// BackColor.lnl - Mark Chipman / Kinex

application PE GUI entry main; 

include "win32a.inc";

const Black   = $00000000; const DkGray  = $00808080; 
const LtGray  = $00C0C0C0; const White   = $00FFFFFF; 
const Red     = $000000FF; const Green   = $0000FF00; 
const Blue    = $00FF0000; const Yellow  = $0000FFFF; 
const Magenta = $00FF00FF; const Cyan    = $00FFFF00;

const WHITE_BRUSH = $0; 

MSG myMsg; WNDCLASS wc;

dword hWindow; dword hMenu; dword hMenuPopdown;
dword dwColor; dword hBrush; string buffer[256]; 

frame WndProc(dword hwnd, dword message, dword wparam, dword lparam); 
    if (message = WM_DESTROY) {PostQuitMessage(0);}
    if (message = WM_COMMAND) {
        if (wparam = 1011) {
            PostMessage(hwnd, WM_CLOSE, 0, 0); 
            return(0); 
        }
        if (wparam = 1001) {dwColor = Black;} 
        if (wparam = 1002) {dwColor = DkGray;}
        if (wparam = 1003) {dwColor = LtGray;}
        if (wparam = 1004) {dwColor = White;} 
        if (wparam = 1005) {dwColor = Red;} 
        if (wparam = 1006) {dwColor = Green;} 
        if (wparam = 1007) {dwColor = Blue;} 
        if (wparam = 1008) {dwColor = Yellow;} 
        if (wparam = 1009) {dwColor = Magenta;} 
        if (wparam = 1010) {dwColor = Cyan;} 

        hBrush = CreateSolidBrush(dwColor); 
        SetClassLong(hwnd, GCL_HBRBACKGROUND, hBrush); 
        InvalidateRect(hwnd, 0, 1); 
        if (hBrush) {DeleteObject(hBrush);} 
        return(0); 
    } 
    return(DefWindowProc(hwnd, message, wparam, lparam)); 
end; 

frame main();  
    wc.style = CS_HREDRAW + CS_VREDRAW; 
    wc.lpfnWndProc = @WndProc; 
    wc.cbClsExtra = 0; 
    wc.cbWndExtra = 0; 
    wc.hInstance = Instance; 
    wc.hIcon = LoadIcon(0, IDI_APPLICATION); 
    wc.hCursor = LoadCursor(0, IDC_ARROW); 
    wc.hbrBackground = GetStockObject(WHITE_BRUSH); 
    wc.lpszMenuName = ""; 
    wc.lpszClassName = "BkgColorClass"; 

    if (RegisterClass(wc) = 0) { 
        MessageBox(0, "RegisterClass failed.", "BkgColor", 0); 
        ExitProcess(0); 
    } 
    
    hMenu = CreateMenu(); 
    hMenuPopdown = CreateMenu(); 

    AppendMenu(hMenuPopdown, MF_STRING, 1001, "Black"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1002, "Gray (Dark)"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1003, "Gray (Light)"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1004, "White"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1005, "Red"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1006, "Green"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1007, "Blue"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1008, "Yellow"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1009, "Magenta"); 
    AppendMenu(hMenuPopdown, MF_STRING, 1010, "Cyan"); 
    AppendMenu(hMenuPopdown, MF_SEPARATOR, 0, ""); 
    AppendMenu(hMenuPopdown, MF_STRING, 1011, "Exit"); 
    AppendMenu(hMenu, MF_POPUP ,hMenuPopdown, "Color");        
    
    hWindow = CreateWindowEx($40000+$100, "BkgColorClass",
                    "Background Color",
                    $CF0000+$10000000, 
                    100, 100, 400, 400,
                    0, hMenu, Instance, 0);
    
    if (hWindow = 0) { 
        MessageBox(0, "CreateWindowEx failed.", "BkgColor", 0); 
        UnregisterClass("BkgColorClass", Instance); 
        ExitProcess(0); 
    } 

    ShowWindow(hWindow, SW_SHOWNORMAL); 
    UpdateWindow(hWindow); 

    while (GetMessage(@myMsg, 0, 0, 0) > 0) { 
        TranslateMessage(@myMsg); 
        DispatchMessage(@myMsg); 
    } 
    
    UnregisterClass("BkgColorClass", Instance); 
end;