JDK8/Java8源码在线阅读
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package javax.swing.plaf;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
/**
* The base class for all {@link javax.swing.JLayer}'s UI delegates.
* <p>
* {@link #paint(java.awt.Graphics, javax.swing.JComponent)} method performs the
* painting of the {@code JLayer}
* and {@link #eventDispatched(AWTEvent, JLayer)} method is notified
* about any {@code AWTEvent}s which have been generated by a {@code JLayer}
* or any of its subcomponents.
* <p>
* The {@code LayerUI} differs from the UI delegates of the other components,
* because it is LookAndFeel independent and is not updated by default when
* the system LookAndFeel is changed.
* <p>
* The subclasses of {@code LayerUI} can either be stateless and shareable
* by multiple {@code JLayer}s or not shareable.
*
* @param <V> one of the super types of {@code JLayer}'s view component
*
* @see JLayer#setUI(LayerUI)
* @see JLayer#setView(Component)
* @see JLayer#getView()
* @since 1.7
*
* @author Alexander Potochkin
*/
public class LayerUI<V extends Component>
extends ComponentUI implements Serializable {
private final PropertyChangeSupport propertyChangeSupport =
new PropertyChangeSupport(this);
/**
* Paints the specified component.
* Subclasses should override this method and use
* the specified {@code Graphics} object to
* render the content of the component.
* <p>
* The default implementation paints the passed component as is.
*
* @param g the {@code Graphics} context in which to paint
* @param c the component being painted
*/
public void paint(Graphics g, JComponent c) {
c.paint(g);
}
/**
* Processes {@code AWTEvent}s for {@code JLayer}
* and <b>all its descendants</b> to this {@code LayerUI} instance.
* <p>
* To enable the {@code AWTEvent}s of a particular type,
* you call {@link JLayer#setLayerEventMask}
* in {@link #installUI(javax.swing.JComponent)}
* and set the layer event mask to {@code 0}
* in {@link #uninstallUI(javax.swing.JComponent)} after that.
* By default this method calls the appropriate
* {@code process<event type>Event}
* method for the given class of event.
* <p>
* <b>Note:</b> Events are processed only for displayable {@code JLayer}s.
*
* @param e the event to be dispatched
* @param l the layer this LayerUI is set to
*
* @see JLayer#setLayerEventMask(long)
* @see Component#isDisplayable()
* @see #processComponentEvent
* @see #processFocusEvent
* @see #processKeyEvent
* @see #processMouseEvent
* @see #processMouseMotionEvent
* @see #processInputMethodEvent
* @see #processHierarchyEvent
* @see #processMouseWheelEvent
*/
public void eventDispatched(AWTEvent e, JLayer<? extends V> l){
if (e instanceof FocusEvent) {
processFocusEvent((FocusEvent)e, l);
} else if (e instanceof MouseEvent) {
switch(e.getID()) {
case MouseEvent.MOUSE_PRESSED:
case MouseEvent.MOUSE_RELEASED:
case MouseEvent.MOUSE_CLICKED:
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
processMouseEvent((MouseEvent)e, l);
break;
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
processMouseMotionEvent((MouseEvent)e, l);
break;
case MouseEvent.MOUSE_WHEEL:
processMouseWheelEvent((MouseWheelEvent)e, l);
break;
}
} else if (e instanceof KeyEvent) {
processKeyEvent((KeyEvent)e, l);
} else if (e instanceof ComponentEvent) {
processComponentEvent((ComponentEvent)e, l);
} else if (e instanceof InputMethodEvent) {
processInputMethodEvent((InputMethodEvent)e, l);
} else if (e instanceof HierarchyEvent) {
switch (e.getID()) {
case HierarchyEvent.HIERARCHY_CHANGED:
processHierarchyEvent((HierarchyEvent)e, l);
break;
case HierarchyEvent.ANCESTOR_MOVED:
case HierarchyEvent.ANCESTOR_RESIZED:
processHierarchyBoundsEvent((HierarchyEvent)e, l);
break;
}
}
}
/**
* Processes component events occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless component events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Component events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.COMPONENT_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code ComponentEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processComponentEvent(ComponentEvent e, JLayer<? extends V> l) {
}
/**
* Processes focus events occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless focus events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Focus events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.FOCUS_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code FocusEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processFocusEvent(FocusEvent e, JLayer<? extends V> l) {
}
/**
* Processes key events occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless key events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Key events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.KEY_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code KeyEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processKeyEvent(KeyEvent e, JLayer<? extends V> l) {
}
/**
* Processes mouse events occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless mouse events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Mouse events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code MouseEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processMouseEvent(MouseEvent e, JLayer<? extends V> l) {
}
/**
* Processes mouse motion event occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless mouse motion events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Mouse motion events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.MOUSE_MOTION_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code MouseEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processMouseMotionEvent(MouseEvent e, JLayer<? extends V> l) {
}
/**
* Processes mouse wheel event occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless mouse wheel events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Mouse wheel events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.MOUSE_WHEEL_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code MouseEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processMouseWheelEvent(MouseWheelEvent e, JLayer<? extends V> l) {
}
/**
* Processes input event occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless input events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Input events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.INPUT_METHOD_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code InputMethodEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processInputMethodEvent(InputMethodEvent e, JLayer<? extends V> l) {
}
/**
* Processes hierarchy event occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless hierarchy events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Hierarchy events are enabled in the overridden {@link #installUI} method
* and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.HIERARCHY_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code HierarchyEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processHierarchyEvent(HierarchyEvent e, JLayer<? extends V> l) {
}
/**
* Processes hierarchy bounds event occurring on the {@link JLayer}
* or any of its subcomponents.
* <p>
* This method is not called unless hierarchy bounds events are
* enabled for the {@code JLayer} objects, this {@code LayerUI} is set to.
* Hierarchy bounds events are enabled in the overridden {@link #installUI}
* method and should be disabled in the {@link #uninstallUI} method after that.
* <pre>
* public void installUI(JComponent c) {
* super.installUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK);
* }
*
* public void uninstallUI(JComponent c) {
* super.uninstallUI(c);
* JLayer l = (JLayer) c;
* l.setLayerEventMask(0);
* }
* </pre>
*
* @param e the {@code HierarchyEvent} to be processed
* @param l the layer this {@code LayerUI} instance is set to
*
* @see JLayer#setLayerEventMask(long)
* @see #installUI(javax.swing.JComponent)
* @see #uninstallUI(javax.swing.JComponent)
*/
protected void processHierarchyBoundsEvent(HierarchyEvent e, JLayer<? extends V> l) {
}
/**
* Invoked when {@link javax.swing.JLayer#updateUI()} is called
* by the {@code JLayer} this {@code LayerUI} is set to.
*
* @param l the {@code JLayer} which UI is updated
*/
public void updateUI(JLayer<? extends V> l){
}
/**
* Configures the {@code JLayer} this {@code LayerUI} is set to.
* The default implementation registers the passed {@code JLayer} component
* as a {@code PropertyChangeListener} for the property changes of this {@code LayerUI}.
*
* @param c the {@code JLayer} component where this UI delegate is being installed
*/
public void installUI(JComponent c) {
addPropertyChangeListener((JLayer) c);
}
/**
* Reverses the configuration which was previously set
* in the {@link #installUI(JComponent)} method.
* The default implementation unregisters the passed {@code JLayer} component
* as a {@code PropertyChangeListener} for the property changes of this {@code LayerUI}.
*
* @param c the component from which this UI delegate is being removed.
*/
public void uninstallUI(JComponent c) {
removePropertyChangeListener((JLayer) c);
}
/**
* Adds a PropertyChangeListener to the listener list. The listener is
* registered for all bound properties of this class.
* <p>
* If {@code listener} is {@code null},
* no exception is thrown and no action is performed.
*
* @param listener the property change listener to be added
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners
* @see #addPropertyChangeListener(String, java.beans.PropertyChangeListener)
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(listener);
}
/**
* Removes a PropertyChangeListener from the listener list. This method
* should be used to remove PropertyChangeListeners that were registered
* for all bound properties of this class.
* <p>
* If {@code listener} is {@code null},
* no exception is thrown and no action is performed.
*
* @param listener the PropertyChangeListener to be removed
* @see #addPropertyChangeListener
* @see #getPropertyChangeListeners
* @see #removePropertyChangeListener(String, PropertyChangeListener)
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
propertyChangeSupport.removePropertyChangeListener(listener);
}
/**
* Returns an array of all the property change listeners
* registered on this component.
*
* @return all of this ui's {@code PropertyChangeListener}s
* or an empty array if no property change
* listeners are currently registered
* @see #addPropertyChangeListener
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners(String)
*/
public PropertyChangeListener[] getPropertyChangeListeners() {
return propertyChangeSupport.getPropertyChangeListeners();
}
/**
* Adds a PropertyChangeListener to the listener list for a specific
* property.
* <p>
* If {@code propertyName} or {@code listener} is {@code null},
* no exception is thrown and no action is taken.
*
* @param propertyName one of the property names listed above
* @param listener the property change listener to be added
* @see #removePropertyChangeListener(String, PropertyChangeListener)
* @see #getPropertyChangeListeners(String)
* @see #addPropertyChangeListener(String, PropertyChangeListener)
*/
public void addPropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
}
/**
* Removes a {@code PropertyChangeListener} from the listener
* list for a specific property. This method should be used to remove
* {@code PropertyChangeListener}s
* that were registered for a specific bound property.
* <p>
* If {@code propertyName} or {@code listener} is {@code null},
* no exception is thrown and no action is taken.
*
* @param propertyName a valid property name
* @param listener the PropertyChangeListener to be removed
* @see #addPropertyChangeListener(String, PropertyChangeListener)
* @see #getPropertyChangeListeners(String)
* @see #removePropertyChangeListener(PropertyChangeListener)
*/
public void removePropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
propertyChangeSupport.removePropertyChangeListener(propertyName, listener);
}
/**
* Returns an array of all the listeners which have been associated
* with the named property.
*
* @param propertyName The name of the property being listened to
* @return all of the {@code PropertyChangeListener}s associated with
* the named property; if no such listeners have been added or
* if {@code propertyName} is {@code null}, an empty
* array is returned
* @see #addPropertyChangeListener(String, PropertyChangeListener)
* @see #removePropertyChangeListener(String, PropertyChangeListener)
* @see #getPropertyChangeListeners
*/
public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
return propertyChangeSupport.getPropertyChangeListeners(propertyName);
}
/**
* Support for reporting bound property changes for Object properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
*/
protected void firePropertyChange(String propertyName,
Object oldValue, Object newValue) {
propertyChangeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Notifies the {@code LayerUI} when any of its property are changed
* and enables updating every {@code JLayer}
* this {@code LayerUI} instance is set to.
*
* @param evt the PropertyChangeEvent generated by this {@code LayerUI}
* @param l the {@code JLayer} this LayerUI is set to
*/
public void applyPropertyChange(PropertyChangeEvent evt, JLayer<? extends V> l) {
}
/**
* If the {@code JLayer}'s view component is not {@code null},
* this calls the view's {@code getBaseline()} method.
* Otherwise, the default implementation is called.
*
* @param c {@code JLayer} to return baseline resize behavior for
* @param width the width to get the baseline for
* @param height the height to get the baseline for
* @return baseline or a value < 0 indicating there is no reasonable
* baseline
*/
public int getBaseline(JComponent c, int width, int height) {
JLayer l = (JLayer) c;
if (l.getView() != null) {
return l.getView().getBaseline(width, height);
}
return super.getBaseline(c, width, height);
}
/**
* If the {@code JLayer}'s view component is not {@code null},
* this returns the result of the view's {@code getBaselineResizeBehavior()} method.
* Otherwise, the default implementation is called.
*
* @param c {@code JLayer} to return baseline resize behavior for
* @return an enum indicating how the baseline changes as the component
* size changes
*/
public Component.BaselineResizeBehavior getBaselineResizeBehavior(JComponent c) {
JLayer l = (JLayer) c;
if (l.getView() != null) {
return l.getView().getBaselineResizeBehavior();
}
return super.getBaselineResizeBehavior(c);
}
/**
* Causes the passed instance of {@code JLayer} to lay out its components.
*
* @param l the {@code JLayer} component where this UI delegate is being installed
*/
public void doLayout(JLayer<? extends V> l) {
Component view = l.getView();
if (view != null) {
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