[timeline] new widget for timeline navigation

fixtracks/widgets/timeline.py

@@ -0,0 +1,93 @@
+import logging
+import pathlib
+from PySide6.QtCore import Qt
+from PySide6.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QLabel, QSlider, QSpinBox
+
+from fixtracks.utils.signals import TimelineSignals
+
+class Timeline(QWidget):
+    signals = TimelineSignals()
+
+    def __init__(self, start=0, stop=100, parent=None):
+        super().__init__(parent)
+        self._width = stop//10
+        self._slider = QSlider(Qt.Orientation.Horizontal)
+        self._slider.setRange(start, stop)
+        self._slider.setTickInterval(int(stop // 10))
+        self._slider.sliderReleased.connect(self._on_sliderReleased)
+        self._slider.valueChanged.connect(self._on_sliderChanged)
+
+        self._widthspinner = QSpinBox()
+        self._widthspinner.setRange(0, int(stop // 10))
+        self._widthspinner.setSingleStep(int(stop // 100))
+        self._positionLabel = QLabel("")
+        font = self._positionLabel.font()
+        font.setPointSize(9)
+        self._positionLabel.setFont(font)
+        self._startlabel = QLabel("0")
+        self._startlabel.setFont(font)
+        self._stoplabel = QLabel(str(stop))
+        self._stoplabel.setFont(font)
+
+        messagelabel = QLabel("current position:")
+        messagelabel.setFont(font)
+
+        messagebox = QHBoxLayout()
+        messagebox.addWidget(self._startlabel)
+        messagebox.addWidget(messagelabel)
+        messagebox.addWidget(self._positionLabel)
+        messagebox.addWidget(self._stoplabel)
+
+        sliderbox = QHBoxLayout()
+        sliderbox.addWidget(self._startlabel)
+        sliderbox.addWidget(self._slider)
+        sliderbox.addWidget(self._stoplabel)
+
+        lyt= QVBoxLayout()
+        lyt.addLayout(sliderbox)
+        lyt.addLayout(messagebox)
+        self.setLayout(lyt)
+
+    def setRange(self, stop, width):
+        self._slider.setRange(0, stop)
+        self._width = width
+        self._stoplabel.setText(str(stop))
+        self._slider.setSliderPosition(int(stop // 2))
+
+    def setWindowWidth(self, newsize):
+        self._width = newsize
+        if self._slider.value() < newsize // 2:
+            self._slider.setSliderPosition(int(newsize // 2))
+        elif self.sliderPosition > self._slider.maximum() - self._width //2:
+            self._slider.setSliderPosition(self._slider.maximum() - self._width //2)
+
+    def _on_sliderReleased(self):
+        value = self._slider.value()
+        if value < self._width //2:
+            self._slider.setSliderPosition(self._width //2)
+        elif value > self._slider.maximum() - self._width //2:
+            self._slider.setSliderPosition(self._slider.maximum() - self._width //2)
+        self.signals.changed.emit(self._slider.sliderPosition())
+
+    def _on_sliderChanged(self, value):
+        self._positionLabel.setText(str(self._slider.value()))
+
+    @property
+    def sliderPosition(self):
+        return self._slider.value()
+
+def main():
+    from PySide6.QtWidgets import QApplication
+
+    app = QApplication([])
+    window = QWidget()
+    window.setMinimumSize(200, 50)
+    layout = QVBoxLayout()
+    timeline = Timeline(0, 100)
+    layout.addWidget(timeline)
+    window.setLayout(layout)
+    window.show()
+    app.exec()
+
+if __name__ == "__main__":
+    main()