parameters
- nExtent
Specifies the number of pixels by which the list-box portion of the combo box can be scrolled horizontally.
Remarks
If the width of the list box is smaller than this value, the horizontal scroll bar will horizontally scroll items in the list box. If the width of the list box is equal to or greater than this value, the horizontal scroll bar is hidden or, if the combo box has the CBS_DISABLENOSCROLL style, disabled.
Example
// Find the longest string in the combo box.
CString str;
CSize sz;
int dx = 0;
TEXTMETRIC tm;
CDC* pDC = m_pComboBox->GetDC();
CFont* pFont = m_pComboBox->GetFont();
// Select the listbox font, save the old font
CFont* pOldFont = pDC->SelectObject(pFont);
// Get the text metrics for avg char width
pDC->GetTextMetrics(&tm);
for (int i = 0; i < m_pComboBox->GetCount(); i++)
{
m_pComboBox->GetLBText(i, str);
sz = pDC->GetTextExtent(str);
// Add the avg width to prevent clipping
sz.cx += tm.tmAveCharWidth;
if (sz.cx > dx)
dx = sz.cx;
}
// Select the old font back into the DC
pDC->SelectObject(pOldFont);
m_pComboBox->ReleaseDC(pDC);
// Set the horizontal extent so every character of all strings can
// be scrolled to.
m_pComboBox->SetHorizontalExtent(dx);
Requirements
Header: afxwin.h