pyqtgraph/examples/ExampleApp.py

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import keyword
import os
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import re
import sys
import subprocess
from argparse import Namespace
import pyqtgraph as pg
from pyqtgraph.Qt import QtWidgets, QtGui, QtCore, QT_LIB
from collections import OrderedDict
from .utils import examples_
from functools import lru_cache
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
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QRegularExpression = QtCore.QRegularExpression
QFont = QtGui.QFont
QColor = QtGui.QColor
QTextCharFormat = QtGui.QTextCharFormat
QSyntaxHighlighter = QtGui.QSyntaxHighlighter
def charFormat(color, style='', background=None):
"""
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.Weight.Bold)
if 'italic' in style:
_format.setFontItalic(True)
if background is not None:
_format.setBackground(pg.mkColor(background))
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': charFormat(LightThemeColors.Blue, 'bold'),
'operator': charFormat(LightThemeColors.Red, 'bold'),
'brace': charFormat(LightThemeColors.Purple),
'defclass': charFormat(LightThemeColors.Indigo, 'bold'),
'string': charFormat(LightThemeColors.Amber),
'string2': charFormat(LightThemeColors.DeepPurple),
'comment': charFormat(LightThemeColors.Green, 'italic'),
'self': charFormat(LightThemeColors.Blue, 'bold'),
'numbers': charFormat(LightThemeColors.Teal),
}
DARK_STYLES = {
'keyword': charFormat(DarkThemeColors.Blue, 'bold'),
'operator': charFormat(DarkThemeColors.Red, 'bold'),
'brace': charFormat(DarkThemeColors.Purple),
'defclass': charFormat(DarkThemeColors.Indigo, 'bold'),
'string': charFormat(DarkThemeColors.Amber),
'string2': charFormat(DarkThemeColors.DeepPurple),
'comment': charFormat(DarkThemeColors.Green, 'italic'),
'self': charFormat(DarkThemeColors.Blue, 'bold'),
'numbers': charFormat(DarkThemeColors.Teal),
}
class PythonHighlighter(QSyntaxHighlighter):
"""Syntax highlighter for the Python language.
"""
# Python keywords
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keywords = keyword.kwlist
# Python operators
operators = [
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r'=',
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# Comparison
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r'==', r'!=', r'<', r'<=', r'>', r'>=',
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# Arithmetic
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r'\+', r"-", r'\*', r'/', r'//', r'%', r'\*\*',
# In-place
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r'\+=', r'-=', r'\*=', r'/=', r'\%=',
# Bitwise
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r'\^', r'\|', r'&', r'~', r'>>', r'<<',
]
# Python braces
braces = [
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r'\{', r'\}', r'\(', r'\)', r'\[', r'\]',
]
def __init__(self, document):
super().__init__(document)
# Multi-line strings (expression, flag, style)
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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]
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rules += [(o, 0, 'operator')
for o in PythonHighlighter.operators]
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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'),
]
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self.rules = rules
self.searchText = None
@property
def styles(self):
app = QtWidgets.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
rules = self.rules.copy()
for expression, nth, format in rules:
format = self.styles[format]
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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.applySearchHighlight(text)
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):
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"""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:
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match = delimiter.match(text)
start = match.capturedStart()
# Move past this match
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add = match.capturedLength()
# As long as there's a delimiter match on this line...
while start >= 0:
# Look for the ending delimiter
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match = delimiter.match(text, start + add)
end = match.capturedEnd()
# Ending delimiter on this line?
if end >= add:
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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])
# Highlighting sits on top of this formatting
# Look for the next match
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match = delimiter.match(text, start + length)
start = match.capturedStart()
self.applySearchHighlight(text)
# Return True if still inside a multi-line string, False otherwise
if self.currentBlockState() == in_state:
return True
else:
return False
def applySearchHighlight(self, text):
if not self.searchText:
return
expr = f'(?i){self.searchText}'
palette: QtGui.QPalette = app.palette()
color = palette.highlight().color()
fgndColor = palette.color(palette.ColorGroup.Current,
palette.ColorRole.Text).name()
style = charFormat(fgndColor, background=color.name())
for match in re.finditer(expr, text):
start = match.start()
length = match.end() - start
self.setFormat(start, length, style)
def unnestedDict(exDict):
"""Converts a dict-of-dicts to a singly nested dict for non-recursive parsing"""
out = {}
for kk, vv in exDict.items():
if isinstance(vv, dict):
out.update(unnestedDict(vv))
else:
out[kk] = vv
return out
class ExampleLoader(QtWidgets.QMainWindow):
def __init__(self):
QtWidgets.QMainWindow.__init__(self)
self.ui = ui_template.Ui_Form()
self.cw = QtWidgets.QWidget()
self.setCentralWidget(self.cw)
self.ui.setupUi(self.cw)
self.setWindowTitle("PyQtGraph Examples")
self.codeBtn = QtWidgets.QPushButton('Run Edited Code')
self.codeLayout = QtWidgets.QGridLayout()
self.ui.codeView.setLayout(self.codeLayout)
self.hl = PythonHighlighter(self.ui.codeView.document())
app = QtWidgets.QApplication.instance()
app.paletteChanged.connect(self.updateTheme)
policy = QtWidgets.QSizePolicy.Policy.Expanding
self.codeLayout.addItem(QtWidgets.QSpacerItem(100,100, policy, policy), 0, 0)
self.codeLayout.addWidget(self.codeBtn, 1, 1)
self.codeBtn.hide()
textFil = self.ui.exampleFilter
self.curListener = None
self.ui.exampleFilter.setFocus()
def onComboChanged(searchType):
if self.curListener is not None:
self.curListener.disconnect()
self.curListener = textFil.textChanged
if searchType == 'Content Search':
self.curListener.connect(self.filterByContent)
else:
self.hl.searchText = None
self.curListener.connect(self.filterByTitle)
# Fire on current text, too
self.curListener.emit(textFil.text())
self.ui.searchFiles.currentTextChanged.connect(onComboChanged)
onComboChanged(self.ui.searchFiles.currentText())
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)
# textChanged fires when the highlighter is reassigned the same document. Prevent this
# from showing "run edited code" by checking for actual content change
oldText = self.ui.codeView.toPlainText()
def onTextChange():
nonlocal oldText
newText = self.ui.codeView.toPlainText()
if newText != oldText:
oldText = newText
self.codeEdited()
self.ui.codeView.textChanged.connect(onTextChange)
self.codeBtn.clicked.connect(self.runEditedCode)
def filterByTitle(self, text):
self.showExamplesByTitle(self.getMatchingTitles(text))
self.hl.setDocument(self.ui.codeView.document())
def filterByContent(self, text=None):
# Don't filter very short strings
checkDict = unnestedDict(examples_)
self.hl.searchText = text
# Need to reapply to current document
self.hl.setDocument(self.ui.codeView.document())
titles = []
text = text.lower()
for kk, vv in checkDict.items():
if isinstance(vv, Namespace):
vv = vv.filename
filename = os.path.join(path, vv)
contents = self.getExampleContent(filename).lower()
if text in contents:
titles.append(kk)
self.showExamplesByTitle(titles)
def getMatchingTitles(self, text, exDict=None, acceptAll=False):
if exDict is None:
exDict = examples_
text = text.lower()
titles = []
for kk, vv in exDict.items():
matched = acceptAll or text in kk.lower()
if isinstance(vv, dict):
titles.extend(self.getMatchingTitles(text, vv, acceptAll=matched))
elif matched:
titles.append(kk)
return titles
def showExamplesByTitle(self, titles):
QTWI = QtWidgets.QTreeWidgetItemIterator
flag = QTWI.IteratorFlag.NoChildren
treeIter = QTWI(self.ui.exampleTree, flag)
item = treeIter.value()
while item is not None:
parent = item.parent()
show = (item.childCount() or item.text(0) in titles)
item.setHidden(not show)
# If all children of a parent are gone, hide it
if parent:
hideParent = True
for ii in range(parent.childCount()):
if not parent.child(ii).isHidden():
hideParent = False
break
parent.setHidden(hideParent)
treeIter += 1
item = treeIter.value()
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.ColorGroup.Active, QtGui.QPalette.ColorRole.Base, c)
p.setColor(QtGui.QPalette.ColorGroup.Inactive, QtGui.QPalette.ColorRole.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 = QtWidgets.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 = QtWidgets.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'):
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
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subprocess.Popen([sys.executable, fn], env=env)
def showFile(self):
fn = self.currentFile()
text = self.getExampleContent(fn)
self.ui.codeView.setPlainText(text)
self.ui.loadedFileLabel.setText(fn)
self.codeBtn.hide()
@lru_cache(100)
def getExampleContent(self, filename):
if filename is None:
self.ui.codeView.clear()
return
if os.path.isdir(filename):
filename = os.path.join(filename, '__main__.py')
with open(filename, "r") as currentFile:
text = currentFile.read()
return text
def codeEdited(self):
self.codeBtn.show()
def runEditedCode(self):
self.loadFile(edited=True)
def keyPressEvent(self, event):
ret = super().keyPressEvent(event)
if not QtCore.Qt.KeyboardModifier.ControlModifier & event.modifiers():
return ret
key = event.key()
Key = QtCore.Qt.Key
# Allow quick navigate to search
if key == Key.Key_F:
self.ui.exampleFilter.setFocus()
event.accept()
return
if key not in [Key.Key_Plus, Key.Key_Minus, Key.Key_Underscore, Key.Key_Equal, Key.Key_0]:
return ret
font = self.ui.codeView.font()
oldSize = font.pointSize()
if key == Key.Key_Plus or key == Key.Key_Equal:
font.setPointSize(oldSize + max(oldSize*.15, 1))
elif key == Key.Key_Minus or key == Key.Key_Underscore:
newSize = oldSize - max(oldSize*.15, 1)
font.setPointSize(max(newSize, 1))
elif key == Key.Key_0:
# Reset to original size
font.setPointSize(10)
self.ui.codeView.setFont(font)
event.accept()
def main():
app = pg.mkQApp()
loader = ExampleLoader()
loader.ui.exampleTree.setCurrentIndex(
loader.ui.exampleTree.model().index(0,0)
)
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pg.exec()
if __name__ == '__main__':
main()