Added listeners to numbering pane.

Signed-off-by: weisj <weisj@arcor.de>

src/main/java/com/github/weisj/darklaf/components/text/IconListener.java

@@ -0,0 +1,32 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2019 Jannis Weis
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package com.github.weisj.darklaf.components.text;
+
+import java.awt.event.MouseEvent;
+import java.util.EventListener;
+
+public interface IconListener extends EventListener {
+
+    void iconClicked(final MouseEvent e);
+}

src/main/java/com/github/weisj/darklaf/components/text/NumberingPane.java

@@ -28,6 +28,7 @@ import javax.swing.text.BadLocationException;
 import javax.swing.text.JTextComponent;
 import javax.swing.text.Position;
 import javax.swing.text.Segment;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
@@ -38,9 +39,11 @@ public class NumberingPane extends JComponent {
 
     private JTextComponent textComponent;
     private Map<Position, Icon> iconMap;
+    private Map<Position, List<IconListener>> listenerMap;
 
     public NumberingPane() {
         iconMap = new HashMap<>();
+        listenerMap = new HashMap<>();
         updateUI();
     }
 
@@ -96,6 +99,54 @@ public class NumberingPane extends JComponent {
         return addIconAtOffset(offset, icon);
     }
 
+    public void addIconListener(final int offset, final IconListener listener) throws BadLocationException {
+        if (textComponent == null) return;
+        addIconListener(textComponent.getDocument().createPosition(offset), listener);
+    }
+
+    public void addIconListener(final Position position, final IconListener listener) {
+        if (!listenerMap.containsKey(position)) {
+            listenerMap.put(position, new ArrayList<>());
+        }
+        var list = listenerMap.get(position);
+        list.add(listener);
+    }
+
+    public void removeIconListener(final int offset, final IconListener listener) throws BadLocationException {
+        if (textComponent == null) return;
+        removeIconListener(textComponent.getDocument().createPosition(offset), listener);
+    }
+
+    public void removeIconListener(final Position position, final IconListener listener) {
+        var list = listenerMap.get(position);
+        if (list != null) {
+            list.remove(listener);
+        }
+    }
+
+    public List<IconListener> getIconListeners(final int offset) throws BadLocationException {
+        if (textComponent == null) return List.of();
+        return getIconListeners(textComponent.getDocument().createPosition(offset));
+    }
+
+    public List<IconListener> getIconListeners(final Position position) {
+        var list = listenerMap.get(position);
+        return list != null ? list : List.of();
+    }
+
+    public List<IconListener> getIconListeners(final int startOffset, final int endOffset) {
+        return listenerMap.entrySet().stream()
+                          .filter(entry -> {
+                              var p = entry.getKey();
+                              return p.getOffset() >= startOffset && p.getOffset() <= endOffset;
+                          })
+                          .map(Map.Entry::getValue)
+                          .flatMap(List::stream)
+                          .collect(Collectors.toList());
+    }
+
+
+
     public Position addIconAtOffset(final int offset, final Icon icon) throws BadLocationException {
         var doc = textComponent.getDocument();
         var pos = doc.createPosition(offset);

src/main/java/com/github/weisj/darklaf/ui/numberingpane/DarkNumberingPaneUI.java

@@ -251,12 +251,13 @@ public class DarkNumberingPaneUI extends ComponentUI {
                         int x = OUTER_PAD + PAD + textWidth;
                         int y = lineRect.y + lineRect.height / 2 - h / 2;
                         if (p.x >= x && p.y >= y && p.y <= y + h) {
-                            System.out.println("clicked icon" + start);
-                            return;
+                            var list = numberingPane.getIconListeners(startOffset, endOffset);
+                            for (var listener : list) {
+                                listener.iconClicked(e);
+                            }
                         }
                     } catch (BadLocationException ignored) { }
                 }
-                System.out.println("clicked line: " + start);
             }
         }