menu.java

国外的j2me播放器软件

package no.auc.one.portableplayer.userinterface;

import java.util.*;
import javax.microedition.lcdui.*;
import org.apache.log4j.Logger;

public class Menu extends Canvas {
    private static Logger LOG = Logger.getLogger("MENU");

    /**
     * Specifies the height of each MenuElementBase.
     */
    public static final int menuElementHeight = 18;

    private int maxCurrentMenuElements = 0;
    private int topIndex = 0;
    
    private int[] colorBackground = null;
    private int[] colorMarker = null;
    
    private MenuElementContainer currentContainer = null;
    
    Vector menuEventListeners = null;

    int lastX = -1;
    int lastY = -1;
    String lastAction = "";

    public Menu () {
        System.out.println("Menu ctor");
        
        colorBackground = new int[]{135, 206, 235};
        colorMarker = new int[]{155, 226, 255};
        
        maxCurrentMenuElements = (int)Math.floor(
            (double)getHeight() / (double)menuElementHeight) - 1;
        LOG.debug("Max Curr ME: " + maxCurrentMenuElements);
	
        LOG.debug("Supports repeat? " + hasRepeatEvents());
        LOG.debug("Supports pointer press/release? " + hasPointerEvents());
        LOG.debug("Supports pointer motion? " + hasPointerMotionEvents());
    }

    public void setCurrentContainer(MenuElementContainer container) {
        currentContainer = container;
        repaint();
    }

    public MenuElementContainer getCurrentContainer() {
        return currentContainer;
    }

    public int getTopIndex() {
        return topIndex;
    }
   
    public int getMaxCurrentMenuElements() {
        return maxCurrentMenuElements;
    }

    protected void paint(Graphics g) {
        g.setColor(colorBackground[0], colorBackground[1], colorBackground[2]);
        g.fillRect(0, 0, g.getClipWidth(), g.getClipHeight());
        
        g.setColor(colorMarker[0], colorMarker[1],colorMarker[2]);
        g.fillRoundRect(
            5, 
            ((currentContainer.getMarkerPosition() + 1) * 18) - 10,
            g.getClipWidth() - 10, 
            20, 
            5, 
            5);
            
        g.setColor(0, 0, 0);

        int oldX = g.getClipX();
        int oldY = g.getClipY();
        int oldHeight = g.getClipHeight();
        int oldWidth = g.getClipWidth();
	
        g.setClip(
            10, 
            10, 
            oldWidth - 10, 
            maxCurrentMenuElements * menuElementHeight);
        currentContainer.paintChildren(g);

        /*
        for (int i = listMarker; i < (listMarker + menuElementLimiter); i++) {
            g.setClip(
                10, 
                10 + (i * menuElementHeight), 
                oldWidth - 10, 
                menuElementHeight);
            currentMenuElements[i].paint(g);
        }
        */

        g.setClip(oldX, oldY, oldHeight, oldWidth);

        /* XXX Info for debugging pointer action
        g.drawString(
            "Last: " + lastAction + "(" + lastX + ", " + lastY + ")",
            0,
            oldHeight - 50,
            Graphics.LEFT | Graphics.BOTTOM);
        */
    }
    
    protected void keyPressed (int keyCode) {
        // System.out.println("Key pressed: " + keyCode);
        
        //MenuElement me = currentMenuElements[markerPosition+listMarker];

        //
        // Action invocation
        // 
        if (keyCode == KEY_NUM5 || getGameAction(keyCode) == FIRE) {
            currentContainer.invokeAction();
            
        //
        // Navigate Right
        // 
        } else if (keyCode == KEY_NUM6 || getGameAction(keyCode) == RIGHT) {
            currentContainer.navigateRight();
            
        //
        // Navigate Left
        // 
        } else if (keyCode == KEY_NUM4 || getGameAction(keyCode) == LEFT) {
            currentContainer.navigateLeft();
                
        //
        // Navigate Up
        // 
        } else if (keyCode == KEY_NUM2 || getGameAction(keyCode) == UP) {
            currentContainer.navigateUp();
            
        //
        // Navigate Down
        // 
        } else if (keyCode == KEY_NUM8 || getGameAction(keyCode) == DOWN) {
            currentContainer.navigateDown();
        }

        repaint();
    }
        
    protected void keyReleased (int keyCode) {
        // System.out.println("Key released: " + keyCode);
    }

    // TODO Should support this in the future, for easier navigation
    protected void keyRepeated (int keyCode) {
        System.out.println("*** Key repeated: " + keyCode + "***");
    }

    /**
     * If the user presses the pointer for a long time (2 sec?) then 
     * display a context menu.
     */
    protected void pointerPressed(int x, int y) {
        long pointerPressStart = java.lang.System.currentTimeMillis();
        
        System.out.println(
            "Pointer pressed! (" + pointerPressStart + 
            ") (" + x + ", " + y + ")");
        //lastX = x;
        //lastY = y;

        repaint();
    }

    /*
    protected void pointerDragged(int x, int y) {
        //System.out.println("Pointer dragged!");
    }
    */

    protected void pointerReleased(int x, int y) {
        // if (pointerPressStart >= someAmount) { }

        // Detect which MenuElement was hit
        // Only the y-axis is important
        
        // Each MenuElement should be 20 pixels high, and be positioned 
        // at ((index + 1) * 18) - 10 pixel.
        int index = (int)(y / 20.0);

        lastAction = "ix=" + index;   
        
        if (index >= currentContainer.childrenLength()) {
            return;
        }

        /*

           for double clicking...
           
        MenuElement me = currentMenuElements[index];
        int ret = me.menuAction();
        handleActionOrIntoReturnCode(ret, me);
        */
        
        lastX = x;
        lastY = y;

        repaint();
    }

    protected void sizeChanged(int w, int h) {
        LOG.debug("Size changed (" + w + ", " + h + ")");

        maxCurrentMenuElements = (int)Math.floor(
            (double)h / (double)menuElementHeight) - 1;
        
        LOG.debug("New height: " + h);
        LOG.debug("Max Curr ME: " + maxCurrentMenuElements);
        
        repaint();
    }
}