made loading async + added progress bar

src/editor.py

@@ -1,4 +1,5 @@
 import os
+from enum import Enum, auto
 from math import floor
 from typing import Optional
 
@@ -30,17 +31,24 @@ class Editor:
         self.clock: pygame.time.Clock = pygame.time.Clock()
         self.drag_pos: Optional[tuple[int, int]] = None
         self.font: pygame.font.Font = pygame.font.SysFont("Ubuntu", 20)
+        self.loading_font: pygame.font.Font = pygame.font.SysFont("Ubuntu", 30)
         self.zooms_texts: list[pygame.Surface] = list(map(
             lambda z: self.font.render(str(z), True, (255, 255, 255)),
             self.ZOOMS
         ))
+        self.state: State = State.STOPPING
 
     def mainloop(self) -> None:
-        self.running = True
+        self.state = State.LOADING
-        while self.running:
+        while self.state != State.STOPPING:
             pygame.display.set_caption(f"Lycacraft Map Editor - {self.clock.get_fps():.2f}fps")
             self.process_events()
-            self.render()
+            if self.state == State.LOADING:
+                self.render_loading()
+                if not self.image_handler.loading:
+                    self.state = State.RUNNING
+            elif self.state == State.RUNNING:
+                self.render()
             self.clock.tick(30)
 
     def process_events(self) -> None:
@@ -48,13 +56,13 @@ class Editor:
 
         for event in events:
             if event.type == pygame.QUIT:
-                self.running = False
+                self.state = State.STOPPING
             elif event.type == pygame.WINDOWRESIZED:
                 self.width = event.x
                 self.height = event.y
             elif event.type == pygame.KEYDOWN:
                 if event.key == pygame.K_ESCAPE:
-                    self.running = False
+                    self.state = State.STOPPING
                 elif event.key == pygame.K_PAGEUP:
                     self.zoom_in()
                 elif event.key == pygame.K_PAGEDOWN:
@@ -156,6 +164,24 @@ class Editor:
             pygame.draw.circle(self.win, col, [zoom_x, y], zoom_r)
             self.win.blit(txt, [zoom_x - txt.get_width() - zoom_r - 5, y - txt.get_height() / 2])
 
+    def render_loading(self) -> None:
+        self.win.fill((0, 0, 0))
+        count = self.image_handler.count
+        total = self.image_handler.total
+        txt = self.loading_font.render(f"Loading maps - {count}/{total}", True, (255, 255, 255))
+
+        width = self.width * 0.6
+        height = self.height * 0.05
+        w2 = self.width / 2
+        h2 = self.height / 2
+        x0 = w2 - width / 2
+        y0 = h2 - height / 2
+        pygame.draw.rect(self.win, (160, 160, 160), [x0, y0, width, height])
+        pygame.draw.rect(self.win, (90, 250, 90), [x0, y0, width * count / total, height])
+        self.win.blit(txt, [w2 - txt.get_width() / 2, y0 - txt.get_height() - 5])
+
+        pygame.display.flip()
+
     def set_zoom(self, zoom_i: int) -> None:
         self.zoom_i = max(0, min(len(self.ZOOMS) - 1, zoom_i))
         self.zoom = self.ZOOMS[self.zoom_i]
@@ -173,3 +199,9 @@ class Editor:
         world_z = floor((y - h2) / self.zoom + self.center[1])
 
         return int(world_x), int(world_z)
+
+
+class State(Enum):
+    STOPPING = auto()
+    LOADING = auto()
+    RUNNING = auto()

src/image_handler.py

@@ -1,4 +1,5 @@
 import os
+import threading
 from math import floor
 from typing import Optional
 
@@ -10,19 +11,29 @@ class ImageHandler:
         self.maps_dir: str = maps_dir
         self.base_size: int = base_size
         self.cache: dict = {}
-        self.load_base_images()
+        self.count: int = 0
+        self.total: int = 0
+        self.loading: bool = False
+
+        t = threading.Thread(target=self.load_base_images)
+        t.start()
 
     def load_base_images(self) -> None:
         cache = {}
-
+        paths = os.listdir(self.maps_dir)
-        for path in os.listdir(self.maps_dir):
+        self.loading = True
+        self.count = 0
+        self.total = len(paths)
+        for path in paths:
             fullpath = os.path.join(self.maps_dir, path)
             name, x, y = path.split(".")[0].split("_")
             cache[(int(x), int(y))] = pygame.image.load(fullpath).convert_alpha()
+            self.count += 1
 
         self.cache = {
             1: cache
         }
+        self.loading = False
 
     def get_for_pos(self, x: int, y: int, zoom: float = 1) -> Optional[pygame.Surface]:
         cache = self.cache.get(zoom, {})