Better folder organization

src/fixed_aspect_ratio_label.py

@@ -0,0 +1,38 @@
+from PyQt5.QtWidgets import QLabel
+from PyQt5.QtCore import Qt
+
+
+class FixedAspectRatioLabel(QLabel):
+    """Subclass QLabel. A resizable label class."""
+
+    def __init__(self, parent=None):
+        """Initialize the instance. Set the pixmap to None."""
+        super().__init__(parent)
+        self.pixmap = None
+
+    def set_default_stylesheet(self):
+        """Set the initial stylesheet of the label."""
+        self.setStyleSheet("""border-width: 1px;
+        border-style: solid;
+        border-color: black;""")
+
+    def make_transparent(self):
+        """Make the label transparent.
+
+        Remove text and border."""
+        self.setText('')
+        self.setStyleSheet("border-width: 0px;")
+
+    def apply_pixmap(self):
+        """Apply a scaled pixmap without modifying the dimension of the original one."""
+        if self.pixmap:
+            self.setPixmap(
+                self.pixmap.scaled(
+                    self.size(), Qt.IgnoreAspectRatio, Qt.SmoothTransformation
+                )
+            )
+
+    def rescale(self, size):
+        """Rescale the widget and the displayed pixmap to the given size."""
+        self.resize(size)
+        self.apply_pixmap()