Add combobox to update layers

Author: dstansby

src/napari_matplotlib/_widget.py

@@ -1,17 +1,26 @@
 import napari
 from matplotlib.backends.backend_qt5agg import FigureCanvas
 from matplotlib.figure import Figure
-from qtpy.QtWidgets import QHBoxLayout, QWidget
+from qtpy.QtWidgets import QComboBox, QVBoxLayout, QWidget
 
 
 class ExampleQWidget(QWidget):
     def __init__(self, napari_viewer: napari.viewer.Viewer):
         super().__init__()
         self.viewer = napari_viewer
 
-        self.setLayout(QHBoxLayout())
+        self.setLayout(QVBoxLayout())
 
         static_canvas = FigureCanvas(Figure(figsize=(5, 3)))
-        axes = static_canvas.figure.subplots()
+        self.axes = static_canvas.figure.subplots()
 
+        self.layer_box = QComboBox()
+        self.layout().addWidget(self.layer_box)
         self.layout().addWidget(static_canvas)
+
+        self.update_layers()
+
+    def update_layers(self):
+        self.layer_box.clear()
+        names = [layer.name for layer in self.viewer.layers]
+        self.layer_box.insertItems(0, names)

test.py

@@ -1,6 +1,7 @@
 import napari
 
 viewer = napari.Viewer()
+viewer.open_sample("napari", "brain")
 viewer.window.add_plugin_dock_widget(
     plugin_name="napari-matplotlib", widget_name="Matplotlib"
 )