表滚动未按预期工作

时间：2013-10-31 11:02:11

标签： java java-me lwuit lwuit-form

我在LWUIT中使用固定标题的某个表上工作。让我直截了当地谈谈这个问题。当我在模拟器上运行它时，触摸界面工作非常精细并且表单的滚动工作完美无瑕，但是当我尝试使用导航键导航它时，按下的左键创建了一个小故障。故障是当我向右导航然后向左导航时，左侧滚动在第二列上发出颤动，无论我按下左键多少次，它都不会向左移动。经过多次努力，我找到了一个组合，在连续按下UP和LEFT键时，表格滚动到最左边。我不明白为什么会这样。我在所有模拟器和2个实际手机上试过它，但仍然是同样的问题。可能有一些代码会产生这种问题吗？我不确定。任何有关这方面的帮助将不胜感激。此外，我发布了整个源代码，以便任何感兴趣的人可以尝试它，并可以看看这个问题是否来自他的模拟器。 

import com.sun.lwuit.Button;
import com.sun.lwuit.Component;
import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.Label;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.geom.Dimension;
import com.sun.lwuit.layouts.BorderLayout;
import com.sun.lwuit.table.DefaultTableModel;
import com.sun.lwuit.table.Table;
import com.sun.lwuit.table.TableModel;
import javax.microedition.lcdui.Canvas;
import javax.microedition.midlet.MIDlet;

public class FixedTableDemo extends MIDlet implements ActionListener {

private static final String[] TITLES = {"Title 1", "Title 2", "Title 3", "Title 4", "Title 5"};
private static final int ROWS = 100;
private static Dimension[] TITLE_SIZES;
Button b[][];



static class MirroredTable extends Table {

   private MirroredTable mirrorTo;

   public MirroredTable(TableModel m) {

       super(m);

   }



   public MirroredTable(TableModel m, boolean b) {

       super(m, b);

   }

   public void setScrollX(int x) {

       super.setScrollX(x);

       if(isDragActivated()) {
           mirrorTo.setScrollX(x);
       }

   }



   /**

    * @param mirrorTo the mirrorTo to set

    */

   public void setMirrorTo(MirroredTable mirrorTo) {
       this.mirrorTo = mirrorTo;
   }



   public Component createCell(Object value, int row, int column, boolean editable) {

       Component c = super.createCell(value, row, column, editable);

       if(TITLE_SIZES != null && TITLE_SIZES[column] != null) {
           c.setPreferredSize(TITLE_SIZES[column]);
       }

       return c;

   }

}

MirroredTable titlesTable;

MirroredTable bodyTable;

public void startApp() {

   Display.init(this);



   Form f = new Form("Table Title");

   titlesTable = new MirroredTable(new DefaultTableModel(TITLES, new Object[0][0]));

   //TITLE_SIZES = new Dimension[TITLES.length];

   /*for(int iter = 0 ; iter < TITLES.length ; iter++) {
    * 
    * TITLE_SIZES[iter] = titlesTable.createCell(TITLES[iter], -1, iter, false).getPreferredSize();
    * 
    * }*/

   titlesTable.removeAll();

   Button bt[]=new Button[5];

   for(int i=0;i<5;i++)
   {
       bt[i]=new Button("Title  "+i);
       bt[i].setUIID("");
       titlesTable.addComponent(bt[i]);
   }


   Object[][] body = new Object[ROWS][TITLES.length];

   /* for(int rows = 0 ; rows < body.length ; rows++) {
    * 
    * for(int cols = 0 ; cols < body[rows].length ; cols++) {
    * 
    * body[rows][cols] = "" + rows + ", " + cols;
    * 
    * }
    * 
    * }*/

   bodyTable = new MirroredTable(new DefaultTableModel(TITLES, body), false);

   bodyTable.setMirrorTo(titlesTable);

   titlesTable.setMirrorTo(bodyTable);

   bodyTable.setScrollable(true);

   titlesTable.setScrollableX(true);

   f.setScrollable(false);

   f.setLayout(new BorderLayout());

   titlesTable.setTensileDragEnabled(false);

   bodyTable.setTensileDragEnabled(false);

   titlesTable.setIsScrollVisible(false);

   f.addComponent(BorderLayout.NORTH, titlesTable);

   f.addComponent(BorderLayout.CENTER, bodyTable);


   f.addGameKeyListener(Canvas.LEFT, this);
   f.addGameKeyListener(Canvas.RIGHT, this);
   f.addGameKeyListener(Canvas.UP, this);

   f.setCyclicFocus(false);


   /**
    * buttons adding and their listener
    */
   b=new Button[50][5];
   //Label l[][]=new Label[50][5];

   for(int i=0;i<50;i++)
     {
     for(int j=0; j<5;j++)
     {
     b[i][j]=new Button("Title "+i);
     b[i][j].setUIID("");
     //l[i][j]=new Label("Title 1");
     bodyTable.addComponent(b[i][j]);

     }
     }





   f.show();

 }

 public void actionPerformed(ActionEvent evt) {
    if(evt.getKeyEvent()==Canvas.LEFT)
    {
        System.out.println(bodyTable.getScrollX());
        titlesTable.setScrollX(bodyTable.getScrollX());

    }
    else if(evt.getKeyEvent()==Canvas.RIGHT)
    {
        System.out.println(bodyTable.getScrollX());
        titlesTable.setScrollX(bodyTable.getScrollX());
    }
    else if(evt.getKeyEvent()==Canvas.UP)
    {
        System.out.println("Up:"+bodyTable.getScrollX()+","+bodyTable.getScrollY());
    }
 }

 public void pauseApp() {

 }



 public void destroyApp(boolean unconditional) {

 }

}

1 个答案:

答案 0 :(得分：1)

我不知道这是否是实现这一目标的准确方法。但我在你的代码中做了一些改动。 看看这个。 

import com.sun.lwuit.Button;
import com.sun.lwuit.Component;
import com.sun.lwuit.Display;
import com.sun.lwuit.Form;
import com.sun.lwuit.events.ActionEvent;
import com.sun.lwuit.events.ActionListener;
import com.sun.lwuit.geom.Dimension;
import com.sun.lwuit.layouts.BorderLayout;
import com.sun.lwuit.table.DefaultTableModel;
import com.sun.lwuit.table.Table;
import com.sun.lwuit.table.TableModel;
import javax.microedition.lcdui.Canvas;
import javax.microedition.midlet.MIDlet;

public class FixedTableDemo extends MIDlet implements ActionListener {

private static final String[] TITLES = {"Title 1", "Title 2", "Title 3", "Title 4", "Title 5"};
private static final int ROWS = 100;
private static Dimension[] TITLE_SIZES;
Button b[][];
int screenWidth;
int lastMove = 0;
int lastModifiedMove = 1;
int temp;

static class MirroredTable extends Table {

    private MirroredTable mirrorTo;

    public MirroredTable(TableModel m) {

        super(m);

    }

    public MirroredTable(TableModel m, boolean b) {

        super(m, b);

    }

    public void setScrollX(int x) {

        super.setScrollX(x);

        if (isDragActivated()) {

            mirrorTo.setScrollX(x);

        }

    }

    /**
     *
     * @param mirrorTo the mirrorTo to set
     *
     */
    public void setMirrorTo(MirroredTable mirrorTo) {

        this.mirrorTo = mirrorTo;

    }

    public Component createCell(Object value, int row, int column, boolean editable) {

        Component c = super.createCell(value, row, column, editable);

        if (TITLE_SIZES != null && TITLE_SIZES[column] != null) {

            c.setPreferredSize(TITLE_SIZES[column]);

        }

        return c;

    }
}
MirroredTable titlesTable;
MirroredTable bodyTable;

public void startApp() {

    Display.init(this);


    screenWidth = Display.getInstance().getDisplayWidth();

    Form f = new Form("Table Title");

    titlesTable = new MirroredTable(new DefaultTableModel(TITLES, new Object[0][0]));
    titlesTable.removeAll();

    Button bt[] = new Button[5];

    for (int i = 0; i < 5; i++) {
        bt[i] = new Button("Title" + (i + 10));
        bt[i].setUIID("");
        titlesTable.addComponent(bt[i]);
    }


    Object[][] body = new Object[ROWS][TITLES.length];

    bodyTable = new MirroredTable(new DefaultTableModel(TITLES, body), false);

    bodyTable.setMirrorTo(titlesTable);

    titlesTable.setMirrorTo(bodyTable);

    bodyTable.setScrollable(true);

    titlesTable.setScrollableX(true);

    f.setScrollable(false);

    f.setLayout(new BorderLayout());

    titlesTable.setTensileDragEnabled(false);

    bodyTable.setTensileDragEnabled(false);

    titlesTable.setIsScrollVisible(false);

    f.addComponent(BorderLayout.NORTH, titlesTable);

    f.addComponent(BorderLayout.CENTER, bodyTable);


    f.addGameKeyListener(Canvas.LEFT, this);
    f.addGameKeyListener(Canvas.RIGHT, this);
    f.addGameKeyListener(Canvas.UP, this);

    f.setCyclicFocus(false);


    /**
     * buttons adding and their listener
     */
    b = new Button[50][5];
    //Label l[][]=new Label[50][5];

    for (int i = 0; i < 50; i++) {
        for (int j = 0; j < 5; j++) {
            b[i][j] = new Button("Title" + (i + 10));
            b[i][j].setUIID("");
            //l[i][j]=new Label("Title 1");
            bodyTable.addComponent(b[i][j]);

        }
    }





    f.show();

}

public void actionPerformed(ActionEvent evt) {


    if (evt.getKeyEvent() == Canvas.LEFT) {
        if (lastMove != 0) {

            lastMove -= 20;

            bodyTable.setScrollX(lastMove);
            titlesTable.setScrollX(lastMove);
        }

    } else if (evt.getKeyEvent() == Canvas.RIGHT) {
        if (lastMove != lastModifiedMove) {

            lastMove += 20;


            bodyTable.setScrollX(lastMove);

            titlesTable.setScrollX(lastMove);

            if (temp == bodyTable.getScrollX()) {

                lastModifiedMove = temp;
                lastMove = temp;

            } else {
                temp = bodyTable.getScrollX();
            }

        } else {
            lastMove = lastModifiedMove;
        }
    } else if (evt.getKeyEvent() == Canvas.UP) {
    }
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}
}
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