package ie.dcu.apps.ist.widgets;

import ie.dcu.swt.PopupComposite;

import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * Pop up control for changing brush sizes.
 * 
 * @author Kevin McGuinness
 */
public class BrushControl extends PopupComposite {
	private static final int MAX_BRUSH_SIZE = 20;

	private final Label label;
	private final Scale scale;
	
	
	public BrushControl(Shell parent, int style) {
		super(parent, style);
		
		// Create controls
		label = new Label(this, SWT.NONE);
		scale = new Scale(this, SWT.NONE);
		
		configureControls();
		configureListeners();
		layoutControls();
	}


	public void setBrushSize(int size) {
		scale.setSelection(size);
		updateLabel();
	}
	
	
	public int getBrushSize() {
		return scale.getSelection();
	}
	
	
	public void addSelectionListener(SelectionListener listener) {
		scale.addSelectionListener(listener);
	}
	
	
	public void removeSelectionListener(SelectionListener listener) {
		scale.removeSelectionListener(listener);
	}
	
	
	private void configureControls() {
		scale.setMinimum(1);
		scale.setMaximum(MAX_BRUSH_SIZE);
		scale.setIncrement(1);
		scale.setPageIncrement(2);
		setBrushSize(1);
	}


	private void configureListeners() {
		scale.addSelectionListener(new ScaleChangeListener());
	}


	private void layoutControls() {
		setLayout(new GridLayout());
		
		// Layout label
		GridData gd = new GridData();
		gd.grabExcessHorizontalSpace = true;
		gd.horizontalAlignment = SWT.FILL;
		label.setLayoutData(gd);
		
		// Layout scale control
		gd = new GridData();
		gd.grabExcessHorizontalSpace = true;
		gd.horizontalAlignment = SWT.FILL;
		gd.minimumWidth = 150;
		scale.setLayoutData(gd);
	}


	private void updateLabel() {
		int size = scale.getSelection();
		label.setText(String.format("Brush Size:  %dpx ", size));
	}


	private final class ScaleChangeListener 
		extends SelectionAdapter {
		
		public void widgetSelected(SelectionEvent e) {
			updateLabel();
		}
	};
}