添加深色模式

app/views/theme_manager.py

@@ -0,0 +1,134 @@
+"""主题管理：注册 Calman 风格深色主题 + 提供运行时切换。
+
+主题在启动时通过 ``apply_initial_theme(root_style)`` 注入到 ttkbootstrap，
+当前选择持久化到 ``settings/ui_preferences.json``。运行时调用
+``toggle_theme(root_style)`` / ``set_theme(root_style, name)`` 可即时切换，
+并自动重新调用 ``apply_modern_styles()`` 让自定义样式跟上新色板。
+"""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Optional
+
+from ttkbootstrap.style import Style, ThemeDefinition
+
+from app.views.modern_styles import apply_modern_styles
+
+
+_PREFS_PATH = Path("settings/ui_preferences.json")
+
+# 浅色主题：沿用旧的 yeti（首发布兼容）
+LIGHT_THEME = "yeti"
+# 深色主题：自定义 Calman 风格
+DARK_THEME = "calman_dark"
+
+
+# ----------------------------------------------------------------------
+# Calman 风格深色主题色板（参考实测截图取色）
+# ----------------------------------------------------------------------
+_CALMAN_DARK_COLORS = {
+    "primary": "#343A41",     # 主色改为炭灰，避免大面积亮蓝
+    "secondary": "#444A51",   # 中性深灰（用于 header / 分组背景）
+    "success": "#4FB960",
+    "info": "#6FAFCC",        # 降低饱和度，只做少量点缀
+    "warning": "#F2A93B",
+    "danger": "#E0524A",
+    "light": "#BFC6CE",       # 高亮文本
+    "dark": "#0D1014",        # 最深背景（侧栏底色）
+    "bg": "#1B1F24",          # 主窗口背景
+    "fg": "#E4E8EE",          # 主文本颜色
+    "selectbg": "#5A6169",
+    "selectfg": "#E4E8EE",
+    "border": "#2A2F36",
+    "inputfg": "#E4E8EE",
+    "inputbg": "#24292F",
+    "active": "#2A2F36",
+}
+
+
+def register_themes() -> None:
+    """把自定义深色主题注册到 ttkbootstrap（可重复调用，幂等）。"""
+    style = Style()
+    if DARK_THEME in style.theme_names():
+        return
+    theme_def = ThemeDefinition(
+        name=DARK_THEME,
+        themetype="dark",
+        colors=_CALMAN_DARK_COLORS,
+    )
+    style.register_theme(theme_def)
+
+
+# ----------------------------------------------------------------------
+# 偏好持久化
+# ----------------------------------------------------------------------
+def _read_prefs() -> dict:
+    try:
+        return json.loads(_PREFS_PATH.read_text(encoding="utf-8"))
+    except (FileNotFoundError, json.JSONDecodeError):
+        return {}
+
+
+def _write_prefs(data: dict) -> None:
+    try:
+        _PREFS_PATH.parent.mkdir(parents=True, exist_ok=True)
+        _PREFS_PATH.write_text(
+            json.dumps(data, indent=2, ensure_ascii=False), encoding="utf-8"
+        )
+    except OSError:
+        # 写入失败不应影响 UI
+        pass
+
+
+def get_saved_theme() -> Optional[str]:
+    return _read_prefs().get("theme")
+
+
+def save_theme(name: str) -> None:
+    prefs = _read_prefs()
+    prefs["theme"] = name
+    _write_prefs(prefs)
+
+
+# ----------------------------------------------------------------------
+# 主题应用 / 切换
+# ----------------------------------------------------------------------
+def apply_initial_theme() -> str:
+    """启动时调用：注册主题 + 加载偏好 + 切到对应主题。
+
+    返回最终生效的主题名。
+    """
+    register_themes()
+    name = get_saved_theme() or LIGHT_THEME
+    style = Style()
+    if name not in style.theme_names():
+        name = LIGHT_THEME
+    style.theme_use(name)
+    apply_modern_styles()
+    return name
+
+
+def set_theme(name: str) -> str:
+    """切换到指定主题，持久化偏好，并刷新自定义样式。"""
+    register_themes()
+    style = Style()
+    if name not in style.theme_names():
+        name = LIGHT_THEME
+    style.theme_use(name)
+    apply_modern_styles()
+    save_theme(name)
+    return name
+
+
+def toggle_theme() -> str:
+    """在浅 / 深之间切换。返回新主题名。"""
+    style = Style()
+    current = style.theme.name
+    target = DARK_THEME if current != DARK_THEME else LIGHT_THEME
+    return set_theme(target)
+
+
+def is_dark() -> bool:
+    return Style().theme.name == DARK_THEME