Add Flet desktop client

Client/Main.py

@@ -0,0 +1,105 @@
+"""SaraView's desktop client: browse and edit files in a local root directory,
+or on a SaraView server (the one on SpineS) through its API. Laid out like
+SaraFem: a directory tree on the left, the file list (or an open file) on
+the right."""
+
+import os
+import subprocess
+from typing import Optional
+
+import flet as ft
+
+from App import App
+from Browser import Browser
+from Core import (
+    AppName, ApplyAppearance, AssetsDir, BuildTheme, BundledFontFamily, EffectiveSettings, LoadConfig, Palette,
+    ResizeHandle,
+)
+from Filetree import Filetree
+from Settings import ShowSettingsDialog
+
+
+def _SetCursorThemeFallback() -> None:
+    """GTK reads XCURSOR_THEME directly and doesn't always inherit it (shows as
+    'Unable to load ... from the cursor theme'). Same fix as SaraFem's."""
+    if os.environ.get("XCURSOR_THEME"):
+        return
+    try:
+        Result = subprocess.run(["gsettings", "get", "org.gnome.desktop.interface", "cursor-theme"],
+                                capture_output=True, text=True, timeout=2)
+        Theme = Result.stdout.strip().strip("'")
+    except (OSError, subprocess.SubprocessError):
+        Theme = ""
+    os.environ["XCURSOR_THEME"] = Theme or "Adwaita"
+
+
+def Main(Page: ft.Page) -> None:
+    Config = LoadConfig()
+    Appearance = EffectiveSettings(Config)
+    ApplyAppearance(Appearance)  # before anything reads Palette.X
+
+    Page.title = AppName
+    Page.theme_mode = ft.ThemeMode.DARK
+    Page.theme = BuildTheme()
+    Page.dark_theme = BuildTheme()
+    Page.fonts = {BundledFontFamily: "fonts/Fixedsys_Excelsior_Regular.ttf"}
+    Page.window.title_bar_hidden = Appearance.HideWindowTitleBar
+    Page.padding = 0
+    Page.bgcolor = Palette.Base
+    Page.window.width = 1180
+    Page.window.height = 760
+    Page.window.min_width = 720
+    Page.window.min_height = 480
+
+    TheApp = App(Page, Config)
+
+    def OnPathChanged(Root: Optional[str], RelativePath: str, Reload: bool) -> None:
+        if Reload:  # directories may have moved, so the tree starts over
+            Tree.Reload()
+        Tree.RevealPath(Root, RelativePath)
+
+    def ShowSettings(Category: str = "General") -> None:
+        ShowSettingsDialog(TheApp, OnSettingsSaved, Category)
+
+    def OnSettingsSaved(Reconnect: bool) -> None:
+        Tree.visible = Divider.visible = Config.ShowSidebar
+        if Reconnect:
+            TheApp.Connect()  # its listeners reload the tree and the browser
+        else:
+            Body.update()
+            TheBrowser.Refresh()
+
+    def ToggleSidebar() -> None:
+        Config.ShowSidebar = not Config.ShowSidebar
+        Config.Save()
+        Tree.visible = Divider.visible = Config.ShowSidebar
+        Body.update()
+
+    def OnDrag(Delta: float) -> None:
+        Tree.width = max(140, (Tree.width or Config.SidebarWidth) + Delta)
+        Tree.update()
+
+    def OnDragEnd() -> None:
+        Config.SidebarWidth = int(Tree.width)
+        Config.Save()
+
+    TheBrowser = Browser(TheApp, OnPathChanged, lambda: ShowSettings("Connection" if TheApp.ConnectError else "General"),
+                         ToggleSidebar)
+    Tree = Filetree(TheApp, TheBrowser.NavigateTo)
+    Divider = ResizeHandle(OnDrag, OnDragEnd)
+    Tree.visible = Divider.visible = Config.ShowSidebar
+    # STRETCH so the divider gets the full height to be dragged along.
+    Body = ft.Row([Tree, Divider, TheBrowser], expand=True, spacing=0, vertical_alignment=ft.CrossAxisAlignment.STRETCH)
+    Page.add(Body)
+
+    def OnSourceChanged() -> None:
+        Tree.Reload()
+        TheBrowser.SourceChanged()
+
+    TheApp.Listeners.append(OnSourceChanged)
+    TheApp.Connect()
+
+
+if __name__ == "__main__":
+    _SetCursorThemeFallback()
+    ft.run(Main, assets_dir=str(AssetsDir))