/**
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.waveprotocol.wave.client.scroll;
import org.waveprotocol.wave.client.common.util.KeyCombo;
import org.waveprotocol.wave.client.wavepanel.WavePanel;
import org.waveprotocol.wave.client.wavepanel.event.KeySignalHandler;
import java.util.EnumSet;
/**
* Translates UI gestures to scroll actions.
*
* @author hearnden@google.com (David Hearnden)
*/
public final class ScrollHandler implements KeySignalHandler {
private final ScrollController controller;
/**
* Creates a scroll controller.
*/
private ScrollHandler(ScrollController controller) {
this.controller = controller;
}
public static ScrollHandler install(WavePanel panel, ScrollPanel<?> scroller) {
ScrollHandler c = new ScrollHandler(new ScrollController(scroller));
panel.getKeyRouter().register(
EnumSet.of(KeyCombo.PAGE_UP, KeyCombo.PAGE_DOWN, KeyCombo.HOME, KeyCombo.END), c);
return c;
}
@Override
public boolean onKeySignal(KeyCombo key) {
switch (key) {
case PAGE_UP:
controller.pageUp();
return true;
case PAGE_DOWN:
controller.pageDown();
return true;
case HOME:
controller.home();
return true;
case END:
controller.end();
return true;
default:
throw new RuntimeException();
}
}
}