PyQt5实现让QScrollArea支持鼠标拖动的操作方法

如下所示：

#!/usr/bin/evn python3
# -*- coding: utf-8 -*-

import sys
from PyQt5.QtWidgets import (QApplication, QWidget, QScrollArea, QLabel)
from PyQt5.QtCore import QEvent

class TestWindow(QWidget):
	def __init__(self):
		super(TestWindow, self).__init__()
		self.resize(800, 600)
		self.move(0, 0)
		# self.setMouseTracking(False)
		self.last_time_move = 0
		self.initUI()

	def initUI(self):
		self.central_widget = QWidget(self)

		self.scroll_area = QScrollArea(self)
		self.scroll_area.setGeometry(0, 0, 400, 400)
		self.scroll_area.setWidgetResizable(True)
		self.scroll_bar = self.scroll_area.verticalScrollBar()

		self.scroll_contents = QWidget()
		self.scroll_contents.setGeometry(0, 0, 400, 800)
		self.scroll_contents.setMinimumSize(380, 1000)

		self.label_1 = QLabel(self.scroll_contents)
		self.label_1.move(50, 100)
		self.label_1.setText("HelloRyan")

		self.label_2 = QLabel(self.scroll_contents)
		self.label_2.move(50, 200)
		self.label_2.setText("你好")

		self.label_3 = QLabel(self.scroll_contents)
		self.label_3.move(50, 300)
		self.label_3.setText("-----------")

		self.label_4 = QLabel(self.scroll_contents)
		self.label_4.move(50, 400)
		self.label_4.setText("542543255235432543252")

		self.label_5 = QLabel(self.scroll_contents)
		self.label_5.move(50, 500)
		self.label_5.setText("5432543262542")

		self.label_6 = QLabel(self.scroll_contents)
		self.label_6.move(50, 600)
		self.label_6.setText("4325432532")

		self.scroll_area.setWidget(self.scroll_contents)
		self.scroll_area.installEventFilter(self)

	# def mouseMoveEvent(self, event):
	# 	if event.pos().x() > 0 and event.pos().x() < 400 and event.pos().y() > 0 and event.pos().y() < 400:
	# 		if self.last_time_move == 0:
	# 			self.last_time_move = event.pos().y()
	#
	# 		distance = self.last_time_move - event.pos().y()
	# 		self.scroll_bar.setValue(self.scroll_bar.value() + distance)
	#
	# 		self.last_time_move = event.pos().y()
	# 		print("move%d" % event.pos().y())
	#
	# def mouseReleaseEvent(self, event):
	# 	self.last_time_move = 0
	# 	print("up")

	def eventFilter(self, source, event):
		if event.type() == QEvent.MouseMove:
			print(event.pos().y())

			if self.last_time_move == 0:
				self.last_time_move = event.pos().y()

			distance = self.last_time_move - event.pos().y()
			self.scroll_bar.setValue(self.scroll_bar.value() + distance)
			self.last_time_move = event.pos().y()

		elif event.type() == QEvent.MouseButtonRelease:
			self.last_time_move = 0
		return QWidget.eventFilter(self, source, event)

if __name__ == "__main__":
	app = QApplication(sys.argv)
	test = TestWindow()
	test.show()
	sys.exit(app.exec_())

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