For a Winforms textbox, when you click and drag over the text, it highlights it. Is there a way to determine which direction the user dragged over?
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There is no way to get this info using the Windows TextBox selection API. For example, the
EM_GETSEL
message defines the starting and ending character positions of the selection, but in a predefined (sorted) order.However you could get this info by handling the control's
MouseMove
event. For example:By applying some logic to
mouseX
you could potentially discover the average direction the cursor is moving. It would work best if the user is making a linear motion. You could also handle the textbox's drag-and-drop event for similar mouse information if you only wanted the event raised while the user was dragging the mouse.