我正在嘗試創建一個帶有滾動條的容器，并且容器內部有兩個內部面板。頂部內面板內還有另一個 JScrollPane。但目前我面臨的問題是，當我的頂部內面板太長（寬度）時，頂部內面板內的滾動條被禁用，我只能滾動容器的滾動條。import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollPane;public class TestFrame { public static void main(String... args) { JFrame frame = new JFrame(); JPanel panel = new JPanel(); for (int i = 0; i < 10; i++) { panel.add(new JButton("Hello-" + i)); } JScrollPane scrollPane = new JScrollPane(panel); scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER); JPanel contentPane = new JPanel(new BorderLayout()); JPanel contentPaneSub = new JPanel(); contentPaneSub.add(scrollPane); contentPane.add(contentPaneSub, BorderLayout.NORTH); JPanel centerPanel = new JPanel(new FlowLayout()); centerPanel.add(new JButton("Example")); contentPane.add(centerPanel, BorderLayout.CENTER); JScrollPane scrollPane1 = new JScrollPane(contentPane); scrollPane1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); scrollPane1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER); frame.setContentPane(scrollPane1); //for demo purpose we set this using hard coded way //in real life project the java will auto adjust it size based on windows resolution frame.setSize(new Dimension(500, 160)); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.setVisible(true); }}我希望得到的是，如果頂部內面板的寬度太長，那么頂部內面板內的滾動條將可見并允許滾動。不是容器中的滾動條。
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TA貢獻1775條經驗 獲得超8個贊
我在嘗試解決這個問題時遇到了兩個不同的問題。第一個是將JScrollPane包含在窗口內，第二個是JScrollPane動態調整 的大小。
我能夠解決第一個問題，但無法使用自定義類完全解決第二個問題。隨著窗口的增加動態JScrollPane增加其寬度，但不會隨著窗口大小動態縮小。這是因為當窗口尺寸減小時，outerJScrollPane會鎖定內部內容的寬度，包括inner JScrollPane。
我無法找到一種方法讓內部窗格動態收縮，而無需有效刪除外部窗格的功能，這是行不通的，因為您的問題是專門針對另一個功能內JScrollPane的JScrollPane。
public class TestFrame {
public static void main(String... args) {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
for (int i = 0; i < 10; i++) {
panel.add(new JButton("Hello-" + i));
}
MyCustomPane scrollPane = new MyCustomPane(panel); //changed this line
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
JPanel contentPane = new JPanel(new BorderLayout());
JPanel contentPaneSub = new JPanel();
contentPaneSub.add(scrollPane);
scrollPane.setOuterContainer(contentPaneSub); //added this line
contentPane.add(contentPaneSub, BorderLayout.NORTH);
JPanel centerPanel = new JPanel(new FlowLayout());
centerPanel.add(new JButton("Example"));
contentPane.add(centerPanel, BorderLayout.CENTER);
JScrollPane scrollPane1 = new JScrollPane(contentPane);
scrollPane1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);
frame.setContentPane(scrollPane1);
//for demo purpose we set this using hard coded way
//in real life project the java will auto adjust it size based on windows resolution
frame.setSize(new Dimension(500, 160));
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setVisible(true);
}
}
MyCustomPane 類的代碼：
public class MyCustomPane extends JScrollPane {
Container outerContainer;
public MyCustomPane(Component view) {
super(view);
}
public void setOuterContainer(Container outerContainer) {
this.outerContainer = outerContainer;
}
private Dimension getCustomDimensions() {
if (outerContainer == null) {
return new Dimension(0, 0);
}
return new Dimension(outerContainer.getWidth() - 10, 60); //10 pixels less than container width, arbitrary height
}
@Override
public Dimension getMaximumSize() {
return getCustomDimensions();
}
@Override
public Dimension getMinimumSize() {
return getCustomDimensions();
}
@Override
public Dimension getPreferredSize() {
return getCustomDimensions();
}
}
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