Graphics Reference
In-Depth Information
Implementing the track editing mode
Our final task for this chapter is to implement the track editing mode. We learned in the
previous chapter how we can turn on the editing mode for a map layer and then use various
map tools to let the user add, edit, and delete features. We'll start to implement the actual
map tools in
Chapter 9
,
Completing the ForestTrails Application
, but for now, let's define
our track editing mode itself.
The
setEditMode()
method is used to enter and leave the track editing mode. Replace
the placeholder method you defined earlier with this new implementation:
def setEditMode(self):
if self.editing:
if self.modified:
reply = QMessageBox.question(self, "Confirm",
"Save Changes?",
QMessageBox.Yes
|
QMessageBox.No,
QMessageBox.Yes)
if reply == QMessageBox.Yes:
self.trackLayer.commitChanges()
else:
self.trackLayer.rollBack()
else:
self.trackLayer.commitChanges()
self.trackLayer.triggerRepaint()
self.editing = False
self.setPanMode()
else:
self.trackLayer.startEditing()
self.trackLayer.triggerRepaint()
self.editing = True
self.modified = False
self.setPanMode()
self.adjustActions()
