Overview

In this C++ video, we demostrate how to add menus and menu items to the menubar. The application for this tutorial adds few menus to our lesson 1 project, which toggle drawing the line and ellipse from lesson 4. We begin by opening the project from C++ Win32 Lesson 1.

1. With the project open, we first open the "Win32Lesson1.rc" resource file. We do this by expanding the "Resources Files" folder in the "Solution Explorer" pane, right-clicking on "Win32Lesson1.rc," and left-clicking "View Code" in the submenu.
2. Scroll down the page and add following code to "Win32Lesson1.rc" at line 45:

POPUP "&Draw"
    BEGIN
        MENUITEM "Line"     IDM_LINE
        MENUITEM "Ellipse"  IDM_ELLIPSE
    END



3. Next open the file "Resource.h," which contains the various ID values. We can open it by expanding the "Header Files" folder in the "Solution Explorer" pane, right-clicking on "Resource.h," and left-clicking "Open" in the submenu.
4. In the "Resource.h," we add the following two lines of code at line 13:

#define IDM_LINE        110
#define IDM_ELLIPSE     111



5. Lastly, we open the code file "Win32Lesson1.cpp." To do this, we expand the "Source Files" folder in the "Solution Explorer" pane, right-click on "Win32Lesson1.cpp," and left-click "Open" in the submenu.
6. In "Win32Lesson1.cpp," add the following two lines of code at line 8 to define our boolean variables to toggling drawing:

bool gbDrawLine     = false;
bool gbDrawEllipse  = false;

7. In "Win32Lesson1.cpp," add the following eight lines of code at line 156 to handle the menu clicks and toggle drawing our line and ellipse:

case IDM_LINE:
    gbDrawLine = !gbDrawLine;
    InvalidateRect(hWnd, 0, TRUE);
    break;
case IDM_ELLIPSE:
    gbDrawEllipse = !gbDrawEllipse;
    InvalidateRect(hWnd, 0, TRUE);
    break;

8. Finally, we add the following code to "Win32Lesson1.cpp" at line 171:

HPEN hPenOld;

if (gbDrawLine) {
    // Draw a red line
    HPEN hLinePen;
    COLORREF qLineColor;
    qLineColor = RGB(255, 0, 0);
    hLinePen = CreatePen(PS_SOLID, 7, qLineColor);
    hPenOld = (HPEN)SelectObject(hdc, hLinePen);

    MoveToEx(hdc, 100, 100, NULL);
    LineTo(hdc, 500, 250);

    SelectObject(hdc, hPenOld);
    DeleteObject(hLinePen);
}

if (gbDrawEllipse) {
    // Draw a blue ellipse
    HPEN hEllipsePen;
    COLORREF qEllipseColor;
    qEllipseColor = RGB(0, 0, 255);
    hEllipsePen = CreatePen(PS_SOLID, 3, qEllipseColor);
    hPenOld = (HPEN)SelectObject(hdc, hEllipsePen);

    Arc(hdc, 100, 100, 500, 250, 0, 0, 0, 0);

    SelectObject(hdc, hPenOld);
    DeleteObject(hEllipsePen);
}



9. Now we can compile and execute the program. Selecting Draw->Line or Draw->Ellipse should toggle drawing the line or ellipse, respectively.