/// <summary>
/// 处理鼠标按键按下事件
/// </summary>
/// <param name="e"></param>
protected override void OnMouseClick(MouseEventArgs e)
{
CheckInvalidateState();
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
bool changed = false;
ImageListBoxItem currentItem = GetItem(e.X, e.Y);
if (this.MultiSelect)
{
if (currentItem != null)
{
currentItem.Selected = !currentItem.Selected;
this.InvalidateItem(currentItem);
changed = true;
}
}
else
{
foreach (ImageListBoxItem item in this.Items)
{
if (item.Selected != (item == currentItem))
{
item.Selected = (item == currentItem);
this.InvalidateItem(item);
changed = true;
}
}
}
if (changed)
{
OnSelectedIndexChanged(EventArgs.Empty);
}
}
base.OnMouseClick(e);
}
private void InvalidateItem(ImageListBoxItem item)
{
CheckInvalidateState();
if (item != null)
{
this.Invalidate(GetItemBounds(item));
}
}
public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object Value)
{
if (Value is InstanceDescriptor)
{
ImageListBoxItem item = new ImageListBoxItem();
InstanceDescriptor descriptor = (InstanceDescriptor)Value;
return(item);
}
return(base.ConvertFrom(context, culture, Value));
}
public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object Value, Type destinationType)
{
if (destinationType.Equals(typeof(InstanceDescriptor)))
{
//MessageBox.Show("aa");
ImageListBoxItem item = (ImageListBoxItem)Value;
InstanceDescriptor descriptor = new InstanceDescriptor(typeof(ImageListBoxItem).GetConstructor(new Type[] { }), null, false);
return(descriptor);
}
return(base.ConvertTo(context, culture, Value, destinationType));
}
public Rectangle GetItemBounds(ImageListBoxItem item)
{
CheckInvalidateState();
if (item == null)
{
throw new ArgumentNullException("item");
}
int index = this.Items.IndexOf(item);
if (index >= 0)
{
return(new Rectangle(
1,
this.AutoScrollPosition.Y + this.RuntimeItemHeight * index,
this.ClientSize.Width - 2,
this.RuntimeItemHeight));
}
else
{
throw new ArgumentOutOfRangeException("item not in list");
}
}