/// <summary>
/// Creates the default input mode for the GraphControl,
/// a <see cref="GraphEditorInputMode"/>.
/// </summary>
/// <remarks>
/// This implementation configures label text validation
/// </remarks>
/// <returns>A new GraphEditorInputMode instance</returns>
protected virtual IInputMode CreateEditorMode()
{
var graphEditorInputMode = new GraphEditorInputMode();
//Configure label text validation
// Note that by default, no visual feedback is provided, the text is just not changed
graphEditorInputMode.ValidateLabelText += delegate(object o, LabelTextValidatingEventArgs args) {
if (args.Label == pageHeader)
{
// Page header may not be empty, regardless of whether validation is enabled or not
args.Cancel = args.NewText == String.Empty;
}
else
{
// label must match the pattern
args.Cancel = validationEnabled && !validationPattern.IsMatch(args.NewText);
}
};
// The label size for the dummy label must be updated externally
graphEditorInputMode.LabelTextChanged += delegate(object o, LabelEventArgs args) {
if (args.Item == pageHeader)
{
pageHeader.AdoptPreferredSizeFromStyle();
}
};
// Instant typing requires a custom TextEditorInputMode - it's safe to use it globally, though
graphEditorInputMode.TextEditorInputMode = textEditorInputMode = new DemoTextEditorInputMode();
return(graphEditorInputMode);
}
/// <summary>Creates the label for the page header.</summary>
/// <remarks>
/// The page header is a dummy labeled that is anchored at a fixed location. FreeLabelModel allows arbitrary positioning.
/// In this case, we anchor the label to a dynamic point that always corresponds to the upper left corner of the viewport.
/// We use the ZoomInvariantLabelStyle from the tutorial to ensure we always look the same
/// </remarks>
public static SimpleLabel CreatePageHeader(GraphControl graphControl)
{
var innerLabelStyle = new DefaultLabelStyle
{
Typeface = new Typeface(new FontFamily("Arial"), FontStyles.Normal, FontWeights.Bold, FontStretches.Normal),
TextSize = 20,
BackgroundPen = Pens.Green,
TextBrush = Brushes.White,
BackgroundBrush = Brushes.Green
};
var headerLabel = new SimpleLabel(null, "Page Header", FreeLabelModel.Instance.CreateAnchored(
new DynamicViewPoint(graphControl, 5, 30)))
{
Style = new ZoomInvariantLabelStyle(innerLabelStyle)
};
// Adjust the size so that the text fits
headerLabel.AdoptPreferredSizeFromStyle();
// Since we don't have a model item for the label, we add the label's visual creator directly
// to the scene graph
var headerCanvasObject = graphControl.RootGroup.AddChild(new PageHeaderVisualCreator(headerLabel));
var pageHeaderLabelEditHelper = new PageHeaderEditLabelHelper(headerLabel, headerCanvasObject);
headerLabel.LookupImplementation = Lookups.Single <IEditLabelHelper>(pageHeaderLabelEditHelper);
return(headerLabel);
}