我有以下代码。执行以下代码后,它显示了一个包含一个 JInternalFrame 的 JFrame,它有一个 JScrollPane 这个 JScrollPane 有一个 JPanel 有很多输入控件。由于 JPanel 的大小由于许多输入控件而比 JInternalFrame 的大小更大,所以我它是可滚动的。
import java.awt.Dimension;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
public class InterfaceDesign {
public static void main(String args[]) {
InterfaceDesign id = new InterfaceDesign();
id.getPnlProjectDetail("My Project");
}
public void getPnlProjectDetail(String strProjectName) {
JPanel pnlPjDetail = new JPanel();
JScrollPane scrPjDetail;
pnlPjDetail.setLayout(null);
pnlPjDetail.setBounds(0, 0, 400, 400);
JFrame frmtest = new JFrame();
JInternalFrame interFrame = new JInternalFrame();
interFrame.setBounds(0, 0, 280, 180);
frmtest.setBounds(1, 1, 300, 200);
pnlPjDetail.setPreferredSize(new Dimension(400, 400));
JLabel lblFirstName = new JLabel("First Name");
JLabel lblLastName = new JLabel("Last Name");
JLabel lblAddress = new JLabel("Address");
JLabel lblCity = new JLabel("City");
JLabel lblZipCode = new JLabel("Zip Code");
JLabel lblPhone = new JLabel("Phone");
JLabel lblEmailID = new JLabel("Emain Id");
JTextField tfFirstName = new JTextField();
JTextField tfLastName = new JTextField();
JTextField tfAddress = new JTextField();
JTextField tfCity = new JTextField();
JTextField tfZipCode = new JTextField();
JTextField tfPhone = new JTextField();
JTextField tfEmailID = new JTextField();
lblFirstName.setBounds(25, 55, 85, 20);
tfFirstName.setBounds(25, 85, 85, 20);
pnlPjDetail.add(lblFirstName);
pnlPjDetail.add(tfFirstName);
lblLastName.setBounds(25, 115, 85, 20);
tfLastName.setBounds(25, 145, 85, 20);
pnlPjDetail.add(lblLastName);
pnlPjDetail.add(tfLastName);
lblAddress.setBounds(25, 175, 85, 20);
tfAddress.setBounds(25, 205, 85, 20);
pnlPjDetail.add(lblAddress);
pnlPjDetail.add(tfAddress);
lblCity.setBounds(25, 235, 85, 20);
tfCity.setBounds(25, 265, 85, 20);
pnlPjDetail.add(lblCity);
pnlPjDetail.add(tfCity);
lblZipCode.setBounds(25, 295, 85, 20);
tfZipCode.setBounds(25, 325, 85, 20);
pnlPjDetail.add(lblZipCode);
pnlPjDetail.add(tfZipCode);
lblPhone.setBounds(25, 355, 85, 20);
tfPhone.setBounds(25, 385, 85, 20);
pnlPjDetail.add(lblPhone);
pnlPjDetail.add(tfPhone);
lblEmailID.setBounds(25, 415, 85, 20);
tfEmailID.setBounds(25, 445, 85, 20);
pnlPjDetail.add(lblEmailID);
pnlPjDetail.add(tfEmailID);
scrPjDetail = new JScrollPane(pnlPjDetail);
scrPjDetail.setAutoscrolls(true);
//frmtest.setContentPane(scrProjectDetail);
interFrame.setContentPane(scrPjDetail);
JDesktopPane dpane = new JDesktopPane();
interFrame.setVisible(true);
dpane.add(interFrame);
//frmtest.getLayeredPane().add(interFrame);
frmtest.setContentPane(dpane);
//frmtest.add(scrProjectDetail);
frmtest.setVisible(true);
frmtest.setResizable(false);
frmtest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//return pnlPjDetail;
}
}
我需要您的指导来解决以下问题/疑问
- 当我们按下键盘上的 TAB 按钮时,光标会从一个文本框移动到另一个文本框,但 ScrollBar(此处为垂直滚动条)不会随着光标移动到下方的输入字段而自动移动 那么如何使滚动条移动当它向下或向上移动时,它本身是否与光标一起移动?
- 由于这是一个演示代码,是否可以将两个 JscrollPane 并排添加到 JInterNalFrame 中?
- 是否需要用户JDesktopPane 将JInternalFrame 添加到JFrame 中?即我们不能按如下方式添加 JInternalFrame 是真的吗
<JFrame>.getContentPane.add(<JInternalFrame>);
最佳答案
简单的任务,令人惊讶的古怪解决方案 - 就个人而言,我认为每个必须依赖焦点的应用程序代码解决方案都是古怪的;-)
无法提出任何不依赖于焦点的东西:通过不需要在表单上的每个组件上都使用 focusListener,只会稍微提高可维护性。相反,向 KeyboardFocusManager 注册一个 PropertyChangeListener 并在收到关于其 PermanentFocusOwner 属性更改的通知时进行滚动
public static class FocusDrivenScroller implements PropertyChangeListener {
private JComponent parent;
public FocusDrivenScroller(JComponent parent) {
this.parent = parent;
}
@Override
public void propertyChange(PropertyChangeEvent evt) {
Component focused = (Component) evt.getNewValue();
if (focused == null || !SwingUtilities.isDescendingFrom(focused, parent)) return;
parent.scrollRectToVisible(focused.getBounds());
}
}
要在应用程序代码中使用,请使用 JScrollPane 中的表单进行实例化
public void buildAndShowDetailsFrame(String strProjectName) {
// the container to scroll such that a focused child
// is visible when gaining focus
JPanel detailsForm = new JPanel();
KeyboardFocusManager.getCurrentKeyboardFocusManager()
.addPropertyChangeListener("permanentFocusOwner",
new FocusDrivenScroller(detailsForm));
// choose and use an appropriate LayoutManager
// note: this is only an example!
// real-world requirements most probably need a stronger one
detailsForm.setLayout(new BoxLayout(detailsForm, BoxLayout.PAGE_AXIS));
// quick fill with stuff
String[] labels = {"First Name", "Last Name",
"Address", "City", "Zip Code", "Phone", "Emain Id"};
for (String string : labels) {
detailsForm.add(new JLabel(string));
detailsForm.add(new JTextField());
}
JFrame frame = new JFrame();
frame.add(new JScrollPane(detailsForm));
frame.pack();
// force scrollbar to appear
frame.setSize(frame.getWidth(), frame.getHeight()/2);
frame.setVisible(true);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
除了这个方法的第一行之外,它只是 OP 代码的缩短版本(用来引诱他/她使用适当的 LayoutManager :-)
关于java - 当我们按下键盘上的 TAB 按钮时,如何使滚动 Pane 的滚动条随光标自动移动?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7227441/