avoid repeatedly update ui (#3)

- Attribute forms are opened smoother and faster
- Should be checked in QGIS if some updateUi calls could be avoided

ordered_relation_editor/core/ordered_relation_model.py

@@ -161,7 +161,8 @@ def reloadData(self):
         self._related_features = []
 
         if Debug:
-            print('Debug', self._ordering_field, self._relation.isValid(), self._relation.id(), self._feature.isValid())
+            QgsMessageLog.logMessage("Reload data: Ordering field='{0}', Relation valid/id={1}/'{2}', Feature valid={3}"
+                                      .format(self._ordering_field, self._relation.isValid(), self._relation.id(), self._feature.isValid()))
 
         if len(self._ordering_field) > 0 and self._relation.isValid() and self._feature.isValid():
             request = self._relation.getRelatedFeaturesRequest(self._feature)

ordered_relation_editor/gui/ordered_relation_editor_widget.py

@@ -10,10 +10,10 @@
 
 from PyQt5.QtQuickWidgets import QQuickWidget
 import os
-from qgis.PyQt.QtCore import QUrl, QModelIndex
+from qgis.PyQt.QtCore import QUrl, QModelIndex, QTimer
 from qgis.PyQt.QtWidgets import QVBoxLayout
 from qgis.PyQt.uic import loadUiType
-from qgis.core import QgsFeature, QgsApplication
+from qgis.core import QgsFeature, QgsApplication, QgsMessageLog
 from qgis.gui import QgsAbstractRelationEditorWidget, QgsAttributeForm, QgsScrollArea
 from ordered_relation_editor.core.ordered_relation_model import OrderedRelationModel
 
@@ -25,6 +25,9 @@ class OrderedRelationEditorWidget(QgsAbstractRelationEditorWidget, WidgetUi):
 
     def __init__(self, config, parent):
         super().__init__(config, parent)
+        self.updateUiTimer = QTimer()
+        self.updateUiTimer.setSingleShot(True)
+        self.updateUiTimer.timeout.connect(self.updateUiTimeout)
         self.setupUi(self)
         self.addFeatureToolButton.setIcon(QgsApplication.getThemeIcon('/mActionNewTableRow.svg'))
         self.addFeatureToolButton.clicked.connect(self.addFeature)
@@ -81,7 +84,12 @@ def update_buttons(self):
         self.deleteFeatureToolButton.setEnabled(enabled and view_has_selection)
 
     def updateUi(self):
-        # print('updateUi')
+        self.updateUiTimer.start(200)
+
+    def updateUiTimeout(self):
+        if Debug:
+            QgsMessageLog.logMessage("updateUiTimeout()")
+
         self.model.init(self.relation(), self.ordering_field, self.feature(), self.image_path, self.description)
 
         # form view