/// <summary>
/// Initialize a new instance of the GalleryItemController class.
/// </summary>
/// <param name="target">Target for state changes.</param>
/// <param name="layout">Reference to layout of the image items.</param>
/// <param name="needPaint">Delegate for notifying paint requests.</param>
public GalleryItemController(ViewDrawRibbonGalleryItem target,
ViewLayoutRibbonGalleryItems layout,
NeedPaintHandler needPaint)
{
Debug.Assert(target != null);
Debug.Assert(layout != null);
_mousePoint = CommonHelper.NullPoint;
_target = target;
_layout = layout;
NeedPaint = needPaint;
}
public void SyncChildren()
{
int required = 0;
int selectedIndex = _gallery.SelectedIndex;
ImageList imageList = _gallery.ImageList;
// Find out how many children we need
if (imageList != null)
{
required = _gallery.ImageList.Images.Count;
}
// If we do not have enough already
if (Count < required)
{
// Create and add the number extra needed
int create = required - Count;
for (int i = 0; i < create; i++)
{
Add(new ViewDrawRibbonGalleryItem(_gallery, _triple, this, _needPaint));
}
}
else if (Count > required)
{
// Destroy the extra ones no longer needed
int remove = Count - required;
for (int i = 0; i < remove; i++)
{
RemoveAt(0);
}
}
// Tell each item the image it should be displaying
for (int i = 0; i < required; i++)
{
ViewDrawRibbonGalleryItem item = (ViewDrawRibbonGalleryItem)this[i];
item.ImageList = imageList;
item.ImageIndex = i;
item.Checked = (selectedIndex == i);
}
}