The Net: Ultimate Internet Guide/WWLCD1.ISO/pc/java/un2maiq4/pjjava/src/pj/awt/dogear.java

Java Source | 1996-08-14 | 5.6 KB | 182 lines

/*---------------------------------------------------------------------------

        Written by the Personal Journal developers of Dow Jones & Company, Inc.

    Dow Jones makes no representations or warranties about
    the suitability of this software, either express or
    implied, including but not limited to the implied warranties
    of merchantability, fitness for a particular purpose,
    or non-infringement.  Dow Jones will not be liable for
    any damages suffered by a user as a result of using,
    modifying or distributing this software or its derivatives.


        @(#)DogEar.java

        The page turner control used to step through the pages of PJ
                one by one.  It has a picture of a dog-eared page, hence the name.
        Maybe, I should have called it PageTurner, se la guerre.


        Authors:

        Ted S.      Ted Skolnick
        jlee        James Lee

        Version Ident:

        $Header$


        History:

        0.00 2-feb-1996 Ted S.     Initial Creation
        0.01 23-Feb-96  Ted S.     Made use of nextView method to turn pages.
              4-Mar-96  jlee       Replace CheckboxNb with TabNotebook.

---------------------------------------------------------------------------*/

package pj.awt;


import pj.awt.PjImages;
import pj.awt.TabNotebook;
import pj.net.RemoteImage;
import pj.net.RemoteString;
import pj.net.RemoteURL;

import java.net.MalformedURLException;
import java.net.URL;
import java.awt.Panel;
import java.awt.*;

/**
 * Fill me in with description
 *
 * @see
 * @see
 * @version 0.00 03-Jan-96
 * @author Ted Skolnick
*/
public class DogEar extends Canvas
        {

        // --- Class variables

        private static final short IDB_PAGE_BOTH            = 0; //both, up
        private static final short IDB_PAGE_RIGHT_DOWN      = 1; // both, right down
        private static final short IDB_PAGE_LEFT_DOWN       = 2;  // both, left down

        private static Image ImageList[];

        private static final int iMinWidth  = 34;
        private static final int iMinHeight = 34;

        // --- Instance variables

        private short miCurrentImage;
        private boolean mbClickPrev;
        private TabNotebook notebook;



        // --- Public constructors
        /**
         * @param ImagesIn - PJ's repository for all images, DogEar takes the ones it needs.
         * @param Notebook - The notebook to step through when a page turner is pressed.
         */
        public DogEar( PjImages ImagesIn, TabNotebook Nb )
                {
                notebook = Nb;

                // Load up DogEar with images.
                ImageList = new Image[3];
                ImageList[IDB_PAGE_BOTH]=
                                ImagesIn.imagespecs()[ PjImages.idxDogEarBothUp ].getImage();
                ImageList[IDB_PAGE_RIGHT_DOWN]=
                                ImagesIn.imagespecs()[ PjImages.idxDogEarRightDown ].getImage();
                ImageList[IDB_PAGE_LEFT_DOWN]=
                                ImagesIn.imagespecs()[ PjImages.idxDogEarLeftDown ].getImage();

                // Init to show both pages in the up position.
                SetImage(IDB_PAGE_BOTH);

                System.out.println("Debug-DogEar:constructed");
                }

        // --- Public operations

        // Draw the control in its current state.
        public void paint( Graphics g )
                {
                g.drawImage( ImageList[ miCurrentImage ], 0, 0, iMinWidth, iMinHeight, this );
                }


        // Make it look like the user pressed down on the page turner,
        //  and remember which side ( prev or next ) was pressed.
        public boolean mouseDown( Event e, int x, int y )
                {
                mbClickPrev = IsOverPrev( x );
                if ( mbClickPrev )
                    {
                    SetImage(IDB_PAGE_LEFT_DOWN);
                    }
                else
                    {
                    SetImage(IDB_PAGE_RIGHT_DOWN);
                    }

                return true;
                }

        // When the user releases the mouse, then tell the notebook to change pages.
        public boolean mouseUp( Event e, int x, int y )
                {

                SetImage(IDB_PAGE_BOTH);
                if (mbClickPrev)
                    notebook.previousView();
                else
                    notebook.nextView();

                return true;
                }


        // Tell java how much space this control requires.
        public Dimension preferredSize()
                {
                //System.out.println("Debug pS ");
                return minimumSize();
                }

        // Tell java how much space this control requires.
        public Dimension minimumSize()
                {
                //System.out.println("Debug Dimension ");
                return new Dimension(iMinWidth,iMinHeight);
                }

        // --- Private operations

        private void SetImage( short nNewImage )
                {
                // Set the current image, and redraw the control.
                miCurrentImage = nNewImage;

                repaint();
                }

        // Is the mouse over the previous button?, if not it is over next.
        private boolean IsOverPrev( int x )
                {
                // The previous button is the left half of the control.
                return ( x < ( iMinWidth/2 ) );
                }


    } // DogEar