Question

键盘输入有问题。我写了一个KeyActionListener，但只有在我用鼠标点击某个按钮后它才有效，例如，如果我按下鼠标5然后按键盘，我会用键盘按下符号，但是如果我按下键盘上的按键程序启动后我什么都没得到，请帮帮我。

这是我的代码：

package calc;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.part.ViewPart;
import org.eclipse.wb.swt.SWTResourceManager;

public class View extends ViewPart {
    public Text inputText;
    public Text inputText2;
    public Label label;
    public Label label2;
    public Calculation calcul;

    public View()
    {
        calcul = new Calculation();
    }

    public void createPartControl(Composite parent) {
        Composite mainComposite = new Composite(parent, SWT.NONE);
        GridLayout gltop = new GridLayout(1, false);        
        gltop.numColumns = 1;       
        mainComposite.setLayout(gltop);
        //mainComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_BLUE));
        //ВЫзов верхнего и нижнего композита
        createTop(mainComposite);
        createBott(mainComposite);      
    }

    private void createTop(Composite parent)
    {
        GridLayout gltop = new GridLayout(1, false);        
        gltop.numColumns = 1;
        GridData data = new GridData(GridData.FILL_HORIZONTAL);     
        Composite topComposite = new Composite(parent, SWT.NONE);       
        topComposite.setLayout(gltop);
        topComposite.setLayoutData(data);
        //topComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_RED));

        /*inputText = new Text(topComposite, SWT.BORDER);
        inputText.setLayoutData(data);
        inputText.setFont(SWTResourceManager.getFont("", 18, SWT.BOLD));*/
        label = new Label(topComposite,SWT.RIGHT | SWT.BORDER);
        label.setBackground(SWTResourceManager.getColor(SWT.COLOR_WHITE));
        label.setLayoutData(data);
        label.setFont(SWTResourceManager.getFont("", 18, SWT.BOLD));
        label.setText(calcul.output);
    }

    private void createBott(Composite parent)
    {
        GridLayout glbot = new GridLayout(1, false);        
        glbot.numColumns = 2;
        GridData data = new GridData(GridData.FILL_BOTH);       
        Composite botComposite = new Composite(parent, SWT.NONE);       
        botComposite.setLayout(glbot);
        botComposite.setLayoutData(data);
        //botComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_YELLOW));            

        createLeft(botComposite);       
        createRight(botComposite);      
    }

    private void createLeft(Composite parent)
    {           
        Composite leftComposite = new Composite(parent, SWT.NONE);  
        GridLayout glleft = new GridLayout(1, false);       
        GridData data = new GridData(GridData.FILL_BOTH);   
        //glleft.marginTop = 26;
        leftComposite.setLayout(glleft);
        leftComposite.setLayoutData(data);
        //leftComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_CYAN)); 

        label2 = new Label(leftComposite,SWT.BORDER);
        label2.setLayoutData(data);
        Button buttonMC = createFuncDigButtons(leftComposite, data, "M+", 'P');
        Button buttonMR = createFuncDigButtons(leftComposite, data, "M-", 'M');
        Button buttonMS = createFuncDigButtons(leftComposite, data, "MR", 'R');
        Button buttonMpl = createFuncDigButtons(leftComposite, data, "MC", 'c');
    }

    private void createRight(Composite parent)
    {
        GridLayout glright = new GridLayout(1, false);      
        GridData data = new GridData(GridData.FILL_BOTH);       
        Composite rightComposite = new Composite(parent, SWT.NONE);     
        glright.numColumns = 1;
        rightComposite.setLayout(glright);
        rightComposite.setLayoutData(data);
        //rightComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_DARK_GREEN));  

        createRightTop(rightComposite);
        createRightBot(rightComposite);
    }

    private void createRightTop(Composite parent)
    {
        Composite rightTopComposite = new Composite(parent, SWT.NONE);
        GridLayout glltop = new GridLayout(1, false);       
        GridData data = new GridData(GridData.FILL_BOTH);   
        glltop.numColumns = 3;
        glltop.marginBottom = 0;
        glltop.marginTop = 0;
        rightTopComposite.setLayout(glltop);
        rightTopComposite.setLayoutData(data);
        //rightTopComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_DARK_MAGENTA)); 

        Button buttonBack = createFuncDigButtons(rightTopComposite, data, "Backspace", 'B');
        Button buttonC = createFuncDigButtons(rightTopComposite, data, "C", 'C');
        Button buttonCE = createFuncDigButtons(rightTopComposite, data, "CE", 'E');
    }

    private void createRightBot(Composite parent)
    {
        GridLayout glright = new GridLayout(1, false);      
        GridData data = new GridData(GridData.FILL_BOTH);       
        Composite rightBotComposite = new Composite(parent, SWT.NONE);      
        glright.numColumns = 5;
        rightBotComposite.setLayout(glright);
        rightBotComposite.setLayoutData(data);
        //rightBotComposite.setBackground(SWTResourceManager.getColor(SWT.COLOR_DARK_GREEN));       
        Button button7 = createFuncDigButtons(rightBotComposite, data, "7", '7');
        Button button8 = createFuncDigButtons(rightBotComposite, data, "8", '8');
        Button button9 = createFuncDigButtons(rightBotComposite, data, "9", '9');
        Button buttonDev = createFuncDigButtons(rightBotComposite, data, "/", '/');
        Button buttonSQRT = createFuncDigButtons(rightBotComposite, data, "sqrt", 't');
        Button button4 = createFuncDigButtons(rightBotComposite, data, "4", '4');
        Button button5 = createFuncDigButtons(rightBotComposite, data, "5", '5');
        Button button6 = createFuncDigButtons(rightBotComposite, data, "6", '6');
        Button buttonMult = createFuncDigButtons(rightBotComposite, data, "*", '*');
        Button buttonPer = createFuncDigButtons(rightBotComposite, data, "%", '%');
        Button button1 = createFuncDigButtons(rightBotComposite, data, "1", '1');
        Button button2 = createFuncDigButtons(rightBotComposite, data, "2", '2');
        Button button3 = createFuncDigButtons(rightBotComposite, data, "3", '3');
        Button buttonMinus = createFuncDigButtons(rightBotComposite, data, "-", '-');
        Button buttonDev1 = createFuncDigButtons(rightBotComposite, data, "1/x", 'X');
        Button button0 = createFuncDigButtons(rightBotComposite, data, "0", '0');
        Button buttonPM = createFuncDigButtons(rightBotComposite, data, "+/-", 'p');
        Button buttonD = createFuncDigButtons(rightBotComposite, data, ".", '.');       
        Button buttonPlus = createFuncDigButtons(rightBotComposite, data, "+", '+');        
        Button buttonR = createFuncDigButtons(rightBotComposite, data, "=", '=');
    }

    public Button createFuncDigButtons(Composite parent, GridData gridData, final String digit, final char formethod)
    {
        Button button = new Button(parent, SWT.PUSH);
          button.setLayoutData(gridData);
          button.setText(String.valueOf(digit));
          button.addSelectionListener(new SelectionListener() {
            @Override
            public void widgetSelected(SelectionEvent arg0) {
             // update(formethod);
                calcul.getDigit(formethod);
                label.setText(calcul.output);
                if (calcul.memtrue)
                {
                    label2.setText("M");
                }
                else
                {
                    label2.setText("");
                }
            }

            @Override
            public void widgetDefaultSelected(SelectionEvent arg0) {
              /* do nothing */
            }
          });
          button.addKeyListener(new KeyListener() {

            @Override
            public void keyReleased(KeyEvent arg0) {
            }

            @Override
            public void keyPressed(KeyEvent arg0) {
                calcul.getDigit(arg0.character);
                label.setText(calcul.output);
            }
        });
        return button;
    }

    public void setFocus() {
        label.setFocus();
    }
}

此外，我如何布置我的左右按钮，它们将是相同的大小？我的操作可以让我得到很好的结果，我仍然有其他尺寸的记忆按钮，然后是右按钮。这是一张图片：

enter image description here

Answer 1

在代码中使用tru来关注按钮button.setFocus（）

如何将键盘按下的符号输入到java中的标签中？

1 个答案: