javax.swing.JViewport#getParent ( )源码实例Demo

public void stateChanged(ChangeEvent e)
{
	//  Keep the scrolling of the row table in sync with main table

	JViewport viewport = (JViewport) e.getSource();
	JScrollPane scrollPane = (JScrollPane)viewport.getParent();
	scrollPane.setBorder(new MarsPanelBorder());
	scrollPane.getVerticalScrollBar().setValue(viewport.getViewPosition().y);
}
 

public void stateChanged(ChangeEvent e) {
	// Keep the scrolling of the row table in sync with main table

	JViewport viewport = (JViewport) e.getSource();
	JScrollPane scrollPane = (JScrollPane) viewport.getParent();
	scrollPane.getVerticalScrollBar()
			.setValue(viewport.getViewPosition().y);
}
 

public @Override void propertyChange(PropertyChangeEvent evt) {
            String propName = evt.getPropertyName();
            JTextComponent c = component;
            if ("document".equals(propName)) { // NOI18N
                if (c != null) {
                    modelChanged(activeDoc, c.getDocument());
                }

            } else if (EditorUtilities.CARET_OVERWRITE_MODE_PROPERTY.equals(propName)) {
                Boolean b = (Boolean) evt.getNewValue();
                overwriteMode = (b != null) ? b : false;
                updateOverwriteModeLayer(true);
                updateType();

            } else if ("ancestor".equals(propName) && evt.getSource() == component) { // NOI18N
                // The following code ensures that when the width of the line views
                // gets computed on background after the file gets opened
                // (so the horizontal scrollbar gets added after several seconds
                // for larger files) that the suddenly added horizontal scrollbar
                // will not hide the caret laying on the last line of the viewport.
                // A component listener gets installed into horizontal scrollbar
                // and if it's fired the caret's bounds will be checked whether
                // they intersect with the horizontal scrollbar
                // and if so the view will be scrolled.
                final JViewport viewport = getViewport();
                if (viewport != null) {
                    Component parent = viewport.getParent();
                    if (parent instanceof JScrollPane) {
                        JScrollPane scrollPane = (JScrollPane) parent;
                        JScrollBar hScrollBar = scrollPane.getHorizontalScrollBar();
                        if (hScrollBar != null) {
                            // Add weak listener so that editor pane could be removed
                            // from scrollpane without being held by scrollbar
                            hScrollBar.addComponentListener(
                                    (ComponentListener) WeakListeners.create(
                                            ComponentListener.class, listenerImpl, hScrollBar));
                        }
                    }
                }
            } else if ("enabled".equals(propName)) {
                Boolean enabled = (Boolean) evt.getNewValue();
                if (component.isFocusOwner()) {
                    if (enabled == Boolean.TRUE) {
                        if (component.isEditable()) {
                            setVisible(true);
                        }
                        setSelectionVisible(true);
                    } else {
                        setVisible(false);
                        setSelectionVisible(false);
                    }
                }
            } else if (RECTANGULAR_SELECTION_PROPERTY.equals(propName)) {
                boolean origRectangularSelection = rectangularSelection;
                rectangularSelection = Boolean.TRUE.equals(component.getClientProperty(RECTANGULAR_SELECTION_PROPERTY));
                if (rectangularSelection != origRectangularSelection) {
                    if (rectangularSelection) {
                        setRectangularSelectionToDotAndMark();
//                        RectangularSelectionTransferHandler.install(component);

                    } else { // No rectangular selection
//                        RectangularSelectionTransferHandler.uninstall(component);
                    }
                    fireStateChanged(null);
                }
            }
        }