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

Java Source | 1998-03-18 | 23.9 KB | 774 lines

package symantec.itools.awt;

import java.awt.Rectangle;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.Graphics;
import java.beans.PropertyVetoException;
import java.beans.PropertyChangeListener;
import java.beans.VetoableChangeListener;
import java.beans.PropertyChangeEvent;
import java.lang.IllegalArgumentException;
import symantec.itools.awt.util.ColorUtils;
import java.util.ResourceBundle;

//    01/29/97    TWB    Integrated changes from Windows
//    05/23/97    LAB    Updated to support Java 1.1
//    06/27/97    LAB    Changed the way the button is drawn.  Now it uses the offscreen
//                    Image.  Cleaned up the drawing code to be more universal.
//                    Added the ArrowColor property to allow the arrow to have a
//                    user definable color.  The disabled color is derived from this color.
//    07/02/97    LAB    Constrained the Arrow Indent Property, so the arrow wouldn't draw strangely
//                    if the inset was set to a large value.
//    07/08/97    LAB    Changed the preferedSize() method to return a button whose arrow is 20 by 20.
//    07/13/97    RKM    Fixed misspelling of prefered
//    07/19/97    LAB    Replaced updatePolygon with fillTriangle and changed the drawing method from
//                    using a polygon to using lines because polygons were problematic.  Changed
//                    getPreferredSize to return the smallest size which the button looks good and
//                    changed getMinimumSize to return the smallest possible size for the button and
//                    still be recognized as a DirectionButton.
//  07/25/97    CAR marked fields transient as needed
//                  innerclasses implement java.io.Serializable
//    10/05/97    LAB    Changed names of strings in PropertyChangeEvent handling to follow Bean Spec
//                    naming conventions.  Added mechanism for internally constrained properties
//                    to be validated after the component is added to the form to avoid code-gen
//                    order specific dependencies.
//    10/06/97    LAB    Initialized tempIndent to indent which resolves shrinkTriangle
//                    and setArrowIndent conflicts (Addresses Mac Bug #9014).  Changed
//                    addNotify to call it's super after listeners are hooked up so
//                    verifyContstrainedPropertyValues will be called after the listeners
//                    are hooked up.  Changed setArrowIndent to set the temp value to the
//                    current value when changing the current value.  Changed
//                    getBevelHeight to return the temp value if the component is not
//                    added.  This fixes a problem at design time where the component would
//                    revert to it's default state after a back run

/**
 * The DirectionButton is a button component that has an arrow drawn in it that
 * points one of four ways (left, up, right, or down). At runtime, the button has
 * a raised look and a pressed look.
 * <p>
 * This component is usually used in conjunction with a combo or list box to
 * indicate a list that the user can view by clicking the arrow, or with spinners
 * to let the user scroll through available values.
 * <p>
 * @version 1.1, June 27, 1997
 * @author  Symantec
 */
public class DirectionButton extends ButtonBase implements java.io.Serializable
{
    /**
     * The point LEFT style constant.
     */
    public static final int LEFT = 0;

    /**
     * The point RIGHT style constant.
     */
    public static final int RIGHT = 1;

    /**
     * The point UP style constant.
     */
    public static final int UP = 2;

    /**
     * The point DOWN style constant.
     */
    public static final int DOWN = 3;

    /**
     * Constructs a default DirectionButton, which will point left.
     */
    public DirectionButton()
    {
        this(LEFT);
    }

    /**
     * Constructs a DirectionButton pointing the specified direction.
     * @param d a style constant indicating which direction to point the button
     * @see #LEFT
     * @see #UP
     * @see #RIGHT
     * @see #DOWN
     */
    public DirectionButton(int d)
    {
        direction     = d;
        left         = 0;
        right        = 0;
        bottom        = 0;
        indent        = 0;
        tempIndent    = indent;
        try { setArrowColor(Color.black); } catch (PropertyVetoException exc) {}

    }

    /**
     * Sets the direction of the arrow after construction.
     * @param d constant indicating direction to point button
     * @exception PropertyVetoException
     * if the specified property value is unacceptable
     * @see #getDirection
     * @see #LEFT
     * @see #UP
     * @see #RIGHT
     * @see #DOWN
     */
    public void setDirection(int d) throws PropertyVetoException
    {
        if(direction != d)
        {
            Integer oldValue = new Integer(direction);
            Integer newValue = new Integer(d);

            vetos.fireVetoableChange("direction", oldValue, newValue);

            direction = d;
            repaint();

            changes.firePropertyChange("direction", oldValue, newValue);
        }
    }

    /**
     * Returns the direction the button is currently pointing.
     * @see #setDirection
     * @see #LEFT
     * @see #UP
     * @see #RIGHT
     * @see #DOWN
     */
    public int getDirection()
    {
        return direction;
    }

    /**
     * Sets the amount of blank space between the arrow and the button
     * border in pixels.
     * @param ai the margin around the arrow in pixels. 0=arrow takes up entire button
     * @exception PropertyVetoException
     * if the specified property value is unacceptable
     * @see #getArrowIndent
     */
    public void setArrowIndent(int ai) throws PropertyVetoException
    {
        if(isAdded)
        {
            if(indent != ai)
            {
                Integer oldValue = new Integer(indent);
                Integer newValue = new Integer(ai);

                vetos.fireVetoableChange("arrowIndent", oldValue, newValue);

                indent = ai;
                tempIndent = ai;
                //Make sure that changes to indent don't make changes to shrinkTriangle
                //give us a bad triangle.
                shrinkTriangle(left, right, top, bottom);
                repaint();

                changes.firePropertyChange("arrowIndent", oldValue, newValue);
            }
        }
        //We store the value until we are added then set the value to avoid code-gen order dependencies.
        else
        {
            tempIndent = ai;
        }
    }

    /**
     * Sets the color of the direction arrow.
     * @param newValue the new arrow color.
     * @exception PropertyVetoException
     * if the specified property value is unacceptable
     * @see #getArrowColor
     */
    public void setArrowColor(Color newValue) throws PropertyVetoException
    {
        if (!symantec.itools.util.GeneralUtils.objectsEqual(arrowColor, newValue))
        {
            Color oldValue = arrowColor;

            vetos.fireVetoableChange("arrowColor", oldValue, newValue);

            arrowColor = newValue;
            try
            {
                disabledArrowColor = ColorUtils.fade(arrowColor, Color.lightGray, 0.50);
            }
            catch (IllegalArgumentException exc) {}

            repaint();

            changes.firePropertyChange("arrowColor", oldValue, newValue);
        }
    }

    /**
     * Gets the current color of the direction arrow.
     * @return the current arrow color
     * @see #setArrowColor
     */
    public Color getArrowColor()
    {
        return arrowColor;
    }

    /**
     * Returns the amount of blank space between the arrow and the button
     * border in pixels.
     * @see #setArrowIndent
     */
    public int getArrowIndent()
    {
        return isAdded ? indent : tempIndent;
    }

    /**
     * Sets the extra amount, in pixels, to shrink the arrow triangle.
     * Constrains the values such that the arrow will never be less than
     * three pixels.  If a value is entered that would exceed this limit,
     * the limit will be used instead.
     * @param left pixels to shrink from left side
     * @param right pixels to shrink from right side
     * @param top pixels to shrink from top
     * @param bottom pixels to shrink from bottom
     */
    public void shrinkTriangle(int l, int r, int t, int b)
    {
        if(isAdded)
        {
            Dimension s = getSize();
            int maxWidth    = s.width - bevel - bevel - 2;
            int maxHeight    = s.height - bevel - bevel - 2;

            if(maxWidth - (l + r + indent + indent) >= 3)
            {
                left    = l;
                right    = r;
            }
            else
            {
                left    = (maxWidth - indent - indent - 3) / 2;
                right    = left;
            }

            if(maxHeight - (t + b + indent + indent) >= 3)
            {
                top        = t;
                bottom    = b;
            }
            else
            {
                top    = (maxHeight - indent - indent - 3) / 2;
                bottom    = top;
            }
        }
    }

    /**
     * Returns the recommended dimensions to properly display this component.
     * This is a standard Java AWT method which gets called to determine
     * the recommended size of this component.
     *
     * @return a button that has a content area of 7 by 7 pixels.
     * @see java.awt.Component#getMinimumSize
     */
    public Dimension getPreferredSize()
    {
        Dimension defaultSize = super.getPreferredSize();

        return new Dimension(defaultSize.width + 7, defaultSize.height + 7);
    }

    /**
     * Returns the minimum dimensions to properly display this component.
     * This is a standard Java AWT method which gets called to determine
     * the minimum size of this component.
     *
     * @return a button that has a content area of 3 by 3 pixels.
     * @see java.awt.Component#getMinimumSize
     */
    public Dimension getMinimumSize()
    {
        Dimension defaultSize = super.getPreferredSize();

        return new Dimension(defaultSize.width + 3, defaultSize.height + 3);
    }

    /**
     * Tells this component that it has been added to a container.
     * This is a standard Java AWT method which gets called by the AWT when
     * this component is added to a container. Typically, it is used to
     * create this component's peer.
     *
     * It has been overridden here to hook-up event listeners.
     *
     * @see #removeNotify
     */
    public synchronized void addNotify()
    {
        errors = ResourceBundle.getBundle("symantec.itools.resources.ErrorsBundle");

        //Hook up listeners
        if (sizeVeto == null)
        {
            sizeVeto = new SizeVeto();
            addDirectionListener(sizeVeto);
        }
        if (indentVeto == null)
        {
            indentVeto = new IndntVeto();
            addArrowIndentListener(indentVeto);
        }

        //Add after the listeners are hooked up
        super.addNotify();
    }

    /**
     * Tells this component that it is being removed from a container.
     * This is a standard Java AWT method which gets called by the AWT when
     * this component is removed from a container. Typically, it is used to
     * destroy the peers of this component and all its subcomponents.
     *
     * It has been overridden here to unhook event listeners.
     *
     * @see #addNotify
     */
    public synchronized void removeNotify()
    {
        //Unhook listeners
        if (sizeVeto != null)
        {
            removeDirectionListener(sizeVeto);
            sizeVeto = null;
        }
        if (indentVeto != null)
        {
            removeArrowIndentListener(indentVeto);
            indentVeto = null;
        }

        super.removeNotify();
    }

    /**
     * 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);
    }

    /**
     * Adds a listener for the Direction property changes.
     * @param listener the listener to add.
     * @see #removeDirectionListener
     */
    public synchronized void addDirectionListener(PropertyChangeListener listener)
    {
        changes.addPropertyChangeListener("direction", listener);
    }

    /**
     * Removes a listener for the Direction property changes.
     * @param listener the listener to remove.
     * @see #addDirectionListener
     */
    public synchronized void removeDirectionListener(PropertyChangeListener listener)
    {
        changes.removePropertyChangeListener("direction", listener);
    }

    /**
     * Adds a vetoable listener for the Direction property changes.
     * @param listener the listener to add.
     * @see #removeDirectionListener
     */
    public synchronized void addDirectionListener(VetoableChangeListener listener)
    {
        vetos.addVetoableChangeListener("direction", listener);
    }

    /**
     * Removes a vetoable listener for the Direction property changes.
     * @param listener the listener to remove.
     * @see #addDirectionListener
     */
    public synchronized void removeDirectionListener(VetoableChangeListener listener)
    {
        vetos.removeVetoableChangeListener("direction", listener);
    }

    /**
     * Adds a listener for the ArrowIndent property changes.
     * @param listener the listener to add.
     * @see #removeArrowIndentListener
     */
    public synchronized void addArrowIndentListener(PropertyChangeListener listener)
    {
        changes.addPropertyChangeListener("arrowIndent", listener);
    }

    /**
     * Removes a listener for the ArrowIndent property changes.
     * @param listener the listener to remove.
     * @see #addArrowIndentListener
     */
    public synchronized void removeArrowIndentListener(PropertyChangeListener listener)
    {
        changes.removePropertyChangeListener("arrowIndent", listener);
    }

    /**
     * Adds a vetoable listener for the ArrowIndent property changes.
     * @param listener the listener to add.
     * @see #removeArrowIndentListener
     */
    public synchronized void addArrowIndentListener(VetoableChangeListener listener)
    {
        vetos.addVetoableChangeListener("arrowIndent", listener);
    }

    /**
     * Removes a vetoable listener for the ArrowIndent property changes.
     * @param listener the listener to remove.
     * @see #addArrowIndentListener
     */
    public synchronized void removeArrowIndentListener(VetoableChangeListener listener)
    {
        vetos.removeVetoableChangeListener("arrowIndent", listener);
    }

    /**
     * This is the PropertyChangeEvent handling inner class for the constrained Direction property.
     * Handles vetoing Directions that are not valid.
     */
    class SizeVeto implements java.beans.VetoableChangeListener, java.io.Serializable
    {
        /**
         * This method gets called when an attempt to change the constrained Direction property is made.
         * Ensures the given direction size is valid for this button.
         *
         * @param     e a <code>PropertyChangeEvent</code> object describing the
         *             event source and the property that has changed.
         * @exception PropertyVetoException if the recipient wishes the property
         *              change to be rolled back.
         */
        public void vetoableChange(PropertyChangeEvent e) throws PropertyVetoException
        {
            int i = ((Integer)e.getNewValue()).intValue();
            if (!isValidDirection(i))
            {
                throw new PropertyVetoException(errors.getString("InvalidDirection") + i, e);
            }
        }
    }

    /**
     * This is the PropertyChangeEvent handling inner class for the constrained ArrowIndent property.
     * Handles vetoing ArrowIndents that are not valid.
     */
    class IndntVeto implements java.beans.VetoableChangeListener, java.io.Serializable
    {
        /**
         * This method gets called when an attempt to change the constrained ArrowIndent property is made.
         * Ensures the given arrow indent size is valid for this button.
         *
         * @param     e a <code>PropertyChangeEvent</code> object describing the
         *             event source and the property that has changed.
         * @exception PropertyVetoException if the recipient wishes the property
         *              change to be rolled back.
         */
        public void vetoableChange(PropertyChangeEvent e) throws PropertyVetoException
        {
            int i = ((Integer)e.getNewValue()).intValue();
            if (!isValidArrowIndent(i))
            {
                throw new PropertyVetoException(errors.getString("InvalidArrowIndent") + i, e);
            }
        }
    }


    /**
     * Maintains the buttonImage size and draws the
     * button in the buttonImage offscreen image.
     * @see symantec.itools.awt.ButtonBase#updateButtonImage
     */
    protected void updateButtonImage()
    {
        super.updateButtonImage();
        Graphics g        = buttonImage.getGraphics();
        Dimension s        = size();;
        int trueBevel    = bevel + 1;
        int centerHorizontal;
        int centerVertical;
        int topSide;
        int bottomSide;
        int leftSide;
        int rightSide;

        if(isEnabled())
        {
            g.setColor(arrowColor);
        }
        else
        {
            g.setColor(disabledArrowColor);
        }

        centerHorizontal    = ((s.width - 1) / 2)                    + pressedAdjustment;
        centerVertical        = ((s.height - 1) / 2)                    + pressedAdjustment;
        topSide                = (top + trueBevel - 1)                    + pressedAdjustment  + indent;
        bottomSide            = (s.height - 1 - bottom - trueBevel)    + pressedAdjustment  - indent;
        leftSide            = (left + trueBevel - 1)                + pressedAdjustment  + indent;
        rightSide            = (s.width - 1 - right - trueBevel)        + pressedAdjustment  - indent;

        if (symantec.itools.lang.OS.isMacintosh())
        {
            leftSide    += 1;
            topSide        += 1;
        }

        switch (direction)
        {
            case UP:
            {
                fillTriangle(g, centerHorizontal, topSide, leftSide, bottomSide, rightSide, bottomSide, direction);
                break;
            }
            case DOWN:
            {
                fillTriangle(g, centerHorizontal, bottomSide, leftSide, topSide, rightSide, topSide, direction);
                break;
            }

            case LEFT:
            {
                fillTriangle(g, leftSide, centerVertical, rightSide, bottomSide, rightSide, topSide, direction);
                break;
            }

            case RIGHT:
            {
                fillTriangle(g, rightSide, centerVertical, leftSide, bottomSide, leftSide, topSide, direction);
                break;
            }
        }
        if (g != null)
            g.dispose();
    }

    /**
     * Fills a triangle which has at least one side that is straight up and down or left and right.
     * @param g the Graphics to use to draw with.
     * @param tipX the horizontal coordinate of the point opposite a straight side.
     * @param tipY the vertical coordinate of the point opposite a straight side.
     * @param aX the horizontal coordinate of one of the two points defining the straight side.
     * @param aY the vertical coordinate of one of the two points defining the straight side.
     * @param bX the horizontal coordinate of one of the two points defining the straight side.
     * @param bY the vertical coordinate of one of the two points defining the straight side.
     * @param direction the direction of the straight line UP, DOWN, or LEFT, RIGHT.
     *
     * aX and bX should be the same for UP or Down.  aY and bY should be the same for LEFT or RIGHT.
     * If not, then the a coordinates are used.
     *
     * @see #UP
     * @see #DOWN
     * @see #LEFT
     * @see #RIGHT
     */
    protected void fillTriangle(Graphics g, int tipX, int tipY, int aX, int aY, int bX, int bY, int direction)
    {
        int dist, max, min;

        switch(direction)
        {
            case UP:
            case DOWN:
                dist = Math.abs(aX - bX);
                max = Math.max(aX, bX);
                min = Math.min(aX, bX);
                for(int i = min; i <= max; ++i)
                {
                    g.drawLine(tipX, tipY, i, aY);
                }
                break;
            case RIGHT:
            case LEFT:
                dist = Math.abs(aY - bY);
                max = Math.max(aY, bY);
                min = Math.min(aY, bY);
                for(int i = min; i <= max; ++i)
                {
                    g.drawLine(tipX, tipY, aX, i);
                }
                break;
        }
    }

    /**
     * Is the given bevel size valid for this button.
     * @param i the given bevel size
     * @return true if the given bevel size is acceptable, false if not.
     */
    protected boolean isValidBevelSize(int i)
    {
        Dimension s = size();

        int temp = i * 2 + 4;

        if (i < 0 || s.width < temp || s.height < temp)
            return false;
        else
            return true;
    }

    /**
     * Is the given direction valid for this button.
     * @param i the given bevel size
     * @return true if the given direction is acceptable, false if not.
     */
    protected boolean isValidDirection(int i)
    {
        switch(i)
        {
            case LEFT:
            case RIGHT:
            case UP:
            case DOWN:
                return true;
            default:
                return false;
        }
    }

    /**
     * Is the given arrow indent is valid for this button.
     * @param i the given bevel size
     * @return true if the given indent size is acceptable, false if not.
     */
    protected boolean isValidArrowIndent(int i)
    {
        Dimension s = size();

        int temp = (i * 2) + (bevel + 1) * 2 + 4;

        if(i < 0 || s.width < temp || s.height < temp)
            return false;
        else
            return true;
    }

    /**
     * Called after addNotify to set the internally constrined properties to their
     * temporary values to validate them now that the component has been added to the form.
     * This is used to avoid code-gen order dependencies, since VC generates all property
     * manipulating code before adding the component to its container.
     * Subclasses should override this function for any internally constrained properties,
     * and call the super version in the overridden version.
     */
    protected void verifyContstrainedPropertyValues()
    {
        super.verifyContstrainedPropertyValues();
        try { setArrowIndent(tempIndent); } catch (PropertyVetoException exc) { /*Silently verify.*/ }
    }

    /**
     * The color of the arrow in the button.
     */
    protected Color    arrowColor            = null;
    /**
     * The color of the arrow when the button is disabled.
     */
    protected Color    disabledArrowColor    = null;
    /**
     * The direction the arrow points.
     * One of: LEFT, UP, RIGHT, or DOWN.
     * @see #LEFT
     * @see #UP
     * @see #RIGHT
     * @see #DOWN
     */
    protected int        direction;
    /**
     * The number of pixels to shrink the arrow from the left side of the button.
     */
    protected int        left;
    /**
     * The number of pixels to shrink the arrow from the right side of the button.
     */
    protected int        right;
    /**
     * The number of pixels to shrink the arrow from the top side of the button.
     */
    protected int        top;
    /**
     * The number of pixels to shrink the arrow from the bottom side of the button.
     */
    protected int        bottom;
    /**
     * The margin around the arrow in pixels. 0 = arrow takes up entire button.
     */
    protected int        indent;
    /**
     * Internal use.
     * Indent value stored until this component is added to a container.
     * It is then used to set the real indent value.
     * This avoids code-gen order dependencies.
     */
    protected int        tempIndent;
    /**
     * Error strings.
     */
    transient protected ResourceBundle errors;

    private SizeVeto    sizeVeto    = null;
    private IndntVeto    indentVeto    = null;
    private symantec.itools.beans.VetoableChangeSupport vetos = new symantec.itools.beans.VetoableChangeSupport(this);
    private symantec.itools.beans.PropertyChangeSupport changes = new symantec.itools.beans.PropertyChangeSupport(this);
}