added check for correct python version

fixes for flowchart
 - added missing FeedbackButton.py
 - corrected imports

__init__.py

@@ -13,6 +13,11 @@ from Qt import QtGui
 ## we only enable it where the performance benefit is critical.
 ## Note this only applies to 2D graphics; 3D graphics always use OpenGL.
 import sys
+
+## check python version
+if sys.version_info[0] != 2 or sys.version_info[1] != 7:
+    raise Exception("Pyqtgraph requires Python version 2.7 (this is %d.%d)" % (sys.version_info[0], sys.version_info[1]))
+
 if 'linux' in sys.platform:  ## linux has numerous bugs in opengl implementation
     useOpenGL = False
 elif 'darwin' in sys.platform: ## openGL greatly speeds up display on mac

examples/Flowchart.py

@@ -24,10 +24,10 @@ w = fc.widget()
 w.resize(400,200)
 w.show()
 
-n1 = fc.createNode('Add')
-n2 = fc.createNode('Subtract')
-n3 = fc.createNode('Abs')
-n4 = fc.createNode('Add')
+n1 = fc.createNode('Add', pos=(0,-80))
+n2 = fc.createNode('Subtract', pos=(140,-10))
+n3 = fc.createNode('Abs', pos=(0, 80))
+n4 = fc.createNode('Add', pos=(140,100))
 
 fc.connectTerminals(fc.dataIn, n1.A)
 fc.connectTerminals(fc.dataIn, n1.B)

flowchart/FlowchartCtrlTemplate.py

@@ -67,5 +67,5 @@ class Ui_Form(object):
         self.reloadBtn.setText(QtGui.QApplication.translate("Form", "Reload Libs", None, QtGui.QApplication.UnicodeUTF8))
         self.showChartBtn.setText(QtGui.QApplication.translate("Form", "Flowchart", None, QtGui.QApplication.UnicodeUTF8))
 
-from FeedbackButton import FeedbackButton
+from pyqtgraph.widgets.FeedbackButton import FeedbackButton
 from pyqtgraph.widgets.TreeWidget import TreeWidget

flowchart/FlowchartCtrlTemplate.ui

@@ -112,7 +112,7 @@
   <customwidget>
    <class>FeedbackButton</class>
    <extends>QPushButton</extends>
-   <header>FeedbackButton</header>
+   <header>pyqtgraph.widgets.FeedbackButton</header>
   </customwidget>
  </customwidgets>
  <resources/>

widgets/FeedbackButton.py

@@ -0,0 +1,160 @@
+# -*- coding: utf-8 -*-
+from pyqtgraph.Qt import QtCore, QtGui
+class FeedbackButton(QtGui.QPushButton):
+    """
+    QPushButton which flashes success/failure indication for slow or asynchronous procedures.
+    """
+    
+    
+    ### For thread-safetyness
+    sigCallSuccess = QtCore.Signal(object, object, object)
+    sigCallFailure = QtCore.Signal(object, object, object)
+    sigCallProcess = QtCore.Signal(object, object, object)
+    sigReset = QtCore.Signal()
+    
+    def __init__(self, *args):
+        QtGui.QPushButton.__init__(self, *args)
+        self.origStyle = None
+        self.origText = self.text()
+        self.origStyle = self.styleSheet()
+        self.origTip = self.toolTip()
+        self.limitedTime = True
+        
+        
+        #self.textTimer = QtCore.QTimer()
+        #self.tipTimer = QtCore.QTimer()
+        #self.textTimer.timeout.connect(self.setText)
+        #self.tipTimer.timeout.connect(self.setToolTip)
+        
+        self.sigCallSuccess.connect(self.success)
+        self.sigCallFailure.connect(self.failure)
+        self.sigCallProcess.connect(self.processing)
+        self.sigReset.connect(self.reset)
+        
+
+    def feedback(self, success, message=None, tip="", limitedTime=True):
+        """Calls success() or failure(). If you want the message to be displayed until the user takes an action, set limitedTime to False. Then call self.reset() after the desired action.Threadsafe."""
+        if success:
+            self.success(message, tip, limitedTime=limitedTime)
+        else:
+            self.failure(message, tip, limitedTime=limitedTime)
+    
+    def success(self, message=None, tip="", limitedTime=True):
+        """Displays specified message on button and flashes button green to let user know action was successful. If you want the success to be displayed until the user takes an action, set limitedTime to False. Then call self.reset() after the desired action. Threadsafe."""
+        isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
+        if isGuiThread:
+            self.setEnabled(True)
+            #print "success"
+            self.startBlink("#0F0", message, tip, limitedTime=limitedTime)
+        else:
+            self.sigCallSuccess.emit(message, tip, limitedTime)
+            
+    def failure(self, message=None, tip="", limitedTime=True):
+        """Displays specified message on button and flashes button red to let user know there was an error. If you want the error to be displayed until the user takes an action, set limitedTime to False. Then call self.reset() after the desired action. Threadsafe. """
+        isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
+        if isGuiThread:
+            self.setEnabled(True)
+            #print "fail"
+            self.startBlink("#F00", message, tip, limitedTime=limitedTime)
+        else:
+            self.sigCallFailure.emit(message, tip, limitedTime)
+
+    def processing(self, message="Processing..", tip="", processEvents=True):
+        """Displays specified message on button to let user know the action is in progress. Threadsafe. """
+        isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
+        if isGuiThread:
+            self.setEnabled(False)
+            self.setText(message, temporary=True)
+            self.setToolTip(tip, temporary=True)
+            if processEvents:
+                QtGui.QApplication.processEvents()
+        else:
+            self.sigCallProcess.emit(message, tip, processEvents)
+           
+                
+    def reset(self):
+        """Resets the button to its original text and style. Threadsafe."""
+        isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
+        if isGuiThread:
+            self.limitedTime = True
+            self.setText()
+            self.setToolTip()
+            self.setStyleSheet()
+        else:
+            self.sigReset.emit()
+        
+    def startBlink(self, color, message=None, tip="", limitedTime=True):
+        #if self.origStyle is None:
+            #self.origStyle = self.styleSheet()
+            #self.origText = self.text()
+        self.setFixedHeight(self.height())
+        
+        if message is not None:
+            self.setText(message, temporary=True)
+        self.setToolTip(tip, temporary=True)
+        self.count = 0
+        #self.indStyle = "QPushButton {border: 2px solid %s; border-radius: 5px}" % color
+        self.indStyle = "QPushButton {background-color: %s}" % color
+        self.limitedTime = limitedTime
+        self.borderOn()
+        if limitedTime:
+            QtCore.QTimer.singleShot(2000, self.setText)
+            QtCore.QTimer.singleShot(10000, self.setToolTip)
+
+    def borderOn(self):
+        self.setStyleSheet(self.indStyle, temporary=True)
+        if self.limitedTime or self.count <=2:
+            QtCore.QTimer.singleShot(100, self.borderOff)
+        
+            
+    def borderOff(self):
+        self.setStyleSheet()
+        self.count += 1
+        if self.count >= 2:
+            if self.limitedTime:
+                return
+        QtCore.QTimer.singleShot(30, self.borderOn)
+        
+            
+    def setText(self, text=None, temporary=False):
+        if text is None:
+            text = self.origText
+        #print text
+        QtGui.QPushButton.setText(self, text)
+        if not temporary:
+            self.origText = text
+
+    def setToolTip(self, text=None, temporary=False):
+        if text is None:
+            text = self.origTip
+        QtGui.QPushButton.setToolTip(self, text)
+        if not temporary:
+            self.origTip = text
+
+    def setStyleSheet(self, style=None, temporary=False):
+        if style is None:
+            style = self.origStyle
+        QtGui.QPushButton.setStyleSheet(self, style)
+        if not temporary:
+            self.origStyle = style
+
+
+if __name__ == '__main__':
+    import time
+    app = QtGui.QApplication([])
+    win = QtGui.QMainWindow()
+    btn = FeedbackButton("Button")
+    fail = True
+    def click():
+        btn.processing("Hold on..")
+        time.sleep(2.0)
+        
+        global fail
+        fail = not fail
+        if fail:
+            btn.failure(message="FAIL.", tip="There was a failure. Get over it.")
+        else:
+            btn.success(message="Bueno!")
+    btn.clicked.connect(click)
+    win.setCentralWidget(btn)
+    win.show()