X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FJalviewColourChooser.java;fp=src%2Fjalview%2Fgui%2FJalviewColourChooser.java;h=6dc8a2bf10e4424164e5d806d06b3e32e3821784;hb=4f30214e8098748469c6a4269ac2ed6c5750e4b0;hp=0000000000000000000000000000000000000000;hpb=9dabc02511e3a334a5749a504f57f69d6c9017bd;p=jalview.git

diff --git a/src/jalview/gui/JalviewColourChooser.java b/src/jalview/gui/JalviewColourChooser.java
new file mode 100644
index 0000000..6dc8a2b
--- /dev/null
+++ b/src/jalview/gui/JalviewColourChooser.java
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+package jalview.gui;
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.event.ActionListener;
+
+import javax.swing.JColorChooser;
+import javax.swing.JComponent;
+import javax.swing.JDialog;
+
+/**
+ * A helper class that shows a JColorChooser and passes the selected colour back
+ * to a listener
+ */
+public class JalviewColourChooser
+{
+  public interface ColourChooserListener
+  {
+    void colourSelected(Color c);
+    
+    default void cancel() {};
+  }
+
+  /**
+   * Shows a colour chooser dialog with the given parent component, title, and
+   * (optionally) initially selected colour. The chosen colour is passed back to
+   * the listener. There is no action if the dialog is cancelled.
+   * 
+   * @param parent
+   * @param title
+   * @param initialColour
+   * @param listener
+   */
+  public static void showColourChooser(Component parent, String title,
+          Color initialColour, ColourChooserListener listener)
+  {
+    JColorChooser colorChooser = new JColorChooser();
+    if (initialColour != null)
+    {
+      colorChooser.setColor(initialColour);
+    }
+    ActionListener onChoose = evt -> listener.colourSelected(colorChooser.getColor());
+    ActionListener onCancel = evt -> listener.cancel();
+	JDialog dialog = JColorChooser.createDialog(parent, title, true, colorChooser,
+		onChoose, onCancel);
+	dialog.setVisible(true);
+  }
+
+  /**
+   * A convenience method that shows a colour chooser, with initial colour the
+   * background of the given 'paintable', and updates its background colour and
+   * repaints it after a colour selection is made
+   * 
+   * @param parent
+   * @param title
+   * @param paintable
+   */
+  public static void showColourChooser(Component parent, String title,
+          JComponent paintable)
+  {
+    ColourChooserListener listener = new ColourChooserListener()
+    {
+      @Override
+      public void colourSelected(Color c)
+      {
+        paintable.setBackground(c);
+        paintable.repaint();
+      }
+    };
+    JalviewColourChooser.showColourChooser(parent, title,
+            paintable.getBackground(), listener);
+  }
+}