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import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.lang.ref.WeakReference;
import javax.swing.JComponent;
/**
* Special simple layout used in TabbedContainer. Shows component in the
* "stack", it means that only one component is visible at any time, others are
* always hidden "below" the visible one. Use method showComponent to select
* visible component.
*
* @author Dafe Simonek
*/
class StackLayout implements LayoutManager {
// #100486 - hold visibleComp weakly, because removeLayoutComponent may not
// be called and then visibleComp is not freed. See StackLayoutTest for details.
/**
* Holds currently visible component or null if no comp is visible
*/
private WeakReference<Component> visibleComp = null;
/**
* Set the currently displayed component. If passed null for the component,
* all contained components will be made invisible (sliding windows do this)
* @param c Component to show
* @param parent Parent container
*/
public void showComponent(Component c, Container parent) {
Component comp = getVisibleComponent();
if (comp != c) {
if (!parent.isAncestorOf(c) && c != null) {
parent.add(c);
}
synchronized (parent.getTreeLock()) {
if (comp != null) {
comp.setVisible(false);
}
visibleComp = new WeakReference<Component>(c);
if (c != null) {
c.setVisible(true);
}
// trigger re-layout
if (c instanceof JComponent) {
((JComponent)c).revalidate();
}
else {
parent.validate(); //XXX revalidate should work!
}
}
}
}
/** Allows support for content policies
* @return Currently visible component or null
*/
public Component getVisibleComponent() {
return visibleComp == null ? null : visibleComp.get();
}
/**
* ********** Implementation of LayoutManager interface *********
*/
public void addLayoutComponent(String name, Component comp) {
synchronized (comp.getTreeLock()) {
comp.setVisible(false);
// keep consistency if showComponent was already called on this
// component before
if (comp == getVisibleComponent()) {
visibleComp = null;
}
/*System.out.println("Border dump for " + comp.getName());
borderDump((javax.swing.JComponent)comp, "");*/
}
}
/*private void borderDump (javax.swing.JComponent comp, String space) {
javax.swing.border.Border compBorder = comp.getBorder();
if (compBorder == null) {
System.out.println(space + comp.getClass().getName() + " has no border.");
} else {
System.out.println(space + comp.getClass().getName() + ": " + compBorder.getClass().getName());
}
Component curComp;
for (int i = 0; i < comp.getComponentCount(); i++) {
curComp = comp.getComponent(i);
if (curComp instanceof javax.swing.JComponent) {
borderDump((javax.swing.JComponent)curComp, space + " ");
}
}
}*/
public void removeLayoutComponent(Component comp) {
synchronized (comp.getTreeLock()) {
if (comp == getVisibleComponent()) {
visibleComp = null;
}
// kick out removed component as visible, so that others
// don't have problems with hidden components
comp.setVisible(true);
}
}
public void layoutContainer(Container parent) {
Component visibleComp = getVisibleComponent();
if (visibleComp != null) {
synchronized (parent.getTreeLock()) {
Insets insets = parent.getInsets();
visibleComp.setBounds(insets.left, insets.top, parent.getWidth()
- (insets.left + insets.right), parent.getHeight()
- (insets.top + insets.bottom));
}
}
}
public Dimension minimumLayoutSize(Container parent) {
return getEmptySize();
}
public Dimension preferredLayoutSize(Container parent) {
return getEmptySize();
}
/**
* Specifies default size of empty container
*/
private static Dimension getEmptySize() {
return new Dimension(50, 50);
}
}
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