{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "591e63f6",
   "metadata": {},
   "source": [
    "# 18-21 · System kolorów\n",
    "\n",
    "Praktyka do sekcji [„System Kolorów”"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "eceb45de",
   "metadata": {},
   "source": [
    "## Cel\n",
    "\n",
    "Wybór kolorów i uczciwa kontrola anulowania colorchooser."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5999f5a8",
   "metadata": {},
   "source": [
    "## Pro mainloop() w tym laptopie\n",
    "\n",
    "Zamiast `root.mainloop()` używany tutaj `root.update()` + `root.destroy()` jest takie, że aplikacja jest zbudowana dokładnie tak samo, tylko bez niekończącego się oczekiwania na końcu (zobacz wyjaśnienie w rozdziale 16)."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1621f26a",
   "metadata": {},
   "source": [
    "## Sprawa robocza"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "2be0767f",
   "metadata": {
    "execution": {
     "iopub.execute_input": "2026-09-03T00:52:00.349512Z",
     "iopub.status.busy": "2026-09-03T00:52:00.349370Z",
     "iopub.status.idle": "2026-09-03T00:52:00.454938Z",
     "shell.execute_reply": "2026-09-03T00:52:00.454334Z"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Текущий цвет: #111827\n"
     ]
    }
   ],
   "source": [
    "import tkinter as tk\n",
    "\n",
    "PALETTE = [(\"Чёрный\", \"#111827\"), (\"Красный\", \"#dc2626\"), (\"Синий\", \"#2563eb\")]\n",
    "\n",
    "root = tk.Tk()\n",
    "current_color = tk.StringVar(value=PALETTE[0][1])\n",
    "\n",
    "def set_color(hex_color):\n",
    "    current_color.set(hex_color)\n",
    "\n",
    "toolbar = tk.Frame(root)\n",
    "toolbar.pack()\n",
    "for name, hex_color in PALETTE:\n",
    "    tk.Button(toolbar, bg=hex_color, width=2, command=lambda c=hex_color: set_color(c)).pack(side=\"left\")\n",
    "\n",
    "root.update()\n",
    "print(\"Текущий цвет:\", current_color.get())\n",
    "root.destroy()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f569079b",
   "metadata": {},
   "source": [
    "## Zadanie niezależne od zadania ★★\n",
    "\n",
    "Napisz funkcję `choose_custom_color()`to powoduje `tkinter.colorchooser.askcolor()`i wyraźnie sprawdź `hex_color is not None` przed wywołaniem `set_color(hex_color)` — co się stanie, jeśli usuniesz ten check-up i klikniesz „Anuluj”"
   ]
  }
 ],
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  "kernelspec": {
   "display_name": "Cartesian Python 3.14",
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   "name": "cartesian-python314"
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   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
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