Btw, I have created a pull request for this. Hopefully, it will be in
core for 2.1 !
On 08/22/2013 02:11 PM, Alexandre Neto wrote:
Hello all,
I'm updating the Multipart split plugin
<http://plugins.qgis.org/plugins/splitmultipart/> to make it work with
the 2.0 API.
Has I have successfully updated the plugin to make it work in 2.0, I
would like to improve it's button behavior to work like the rest of
the advanced editing toolbar. I am able to enable and disable it if
the current layer is editable.
Now I'm trying to get the same behavior if there are selected
features. I have made it work, but QGIS starts to get really slow... I
found out that's because lots of connections are being created to
SIGNAL("selectionChanged()").
Can someone please, point me in the right direction, or tell me where
can I find some code example doing this?
Thank you very much,
Alexandre Neto
Part of the code bellow:
def initGui(self):
# Create action that will start plugin configuration
self.action = QAction(
QIcon(":/plugins/splitmultipart/icon.svg"),
QCoreApplication.translate('Multipart split', u"Split
Selected Multipart features"), self.iface.mainWindow())
self.action.setEnabled(False)
# connect to signals for button behavior
QObject.connect(self.action, SIGNAL("triggered()"), self.run)
QObject.connect(self.iface,
SIGNAL("currentLayerChanged(QgsMapLayer*)"), self.toggle)
#QObject.connect(self.iface,
SIGNAL("selectionChanged(QgsMapLayer *)"), self.toggle)
# Add toolbar button and menu item
self.iface.advancedDigitizeToolBar().addAction(self.action)
self.iface.editMenu().addAction(self.action)
def toggle(self):
mc = self.canvas
layer = mc.currentLayer()
# Decide whether the plugin button is enable or disable
if layer <> None:
# set enable
if layer.isEditable():
QObject.connect(layer,SIGNAL("editingStopped()"),self.toggle)
QObject.connect(layer, SIGNAL("selectionChanged()"),
self.toggle)
QObject.disconnect(layer,SIGNAL("editingStarted()"),self.toggle)
self.iface.messageBar().pushMessage("Debug"," Connect
SIGNAL(selectionChanged()",0)
if layer.selectedFeatureCount() > 0:
self.action.setEnabled(True)
else:
self.action.setEnabled(False)
# set disable
else:
self.action.setEnabled(False)
QObject.connect(layer,SIGNAL("editingStarted()"),self.toggle)
QObject.disconnect(layer,SIGNAL("editingStopped()"),self.toggle)
QObject.disconnect(layer,
SIGNAL("selectionChanged()"), self.toggle)
self.iface.messageBar().pushMessage("Debug"," Disconnect
SIGNAL(selectionChanged()",0)
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