RCP之病人信息系统开发总结（10）：MVC模式之View层—首选项

在菜单栏中Window选项中添加了首选项Preference，它是用于设置程序中的一些配置项的地方

演示：修改用户登录信息的配置项，选中“show password”可以查看密码

   

 

完整的一个首选项的开发过程：

1.添加Extension，配置如下：

 

 

2.编写对应的class

 

package com.yinger.patientims.preferencePages; 

import org.eclipse.jface.preference.PreferencePage;

public class LoginPreferencePage extends PreferencePage implements IWorkbenchPreferencePage, ModifyListener {
  private Text text_name;
  private Text text_pwd;
  private Text text_pwd2;
  private Button btnShowPassword;

  public LoginPreferencePage() {
    setDescription("You can modify your login information here!");// 设置首选页的提示信息
  }

  @Override
  public void modifyText(ModifyEvent e) {
    String name = text_name.getText();
    String pwd = text_pwd.getText();

    // 下面是我能做到的最好的提示方式，虽然还是有些bug在里面，比如：
    // 如果填写了name之后又删掉了，那么那个错误提示一直会存在，即使又填写了name
    if (e.widget.equals(text_name)) {
      if (name == null || name.equals("")) {
        setErrorMessage("UserName can not be null!");
      }
    } else if (e.widget.equals(text_pwd)) {
      if (pwd == null || pwd.equals("")) {
        setErrorMessage("Password can not be null!");
      } else {
        if (btnShowPassword.getSelection()) {
          text_pwd2.setText(text_pwd.getText());
        }
      }
    }
    if (name != null && !name.equals("") && pwd != null && !pwd.equals("")) {
      setMessage("Login information has been changed!");
      setValid(true);
    } else {
      setMessage("Login information is not valid!");
      setValid(false);
    }

    //原书的写法
    // if (name==null || name.equals("")) {
    // setErrorMessage("UserName can not be null!");
    // setValid(false);
    // }else if (pwd==null || pwd.equals("")) {
    // setErrorMessage("Password can not be null!");//这里会有问题！
    // setValid(false);
    // }else {
    // // setErrorMessage("");
    // setMessage("Login information has been changed!");
    // setValid(true);
    // }

  }

  @Override
  public void init(IWorkbench workbench) {

  }

  @Override
  protected Control createContents(Composite parent) {
    Composite composite = new Composite(parent, SWT.NONE);
    // composite.setLayout(new GridLayout(1, false));
    composite.setLayout(new FillLayout());
    Group group = new Group(composite, SWT.NONE);
    group.setText("Login information");
    group.setLayout(new GridLayout(2, false));

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

    text_name = new Text(group, SWT.BORDER);
    text_name.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
    text_name.addModifyListener(this);
    // text_name.setText("yinger");//这里我也不知道如果可以赋初值，这句话会报错！

    Label lblPassword = new Label(group, SWT.NONE);
    lblPassword.setText("Password:");

    text_pwd = new Text(group, SWT.BORDER);
    text_pwd.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
    text_pwd.addModifyListener(this);
    // text_pwd.setText("090807");
    text_pwd.setEchoChar('*');// 密码不显示

    btnShowPassword = new Button(group, SWT.CHECK);
    btnShowPassword.setText("show Password");

    text_pwd2 = new Text(group, SWT.BORDER);
    text_pwd2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
    text_pwd2.setEditable(false);

    btnShowPassword.addSelectionListener(new SelectionListener() {
      @Override
      public void widgetSelected(SelectionEvent e) {
        if (btnShowPassword.getSelection()) {
          text_pwd2.setText(text_pwd.getText());
        } else {
          // text_pwd2.setEchoChar('*');
          text_pwd2.setText("");
        }
      }

      @Override
      public void widgetDefaultSelected(SelectionEvent e) {

      }
    });
    noDefaultAndApplyButton();// 隐藏“Restore Default”和“Apply”按钮
    setValid(false);
    return composite;
  }

  @Override
  public boolean performOk() {
    //添加相应的修改登录信息的内容！
    return true;
  }

}

 

3.运行，点击“window”，点击“Preference”即可查看到

之前已经在ApplicationActionBarAdvisor类中设置好了

 

    // 定义打开“首选项”操作 
    preferenceAction = ActionFactory.PREFERENCES.create(window);
//    preferenceAction.setImageDescriptor(PlatformUI.getWorkbench().getSharedImages().getImageDescriptor(ISharedImages.IMG_ETOOL_HOME_NAV));
    preferenceAction.setImageDescriptor(Activator.getImageDescriptor("/icons/Home.ico"));
    register(preferenceAction);

 

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