JTabbedPane.getTabComponentAt(int) 返回 null [英] JTabbedPane.getTabComponentAt(int) returning null

问题描述

我有以下代码:

JTabbedPane container;
...
AWindow page = WinUtils.buildWindow();
boolean existing = checkIfExists(page); // in this code, this will always be false
if(!existing)
{
    String tabName = page.getLoadedFileLocation().getName();
    container.addTab(page.getLoadedFileLocation().getName(), page);
}
Component comp = container.getTabComponentAt(0);
int sel = container.getSelectedIndex();
container.setSelectedComponent(page);

事情是:

container.getTabComponentAt(0)

返回null.另一个奇怪的事情是:

returns null. The other weird thing is :

container.getSelectedIndex()

返回0.我认为应该发生的合乎逻辑的事情是引用创建的窗口.为什么我收到 null?我做错了什么?

returns 0. The logical thing that I think should happen, is to have a reference to the created window. Why am I receiving null? What am I doing wrong?

推荐答案

getTabComponentAt() 返回您可能添加为选项卡标题的自定义组件.您可能正在寻找 getComponentAt() 方法来返回选项卡的内容.getSelectedIndex() 只返回当前选择了第一个选项卡(如果没有选择选项卡，它将返回 -1)

getTabComponentAt() returns the custom component you might add as the tab title. You might be looking for the getComponentAt() method to return the contents of a tab. The getSelectedIndex() just returns that the first tab is currently selected (it would return -1 for no tabs selected)

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