raylib-cs/Examples/text/text_input_box.cs

using Raylib;
using static Raylib.Raylib;

public partial class Examples
{
    /*******************************************************************************************
    *
    *   raylib [text] example - Input Box
    *
    *   This example has been created using raylib 1.7 (www.raylib.com)
    *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
    *
    *   Copyright (c) 2017 Ramon Santamaria (@raysan5)
    *
    ********************************************************************************************/
    
    
    public const #define MAX_INPUT_CHARS     9

    public static void Main()
    {
        // Initialization
        //--------------------------------------------------------------------------------------
        int screenWidth = 800;
        int screenHeight = 450;
    
        InitWindow(screenWidth, screenHeight, "raylib [text] example - input box");
    
        char name[MAX_INPUT_CHARS + 1] = "\0";      // NOTE: One extra space required for line ending char '\0'
        int letterCount = 0;
    
        Rectangle textBox = { screenWidth/2 - 100, 180, 225, 50 };
        bool mouseOnText = false;
    
        int framesCounter = 0;
    
        SetTargetFPS(60);
        //--------------------------------------------------------------------------------------
    
        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            // Update
            //----------------------------------------------------------------------------------
            if (CheckCollisionPointRec(GetMousePosition(), textBox)) mouseOnText = true;
            else mouseOnText = false;
            
            if (mouseOnText)
            {
                int key = GetKeyPressed();
                
                // NOTE: Only allow keys in range [32..125]
                if ((key >= 32) && (key <= 125) && (letterCount < MAX_INPUT_CHARS))
                {
                    name[letterCount] = (char)key;
                    letterCount++;
                }
                
                if (IsKeyPressed((int)Key.BACKSPACE))
                {
                    letterCount--;
                    name[letterCount] = '\0';
                    
                    if (letterCount < 0) letterCount = 0;
                }
            }
            
            if (mouseOnText) framesCounter++;
            else framesCounter = 0;
            //----------------------------------------------------------------------------------
    
            // Draw
            //----------------------------------------------------------------------------------
            BeginDrawing();
    
                ClearBackground(RAYWHITE);
                
                DrawText("PLACE MOUSE OVER INPUT BOX!", 240, 140, 20, GRAY);
    
                DrawRectangleRec(textBox, LIGHTGRAY);
                if (mouseOnText) DrawRectangleLines(textBox.x, textBox.y, textBox.width, textBox.height, RED);
                else DrawRectangleLines(textBox.x, textBox.y, textBox.width, textBox.height, DARKGRAY);
                
                DrawText(name, textBox.x + 5, textBox.y + 8, 40, MAROON);
                
                DrawText(FormatText("INPUT CHARS: %i/%i", letterCount, MAX_INPUT_CHARS), 315, 250, 20, DARKGRAY);
    
                if (mouseOnText)
                {
                    if (letterCount < MAX_INPUT_CHARS)
                    {
                        // Draw blinking underscore char
                        if (((framesCounter/20)%2) == 0) DrawText("_", textBox.x + 8 + MeasureText(name, 40), textBox.y + 12, 40, MAROON);
                    }
                    else DrawText("Press BACKSPACE to delete chars...", 230, 300, 20, GRAY);
                }
                
            EndDrawing();
            //----------------------------------------------------------------------------------
        }
    
        // De-Initialization
        //--------------------------------------------------------------------------------------   
        CloseWindow();        // Close window and OpenGL context
        //--------------------------------------------------------------------------------------
    
        return 0;
    }
    
    // Check if any key is pressed
    // NOTE: We limit keys check to keys between 32 ((int)Key.SPACE) and 126
    bool IsAnyKeyPressed()
    {
        bool keyPressed = false;
        int key = GetKeyPressed();
    
        if ((key >= 32) && (key <= 126)) keyPressed = true;
    
        return keyPressed;
    }    
}