rangeSlider.py @ 441a03f

ESS_GUIESS_GUI_DocsESS_GUI_batch_fittingESS_GUI_bumps_abstractionESS_GUI_iss1116ESS_GUI_iss879ESS_GUI_iss959ESS_GUI_openclESS_GUI_orderingESS_GUI_sync_sascalc

Last change on this file since 441a03f was 7969b9c, checked in by Piotr Rozyczko <rozyczko@…>, 7 years ago
More functionality conversion
Property mode set to `100644`
File size: 11.0 KB

Rev	Line
[5d89f43]	1	# -- coding: utf-8 --
	2
	3	"""
	4	/***************************************************************************
	5	Name : RangeSlider
	6	Description : A slider for ranges
	7	Date : Jun 20, 2012
	8	copyright : (C) 2012 by Giuseppe Sucameli
	9	email : brush.tyler@gmail.com
	10
	11	the code is based on RangeSlider by phil
	12	(see https://svn.enthought.com/enthought/browser/TraitsBackendQt/trunk/enthought/traits/ui/qt4/extra/range_slider.py) licensed under GPLv2
	13	***************************************************************************/
	14
	15	/***************************************************************************
	16	* *
	17	* This program is free software; you can redistribute it and/or modify *
	18	* it under the terms of the GNU General Public License as published by *
	19	* the Free Software Foundation; either version 2 of the License, or *
	20	* (at your option) any later version. *
	21	* *
	22	***************************************************************************/
	23	"""
	24
[4992ff2]	25	from PyQt5 import QtCore
	26	from PyQt5 import QtGui
	27	from PyQt5 import QtWidgets
[5d89f43]	28
[4992ff2]	29	class RangeSlider(QtWidgets.QSlider):
[5d89f43]	30	""" A slider for ranges.
	31
	32	This class provides a dual-slider for ranges, where there is a defined
	33	maximum and minimum, as is a normal slider, but instead of having a
	34	single slider value, there are 2 slider values.
	35
	36	This class emits the same signals as the QSlider base class, with the
	37	exception of valueChanged.
	38
	39	In addition, two new signals are emitted to catch the movement of
	40	each handle, lowValueChanged(int) and highValueChanged(int).
	41	"""
	42	highValueChanged = QtCore.pyqtSignal(int)
	43	lowValueChanged = QtCore.pyqtSignal(int)
	44	def __init__(self, *args):
	45	super(RangeSlider, self).__init__(*args)
	46
	47	self._low = self.minimum()
	48	self._high = self.maximum()
	49
[4992ff2]	50	self.pressed_control = QtWidgets.QStyle.SC_None
	51	self.hover_control = QtWidgets.QStyle.SC_None
[5d89f43]	52	self.click_offset = 0
	53
	54	# -1 for the low, 1 for the high, 0 for both
	55	self.active_slider = -1
	56
	57	def lowValue(self):
	58	return self._low
	59
	60	def setLowValue(self, low):
	61	if low < self.minimum():
	62	low = self.minimum()
	63	if low == self._low:
	64	return
	65
	66	self._low = low
	67	self.update()
	68
	69	if self.hasTracking():
	70	self.lowValueChanged.emit(self._low)
	71
	72	def highValue(self):
	73	return self._high
	74
	75	def setHighValue(self, high):
	76	if high > self.maximum():
	77	high = self.maximum()
	78	if high == self._high:
	79	return
	80
	81	self._high = high
	82	self.update()
	83
	84	if self.hasTracking():
	85	self.lowValueChanged.emit(self._high)
	86
	87	def paintEvent(self, event):
	88	# based on http://qt.gitorious.org/qt/qt/blobs/master/src/gui/widgets/qslider.cpp
	89
	90	painter = QtGui.QPainter(self)
[7969b9c]	91	style = QtWidgets.QApplication.style()
[5d89f43]	92
	93	for i, value in enumerate([self._low, self._high]):
[4992ff2]	94	opt = QtWidgets.QStyleOptionSlider()
[5d89f43]	95	self.initStyleOption(opt)
	96
	97	gr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderGroove, self)
	98	sr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderHandle, self)
	99
	100	if self.orientation() == QtCore.Qt.Horizontal:
	101	handle_length = sr.width()
	102	slider_length = gr.width()
	103	slider_min = gr.x()
	104	slider_max = gr.right() - handle_length + 1
	105	else:
	106	handle_length = sr.height()
	107	slider_length = gr.height()
	108	slider_min = gr.y()
	109	slider_max = gr.bottom() - handle_length + 1
	110
[4992ff2]	111	opt.subControls = QtWidgets.QStyle.SC_SliderGroove \| QtWidgets.QStyle.SC_SliderHandle
[5d89f43]	112
	113	# draw the first slider with inverted appearance, then the second
	114	# slider drawn on top of the existing ones
	115	if i == 0:
	116	if self.orientation() == QtCore.Qt.Horizontal:
	117	opt.upsideDown = not self.invertedAppearance()
	118	else:
	119	opt.upsideDown = self.invertedAppearance()
	120
	121	if self.orientation() == QtCore.Qt.Horizontal:
	122	opt.sliderValue = value - self.minimum()
	123	opt.sliderPosition = self.minimum() + (self.maximum() - value)
	124
	125	opt.rect.setX(slider_min)
	126	opt.rect.setWidth(slider_length)
	127
	128	else:
	129	opt.rect.setY(slider_min)
	130	opt.rect.setHeight(slider_length)
	131
	132	else:
	133	# do not highlight the second part when has focus to avoid
	134	# drawing of partially overlapped semi-transparent backgrounds
[4992ff2]	135	opt.state &= ~QtWidgets.QStyle.State_HasFocus
[5d89f43]	136
	137	opt.sliderValue = 0
	138	opt.sliderPosition = self.minimum()
	139
	140	if self.orientation() == QtCore.Qt.Horizontal:
	141	opt.upsideDown = self.invertedAppearance()
	142
	143	pos = style.sliderPositionFromValue(0, self.maximum()-self.minimum(),
	144	value-self.minimum(), slider_max - slider_min - 4,
	145	opt.upsideDown)
	146
	147	opt.rect.setX(pos + 3)
	148	opt.rect.setWidth(slider_max - pos + handle_length - 3)
	149
	150	else:
	151	opt.upsideDown = not self.invertedAppearance()
	152
	153	pos = style.sliderPositionFromValue(0, self.maximum()-self.minimum(),
	154	self.maximum()-value, slider_max - slider_min - 4,
	155	opt.upsideDown)
	156
	157	opt.rect.setY(slider_min-1)
	158	opt.rect.setHeight(slider_min + slider_length - pos - 2)
	159
	160	if self.tickPosition() != self.NoTicks:
[4992ff2]	161	opt.subControls \|= QtWidgets.QStyle.SC_SliderTickmarks
[5d89f43]	162
	163	if self.pressed_control:
	164	opt.activeSubControls = self.pressed_control
[4992ff2]	165	opt.state \|= QtWidgets.QStyle.State_Sunken
[5d89f43]	166	else:
	167	opt.activeSubControls = self.hover_control
	168
[4992ff2]	169	style.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt, painter, self)
[5d89f43]	170
	171
	172	def mousePressEvent(self, event):
	173	event.accept()
	174
[7969b9c]	175	style = QtWidgets.QApplication.style()
[5d89f43]	176	button = event.button()
	177
	178	# In a normal slider control, when the user clicks on a point in the
	179	# slider's total range, but not on the slider part of the control the
	180	# control would jump the slider value to where the user clicked.
	181	# For this control, clicks which are not direct hits will slide both
	182	# slider parts
	183
	184	if button:
[4992ff2]	185	opt = QtWidgets.QStyleOptionSlider()
[5d89f43]	186	self.initStyleOption(opt)
	187
	188	self.active_slider = 0
	189	mid = (self.maximum() - self.minimum()) / 2.0
	190
	191	for i, value in enumerate([self._low, self._high]):
	192	opt.sliderPosition = value
	193	hit = style.hitTestComplexControl(style.CC_Slider, opt, event.pos(), self)
	194
	195	if hit == style.SC_SliderHandle:
	196	self.pressed_control = hit
	197
	198	# if both handles are close together, avoid locks
	199	# choosing the one with more empty space near it
	200	if self._low + 2 >= self._high:
	201	self.active_slider = 1 if self._high < mid else -1
	202	else:
	203	self.active_slider = -1 if i == 0 else 1
	204	self.triggerAction(self.SliderMove)
	205	self.setRepeatAction(self.SliderNoAction)
	206	self.setSliderDown(True)
	207	break
	208
	209	if self.active_slider == 0:
[4992ff2]	210	self.pressed_control = QtWidgets.QStyle.SC_SliderHandle
[5d89f43]	211	self.click_offset = self.__pixelPosToRangeValue(self.__pick(event.pos()))
	212	self.triggerAction(self.SliderMove)
	213	self.setRepeatAction(self.SliderNoAction)
	214	self.setSliderDown(True)
	215	else:
	216	event.ignore()
	217
	218	def mouseReleaseEvent(self, event):
[4992ff2]	219	if self.pressed_control != QtWidgets.QStyle.SC_SliderHandle:
[5d89f43]	220	event.ignore()
	221	return
	222
	223	self.setSliderDown(False)
[4992ff2]	224	return QtWidgets.QSlider.mouseReleaseEvent(self, event)
[5d89f43]	225
	226	def mouseMoveEvent(self, event):
[4992ff2]	227	if self.pressed_control != QtWidgets.QStyle.SC_SliderHandle:
[5d89f43]	228	event.ignore()
	229	return
	230
	231	event.accept()
	232	new_pos = self.__pixelPosToRangeValue(self.__pick(event.pos()))
[4992ff2]	233	opt = QtWidgets.QStyleOptionSlider()
[5d89f43]	234	self.initStyleOption(opt)
	235
	236	old_click_offset = self.click_offset
	237	self.click_offset = new_pos
	238
	239	if self.active_slider == 0:
	240	offset = new_pos - old_click_offset
	241	new_low = self._low + offset
	242	new_high = self._high + offset
	243
	244	if new_low < self.minimum():
	245	diff = self.minimum() - new_low
	246	new_low += diff
	247	new_high += diff
	248	if new_high > self.maximum():
	249	diff = self.maximum() - new_high
	250	new_low += diff
	251	new_high += diff
	252
	253	self.setLowValue( new_low )
	254	self.setHighValue( new_high )
	255
	256	elif self.active_slider < 0:
	257	if new_pos > self._high:
	258	new_pos = self._high
	259	self.setLowValue( new_pos )
	260
	261	else:
	262	if new_pos < self._low:
	263	new_pos = self._low
	264	self.setHighValue( new_pos )
	265
	266
	267	def __pick(self, pt):
	268	if self.orientation() == QtCore.Qt.Horizontal:
	269	return pt.x()
	270	else:
	271	return pt.y()
	272
	273
	274	def __pixelPosToRangeValue(self, pos):
[4992ff2]	275	opt = QtWidgets.QStyleOptionSlider()
[5d89f43]	276	self.initStyleOption(opt)
[7969b9c]	277	style = QtWidgets.QApplication.style()
[5d89f43]	278
	279	gr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderGroove, self)
	280	sr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderHandle, self)
	281
	282	if self.orientation() == QtCore.Qt.Horizontal:
	283	handle_length = sr.width()
	284	slider_min = gr.x() + handle_length/2
	285	slider_max = gr.right() - handle_length/2 + 1
	286	else:
	287	handle_length = sr.height()
	288	slider_min = gr.y() + handle_length/2
	289	slider_max = gr.bottom() - handle_length/2 + 1
	290
	291	return self.minimum() + style.sliderValueFromPosition(0, self.maximum()-self.minimum(),
	292	pos-slider_min, slider_max - slider_min,
	293	opt.upsideDown)

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source: sasview/src/sas/qtgui/Plotting/rangeSlider.py @ 441a03f

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