CD Ware Multimedia 1999 February/CDW0299.iso/Demos/Cafe/Source.bin/StatusBar.java

Java Source | 1998-03-18 | 5.4 KB | 190 lines

package symantec.itools.awt;

import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.Label;
import java.awt.LayoutManager;
import java.beans.PropertyVetoException;
import java.beans.PropertyChangeListener;
import java.beans.VetoableChangeListener;
import java.beans.PropertyChangeEvent;

// 06/03/97 TGL    Converted to 1.1, added bound/constrained
// 07/18/97 LAB    Made bound and constrained listener registration functions call their super.
//                Cleaned up the code a little.  Addeed version and author tags. Changed
//                incorrect calls to invalidate() to repaint().

/**
 * Use a StatusBar to show document status and other information, like the
 * meaning of a button or other user interface element in a window. Typically,
 * a status bar appears at the bottom of a window.
 *
 * @version 1.1, July 18, 1997
 * @author  Symantec
 */
public class StatusBar extends BorderPanel
{
    /**
     * Constructs a default StatusBar.
     * It is constructed with the BEVEL_LINE style.
     */
    public StatusBar()
    {
        super.setLayout(new BorderLayout());
        add("Center", text = new Label());
    }

    /**
     * Sets the text that is displayed.
     * @param s the new text to display
     * @see #getStatusText
     * @exception PropertyVetoException
     * if the specified property value is unacceptable
     */
    public void setStatusText(String s) throws PropertyVetoException
    {
        if (! symantec.itools.util.GeneralUtils.objectsEqual(text.getText(), s))
        {
            String oldText = text.getText();

            vetos.fireVetoableChange("StatusText", oldText, s);

            text.setText(s);
            repaint();

            changes.firePropertyChange("StatusText", oldText, s);
        }
    }

    /**
     * Gets the text currently displayed.
     * @return the text currently displayed
     * @see #setStatusText
     */
    public String getStatusText()
    {
        return text.getText();
    }

    /**
     * Sets the color of the text that is displayed.
     * @param s the new text color
     * @see #getStatusTextColor
     * @exception PropertyVetoException
     * if the specified property value is unacceptable
     */
    public void setStatusTextColor(Color c) throws PropertyVetoException
    {
        if (! symantec.itools.util.GeneralUtils.objectsEqual(textColor, c))
        {
            Color oldColor = textColor;

            vetos.fireVetoableChange("StatusTextColor", oldColor, c);

            textColor = c;
            text.setForeground(c);
            repaint();

            changes.firePropertyChange("StatusTextColor", oldColor, c);
        }
    }

    /**
     * Gets the text color currently displayed.
     * @return the current color of displayed text
     * @see #setStatusTextColor
     */
    public Color getStatusTextColor()
    {
        return textColor;
    }

    /**
     * Takes no action.
     * This is a standard Java AWT method which gets called to specify
     * which layout manager should be used to layout the components in
     * standard containers.
     *
     * Since layout managers CANNOT BE USED with this container the standard
     * setLayout has been OVERRIDDEN for this container and does nothing.
     *
     * @param l the layout manager to use to layout this container's components
     * (IGNORED)
     * @see java.awt.Container#getLayout
     **/
    public void setLayout(LayoutManager l)
    {
    }

    /**
     * Clears the text that gets displayed.
     * @see #setStatusText
     */
    public void clear()
    {
        try
        {
            setStatusText("");
        }
        catch (PropertyVetoException veto) {}
    }

    /**
     * Adds a listener for all event changes.
     * @param listener the listener to add.
     * @see #removePropertyChangeListener
     */
    public synchronized void addPropertyChangeListener(PropertyChangeListener listener)
    {
        super.addPropertyChangeListener(listener);
        changes.addPropertyChangeListener(listener);
    }

    /**
     * Removes a listener for all event changes.
     * @param listener the listener to remove.
     * @see #addPropertyChangeListener
     */
    public synchronized void removePropertyChangeListener(PropertyChangeListener listener)
    {
        super.removePropertyChangeListener(listener);
        changes.removePropertyChangeListener(listener);
    }

    /**
     * Adds a vetoable listener for all event changes.
     * @param listener the listener to add.
     * @see #removeVetoableChangeListener
     */
    public synchronized void addVetoableChangeListener(VetoableChangeListener listener)
    {
        super.addVetoableChangeListener(listener);
        vetos.addVetoableChangeListener(listener);
    }

    /**
     * Removes a vetoable listener for all event changes.
     * @param listener the listener to remove.
     * @see #addVetoableChangeListener
     */
    public synchronized void removeVetoableChangeListener(VetoableChangeListener listener)
    {
        super.removeVetoableChangeListener(listener);
        vetos.removeVetoableChangeListener(listener);
    }

    /**
     * The text to display.
     */
    protected Label text;
    /**
     * The color of the displayed text.
     */
    protected Color textColor;

    // Private members
    private symantec.itools.beans.VetoableChangeSupport vetos = new symantec.itools.beans.VetoableChangeSupport(this);
    private symantec.itools.beans.PropertyChangeSupport changes = new symantec.itools.beans.PropertyChangeSupport(this);
}