draggablecomponent.java

修正了jdk1.6中对托盘事件产生异常的bug.

    if (enabled && mousePressed) {
      Point p = SwingUtilities.convertPoint((JComponent) e.getSource(), e.getPoint(), component);
      if (dragStarted || enableInsideDrag || !component.contains(p)) {
        if (reorderEnabled)
          doDrag(p);
        else
          dragStarted = true;

        fireDraggedEvent(EventUtil.convert(e, component, p));
      }
    }
  }

  private void dragCompleted(MouseEvent e) {
    mousePressed = false;
    dragStarted = false;

    KeyboardFocusManager.getCurrentKeyboardFocusManager().removeKeyEventDispatcher(abortDragKeyDispatcher);

    if (e == null) {
      restoreComponentOrder();
      fireNotDroppedEvent();
    }
    else if (!checkParentContains(
        SwingUtilities.convertPoint((JComponent) e.getSource(), e.getPoint(), component.getParent()))) {
      restoreComponentOrder();
      fireDroppedEvent(EventUtil.convert(e, component));
    }
    else {
      fireDroppedEvent(EventUtil.convert(e, component));
      //if (component.contains(p))
      if (!selectOnMousePress && !e.isShiftDown())
        fireSelectedEvent();
    }

    fireChangedEvent(DraggableComponentEvent.TYPE_RELEASED);
  }

  private void updateParent() {
    if (component.getParent() != null) {
      ComponentUtil.validate(component.getParent());
      //component.getParent().repaint();
    }
  }

  private void doDrag(Point p) {
    dragStarted = true;
    JComponent parent = (JComponent) component.getParent();

    if (parent.getComponentCount() == 1)
      return;

    Point p2 = SwingUtilities.convertPoint(component, p, parent);
    int toIndex = getMoveComponentIndex(p2);
    if (toIndex != -1) {
      toIndex = Math.min(toIndex, parent.getComponentCount() - 1);
      Component fromComponent = getComponent(parent, dragIndex);
      int fromDimension;
      int toPos;
      int toDimension;

      if (isVerticalDrag()) {
        fromDimension = fromComponent.getHeight();
        toPos = (int) SwingUtilities.convertPoint(parent, p2, getComponent(parent, toIndex)).getY();
        toDimension = getComponent(parent, toIndex).getHeight();
      }
      else {
        fromDimension = fromComponent.getWidth();
        toPos = (int) SwingUtilities.convertPoint(parent, p2, getComponent(parent, toIndex)).getX();
        toDimension = getComponent(parent, toIndex).getWidth();
      }

      if ((toIndex > dragIndex && toDimension - toPos > fromDimension) ||
          ((dragIndex == -1 || toIndex < dragIndex) && toPos > fromDimension))
        return;

      if (dragIndex != -1 && dragIndex != toIndex) {
        removeComponent(parent, fromComponent, dragIndex);
        addComponent(parent, fromComponent, toIndex);
        fireChangedEvent(DraggableComponentEvent.TYPE_MOVED);
      }
    }

    if (toIndex < 0) {
      restoreComponentOrder();
    }
    else
      dragIndex = toIndex;
  }

  private boolean isVerticalDrag() {
    JComponent parent = (JComponent) component.getParent();
    if (parent.getComponentCount() > 1)
      return getComponent(parent, 0).getY() < getComponent(parent, 1).getY();

    return false;
  }

  private boolean checkParentContains(Point p) {
    if (outerParentArea == null)
      return component.getParent().contains(p);

    Point p2 = SwingUtilities.convertPoint(component.getParent(), p, outerParentArea);
    if (detectOuterAreaAsLine) {
      Insets i = new Insets(0, 0, 0, 0);//outerParentArea.getInsets();
      return component.getParent().contains(p)
             ||
             (outerParentArea.contains(p2) &&
              (isVerticalDrag()
               ?
               (p2.getX() >= i.left && p2.getX() < (outerParentArea.getWidth() - i.right))
               :
               (p2.getY() >= i.top && p2.getY() < (outerParentArea.getHeight() - i.bottom))));
    }

    return component.getParent().contains(p) || outerParentArea.contains(p2);
  }

  private int getMoveComponentIndex(Point p) {
    JComponent parent = (JComponent) component.getParent();
    if (checkParentContains(p)) {
      boolean vertical = isVerticalDrag();
      for (int i = 0; i < parent.getComponentCount() - 1; i++) {
        Point p2 = getComponent(parent, i + 1).getLocation();

        if (vertical) {
          if (p.getY() >= 0 && p.getY() < p2.getY())
            return i;
        }
        else {
          if (p.getX() >= 0 && p.getX() < p2.getX())
            return i;
        }
      }

      if (dragIndex == -1)
        return parent.getComponentCount();
      else if (vertical)
        return p.getY() < 0 ? 0 : parent.getComponentCount() - 1;
      else
        return p.getX() < 0 ? 0 : parent.getComponentCount() - 1;
    }

    return -1;
  }

  private JComponent getComponent(Container parent, int index) {
    if (layoutOrderList != null)
      return (JComponent) layoutOrderList.get(index);

    return (JComponent) parent.getComponent(index);
  }

  private int getComponentIndex(Component c) {
    if (layoutOrderList != null)
      return layoutOrderList.indexOf(c);

    return ComponentUtil.getComponentIndex(c);
  }

  private void addComponent(Container parent, Component c, int index) {
    if (layoutOrderList != null) {
      layoutOrderList.add(index, c);
      parent.add(c, index);
    }
    else
      parent.add(c, index);

    revalidateComponentTree((JComponent) c);
  }

  private void removeComponent(Container parent, Component c, int index) {
    revalidateComponentTree((JComponent) c);

    if (layoutOrderList != null)
      if (index < 0) {
        layoutOrderList.remove(c);
        parent.remove(c);
      }
      else {
        Component tmp = (Component) layoutOrderList.get(index);
        layoutOrderList.remove(index);
        parent.remove(tmp);
      }
    else if (index < 0)
      parent.remove(c);
    else
      parent.remove(index);
  }

  private void revalidateComponentTree(JComponent c) {
    Container parent = c.getParent();
    int index = ComponentUtil.getComponentIndex(c);
    if (index > 0)
      doRevalidateComponentTree((JComponent) parent.getComponent(index - 1));
    doRevalidateComponentTree(c);
    if (index < parent.getComponentCount() - 1)
      doRevalidateComponentTree((JComponent) parent.getComponent(index + 1));
  }

  private void doRevalidateComponentTree(JComponent c) {
    c.revalidate();
    int count = c.getComponentCount();
    for (int i = 0; i < count; i++)
      doRevalidateComponentTree(((JComponent) c.getComponent(i)));
  }

  private void restoreComponentOrder() {
    if (reorderEnabled && dragIndex != -1 && dragFromIndex != -1 && dragIndex != dragFromIndex) {
      Container parent = component.getParent();
      Component comp = getComponent(parent, dragIndex);
      removeComponent(parent, comp, -1);
      dragIndex = dragFromIndex;
      addComponent(parent, comp, dragIndex);
      fireChangedEvent(DraggableComponentEvent.TYPE_MOVED);
    }
  }

  private void fireChangedEvent(int type) {
    updateParent();

    if (listeners != null) {
      DraggableComponentEvent event = new DraggableComponentEvent(this, type);
      Object[] l = listeners.toArray();
      for (int i = 0; i < l.length; i++)
        ((DraggableComponentListener) l[i]).changed(event);
    }
  }

  private void fireSelectedEvent() {
    updateParent();

    if (listeners != null) {
      DraggableComponentEvent event = new DraggableComponentEvent(this);
      Object[] l = listeners.toArray();
      for (int i = 0; i < l.length; i++)
        ((DraggableComponentListener) l[i]).selected(event);
    }
  }

  private void fireDraggedEvent(MouseEvent mouseEvent) {
    dragEventFired = true;
    if (listeners != null) {
      DraggableComponentEvent event = new DraggableComponentEvent(this, mouseEvent);
      Object[] l = listeners.toArray();
      for (int i = 0; i < l.length; i++)
        ((DraggableComponentListener) l[i]).dragged(event);
    }
  }

  private void fireDroppedEvent(MouseEvent mouseEvent) {
    updateParent();

    if (dragEventFired) {
      dragEventFired = false;
      if (listeners != null) {
        DraggableComponentEvent event = new DraggableComponentEvent(this, mouseEvent);
        Object[] l = listeners.toArray();
        for (int i = 0; i < l.length; i++)
          ((DraggableComponentListener) l[i]).dropped(event);
      }
    }
  }

  private void fireNotDroppedEvent() {
    updateParent();

    if (dragEventFired) {
      dragEventFired = false;
      if (listeners != null) {
        DraggableComponentEvent event = new DraggableComponentEvent(this);
        Object[] l = listeners.toArray();
        for (int i = 0; i < l.length; i++)
          ((DraggableComponentListener) l[i]).dragAborted(event);
      }
    }
  }
}