Add input field to display and navigate video frame number

This commit introduces a new feature to the video slider component. An input field has been added to the top left corner of the slider. This field displays the current frame number, allowing users to easily track their progress within the video. Additionally, users can now input a specific frame number into the field and, upon pressing enter, the slider will jump to that frame, enabling seamless navigation within the video timeline.

annolid/gui/widgets/video_slider.py

@@ -238,8 +238,31 @@ def __init__(
         self.headerSeries = dict()
         self._draw_header()
 
+        # Adding QLineEdit for input value
+        self.input_value = QtWidgets.QLineEdit(str(self.value()), self)
+        self.input_value.setFixedWidth(60)
+        self.input_value.setAlignment(QtCore.Qt.AlignCenter)
+        self.input_value.editingFinished.connect(self.updateValueFromInput)
+        self.input_value.move(2, 2)
+
     # Methods to match API for QSlider
 
+    def updateValueFromInput(self):
+        # Get the input text
+        input_text = self.input_value.text()
+        try:
+            # Try converting the input to float
+            input_val = float(input_text)
+            # Check if the input value is within the range
+            if self._val_min <= input_val <= self._val_max:
+                self.setValue(input_val)
+            else:
+                # Reset the input text if it's out of range
+                self.input_value.setText(str(self._val_main))
+        except ValueError:
+            # Reset the input text if it's not a valid float
+            self.input_value.setText(str(self._val_main))
+
     def value(self) -> float:
         """Returns value of slider."""
         return self._val_main
@@ -250,6 +273,9 @@ def setValue(self, val: float) -> float:
         x = self._toPos(val)
         self.handle.setPos(x, 0)
         self.ensureVisible(x, 0, self._handle_width, 0, 3, 0)
+        if hasattr(self, 'input_value'):
+            # Update input text value with slider's current value
+            self.input_value.setText(str(self._val_main))
 
     def setMinimum(self, min: float) -> float:
         """Sets minimum value for slider."""
@@ -1064,6 +1090,9 @@ def done(x, y):
         self.mouseMoved.emit(scenePos.x(), scenePos.y())
         self.mousePressed.emit(scenePos.x(), scenePos.y())
 
+        # Update input text value with slider's current value
+        self.input_value.setText(str(self._val_main))
+
     def mouseMoveEvent(self, event):
         """Override method to emit mouseMoved signal on drag."""
         scenePos = self.mapToScene(event.pos())