visibility of legend box synched with plotwidget visibility

Author: abmajith

examples/plotLegendLists.py

@@ -17,8 +17,7 @@
 
 plot = Plot2D()
 plot_layout.addWidget(plot)
-info_widget = LegendItemList()
-info_widget.binding(plot)
+info_widget = LegendItemList(parent=plot)
 
 # --- Curve Demonstration ---
 x_curve = numpy.linspace(0, 10, 100)
@@ -46,14 +45,6 @@
 plot.addItem(curve2)
 
 
-# Add a custom button to highlight a curve to demonstrate the signal handling
-def highlight_curve1():
-    curve1.setHighlighted(not curve1.isHighlighted())
-
-
-highlight_button = qt.QPushButton("Toggle Highlight on Sinusoidal Curve")
-plot_layout.addWidget(highlight_button)
 plot.resetZoom()
 plot_window.show()
-info_widget.show()
 app.exec_()

src/silx/gui/plot/LegendItem.py

@@ -99,6 +99,8 @@ def __init__(self, parent, item: items):
         self._item = item
         self._itemRef = weakref.ref(item)
         self.setLayout(qt.QHBoxLayout())
+        self.setFixedWidth(200)
+        self.layout().setSpacing(20)
         self.layout().setContentsMargins(10, 0, 10, 0)
         item.sigItemChanged.connect(self._itemChanged)
 
@@ -161,18 +163,24 @@ def _onLabelClicked(self, event):
                 self._item.setVisible(not self._item.isVisible())
 
 
-class LegendItemList(qt.QMainWindow):
-    def __init__(self, parent=None):
+class LegendItemList(qt.QWidget):
+    def __init__(self, parent: PlotWidget):
         super().__init__(parent, qt.Qt.Window)
-        self.setWindowTitle("Plot Info")
-        self.resize(300, 150)
-        self.central_widget = qt.QWidget()
-        self.setCentralWidget(self.central_widget)
-        self._layout = qt.QVBoxLayout(self.central_widget)
+        self.setFixedWidth(200)
+        self._layout = qt.QVBoxLayout(self)
         self._plot: PlotWidget | None = None
+        self._binding(parent)
+        if hasattr(parent, "sigVisibilityChanged"):
+            parent.sigVisibilityChanged.connect(self._setVisibility)
 
-    def binding(self, plotWidget: PlotWidget):
-        """Binds this widget to the signals of a PlotWidget."""
+    def _setVisibility(self, status: bool) -> None:
+        if status:
+            self.show()
+        else:
+            self.hide()
+
+    def _binding(self, plotWidget: PlotWidget):
+        """Binds this widget to the signals of a parent PlotWidget."""
         self._plot = plotWidget
         self._plot.sigActiveCurveChanged.connect(self._onActiveItemChanged)
         self._plot.sigActiveImageChanged.connect(self._onActiveItemChanged)
@@ -200,6 +208,17 @@ def _updateAllItemsList(self):
             _legendIcon = LegendItemWidget(None, item)
             self._layout.addWidget(_legendIcon)
 
+        self._updateHeigth()
+
+    def _updateHeigth(self):
+        _totalHeight = (self._layout.count() - 1) * self._layout.spacing()
+        _totalHeight += self._layout.contentsMargins().top()
+        _totalHeight += self._layout.contentsMargins().bottom()
+        if self._layout.count() > 0:
+            item = self._layout.itemAt(0)
+            _totalHeight += item.widget().sizeHint().height() * self._layout.count()
+        self.setFixedHeight(_totalHeight)
+
     def _onActiveItemChanged(self, previous, current):
         self._updateAllItemsList()