private void ScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
if ((int)(e.VerticalOffset / (e.ExtentHeight - e.ViewportHeight) * 100) >= RatioTriggeringScroll)
{
if (Items.Count < Data.Count)
{
int itemsCount = Items.Count;
for (int i = itemsCount; i < (itemsCount + MuchToOutput < Data.Count ? itemsCount + MuchToOutput : Data.Count); i++)
{
var checkBox = new CheckBoxForExpander();
checkBox.VerticalAlignment = VerticalAlignment.Top;
checkBox.HorizontalAlignment = HorizontalAlignment.Left;
checkBox.Margin = new Thickness(10, 10 + (i * 30), 0, 0);
checkBox.IsChecked = ContainsValue(Data[i]);
checkBox.Data = Data[i];
checkBox.DisplayMemberPath = DisplayMemberPath;
checkBox.SelectedValuePath = SelectedValuePath;
checkBox.CheckedChanged += CheckBox_CheckedChanged;
Items.Add(checkBox);
RenderContorl(checkBox);
}
}
}
}
private void GenerateItems()
{
Items.Clear();
for (int i = 0; i < (Data.Count > StartupToOutput ? StartupToOutput : Data.Count); i++)
{
var checkBox = new CheckBoxForExpander();
checkBox.VerticalAlignment = VerticalAlignment.Top;
checkBox.HorizontalAlignment = HorizontalAlignment.Left;
checkBox.Margin = new Thickness(10, 10 + (i * 30), 0, 0);
checkBox.IsChecked = ContainsValue(Data[i]);
checkBox.Data = Data[i];
checkBox.DisplayMemberPath = DisplayMemberPath;
checkBox.SelectedValuePath = SelectedValuePath;
checkBox.CheckedChanged += CheckBox_CheckedChanged;
Items.Add(checkBox);
}
}