/**
* Updates the layout in response to receiving notification of change from the model. This is
* implemented to call <code>preferenceChanged</code> to reschedule a new layout if the <code>
* ElementChange</code> record is not <code>null</code>.
*
* @param ec changes to the element this view is responsible for (may be <code>null</code> if
* there were no changes)
* @param e the change information from the associated document
* @param a the current allocation of the view
* @see #insertUpdate
* @see #removeUpdate
* @see #changedUpdate
* @since 1.3
*/
protected void updateLayout(DocumentEvent.ElementChange ec, DocumentEvent e, Shape a) {
if ((ec != null) && (a != null)) {
// should damage more intelligently
preferenceChanged(null, true, true);
Container host = getContainer();
if (host != null) {
host.repaint();
}
}
}
/**
* Lays out the children. If the span along the flow axis has changed, layout is marked as invalid
* which which will cause the superclass behavior to recalculate the layout along the box axis.
* The FlowStrategy.layout method will be called to rebuild the flow rows as appropriate. If the
* height of this view changes (determined by the perferred size along the box axis), a
* preferenceChanged is called. Following all of that, the normal box layout of the superclass is
* performed.
*
* @param width the width to lay out against >= 0. This is the width inside of the inset area.
* @param height the height to lay out against >= 0 This is the height inside of the inset area.
*/
protected void layout(int width, int height) {
final int faxis = getFlowAxis();
int newSpan;
if (faxis == X_AXIS) {
newSpan = (int) width;
} else {
newSpan = (int) height;
}
if (layoutSpan != newSpan) {
layoutChanged(faxis);
layoutChanged(getAxis());
layoutSpan = newSpan;
}
// repair the flow if necessary
if (!isLayoutValid(faxis)) {
final int heightAxis = getAxis();
int oldFlowHeight = (int) ((heightAxis == X_AXIS) ? getWidth() : getHeight());
strategy.layout(this);
int newFlowHeight = (int) getPreferredSpan(heightAxis);
if (oldFlowHeight != newFlowHeight) {
View p = getParent();
if (p != null) {
p.preferenceChanged(this, (heightAxis == X_AXIS), (heightAxis == Y_AXIS));
}
// PENDING(shannonh)
// Temporary fix for 4250847
// Can be removed when TraversalContext is added
Component host = getContainer();
if (host != null) {
// nb idk 12/12/2001 host should not be equal to null. We need to add assertion here
host.repaint();
}
}
}
super.layout(width, height);
}
/**
* Child views can call this on the parent to indicate that the preference has changed and should
* be reconsidered for layout. By default this just propagates upward to the next parent. The root
* view will call <code>revalidate</code> on the associated text component.
*
* @param child the child view
* @param width true if the width preference has changed
* @param height true if the height preference has changed
* @see javax.swing.JComponent#revalidate
*/
public void preferenceChanged(View child, boolean width, boolean height) {
View parent = getParent();
if (parent != null) {
parent.preferenceChanged(this, width, height);
}
}