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# -*- coding: utf-8 -*-
#
# AWL simulator - Generic source code edit widget
#
# Copyright 2014 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
from awlsim.common.compat import *
from awlsim.gui.util import *
class SourceCodeEdit(QPlainTextEdit):
# Signal: Change the font size.
# If the parameter is True, increase font size.
resizeFont = Signal(bool)
def __init__(self, parent=None):
QPlainTextEdit.__init__(self, parent)
self.__wheelSteps = 0.0
self.__undoIsAvailable = False
self.__redoIsAvailable = False
self.__copyIsAvailable = False
self.__prevLineNr = self.textCursor().blockNumber()
self.__prevColumnNr = self.textCursor().columnNumber()
self.__columnChange = False
self.enableAutoIndent()
self.enablePasteIndent()
self.__validateEn = True
self.__prevErrLines = ()
self.cursorPositionChanged.connect(self.__handleCursorChange)
self.undoAvailable.connect(self.__handleUndoAvailableChange)
self.redoAvailable.connect(self.__handleRedoAvailableChange)
self.copyAvailable.connect(self.__handleCopyAvailableChange)
def __handleUndoAvailableChange(self, available):
self.__undoIsAvailable = available
def undoIsAvailable(self):
return self.__undoIsAvailable
def __handleRedoAvailableChange(self, available):
self.__redoIsAvailable = available
def redoIsAvailable(self):
return self.__redoIsAvailable
def __handleCopyAvailableChange(self, available):
self.__copyIsAvailable = available
def copyIsAvailable(self):
return self.__copyIsAvailable
def enableAutoIndent(self, enable=True):
self.__autoIndentEn = enable
def enablePasteIndent(self, enable=True):
self.__pasteIndentEn = enable
def enableValidation(self, enable=True):
self.__validateEn = enable
self.setErraticLines(())
self.__validate()
def __getLineIndent(self, cursor):
cursor.select(QTextCursor.LineUnderCursor)
line = cursor.selectedText()
if not line:
return ""
# Get the indent-string (that is the whitespace line prefix)
for i, c in enumerate(line):
if not c.isspace():
break
else:
i += 1
return line[:i]
def __autoIndentHandleNewline(self):
if not self.__autoIndentEn:
return
# Move cursor to previous line and get its indent string.
cursor = self.textCursor()
if not cursor.movePosition(QTextCursor.Up,
QTextCursor.MoveAnchor, 1):
return
indentStr = self.__getLineIndent(cursor)
# Insert the indent string into the current line
cursor = self.textCursor()
cursor.insertText(indentStr)
self.setTextCursor(cursor)
# Remove any old indent (righthand of the cursor)
cursor = self.textCursor()
if not cursor.movePosition(QTextCursor.EndOfLine,
QTextCursor.KeepAnchor, 1):
return
selText = cursor.selectedText()
stripCount = len(selText) - len(selText.lstrip())
if stripCount > 0:
cursor = self.textCursor()
if not cursor.movePosition(QTextCursor.Right,
QTextCursor.KeepAnchor,
stripCount):
return
cursor.deleteChar()
def keyPressEvent(self, ev):
QPlainTextEdit.keyPressEvent(self, ev)
if ev.key() in (Qt.Key_Return, Qt.Key_Enter):
self.__autoIndentHandleNewline()
elif ev.key() == Qt.Key_Delete:
self.__validate()
def wheelEvent(self, ev):
if ev.modifiers() & Qt.ControlModifier:
# Ctrl + Scroll-wheel: Font resizing
if isQt4:
numDegrees = ev.delta() / 8
else:
numDegrees = ev.angleDelta().y() / 8
numSteps = numDegrees / 15
self.__wheelSteps += numSteps
if self.__wheelSteps >= 1.0:
while self.__wheelSteps >= 1.0:
self.resizeFont.emit(False)
self.__wheelSteps -= 1.0
elif self.__wheelSteps <= -1.0:
while self.__wheelSteps <= -1.0:
self.resizeFont.emit(True)
self.__wheelSteps += 1.0
return
else:
self.__wheelSteps = 0.0
QPlainTextEdit.wheelEvent(self, ev)
# Add the current indent to all lines (except the first) in 'text'.
def __makeSeamlessIndent(self, text):
indentStr = self.__getLineIndent(self.textCursor())
lines = []
for i, line in enumerate(text.splitlines()):
if i == 0:
lines.append(line)
else:
lines.append(indentStr + line)
return "\n".join(lines)
def pasteText(self, text):
if self.__autoIndentEn:
text = self.__makeSeamlessIndent(text)
self.insertPlainText(text)
def insertFromMimeData(self, mimeData):
if mimeData.hasText() and self.__pasteIndentEn:
# Replace the mimeData by a re-indented mimeData.
newText = self.__makeSeamlessIndent(mimeData.text())
mimeData = QMimeData()
mimeData.setText(newText)
QPlainTextEdit.insertFromMimeData(self, mimeData)
def __handleCursorChange(self):
cursor = self.textCursor()
columnNr = cursor.columnNumber()
lineNr = cursor.blockNumber()
if columnNr != self.__prevColumnNr:
self.__columnChange = True
if lineNr in self.__prevErrLines or\
(lineNr != self.__prevLineNr and\
self.__columnChange):
self.__validate()
self.__columnChange = False
self.__prevColumnNr = columnNr
self.__prevLineNr = lineNr
def setPlainText(self, text):
QPlainTextEdit.setPlainText(self, text)
self.__validate()
@staticmethod
def __makeExtraSel(cursor, format):
sel = QTextEdit.ExtraSelection()
sel.cursor = cursor
sel.format = format
return sel
@staticmethod
def __makeTextCursorLineSel(cursor, lineNr):
cursor.movePosition(QTextCursor.Start,
QTextCursor.MoveAnchor, 1)
cursor.movePosition(QTextCursor.Down,
QTextCursor.MoveAnchor, lineNr)
cursor.select(QTextCursor.LineUnderCursor)
return cursor
__errLineBrush = QBrush(QColor("#FFC0C0"))
def __validate(self):
if not self.__validateEn:
return
# Validate the current document
text = self.toPlainText()
if text.strip():
# Run the validator.
self.validateText(text, self.textCursor().blockNumber())
else:
# No text. Mark everything as ok.
self.setErraticLines(())
# Validation callback.
# Override this in the subclass.
# The default implementation marks everything as Ok.
# In case of validation failure, call setErraticLines.
def validateText(self, text, currentLineNr):
self.setErraticLines(())
# Mark erratic lines
def setErraticLines(self, errLines):
cursor = self.textCursor()
fmt = self.currentCharFormat()
fmt.setBackground(self.__errLineBrush)
extraSel = [
self.__makeExtraSel(self.__makeTextCursorLineSel(cursor, line),
fmt)
for line in errLines
]
self.setExtraSelections(extraSel)
self.__prevErrLines = errLines
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