table.java

来自「j2me学习 简单例子」· Java 代码 · 共 230 行

package example.demoseniorui.custom;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CustomItem;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;

/**
 * <p>J2ME Table CustomItem Demo</p>
 * 
 * @author 刘光辉
 * @version 2009.02.01
 */
public class Table extends CustomItem implements ItemCommandListener {

	private static final Command CMD_EDIT = new Command("修改",Command.ITEM,1);
	private static final int UPPER = 0;
	private static final int IN = 1;
	private static final int LOWER = 2;
	private Display display;
	private int rows = 4;
	private int cols = 3;
	private int dx = 50;
	private int dy = 20;
	private int location = UPPER;
	private int currentX = 0 ;
	private int currentY = 0 ;
    private String[][] data = new String[rows][cols];
    // Traversal stuff     
    // indicating support of horizontal traversal internal to the CustomItem	
	boolean horz;
    // indicating support for vertical traversal internal to the CustomItem.
	boolean vert;
	
	/**
	 * <p>Table的构造函数</p>
	 */
	public Table(String title,Display d){
		super(title);
		display = d;
		setDefaultCommand(CMD_EDIT);
		setItemCommandListener(this);
		
		int interactionMode = getInteractionModes();
		horz = ((interactionMode & CustomItem.TRAVERSE_HORIZONTAL)!= 0);
		vert = ((interactionMode & CustomItem.TRAVERSE_VERTICAL)!= 0);
	}
	
	protected int getMinContentHeight(){
		return (rows * dy) + 1;
	}
	
	protected int getMinContentWidth(){
		return (cols * dx) + 1;
	}
	
	protected int getPrefContentHeight(int width){
		return (rows * dy) + 1;
	}
	
	protected int getPrefContentWidth(int height){
		return (cols * dx) + 1;
	}
	
	protected void paint(Graphics g,int w,int h){
        for (int i = 0; i <= rows; i++) {
            g.drawLine(0, i * dy, cols * dx, i * dy);
        }

        for (int i = 0; i <= cols; i++) {
            g.drawLine(i * dx, 0, i * dx, rows * dy);
        }
        
        int oldColor = g.getColor();
        g.setColor(0x00D0D0D0);
        g.fillRect((currentX * dx) + 1, (currentY * dy) + 1, dx - 1, dy - 1);
        g.setColor(oldColor);
        
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                if (data[i][j] != null) {
                    // store clipping properties
                    int oldClipX = g.getClipX();
                    int oldClipY = g.getClipY();
                    int oldClipWidth = g.getClipWidth();
                    int oldClipHeight = g.getClipHeight();
                    g.setClip((j * dx) + 1, i * dy, dx - 1, dy - 1);
                    g.drawString(data[i][j], (j * dx) + 2, ((i + 1) * dy) - 2,
                        Graphics.BOTTOM | Graphics.LEFT);

                    // restore clipping properties
                    g.setClip(oldClipX, oldClipY, oldClipWidth, oldClipHeight);
                }
            }
        }
	}
	
    protected boolean traverse(int dir, int viewportWidth, int viewportHeight, int[] visRect_inout) {
        if (horz && vert) {
            switch (dir) {
            case Canvas.DOWN:

                if (location == UPPER) {
                    location = IN;
                } else {
                    if (currentY < (rows - 1)) {
                        currentY++;
                        repaint(currentX * dx, (currentY - 1) * dy, dx, dy);
                        repaint(currentX * dx, currentY * dy, dx, dy);
                    } else {
                        location = LOWER;

                        return false;
                    }
                }

                break;

            case Canvas.UP:

                if (location == LOWER) {
                    location = IN;
                } else {
                    if (currentY > 0) {
                        currentY--;
                        repaint(currentX * dx, (currentY + 1) * dy, dx, dy);
                        repaint(currentX * dx, currentY * dy, dx, dy);
                    } else {
                        location = UPPER;

                        return false;
                    }
                }

                break;

            case Canvas.LEFT:

                if (currentX > 0) {
                    currentX--;
                    repaint((currentX + 1) * dx, currentY * dy, dx, dy);
                    repaint(currentX * dx, currentY * dy, dx, dy);
                }

                break;

            case Canvas.RIGHT:

                if (currentX < (cols - 1)) {
                    currentX++;
                    repaint((currentX - 1) * dx, currentY * dy, dx, dy);
                    repaint(currentX * dx, currentY * dy, dx, dy);
                }
            }
        } else if (horz || vert) {
            switch (dir) {
            case Canvas.UP:
            case Canvas.LEFT:

                if (location == LOWER) {
                    location = IN;
                } else {
                    if (currentX > 0) {
                        currentX--;
                        repaint((currentX + 1) * dx, currentY * dy, dx, dy);
                        repaint(currentX * dx, currentY * dy, dx, dy);
                    } else if (currentY > 0) {
                        currentY--;
                        repaint(currentX * dx, (currentY + 1) * dy, dx, dy);
                        currentX = cols - 1;
                        repaint(currentX * dx, currentY * dy, dx, dy);
                    } else {
                        location = UPPER;

                        return false;
                    }
                }

                break;

            case Canvas.DOWN:
            case Canvas.RIGHT:

                if (location == UPPER) {
                    location = IN;
                } else {
                    if (currentX < (cols - 1)) {
                        currentX++;
                        repaint((currentX - 1) * dx, currentY * dy, dx, dy);
                        repaint(currentX * dx, currentY * dy, dx, dy);
                    } else if (currentY < (rows - 1)) {
                        currentY++;
                        repaint(currentX * dx, (currentY - 1) * dy, dx, dy);
                        currentX = 0;
                        repaint(currentX * dx, currentY * dy, dx, dy);
                    } else {
                        location = LOWER;

                        return false;
                    }
                }
            }
        } else {
            // In case of no Traversal at all: (horz|vert) == 0
        }

        visRect_inout[0] = currentX;
        visRect_inout[1] = currentY;
        visRect_inout[2] = dx;
        visRect_inout[3] = dy;

        return true;
    }

    public void setText(String text) {
        data[currentY][currentX] = text;
        repaint(currentY * dx, currentX * dy, dx, dy);
    }

    public void commandAction(Command c, Item i) {
        if (c == CMD_EDIT) {
            TextInput textInput = new TextInput(data[currentY][currentX], this, display);
            display.setCurrent(textInput);
        }
    }
}