Implementing Scrollbars: Step 4

Modify the Color.H file to add some global variables to support scrolling.

int nScrollInc; /* Scrolling increment */ 
int ClientWidth, ClientHeight, BottomBarThickness, RightBarThickness; /* Client area metrics */ 
int DisplayWidth, DisplayHeight; 
RECT ScrollRect; /* Used in WM_HSCROLL and WM_VSCROLL to make scrolling smoother */ 
RECT rLeadDest, rLeadSource; 
RECT rClientSize; 

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