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/*******************************************************************************
* Copyright (c) 2013, 2018 Red Hat, Inc.
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Red Hat - initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.systemtap.graphing.ui.widgets;
import org.eclipse.linuxtools.systemtap.graphing.ui.charts.AbstractChartBuilder;
import org.eclipse.linuxtools.systemtap.structures.listeners.IUpdateListener;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.swtchart.IAxis;
import org.swtchart.ISeries;
import org.swtchart.Range;
/**
* @since 3.0
*/
public class GraphDiscreteXControl extends Composite implements IUpdateListener {
private final static double ZOOM_AMOUNT = 2.0;
private AbstractChartBuilder builder;
private Button zoomInButton;
private Button zoomOutButton;
private Button allButton;
private Button leftButton;
private Button rightButton;
private Button firstButton;
private Button lastButton;
public GraphDiscreteXControl(GraphComposite comp, int style) {
super(comp, style);
this.builder = comp.getCanvas();
this.setLayout(new RowLayout());
Font font = new Font(comp.getDisplay(), "Arial", 10, SWT.BOLD); //$NON-NLS-1$
FormData thisData = new FormData();
thisData.bottom = new FormAttachment(100, 0);
thisData.left = new FormAttachment(builder, 0, SWT.LEFT);
this.setLayoutData(thisData);
firstButton = new Button(this, SWT.CENTER);
firstButton.setText(Messages.GraphDiscreteXControl_First);
firstButton.setFont(font);
firstButton.setEnabled(false);
firstButton.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> {
builder.setScroll(0);
firstButton.setEnabled(false);
leftButton.setEnabled(false);
rightButton.setEnabled(true);
lastButton.setEnabled(true);
}));
leftButton = new Button(this, SWT.CENTER);
leftButton.setText(Messages.GraphDiscreteXControl_Left);
leftButton.setFont(font);
leftButton.setEnabled(false);
leftButton.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> stepScroll(-1)));
zoomInButton = new Button(this, SWT.CENTER);
zoomInButton.setText(Messages.GraphDiscreteXControl_ZoomIn);
zoomInButton.setFont(font);
zoomInButton.setEnabled(false);
zoomInButton.addSelectionListener(
SelectionListener.widgetSelectedAdapter(e -> builder.setScale(builder.getScale() / ZOOM_AMOUNT)));
zoomOutButton = new Button(this, SWT.CENTER);
zoomOutButton.setText(Messages.GraphDiscreteXControl_ZoomOut);
zoomOutButton.setFont(font);
zoomOutButton.setEnabled(false);
zoomOutButton.addSelectionListener(
SelectionListener.widgetSelectedAdapter(e -> builder.setScale(builder.getScale() * ZOOM_AMOUNT)));
allButton = new Button(this, SWT.CENTER);
allButton.setText(Messages.GraphDiscreteXControl_All);
allButton.setFont(font);
allButton.setEnabled(false);
allButton.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> builder.setScale(1.0)));
rightButton = new Button(this, SWT.CENTER);
rightButton.setText(Messages.GraphDiscreteXControl_Right);
rightButton.setFont(font);
rightButton.setEnabled(false);
rightButton.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> stepScroll(1)));
lastButton = new Button(this, SWT.CENTER);
lastButton.setText(Messages.GraphDiscreteXControl_Last);
lastButton.setFont(font);
lastButton.setEnabled(false);
lastButton.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> {
builder.setScroll(1);
firstButton.setEnabled(true);
leftButton.setEnabled(true);
rightButton.setEnabled(false);
lastButton.setEnabled(false);
}));
}
private int getNumItems() {
ISeries[] series = builder.getChart().getSeriesSet().getSeries();
return series.length > 0 ? series[0].getXSeries().length : 0;
}
private void stepScroll(int step) {
// Note: scroll buttons are disabled when scale is 100%.
builder.setScroll(builder.getScroll() + step / (double) (getNumItems()) / (1.0 - builder.getScale()));
}
@Override
public void handleUpdateEvent() {
IAxis xAxis = builder.getChart().getAxisSet().getXAxis(0);
Range range = xAxis.getRange();
zoomInButton.setEnabled(range.upper - range.lower > 0);
boolean showingAll = builder.getScale() == 1;
zoomOutButton.setEnabled(!showingAll);
allButton.setEnabled(!showingAll);
boolean hitLeft = showingAll || range.lower == 0;
boolean hitRight = showingAll || range.upper == getNumItems() - 1;
leftButton.setEnabled(!hitLeft);
rightButton.setEnabled(!hitRight);
firstButton.setEnabled(!hitLeft);
lastButton.setEnabled(!hitRight);
}
}
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