我有一个 JScrollPane 和一个 JPanel,它实现了 Scrollable 作为它的视口视图。当我将 ScrollableTracksViewportHeight 和 ScrollableTracksViewportWidth 设置为 false 时,我的面板将保持其首选大小。好的。问题是我不知道谁拥有可滚动面板周围的空间。我觉得我已经尝试过更改每个组件和对话框的背景,但似乎没有任何效果。如何将丑陋的灰色变成霓虹黄这样有趣的颜色?
这是我正在谈论的屏幕截图:
这就是我想要的:
这是复制第一张图片的代码:
package components;
import java.awt.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class DialogWithScrollPane extends JFrame {
ScrollablePanel scrollablePanel;
public DialogWithScrollPane() {
super();
setResizable(true);
Container pane = getContentPane();
scrollablePanel = new ScrollablePanel();
final JScrollPane scrollPane = new JScrollPane();
scrollPane.setPreferredSize(new Dimension(300,300));
scrollPane.setViewportView(scrollablePanel);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
pane.add(scrollPane);
setMinimumSize(new Dimension(300, 300));
setVisible(true);
}
class ScrollablePanel extends JPanel implements Scrollable {
public ScrollablePanel() {
super();
setBackground(Color.red);
setPreferredSize(new Dimension(200, 100));
}
public Dimension getPreferredScrollableViewportSize() {
return getPreferredSize();
}
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
return 0;
}
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
return 0;
}
public boolean getScrollableTracksViewportHeight() {
return false;
}
public boolean getScrollableTracksViewportWidth() {
return false;
}
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new DialogWithScrollPane();
}
});
}
}