further work on completion panel

pdex/src/processing/mode/experimental/CompletionPanel.java

@@ -0,0 +1,144 @@
+package processing.mode.experimental;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Point;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+import javax.swing.BorderFactory;
+import javax.swing.JList;
+import javax.swing.JPopupMenu;
+import javax.swing.JTextArea;
+import javax.swing.ListSelectionModel;
+import javax.swing.SwingUtilities;
+import javax.swing.text.BadLocationException;
+
+import processing.app.syntax.JEditTextArea;
+
+public class CompletionPanel {
+  private JList list;
+
+  private JPopupMenu popupMenu;
+
+  private String subWord;
+
+  private final int insertionPosition;
+
+  private JEditTextArea textarea;
+
+  public CompletionPanel(JEditTextArea textarea, int position, String subWord,
+                         String[] items, Point location) {
+    this.textarea = textarea;
+    this.insertionPosition = position;
+    if (subWord.indexOf('.') != -1)
+      this.subWord = subWord.substring(subWord.lastIndexOf('.') + 1);
+    else
+      this.subWord = subWord;
+    popupMenu = new JPopupMenu();
+    popupMenu.removeAll();
+    popupMenu.setOpaque(false);
+    popupMenu.setBorder(null);
+    popupMenu.add(list = createSuggestionList(position, items),
+                  BorderLayout.CENTER);
+    popupMenu.show(textarea, location.x, textarea.getBaseline(0, 0)
+        + location.y);
+  }
+
+  public void hide() {
+    popupMenu.setVisible(false);
+  }
+
+  public boolean isVisible() {
+    return popupMenu.isVisible();
+  }
+
+//  private JList createSuggestionList(final int position, final String subWord) {
+//    Object[] data = new Object[10];
+//    for (int i = 0; i < data.length; i++) {
+//      data[i] = subWord + i * 10;
+//    }
+//    JList list = new JList(data);
+//    list.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
+//    list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
+//    list.setSelectedIndex(0);
+//    list.addMouseListener(new MouseAdapter() {
+//      @Override
+//      public void mouseClicked(MouseEvent e) {
+//        if (e.getClickCount() == 2) {
+//          insertSelection();
+//        }
+//      }
+//    });
+//    return list;
+//  }
+
+  public JList createSuggestionList(final int position, final String[] items) {
+
+    JList list = new JList(items);
+    list.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
+    list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
+    list.setSelectedIndex(0);
+    list.addMouseListener(new MouseAdapter() {
+      @Override
+      public void mouseClicked(MouseEvent e) {
+        if (e.getClickCount() == 2) {
+          insertSelection();
+        }
+      }
+    });
+    return list;
+  }
+
+  public boolean insertSelection() {
+    if (list.getSelectedValue() != null) {
+      try {
+        final String selectedSuggestion = ((String) list.getSelectedValue())
+            .substring(subWord.length());
+        textarea.getDocument().insertString(insertionPosition,
+                                            selectedSuggestion, null);
+        textarea.setCaretPosition(insertionPosition
+            + selectedSuggestion.length());
+        return true;
+      } catch (BadLocationException e1) {
+        e1.printStackTrace();
+      }
+      hideSuggestion();
+    }
+    return false;
+  }
+
+  public void hideSuggestion() {
+    hide();
+  }
+
+  public void moveUp() {
+    if (list.getSelectedIndex() == 0) {
+      selectIndex(list.getModel().getSize() - 1);
+    } else {
+      int index = Math.max(list.getSelectedIndex() - 1, 0);
+      selectIndex(index);
+    }
+  }
+
+  public void moveDown() {
+    if (list.getSelectedIndex() == list.getModel().getSize() - 1) {
+      selectIndex(0);
+    } else {
+      int index = Math.min(list.getSelectedIndex() + 1, list.getModel()
+          .getSize() - 1);
+      selectIndex(index);
+    }
+  }
+
+  private void selectIndex(int index) {
+    list.setSelectedIndex(index);
+//      final int position = textarea.getCaretPosition();
+//      SwingUtilities.invokeLater(new Runnable() {
+//        @Override
+//        public void run() {
+//          textarea.setCaretPosition(position);
+//        };
+//      });
+  }
+}