Java 如何在JScrollPane上向下滚动垂直滚动条?
我在Java/Swing中使用Netbeans,但我的滚动窗格有问题。 首先,我的滚动面板中有两个Java 如何在JScrollPane上向下滚动垂直滚动条?,java,swing,netbeans,jscrollpane,jscrollbar,Java,Swing,Netbeans,Jscrollpane,Jscrollbar,我在Java/Swing中使用Netbeans,但我的滚动窗格有问题。 首先,我的滚动面板中有两个JPanel组件。当我初始化所有组件时,我使第二个面板不可见。我希望当我点击一个按钮时,第二个面板设置可见(它工作),垂直滚动条向下移动以显示第二个面板 我在单击按钮时使用此代码: public void eventoAdd() { miVista.getJpanelSegundo().setVisible(true); miVista.getJScrollPane1().g
JPanel
组件。当我初始化所有组件时,我使第二个面板不可见。我希望当我点击一个按钮时,第二个面板设置可见(它工作),垂直滚动条向下移动以显示第二个面板
我在单击按钮时使用此代码:
public void eventoAdd() {
miVista.getJpanelSegundo().setVisible(true);
miVista.getJScrollPane1().getVerticalScrollBar().setValue(280);
}
垂直滚动条在第一次单击时不会进入底部,但在第二次尝试时,垂直滚动条似乎会进入底部。有什么问题
附言:我看到很多问题,但对于这个具体的问题没有答案
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author rober
*/
public class View extends javax.swing.JFrame {
/**
* Creates new form View
*/
public View() {
initComponents();
jPanelSecond.setVisible(false);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPaneFirst = new javax.swing.JScrollPane();
jPanelMain = new javax.swing.JPanel();
jPanelFirst = new javax.swing.JPanel();
jPanelSecond = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jScrollPaneFirst.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
jPanelFirst.setBorder(javax.swing.BorderFactory.createTitledBorder("First"));
javax.swing.GroupLayout jPanelFirstLayout = new javax.swing.GroupLayout(jPanelFirst);
jPanelFirst.setLayout(jPanelFirstLayout);
jPanelFirstLayout.setHorizontalGroup(
jPanelFirstLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jPanelFirstLayout.setVerticalGroup(
jPanelFirstLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 61, Short.MAX_VALUE)
);
jPanelSecond.setBorder(javax.swing.BorderFactory.createTitledBorder("Second"));
javax.swing.GroupLayout jPanelSecondLayout = new javax.swing.GroupLayout(jPanelSecond);
jPanelSecond.setLayout(jPanelSecondLayout);
jPanelSecondLayout.setHorizontalGroup(
jPanelSecondLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 294, Short.MAX_VALUE)
);
jPanelSecondLayout.setVerticalGroup(
jPanelSecondLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 63, Short.MAX_VALUE)
);
javax.swing.GroupLayout jPanelMainLayout = new javax.swing.GroupLayout(jPanelMain);
jPanelMain.setLayout(jPanelMainLayout);
jPanelMainLayout.setHorizontalGroup(
jPanelMainLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanelFirst, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanelSecond, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
jPanelMainLayout.setVerticalGroup(
jPanelMainLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanelMainLayout.createSequentialGroup()
.addComponent(jPanelFirst, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jPanelSecond, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
jScrollPaneFirst.setViewportView(jPanelMain);
jButton1.setText("Add");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPaneFirst, javax.swing.GroupLayout.PREFERRED_SIZE, 280, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(98, 98, 98)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPaneFirst, javax.swing.GroupLayout.PREFERRED_SIZE, 113, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jPanelSecond.setVisible(true);
jScrollPaneFirst.getVerticalScrollBar().setValue(280);
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new View().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JPanel jPanelFirst;
private javax.swing.JPanel jPanelMain;
private javax.swing.JPanel jPanelSecond;
private javax.swing.JScrollPane jScrollPaneFirst;
// End of variables declaration
}
/*
*要更改此许可证标题,请在“项目属性”中选择“许可证标题”。
*要更改此模板文件,请选择工具|模板
*然后在编辑器中打开模板。
*/
/**
*
*@作者罗伯
*/
公共类视图扩展了javax.swing.JFrame{
/**
*创建新的表单视图
*/
公众观点(){
初始化组件();
jPanelSecond.setVisible(假);
}
/**
*从构造函数中调用此方法来初始化表单。
*警告:不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告(“未选中”)
//
私有组件(){
jScrollPaneFirst=newjavax.swing.JScrollPane();
jPanelMain=newjavax.swing.JPanel();
jPanelFirst=newjavax.swing.JPanel();
jPanelSecond=newjavax.swing.JPanel();
jButton1=newjavax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jScrollPaneFirst.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HorizontalScrollBar\uNever);
setboorder(javax.swing.BorderFactory.createTitledBorder(“第一”));
javax.swing.GroupLayout jPanelFirstLayout=newjavax.swing.GroupLayout(jPanelFirst);
jPanelFirst.setLayout(jPanelFirstLayout);
jPanelFirstLayout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,0,短.MAX_值)
);
jPanelFirstLayout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,61,短的最大值)
);
jPanelSecond.setboorder(javax.swing.BorderFactory.createTitledBorder(“第二”);
javax.swing.GroupLayout jPanelSecondLayout=新的javax.swing.GroupLayout(jPanelSecond);
jPanelSecond.setLayout(jPanelSecondLayout);
jPanelSecondLayout.setHorizontalGroup(
jPanelSecondLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,294,短。最大值)
);
jPanelSecondLayout.setVerticalGroup(
jPanelSecondLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,63,短的最大值)
);
javax.swing.GroupLayout jpanelmainloayout=新的javax.swing.GroupLayout(jPanelMain);
jPanelMain.setLayout(jpanelmainloayout);
jPanelMainLayout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanelFirst、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、Short.MAX\u值)
.addComponent(jPanelSecond、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、Short.MAX\u值)
);
jPanelMainLayout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanelMainLayout.createSequentialGroup()
.addComponent(jPanelFirst、javax.swing.GroupLayout.PREFERRED\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.PREFERRED\u SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED,javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u值)
.addComponent(jPanelSecond、javax.swing.GroupLayout.PREFERRED\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.PREFERRED\u SIZE)
.addContainerGap())
);
jScrollPaneFirst.setViewportView(jPanelMain);
jButton1.setText(“添加”);
jButton1.addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPaneFirst,javax.swing.GroupLayout.PREFERRED\u SIZE,280,javax.swing.GroupLayout.PREFERRED\u SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(98,98,98)
.addComponent(jButton1,javax.swing.GroupLayout.PREFERRED_SIZE,58,javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u VALUE))
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPaneFirst,javax.swing.GroupLayout.PREFERRED\u SIZE,113,javax.swing.GroupLayout.PREFERRED\u SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED,javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u值)
.addComponent(jButton1))
);
包装();
}//
私有void jButton1ActionPerformed(java.awt.event.ActionEvent evt){
jPanelSecond.setVisible(真);
jScrollPane
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
jPanelSecond.setVisible(true);
Rectangle viewBounds = jScrollPaneFirst.getViewportBorderBounds();
Dimension size = jPanelMain.getPreferredSize();
jPanelMain.scrollRectToVisible(new Rectangle(0, size.height, viewBounds.width, viewBounds.height));
//jScrollPaneFirst.getVerticalScrollBar().setValue(280);
}