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MessageMouseWheel

Describes additional parameters for notifications and events.

You can find more information in comments below.

struct MessageMouseWheel
{
    PointF Position;
    bool Ctrl; // Ctrl down state 
    bool Alt; // Alt/Menu down state 
    bool Shift; // Shift down state 
    bool Left; // Left mouse button down state 
    bool Middle; // Middle mouse button down state 
    bool Right; // Right mouse button down state 
    int Delta; // Scroll value 
};