Checks the status of the shift key while dragging and dropping files,

Checks the status of the shift key while dragging and dropping files,

The boss wants to add extended categories to the drag-and-drop function of the original file, so he wants to determine the shift key status when dragging and dropping the file.

Generally, keydown and keyup are used to determine whether the key is pressed or not. However, the control event is triggered, but the key event cannot be triggered during drag-and-drop. Therefore, other checks are required.

Baidu found the following sentence:

1 if (Control. ModifierKeys = Keys. Shift)
// Keys Control. ModifierKeys returns the current modification key status, ALT, SHIFT, CTRL2 {3 shiftDown = true; 4} 5 else6 {7 shiftDown = false; 8}

Execute this in the drag-and-drop event of the file to get the shift status and differentiate the response.