Added unit tests checking infiniteline interactivity

pyqtgraph/GraphicsScene/GraphicsScene.py

@@ -98,6 +98,7 @@ class GraphicsScene(QtGui.QGraphicsScene):
         self.lastDrag = None
         self.hoverItems = weakref.WeakKeyDictionary()
         self.lastHoverEvent = None
+        self.minDragTime = 0.5  # drags shorter than 0.5 sec are interpreted as clicks
         
         self.contextMenu = [QtGui.QAction("Export...", self)]
         self.contextMenu[0].triggered.connect(self.showExportDialog)
@@ -173,7 +174,7 @@ class GraphicsScene(QtGui.QGraphicsScene):
                     if int(btn) not in self.dragButtons:  ## see if we've dragged far enough yet
                         cev = [e for e in self.clickEvents if int(e.button()) == int(btn)][0]
                         dist = Point(ev.screenPos() - cev.screenPos())
-                        if dist.length() < self._moveDistance and now - cev.time() < 0.5:
+                        if dist.length() < self._moveDistance and now - cev.time() < self.minDragTime:
                             continue
                         init = init or (len(self.dragButtons) == 0)  ## If this is the first button to be dragged, then init=True
                         self.dragButtons.append(int(btn))
@@ -186,10 +187,8 @@ class GraphicsScene(QtGui.QGraphicsScene):
     def leaveEvent(self, ev):  ## inform items that mouse is gone
         if len(self.dragButtons) == 0:
             self.sendHoverEvents(ev, exitOnly=True)
-        
                 
     def mouseReleaseEvent(self, ev):
-        #print 'sceneRelease'
         if self.mouseGrabberItem() is None:
             if ev.button() in self.dragButtons:
                 if self.sendDragEvent(ev, final=True):

pyqtgraph/graphicsItems/tests/test_InfiniteLine.py

@@ -0,0 +1,41 @@
+import pyqtgraph as pg
+from pyqtgraph.Qt import QtTest, QtGui, QtCore
+from pyqtgraph.tests import mouseDrag
+pg.mkQApp()
+
+qWait = QtTest.QTest.qWait
+
+
+def test_mouseInteraction():
+    plt = pg.plot()
+    plt.scene().minDragTime = 0  # let us simulate mouse drags very quickly.
+    vline = plt.addLine(x=0, movable=True)
+    plt.addItem(vline)
+    hline = plt.addLine(y=0, movable=True)
+    plt.setXRange(-10, 10)
+    plt.setYRange(-10, 10)
+    
+    # test horizontal drag
+    pos = plt.plotItem.vb.mapViewToScene(pg.Point(0,5)).toPoint()
+    pos2 = pos - QtCore.QPoint(200, 200)
+    mouseDrag(plt, pos, pos2, QtCore.Qt.LeftButton)
+    px = vline.pixelLength(pg.Point(1, 0), ortho=True)
+    assert abs(vline.value() - plt.plotItem.vb.mapSceneToView(pos2).x()) <= px
+
+    # test missed drag
+    pos = plt.plotItem.vb.mapViewToScene(pg.Point(5,0)).toPoint()
+    pos = pos + QtCore.QPoint(0, 6)
+    pos2 = pos + QtCore.QPoint(-20, -20)
+    mouseDrag(plt, pos, pos2, QtCore.Qt.LeftButton)
+    assert hline.value() == 0
+
+    # test vertical drag
+    pos = plt.plotItem.vb.mapViewToScene(pg.Point(5,0)).toPoint()
+    pos2 = pos - QtCore.QPoint(50, 50)
+    mouseDrag(plt, pos, pos2, QtCore.Qt.LeftButton)
+    px = hline.pixelLength(pg.Point(1, 0), ortho=True)
+    assert abs(hline.value() - plt.plotItem.vb.mapSceneToView(pos2).y()) <= px
+
+
+if __name__ == '__main__':
+    test_mouseInteraction()

pyqtgraph/tests/__init__.py

@@ -0,0 +1 @@
+from .ui_testing import mousePress, mouseMove, mouseRelease, mouseDrag, mouseClick

pyqtgraph/tests/ui_testing.py

@@ -0,0 +1,55 @@
+
+# Functions for generating user input events. 
+# We would like to use QTest for this purpose, but it seems to be broken.
+# See: http://stackoverflow.com/questions/16299779/qt-qgraphicsview-unit-testing-how-to-keep-the-mouse-in-a-pressed-state
+
+from ..Qt import QtCore, QtGui, QT_LIB
+
+
+def mousePress(widget, pos, button, modifier=None):
+    if isinstance(widget, QtGui.QGraphicsView):
+        widget = widget.viewport()
+    if modifier is None:
+        modifier = QtCore.Qt.NoModifier
+    if QT_LIB != 'PyQt5' and isinstance(pos, QtCore.QPointF):
+        pos = pos.toPoint()
+    event = QtGui.QMouseEvent(QtCore.QEvent.MouseButtonPress, pos, button, QtCore.Qt.NoButton, modifier)
+    QtGui.QApplication.sendEvent(widget, event)
+
+
+def mouseRelease(widget, pos, button, modifier=None):
+    if isinstance(widget, QtGui.QGraphicsView):
+        widget = widget.viewport()
+    if modifier is None:
+        modifier = QtCore.Qt.NoModifier
+    if QT_LIB != 'PyQt5' and isinstance(pos, QtCore.QPointF):
+        pos = pos.toPoint()
+    event = QtGui.QMouseEvent(QtCore.QEvent.MouseButtonRelease, pos, button, QtCore.Qt.NoButton, modifier)
+    QtGui.QApplication.sendEvent(widget, event)
+
+
+def mouseMove(widget, pos, buttons=None, modifier=None):
+    if isinstance(widget, QtGui.QGraphicsView):
+        widget = widget.viewport()
+    if modifier is None:
+        modifier = QtCore.Qt.NoModifier
+    if buttons is None:
+        buttons = QtCore.Qt.NoButton
+    if QT_LIB != 'PyQt5' and isinstance(pos, QtCore.QPointF):
+        pos = pos.toPoint()
+    event = QtGui.QMouseEvent(QtCore.QEvent.MouseMove, pos, QtCore.Qt.NoButton, buttons, modifier)
+    QtGui.QApplication.sendEvent(widget, event)
+
+
+def mouseDrag(widget, pos1, pos2, button, modifier=None):
+    mouseMove(widget, pos1)
+    mousePress(widget, pos1, button, modifier)
+    mouseMove(widget, pos2, button, modifier)
+    mouseRelease(widget, pos2, button, modifier)
+
+    
+def mouseClick(widget, pos, button, modifier=None):
+    mouseMove(widget, pos)
+    mousePress(widget, pos, button, modifier)
+    mouseRelease(widget, pos, button, modifier)
+