Ticket #15414: v2-0001-add-PopupMenuButton-a-button-for-triggering-the-appe.patch

new file src/org/openstreetmap/josm/gui/widgets/PopupMenuButton.java

@@ +1 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.widgets;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.event.ActionListener;
+import java.awt.event.ActionEvent;
+import java.awt.geom.Path2D;
+
+import javax.swing.Action;
+import javax.swing.Icon;
+import javax.swing.JButton;
+import javax.swing.JPopupMenu;
+
+
+/**
+ * Button triggering the appearance of a JPopupMenu when activated
+ */
+public class PopupMenuButton extends JButton implements ActionListener {
+    private JPopupMenu menu;
+
+    /**
+     * @see JButton#JButton()
+     */
+    public PopupMenuButton() {
+        super();
+        this.initialize();
+    }
+
+    /**
+     * @see JButton#JButton(Action)
+     */
+    public PopupMenuButton(Action a) {
+        super(a);
+        this.initialize();
+    }
+
+    /**
+     * @see JButton#JButton(Icon)
+     */
+    public PopupMenuButton(Icon i) {
+        super(i);
+        this.initialize();
+    }
+
+    /**
+     * @see JButton#JButton(String)
+     */
+    public PopupMenuButton(String t) {
+        super(t);
+        this.initialize();
+    }
+
+    /**
+     * @see JButton#JButton(String, Icon)
+     */
+    public PopupMenuButton(String t, Icon i) {
+        super(t, i);
+        this.initialize();
+    }
+
+    /**
+     * Pass-through to {@link JButton#JButton()} allowing associated popup menu to be set
+     */
+    public PopupMenuButton(JPopupMenu m) {
+        super();
+        this.initialize(m);
+    }
+
+    /**
+     * Pass-through to {@link JButton#JButton(Action)} allowing associated popup menu to be set
+     */
+    public PopupMenuButton(Action a, JPopupMenu m) {
+        super(a);
+        this.initialize(m);
+    }
+
+    /**
+     * Pass-through to {@link JButton#JButton(Icon)} allowing associated popup menu to be set
+     */
+    public PopupMenuButton(Icon i, JPopupMenu m) {
+        super(i);
+        this.initialize(m);
+    }
+
+    /**
+     * Pass-through to {@link JButton#JButton(String)} allowing associated popup menu to be set
+     */
+    public PopupMenuButton(String t, JPopupMenu m) {
+        super(t);
+        this.initialize(m);
+    }
+
+    /**
+     * Pass-through to {@link JButton#JButton(String, Icon)} allowing associated popup menu to be set
+     */
+    public PopupMenuButton(String t, Icon i, JPopupMenu m) {
+        super(t, i);
+        this.initialize(m);
+    }
+
+    private void initialize(JPopupMenu m) {
+        this.menu = m;
+        this.initialize();
+    }
+
+    private void initialize() {
+        this.addActionListener(this);
+    }
+
+    /**
+     * Get the popup menu associated with this button
+     */
+    public JPopupMenu getPopupMenu() {
+        return this.menu;
+    }
+
+    /**
+     * Set the popup menu associated with this button
+     * @param m Menu to show when button is triggered
+     */
+    public void setPopupMenu(JPopupMenu m) {
+        this.menu = m;
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        this.menu.show(this, 0, this.getHeight());
+    }
+
+    @Override
+    public void paint(Graphics g) {
+        super.paint(g);
+        Graphics2D g2d = (Graphics2D) g;
+
+        //
+        // paint small arrow in bottom right corner
+        //
+        Dimension size = this.getSize();
+
+        Path2D p = new Path2D.Float();
+        p.moveTo(size.getWidth() - 7, size.getHeight() - 4);
+        p.lineTo(size.getWidth() - 1, size.getHeight() - 4);
+        p.lineTo(size.getWidth() - 4, size.getHeight() - 1);
+        p.closePath();
+
+        g2d.setPaint(Color.BLACK);
+        g2d.fill(p);
+    }
+}