rangeSlider.py @ 5a2bb75

Last change on this file since 5a2bb75 was 7969b9c, checked in by Piotr Rozyczko <rozyczko@…>, 7 years ago
More functionality conversion
Property mode set to `100644`
File size: 11.0 KB

Line
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
25	from PyQt5 import QtCore
26	from PyQt5 import QtGui
27	from PyQt5 import QtWidgets
28
29	class RangeSlider(QtWidgets.QSlider):
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
50	self.pressed_control = QtWidgets.QStyle.SC_None
51	self.hover_control = QtWidgets.QStyle.SC_None
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)
91	style = QtWidgets.QApplication.style()
92
93	for i, value in enumerate([self._low, self._high]):
94	opt = QtWidgets.QStyleOptionSlider()
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
111	opt.subControls = QtWidgets.QStyle.SC_SliderGroove \| QtWidgets.QStyle.SC_SliderHandle
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
135	opt.state &= ~QtWidgets.QStyle.State_HasFocus
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:
161	opt.subControls \|= QtWidgets.QStyle.SC_SliderTickmarks
162
163	if self.pressed_control:
164	opt.activeSubControls = self.pressed_control
165	opt.state \|= QtWidgets.QStyle.State_Sunken
166	else:
167	opt.activeSubControls = self.hover_control
168
169	style.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt, painter, self)
170
171
172	def mousePressEvent(self, event):
173	event.accept()
174
175	style = QtWidgets.QApplication.style()
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:
185	opt = QtWidgets.QStyleOptionSlider()
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:
210	self.pressed_control = QtWidgets.QStyle.SC_SliderHandle
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):
219	if self.pressed_control != QtWidgets.QStyle.SC_SliderHandle:
220	event.ignore()
221	return
222
223	self.setSliderDown(False)
224	return QtWidgets.QSlider.mouseReleaseEvent(self, event)
225
226	def mouseMoveEvent(self, event):
227	if self.pressed_control != QtWidgets.QStyle.SC_SliderHandle:
228	event.ignore()
229	return
230
231	event.accept()
232	new_pos = self.__pixelPosToRangeValue(self.__pick(event.pos()))
233	opt = QtWidgets.QStyleOptionSlider()
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):
275	opt = QtWidgets.QStyleOptionSlider()
276	self.initStyleOption(opt)
277	style = QtWidgets.QApplication.style()
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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SasView

source: sasview/src/sas/qtgui/Plotting/rangeSlider.py @ 5a2bb75

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