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121 lines
4.0 KiB
Python
121 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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/***************************************************************************
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Name : DB Manager
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Description : Database manager plugin for QuantumGIS
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Date : May 23, 2011
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copyright : (C) 2011 by Giuseppe Sucameli
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email : brush.tyler@gmail.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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"""
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from qgis.gui import QgsMapCanvas, QgsMapCanvasLayer
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from qgis.core import QgsVectorLayer, QgsMapLayerRegistry
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from .db_plugins.plugin import DbError, Table
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class LayerPreview(QgsMapCanvas):
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def __init__(self, parent=None):
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QgsMapCanvas.__init__(self, parent)
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self.setCanvasColor(QColor(255,255,255))
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self.item = None
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self.dirty = False
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# reuse settings from QGIS
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settings = QSettings()
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self.enableAntiAliasing( settings.value( "/qgis/enable_anti_aliasing", QVariant(False) ).toBool() )
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self.useImageToRender( settings.value( "/qgis/use_qimage_to_render", QVariant(False) ).toBool() )
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action = settings.value( "/qgis/wheel_action", QVariant(0) ).toInt()[0]
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zoomFactor = settings.value( "/qgis/zoom_factor", QVariant(2) ).toDouble()[0]
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self.setWheelAction( QgsMapCanvas.WheelAction(action), zoomFactor )
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self._clear()
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def refresh(self):
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self.setDirty(True)
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self.loadPreview( self.item )
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def loadPreview(self, item, force=False):
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if item == self.item and not self.dirty:
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return
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self._clear()
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if item is None:
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return
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if isinstance(item, Table) and item.type in [Table.VectorType, Table.RasterType]:
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# update the preview, but first let the manager chance to show the canvas
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runPrev = lambda: self._loadTablePreview( item )
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QTimer.singleShot(50, runPrev)
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else:
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return
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self.item = item
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self.connect(self.item, SIGNAL('aboutToChange'), self.setDirty)
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def setDirty(self, val=True):
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self.dirty = val
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def _clear(self):
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""" remove any layers from preview canvas """
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if self.item is not None:
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self.disconnect(self.item, SIGNAL('aboutToChange'), self.setDirty)
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self.item = None
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self.dirty = False
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self.currentLayerId = None
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self.setLayerSet( [] )
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def _loadTablePreview(self, table, limit=False):
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""" if has geometry column load to map canvas """
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QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
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self.setRenderFlag(False)
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newLayerId = None
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if table.geomType:
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# limit the query result if required
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if limit and table.rowCount > 1000:
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uniqueField = table.getValidQGisUniqueFields(True)
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if uniqueField == None:
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QMessageBox.warning(self, "Sorry", "Unable to find a valid unique field")
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return
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uri = table.database().uri()
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uri.setDataSource("", u"(SELECT * FROM %s LIMIT 1000)" % table.quotedName(), table.geomColumn, "", uniqueField.name)
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provider = table.database().dbplugin().providerName()
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vl = QgsVectorLayer(uri.uri(), table.name, provider)
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else:
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vl = table.toMapLayer()
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if not vl.isValid():
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self.setLayerSet( [] )
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else:
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newLayerId = vl.id() if hasattr(vl, 'id') else vl.getLayerID()
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self.setLayerSet( [ QgsMapCanvasLayer(vl) ] )
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QgsMapLayerRegistry.instance().addMapLayer(vl, False)
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self.zoomToFullExtent()
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# remove old layer (if any) and set new
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if self.currentLayerId:
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QgsMapLayerRegistry.instance().removeMapLayer(self.currentLayerId, False)
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self.currentLayerId = newLayerId
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self.setRenderFlag(True)
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QApplication.restoreOverrideCursor()
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