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pyqtgraph/examples/ExampleApp.py
KIU Shueng Chuan e09a397ebc modify environment to choose binding 
the Example App allows the user to choose a binding and a graphics
system to use to execute an example.

issue 1: setGraphicsSystem is obsolete and the method no longer exists.
thus selecting a graphics system causes an error.

issue 2: the choice of binding to use is passed as an extra command
line argument to be parsed by initExample. this is problematic for
examples that use argparse, such as VideoSpeedTest.py

issue 3: if the user has set PYQTGRAPH_QT_LIB, that takes precedence
over the choice made in the Example App.

this patch fixes the above 3 issues by setting PYQTGRAPH_QT_LIB in
the child process' environment and removing the old parsing of the
command line arguments
2021-02-22 18:13:49 +08:00

400 lines
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import keyword
import os
import re
import sys
import subprocess
from argparse import Namespace
import pyqtgraph as pg
from pyqtgraph.Qt import QtGui, QtCore, QT_LIB
from collections import OrderedDict
from .utils import examples
path = os.path.abspath(os.path.dirname(__file__))
sys.path.insert(0, path)
app = pg.mkQApp()
import importlib
ui_template = importlib.import_module(
f'exampleLoaderTemplate_{QT_LIB.lower()}')
# based on https://github.com/art1415926535/PyQt5-syntax-highlighting
QRegularExpression = QtCore.QRegularExpression
QFont = QtGui.QFont
QColor = QtGui.QColor
QTextCharFormat = QtGui.QTextCharFormat
QSyntaxHighlighter = QtGui.QSyntaxHighlighter
def format(color, style=''):
"""
Return a QTextCharFormat with the given attributes.
"""
_color = QColor()
if type(color) is not str:
_color.setRgb(color[0], color[1], color[2])
else:
_color.setNamedColor(color)
_format = QTextCharFormat()
_format.setForeground(_color)
if 'bold' in style:
_format.setFontWeight(QFont.Bold)
if 'italic' in style:
_format.setFontItalic(True)
return _format
class LightThemeColors:
Red = "#B71C1C"
Pink = "#FCE4EC"
Purple = "#4A148C"
DeepPurple = "#311B92"
Indigo = "#1A237E"
Blue = "#0D47A1"
LightBlue = "#01579B"
Cyan = "#006064"
Teal = "#004D40"
Green = "#1B5E20"
LightGreen = "#33691E"
Lime = "#827717"
Yellow = "#F57F17"
Amber = "#FF6F00"
Orange = "#E65100"
DeepOrange = "#BF360C"
Brown = "#3E2723"
Grey = "#212121"
BlueGrey = "#263238"
class DarkThemeColors:
Red = "#F44336"
Pink = "#F48FB1"
Purple = "#CE93D8"
DeepPurple = "#B39DDB"
Indigo = "#9FA8DA"
Blue = "#90CAF9"
LightBlue = "#81D4FA"
Cyan = "#80DEEA"
Teal = "#80CBC4"
Green = "#A5D6A7"
LightGreen = "#C5E1A5"
Lime = "#E6EE9C"
Yellow = "#FFF59D"
Amber = "#FFE082"
Orange = "#FFCC80"
DeepOrange = "#FFAB91"
Brown = "#BCAAA4"
Grey = "#EEEEEE"
BlueGrey = "#B0BEC5"
LIGHT_STYLES = {
'keyword': format(LightThemeColors.Blue, 'bold'),
'operator': format(LightThemeColors.Red, 'bold'),
'brace': format(LightThemeColors.Purple),
'defclass': format(LightThemeColors.Indigo, 'bold'),
'string': format(LightThemeColors.Amber),
'string2': format(LightThemeColors.DeepPurple),
'comment': format(LightThemeColors.Green, 'italic'),
'self': format(LightThemeColors.Blue, 'bold'),
'numbers': format(LightThemeColors.Teal),
}
DARK_STYLES = {
'keyword': format(DarkThemeColors.Blue, 'bold'),
'operator': format(DarkThemeColors.Red, 'bold'),
'brace': format(DarkThemeColors.Purple),
'defclass': format(DarkThemeColors.Indigo, 'bold'),
'string': format(DarkThemeColors.Amber),
'string2': format(DarkThemeColors.DeepPurple),
'comment': format(DarkThemeColors.Green, 'italic'),
'self': format(DarkThemeColors.Blue, 'bold'),
'numbers': format(DarkThemeColors.Teal),
}
class PythonHighlighter(QSyntaxHighlighter):
"""Syntax highlighter for the Python language.
"""
# Python keywords
keywords = keyword.kwlist
# Python operators
operators = [
r'=',
# Comparison
r'==', r'!=', r'<', r'<=', r'>', r'>=',
# Arithmetic
r'\+', r"-", r'\*', r'/', r'//', r'%', r'\*\*',
# In-place
r'\+=', r'-=', r'\*=', r'/=', r'\%=',
# Bitwise
r'\^', r'\|', r'&', r'~', r'>>', r'<<',
]
# Python braces
braces = [
r'\{', r'\}', r'\(', r'\)', r'\[', r'\]',
]
def __init__(self, document):
QSyntaxHighlighter.__init__(self, document)
# Multi-line strings (expression, flag, style)
self.tri_single = (QRegularExpression("'''"), 1, 'string2')
self.tri_double = (QRegularExpression('"""'), 2, 'string2')
rules = []
# Keyword, operator, and brace rules
rules += [(r'\b%s\b' % w, 0, 'keyword')
for w in PythonHighlighter.keywords]
rules += [(o, 0, 'operator')
for o in PythonHighlighter.operators]
rules += [(b, 0, 'brace')
for b in PythonHighlighter.braces]
# All other rules
rules += [
# 'self'
(r'\bself\b', 0, 'self'),
# 'def' followed by an identifier
(r'\bdef\b\s*(\w+)', 1, 'defclass'),
# 'class' followed by an identifier
(r'\bclass\b\s*(\w+)', 1, 'defclass'),
# Numeric literals
(r'\b[+-]?[0-9]+[lL]?\b', 0, 'numbers'),
(r'\b[+-]?0[xX][0-9A-Fa-f]+[lL]?\b', 0, 'numbers'),
(r'\b[+-]?[0-9]+(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b', 0, 'numbers'),
# Double-quoted string, possibly containing escape sequences
(r'"[^"\\]*(\\.[^"\\]*)*"', 0, 'string'),
# Single-quoted string, possibly containing escape sequences
(r"'[^'\\]*(\\.[^'\\]*)*'", 0, 'string'),
# From '#' until a newline
(r'#[^\n]*', 0, 'comment'),
]
self.rules = rules
@property
def styles(self):
app = QtGui.QApplication.instance()
return DARK_STYLES if app.property('darkMode') else LIGHT_STYLES
def highlightBlock(self, text):
"""Apply syntax highlighting to the given block of text.
"""
# Do other syntax formatting
for expression, nth, format in self.rules:
format = self.styles[format]
for n, match in enumerate(re.finditer(expression, text)):
if n < nth:
continue
start = match.start()
length = match.end() - start
self.setFormat(start, length, format)
self.setCurrentBlockState(0)
# Do multi-line strings
in_multiline = self.match_multiline(text, *self.tri_single)
if not in_multiline:
in_multiline = self.match_multiline(text, *self.tri_double)
def match_multiline(self, text, delimiter, in_state, style):
"""Do highlighting of multi-line strings.
=========== ==========================================================
delimiter (QRegularExpression) for triple-single-quotes or
triple-double-quotes
in_state (int) to represent the corresponding state changes when
inside those strings. Returns True if we're still inside a
multi-line string when this function is finished.
style (str) representation of the kind of style to use
=========== ==========================================================
"""
# If inside triple-single quotes, start at 0
if self.previousBlockState() == in_state:
start = 0
add = 0
# Otherwise, look for the delimiter on this line
else:
match = delimiter.match(text)
start = match.capturedStart()
# Move past this match
add = match.capturedLength()
# As long as there's a delimiter match on this line...
while start >= 0:
# Look for the ending delimiter
match = delimiter.match(text, start + add)
end = match.capturedEnd()
# Ending delimiter on this line?
if end >= add:
length = end - start + add + match.capturedLength()
self.setCurrentBlockState(0)
# No; multi-line string
else:
self.setCurrentBlockState(in_state)
length = len(text) - start + add
# Apply formatting
self.setFormat(start, length, self.styles[style])
# Look for the next match
match = delimiter.match(text, start + length)
start = match.capturedStart()
# Return True if still inside a multi-line string, False otherwise
if self.currentBlockState() == in_state:
return True
else:
return False
class ExampleLoader(QtGui.QMainWindow):
def __init__(self):
QtGui.QMainWindow.__init__(self)
self.ui = ui_template.Ui_Form()
self.cw = QtGui.QWidget()
self.setCentralWidget(self.cw)
self.ui.setupUi(self.cw)
self.setWindowTitle("PyQtGraph Examples")
self.codeBtn = QtGui.QPushButton('Run Edited Code')
self.codeLayout = QtGui.QGridLayout()
self.ui.codeView.setLayout(self.codeLayout)
self.hl = PythonHighlighter(self.ui.codeView.document())
app = QtGui.QApplication.instance()
app.paletteChanged.connect(self.updateTheme)
self.codeLayout.addItem(QtGui.QSpacerItem(100,100,QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding), 0, 0)
self.codeLayout.addWidget(self.codeBtn, 1, 1)
self.codeBtn.hide()
global examples
self.itemCache = []
self.populateTree(self.ui.exampleTree.invisibleRootItem(), examples)
self.ui.exampleTree.expandAll()
self.resize(1000,500)
self.show()
self.ui.splitter.setSizes([250,750])
self.ui.loadBtn.clicked.connect(self.loadFile)
self.ui.exampleTree.currentItemChanged.connect(self.showFile)
self.ui.exampleTree.itemDoubleClicked.connect(self.loadFile)
self.ui.codeView.textChanged.connect(self.codeEdited)
self.codeBtn.clicked.connect(self.runEditedCode)
def simulate_black_mode(self):
"""
used to simulate MacOS "black mode" on other platforms
intended for debug only, as it manage only the QPlainTextEdit
"""
# first, a dark background
c = QtGui.QColor('#171717')
p = self.ui.codeView.palette()
p.setColor(QtGui.QPalette.Active, QtGui.QPalette.Base, c)
p.setColor(QtGui.QPalette.Inactive, QtGui.QPalette.Base, c)
self.ui.codeView.setPalette(p)
# then, a light font
f = QtGui.QTextCharFormat()
f.setForeground(QtGui.QColor('white'))
self.ui.codeView.setCurrentCharFormat(f)
# finally, override application automatic detection
app = QtGui.QApplication.instance()
app.setProperty('darkMode', True)
def updateTheme(self):
self.hl = PythonHighlighter(self.ui.codeView.document())
def populateTree(self, root, examples):
bold_font = None
for key, val in examples.items():
item = QtGui.QTreeWidgetItem([key])
self.itemCache.append(item) # PyQt 4.9.6 no longer keeps references to these wrappers,
# so we need to make an explicit reference or else the .file
# attribute will disappear.
if isinstance(val, OrderedDict):
self.populateTree(item, val)
elif isinstance(val, Namespace):
item.file = val.filename
if 'recommended' in val:
if bold_font is None:
bold_font = item.font(0)
bold_font.setBold(True)
item.setFont(0, bold_font)
else:
item.file = val
root.addChild(item)
def currentFile(self):
item = self.ui.exampleTree.currentItem()
if hasattr(item, 'file'):
global path
return os.path.join(path, item.file)
return None
def loadFile(self, edited=False):
qtLib = str(self.ui.qtLibCombo.currentText())
env = None
if qtLib != 'default':
env = dict(os.environ, PYQTGRAPH_QT_LIB=qtLib)
if edited:
path = os.path.abspath(os.path.dirname(__file__))
proc = subprocess.Popen([sys.executable, '-'], stdin=subprocess.PIPE, cwd=path, env=env)
code = str(self.ui.codeView.toPlainText()).encode('UTF-8')
proc.stdin.write(code)
proc.stdin.close()
else:
fn = self.currentFile()
if fn is None:
return
if sys.platform.startswith('win'):
args = [os.P_NOWAIT, sys.executable, '"'+sys.executable+'"', '"' + fn + '"']
else:
args = [os.P_NOWAIT, sys.executable, sys.executable, fn]
if env is None:
os.spawnl(*args)
else:
args.append(env)
os.spawnle(*args)
def showFile(self):
fn = self.currentFile()
if fn is None:
self.ui.codeView.clear()
return
if os.path.isdir(fn):
fn = os.path.join(fn, '__main__.py')
text = open(fn).read()
self.ui.codeView.setPlainText(text)
self.ui.loadedFileLabel.setText(fn)
self.codeBtn.hide()
def codeEdited(self):
self.codeBtn.show()
def runEditedCode(self):
self.loadFile(edited=True)
def main():
app = pg.mkQApp()
loader = ExampleLoader()
app.exec_()
# or condition so pytest runs ExampleApp as part of test suite
if __name__ == '__main__':
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
main()
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