public void endInteraction() {
assert scalingGroup.getParent().isManaged() == false;
// Reverts the top stack pane : it now adjusts to the size of its children
final StackPane contentPane = (StackPane) scrollPane.getContent();
assert contentPane.getMinWidth() == Region.USE_PREF_SIZE;
assert contentPane.getMinHeight() == Region.USE_PREF_SIZE;
assert contentPane.getPrefWidth() != Region.USE_COMPUTED_SIZE;
assert contentPane.getPrefHeight() != Region.USE_COMPUTED_SIZE;
assert contentPane.getMaxWidth() == Region.USE_PREF_SIZE;
assert contentPane.getMaxHeight() == Region.USE_PREF_SIZE;
contentPane.setPrefWidth(Region.USE_COMPUTED_SIZE);
contentPane.setPrefHeight(Region.USE_COMPUTED_SIZE);
contentPane.setMaxWidth(Double.MAX_VALUE);
contentPane.setMaxHeight(Double.MAX_VALUE);
// Reverts scalingGroup setup
scalingGroup.getParent().setManaged(true);
}
public void beginInteraction() {
assert scalingGroup.getParent().isManaged();
assert scrollPane.getContent() instanceof StackPane;
// Makes the user design and enclosing group unmanaged so
// that they no longer influence the scroll pane viewport.
scalingGroup.getParent().setManaged(false);
// Renders the top stack pane fully rigid
final StackPane contentPane = (StackPane) scrollPane.getContent();
assert contentPane.getMinWidth() == Region.USE_PREF_SIZE;
assert contentPane.getMinHeight() == Region.USE_PREF_SIZE;
assert contentPane.getPrefWidth() == Region.USE_COMPUTED_SIZE;
assert contentPane.getPrefHeight() == Region.USE_COMPUTED_SIZE;
assert contentPane.getMaxWidth() == Double.MAX_VALUE;
assert contentPane.getMaxHeight() == Double.MAX_VALUE;
contentPane.setPrefWidth(contentPane.getWidth());
contentPane.setPrefHeight(contentPane.getHeight());
contentPane.setMaxWidth(Region.USE_PREF_SIZE);
contentPane.setMaxHeight(Region.USE_PREF_SIZE);
}