Initial commit

Preview.py

@@ -0,0 +1,96 @@
+"""Preview pane: shows the content of the currently selected file.
+SaraTag tags live in their own panel now (Tags.py), not here."""
+
+from pathlib import Path
+from typing import Optional
+
+import flet as ft
+
+from Core import AppConfig, Palette
+from Thumbnails import GetThumbnail, IsThumbnailable
+
+TextExtensions = {
+    ".txt", ".md", ".py", ".json", ".toml", ".yaml", ".yml", ".js", ".ts",
+    ".css", ".html", ".htm", ".csv", ".log", ".sh", ".fish", ".cfg", ".ini",
+    ".scad", ".xml", ".ipynb",
+}
+TextPreviewCharLimit = 4000
+
+
+def HumanSize(NumBytes: int) -> str:
+    Size = float(NumBytes)
+    for Unit in ("B", "KB", "MB", "GB"):
+        if Size < 1024 or Unit == "GB":
+            return f"{Size:.0f} {Unit}" if Unit == "B" else f"{Size:.1f} {Unit}"
+        Size /= 1024
+    return f"{Size:.1f} TB"
+
+
+class Preview(ft.Container):
+    def __init__(self, Config: AppConfig, Side: str = "right"):
+        self.Config = Config
+        self.Body = ft.Column(
+            expand=True,
+            alignment=ft.MainAxisAlignment.CENTER,
+            horizontal_alignment=ft.CrossAxisAlignment.CENTER,
+        )
+        BorderSide = ft.BorderSide(1, Palette.Surface1)
+        Border = ft.Border(right=BorderSide) if Side == "left" else ft.Border(left=BorderSide)
+
+        self.Body.controls = self._BuildContent(None)
+
+        super().__init__(
+            content=self.Body,
+            width=Config.PreviewWidth,
+            padding=16,
+            bgcolor=Palette.Mantle,
+            border=Border,
+        )
+
+    def ShowPath(self, EntryPath: Optional[Path]) -> None:
+        self.Body.controls = self._BuildContent(EntryPath)
+        self.update()
+
+    def _BuildContent(self, EntryPath: Optional[Path]) -> list[ft.Control]:
+        if EntryPath is None:
+            return [ft.Text("Nothing selected.", color=Palette.Overlay0)]
+
+        if not EntryPath.exists():
+            return [ft.Text("This no longer exists.", color=Palette.Overlay0)]
+
+        if EntryPath.is_dir():
+            return [
+                ft.Icon(ft.Icons.FOLDER, size=48, color=Palette.Mauve),
+                ft.Text(EntryPath.name, weight=ft.FontWeight.BOLD, text_align=ft.TextAlign.CENTER),
+                ft.Text("Directory", color=Palette.Overlay0),
+            ]
+
+        if IsThumbnailable(EntryPath):
+            ThumbnailPath = GetThumbnail(EntryPath, Size=(512, 512))
+            if ThumbnailPath is not None:
+                return [
+                    ft.Image(src=str(ThumbnailPath), fit=ft.BoxFit.CONTAIN, expand=True),
+                    ft.Text(EntryPath.name, text_align=ft.TextAlign.CENTER),
+                ]
+
+        if EntryPath.suffix.lower() in TextExtensions:
+            try:
+                Content = EntryPath.read_text(errors="replace")[:TextPreviewCharLimit]
+            except OSError:
+                Content = None
+            if Content is not None:
+                return [
+                    ft.Text(EntryPath.name, weight=ft.FontWeight.BOLD),
+                    ft.Container(
+                        content=ft.Text(Content, selectable=True, size=12),
+                        expand=True,
+                        alignment=ft.Alignment.TOP_LEFT,
+                    ),
+                ]
+
+        Stat = EntryPath.stat()
+        return [
+            ft.Icon(ft.Icons.INSERT_DRIVE_FILE_OUTLINED, size=48, color=Palette.Overlay0),
+            ft.Text(EntryPath.name, weight=ft.FontWeight.BOLD, text_align=ft.TextAlign.CENTER),
+            ft.Text(HumanSize(Stat.st_size), color=Palette.Overlay0),
+        ]