Add Focuser Example for PyQt Applications

focus/FocuserPyQt_Example.py

@@ -0,0 +1,85 @@
+from PyQt5 import QtWidgets, QtGui, QtCore
+import subprocess
+import time
+from Focuser import Focuser
+
+
+class FocuserExample(QtWidgets.QMainWindow):
+
+    def __init__(self):
+        super().__init__()
+        self.setMinimumSize(QtCore.QSize(800, 600))
+        self.setMaximumSize(QtCore.QSize(800, 600))
+        self.setWindowTitle('Focus Example')
+        self.setStyleSheet("background: #1B1E28;\n"
+"font-family: \'Lato\';\n"
+"font-style: normal;\n"
+"font-weight: 400;\n"
+"font-size: 16px;\n"
+"line-height: 17px;\n"
+"color: #D1D8EA;")
+
+        self.mainWidget = QtWidgets.QWidget()
+        self.setCentralWidget(self.mainWidget)
+
+        self.layout = QtWidgets.QHBoxLayout(self.mainWidget)
+
+        self.previewWidget = QtWidgets.QWidget(self.mainWidget)
+        self.previewWidget.setStyleSheet("border: 1px solid #27385E;\n"
+"border-radius: 10px;")
+
+        self.focusSlider = QtWidgets.QSlider(self.mainWidget)
+        self.focusSlider.setMinimumSize(QtCore.QSize(150, 40))
+        self.focusSlider.setMaximumSize(QtCore.QSize(150, 40))
+        self.focusSlider.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
+        self.focusSlider.setMouseTracking(True)
+        self.focusSlider.setTabletTracking(True)
+        self.focusSlider.setStyleSheet("border: 3px solid #27389E;\n"
+"border-radius: 0px;")
+        self.focusSlider.setMinimum(0)
+        self.focusSlider.setMaximum(1023)
+        self.focusSlider.setSingleStep(50)
+        self.focusSlider.setOrientation(QtCore.Qt.Horizontal)
+        self.focusSlider.setTickPosition(QtWidgets.QSlider.TicksBelow)
+        self.focusSlider.setTickInterval(50)
+        self.focusSlider.setObjectName("focusSlider")
+        self.focusSlider.valueChanged.connect(self.changeFocus)
+
+        self.layout.addWidget(self.previewWidget)
+        self.layout.addWidget(self.focusSlider)
+
+        self.previewLayout = QtWidgets.QHBoxLayout(self.previewWidget)
+
+    def startPreview(self):
+        self.process = subprocess.Popen("libcamera-hello -t 0 -p 0,0,640,480 --viewfinder-width 1280  --viewfinder-height 720", shell=True)
+        time.sleep(2)
+        previewWindow = QtGui.QWindow.fromWinId(0x2400002)
+        previewContainer = QtWidgets.QWidget.createWindowContainer(previewWindow)
+        previewContainer.setMinimumSize(QtCore.QSize(640, 480))
+        self.previewLayout.addWidget(previewContainer)
+
+    def startFocuser(self):
+        try:
+            focuser = Focuser('/dev/v4l-subdev1')
+            focuser.step = 1
+        finally:
+            self.focusSlider.setValue(focuser.get(Focuser.OPT_FOCUS))
+
+    def changeFocus(self, value):
+        try:
+            focuser = Focuser('/dev/v4l-subdev1')
+            focuser.step = 1
+        finally:
+            if value > focuser.get(Focuser.OPT_FOCUS):
+                focuser.set(Focuser.OPT_FOCUS, value)
+            elif value < focuser.get(Focuser.OPT_FOCUS):
+                focuser.set(Focuser.OPT_FOCUS, value)
+
+
+if __name__ == "__main__":
+    import sys
+    app = QtWidgets.QApplication(sys.argv)
+    window = FocuserExample()
+    window.show()
+    window.startPreview()
+    sys.exit(app.exec_())