EnterCenterTyping.java

package org.geepawhill.whiteboard.action;

import javafx.animation.Transition;
import javafx.geometry.Bounds;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextAlignment;
import javafx.util.Duration;

public class EnterCenterTyping extends AbstractAction
{
	private Text text;
	String value;
	private double startX;
	private double startY;
	
	///////////////
	// This is mid-refactoring. Every AbstractAction has a transition member. I was just about to make that "transition=" line into
	// super(transition). But there are AbstractAction-to-be's (in about five more minutes) that can't make their transition in advance, 
	// because the transition depends on parameters (like duration but there are others) that aren't known until runtime.
	///////////////

	public EnterCenterTyping(BorderPane root, String id, String value, double startX, double startY)
	{
		this.value = value;
		this.startX = startX;
		this.startY = startY;
		this.duration = new Duration(value.length()*150);
		makeNodes(root,id);
		transition = makeTransition();

	}

	private Transition makeTransition()
	{
		return new Transition()
		{
			{
				setCycleDuration(duration);
			}

			@Override
			protected void interpolate(double frac)
			{
				if(frac==0.0) showNodes();
				else animateNodes(frac);
			}
		};
	}

	protected void showNodes()
	{
		text.setVisible(true);
	}

	private void makeNodes(Pane root, String id)
	{
		this.text = new Text(startX,startY,"");
		text.setVisible(false);
		text.setId(id);
		text.setStroke(Color.RED);
		text.setStrokeWidth(2);
		text.setOpacity(.4d);
		text.setFont(new Font("Viner Hand ITC",30d));
		text.setTextAlignment(TextAlignment.CENTER);
		root.getChildren().add(text);
	}

	private void animateNodes(double frac)
	{
		String partialValue = value.substring(0, (int) (frac*value.length()));
		text.setText(partialValue);
		Bounds bounds = text.getBoundsInLocal();
		text.setX(this.startX-bounds.getWidth()/2);
	}

}