rangeSlider.py @ 6b43c58

Last change on this file since 6b43c58 was 83eb5208, checked in by Piotr Rozyczko <rozyczko@…>, 8 years ago
Putting files in more ordered fashion
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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 PyQt4 import QtGui, QtCore
26
27	class RangeSlider(QtGui.QSlider):
28	""" A slider for ranges.
29
30	This class provides a dual-slider for ranges, where there is a defined
31	maximum and minimum, as is a normal slider, but instead of having a
32	single slider value, there are 2 slider values.
33
34	This class emits the same signals as the QSlider base class, with the
35	exception of valueChanged.
36
37	In addition, two new signals are emitted to catch the movement of
38	each handle, lowValueChanged(int) and highValueChanged(int).
39	"""
40	highValueChanged = QtCore.pyqtSignal(int)
41	lowValueChanged = QtCore.pyqtSignal(int)
42	def __init__(self, *args):
43	super(RangeSlider, self).__init__(*args)
44
45	self._low = self.minimum()
46	self._high = self.maximum()
47
48	self.pressed_control = QtGui.QStyle.SC_None
49	self.hover_control = QtGui.QStyle.SC_None
50	self.click_offset = 0
51
52	# -1 for the low, 1 for the high, 0 for both
53	self.active_slider = -1
54
55	def lowValue(self):
56	return self._low
57
58	def setLowValue(self, low):
59	if low < self.minimum():
60	low = self.minimum()
61	if low == self._low:
62	return
63
64	self._low = low
65	self.update()
66
67	if self.hasTracking():
68	self.lowValueChanged.emit(self._low)
69
70	def highValue(self):
71	return self._high
72
73	def setHighValue(self, high):
74	if high > self.maximum():
75	high = self.maximum()
76	if high == self._high:
77	return
78
79	self._high = high
80	self.update()
81
82	if self.hasTracking():
83	self.lowValueChanged.emit(self._high)
84
85	def paintEvent(self, event):
86	# based on http://qt.gitorious.org/qt/qt/blobs/master/src/gui/widgets/qslider.cpp
87
88	painter = QtGui.QPainter(self)
89	style = QtGui.QApplication.style()
90
91	for i, value in enumerate([self._low, self._high]):
92	opt = QtGui.QStyleOptionSlider()
93	self.initStyleOption(opt)
94
95	gr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderGroove, self)
96	sr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderHandle, self)
97
98	if self.orientation() == QtCore.Qt.Horizontal:
99	handle_length = sr.width()
100	slider_length = gr.width()
101	slider_min = gr.x()
102	slider_max = gr.right() - handle_length + 1
103	else:
104	handle_length = sr.height()
105	slider_length = gr.height()
106	slider_min = gr.y()
107	slider_max = gr.bottom() - handle_length + 1
108
109	opt.subControls = QtGui.QStyle.SC_SliderGroove \| QtGui.QStyle.SC_SliderHandle
110
111	# draw the first slider with inverted appearance, then the second
112	# slider drawn on top of the existing ones
113	if i == 0:
114	if self.orientation() == QtCore.Qt.Horizontal:
115	opt.upsideDown = not self.invertedAppearance()
116	else:
117	opt.upsideDown = self.invertedAppearance()
118
119	if self.orientation() == QtCore.Qt.Horizontal:
120	opt.sliderValue = value - self.minimum()
121	opt.sliderPosition = self.minimum() + (self.maximum() - value)
122
123	opt.rect.setX(slider_min)
124	opt.rect.setWidth(slider_length)
125
126	else:
127	opt.rect.setY(slider_min)
128	opt.rect.setHeight(slider_length)
129
130	else:
131	# do not highlight the second part when has focus to avoid
132	# drawing of partially overlapped semi-transparent backgrounds
133	opt.state &= ~QtGui.QStyle.State_HasFocus
134
135	opt.sliderValue = 0
136	opt.sliderPosition = self.minimum()
137
138	if self.orientation() == QtCore.Qt.Horizontal:
139	opt.upsideDown = self.invertedAppearance()
140
141	pos = style.sliderPositionFromValue(0, self.maximum()-self.minimum(),
142	value-self.minimum(), slider_max - slider_min - 4,
143	opt.upsideDown)
144
145	opt.rect.setX(pos + 3)
146	opt.rect.setWidth(slider_max - pos + handle_length - 3)
147
148	else:
149	opt.upsideDown = not self.invertedAppearance()
150
151	pos = style.sliderPositionFromValue(0, self.maximum()-self.minimum(),
152	self.maximum()-value, slider_max - slider_min - 4,
153	opt.upsideDown)
154
155	opt.rect.setY(slider_min-1)
156	opt.rect.setHeight(slider_min + slider_length - pos - 2)
157
158	if self.tickPosition() != self.NoTicks:
159	opt.subControls \|= QtGui.QStyle.SC_SliderTickmarks
160
161	if self.pressed_control:
162	opt.activeSubControls = self.pressed_control
163	opt.state \|= QtGui.QStyle.State_Sunken
164	else:
165	opt.activeSubControls = self.hover_control
166
167	style.drawComplexControl(QtGui.QStyle.CC_Slider, opt, painter, self)
168
169
170	def mousePressEvent(self, event):
171	event.accept()
172
173	style = QtGui.QApplication.style()
174	button = event.button()
175
176	# In a normal slider control, when the user clicks on a point in the
177	# slider's total range, but not on the slider part of the control the
178	# control would jump the slider value to where the user clicked.
179	# For this control, clicks which are not direct hits will slide both
180	# slider parts
181
182	if button:
183	opt = QtGui.QStyleOptionSlider()
184	self.initStyleOption(opt)
185
186	self.active_slider = 0
187	mid = (self.maximum() - self.minimum()) / 2.0
188
189	for i, value in enumerate([self._low, self._high]):
190	opt.sliderPosition = value
191	hit = style.hitTestComplexControl(style.CC_Slider, opt, event.pos(), self)
192
193	if hit == style.SC_SliderHandle:
194	self.pressed_control = hit
195
196	# if both handles are close together, avoid locks
197	# choosing the one with more empty space near it
198	if self._low + 2 >= self._high:
199	self.active_slider = 1 if self._high < mid else -1
200	else:
201	self.active_slider = -1 if i == 0 else 1
202	self.triggerAction(self.SliderMove)
203	self.setRepeatAction(self.SliderNoAction)
204	self.setSliderDown(True)
205	break
206
207	if self.active_slider == 0:
208	self.pressed_control = QtGui.QStyle.SC_SliderHandle
209	self.click_offset = self.__pixelPosToRangeValue(self.__pick(event.pos()))
210	self.triggerAction(self.SliderMove)
211	self.setRepeatAction(self.SliderNoAction)
212	self.setSliderDown(True)
213	else:
214	event.ignore()
215
216	def mouseReleaseEvent(self, event):
217	if self.pressed_control != QtGui.QStyle.SC_SliderHandle:
218	event.ignore()
219	return
220
221	self.setSliderDown(False)
222	return QtGui.QSlider.mouseReleaseEvent(self, event)
223
224	def mouseMoveEvent(self, event):
225	if self.pressed_control != QtGui.QStyle.SC_SliderHandle:
226	event.ignore()
227	return
228
229	event.accept()
230	new_pos = self.__pixelPosToRangeValue(self.__pick(event.pos()))
231	opt = QtGui.QStyleOptionSlider()
232	self.initStyleOption(opt)
233
234	old_click_offset = self.click_offset
235	self.click_offset = new_pos
236
237	if self.active_slider == 0:
238	offset = new_pos - old_click_offset
239	new_low = self._low + offset
240	new_high = self._high + offset
241
242	if new_low < self.minimum():
243	diff = self.minimum() - new_low
244	new_low += diff
245	new_high += diff
246	if new_high > self.maximum():
247	diff = self.maximum() - new_high
248	new_low += diff
249	new_high += diff
250
251	self.setLowValue( new_low )
252	self.setHighValue( new_high )
253
254	elif self.active_slider < 0:
255	if new_pos > self._high:
256	new_pos = self._high
257	self.setLowValue( new_pos )
258
259	else:
260	if new_pos < self._low:
261	new_pos = self._low
262	self.setHighValue( new_pos )
263
264	if self.hasTracking():
265	self.emit(QtCore.SIGNAL('sliderMoved(int)'), new_pos)
266
267
268	def __pick(self, pt):
269	if self.orientation() == QtCore.Qt.Horizontal:
270	return pt.x()
271	else:
272	return pt.y()
273
274
275	def __pixelPosToRangeValue(self, pos):
276	opt = QtGui.QStyleOptionSlider()
277	self.initStyleOption(opt)
278	style = QtGui.QApplication.style()
279
280	gr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderGroove, self)
281	sr = style.subControlRect(style.CC_Slider, opt, style.SC_SliderHandle, self)
282
283	if self.orientation() == QtCore.Qt.Horizontal:
284	handle_length = sr.width()
285	slider_min = gr.x() + handle_length/2
286	slider_max = gr.right() - handle_length/2 + 1
287	else:
288	handle_length = sr.height()
289	slider_min = gr.y() + handle_length/2
290	slider_max = gr.bottom() - handle_length/2 + 1
291
292	return self.minimum() + style.sliderValueFromPosition(0, self.maximum()-self.minimum(),
293	pos-slider_min, slider_max - slider_min,
294	opt.upsideDown)

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SasView

source: sasview/src/sas/qtgui/Plotting/rangeSlider.py @ 6b43c58

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