[英]JScrollPane don't appear on JTextArea
我有下一个问题,JScrollPane 没有出现在 JTextArea 上,我不知道为什么? 我尝试了很多方法但没有任何效果,它不想显示给我! 我把代码的一部分放在下面。 一切都正确显示,JFame、JTextArea、JTextArea 内的文本,都没有 JScrollPane。 拜托,有人可以帮我吗?
package pachet;
import java.awt.BorderLayout;
import java.awt.Container;
import java.util.ArrayList;
import javax.swing.GroupLayout;
import static javax.swing.GroupLayout.Alignment.BASELINE;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import static javax.swing.LayoutStyle.ComponentPlacement.RELATED;
public class Design {
private final JFrame x;
private final JPanel panou_rezultate=new JPanel();
private final JLabel aziL=new JLabel("Azi");
private final JLabel saptamanaL=new JLabel("Ultimile 7 zile");
private final JLabel lunaL=new JLabel("Ultimile 30 zile");
private final JLabel totalL=new JLabel("De la inceput");
private final JTextArea aziArea=new JTextArea(30,60);
private final JTextArea saptamanaArea=new JTextArea(30,60);
private final JTextArea lunaArea=new JTextArea(30,60);
private final JTextArea totalArea=new JTextArea(30,60);
private final JScrollPane totalScrol=new JScrollPane(totalArea,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); //here it is created scroll
public Design(JFrame x) {
this.x = x;
functie();
}
private void functie(){
x.add(panou_rezultate,BorderLayout.CENTER);
panou_rezultate.setLayout(metoda());
panou_rezultate.add(totalScrol); //here is added scroll to panel
PrelucrareDate y=new PrelucrareDate();
aziArea.setText(y.getAziP());
String abc="";
for(int i=0; i<1000; i++){
abc=abc+"she is beautiful\n";
}
totalArea.setText(abc); //totalArea text area is filled by many sentences, so scroll must appear
}
public GroupLayout metoda(){
GroupLayout gl= new GroupLayout(panou_rezultate);
panou_rezultate.setLayout(gl);
gl.setAutoCreateGaps(true);
gl.setAutoCreateContainerGaps(true);
GroupLayout.SequentialGroup sg=gl.createSequentialGroup();
sg.addGroup(gl.createParallelGroup(GroupLayout.Alignment.CENTER) //de schimbat
.addComponent(aziL)
.addComponent(aziArea)
);
sg.addPreferredGap(RELATED,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE);
sg.addGroup(gl.createParallelGroup(GroupLayout.Alignment.CENTER) //de schimbat
.addComponent(saptamanaL)
.addComponent(saptamanaArea)
);
sg.addPreferredGap(RELATED,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE);
sg.addGroup(gl.createParallelGroup(GroupLayout.Alignment.CENTER) //de schimbat
.addComponent(lunaL)
.addComponent(lunaArea)
);
sg.addPreferredGap(RELATED,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE);
sg.addGroup(gl.createParallelGroup(GroupLayout.Alignment.CENTER) //de schimbat
.addComponent(totalL)
.addComponent(totalArea)
);
sg.addPreferredGap(RELATED,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE);
gl.setHorizontalGroup(sg);
GroupLayout.ParallelGroup pg_etichete=gl.createParallelGroup(BASELINE);
GroupLayout.ParallelGroup pg_arii_text=gl.createParallelGroup();
pg_etichete.addComponent(aziL);
pg_etichete.addComponent(saptamanaL);
pg_etichete.addComponent(lunaL);
pg_etichete.addComponent(totalL);
pg_arii_text.addComponent(aziArea);
pg_arii_text.addComponent(saptamanaArea);
pg_arii_text.addComponent(lunaArea);
pg_arii_text.addComponent(totalArea);
GroupLayout.SequentialGroup sgv=gl.createSequentialGroup(); //secvential grup pe verticala
sgv.addPreferredGap(RELATED,
GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE);
sgv.addGroup(pg_etichete);
sgv.addGroup(pg_arii_text);
sgv.addPreferredGap(RELATED,25,25);
gl.setVerticalGroup(sgv);
return gl;
}
}
我提前谢谢你!
panou_rezultate.setLayout(metoda());
panou_rezultate.add(totalScrol); //here is added scroll to panel
查看使用GroupLayout
时 IDE 生成的所有代码。
有各种复杂的代码来指定GroupLayout
使用的约束,然后使用addComponent(...)
方法。 由于这种复杂性, GroupLayout
通常仅由 IDE 生成的代码使用。
您不能简单地使用 add(...) 方法将组件添加到组布局。
我们的建议是不要使用 IDE 来生成您的布局代码。 然后你就完全控制了。
阅读有关布局管理器的 Swing 教程,了解工作示例以帮助您入门。
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