ChartPanel 未在 GUI 中注册为组件

Question

我有以下输出。

Recursive call for org.jfree.chart.ChartPanel[chartpanelBoa
Component count 0 for org.jfree.chart.ChartPanel[chartpanelBoa

我运行得到这个输出的代码是

public void enableEverything(Container c){
Component [] p = c.getComponents();
System.out.println("Component count " + c.getComponentCount() + " for " +   
                                c.toString().substring(0,40)  );
for(Component pp : p){
pp.setEnabled(true);
if(pp instanceof Container){
System.out.println("Recursive call for " + pp.toString().substring(0,40));
enableEverything((Container) pp);
}
else System.out.println("No recursive call");
}



}

ChartPanel 可以在我的 JPanel 中看到，但是它不会计算图表面板。我期待

的输出

org.jfree.chart.ChartPanel[chartpanelBoa

的组件计数 1

计算组件的幕后是什么？

Answer 1

如 org.jfree.chart.ChartPanel, a ChartPanel is a JPanel, but it contains no nested instances of Component. A handful of Swing components are imported to handle a context menu, tooltips, etc., but the enclosed JFreeChart itself is pure Java2D 的来源所示。

您似乎想在禁用图表时更改图表的视觉表示。您仍然可以使用 setBackgroundPaint() 或 setBackgroundImageAlpha().

调用 setEnabled() on the ChartPanel itself to leverage the JPanel UI delegate. You can also modify the interior of the chart as desired; this 使背景变暗

ChartPanel 未在 GUI 中注册为组件

ChartPanel not registering as a component in a GUI

java

swing

components

jfreechart