java-app-qs/src/main/java/de/synolo/app/qs/editor/EditorControl.java

package de.synolo.app.qs.editor;

import de.synolo.lib.fw.utils.Logging;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;

public class EditorControl {

	private EditorCanvas editor;
	private ItemFactory itemFactory;
	
	private double 	dragX, dragY,
					offsetX = 0, offsetY = 0;
	private DoubleProperty zoomProperty = new SimpleDoubleProperty(1.0);
	private DoubleProperty 	zoomFactorProperty = new SimpleDoubleProperty(0.05),
			maxZoomProperty = new SimpleDoubleProperty(10),
			minZoomProperty = new SimpleDoubleProperty(0.05);
	
	private ItemNode selectedNode = null;
	
	public EditorControl(EditorCanvas editor) {
		this.editor = editor;
		editor.setOnScroll(this::onScroll);
		editor.setOnMouseClicked(this::onMouseClicked);
		editor.setOnMousePressed(this::onMousePressed);
		editor.setOnMouseReleased(this::onMouseReleased);
		editor.setOnMouseDragged(this::onMouseDragged);
	}
	
	public DoubleProperty zoomProperty() { return this.zoomProperty; }
	public double getZoom() { return this.zoomProperty.get(); }
	public void setZoom(double zoom) { this.zoomProperty.set(zoom); }
	
	public DoubleProperty zoomFactorProperty() { return this.zoomFactorProperty; }
	public double getZoomFactor() { return this.zoomFactorProperty.get(); }
	public void setZoomFactor(double factor) { this.zoomFactorProperty.set(factor); }
	
	public DoubleProperty zoomMaxProperty() { return this.maxZoomProperty; }
	public double getZoomMax() { return this.maxZoomProperty.get(); }
	public void setZoomMax(double max) { this.maxZoomProperty.set(max); }
	
	public DoubleProperty zoomMinProperty() { return this.minZoomProperty; }
	public double getZoomMin() { return this.minZoomProperty.get(); }
	public void setZoomMin(double min) { this.minZoomProperty.set(min); }
	
	double getOffsetX() { return this.offsetX; }
	double getOffsetY() { return this.offsetY; }
	
	public double getWorldX(double screenX) {
		return (screenX / getZoom()) + this.offsetX;
	}
	public double getWorldY(double screenY) {
		return (screenY / getZoom()) + this.offsetY;
	}
	public double getScreenX(double worldX) {
		return (worldX - this.offsetX) * getZoom();
	}
	public double getScreenY(double worldY) {
		return (worldY - this.offsetY) * getZoom();
	}
	
	public EditorCanvas getEditor() { return this.editor; }
	public ItemFactory getItemFactory() { return this.itemFactory; }
	public void setItemFactory(ItemFactory factory) { this.itemFactory = factory; }
	
	private void onScroll(ScrollEvent e) {
		double scale = getZoom();
		if(e.getDeltaY() > 0) {
			scale *= (1.0 + getZoomFactor());
		}else {
			scale *= (1.0 - getZoomFactor());				
		}
		
		scale = scale >= getZoomMax() ? getZoomMax() :
				scale <= getZoomMin() ? getZoomMin() :
				scale;
				
		double 	xBefore = getWorldX(e.getX()),
				yBefore = getWorldY(e.getY());
		setZoom(scale);
		double 	xAfter = getWorldX(e.getX()),
				yAfter = getWorldY(e.getY());
		this.offsetX += (xBefore - xAfter);
		this.offsetY += (yBefore - yAfter);
		
		editor.paint();
	}
	
	private void onMouseClicked(MouseEvent e) {
		if(e.isConsumed()) 
			return;
	}
	
	private void onMousePressed(MouseEvent e) {
		if(e.getButton() == MouseButton.MIDDLE) {
			this.dragX = e.getX();
			this.dragY = e.getY();
			this.editor.setState(EditorState.PANNING);
		}
		
		double 	worldX = getWorldX(e.getX()),
				worldY = getWorldY(e.getY());
		
		switch(this.editor.getState()) {
			case EDITING:
				break;
			case INSERTING:
				if(this.itemFactory != null) {
					EditorLayer layer = this.editor.getLayerSelectionModel().getSelectedItems().get(0);
					if(layer != null) {
						EditorItem item = this.itemFactory.createItem();
						item.setSelected(true);
						this.selectedNode = item.nextNode(worldX, worldY);
						if(this.selectedNode != null) {
							this.editor.setState(EditorState.EDITING);
						}
						layer.getItems().add(item);
						System.out.println("add item");
					}else {
						Logging.out.warn("No Layer selected!");
					}
				}
				break;
			case PANNING:
				break;
			case ZOOMING:
				break;
			default:
				break;
		}
	}
	
	private void onMouseReleased(MouseEvent e) {
		EditorState state = EditorState.INSERTING;
		switch(this.editor.getState()) {
			case EDITING:
			case INSERTING:
			case PANNING:
			case ZOOMING:
		}
		this.editor.setState(state);
		this.selectedNode = null;
	}
	
	private void onMouseDragged(MouseEvent e) {
		double 	worldX = getWorldX(e.getX()),
				worldY = getWorldY(e.getY());
		
		switch(this.editor.getState()) {
			case EDITING:
				if(this.selectedNode != null) {
					this.selectedNode.setX(worldX);
					this.selectedNode.setY(worldY);
					this.editor.paint();
				}
				break;
			case INSERTING:
				break;
			case PANNING:
				break;
			case ZOOMING:
				break;
			default:
				break;
		}
		
		if(e.getButton() == MouseButton.MIDDLE) {
			this.offsetX -= (e.getX() - this.dragX) / getZoom();
			this.offsetY -= (e.getY() - this.dragY) / getZoom();
			this.dragX = e.getX();
			this.dragY = e.getY();
			this.editor.paint();
		}
	}
	
}