Question

我想使用SWT设计一个密码对话框，我可以使用下面的代码实现这一点，但我也希望这两个字段都是强制性的，我无法理解如何在下面的代码中包含此功能。请帮帮我。

import org.eclipse.jface.dialogs.*;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class PasswordDialog extends Dialog {
    private Text txtUser;
    private Text txtPassword;
    private String user = "";
    private String password = "";

    public PasswordDialog(Shell parentShell) {
        super(parentShell);
    }

    @Override
    protected Control createDialogArea(Composite parent) {
        Composite container = (Composite) super.createDialogArea(parent);
        GridLayout layout = new GridLayout(2, false);
        layout.marginRight = 5;
        layout.marginLeft = 10;
        container.setLayout(layout);

        Label lblUser = new Label(container, SWT.NONE);
        lblUser.setText("User:");

        txtUser = new Text(container, SWT.BORDER);
        txtUser.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        txtUser.setText(user);
        txtUser.addModifyListener(new ModifyListener() {

            @Override
            public void modifyText(ModifyEvent e) {
                Text textWidget = (Text) e.getSource();
                String userText = textWidget.getText();
                user = userText;
            }
        });

        Label lblPassword = new Label(container, SWT.NONE);
        GridData gd_lblNewLabel = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
        gd_lblNewLabel.horizontalIndent = 1;
        lblPassword.setLayoutData(gd_lblNewLabel);
        lblPassword.setText("Password:");

        txtPassword = new Text(container, SWT.BORDER| SWT.PASSWORD);
        txtPassword.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
        txtPassword.setText(password);
        txtPassword.addModifyListener(new ModifyListener() {

            @Override
            public void modifyText(ModifyEvent e) {
                Text textWidget = (Text) e.getSource();
                String passwordText = textWidget.getText();
                password = passwordText;
            }
        });
        return container;
    }

    // override method to use "Login" as label for the OK button
    @Override
    protected void createButtonsForButtonBar(Composite parent) {
        createButton(parent, IDialogConstants.OK_ID, "Login", true);
        createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
    }

    @Override
    protected Point getInitialSize() {
         return new Point(450, 300);
    }

    @Override
    protected void okPressed() {
        user = txtUser.getText();
        password = txtPassword.getText();
        super.okPressed();
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

Answer 1

在modifyText侦听器中，您可以启用/禁用“确定”按钮。使用类似的东西：

void updateOKStatus(boolean enable)
{
  Button ok = getButton(IDialogConstants.OK_ID);
  if (ok != null)
    ok.setEnabled(enable);
}

如何在SWT对话中强制要求字段？

1 个答案: