org.eclipse.scada.ui.chart.viewer.controller.actions.TimeShiftActionController.java Source code

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Here is the source code for org.eclipse.scada.ui.chart.viewer.controller.actions.TimeShiftActionController.java

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/*******************************************************************************
 * Copyright (c) 2012, 2014 TH4 SYSTEMS GmbH 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
 *
 * Contributors:
 *     TH4 SYSTEMS GmbH - initial API and implementation
 *     IBH SYSTEMS GmbH - enhancements for legends, update labels
 *******************************************************************************/
package org.eclipse.scada.ui.chart.viewer.controller.actions;

import java.util.concurrent.TimeUnit;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.PojoObservables;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.emf.databinding.EMFObservables;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.scada.ui.chart.model.ChartPackage;
import org.eclipse.scada.ui.chart.model.TimeShiftAction;
import org.eclipse.scada.ui.chart.viewer.ChartContext;
import org.eclipse.scada.ui.chart.viewer.XAxisViewer;
import org.eclipse.scada.ui.chart.viewer.controller.ControllerManager;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

public class TimeShiftActionController extends AbstractXAxisController {
    private Button button;

    private long milliseconds;

    private IValueChangeListener layoutListener;

    private IObservableValue labelProperty;

    public TimeShiftActionController(final ControllerManager controllerManager, final ChartContext chartContext,
            final TimeShiftAction controller) {
        super(controllerManager.getContext(), chartContext, controller);

        final DataBindingContext ctx = controllerManager.getContext();

        final Composite space = chartContext.getExtensionSpaceProvider().getExtensionSpace();
        if (space != null) {
            this.button = new Button(space, SWT.PUSH);
            this.button.addSelectionListener(new SelectionAdapter() {
                @Override
                public void widgetSelected(final SelectionEvent e) {
                    action();
                };
            });
            addBinding(ctx.bindValue(PojoObservables.observeValue(this, "milliseconds"), //$NON-NLS-1$
                    EMFObservables.observeValue(controller, ChartPackage.Literals.TIME_SHIFT_ACTION__DIFF)));
            addBinding(ctx.bindValue(SWTObservables.observeText(this.button),
                    EMFObservables.observeValue(controller, ChartPackage.Literals.TIME_SHIFT_ACTION__LABEL)));
            addBinding(ctx.bindValue(SWTObservables.observeTooltipText(this.button),
                    EMFObservables.observeValue(controller, ChartPackage.Literals.TIME_SHIFT_ACTION__DESCRIPTION)));

            this.layoutListener = new IValueChangeListener() {

                @Override
                public void handleValueChange(final ValueChangeEvent event) {
                    space.layout();
                }
            };

            this.labelProperty = EMFObservables.observeValue(controller,
                    ChartPackage.Literals.TIME_SHIFT_ACTION__LABEL);
            this.labelProperty.addValueChangeListener(this.layoutListener);

            space.layout();
        } else {
            this.button = null;
        }
    }

    protected void action() {
        for (final XAxisViewer viewer : getCurrentViewers()) {
            viewer.getAxis().shiftByTimespan(this.milliseconds, TimeUnit.MILLISECONDS);
        }
    }

    @Override
    public void dispose() {
        if (this.button != null) {
            this.button.dispose();
        }
        if (this.labelProperty != null) {
            if (this.layoutListener != null) {
                this.labelProperty.removeValueChangeListener(this.layoutListener);
            }
            this.labelProperty.dispose();
            this.labelProperty = null;
        }
        super.dispose();
    }

    public void setMilliseconds(final long milliseconds) {
        this.milliseconds = milliseconds;
    }

    public long getMilliseconds() {
        return this.milliseconds;
    }

}