CComboBox::SetDroppedWidth

int SetDroppedWidth( UINT nWidth );

Return Value

If successful, the new width of the list box, otherwise CB_ERR.

Parameters

nWidth

The minimum allowable width of the list-box portion of the combo box, in pixels.

Remarks

Call this function to set the minimum allowable width, in pixels, of the list box of a combo box. This function only applies to combo boxes with the CBS_DROPDOWN or CBS_DROPDOWNLIST style.

By default, the minimum allowable width of the drop-down list box is 0. When the list-box portion of the combo box is displayed, its width is the larger of the minimum allowable width or the combo box width.

Example

// The pointer to my combo box.
extern CComboBox* pmyComboBox;

// Find the longest string in the combo box.
CString str;
CSize   sz;
int     dx=0;
CDC*    pDC = pmyComboBox->GetDC();
for (int i=0;i < pmyComboBox->GetCount();i++)
{
   pmyComboBox->GetLBText( i, str );
   sz = pDC->GetTextExtent(str);

   if (sz.cx > dx)
      dx = sz.cx;
}
pmyComboBox->ReleaseDC(pDC);

// Adjust the width for the vertical scroll bar and the left and right border.
dx += ::GetSystemMetrics(SM_CXVSCROLL) + 2*::GetSystemMetrics(SM_CXEDGE);

// Set the width of the list box so that every item is completely visible.
pmyComboBox->SetDroppedWidth(dx);

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