Timestamp measurements as early as possible.

[sigrok-meter.git] / datamodel.py

diff --git a/datamodel.py b/datamodel.py
index 52884eb6de29e4f049a633234e28e68a720e6d8d..6ce91581bbed334e51d3ba2feda120af8a0eaa3d 100644 (file)
--- a/datamodel.py
+++ b/datamodel.py
@@ -22,7 +22,6 @@ import collections
 import itertools
 import qtcompat
 import sigrok.core as sr
-import time
 import util
 
 try:
@@ -33,6 +32,17 @@ except ImportError:
 QtCore = qtcompat.QtCore
 QtGui = qtcompat.QtGui
 
+class Trace(object):
+    '''Class to hold the measured samples.'''
+
+    def __init__(self):
+        self.samples = []
+        self.new = False
+
+    def append(self, sample):
+        self.samples.append(sample)
+        self.new = True
+
 class MeasurementDataModel(QtGui.QStandardItemModel):
     '''Model to hold the measured values.'''
 
@@ -42,8 +52,8 @@ class MeasurementDataModel(QtGui.QStandardItemModel):
     '''Role used to store the device vendor and model.'''
     descRole = QtCore.Qt.UserRole + 2
 
-    '''Role used to store past samples.'''
-    samplesRole = QtCore.Qt.UserRole + 3
+    '''Role used to store a dictionary with the traces'''
+    tracesRole = QtCore.Qt.UserRole + 3
 
     '''Role used to store the color to draw the graph of the channel.'''
     colorRole = QtCore.Qt.UserRole + 4
@@ -126,14 +136,14 @@ class MeasurementDataModel(QtGui.QStandardItemModel):
         item = QtGui.QStandardItem()
         item.setData(uid, MeasurementDataModel.idRole)
         item.setData(desc, MeasurementDataModel.descRole)
-        item.setData(collections.defaultdict(list), MeasurementDataModel.samplesRole)
+        item.setData(collections.defaultdict(Trace), MeasurementDataModel.tracesRole)
         item.setData(next(self._colorgen), MeasurementDataModel.colorRole)
         self.appendRow(item)
         self.sort(0)
         return item
 
-    @QtCore.Slot(object, object, object)
-    def update(self, device, channel, data):
+    @QtCore.Slot(float, sr.classes.Device, sr.classes.Channel, tuple)
+    def update(self, timestamp, device, channel, data):
         '''Update the data for the device (+channel) with the most recent
         measurement from the given payload.'''
 
@@ -150,9 +160,9 @@ class MeasurementDataModel(QtGui.QStandardItemModel):
 
         # The samples role is a dictionary that contains the old samples for each unit.
         # Should be trimmed periodically, otherwise it grows larger and larger.
-        sample = (time.time(), value)
-        d = item.data(MeasurementDataModel.samplesRole)
-        d[unit].append(sample)
+        sample = (timestamp, value)
+        traces = item.data(MeasurementDataModel.tracesRole)
+        traces[unit].append(sample)
 
 class MultimeterDelegate(QtGui.QStyledItemDelegate):
     '''Delegate to show the data items from a MeasurementDataModel.'''