/// <summary>
/// Ensures the child item has the appropriate TranslateTransform to perform the animation.
/// </summary>
/// <param name="child">the child item.</param>
/// <returns>Transform Information.</returns>
private TransformInformation ConfirmTransform(FrameworkElement child)
{
TransformInformation transformInformation = new TransformInformation();
// Check if TransformGroup already exists
if (child.RenderTransform.GetType() != typeof(TransformGroup))
{
// Create TranslateTransform and TransformGroup
TransformGroup transformGroup = new TransformGroup();
TranslateTransform translate = new TranslateTransform();
transformGroup.Children.Add(translate);
child.RenderTransform = transformGroup;
child.RenderTransformOrigin = new Point(0.5, 0.5);
// Initialise the TransformInformation class
transformInformation = new TransformInformation(translate, 0);
}
else
{
// Check that a RenderTransform object exists within the TransformGroup
TransformGroup transformGroup = (TransformGroup)child.RenderTransform;
TranslateTransform translate = new TranslateTransform();
bool needsGenerating = true;
int positionInCollection = 0;
for (int i = 0; i < transformGroup.Children.Count; i++)
{
if (transformGroup.Children[i].GetType() == typeof(TranslateTransform))
{
translate = (TranslateTransform)transformGroup.Children[i];
positionInCollection = i;
needsGenerating = false;
break;
}
}
if (needsGenerating)
{
// Add new TranslateTransform and add to current TransformGroup
transformGroup.Children.Add(translate);
positionInCollection = transformGroup.Children.Count - 1;
}
// Set Transform Properties
child.RenderTransform = transformGroup;
child.RenderTransformOrigin = new Point(0.5, 0.5);
// Create TransformInformation
transformInformation = new TransformInformation(translate, positionInCollection);
}
return(transformInformation);
}
/// <summary>
/// Ensures the child item has the appropriate TranslateTransform to perform the animation.
/// </summary>
/// <param name="child">the child item.</param>
/// <returns>Transform Information.</returns>
private TransformInformation ConfirmTransform(FrameworkElement child)
{
TransformInformation transformInformation = new TransformInformation();
// Check if TransformGroup already exists
if (child.RenderTransform.GetType() != typeof(TransformGroup))
{
// Create TranslateTransform and TransformGroup
TransformGroup transformGroup = new TransformGroup();
TranslateTransform translate = new TranslateTransform();
transformGroup.Children.Add(translate);
child.RenderTransform = transformGroup;
child.RenderTransformOrigin = new Point(0.5, 0.5);
// Initialise the TransformInformation class
transformInformation = new TransformInformation(translate, 0);
}
else
{
// Check that a RenderTransform object exists within the TransformGroup
TransformGroup transformGroup = (TransformGroup)child.RenderTransform;
TranslateTransform translate = new TranslateTransform();
bool needsGenerating = true;
int positionInCollection = 0;
for (int i = 0; i < transformGroup.Children.Count; i++)
{
if (transformGroup.Children[i].GetType() == typeof(TranslateTransform))
{
translate = (TranslateTransform)transformGroup.Children[i];
positionInCollection = i;
needsGenerating = false;
break;
}
}
if (needsGenerating)
{
// Add new TranslateTransform and add to current TransformGroup
transformGroup.Children.Add(translate);
positionInCollection = transformGroup.Children.Count - 1;
}
// Set Transform Properties
child.RenderTransform = transformGroup;
child.RenderTransformOrigin = new Point(0.5, 0.5);
// Create TransformInformation
transformInformation = new TransformInformation(translate, positionInCollection);
}
return transformInformation;
}
/// <summary>
/// Performs the layout for all child controls.
/// </summary>
/// <param name="finalSize">The space available for the panel to display its child objects.</param>
/// <returns>Size of the panel.</returns>
protected override Size ArrangeOverride(Size finalSize)
{
base.ArrangeOverride(finalSize);
double top = 0;
double left = 0;
bool widthInfinity = false;
bool heightInfinity = false;
double greatestHeight = 0;
double greatestWidth = 0;
// Check finalSize does not return infinity
if (double.IsInfinity(finalSize.Width))
{
widthInfinity = true;
}
if (double.IsInfinity(finalSize.Height))
{
heightInfinity = true;
}
foreach (FrameworkElement child in this.Children)
{
if (this.wrapDirection == WrapDirection.Horizontal)
{
// If infinite space is available, keep positioning left to right
// If not, check to see if we have reached our furthest position
if (!widthInfinity)
{
if (left + child.DesiredSize.Width > finalSize.Width)
{
// Set top for new line and reset left and greatestHeight properties
top += greatestHeight;
left = 0;
greatestHeight = 0;
}
}
}
else
{
// If infinite space is available, keep positioning top to bottom
// If not, check to see if we have reached our furthest position
if (!heightInfinity)
{
if (top + child.DesiredSize.Height > finalSize.Height)
{
// Set top for new line and reset left and greatestHeight properties
left += greatestWidth;
top = 0;
greatestWidth = 0;
}
}
}
// Create child within panel
child.Arrange(new Rect(0, 0, child.DesiredSize.Width, child.DesiredSize.Height));
// Ensure the child item has a unique name
this.ConfirmItemName(child);
// Get the information about the Transform applied to the item
TransformInformation information = this.ConfirmTransform(child);
TranslateTransform translate = information.TranslateTransform;
// Set child element position to where it is currently
if (!this.AnimateOnInitialise && !this.performedInitialLayout)
{
// Set in correct position
translate.X = left;
translate.Y = top;
}
// Get the Storyboard for the child item
Storyboard storyboard = this.ConfirmStoryboard(child, information.PositionInCollection);
// Configure animation properties for translateX
DoubleAnimation leftAnim = (DoubleAnimation)storyboard.Children[0];
leftAnim.To = left;
// Configure animation properties for translateX
DoubleAnimation topAnim = (DoubleAnimation)storyboard.Children[1];
topAnim.To = top;
// Check if the item is new and set FROM property accordingly
if (!GetDisableEntrance(child) && this.EntranceAnimationEnabled)
{
// Set FROM Property
Point enterFrom = this.GetEntryPosition(child);
leftAnim.From = enterFrom.X;
topAnim.From = enterFrom.Y;
translate.X = enterFrom.X;
translate.Y = enterFrom.Y;
SetDisableEntrance(child, true);
}
else if (!GetDisableEntrance(child) && !this.EntranceAnimationEnabled)
{
leftAnim.From = left;
topAnim.From = top;
SetDisableEntrance(child, true);
}
else
{
leftAnim.From = null;
topAnim.From = null;
SetDisableEntrance(child, true);
}
// Begin the Storyboard
storyboard.Begin();
#if SILVERLIGHT
// Check if the item is a design-time entrance preview
// Provide design-time preview of entrance
if (DesignerProperties.GetIsInDesignMode(Application.Current.RootVisual))
{
storyboard.Completed += new EventHandler(this.EntrancePreviewStoryboard_Completed);
}
#endif
// Increment the positioning variables based on orientation
if (this.wrapDirection == WrapDirection.Horizontal)
{
left += child.DesiredSize.Width;
}
else
{
top += child.DesiredSize.Height;
}
// Keep track of greatest height and width on this line of items
if (child.DesiredSize.Width > greatestWidth)
{
greatestWidth = child.DesiredSize.Width;
}
if (child.DesiredSize.Height > greatestHeight)
{
greatestHeight = child.DesiredSize.Height;
}
}
// Indicate that the panel has completed the first layout pass
this.performedInitialLayout = true;
// Clip out of bound content
RectangleGeometry rectangleGeometry = new RectangleGeometry();
Rect clip = new Rect(new Point(0, 0), new Size(finalSize.Width, finalSize.Height));
rectangleGeometry.Rect = clip;
this.Clip = rectangleGeometry;
return(finalSize);
}
