编辑器带有 FocusTracker (以及可观察的

The editor comes with a FocusTracker (and the observable #isFocused property) for that purpose:

editor.ui.focusTracker.on( 'change:isFocused', ( evt, name, value ) => {
    console.log( 'isFocused = ', value );
} );

请注意，只要任何用户界面具有焦点， editor.ui.focusTracker.isFocused 就是 true ，其中包括可编辑的内容以及工具栏，浮动面板等

Note that editor.ui.focusTracker.isFocused is true as long as any UI has focus, which includes the editable but also the toolbar, floating panels, etc.

确定焦点可编辑的a>，即，当插入符号闪烁并可以键入时，请改用以下监听器:

To determine the focus of the editable, i.e. when the caret is blinking and typing is possible, use this listener instead:

editor.editing.view.document.on( 'change:isFocused', ( evt, name, value ) => {
    console.log( 'editable isFocused =', value );
} );

将一个侦听器放置在另一个侦听器旁边，并使用编辑器和UI来查看区别.

Place one listener next to the other and play with the editor and the UI to see the difference.