Is there a way to detect users select all content?

问题

I'm implementing a plugin and have a use case need to detect when user select all content. I trying create a select all selection like this const selectAllSelection = editor.model.createSelection(editor.model.document.getRoot(), 'in') and compare with current model.document.selection but they are not the same.

回答1:

Those selections are a bit different as the one created with createSelection() will start directly in <$root>. Real document selection will start inside the first <paragraph>. That makes the comparison a bit tricky.

But, it's not that bad:

• check whether the selection has just one range,
• get the first range of document selection (selection.getFirstRange()) and use model.createRangeIn( editor.model.document.getRoot() ) to create a range inside the root,
• the ranges will differ due to what I described, so we can't do range.isEqual(). We need to check the start and end positions with isTouching().

This would look more or less like this:

function doesSelectAll( selection ) {
    if ( selection.rangeCount != 1 ) {
        return false;
    }
    
    const firstSelectionRange = selection.getFirstRange();
    const rootRange = editor.model.createRangeIn( editor.model.document.getRoot() );

    return firstSelectionRange.start.isTouching( rootRange.start ) && firstSelectionRange.end.isTouching( rootRange.end );
}

来源：https://stackoverflow.com/questions/62566550/is-there-a-way-to-detect-users-select-all-content