Day3 教学示例：增强版计算器接入 + QMainWindow/QSS 两版参考实现

- calculator_designer_ext（Day2 增强版：表达式求值 + 括号，递归下降解析器）接入 cmake - calculator_mainwindow（Day3 上午）：增强版计算器装进 QMainWindow，菜单/状态栏/历史停靠窗，纯代码 + 显式 connect，与 mainwindow_showcase 形成坑卡对照 - calculator_mainwindow_qss（Day3 下午）：上午版 + QSS 双主题美化（按键分色/伪状态/深浅切换） - 验证 mainwindow_showcase（QMainWindow 六大组件综合演示，.ui + .qrc） - OUTLINE_4DAY.md / ASSIGNMENTS.md Day3 衔接增强版起点 + 参考实现指引 - 补提交 Day2 calculator/ 与 calculator_designer/ 参考实现（CMakeLists 已引用） - 全量构建 28/28，4 目标离屏自测退出码 0 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-07 22:59:05 +08:00
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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""生成 qt_mainwindow_showcase 所需的极简 PNG 图标。
+
+仅用 Python 标准库（zlib + struct）手写最小 PNG 编码器，无第三方依赖。
+幂等：重复运行覆盖生成相同文件。
+
+  python gen_icons.py        # *nix / 已配置 py 启动器的 Windows
+  py gen_icons.py            # Windows 官方 py 启动器
+"""
+import os
+import struct
+import zlib
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+ICONS_DIR = os.path.join(HERE, "icons")
+
+# 5×7 点阵字模（"1" = 前景白色像素）
+GLYPHS = {
+    "M": ["10001", "11011", "10101", "10001", "10001", "10001", "10001"],
+    "N": ["10001", "11001", "10101", "10011", "10001", "10001", "10001"],
+    "Q": ["01110", "10001", "10001", "10001", "10101", "10011", "01111"],
+    "A": ["01110", "10001", "10001", "11111", "10001", "10001", "10001"],
+    "D": ["11110", "10001", "10001", "10001", "10001", "10001", "11110"],
+}
+
+
+def write_png(path, width, height, rgb_rows):
+    """写一张 8 位、颜色类型 2（RGB）的 PNG。rgb_rows: 每行 width*3 个 0-255 整数。"""
+    def chunk(tag, data):
+        body = tag + data
+        return (struct.pack(">I", len(data)) + body +
+                struct.pack(">I", zlib.crc32(body) & 0xffffffff))
+
+    sig = b"\x89PNG\r\n\x1a\n"
+    ihdr = struct.pack(">IIBBBBB", width, height, 8, 2, 0, 0, 0)
+    raw = b"".join(b"\x00" + bytes(row) for row in rgb_rows)  # 每行前加 filter byte(0)
+    idat = zlib.compress(raw, 9)
+    with open(path, "wb") as f:
+        f.write(sig + chunk(b"IHDR", ihdr) + chunk(b"IDAT", idat) + chunk(b"IEND", b""))
+
+
+def make_icon(size, bg, letter):
+    """生成 size×size 的像素矩阵：纯色背景 + 居中白色字母。"""
+    glyph = GLYPHS[letter]
+    bw, bh = 5, 7
+    pix = 1 if size <= 16 else 2          # 16px 用 1:1 字模，32px 放大 2 倍
+    gw, gh = bw * pix, bh * pix
+    ox = (size - gw) // 2
+    oy = (size - gh) // 2
+    rows = []
+    for y in range(size):
+        row = []
+        for x in range(size):
+            gx, gy = (x - ox) // pix, (y - oy) // pix
+            if 0 <= gx < bw and 0 <= gy < bh and glyph[gy][gx] == "1":
+                row.extend((255, 255, 255))
+            else:
+                row.extend(bg)
+        rows.append(row)
+    return rows
+
+
+# (文件名, 尺寸, 背景色 RGB, 字母)
+SPECS = [
+    ("app.png",   32, (30, 80, 180),  "M"),
+    ("new.png",   16, (40, 150, 70),  "N"),
+    ("quit.png",  16, (200, 50, 50),  "Q"),
+    ("about.png", 16, (220, 140, 30), "A"),
+    ("dock.png",  16, (130, 60, 180), "D"),
+]
+
+
+def main():
+    os.makedirs(ICONS_DIR, exist_ok=True)
+    for name, size, bg, letter in SPECS:
+        write_png(os.path.join(ICONS_DIR, name), size, size, make_icon(size, bg, letter))
+        print(f"wrote {name} ({size}x{size})")
+    print(f"done -> {ICONS_DIR}")
+
+
+if __name__ == "__main__":
+    main()