所以,我在滚动 Pane 中有一堆文本字段。 当用户聚焦底部的最后一个文本字段时,会添加更多文本字段。 我的问题是,如何使滚动 Pane 滚动到聚焦的文本字段? 我的意思是,用户将按 TAB 或 ENTER 跳转到下一个文本字段,但如果不自己滚动,他将无法看到它。 当最后一个文本字段具有焦点时,我可以模拟按下向下箭头或 PageDown,但这会很丑陋,即使它会做我需要做的事情。
我通过搜索找到了类似的东西,但我无法使其工作。
public void focusGained(FocusEvent e) {
currentview = t1;
int cons = i - 1;
Rectangle r = new Rectangle(t1.getX(), t1.getY(), 1, 1);
jScrollPane1.scrollRectToVisible(r);
if (t1.getName().equals("prod" + cons)) {
newproduct();
};
}
最佳答案
出现了两件事。
首先,JTextField#scrollRectToVisible
已被覆盖,并且执行的操作与其他组件略有不同......烦人......
其次,您需要转换相对于其父级的字段位置,然后使用父级的 scrollRectToVisible
方法,例如...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Rectangle;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ScrollFocusedField {
public static void main(String[] args) {
new ScrollFocusedField();
}
public ScrollFocusedField() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
FocusAdapter fh = new FocusAdapter() {
@Override
public void focusGained(FocusEvent e) {
JComponent comp = (JComponent) e.getComponent();
System.out.println("FocusGained");
Rectangle bounds = comp.getBounds();
bounds.setLocation(SwingUtilities.convertPoint(comp, bounds.getLocation(), comp.getParent()));
JComponent parent = (JComponent) comp.getParent();
parent.scrollRectToVisible(comp.getBounds());
}
};
JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
for (int index = 0; index < 100; index++) {
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.gridx = 0;
gbc.gridy = index;
panel.add(new JLabel(Integer.toString(index)), gbc);
JTextField field = new JTextField();
field.addFocusListener(fh);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
gbc.gridx = 1;
panel.add(field, gbc);
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new JScrollPane(panel));
frame.setSize(200, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
关于java - 滚动到焦点文本字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20508840/