/*
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* Copyright 2012 gitblit.com.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.gitblit.authority;
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import javax.swing.JComponent;
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import javax.swing.event.AncestorEvent;
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import javax.swing.event.AncestorListener;
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/**
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* Convenience class to request focus on a component.
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*
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* When the component is added to a realized Window then component will
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* request focus immediately, since the ancestorAdded event is fired
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* immediately.
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*
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* When the component is added to a non realized Window, then the focus
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* request will be made once the window is realized, since the
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* ancestorAdded event will not be fired until then.
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*
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* Using the default constructor will cause the listener to be removed
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* from the component once the AncestorEvent is generated. A second constructor
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* allows you to specify a boolean value of false to prevent the
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* AncestorListener from being removed when the event is generated. This will
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* allow you to reuse the listener each time the event is generated.
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*
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* @author Rob Camick
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*/
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public class RequestFocusListener implements AncestorListener
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{
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private boolean removeListener;
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/*
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* Convenience constructor. The listener is only used once and then it is
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* removed from the component.
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*/
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public RequestFocusListener()
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{
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this(true);
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}
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/*
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* Constructor that controls whether this listen can be used once or
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* multiple times.
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*
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* @param removeListener when true this listener is only invoked once
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* otherwise it can be invoked multiple times.
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*/
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public RequestFocusListener(boolean removeListener)
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{
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this.removeListener = removeListener;
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}
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@Override
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public void ancestorAdded(AncestorEvent e)
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{
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JComponent component = e.getComponent();
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component.requestFocusInWindow();
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if (removeListener)
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component.removeAncestorListener( this );
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}
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@Override
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public void ancestorMoved(AncestorEvent e) {}
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@Override
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public void ancestorRemoved(AncestorEvent e) {}
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}
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