/// <summary>
/// RevealModeProperty property changed handler.
/// </summary>
/// <param name="d">ExpandableContentControl that changed its RevealMode.</param>
/// <param name="e">Event arguments.</param>
private static void OnRevealModePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ExpandableContentControl source = (ExpandableContentControl)d;
ExpandDirection value = (ExpandDirection)e.NewValue;
if (value != ExpandDirection.Down &&
value != ExpandDirection.Left &&
value != ExpandDirection.Right &&
value != ExpandDirection.Up)
{
// revert to old value
source.RevealMode = (ExpandDirection)e.OldValue;
string message = string.Format(
CultureInfo.InvariantCulture,
"Properties.Resources.Expander_OnExpandDirectionPropertyChanged_InvalidValue",
value);
throw new ArgumentException(message, "e");
}
// set the non-reveal dimension
source.SetNonRevealDimension();
// calculate the reveal dimension
source.SetRevealDimension();
}
/// <summary>
/// TargetSizeProperty property changed handler.
/// </summary>
/// <param name="d">ExpandableContentControl that changed its TargetSize.</param>
/// <param name="e">Event arguments.</param>
private static void OnTargetSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ExpandableContentControl source = (ExpandableContentControl)d;
Size value = (Size)e.NewValue;
// recalculate percentage based on this new targetsize.
// for instance, percentage was at 1 and width was 100. Now width was changed to 200, this means
// that the percentage needs to be set to 0.5 so that a reveal animation can be started again.
source.RecalculatePercentage(value);
}
/// <summary>
/// ContentTargetSizeProperty property changed handler.
/// </summary>
/// <param name="d">AccordionItem that changed its ContentTargetSize.</param>
/// <param name="e">Event arguments.</param>
private static void OnContentTargetSizePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
AccordionItem source = (AccordionItem)d;
Size targetSize = (Size)e.NewValue;
if (!source._allowedToWriteContentTargetSize)
{
// revert to old value
source.ContentTargetSize = (Size)e.OldValue;
throw new InvalidOperationException("Properties.Resources.AccordionItem_InvalidWriteToContentTargetSize");
}
// Pass the value to the expandSite
// This is done explicitly so an animation action can be scheduled
// deterministicly.
ExpandableContentControl expandSite = source.ExpandSite;
if (expandSite != null && !expandSite.TargetSize.Equals(targetSize))
{
expandSite.TargetSize = targetSize;
if (source.IsSelected)
{
if (source.ParentAccordion != null && source.ParentAccordion.IsResizing)
{
// if the accordion is resizing, this item should snap immediately
expandSite.Percentage = 1;
}
else
{
// otherwise schedule the resize
source.Schedule(AccordionAction.Resize);
}
}
}
}
/// <summary>
/// PercentageProperty property changed handler.
/// </summary>
/// <param name="d">Page that changed its Percentage.</param>
/// <param name="e">Event arguments.</param>
private static void OnPercentagePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
ExpandableContentControl source = (ExpandableContentControl)d;
source.SetRevealDimension();
}