Merge pull request #837 from scseeman/color_map_widget_options

add option to set other field variables in ColorMapWidget

pyqtgraph/widgets/ColorMapWidget.py

@@ -60,11 +60,21 @@ class ColorMapParameter(ptree.types.GroupParameter):
         self.sigColorMapChanged.emit(self)
         
     def addNew(self, name):
-        mode = self.fields[name].get('mode', 'range')
+        fieldSpec = self.fields[name]
+        
+        mode = fieldSpec.get('mode', 'range')        
         if mode == 'range':
             item = RangeColorMapItem(name, self.fields[name])
         elif mode == 'enum':
             item = EnumColorMapItem(name, self.fields[name])
+
+        defaults = fieldSpec.get('defaults', {})
+        for k, v in defaults.items():
+            if k == 'colormap':
+                item.setValue(v)
+            else:
+                item[k] = v
+
         self.addChild(item)
         return item
         
@@ -90,6 +100,11 @@ class ColorMapParameter(ptree.types.GroupParameter):
         values         List of unique values for which the user may assign a 
                        color when mode=='enum'. Optionally may specify a dict 
                        instead {value: name}.
+        defaults       Dict of default values to apply to color map items when
+                       they are created. Valid keys are 'colormap' to provide
+                       a default color map, or otherwise they a string or tuple
+                       indicating the parameter to be set, such as 'Operation' or
+                       ('Channels..', 'Red').
         ============== ============================================================
         """
         self.fields = OrderedDict(fields)
@@ -138,7 +153,6 @@ class ColorMapParameter(ptree.types.GroupParameter):
             elif op == 'Set':
                 colors[mask] = colors2[mask]            
                 
-                
         colors = np.clip(colors, 0, 1)
         if mode == 'byte':
             colors = (colors * 255).astype(np.ubyte)