Added combobox to the main view for displaying unique labels individually

combobox.py

@@ -0,0 +1,25 @@
+import sys
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
+from PyQt5.QtWidgets import *
+
+
+class ComboBox(QWidget):
+    def __init__(self, parent=None, items=[]):
+        super(ComboBox, self).__init__(parent)
+
+        layout = QHBoxLayout()
+        self.cb = QComboBox()
+        self.items = items
+        self.cb.addItems(self.items)
+        
+        self.cb.currentIndexChanged.connect(parent.comboSelectionChanged)
+            
+        layout.addWidget(self.cb)
+        self.setLayout(layout)
+        
+    def update_items(self, items):
+        self.items = items
+
+        self.cb.clear()
+        self.cb.addItems(self.items)

labelImg.py

@@ -26,6 +26,7 @@ except ImportError:
     from PyQt4.QtGui import *
     from PyQt4.QtCore import *
 
+from combobox import ComboBox
 from libs.resources import *
 from libs.constants import *
 from libs.utils import *
@@ -136,6 +137,10 @@ class MainWindow(QMainWindow, WindowMixin):
         listLayout.addWidget(self.diffcButton)
         listLayout.addWidget(useDefaultLabelContainer)
 
+        # Create and add combobox for showing unique labels in group 
+        self.comboBox = ComboBox(self)
+        listLayout.addWidget(self.comboBox)
+
         # Create and add a widget for showing current label items
         self.labelList = QListWidget()
         labelListContainer = QWidget()
@@ -147,6 +152,8 @@ class MainWindow(QMainWindow, WindowMixin):
         self.labelList.itemChanged.connect(self.labelItemChanged)
         listLayout.addWidget(self.labelList)
 
+        
+
         self.dock = QDockWidget(getStr('boxLabelText'), self)
         self.dock.setObjectName(getStr('labels'))
         self.dock.setWidget(labelListContainer)
@@ -573,6 +580,7 @@ class MainWindow(QMainWindow, WindowMixin):
         self.labelFile = None
         self.canvas.resetState()
         self.labelCoordinates.clear()
+        self.comboBox.cb.clear()
 
     def currentItem(self):
         items = self.labelList.selectedItems()
@@ -670,6 +678,7 @@ class MainWindow(QMainWindow, WindowMixin):
             item.setText(text)
             item.setBackground(generateColorByText(text))
             self.setDirty()
+            self.updateComboBox()
 
     # Tzutalin 20160906 : Add file list and dock to move faster
     def fileitemDoubleClicked(self, item=None):
@@ -733,6 +742,7 @@ class MainWindow(QMainWindow, WindowMixin):
         self.labelList.addItem(item)
         for action in self.actions.onShapesPresent:
             action.setEnabled(True)
+        self.updateComboBox()
 
     def remLabel(self, shape):
         if shape is None:
@@ -742,6 +752,7 @@ class MainWindow(QMainWindow, WindowMixin):
         self.labelList.takeItem(self.labelList.row(item))
         del self.shapesToItems[shape]
         del self.itemsToShapes[item]
+        self.updateComboBox()
 
     def loadLabels(self, shapes):
         s = []
@@ -770,9 +781,20 @@ class MainWindow(QMainWindow, WindowMixin):
                 shape.fill_color = generateColorByText(label)
 
             self.addLabel(shape)
-
+        self.updateComboBox()
         self.canvas.loadShapes(s)
 
+    def updateComboBox(self):
+        # Get the unique labels and add them to the Combobox.
+        itemsTextList = [str(self.labelList.item(i).text()) for i in range(self.labelList.count())]
+            
+        uniqueTextList = list(set(itemsTextList))
+        # Add a null row for showing all the labels
+        uniqueTextList.append("")
+        uniqueTextList.sort()
+
+        self.comboBox.update_items(uniqueTextList)
+
     def saveLabels(self, annotationFilePath):
         annotationFilePath = ustr(annotationFilePath)
         if self.labelFile is None:
@@ -813,6 +835,16 @@ class MainWindow(QMainWindow, WindowMixin):
         self.addLabel(self.canvas.copySelectedShape())
         # fix copy and delete
         self.shapeSelectionChanged(True)
+    
+    def comboSelectionChanged(self, index):
+        text = self.comboBox.cb.itemText(index)
+        for i in range(self.labelList.count()):
+            if text == "":
+                self.labelList.item(i).setCheckState(2) 
+            elif text != self.labelList.item(i).text():
+                self.labelList.item(i).setCheckState(0)
+            else:
+                self.labelList.item(i).setCheckState(2)
 
     def labelSelectionChanged(self):
         item = self.currentItem()