Fix: No preview detection, while full detection is running

This messes up the progress bar....
Also: more complete blockUI and unblockUI

detectionview.py

@@ -291,6 +291,7 @@ class ParticleDetectionView(QtWidgets.QWidget):
         self.seg = Segmentation(self.dataset, self)
         self.seg.detectionState.connect(self.updateDetectionState)
         self.thread = None
+        self.threadrunning = False
         self.view = parent
         
         vbox = QtWidgets.QVBoxLayout()
@@ -315,7 +316,7 @@ class ParticleDetectionView(QtWidgets.QWidget):
         self.showseedpoints.setChecked(True)
         self.setImageCenter()
         
-        group = QtWidgets.QGroupBox("Detection settings", self)
+        self.detectParamsGroup = QtWidgets.QGroupBox("Detection settings", self)
         grid = QtWidgets.QGridLayout()
         self.parameters = []
         checkBoxesToLink = {}
@@ -397,8 +398,8 @@ class ParticleDetectionView(QtWidgets.QWidget):
         grid.addWidget(self.showseedpoints, i+2, 0, 1, 2, QtCore.Qt.AlignLeft) 
         grid.addWidget(QtWidgets.QLabel("Click mouse to add seeds, Click+Shift to add deletepoints"), i+3, 0, 1, 2, QtCore.Qt.AlignLeft) 
         grid.addWidget(QtWidgets.QLabel("Click+Alt removes seeds near cursor"), i+4, 0, 1, 2, QtCore.Qt.AlignLeft) 
-        group.setLayout(grid)
-        vbox.addWidget(group)
+        self.detectParamsGroup.setLayout(grid)
+        vbox.addWidget(self.detectParamsGroup)
         
         self.updateSeedsInSampleViewBtn = QtWidgets.QPushButton("Update Seedpoints in fullimage view", self)
         self.updateSeedsInSampleViewBtn.released.connect(self.updateSeedsInSampleview)
@@ -600,6 +601,7 @@ class ParticleDetectionView(QtWidgets.QWidget):
         self.updateImageSeeds()
         
     def detectShow(self, showname):
+        if not self.threadrunning:
             self.saveDetectParams(self.dataset)
             img = self.subimg.copy()
             kwargs = {}
@@ -637,10 +639,16 @@ class ParticleDetectionView(QtWidgets.QWidget):
     def blockUI(self):
         self.pdetectsub.setEnabled(False)
         self.pclear.setEnabled(False)
+        self.detectParamsGroup.setEnabled(False)
+        self.updateSeedsInSampleViewBtn.setEnabled(False)
+        self.hideSeedsInSampleViewBtn.setEnabled(False)
     
     def unBlockUI(self):
         self.pdetectsub.setEnabled(True)
         self.pclear.setEnabled(True)
+        self.detectParamsGroup.setEnabled(True)
+        self.updateSeedsInSampleViewBtn.setEnabled(True)
+        self.hideSeedsInSampleViewBtn.setEnabled(True)
     
     def raiseWarning(self, warning):
         QtWidgets.QMessageBox.critical(self, "Warning", warning)