org.caleydo.core.internal.cmd.ZoomHandler.java Source code

Introduction

Here is the source code for org.caleydo.core.internal.cmd.ZoomHandler.java

Source

/*******************************************************************************
 * Caleydo - Visualization for Molecular Biology - http://caleydo.org
 * Copyright (c) The Caleydo Team. All rights reserved.
 * Licensed under the new BSD license, available at http://caleydo.org/license
 *******************************************************************************/
package org.caleydo.core.internal.cmd;

import org.apache.commons.lang.StringUtils;
import org.caleydo.core.view.internal.MyPreferences;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.jface.preference.IPreferenceStore;

public class ZoomHandler extends AbstractHandler implements IHandler {
    private static final int CHANGE = 20; // 20 %

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        String action = event.getParameter("action");
        final boolean reset = StringUtils.equalsIgnoreCase(action, "reset");
        final boolean increaseZoomFactor = StringUtils.containsIgnoreCase(action, "in");

        final IPreferenceStore prefs = MyPreferences.prefs();
        int current = prefs.getInt(MyPreferences.VIEW_ZOOM_FACTOR);

        int next;
        if (reset)
            next = prefs.getDefaultInt(MyPreferences.VIEW_ZOOM_FACTOR);
        else if (increaseZoomFactor)
            next = current + CHANGE;
        else
            next = Math.max(10, current - CHANGE);

        MyPreferences.prefs().setValue(MyPreferences.VIEW_ZOOM_FACTOR, next);

        return null;
    }
}