Java Container.isFocusCycleRoot方法代码示例

import java.awt.Container; //导入方法依赖的package包/类
/**
 * Requests focus on a child of the spinner if the spinner doesn't have
 * focus.
 */
private void focusSpinnerIfNecessary()
{
	Component fo = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
	if( spinner.isRequestFocusEnabled() && (fo == null || !SwingUtilities.isDescendingFrom(fo, spinner)) )
	{
		Container root = spinner;

		if( !root.isFocusCycleRoot() )
		{
			root = root.getFocusCycleRootAncestor();
		}
		if( root != null )
		{
			FocusTraversalPolicy ftp = root.getFocusTraversalPolicy();
			Component child = ftp.getComponentAfter(root, spinner);

			if( child != null && SwingUtilities.isDescendingFrom(child, spinner) )
			{
				child.requestFocus();
			}
		}
	}
}
 

import java.awt.Container; //导入方法依赖的package包/类
public Component getComponentAfter(Container aContainer,
                                   Component aComponent)
{
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getComponentAfter(root, aComponent);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getComponentAfter(root, aComponent);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
public Component getComponentBefore(Container aContainer,
                                    Component aComponent)
{
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getComponentBefore(root, aComponent);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getComponentBefore(root, aComponent);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
public Component getFirstComponent(Container aContainer) {
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getFirstComponent(root);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getFirstComponent(root);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
public Component getLastComponent(Container aContainer) {
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getLastComponent(root);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getLastComponent(root);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
private void enumerateCycle(Container container, List<Component> cycle) {
    if (!(container.isVisible() && container.isDisplayable())) {
        return;
    }

    cycle.add(container);

    Component[] components = container.getComponents();
    for (Component comp : components) {
        if (comp instanceof Container) {
            Container cont = (Container)comp;

            if (!cont.isFocusCycleRoot() &&
                !cont.isFocusTraversalPolicyProvider() &&
                !((cont instanceof JComponent) && ((JComponent)cont).isManagingFocus()))
            {
                enumerateCycle(cont, cycle);
                continue;
            }
        }
        cycle.add(comp);
    }
}
 

import java.awt.Container; //导入方法依赖的package包/类
/**
 * Returns the component after.
 * @return the component after
 * @param aContainer a container
 * @param aComponent a component
 */
public Component getComponentAfter(Container aContainer,
                                   Component aComponent)
{
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getComponentAfter(root, aComponent);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getComponentAfter(root, aComponent);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
/**
 * Returns the component before.
 * @return the component before
 * @param aContainer a container
 * @param aComponent a component
 */
public Component getComponentBefore(Container aContainer,
                                    Component aComponent)
{
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getComponentBefore(root, aComponent);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getComponentBefore(root, aComponent);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
/**
 * Returns the first component.
 * @return the first component
 * @param aContainer a container
 */
public Component getFirstComponent(Container aContainer) {
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getFirstComponent(root);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getFirstComponent(root);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
/**
 * Returns the last component.
 * @return the last component
 * @param aContainer a container
 */
public Component getLastComponent(Container aContainer) {
    Container root = (aContainer.isFocusCycleRoot())
        ? aContainer
        : aContainer.getFocusCycleRootAncestor();

    // Support for mixed 1.4/pre-1.4 focus APIs. If a particular root's
    // traversal policy is non-legacy, then honor it.
    if (root != null) {
        FocusTraversalPolicy policy = root.getFocusTraversalPolicy();
        if (policy != gluePolicy) {
            return policy.getLastComponent(root);
        }

        comparator.setComponentOrientation(root.getComponentOrientation());
        return layoutPolicy.getLastComponent(root);
    }

    return null;
}
 

import java.awt.Container; //导入方法依赖的package包/类
@SuppressWarnings("deprecation")
private void enumerateCycle(Container container, List<Component> cycle) {
    if (!(container.isVisible() && container.isDisplayable())) {
        return;
    }

    cycle.add(container);

    Component[] components = container.getComponents();
    for (Component comp : components) {
        if (comp instanceof Container) {
            Container cont = (Container)comp;

            if (!cont.isFocusCycleRoot() &&
                !cont.isFocusTraversalPolicyProvider() &&
                !((cont instanceof JComponent) && ((JComponent)cont).isManagingFocus()))
            {
                enumerateCycle(cont, cycle);
                continue;
            }
        }
        cycle.add(comp);
    }
}
 

import java.awt.Container; //导入方法依赖的package包/类
private Component getComponentDownCycle(Component comp, int traversalDirection) {
    Component retComp = null;

    if (comp instanceof Container) {
        Container cont = (Container)comp;

        if (cont.isFocusCycleRoot()) {
            if (getImplicitDownCycleTraversal()) {
                retComp = cont.getFocusTraversalPolicy().getDefaultComponent(cont);

                if (retComp != null && log.isLoggable(PlatformLogger.Level.FINE)) {
                    log.fine("### Transfered focus down-cycle to " + retComp +
                             " in the focus cycle root " + cont);
                }
            } else {
                return null;
            }
        } else if (cont.isFocusTraversalPolicyProvider()) {
            retComp = (traversalDirection == FORWARD_TRAVERSAL ?
                       cont.getFocusTraversalPolicy().getDefaultComponent(cont) :
                       cont.getFocusTraversalPolicy().getLastComponent(cont));

            if (retComp != null && log.isLoggable(PlatformLogger.Level.FINE)) {
                log.fine("### Transfered focus to " + retComp + " in the FTP provider " + cont);
            }
        }
    }
    return retComp;
}