在MacOS上取消装饰JInternalFrame [英] Undecorate JInternalFrame on MacOS

问题描述

我正在尝试取消装饰 JInternalFrame ，即使用以下代码删除默认标题栏；

I am trying to undecorate a JInternalFrame, i.e. remove the default titlebar using the following code;

BasicInternalFrameUI ui = (BasicInternalFrameUI)internalFrame.getUI();
ui.getNorthPane().setPrefrredSize(new Dimension(0,0));

我在Windows上工作，但第二行在MacOS上抛出NullPointerException

I works on windows but the second line throws a NullPointerException on MacOS

任何想法为何以及如何解决?

Any ideas why and how to get round it?

推荐答案

在Mac上，JInternalFrame没有北面板.仅在无Mac OS平台上执行代码；

On Mac, the JInternalFrame doesn't have a north pane. Only execute the code on none Mac OS platforms;

// only remove the northpanel for none Mac OS
if(!(System.getProperty("os.name").startsWith("Mac OS"))){
    BasicInternalFrameUI ui = (BasicInternalFrameUI) getUI();
    ui.getNorthPane().setPrefrredSize(new Dimension(0,0));
}

关于跨平台的很多内容:-(

So much about cross platform :-(

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