/// <summary>
/// Provides the behavior for the "Arrange" pass of Silverlight layout. Classes can override this method to define their own arrange pass behavior.
/// </summary>
/// <param name="finalSize">The final area within the parent that this object should use to arrange itself and its children.</param>
/// <returns>The actual size used.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
foreach (UIElement child in this.Children)
{
WrapPanelAttachedData data = GetWrapPanelAttachedData(child);
child.Arrange(new Rect(data.TargetPosition.X, data.TargetPosition.Y, child.DesiredSize.Width, this.rowHeights[data.Row]));
}
return(finalSize);
}
/// <summary>
/// Gets the wrap panel attached data.
/// </summary>
/// <param name="obj">The <see cref="DependencyObject"/>.</param>
/// <returns>The <see cref="WrapPanelAttachedData"/>.</returns>
private static WrapPanelAttachedData GetWrapPanelAttachedData(DependencyObject obj)
{
object value = obj.GetValue(WrapPanelAttachedDataProperty);
if (value == null)
{
WrapPanelAttachedData data = new WrapPanelAttachedData();
SetAnimatedWrapPanelAttachedData(obj, data);
return(data);
}
return((WrapPanelAttachedData)value);
}
/// <summary>
/// Provides the behavior for the "measure" pass of Silverlight layout. Classes can override this method to define their own measure pass behavior.
/// </summary>
/// <param name="availableSize">The available size that this object can give to child objects. Infinity can be specified as a value to indicate that the object will size to whatever content is available.</param>
/// <returns>
/// The size that this object determines it needs during layout, based on its calculations of child object allotted sizes.
/// </returns>
protected override Size MeasureOverride(Size availableSize)
{
foreach (FrameworkElement child in this.Children)
{
child.Measure(availableSize);
}
double rowHeight = 0;
int row = 0;
this.rowHeights.Clear();
this.indexRowMapping.Clear();
Size desiredSize = Size.Empty;
int elementNo = 0;
Point nextChildPosition = new Point(0, 0);
foreach (FrameworkElement child in this.Children)
{
if (nextChildPosition.X + child.DesiredSize.Width > availableSize.Width)
{
this.rowHeights.Add(rowHeight);
++row;
nextChildPosition.X = 0;
nextChildPosition.Y += rowHeight;
rowHeight = 0;
}
// Insert the index of the item and the row no.
this.indexRowMapping.Add(elementNo, row);
elementNo++;
WrapPanelAttachedData data = GetWrapPanelAttachedData(child);
if (data.TargetPosition != nextChildPosition)
{
data.TargetPosition = nextChildPosition;
data.Row = row;
}
desiredSize.Width = Math.Max(desiredSize.Width, nextChildPosition.X + child.DesiredSize.Width);
desiredSize.Height = Math.Max(desiredSize.Height, nextChildPosition.Y + child.DesiredSize.Height);
rowHeight = Math.Max(rowHeight, child.DesiredSize.Height);
nextChildPosition.X += child.DesiredSize.Width;
}
this.rowHeights.Add(rowHeight);
return(desiredSize);
}
/// <summary>
/// Sets the <see cref="WrapPanelAttachedData"/>.
/// </summary>
/// <param name="obj">The <see cref="DependencyObject"/>.</param>
/// <param name="value">The <see cref="WrapPanelAttachedData"/>.</param>
private static void SetAnimatedWrapPanelAttachedData(DependencyObject obj, WrapPanelAttachedData value)
{
obj.SetValue(WrapPanelAttachedDataProperty, value);
}
