tim/prune/gui/colour/ColourChooser.java

   1 package tim.prune.gui.colour;
   2
   3 import java.awt.BorderLayout;
   4 import java.awt.Color;
   5 import java.awt.Dimension;
   6 import java.awt.FlowLayout;
   7 import java.awt.event.ActionEvent;
   8 import java.awt.event.ActionListener;
   9
  10 import javax.swing.BoxLayout;
  11 import javax.swing.JButton;
  12 import javax.swing.JDialog;
  13 import javax.swing.JLabel;
  14 import javax.swing.JPanel;
  15 import javax.swing.JSlider;
  16 import javax.swing.event.ChangeEvent;
  17 import javax.swing.event.ChangeListener;
  18
  19 import tim.prune.I18nManager;
  20
  21 /**
  22  * Class to offer a dialog to choose a colour.
  23  * Normally a JColorChooser would be used, but this is too buggy
  24  * in Java 1.6 and extremely prone to thread-locking, meaning
  25  * that the application has to be killed (and all data lost).
  26  */
  27 public class ColourChooser
  28 {
  29         /** main dialog object */
  30         private JDialog _dialog = null;
  31         /** array of three slider objects for rgb */
  32         private JSlider[] _rgbSliders = null;
  33         /** array of labels for rgb values */
  34         private JLabel[] _rgbLabels = null;
  35         /** colour patch */
  36         private ColourPatch _patch = null;
  37         /** chosen colour */
  38         private Color _chosenColour = null;
  39
  40
  41         /**
  42          * Constructor
  43          * @param inParent parent dialog
  44          */
  45         public ColourChooser(JDialog inParent)
  46         {
  47                 _dialog = new JDialog(inParent, I18nManager.getText("dialog.colourchooser.title"), true);
  48                 _dialog.setLocationRelativeTo(inParent);
  49                 _dialog.getContentPane().add(makeContents());
  50                 _dialog.pack();
  51         }
  52
  53         /**
  54          * Make the dialog contents
  55          * @return JPanel containing dialog elements
  56          */
  57         private JPanel makeContents()
  58         {
  59                 JPanel mainPanel = new JPanel();
  60                 mainPanel.setLayout(new BorderLayout());
  61                 _rgbSliders = new JSlider[3];
  62                 _rgbLabels = new JLabel[3];
  63                 _patch = new ColourPatch(Color.WHITE);
  64                 JPanel centrePanel = new JPanel();
  65                 centrePanel.setLayout(new BorderLayout());
  66                 centrePanel.add(_patch, BorderLayout.CENTER);
  67
  68                 JPanel sliderPanel = new JPanel();
  69                 sliderPanel.setLayout(new BoxLayout(sliderPanel, BoxLayout.Y_AXIS));
  70                 final String[] labelKeys = {"red", "green", "blue"};
  71                 for (int i=0; i<3; i++)
  72                 {
  73                         String key = I18nManager.getText("dialog.colourchooser." + labelKeys[i]);
  74                         sliderPanel.add(new JLabel(key));
  75                         _rgbSliders[i] = new JSlider(0, 255);
  76                         _rgbSliders[i].addChangeListener(new ChangeListener() {
  77                                 public void stateChanged(ChangeEvent arg0) {
  78                                         updatePatch();
  79                                 }
  80                         });
  81                         _rgbSliders[i].setToolTipText(key);
  82                         JPanel sliderHolder = new JPanel();
  83                         sliderHolder.setLayout(new BorderLayout(5, 0));
  84                         sliderHolder.add(_rgbSliders[i], BorderLayout.CENTER);
  85                         _rgbLabels[i] = new JLabel("255");
  86                         _rgbLabels[i].setPreferredSize(new Dimension(40, 1));
  87                         sliderHolder.add(_rgbLabels[i], BorderLayout.EAST);
  88                         sliderPanel.add(sliderHolder);
  89                 }
  90                 centrePanel.add(sliderPanel, BorderLayout.SOUTH);
  91                 mainPanel.add(centrePanel, BorderLayout.CENTER);
  92
  93                 // Button panel for ok, cancel
  94                 JPanel buttonPanel = new JPanel();
  95                 buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
  96                 JButton okButton = new JButton(I18nManager.getText("button.ok"));
  97                 okButton.addActionListener(new ActionListener() {
  98                         public void actionPerformed(ActionEvent e) {
  99                                 _chosenColour = _patch.getBackground();
 100                                 _dialog.setVisible(false);
 101                         }
 102                 });
 103                 buttonPanel.add(okButton);
 104                 JButton cancelButton = new JButton(I18nManager.getText("button.cancel"));
 105                 cancelButton.addActionListener(new ActionListener() {
 106                         public void actionPerformed(ActionEvent e) {
 107                                 _chosenColour = null;
 108                                 _dialog.setVisible(false);
 109                         }
 110                 });
 111                 buttonPanel.add(cancelButton);
 112                 mainPanel.add(buttonPanel, BorderLayout.SOUTH);
 113                 return mainPanel;
 114         }
 115
 116         /**
 117          * Show the dialog to choose a colour
 118          * @param inStartColour current colour
 119          */
 120         public void showDialog(Color inStartColour)
 121         {
 122                 // Initialise sliders
 123                 _rgbSliders[0].setValue(inStartColour.getRed());
 124                 _rgbSliders[1].setValue(inStartColour.getGreen());
 125                 _rgbSliders[2].setValue(inStartColour.getBlue());
 126                 updatePatch();
 127                 _dialog.setLocationRelativeTo(_dialog.getParent());
 128                 _dialog.setVisible(true);
 129         }
 130
 131         /**
 132          * Update the patch colour from the slider values
 133          */
 134         private void updatePatch()
 135         {
 136                 for (int i=0; i<3; i++) {
 137                         _rgbLabels[i].setText("" + _rgbSliders[i].getValue());
 138                 }
 139                 final Color colour = new Color(_rgbSliders[0].getValue(),
 140                         _rgbSliders[1].getValue(),_rgbSliders[2].getValue());
 141                 _patch.setColour(colour);
 142         }
 143
 144         /**
 145          * @return the selected colour, or null if cancel pressed
 146          */
 147         public Color getChosenColour()
 148         {
 149                 return _chosenColour;
 150         }
 151 }