JPanels在同一窗口中加载信息
我在JPanel中有两个JFrame个组件。第一个面板（firstP）包含一个JList，它从新闻服务器加载邮件头。在第二个面板（secondP）中，我想加载消息的正文。
当我从列表中选择一个项目时，它会打开一个新闻面板，其中加载了消息正文（这是它现在的工作方式），但我不喜欢这样。
我想在secondP中选择firstP中的标题（在同一帧中）时加载正文消息。
现在如何运作：
我想如何工作：
以下是两个面板的代码
public GroupViewer(NewsGroupList groupl, NewsGroup group)
{
super(group.name());
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
{
Close();
}
});
JMenu M1;
JMenuBar Bar;
GroupList=groupl;
this.group=group;
JPanel container = new JPanel();
JPanel mainP=new JPanel();
JPanel secondPanel= new JPanel();
container.setLayout(new GridLayout(1,2));
GridBagLayout grid=new GridBagLayout();
GridBagConstraints c=new GridBagConstraints();
secondPanel.setLayout(grid);
c.weightx=0;
c.weighty=0;
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl=new JLabel("Subject :");
grid.setConstraints(lbl, c);
secondPanel.add(lbl);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
Subject=new JTextField("");
grid.setConstraints(Subject, c);
secondPanel.add(Subject);
if (Type==VIEW)
Subject.setEditable(false);
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl1=new JLabel("Newsgroups :");
grid.setConstraints(lbl1, c);
secondPanel.add(lbl1);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
if (((Type&NEWS)!=0)||((Type&VIEW)!=0))
NewsGroups=new JTextField(group.name());
else
NewsGroups=new JTextField("");
if (Type==VIEW)
NewsGroups.setEditable(false);
grid.setConstraints(NewsGroups, c);
secondPanel.add(NewsGroups);
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl2=new JLabel("To :");
grid.setConstraints(lbl2, c);
secondPanel.add(lbl2);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
To=new JTextField("");
grid.setConstraints(To, c);
secondPanel.add(To);
if (Type==VIEW)
To.setEditable(false);
if (Type==VIEW)
{
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl3=new JLabel("Date :");
grid.setConstraints(lbl3, c);
secondPanel.add(lbl3);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
Date=new JTextField(formatDate(ref.getDate()));
Date.setEditable(false);
grid.setConstraints(Date, c);
secondPanel.add(Date);
}
c.weightx=1;
c.weighty=1;
c.gridwidth=GridBagConstraints.REMAINDER;
c.fill=GridBagConstraints.BOTH;
Body=new JTextArea("", 40, 80);
grid.setConstraints(Body, c);
secondPanel.add(Body);
c.weightx = 1;
c.weighty = 1;
c.fill = GridBagConstraints.BOTH;
JScrollPane scrollPane = new JScrollPane(Body);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
grid.setConstraints(scrollPane, c);
secondPanel.add(scrollPane);
if (Type==VIEW)
Body.setEditable(false);
if (((Type&REPLY)!=0)||((Type&VIEW)!=0))
{
if ((Type&REPLY)!=0)
{
int pos=-1, pos1;
boolean last=false;
String OrigBody;
try
{
OrigBody=RefArticle.getBody(Group.getServer());
do
{
pos1=OrigBody.indexOf('\n', pos+1);
if (pos1==-1)
{
last=true;
pos1=OrigBody.length()-1;
}
Body.append(">"+OrigBody.substring(pos+1, pos1+1));
pos=pos1;
}
while (!last);
}
catch (Exception ex)
{
System.out.println("Unable to get body for this article\n"+ ex.getMessage());
}
}
else
{
try
{
Body.setText(RefArticle.getBody(Group.getServer()));
}
catch (Exception ex)
{
System.out.println("Unable to get body for this article\n"+ ex.getMessage());
}
}
String subject=RefArticle.getHeaderField("Subject");
if (subject.toLowerCase().startsWith("re: ")||((Type&VIEW)!=0))
Subject.setText(subject);
else
Subject.setText("Re: "+subject);
if (((Type)!=0)||((Type&VIEW)!=0))
To.setText(RefArticle.getHeaderField("From"));
}
attachments=new JPanel();
attachments.add("Center", new JLabel("No attachments yet ."));
split=new JSplitPane(JSplitPane.VERTICAL_SPLIT, true, secondPanel, attachments);
split.setOneTouchExpandable(true);
getContentPane().add(split);
if (Type==VIEW)
{
HViewer=new HeaderViewer(RefArticle.getHeaderField("Message-ID"));
HViewer.setArticle(RefArticle);
}
split.setDividerLocation(0.9);
listModel=new DefaultListModel();
lst=new JList(listModel);
JScrollPane scroller=new JScrollPane(lst);
lst.addListSelectionListener(this);
mainP.add("Center", scroller);
Bar=new JMenuBar();
M1=new JMenu("Group");
I_Refresh=new JMenuItem("View");
I_Refresh.addActionListener(this);
M1.add(I_Refresh);
JMenuItem jmi;
M1.addSeparator();
M1.add(jmi=new JMenuItem("Close"));
jmi.addActionListener(this);
Bar.add(M1);
Bar.add(M1);
setJMenuBar(Bar);
getContentPane().add("Center", container);
container.add(mainP);
container.add(secondPanel);
pack();
show();
}
这里是我从列表中选择项目时用来读取消息正文的方法。问题是它打开了一个包含信息的新窗口，我不想要一个新窗口。
我不知道如何修改Article Composer构造函数以不打开新窗口。 （我想要一个类似于Mozilla Thunderbird的GUI，在JFrame的左侧部分选择消息的标题，它打开正文以便在框架的右侧读取而不打开新窗口）
public void valueChanged(ListSelectionEvent e)
{
int index=((JList)e.getSource()).getSelectedIndex();
if (index != -1)
{
CurrentArticle=(NewsArticle)lst.getSelectedValue();
group.setArticleRead(CurrentArticle);
if (CurrentArticle != null)
{
if (viewer==null)
{
***secondPanel.add(new ArticleComposer(GroupList, group, CurrentArticle, ArticleComposer.VIEW));***
}
else
{
viewer.setArticle(CurrentArticle);
if (viewer.isShowing()==false)
viewer.show();
}
}
}
else
{
CurrentArticle=null;
if (viewer!=null)
viewer.clearText();
}
}
1 个答案:
答案 0 :(得分：0)
以下是两个JPanels的代码
public GroupViewer(NewsGroupList groupl, NewsGroup group)
{
super(group.name());
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
{
Close();
}
});
JMenu M1;
JMenuBar Bar;
GroupList=groupl;
this.group=group;
JPanel container = new JPanel();
JPanel mainP=new JPanel();
JPanel secondPanel= new JPanel();
container.setLayout(new GridLayout(1,2));
GridBagLayout grid=new GridBagLayout();
GridBagConstraints c=new GridBagConstraints();
secondPanel.setLayout(grid);
c.weightx=0;
c.weighty=0;
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl=new JLabel("Subject :");
grid.setConstraints(lbl, c);
secondPanel.add(lbl);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
Subject=new JTextField("");
grid.setConstraints(Subject, c);
secondPanel.add(Subject);
if (Type==VIEW)
Subject.setEditable(false);
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl1=new JLabel("Newsgroups :");
grid.setConstraints(lbl1, c);
secondPanel.add(lbl1);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
if (((Type&NEWS)!=0)||((Type&VIEW)!=0))
NewsGroups=new JTextField(group.name());
else
NewsGroups=new JTextField("");
if (Type==VIEW)
NewsGroups.setEditable(false);
grid.setConstraints(NewsGroups, c);
secondPanel.add(NewsGroups);
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl2=new JLabel("To :");
grid.setConstraints(lbl2, c);
secondPanel.add(lbl2);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
To=new JTextField("");
grid.setConstraints(To, c);
secondPanel.add(To);
if (Type==VIEW)
To.setEditable(false);
if (Type==VIEW)
{
c.gridwidth=1;
c.anchor=GridBagConstraints.EAST;
c.fill=GridBagConstraints.NONE;
JLabel lbl3=new JLabel("Date :");
grid.setConstraints(lbl3, c);
secondPanel.add(lbl3);
c.gridwidth=GridBagConstraints.REMAINDER;
c.anchor=GridBagConstraints.WEST;
c.fill=GridBagConstraints.HORIZONTAL;
Date=new JTextField(formatDate(ref.getDate()));
Date.setEditable(false);
grid.setConstraints(Date, c);
secondPanel.add(Date);
}
c.weightx=1;
c.weighty=1;
c.gridwidth=GridBagConstraints.REMAINDER;
c.fill=GridBagConstraints.BOTH;
Body=new JTextArea("", 40, 80);
grid.setConstraints(Body, c);
secondPanel.add(Body);
c.weightx = 1;
c.weighty = 1;
c.fill = GridBagConstraints.BOTH;
JScrollPane scrollPane = new JScrollPane(Body);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
grid.setConstraints(scrollPane, c);
secondPanel.add(scrollPane);
if (Type==VIEW)
Body.setEditable(false);
if (((Type&REPLY)!=0)||((Type&VIEW)!=0))
{
if ((Type&REPLY)!=0)
{
int pos=-1, pos1;
boolean last=false;
String OrigBody;
try
{
OrigBody=RefArticle.getBody(Group.getServer());
do
{
pos1=OrigBody.indexOf('\n', pos+1);
if (pos1==-1)
{
last=true;
pos1=OrigBody.length()-1;
}
Body.append(">"+OrigBody.substring(pos+1, pos1+1));
pos=pos1;
}
while (!last);
}
catch (Exception ex)
{
System.out.println("Unable to get body for this article\n"+ ex.getMessage());
}
}
else
{
try
{
Body.setText(RefArticle.getBody(Group.getServer()));
}
catch (Exception ex)
{
System.out.println("Unable to get body for this article\n"+ ex.getMessage());
}
}
String subject=RefArticle.getHeaderField("Subject");
if (subject.toLowerCase().startsWith("re: ")||((Type&VIEW)!=0))
Subject.setText(subject);
else
Subject.setText("Re: "+subject);
if (((Type)!=0)||((Type&VIEW)!=0))
To.setText(RefArticle.getHeaderField("From"));
}
attachments=new JPanel();
attachments.add("Center", new JLabel("No attachments yet ."));
split=new JSplitPane(JSplitPane.VERTICAL_SPLIT, true, secondPanel, attachments);
split.setOneTouchExpandable(true);
getContentPane().add(split);
if (Type==VIEW)
{
HViewer=new HeaderViewer(RefArticle.getHeaderField("Message-ID"));
HViewer.setArticle(RefArticle);
}
split.setDividerLocation(0.9);
listModel=new DefaultListModel();
lst=new JList(listModel);
JScrollPane scroller=new JScrollPane(lst);
lst.addListSelectionListener(this);
mainP.add("Center", scroller);
Bar=new JMenuBar();
M1=new JMenu("Group");
I_Refresh=new JMenuItem("View");
I_Refresh.addActionListener(this);
M1.add(I_Refresh);
JMenuItem jmi;
M1.addSeparator();
M1.add(jmi=new JMenuItem("Close"));
jmi.addActionListener(this);
Bar.add(M1);
Bar.add(M1);
setJMenuBar(Bar);
getContentPane().add("Center", container);
container.add(mainP);
container.add(secondPanel);
pack();
show();
}
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