FilterPane.java

package GUI;

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

import VideoState.DrawTextFilter;
import VideoState.Filter;
import VideoState.Flip;
import VideoState.VideoState;

/**
 * JPanel containing all Filters that can be configured by the user.
 */
public class FilterPane extends JPanel {

    private VideoState state;

    private JPanel _listPane;
    private JPanel _newFilterPane;
    private JPanel _filterEditorPane;
    private CardLayout _filterEditorPaneLayout;
    private JList<FilterInstancePane> _filterList;
    private DefaultListModel<FilterInstancePane> _filterListModel;
    private JComboBox<String> _newFilterChooser;
    private String[] _filters = {"Text Overlay", "Flip"};
    private JButton _addFilter;
    private JButton _removeFilter;
    private VideoPlayerInterface _player;

    /**
     * @param player A videoplayer so that filters can get info about the position
     * and time of the video
     * @param state The video state to be edited
     */
    public FilterPane(VideoState state, VideoPlayerInterface player){
        this.state = state;
        _player = player;
        setLayout(new BorderLayout());
        setPreferredSize(new Dimension(800,200));

        _listPane = new JPanel();
        _listPane.setLayout(new BorderLayout());

        _filterListModel = new DefaultListModel<FilterInstancePane>();
        _filterList = new JList<FilterInstancePane>(_filterListModel);
        _filterList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        _filterList.addListSelectionListener(new ListSelectionListener(){
			public void valueChanged(ListSelectionEvent e) {
	            FilterInstancePane filter = _filterList.getSelectedValue();
	            if (filter != null)
	                _filterEditorPaneLayout.show(_filterEditorPane, "" + filter.getIdentifier());
			}});
        _listPane.add(_filterList, BorderLayout.CENTER);

        _newFilterPane = new JPanel();
        _newFilterChooser = new JComboBox<String>(_filters);
        _newFilterPane.add(_newFilterChooser, BorderLayout.PAGE_END);

        _addFilter = new JButton("Add filter");
        _addFilter.addActionListener(new ActionListener() {
        	public void actionPerformed(ActionEvent e){
	            Object selected = _newFilterChooser.getModel().getSelectedItem();
	            if (selected.equals("Text Overlay")){
                    newFilter(new DrawTextFilter());
	            } else if (selected.equals("Flip")){
                    newFilter(new Flip());
	            }
        	}});
        _newFilterPane.add(_addFilter, BorderLayout.PAGE_END);

        _removeFilter = new JButton("Remove selected filter");
        _removeFilter.addActionListener(new ActionListener(){
        	public void actionPerformed(ActionEvent e){
	            FilterInstancePane filter = _filterList.getSelectedValue();
	            if (filter != null){
	                _filterEditorPaneLayout.removeLayoutComponent(filter);
	                _filterListModel.removeElement(filter);
                    state.removeFilter(filter.getModel());
                }
        	}});

        _listPane.add(_removeFilter, BorderLayout.PAGE_END);
        _listPane.add(_newFilterPane, BorderLayout.PAGE_START);

        add(_listPane, BorderLayout.LINE_START);

        _filterEditorPane = new JPanel();
        _filterEditorPaneLayout = new CardLayout();
        _filterEditorPane.setLayout(_filterEditorPaneLayout);
        add(_filterEditorPane, BorderLayout.CENTER);
    }

    /**
     * Adds filter to GUI, without adding to state object. Ideal for loading
     * filters from state
     */
    private void addFilterToGui(Filter filter){
        FilterInstancePane fip = null;
        if (filter instanceof DrawTextFilter)
            fip = new TextOverlayPane((DrawTextFilter) filter, _player);
        if (filter instanceof Flip)
            fip = new FlipPane((Flip) filter);
        addFilterPane(fip);
    }

    /**
     * Addes a new filter to the GUI and state
     */
    private void newFilter(Filter filter){
        state.addFilter(filter);
        addFilterToGui(filter);
    }

    private void addFilterPane(FilterInstancePane filterPane){
        //Add pane with a unique, identifiable name
        _filterEditorPane.add(filterPane, "" + filterPane.getIdentifier());
        _filterListModel.addElement(filterPane);
    }

    /**
     * Removes all filters from the list. Does not remove from state
     */
    private void clearFilterPanes(){
        _filterListModel.removeAllElements();
        _filterEditorPane.removeAll();
    }

    public void updateFromState(){
        clearFilterPanes();
        if (state.get_filters() != null){
            for (Filter f : state.get_filters())
                addFilterToGui(f);
        }
    }
}