/// <summary>
/// Prepares the <see cref="LayoutExecutor"/> that is called after the selection is deleted.
/// </summary>
private void OnDeletingSelection(object sender, SelectionEventArgs <IModelItem> e)
{
// determine the bounds of the selection
var rect = GetBounds(e.Selection);
// configure the layout that will fill free space
var layout = new FillAreaLayout {
ComponentAssignmentStrategy = ComponentAssignmentStrategy,
Area = rect.ToYRectangle()
};
// configure the LayoutExecutor that will perform the layout and morph the result
executor = new LayoutExecutor(GraphControl, layout)
{
Duration = TimeSpan.FromMilliseconds(100)
};
}
/// <summary>
/// Creates a layout algorithm suiting the <paramref name="resizeState"/>.
/// </summary>
/// <param name="resizeState">The current state of the gesture</param>
/// <returns>A layout algorithm suiting the <paramref name="resizeState"/>.</returns>
private ILayoutAlgorithm CreateLayout(ResizeState resizeState)
{
var sequentialLayout = new SequentialLayout();
if (resizeState == ResizeState.Shrinking)
{
// fill the free space of the shrunken node
fillLayout = new FillAreaLayout {
ComponentAssignmentStrategy = ComponentAssignmentStrategy.Single
};
sequentialLayout.AppendLayout(fillLayout);
if (this.state == GestureState.Finishing)
{
// only route edges for the final layout
sequentialLayout.AppendLayout(new EdgeRouter {
Scope = Scope.RouteEdgesAtAffectedNodes
});
}
}
else
{
if (resizeState == ResizeState.Both)
{
// fill the free space of the resized node
fillLayout = new FillAreaLayout {
ComponentAssignmentStrategy = ComponentAssignmentStrategy.Single
};
sequentialLayout.AppendLayout(fillLayout);
}
// clear the space of the moved/enlarged node
sequentialLayout.AppendLayout(new ClearAreaLayout {
ComponentAssignmentStrategy = ComponentAssignmentStrategy.Single,
ClearAreaStrategy = ClearAreaStrategy.Local,
ConsiderEdges = true
});
}
return(new GivenCoordinatesStage(sequentialLayout));
}
/// <summary>
/// A <see cref="LayoutExecutor"/> that is used when dragging the subtree starts.
/// </summary>
/// <remarks>
/// When the drag begins, the <see cref="FillAreaLayout"/> fills up the space that was covered by the subtree.
/// This state is the initial layout for the <see cref="ClearAreaLayout"/> during the drag.
/// </remarks>
private LayoutExecutor CreateInitializingLayoutExecutor()
{
var layout = new FillAreaLayout {
LayoutOrientation = LayoutOrientation.TopToBottom,
ComponentAssignmentStrategy = ComponentAssignmentStrategy.Customized,
Spacing = 50
};
layout.ConfigureAreaOutline(subtree.Nodes);
var layoutData = new FillAreaLayoutData {
ComponentIds = { Mapper = components },
};
// the FillAreaLayout is only applied to the part of the tree that does not belong to the subtree
IGraph filteredGraph = new FilteredGraphWrapper(graphControl.Graph, n => !subtree.Nodes.Contains(n));
return(new LayoutExecutor(graphControl, filteredGraph, layout)
{
LayoutData = layoutData,
RunInThread = true,
Duration = TimeSpan.FromMilliseconds(150)
});
}
