import os
import sys

from PySide2.QtCore import *
from PySide2.QtGui import *
from PySide2.QtWidgets import *

class MainWindow(QDialog):
	def __init__(self, parent = None):
		QDialog.__init__(self, parent)

		# Init settings
		self.setStyleSheet("QWidget{ background-color: rgba(0,0,0);}")

		self.groupLyt = QGridLayout()

		self.procSessBrwsr = ProcBrowserWidget(self)

		self.collapseProcBrowserBtn = QToolButton()
		self.collapseProcBrowserBtn.clicked.connect(self.collapseProcBrowser)
		self.collapseProcBrowserBtn.setText("Toggle List View")
		self.collapseProcBrowserBtn.setStyleSheet("QToolButton { font-size: 12pt; color:white; background: gray;}")

		self.groupLyt.addWidget( self.procSessBrwsr,  			0, 0, -1, 1, Qt.AlignLeft)
		self.groupLyt.addWidget( self.collapseProcBrowserBtn,  	0, 0, 1, 1, Qt.AlignLeft)
		self.groupLyt.setContentsMargins(1,1,1,1)
		self.groupLyt.setRowStretch(0,1)
		self.groupLyt.setRowStretch(1,99)

		self.setLayout(self.groupLyt)

		self.resize(800,600)
		self.show()

	def collapseProcBrowser(self):
		if self.procSessBrwsr.panelIsClosed == False:
			self.collapseProcBrowserBtn.setText("")
		else:
			self.collapseProcBrowserBtn.setText("Toggle List View")
		self.procSessBrwsr.collapseToggle()


class ProcBrowserWidget(QWidget):
	def __init__(self, parent = None ):
		QWidget.__init__(self , parent)
		self.parent = parent

		self.panelIsClosed = False

		self.spacerWidget = QToolButton()

		self.browserList = QListWidget(self)
		self.browserList.addItems(['Item A - Some Item', 'Item B - Some Item', 'Item C - Some Item', \
									'Item D - Some Item', 'Item E - Some Item', 'Item F - Some Item', \
									'Item G - Some Item', 'Item H - Some Item', 'Item I - Some Item', \
									'Item J - Some Item', 'Item K - Some Item', 'Item L - Some Item'])

		self.mainLyt = QGridLayout()
		self.mainLyt.setContentsMargins(0,0,0,0)
		self.mainLyt.addWidget(self.spacerWidget, 0, 0, Qt.AlignTop)
		self.mainLyt.addWidget(self.browserList , 1, 0)

		self.setLayout(self.mainLyt)

		self.setStyleSheet("QListWidget {\
						   background-color: rgba(20,20,20,240);\
						   font-size: 12pt;\
						   border-radius: 0px;\
						   border: 0px;}\n\
						   QListWidget::item { border: 0px; color: rgb(180,180,180);}\n\
						   QListWidget::item:selected {\
						   background-color:transparent;color:white;}\n\
						   QListWidget::item:hover {\
						   color:white;}" )

	def collapseToggle(self, duration = 100):
		localRec = self.geometry()

		if self.panelIsClosed == False:
			self.panelIsClosed = True
			self.hide()
			destRect = QRect( QPoint(self.geometry().topLeft().x(), self.geometry().topLeft().y()), \
							  QSize( 32, self.height() ) )
			opStart = 1
			opEnd = 0
		else:
			self.show()
			self.panelIsClosed = False
			destRect = QRect( QPoint(self.geometry().topLeft().x() + 1 , self.geometry().topLeft().y()), \
							  QSize( 200 , self.height() - 1 ) )
			opStart = 0
			opEnd = 1

		# Set Widget Size Animation
		self.animation = QPropertyAnimation(self, "geometry")
		self.animation.setDuration( duration )
		self.animation.setStartValue( localRec )
		self.animation.setEndValue( destRect  )
		self.animation.setEasingCurve(QEasingCurve.InOutQuad)
		self.animation.start()
		self.animation.finished.connect(self.animFinished)

		# Set Widget Opacity Animation
		fadeEffect = QGraphicsOpacityEffect(self.browserList);
		self.browserList.setGraphicsEffect(fadeEffect)
		self.animationOP = QPropertyAnimation(fadeEffect, "opacity")
		self.animationOP.setDuration( duration )
		self.animationOP.setStartValue( opStart )
		self.animationOP.setEndValue( opEnd  )
		self.animationOP.start()

	def animFinished(self):
		if self.panelIsClosed == True:
			self.hide()
			
if __name__ == '__main__':
	try:
		QApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
		QApplication.setAttribute(Qt.AA_UseHighDpiPixmaps)
	except Exception as e:
		pass

	app = QApplication(sys.argv)

	mainWin = MainWindow()

	sys.exit(app.exec_())