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On rectangle selection, add features to selection if shift is pressed, remove them from selection if ctrl is pressed or just set selection otherwise #5

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On rectangle selection, add features to selection if shift is pressed, remove them from selection if ctrl is pressed or just set selection otherwise #5

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38 changes: 24 additions & 14 deletions MultiLayerRectangleSelection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,11 @@

@author: ferrari
'''
from qgis.core import QgsMapLayer, QgsPointXY, QgsRectangle, QgsWkbTypes
from qgis.core import (
QgsMapLayer, QgsPointXY, QgsRectangle, QgsWkbTypes, QgsVectorLayer, Qgis)
from qgis.gui import QgsMapTool, QgsRubberBand
from qgis.PyQt.QtGui import QColor
from qgis.PyQt.QtCore import Qt

class MultiLayerRectangleSelection(QgsMapTool):

Expand All @@ -19,37 +21,46 @@ def __init__(self, canvas, action):
self.rubberBand.setColor(mFillColor)
self.rubberBand.setWidth(1)
self.reset()

def reset(self):
self.startPoint = self.endPoint = None
self.isEmittingPoint = False
self.rubberBand.reset(QgsWkbTypes.PolygonGeometry)

def canvasPressEvent(self, e):
self.startPoint = self.toMapCoordinates(e.pos())
self.endPoint = self.startPoint
self.isEmittingPoint = True
self.showRect(self.startPoint, self.endPoint)

def canvasReleaseEvent(self, e):
self.isEmittingPoint = False
r = self.rectangle()
layers = self.canvas.layers()
if Qgis.QGIS_VERSION_INT < 32200:
select_behavior_obj = QgsVectorLayer.SelectBehavior
else:
select_behavior_obj = Qgis.SelectBehavior
if e.modifiers() == Qt.ShiftModifier:
select_behavior = select_behavior_obj.AddToSelection
elif e.modifiers() == Qt.ControlModifier:
select_behavior = select_behavior_obj.RemoveFromSelection
else:
select_behavior = select_behavior_obj.SetSelection
for layer in layers:
if layer.type() == QgsMapLayer.RasterLayer:
continue
if r is not None:
lRect = self.canvas.mapSettings().mapToLayerCoordinates(layer, r)
layer.selectByRect(lRect, False)

layer.selectByRect(lRect, select_behavior)
self.rubberBand.hide()

def canvasMoveEvent(self, e):
if not self.isEmittingPoint:
return
self.endPoint = self.toMapCoordinates( e.pos() )
self.showRect(self.startPoint, self.endPoint)

def showRect(self, startPoint, endPoint):
self.rubberBand.reset(QgsWkbTypes.PolygonGeometry)
if startPoint.x() == endPoint.x() or startPoint.y() == endPoint.y():
Expand All @@ -58,32 +69,31 @@ def showRect(self, startPoint, endPoint):
point2 = QgsPointXY(startPoint.x(), endPoint.y())
point3 = QgsPointXY(endPoint.x(), endPoint.y())
point4 = QgsPointXY(endPoint.x(), startPoint.y())

self.rubberBand.addPoint(point1, False)
self.rubberBand.addPoint(point2, False)
self.rubberBand.addPoint(point3, False)
self.rubberBand.addPoint(point4, True) # true to update canvas
self.rubberBand.show()

def rectangle(self):
if self.startPoint is None or self.endPoint is None:
return None
elif self.startPoint.x() == self.endPoint.x() or self.startPoint.y() == self.endPoint.y():
return None

return QgsRectangle(self.startPoint, self.endPoint)

def deactivate(self):
self.rubberBand.reset()
try:
if self is not None:
QgsMapTool.deactivate(self)
except:
pass

def activate(self):
QgsMapTool.activate(self)

def unload(self):
self.deactivate()