From 684882455773f410e07c0dd16977e5696edaf6ce Mon Sep 17 00:00:00 2001
From: Jan Kotanski <jan.kotanski@desy.de>
Date: Sun, 3 Nov 2019 06:00:06 +0100
Subject: [PATCH] add bookkeeping exporter parameters (#1023)

---
 pyqtgraph/GraphicsScene/exportDialog.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/pyqtgraph/GraphicsScene/exportDialog.py b/pyqtgraph/GraphicsScene/exportDialog.py
index 8085c5bf..045698fe 100644
--- a/pyqtgraph/GraphicsScene/exportDialog.py
+++ b/pyqtgraph/GraphicsScene/exportDialog.py
@@ -23,6 +23,8 @@ class ExportDialog(QtGui.QWidget):
         self.currentExporter = None
         self.scene = scene
             
+        self.exporterParameters = {}
+
         self.selectBox = QtGui.QGraphicsRectItem()
         self.selectBox.setPen(fn.mkPen('y', width=3, style=QtCore.Qt.DashLine))
         self.selectBox.hide()
@@ -121,7 +123,18 @@ class ExportDialog(QtGui.QWidget):
             return
         expClass = self.exporterClasses[str(item.text())]
         exp = expClass(item=self.ui.itemTree.currentItem().gitem)
-        params = exp.parameters()
+
+        if prev:
+            oldtext = str(prev.text())
+            self.exporterParameters[oldtext] = self.currentExporter.parameters()
+        newtext = str(item.text())
+        if newtext in self.exporterParameters.keys():
+            params = self.exporterParameters[newtext]
+            exp.params = params
+        else:
+            params = exp.parameters()
+            self.exporterParameters[newtext] = params
+
         if params is None:
             self.ui.paramTree.clear()
         else: