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/*******************************************************************************
* Copyright (c) 2004 - 2006 Mylar committers and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.mylar.internal.tasks.ui.views;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.jobs.IJobChangeEvent;
import org.eclipse.core.runtime.jobs.IJobChangeListener;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
/**
* @author Mik Kersten
*/
public class AdaptiveRefreshPolicy {
private int refreshThreshold = 1500;
private Set<IFilteredTreeListener> listeners = new HashSet<IFilteredTreeListener>();
private Text filterText = null;
private Job refreshJob;
/**
* @param refreshJob
* @param filteredTree can be null
*/
public AdaptiveRefreshPolicy(Job refreshJob, Text filterText) {
this.refreshJob = refreshJob;
this.filterText = filterText;
refreshJob.addJobChangeListener(REFRESH_JOB_LISTENER);
}
public void dispose() {
if (refreshJob != null) {
refreshJob.removeJobChangeListener(REFRESH_JOB_LISTENER);
}
}
private final IJobChangeListener REFRESH_JOB_LISTENER = new IJobChangeListener() {
public void aboutToRun(IJobChangeEvent event) {
// ignore
}
public void awake(IJobChangeEvent event) {
// ignore
}
public void done(IJobChangeEvent event) {
PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
public void run() {
for (IFilteredTreeListener listener : listeners) {
listener.filterTextChanged(filterText.getText());
}
}
});
}
public void running(IJobChangeEvent event) {
// ignore
}
public void scheduled(IJobChangeEvent event) {
// ignore
}
public void sleeping(IJobChangeEvent event) {
// ignore
}
};
public void textChanged(String text) {
if (refreshJob == null)
return;
refreshJob.cancel();
int refreshDelay = 0;
int textLength = text.length();
if (textLength > 0) {
refreshDelay = (int)(refreshThreshold /(textLength*0.6));
}
refreshJob.addJobChangeListener(REFRESH_JOB_LISTENER);
refreshJob.schedule(refreshDelay);
}
public void addListener(IFilteredTreeListener listener) {
listeners.add(listener);
}
public void removeListener(IFilteredTreeListener listener) {
listeners.remove(listener);
}
public void setRefreshDelay(int refreshDelay) {
this.refreshThreshold = refreshDelay;
}
}
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