public override Size CalcRequiredDropDownSize()
{
var size = base.CalcRequiredDropDownSize();
if ((DropDownControl != null) && (Items.Count > 0))
{
int checkSize = 0;
if (Application.RenderWithVisualStyles)
{
using (Graphics graphics = m_ListBox.CreateGraphics())
checkSize = (int)(CheckBoxRenderer.GetGlyphSize(graphics, CheckBoxState.CheckedNormal)).Width;
}
else
{
checkSize = 16; // TODO
}
checkSize += 4;
size.Height = Items.Count * Math.Max(m_ListBox.ItemHeight, checkSize);
for (int index = 0; index < Items.Count; index++)
{
var text = Items[index].ToString();
if (!string.IsNullOrEmpty(text))
{
int itemWidth = TextRenderer.MeasureText(text, m_ListBox.Font).Width;
size.Width = Math.Max(itemWidth + checkSize, size.Width);
}
}
}
return(size);
}
internal static void UpdateFieldsCheckedListBoxColumnWidth(CheckedListBox checkedListBox)
{
int num = 0;
using (Graphics graphics = checkedListBox.CreateGraphics())
{
foreach (object obj2 in checkedListBox.Items)
{
string text = obj2.ToString();
num = Math.Max(num, (int)graphics.MeasureString(text, checkedListBox.Font).Width);
}
}
num += 50;
checkedListBox.ColumnWidth = num;
}
/// <summary>
/// Edits the specified object's value using the editor style indicated by the
/// System.Drawing.Design.UITypeEditor.GetEditStyle() method</summary>
/// <param name="context">An System.ComponentModel.ITypeDescriptorContext that can be used to gain
/// additional context information</param>
/// <param name="provider">An System.IServiceProvider that this editor can use to obtain services</param>
/// <param name="value">The object to edit</param>
/// <returns>The new value of the object. If the value of the object has not changed, this should
/// return the same object it was passed.</returns>
public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
m_editorService =
provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
if (m_editorService != null)
{
CheckedListBox checkedListBox = new CheckedListBox();
checkedListBox.CheckOnClick = true;
foreach (string displayName in m_displayNames)
{
checkedListBox.Items.Add(displayName);
}
// size control so all strings are completely visible
using (System.Drawing.Graphics g = checkedListBox.CreateGraphics())
{
float width = 0f;
foreach (string displayName in m_displayNames)
{
float w = g.MeasureString(displayName, checkedListBox.Font).Width;
width = Math.Max(width, w);
}
float height = m_displayNames.Length * checkedListBox.ItemHeight;
int scrollBarThickness = SystemInformation.VerticalScrollBarWidth;
if (height > checkedListBox.Height - 4) // vertical scrollbar?
{
width += SystemInformation.VerticalScrollBarWidth;
}
if (width > checkedListBox.Width)
{
checkedListBox.Width = (int)width + 31; // magic number from Windows.Forms dll
}
}
if (value is string)
{
FillCheckedListBoxFromString(value, checkedListBox);
}
else if (value is int || value is uint)
{
FillCheckedListBoxFromInt(value, checkedListBox);
}
// otherwise, ignore value
m_editorService.DropDownControl(checkedListBox);
object newValue;
if (value is string)
{
newValue = ExtractStringFromCheckedListBox(checkedListBox);
}
else
{
newValue = ExtractIntFromCheckedListBox(checkedListBox);
}
// be careful to return the same object if the value didn't change
if (!newValue.Equals(value))
{
value = newValue;
}
}
return(value);
}