コード例 #1
0
    def run_filter(self):
        """Run method that performs the filter"""

        #Retrieve selected layers (or group members)
        selectedLayers = iface.layerTreeView().selectedLayersRecursive()
        #Sadly, the layer order is not good, so will sort it by name
        sortedSelectedLayers = sorted(selectedLayers, key=lambda x: x.name())

        # To creates layer
        # layer = QgsVectorLayer("Point?crs=epsg:4326&index=yes",
        #                     "temporary_points", "memory")
        # QgsProject.instance().addMapLayer(layer)

        # Look up for the first valid layer
        for layer in sortedSelectedLayers:

            if layer and layer.isValid():

                #Fire up the query builder based on the first layer
                query_builder = QgsQueryBuilder(layer)
                #query_builder.setSql(u'"age" > 30')
                query_builder.accept()

                if query_builder.exec_():  #exec_ waits, show not

                    expression = query_builder.sql()

                    #Set filter for all selected layers
                    for layer in sortedSelectedLayers:
                        layer.setSubsetString(expression)
                        layer.triggerRepaint()
                        #print(layer)
                        #print(layer.id())

                del (query_builder)
                del (layer)

                #exit loop
                break
コード例 #2
0
pr = vl.dataProvider()

# add fields
pr.addAttributes([QgsField("name", QVariant.String), QgsField("age", QVariant.Int), QgsField("size", QVariant.Double)])
vl.updateFields()  # tell the vector layer to fetch changes from the provider

infos = [
    [10, 10, "John", 24, 1.73],
    [40, -60, "Paul", 29, 1.86],
    [60, 5, "George", 34, 1.69],
    [0, 45, "Ringo", 73, 1.75],
]

# add features
for i in infos:
    fet = QgsFeature()
    fet.setGeometry(QgsGeometry.fromPoint(QgsPoint(i[0], i[1])))
    fet.setAttributes(i[2:5])
    pr.addFeatures([fet])

# update layer's extent when new features have been added
# because change of extent in provider is not propagated to the layer
vl.updateExtents()

QgsMapLayerRegistry.instance().addMapLayer(vl)

query_builder = QgsQueryBuilder(vl)
query_builder.setSql(u'"age" > 30')
query_builder.accept()
query_builder.show()
コード例 #3
0
class Widget(QWidget):
    def __init__(self, gtoAction, parent=None):
        super(Widget, self).__init__(parent)
        # from gtoAction
        self.gtomain = gtoAction.gtomain
        self.info = gtoAction.info
        self.debug = gtoAction.debug
        try:
            # from main
            self.helper = self.gtomain.helper
            self.iface = self.gtomain.iface
            self.metadata = self.gtomain.metadata
            self.prj = self.gtomain.prj
            self.canvas = self.iface.mapCanvas()
            # tooldata
            self.config = gtoAction.config
            self.tools = gtoAction.tools
            self.layers = self.config.get('layers', None)

            # load ui
            uic.loadUi(
                os.path.join(os.path.dirname(__file__), 'gto_expression.ui'),
                self)
            self.btnOk.clicked.connect(lambda: self.EvalExpr(
                self.lblLayer.text(), self.lblExpr.text()))
            self.btnDelete.clicked.connect(self.deleteEntry)
            self.btnNew.clicked.connect(self.newEntry)

            self.cboQuieries.currentIndexChanged.connect(self.setData)

            self.loadData()
            self.setData()

        except Exception as e:
            self.info.err(e)

    def setIconSizes(self, toolbar):
        try:
            btns = self.findChildren(QToolButton)
            for btn in btns:
                btn.setIconSize(self.iface.iconSize())
        except Exception as e:
            self.info.err(e)

    def reset(self, *args):  # from gtotoolbar before cleared
        try:
            if self.debug: self.info.log("widget reset")
        except Exception as e:
            self.info.err(e)

    def newEntry(self):
        try:
            if self.selectLayer() == QDialog.Accepted:
                ok, sql = self.showQueryBuilder(self.iface.activeLayer(),
                                                False)
                if ok and sql:
                    newName, ok = QInputDialog().getText(
                        self, 'Neue Abfrage', "Name:")
                    if newName and ok:
                        if not self.cboQuieries.findText(
                                newName, Qt.MatchExactly):
                            self.info("Abfrage <%s> existiert bereits!" %
                                      newName)
                        else:
                            self.cboQuieries.addItem(
                                newName,
                                [sql, self.iface.activeLayer().name()])
                            self.cboQuieries.setCurrentIndex(
                                self.cboQuieries.findText(
                                    newName, Qt.MatchExactly))
                            if self.debug:
                                self.info.log(self.cboQuieries.currentData())
                            self.saveData()
        except Exception as e:
            self.info.err(e)

    def loadData(self):
        try:
            file = os.path.join(self.metadata.dirGTO, 'expressions.txt')
            if self.debug: self.info.log("Data file:", file)
            if os.path.isfile(file):
                f = open(file, 'r')
                content = f.readlines()
                for line in content:
                    try:
                        data = line.split('|')
                        self.cboQuieries.addItem(data[0], [data[1], data[2]])
                    except Exception as e:
                        self.info.err(e)
                f.close()
                os.remove(file)
                if self.debug: self.info.log("File data:", content)
            else:
                # json
                file = os.path.join(self.metadata.dirGTO, 'expressions.json')
                data = self.helper.readJson(file)
                if data is not None:
                    for k in data.keys():
                        v = data[k]
                        if self.debug: self.info.log(k, v)
                        self.cboQuieries.addItem(k,
                                                 [v["expression"], v["layer"]])
            self.cboQuieries.repaint()
        except Exception as e:
            self.info.err(e)

    def deleteEntry(self):
        try:
            if self.info.gtoQuestion(
                    'Abfrage <{0}> löschen?'.format(
                        self.cboQuieries.currentText()),
                    "Abfrage löschen") == QMessageBox.Yes:
                self.cboQuieries.removeItem(self.cboQuieries.currentIndex())
                if self.cboQuieries.count() == 0:
                    self.lblLayer.setText('')
                    self.lblExpr.setText('')
                self.saveData()
        except Exception as e:
            self.info.err(e)

    def saveData(self):
        try:
            file = os.path.join(self.metadata.dirGTO, 'expressions.json')
            if self.debug: self.info.log("saveData:", file)
            data = {}
            for i in range(self.cboQuieries.count()):
                idata = self.cboQuieries.itemData(i)
                data[self.cboQuieries.itemText(i)] = {
                    "layer": idata[1],
                    "expression": idata[0]
                }
            if self.debug: self.info.log("saveData", data)
            if os.path.isfile(file): os.remove(file)
            self.helper.writeJson(file, data)
        except Exception as e:
            self.info.err(e)

    def setData(self):
        try:
            data = self.cboQuieries.currentData()
            if data:
                expr = data[0]
                layname = data[1]
                self.lblLayer.setText(layname)
                self.lblExpr.setText(expr)
        except Exception as e:
            self.info.err(e)

    def EvalExpr(self, layername, expr):
        try:
            index = self.cboQuieries.currentIndex()
            layer = self.prj.mapLayersByName(layername)[0]
            context = QgsExpressionContext()
            scope = QgsExpressionContextScope()
            context.appendScope(scope)
            listOfResults = []
            features = [feat for feat in layer.getFeatures()]
            for feat in features:
                scope.setFeature(feat)
                exp = QgsExpression(expr)
                if exp.evaluate(context):
                    listOfResults.append(feat.id())
            if len(listOfResults) == 0:
                self.info.msg('Kein Ergebnis!')
            else:
                layer.selectByIds(listOfResults)
                self.iface.setActiveLayer(layer)
                self.gtomain.runcmd(self.tools)
            self.cboQuieries.setCurrentIndex(index)
        except Exception as e:
            self.info.err(e)

    def showQueryBuilder(self, layer, filter, sql=None):
        try:
            if not layer: layer = self.iface.activeLayer()
            self.query_builder = QgsQueryBuilder(layer,
                                                 self.iface.mainWindow())
            if sql: self.query_builder.setSql(sql)
            self.query_builder.accept()
            result = self.query_builder.exec_()
            if self.debug:
                self.info.log("QueryBuilder", self.query_builder.sql(), result,
                              layer.subsetString())
            if not filter: layer.setSubsetString(None)
            return result, self.query_builder.sql()
        except Exception as e:
            self.info.err(e)

    def selectLayer(self, editable=False):
        try:
            self.dlgLayers = QDialog(self.iface.mainWindow())
            self.dlgLayers.setWindowTitle('Neue Abfrage')
            self.lay = QVBoxLayout(self.dlgLayers)
            self.lay.addWidget(QLabel("Layerauswahl:"))
            self.LayerList = QListWidget()
            self.lay.addWidget(self.LayerList)
            self.btnBox = QDialogButtonBox(self.dlgLayers)
            self.btnBox.setStandardButtons(QDialogButtonBox.Cancel
                                           | QDialogButtonBox.Ok)
            self.lay.addWidget(self.btnBox)
            if self.layers != None:
                for ml in self.layers:
                    try:
                        lay = self.prj.mapLayersByName(ml)[0]
                        item = QListWidgetItem(lay.name())
                        self.LayerList.addItem(item)
                    except:
                        pass
            else:
                vectorLayers = [
                    layer for layer in self.iface.mapCanvas().layers()
                ]
                for ml in vectorLayers:
                    self.info.log(type(ml))
                    if isinstance(ml, QgsVectorLayer):
                        item = QListWidgetItem(ml.name())
                        self.LayerList.addItem(item)
            if self.iface.activeLayer():
                items = self.LayerList.findItems(
                    self.iface.activeLayer().name(), Qt.MatchExactly)
                if len(items) > 0:
                    self.LayerList.setCurrentItem(items[0])
            self.btnBox.accepted.connect(self.setActiveLayer)
            self.btnBox.rejected.connect(self.dlgLayers.reject)
            return self.dlgLayers.exec_()
        except Exception as e:
            self.info.err((e))

    def setActiveLayer(self):
        try:
            lay = self.LayerList.currentItem().text()
            lay = self.prj.mapLayersByName(lay)[0]
            self.iface.setActiveLayer(lay)
            self.dlgLayers.accept()
        except Exception as e:
            self.info.err((e))
コード例 #4
0
pr = vl.dataProvider()

# add fields
pr.addAttributes([
    QgsField("name", QVariant.String),
    QgsField("age", QVariant.Int),
    QgsField("size", QVariant.Double)
])
vl.updateFields()  # tell the vector layer to fetch changes from the provider

infos = [[10, 10, "John", 24, 1.73], [40, -60, "Paul", 29, 1.86],
         [60, 5, "George", 34, 1.69], [0, 45, "Ringo", 73, 1.75]]

# add features
for i in infos:
    fet = QgsFeature()
    fet.setGeometry(QgsGeometry.fromPoint(QgsPoint(i[0], i[1])))
    fet.setAttributes(i[2:5])
    pr.addFeatures([fet])

# update layer's extent when new features have been added
# because change of extent in provider is not propagated to the layer
vl.updateExtents()

QgsMapLayerRegistry.instance().addMapLayer(vl)

query_builder = QgsQueryBuilder(vl)
query_builder.setSql(u'"age" > 30')
query_builder.accept()
query_builder.show()