removeLayoutComponent()
This method is called when a component is removed from the container. Your custom layout manager
should remove any references to the component, as well as any data it maintains that's related to the
component, such as constraint information. The implementation of this method in DividerLayout is
shown below:
public void removeLayoutComponent(Component comp) {
if (comp == westComponent) {
westComponent = null;
}
else if (comp == centerComponent) {
centerComponent = null;
}
else if (comp == eastComponent) {
centerComponent = null;
}
}
preferredLayoutSize() and minimumLayoutSize()
preferredLayoutSize() is similar to the maximumLayoutSize() method described earlier, and in
fact its implementation will often differ only in that it calls the getPreferredSize() method for each
component instead of getMaximumSize(). The purpose of this method is to calculate the preferred size of
the Container instance associated with this layout manager. The implementation of this method in
DividerLayout is shown below:
public Dimension preferredLayoutSize(Container parent) {
Dimension size;
int width = 0;
int height = 0;
if ((westComponent != null) && (westComponent.isVisible())) {
size = westComponent.getPreferredSize();
width = Math.max(width, size.width);
height = Math.max(height, size.height);
}
if ((eastComponent != null) && (eastComponent.isVisible())) {
size = eastComponent.getPreferredSize();
width = Math.max(width, size.width);
height = Math.max(height, size.height);
}
width *= 2;
if ((centerComponent != null) && (centerComponent.isVisible())) {
size = centerComponent.getPreferredSize();
width += size.width;
height = Math.max(height, size.height);
}
return new Dimension(width, height);
}
Similarly, minimumLayoutSize() differs only in that it calls the getMinimumSize() method instead of
getPreferredSize() or getMaximumSize(); the purpose of this method is to calculate the minimum
size of the Container instance associated with this layout manager:
public Dimension minimumLayoutSize(Container parent) {
Dimension size;
int width = 0;
int height = 0;
if ((westComponent != null) && (westComponent.isVisible())) {
size = westComponent.getMinimumSize();
width = Math.max(width, size.width);
height = Math.max(height, size.height);
}
if ((eastComponent != null) && (eastComponent.isVisible())) {
size = eastComponent.getMinimumSize();
width = Math.max(width, size.width);
height = Math.max(height, size.height);
}
width *= 2;
if ((centerComponent != null) && (centerComponent.isVisible())) {
size = centerComponent.getPreferredSize();
width += size.width;
height += Math.max(height, size.height);
}
return new Dimension(width, height);
}
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