protected override void OnDrawItem(DrawItemEventArgs e)
{
base.OnDrawItem(e);
if (Items.Count > 0)
{
FileBoxItem item = (FileBoxItem)Items[e.Index];
if (!item.IsImageLoaded)
{
OnDemandImageLoadStack.Push(e);
ImageLoadTimer.Enabled = true;
}
item.DrawItem(e, this);
}
}
private void LoadImage(object sender, ElapsedEventArgs e)
{
if (OnDemandImageLoadStack.Count == 0)
{
ImageLoadTimer.Enabled = false;
return;
}
try {
DrawItemEventArgs itemEventArgs = OnDemandImageLoadStack.Pop();
int index = itemEventArgs.Index;
FileBoxItem item = (FileBoxItem)Items[index];
item.LoadImage(ImageSize.Width, ImageSize.Height);
int numVisibleItems = ClientSize.Height / ItemHeight;
int nextIndex = -1;
if (OnDemandImageLoadStack.Count > 0)
{
try {
nextIndex = OnDemandImageLoadStack.Peek().Index;
} catch (NullReferenceException) {
// Null event args
}
}
this.InvokeSafe(() => {
// Refresh only if we aren't going to have to refresh after the next item as well
if ((index >= TopIndex && index <= TopIndex + numVisibleItems) &&
!(nextIndex >= TopIndex && nextIndex <= TopIndex + numVisibleItems))
{
Refresh();
}
});
} catch (ArgumentOutOfRangeException) {
// ignored
}
}
protected bool Equals(FileBoxItem other)
{
return(string.Equals(DirectoryName, other.DirectoryName, StringComparison.OrdinalIgnoreCase) &&
string.Equals(FileName, other.FileName, StringComparison.OrdinalIgnoreCase));
}