/**
* Shows the preference page corresponding to the given preference node. Does nothing if that page
* is already current.
*
* @param node the preference node, or <code>null</code> if none
* @return <code>true</code> if the page flip was successful, and <code>false</code> is
* unsuccessful
*/
protected boolean showPage(IPreferenceNode node) {
if (node == null) {
return false;
}
// Create the page if nessessary
if (node.getPage() == null) {
createPage(node);
}
if (node.getPage() == null) {
return false;
}
IPreferencePage newPage = getPage(node);
if (newPage == currentPage) {
return true;
}
if (currentPage != null) {
if (!currentPage.okToLeave()) {
return false;
}
}
IPreferencePage oldPage = currentPage;
currentPage = newPage;
// Set the new page's container
currentPage.setContainer(this);
// Ensure that the page control has been created
// (this allows lazy page control creation)
if (currentPage.getControl() == null) {
final boolean[] failed = {false};
SafeRunnable.run(
new ISafeRunnable() {
@Override
public void handleException(Throwable e) {
failed[0] = true;
}
@Override
public void run() {
createPageControl(currentPage, pageContainer);
}
});
if (failed[0]) {
return false;
}
// the page is responsible for ensuring the created control is
// accessable
// via getControl.
Assert.isNotNull(currentPage.getControl());
}
// Force calculation of the page's description label because
// label can be wrapped.
final Point[] size = new Point[1];
final Point failed = new Point(-1, -1);
SafeRunnable.run(
new ISafeRunnable() {
@Override
public void handleException(Throwable e) {
size[0] = failed;
}
@Override
public void run() {
size[0] = currentPage.computeSize();
}
});
if (size[0].equals(failed)) {
return false;
}
Point contentSize = size[0];
// Do we need resizing. Computation not needed if the
// first page is inserted since computing the dialog's
// size is done by calling dialog.open().
// Also prevent auto resize if the user has manually resized
Shell shell = getShell();
Point shellSize = shell.getSize();
if (oldPage != null) {
Rectangle rect = pageContainer.getClientArea();
Point containerSize = new Point(rect.width, rect.height);
int hdiff = contentSize.x - containerSize.x;
int vdiff = contentSize.y - containerSize.y;
if ((hdiff > 0 || vdiff > 0) && shellSize.equals(lastShellSize)) {
hdiff = Math.max(0, hdiff);
vdiff = Math.max(0, vdiff);
setShellSize(shellSize.x + hdiff, shellSize.y + vdiff);
lastShellSize = shell.getSize();
if (currentPage.getControl().getSize().x == 0) {
currentPage.getControl().setSize(containerSize);
}
} else {
currentPage.getControl().setSize(containerSize);
}
}
scrolled.setMinSize(contentSize);
// Ensure that all other pages are invisible
// (including ones that triggered an exception during
// their creation).
Control[] children = pageContainer.getChildren();
Control currentControl = currentPage.getControl();
for (int i = 0; i < children.length; i++) {
if (children[i] != currentControl) {
children[i].setVisible(false);
}
}
// Make the new page visible
currentPage.setVisible(true);
if (oldPage != null) {
oldPage.setVisible(false);
}
// update the dialog controls
update();
return true;
}
