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swipe.py
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swipe.py
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# -*- coding: utf-8 -*-
# @Author : llc
# @Time : 2020/3/10 14:58
import os
from qgis.PyQt.QtCore import Qt
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtWidgets import QComboBox, QAction, QToolBar
from qgis.core import QgsProject
from qgis.gui import QgisInterface
from .mapTool import SwipeMapTool
here = os.path.dirname(__file__)
project = QgsProject.instance()
class Swipe:
def __init__(self, iface):
self.iface: QgisInterface = iface
self.mapCanvas = self.iface.mapCanvas()
self.preMapTool = None
self.toolBar: QToolBar = self.iface.addToolBar('Swipe Toolbar')
self.toolBar.setToolTip("Swipe Toolbar")
self.swipeAction = QAction(QIcon(os.path.join(here, 'icon.png')), 'Swipe Tool', self.toolBar)
self.swipeAction.setCheckable(True)
self.swipeAction.triggered.connect(self.swipeActionTriggered)
self.layerCombobox = QComboBox()
self.layerCombobox.setSizeAdjustPolicy(QComboBox.AdjustToContents)
self.layerCombobox.setFixedHeight(self.iface.iconSize().height())
self.swipeTool = SwipeMapTool(self.layerCombobox, self.mapCanvas)
# 图层变化信号
project.layerTreeRoot().layerOrderChanged.connect(self.updateCombobox)
project.layerTreeRoot().visibilityChanged.connect(self.updateCombobox)
project.layerTreeRoot().nameChanged.connect(self.updateCombobox)
# 地图工具变化
self.mapCanvas.mapToolSet.connect(self.mapCanvasMapToolSet)
# 初始化图层
self.updateCombobox()
def initGui(self):
self.toolBar.addAction(self.swipeAction)
self.toolBar.addWidget(self.layerCombobox)
def unload(self):
project.layerTreeRoot().layerOrderChanged.disconnect(self.updateCombobox)
project.layerTreeRoot().visibilityChanged.disconnect(self.updateCombobox)
project.layerTreeRoot().nameChanged.disconnect(self.updateCombobox)
self.mapCanvas.mapToolSet.disconnect(self.mapCanvasMapToolSet)
self.mapCanvas.unsetMapTool(self.swipeTool)
del self.toolBar
def swipeActionTriggered(self):
if self.layerCombobox.count() < 2:
self.swipeAction.setChecked(False)
self.iface.messageBar().pushMessage("At least two layers are required.")
return
self.swipeAction.setChecked(True)
if self.mapCanvas.mapTool() != self.swipeTool:
self.mapCanvas.setMapTool(self.swipeTool)
def updateCombobox(self):
self.layerCombobox.clear()
layers = project.layerTreeRoot().checkedLayers()
for layer in layers:
self.layerCombobox.addItem(layer.name(), layer.id())
if self.layerCombobox.count() < 2:
self.swipeAction.setChecked(False)
self.mapCanvas.unsetMapTool(self.swipeTool)
def mapCanvasMapToolSet(self, newTool, _):
if newTool.__class__.__name__ != 'SwipeMapTool':
self.swipeAction.setChecked(False)
if self.preMapTool == "SwipeMapTool":
self.mapCanvas.renderStarting.disconnect(self.renderStarting)
self.mapCanvas.renderComplete.disconnect(self.renderComplete)
self.preMapTool = None
else:
self.preMapTool = "SwipeMapTool"
self.mapCanvas.renderStarting.connect(self.renderStarting)
self.mapCanvas.renderComplete.connect(self.renderComplete)
def renderStarting(self):
self.mapCanvas.setCursor(Qt.BusyCursor)
def renderComplete(self):
cursor = self.mapCanvas.cursor()
pos = cursor.pos()
# 触发鼠标移动事件
cursor.setPos(pos.x() + 1, pos.y() + 1)