ZoomInOutHandler.java

/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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 com.motorola.studio.android.emulator.ui.handlers;

import java.util.Map;

import org.eclipse.ui.IViewPart;

import com.motorola.studio.android.common.utilities.EclipseUtils;
import com.motorola.studio.android.emulator.core.model.IAndroidEmulatorInstance;
import com.motorola.studio.android.emulator.ui.view.AbstractAndroidView;
import com.motorola.studio.android.emulator.ui.view.AndroidViewData;

/**
 * This class is responsible for increasing the default zoom factor 
 * to the current viewer of the Main Display View. 
 */
public class ZoomInOutHandler extends AbstractZoomHandler
{
    /*
     * (non-Javadoc)
     * @see com.motorola.studio.android.emulator.ui.handlers.AbstractZoomHandler#getZoomFactor(java.util.Map)
     */
    @SuppressWarnings("rawtypes")
    @Override
    protected double getZoomFactor(Map parameters)
    {
        double zoomFactor = DEFAULT_ZOOM;
        IAndroidEmulatorInstance instance = AbstractAndroidView.getActiveInstance();
        String viewId = (String) parameters.get(ACTIVE_VIEW_PARAMETER);
        String changeFactorString = (String) parameters.get(ZOOM_CHANGE_FACTOR_PARAMETER);

        if ((instance != null) && (viewId != null) && (changeFactorString != null))
        {
            IViewPart viewPart = EclipseUtils.getActiveView(viewId);
            if (viewPart instanceof AbstractAndroidView)
            {
                AbstractAndroidView view = (AbstractAndroidView) viewPart;
                double currentZoomFactor = view.getZoomFactor(instance);

                try
                {
                    double changeZoomFactor = Double.parseDouble(changeFactorString);
                    zoomFactor = currentZoomFactor + changeZoomFactor;
                }
                catch (Exception e)
                {
                    zoomFactor = currentZoomFactor;
                }
            }
        }

        if (zoomFactor < MINIMUM_ZOOM)
        {
            zoomFactor = MINIMUM_ZOOM;
        }
        else if (zoomFactor > MAXIMUM_ZOOM)
        {
            zoomFactor = MAXIMUM_ZOOM;
        }

        return zoomFactor;
    }

    /*
     * (non-Javadoc)
     * @see com.motorola.studio.android.emulator.ui.handlers.AbstractZoomHandler#testZoomFactor(com.motorola.studio.android.emulator.ui.view.AndroidViewData, java.util.Map, double)
     */
    @SuppressWarnings("rawtypes")
    @Override
    protected boolean testZoomFactor(AndroidViewData viewData, Map parameters, double zoomFactor)
    {
        // It does not make sense to set as checked any of the UI Elements that use the zoom in/out command
        // Those elements do not represent states, but actions.
        return false;
    }
}