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from PyQt4.QtGui import QComboBox, QLabel, QHBoxLayout, QSpinBox, QVBoxLayout
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from qgis.core import QgsFeatureRendererV2, QgsRendererV2AbstractMetadata
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from qgis.gui import QgsRendererV2Widget
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from utils import symbolForCode, getDefaultSymbol
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class MyTestRenderer(QgsFeatureRendererV2):
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def __init__(self, size=40, field='', fields=[]):
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QgsFeatureRendererV2.__init__(self, 'MyTestRenderer')
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self.field = field
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self.fields = fields
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self.size = size
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self.def_symbol = getDefaultSymbol(self.size)
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def symbolForFeature(self, feature):
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return self.def_symbol
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def startRender(self, context, fields):
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self.def_symbol.startRender(context)
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def stopRender(self, context):
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self.def_symbol.stopRender(context)
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def usedAttributes(self):
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return self.fields
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def symbols2(self, context):
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return [self.def_symbol]
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def clone(self):
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return MyTestRenderer(self.size, self.field, self.fields)
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def save(self, doc):
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elem = doc.createElement('renderer-v2')
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elem.setAttribute('type', 'MyTestRenderer')
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elem.setAttribute('size', self.size)
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elem.setAttribute('field', self.field)
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return elem
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class MyTestRendererWidget(QgsRendererV2Widget):
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def __init__(self, layer, style, renderer):
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QgsRendererV2Widget.__init__(self, layer, style)
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if renderer is None or renderer.type() != 'MyTestRenderer':
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fields = [f.name() for f in layer.dataProvider().fields()]
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self.r = MyTestRenderer(field=fields[0], fields=fields)
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else:
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self.r = renderer.clone()
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self.combo = QComboBox()
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for f in layer.dataProvider().fields():
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self.combo.addItem(f.name(), f.name())
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idx = max(0, layer.dataProvider().fieldNameIndex(self.r.field))
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self.combo.setCurrentIndex(idx)
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self.combo.currentIndexChanged.connect(self.fieldChanged)
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self.labelField = QLabel('Code field')
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self.hbox = QHBoxLayout()
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self.hbox.addWidget(self.labelField)
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self.hbox.addWidget(self.combo)
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self.spinSize = QSpinBox()
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self.spinSize.setValue(self.r.size)
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self.spinSize.valueChanged.connect(self.sizeChanged)
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self.labelSize = QLabel('Size (pixels)')
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self.hbox2 = QHBoxLayout()
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self.hbox2.addWidget(self.labelSize)
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self.hbox2.addWidget(self.spinSize)
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self.vbox = QVBoxLayout()
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self.vbox.addLayout(self.hbox)
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self.vbox.addLayout(self.hbox2)
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self.setLayout(self.vbox)
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def sizeChanged(self, value):
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self.r.size = value
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def fieldChanged(self):
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self.r.field = self.combo.currentText()
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def renderer(self):
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return self.r
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class MyTestRendererMetadata(QgsRendererV2AbstractMetadata):
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def __init__(self):
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QgsRendererV2AbstractMetadata.__init__(self, 'MyTestRenderer', 'My test renderer')
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def createRenderer(self, element):
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return MyTestRenderer(int(element.attribute('size')), element.attribute('field'))
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def createRendererWidget(self, layer, style, renderer):
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return MyTestRendererWidget(layer, style, renderer)
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