nt.UI/src/nt/UI/control/JSearchBarController.java

package nt.UI.control;

import java.awt.Font;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.HierarchyBoundsListener;
import java.awt.event.HierarchyEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;


public class JSearchBarController extends KeyAdapter implements DocumentListener, FocusListener, ComponentListener, HierarchyBoundsListener, ListSelectionListener{

	private static final String COMPLETION_CANCEL_KEY = "comp.cancel";
	
	private static final KeyStroke COMPLETION_CANCEL_STROKE = KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0);
	
	private JSearchBar searchBar;
	
	protected JSearchBarController(JSearchBar searchBar) {
		this.searchBar = searchBar;
		
		searchBar.txtSearch.addFocusListener(this);
		searchBar.txtSearch.addKeyListener(this);
		searchBar.txtSearch.getDocument().addDocumentListener(this);
		InputMap inputMap = searchBar.txtSearch.getInputMap();
		inputMap.put(COMPLETION_CANCEL_STROKE, COMPLETION_CANCEL_KEY);
		
		ActionMap actionMap = searchBar.txtSearch.getActionMap();
		actionMap.put(COMPLETION_CANCEL_KEY, new AbstractAction() {
			private static final long serialVersionUID = 1L;
			@Override
			public void actionPerformed(ActionEvent e) {
				setDefaultState();
			}
		});
		
		searchBar.txtSearch.addComponentListener(this);
		searchBar.txtSearch.addHierarchyBoundsListener(this);
		searchBar.addActionListener(e -> setDefaultState());
		
		searchBar.dropDown.list.addListSelectionListener(this);
		
	}
	
	protected void setDefaultState() {
		JTextField txt = this.searchBar.txtSearch;
		this.searchBar.showCancelButton(false);
		txt.setText("search");
		txt.setFont(txt.getFont().deriveFont(Font.ITALIC));
		this.searchBar.repaint();
		this.searchBar.stopCompletion();
		Window win = SwingUtilities.getWindowAncestor(searchBar);
		if(win != null) {
			win.requestFocus();
		}
	}
	protected void setEnteredState() {
		JTextField txt = this.searchBar.txtSearch;
		this.searchBar.showCancelButton(true);
		txt.setFont(txt.getFont().deriveFont(Font.PLAIN));
	}

	@Override
	public void focusGained(FocusEvent e) {
		JTextField bar = this.searchBar.txtSearch;
		if(bar.getText().toLowerCase().equals("search")) {
			bar.setText("");
		}
		setEnteredState();
	}

	@Override
	public void focusLost(FocusEvent e) {
		JTextField bar = this.searchBar.txtSearch;
		if(bar.getText().isEmpty() || bar.getText().toLowerCase().equals("search")) {
			setDefaultState();
		}else {
			setEnteredState();
		}
		this.searchBar.stopCompletion();	
	}
	
	@Override
	public void keyPressed(KeyEvent e) {
		if(this.searchBar.completionActive) {
			JList<String> list = searchBar.dropDown.list;
			int index = list.getSelectedIndex();
			if(e.getKeyCode() == KeyEvent.VK_DOWN) {
				index = index >= list.getModel().getSize()? list.getModel().getSize()-1:++index;
			}else if(e.getKeyCode() == KeyEvent.VK_UP) {
				index = index <= -1? -1 : --index;
			}
			list.setSelectedIndex(index);
			list.ensureIndexIsVisible(index);
			
			if(e.getKeyCode()==KeyEvent.VK_ENTER) {
				searchBar.txtSearch.setText(list.getSelectedValue());
				searchBar.finder.acceptedResult(list.getSelectedValue());
			}
		}
	}
	
	@Override
	public void componentResized(ComponentEvent e) {
		if(this.searchBar.completionActive) {
			this.searchBar.dropDown.positionMenu();
		}
	}

	@Override
	public void componentMoved(ComponentEvent e) {
		if(this.searchBar.completionActive) {
			this.searchBar.dropDown.positionMenu();
		}
	}

	@Override
	public void componentShown(ComponentEvent e) {
		
	}

	@Override
	public void componentHidden(ComponentEvent e) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void ancestorMoved(HierarchyEvent e) {
		if(this.searchBar.completionActive) {
			this.searchBar.stopCompletion();
		}
	}

	@Override
	public void ancestorResized(HierarchyEvent e) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void valueChanged(ListSelectionEvent e) {
//		String val = searchBar.dropDown.list.getSelectedValue();
//		if(val != null) {
//			JTextField field = searchBar.txtSearch;
//			field.setText(val);
//			field.setCaretPosition(field.getText().length());
//		}
		
	}

	@Override
	public void insertUpdate(DocumentEvent e) {
		if(searchBar.txtSearch.getDocument().getLength() > 0) {
			if(!searchBar.completionActive) {
				searchBar.startCompletion();
			}
			searchBar.doCompletion();
		}else {
			searchBar.stopCompletion();
		}
	}

	@Override
	public void removeUpdate(DocumentEvent e) {
		searchBar.doCompletion();
		
	}

	@Override
	public void changedUpdate(DocumentEvent e) {
		// TODO Auto-generated method stub
		
	}


}