"""
     qtgui/MGSimpleWidgets.py: CCP4MG Molecular Graphics Program
     Copyright (C) 2001-2008 University of York, CCLRC

     This library is free software: you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public License
     version 3, modified in accordance with the provisions of the 
     license to address the requirements of UK law.
 
     You should have received a copy of the modified GNU Lesser General 
     Public License along with this library.  If not, copies may be 
     downloaded from http://www.ccp4.ac.uk/ccp4license.php
 
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
"""
from PyQt4 import QtCore, QtGui, QtSvg
import os

class InteractiveLabel(QtGui.QLabel):
    def __init__(self,parent=None):
        QtGui.QLabel.__init__(self,parent)

    def mousePressEvent(self, event):
        self.emit(QtCore.SIGNAL("MousePressed"),event)

    def mouseMoveEvent(self, event):
        self.emit(QtCore.SIGNAL("MouseMoved"),event)

    def mouseReleaseEvent(self, event):
        self.emit(QtCore.SIGNAL("MouseReleased"),event)


class SVGLabel(InteractiveLabel):

	def __init__(self,parent=None):
		InteractiveLabel.__init__(self,parent)
		self._svg = QtSvg.QSvgRenderer(self)
		self._bounds = None
		#self._viewport = QtCore.QRect(0,0,100,100)

	def loadFile(self,filename=None):
		self._svg.load(filename)

	def setSVGSize(self,width,height):
		#self._viewport = QtCore.QRect(0,0,width,height)
		pass

	def draw(self,painter):
		painter.begin(self)
		if self._bounds:
			self._svg.render(painter,self._bounds)
		else:
			self._svg.render(painter)
		painter.end()

	def paintEvent(self,e):
		QtGui.QLabel.paintEvent(self,e)
		painter = QtGui.QPainter()
		self.draw(painter)

class MultiSlider(QtGui.QWidget):
	def toggleLock(self,e=None):
		self._lock = 1-self._lock
		if self._lock:
			mean = 0
			for slider in self.sliders:
				mean = mean + slider.value()
			if len(self.sliders)>0:
				mean = mean / len(self.sliders)
				for slider in self.sliders:
					slider.setValue(mean)
		icon_path = os.path.join(os.environ['CCP4MG'],'qticons')
		if self._lock == 0:
			self.padlock.loadFile(os.path.join(icon_path,"padlock_open.svg"))
		else:
			self.padlock.loadFile(os.path.join(icon_path,"padlock.svg"))
		self.repaint()


	def setValues(self,vals):
		for val in vals:
			for val2 in vals:
				if val != val2:
					self._lock=0
					icon_path = os.path.join(os.environ['CCP4MG'],'qticons')
					self.padlock.loadFile(os.path.join(icon_path,"padlock_open.svg"))
		for val,slider in zip(vals,self.sliders):
			slider.setValue(val)

	def values(self):
		vals = []
		for slider in self.sliders:
			vals.append(slider.value())
		return vals

	def sliderChanged(self,slider=None,val=None):
		if self._lock:
			for slider in self.sliders:
				slider.setValue(val)

		vals = self.values()
		self.emit(QtCore.SIGNAL("valuesChanged"),(vals))

	def __init__(self,parent=None,number=1,labels=[],orientation=QtCore.Qt.Horizontal):
		from guiUtils import partialWithSignal
		QtGui.QWidget.__init__(self,parent)
		icon_path = os.path.join(os.environ['CCP4MG'],'qticons')
		layout = QtGui.QGridLayout()
		layout.setContentsMargins(0,0,0,0)
		layout.setVerticalSpacing(0)
		self._lock = 1
		self.sliders = []
		for i in range(number):
			slider = QtGui.QSlider(orientation)
			self.sliders.append(slider)
			self.connect(slider,QtCore.SIGNAL("valueChanged(int)"),partialWithSignal(self.sliderChanged,i))
			layout.addWidget(slider,i,1)
			if i == number-1:
				icon = QtGui.QPixmap(os.path.join(icon_path,"bottom_right_junc.svg")).scaled(20,30)
				label = QtGui.QLabel()
				label.setPixmap(icon)
				layout.addWidget(label,i,2)
			elif i==0:
				icon = QtGui.QPixmap(os.path.join(icon_path,"top_right_junc.svg")).scaled(20,30)
				label = QtGui.QLabel()
				label.setPixmap(icon)
				layout.addWidget(label,i,2)
			elif i==number/2:
				self.padlock = SVGLabel()
				self.padlock.loadFile(os.path.join(icon_path,"padlock.svg"))
				layout.addWidget(self.padlock,i,2)
				self.connect(self.padlock,QtCore.SIGNAL("MousePressed"),self.toggleLock)
			else:
				icon = QtGui.QPixmap(os.path.join(icon_path,"middle_right_junc.svg")).scaled(20,30)
				label = QtGui.QLabel()
				label.setPixmap(icon)
				layout.addWidget(label,i,2)
		for i in range(len(labels)):
			label = QtGui.QLabel(labels[i])
			layout.addWidget(label,i,0)
		self.setLayout(layout)