BasicHeaderUI.java 文件源码

protected void installListeners(final JXHeader header) {
    propListener = new PropertyChangeListener() {
        @Override
        public void propertyChange(PropertyChangeEvent evt) {
            onPropertyChange(header, evt.getPropertyName(), evt.getOldValue(), evt.getNewValue());
        }
    };
    boundsListener = new HierarchyBoundsAdapter() {
        @Override
        public void ancestorResized(HierarchyEvent e) {
            if (header == e.getComponent()) {
                View v = (View) descriptionPane.getClientProperty(BasicHTML.propertyKey);
                // view might get lost on LAF change ...
                if (v == null) {
                    descriptionPane.putClientProperty(BasicHTML.propertyKey, 
                            MultiLineSupport.createView(descriptionPane));
                    v = (View) descriptionPane.getClientProperty(BasicHTML.propertyKey);
                }
                if (v != null) {
                    Container tla = header.getTopLevelAncestor();
                    if (tla == null) {
                        tla = header.getParent();
                        while (tla.getParent() != null) {
                            tla = tla.getParent();
                        }
                    }
                    int h = Math.max(descriptionPane.getHeight(), tla.getHeight());
                    int w = Math.min(tla.getWidth(), header.getParent().getWidth());
                    // 35 = description pane insets, TODO: obtain dynamically
                    w -= 35 + header.getInsets().left + header.getInsets().right + descriptionPane.getInsets().left + descriptionPane.getInsets().right + imagePanel.getInsets().left + imagePanel.getInsets().right + imagePanel.getWidth() + descriptionPane.getBounds().x;
                    v.setSize(w, h);
                    descriptionPane.setSize(w, (int) Math.ceil(v.getPreferredSpan(View.Y_AXIS)));
                }
            }
        }};
    header.addPropertyChangeListener(propListener);
    header.addHierarchyBoundsListener(boundsListener);
}