Use pyproject.toml + uv_build

This replaces setup.py by a modern pyproject.toml using uv_build
backend.

Dependencies are being also managed by uv, so to install dependencies
and run the project one can execute:

```
uv sync
uv run pytest # optional
python -m avp
```

To build the both source and binary (wheel) distribution package run:
```
uv build
```

Uv can be installed with `pip install uv`.

The directory structure has been changed to reflect best practices.
- src/* -> src/avp/
- src/tests -> ../tests

1 files changed, 58 insertions, 0 deletions

diff --git a/src/avp/gui/preview_win.py b/src/avp/gui/preview_win.py
new file mode 100644
index 0000000..f52f8a3
--- /dev/null
+++ b/src/avp/gui/preview_win.py
@@ -0,0 +1,58 @@
+from PyQt6 import QtCore, QtGui, QtWidgets
+import logging
+
+log = logging.getLogger("AVP.Gui.PreviewWindow")
+
+
+class PreviewWindow(QtWidgets.QLabel):
+    """
+    Paints the preview QLabel in MainWindow and maintains the aspect ratio
+    when the window is resized.
+    """
+
+    def __init__(self, parent, img):
+        super().__init__()
+        self.parent = parent
+        # FIXME
+        # self.setFrameStyle(QtWidgets.QFrame.StyledPanel)
+        self.pixmap = QtGui.QPixmap(img)
+
+    def paintEvent(self, event):
+        size = self.size()
+        painter = QtGui.QPainter(self)
+        point = QtCore.QPoint(0, 0)
+        scaledPix = self.pixmap.scaled(
+            size,
+            QtCore.Qt.AspectRatioMode.KeepAspectRatio,
+            transformMode=QtCore.Qt.TransformationMode.SmoothTransformation,
+        )
+
+        # start painting the label from left upper corner
+        point.setX(int((size.width() - scaledPix.width()) / 2))
+        point.setY(int((size.height() - scaledPix.height()) / 2))
+        painter.drawPixmap(point, scaledPix)
+
+    def changePixmap(self, img):
+        self.pixmap = QtGui.QPixmap(img)
+        self.repaint()
+
+    def mousePressEvent(self, event):
+        if self.parent.encoding:
+            return
+
+        i = self.parent.listWidget_componentList.currentRow()
+        if i >= 0:
+            component = self.parent.core.selectedComponents[i]
+            if not hasattr(component, "previewClickEvent"):
+                return
+            qpoint = event.position().toPoint()
+            pos = (qpoint.x(), qpoint.y())
+            size = (self.width(), self.height())
+            butt = event.button()
+            log.info("Click event for #%s: %s button %s" % (i, pos, butt))
+            component.previewClickEvent(pos, size, butt)
+
+    @QtCore.pyqtSlot(str)
+    def threadError(self, msg):
+        self.parent.showMessage(msg=msg, icon="Critical", parent=self)
+        log.info("%", repr(self.parent))