private NativeMethods.ComboBoxInfo GetComboBoxInfo()
{
NativeMethods.ComboBoxInfo cbi = new NativeMethods.ComboBoxInfo();
cbi.cbSize = Marshal.SizeOf(cbi);
NativeMethods.GetComboBoxInfo(base.Handle, ref cbi);
return(cbi);
}
protected override void OnCreateControl()
{
base.OnCreateControl();
NativeMethods.ComboBoxInfo cbi = GetComboBoxInfo();
_editHandle = cbi.hwndEdit;
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
NativeMethods.ComboBoxInfo cbi = new NativeMethods.ComboBoxInfo();
cbi.cbSize = Marshal.SizeOf(cbi);
NativeMethods.GetComboBoxInfo(base.Handle, ref cbi);
_editHandle = cbi.hwndEdit;
if (DropDownStyle != ComboBoxStyle.DropDownList)
{
_editNativeWindow = new EditNativeWindow(this);
}
}
protected override void OnCreateControl()
{
base.OnCreateControl();
//设置为手动绘制
this.DrawMode = DrawMode.OwnerDrawFixed;
//设置固定的DropDownList样式
this.DropDownStyle = ComboBoxStyle.DropDownList;
this.ItemHeight = 25;
//设置为手动绘制
if (!DesignMode && this.Items.Count != 0)
{
this.DropDownHeight = this.Items.Count * 5;
if (this.DropDownHeight > 150)
{
this.DropDownHeight = 150;
}
}
NativeMethods.ComboBoxInfo cbi = GetComboBoxInfo();
_editHandle = cbi.hwndEdit;
dplisthandel = cbi.hwndList;
}
private Rectangle GetDropDownButtonRect()
{
NativeMethods.ComboBoxInfo cbi = GetComboBoxInfo();
return(cbi.rcButton.Rect);
}
private bool GetComboBoxButtonPressed()
{
NativeMethods.ComboBoxInfo cbi = GetComboBoxInfo();
return(cbi.stateButton ==
NativeMethods.ComboBoxButtonState.STATE_SYSTEM_PRESSED);
}
