Java Swing-确保文本组件中的行可见
我有一些文本组件(特别是它Java Swing-确保文本组件中的行可见,java,swing,jscrollpane,viewport,jeditorpane,Java,Swing,Jscrollpane,Viewport,Jeditorpane,我有一些文本组件(特别是它JEditorPane),需要作为对某些事件的响应,使文本组件中的某些行可见-如有必要,滚动到它。如何使用Swing进行此操作 我发现setCaretPosition,但它并不总是好的。若插入符号已经位于为其设置的新位置,它将不会使其再次可见。从教程中,您可以得到“确定可见矩形” 例如: import java.awt.*; import javax.swing.*; import javax.swing.event.*; public class IsRectVis
JEditorPane
),需要作为对某些事件的响应,使文本组件中的某些行可见-如有必要,滚动到它。如何使用Swing进行此操作
我发现setCaretPosition
,但它并不总是好的。若插入符号已经位于为其设置的新位置,它将不会使其再次可见。从教程中,您可以得到“确定可见矩形”
例如:
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class IsRectVisible {
private static void createAndShowUI() {
JFrame frame = new JFrame("IsRectVisible");
frame.getContentPane().add(new IsRectVisibleGui());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowUI();
}
});
}
private IsRectVisible() {
}
}
class IsRectVisibleGui extends JPanel {
public static final Rectangle RECT = new Rectangle(450, 400, 100, 100);
public static final Dimension INNER_PANEL_SIZE = new Dimension(600, 800);
private static final Dimension SCROLLPANE_SIZE = new Dimension(250, 300);
private static final String NOT_VISIBLE = "Not Visible";
private static final String VISIBLE = "Visible";
private static final long serialVersionUID = 1L;
private InnerPanel innerPanel = new InnerPanel();
private JViewport viewport = new JViewport();
private JLabel statusLabel = new JLabel(NOT_VISIBLE);
IsRectVisibleGui() {
JScrollPane scrollpane = new JScrollPane();
scrollpane.setViewport(viewport);
viewport.add(innerPanel);
scrollpane.setPreferredSize(SCROLLPANE_SIZE);
viewport.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
Rectangle viewRect = viewport.getViewRect();
if (viewRect.intersects(RECT)) {
statusLabel.setText(VISIBLE);
} else {
statusLabel.setText(NOT_VISIBLE);
}
}
});
setLayout(new BorderLayout());
add(scrollpane, BorderLayout.CENTER);
add(statusLabel, BorderLayout.SOUTH);
}
class InnerPanel extends JPanel {
private static final long serialVersionUID = 1L;
InnerPanel() {
setPreferredSize(INNER_PANEL_SIZE);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.red);
g2.setStroke(new BasicStroke(4));
g2.draw(RECT);
}
}
}
您可以使用教程中的移动它,您可以得到一个确定可见矩形
例如:
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
public class IsRectVisible {
private static void createAndShowUI() {
JFrame frame = new JFrame("IsRectVisible");
frame.getContentPane().add(new IsRectVisibleGui());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
createAndShowUI();
}
});
}
private IsRectVisible() {
}
}
class IsRectVisibleGui extends JPanel {
public static final Rectangle RECT = new Rectangle(450, 400, 100, 100);
public static final Dimension INNER_PANEL_SIZE = new Dimension(600, 800);
private static final Dimension SCROLLPANE_SIZE = new Dimension(250, 300);
private static final String NOT_VISIBLE = "Not Visible";
private static final String VISIBLE = "Visible";
private static final long serialVersionUID = 1L;
private InnerPanel innerPanel = new InnerPanel();
private JViewport viewport = new JViewport();
private JLabel statusLabel = new JLabel(NOT_VISIBLE);
IsRectVisibleGui() {
JScrollPane scrollpane = new JScrollPane();
scrollpane.setViewport(viewport);
viewport.add(innerPanel);
scrollpane.setPreferredSize(SCROLLPANE_SIZE);
viewport.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
Rectangle viewRect = viewport.getViewRect();
if (viewRect.intersects(RECT)) {
statusLabel.setText(VISIBLE);
} else {
statusLabel.setText(NOT_VISIBLE);
}
}
});
setLayout(new BorderLayout());
add(scrollpane, BorderLayout.CENTER);
add(statusLabel, BorderLayout.SOUTH);
}
class InnerPanel extends JPanel {
private static final long serialVersionUID = 1L;
InnerPanel() {
setPreferredSize(INNER_PANEL_SIZE);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.red);
g2.setStroke(new BasicStroke(4));
g2.draw(RECT);
}
}
}
您可以通过使用useModelToView()方法传递偏移量并获取矩形来进行移动。然后使用scrollRectToVisible使用modelToView()方法传递偏移量并获取矩形。然后使用scrollRectToVisibleStanislavL与往常一样完全正确:)。 你必须把你想去的职位存起来。 比你得到你所需要的更多
Rectangle ractYouNeed = thePane.getUI().modelToView(thePane, position);
之后,您可以轻松地滚动到该矩形或其他任何形状。StanislavL与往常一样完全正确:)。 你必须把你想去的职位存起来。 比你得到你所需要的更多
Rectangle ractYouNeed = thePane.getUI().modelToView(thePane, position);
在那之后,你可以很容易地滚动到那个矩形或任何东西