fable.framework.ui.internal.MainStatusBar.java Source code

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Here is the source code for fable.framework.ui.internal.MainStatusBar.java

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/*
 * Copyright (c) 2012 European Synchrotron Radiation Facility,
 *                    Diamond Light Source Ltd.
 *
 * 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 fable.framework.ui.internal;

import org.eclipse.jface.action.ContributionItem;
import org.eclipse.jface.action.IContributionManager;
import org.eclipse.jface.action.StatusLineLayoutData;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;

/**
 * This is a status bar for fable.
 * This class allows fable to add text and images to the main status bar.
 * @author SUCHET
 *
 */
public class MainStatusBar extends ContributionItem {
    public final static int DEFAULT_CHAR_WIDTH = 40;
    public final static int DEFAULT_CHAR_HEIGHT = 40;

    private CLabel label;

    private Image image;

    private String text = ""; //$NON-NLS-1$

    private int widthHint = -1;

    private int heightHint = -1;

    private Listener listener;

    private int eventType;

    private String tooltip;

    /**
     * @param id
     */
    public MainStatusBar(String id) {
        this(id, DEFAULT_CHAR_WIDTH);
    }

    public MainStatusBar(String id, int default_char_width2) {
        super(id);
        this.widthHint = default_char_width2;

        setVisible(false); // no text to start with
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.ContributionItem#dispose()
     */
    public void dispose() {
        // TODO Auto-generated method stub
        super.dispose();
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.ContributionItem#fill(org.eclipse.swt.widgets.Composite)
     */
    public void fill(Composite parent) {
        Label sep = new Label(parent, SWT.SEPARATOR);
        label = new CLabel(parent, SWT.SHADOW_NONE);

        GC gc = new GC(parent);
        gc.setFont(parent.getFont());
        FontMetrics fm = gc.getFontMetrics();
        Point extent = gc.textExtent(text);

        int nwidthHint;

        if (widthHint > 0) {
            nwidthHint = fm.getAverageCharWidth() * widthHint;
        } else {
            nwidthHint = extent.x;
        }
        heightHint = fm.getHeight();
        gc.dispose();

        StatusLineLayoutData statusLineLayoutData = new StatusLineLayoutData();
        statusLineLayoutData.widthHint = nwidthHint;
        statusLineLayoutData.heightHint = heightHint;
        label.setLayoutData(statusLineLayoutData);
        label.setText(text);
        label.setImage(image);
        if (listener != null) {
            label.addListener(eventType, listener);
        }
        if (tooltip != null) {
            label.setToolTipText(tooltip);
        }

        statusLineLayoutData = new StatusLineLayoutData();
        statusLineLayoutData.heightHint = heightHint * 2;
        sep.setLayoutData(statusLineLayoutData);
    }

    public void setText(String txt) {
        if (txt != null) {
            this.text = txt;

            if (label != null && !label.isDisposed())
                label.setText(this.text);

            if (this.text.length() == 0) {
                if (isVisible()) {
                    setVisible(false);
                    IContributionManager contributionManager = getParent();

                    if (contributionManager != null)
                        contributionManager.update(true);
                }
            } else {
                if (!isVisible()) {
                    setVisible(true);
                    IContributionManager contributionManager = getParent();

                    if (contributionManager != null)
                        contributionManager.update(true);
                }
            }
        }
    }

    public void setTooltip(String tooltip) {
        if (tooltip == null)
            throw new NullPointerException();

        this.tooltip = tooltip;

        if (label != null && !label.isDisposed()) {
            label.setToolTipText(this.tooltip);
        }
    }

    public void setImage(Image image) {
        if (image == null)
            throw new NullPointerException();

        this.image = image;

        if (label != null && !label.isDisposed())
            label.setImage(this.image);

        if (!isVisible()) {
            setVisible(true);
            IContributionManager contributionManager = getParent();

            if (contributionManager != null)
                contributionManager.update(true);
        }
    }
}