/// <summary>
/// Creates the visual for the label.
/// </summary>
/// <remarks>
/// Implementation of LabelStyleBase.CreateVisual.
/// </remarks>
/// <param name="context">The render context.</param>
/// <param name="label">The label to which this style instance is assigned.</param>
/// <returns>The visual as required by the <see cref="IVisualCreator.CreateVisual"/> interface.</returns>
protected override VisualGroup CreateVisual(IRenderContext context, ILabel label)
{
// Updates the dummy label which is internally used for rendering with the properties of the given label.
UpdateDummyLabel(context, label);
// creates the container for the visual and sets a transform for view coordinates
var container = new VisualGroup();
// ReSharper disable once PossibleUnintendedReferenceComparison
if (container.Transform != context.IntermediateTransform)
{
container.Transform = context.IntermediateTransform;
}
RenderDataCache cache = CreateRenderDataCache(context, label);
container.SetRenderDataCache(cache);
var creator = InnerLabelStyle.Renderer.GetVisualCreator(dummyLabel, InnerLabelStyle);
// create a new IRenderContext with a zoom of 1
var cc = new ContextConfigurator(context.CanvasControl.ContentRect);
var innerContext = cc.CreateRenderContext(context.CanvasControl);
//The wrapped style should always think it's rendering with zoom level 1
var visual = creator.CreateVisual(innerContext);
if (visual == null)
{
return(container);
}
// add the created visual to the container
container.Children.Add(visual);
// if the label is selected, add the selection visualization, too.
if (cache.Selected)
{
UIElement selectionVisual = CreateSelectionVisual(innerContext, dummyLabel.GetLayout()) as UIElement;
if (selectionVisual != null)
{
selectionVisual.IsHitTestVisible = false;
}
container.Children.Add(selectionVisual);
}
return(container);
}
protected override VisualGroup CreateVisual(IRenderContext context, ILabel label)
{
// Updates the dummy label which is internally used for rendering with the properties of the given label.
UpdateDummyLabel(context, label);
// creates the container for the visual and sets a transform for view coordinates
var container = new VisualGroup();
var toViewTransform = context.WorldTransform.Clone();
toViewTransform.Invert();
// ReSharper disable once PossibleUnintendedReferenceComparison
if (container.Transform != toViewTransform)
{
container.Transform = toViewTransform;
}
var creator = InnerLabelStyle.Renderer.GetVisualCreator(dummyLabel, InnerLabelStyle);
// create a new IRenderContext with a zoom of 1
// TODO: Projections
var innerContext = new RenderContext(context.Graphics, context.CanvasControl)
{
ViewTransform = context.ViewTransform, WorldTransform = context.WorldTransform, Zoom = 1
};
//The wrapped style should always think it's rendering with zoom level 1
var visual = creator.CreateVisual(innerContext);
if (visual == null)
{
return(container);
}
// add the created visual to the container
container.Children.Add(visual);
IGraphSelection selection = context.CanvasControl != null?context.CanvasControl.Lookup <IGraphSelection>() : null;
bool selected = selection != null && selection.IsSelected(label);
// if the label is selected, add the selection visualization, too.
if (selected)
{
//The selection descriptor performs its own calculation in the view coordinate system, so
//the size and the position of the visualization would be wrong and need to be converted back into world
//coordinates
var layout = dummyLabel.GetLayout();
var p1 = context.CanvasControl.ToWorldCoordinates(layout.GetAnchorLocation());
var selectionLayout = new OrientedRectangle
{
Anchor = p1,
Width = layout.Width / context.Zoom,
Height = layout.Height / context.Zoom
};
selectionLayout.SetUpVector(layout.UpX, layout.UpY);
var selectionVisual = new OrientedRectangleIndicatorInstaller().Template;
container.Children.Add(selectionVisual);
}
return(container);
}
