To let the user move around the map, we'll make use of the PanTool class we implemented in an earlier chapter. Add the following class definition to the mapTools.py module:
class PanTool(QgsMapTool):
def __init__(self, mapCanvas):
QgsMapTool.__init__(self, mapCanvas)
self.setCursor(Qt.OpenHandCursor)
self.dragging = False
def canvasMoveEvent(self, event):
if event.buttons() == Qt.LeftButton:
self.dragging = True
self.canvas().panAction(event)
def canvasReleaseEvent(self, event):
if event.button() == Qt.LeftButton and self.dragging:
self.canvas().panActionEnd(event.pos())
self.dragging = FalseBack in our forestTrails.py module, add the following new method:
def setupMapTools(self):
self.panTool = PanTool(self.mapCanvas)
self.panTool.setAction(self.actionPan)This method will initialize the various map tools that our application will use; we'll add to this method...