The Tetris window

In this application, we do not use the StandardDocument framework from the Chapter 2, Hello, Small World!. Instead, the TetrisWindow class extends the Small Windows root class Window directly. The reason is simply that we do not need the functionality of the StandardDocument framework or its base class Document. We do not use menus or accelerators, and we do not save or load files:


class TetrisWindow : public Window { 
    TetrisWindow(WindowShow windowShow); 

In this application, we ignore the mouse. Instead, we look into keyboard handling. The OnKeyDown method is called when the user presses or releases a key:

    bool OnKeyDown(WORD key, bool shiftPressed, 
                   bool controlPressed); 

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