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# Copyright (C) 2023 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtWidgets import (QDialog, QFileDialog,
QPlainTextEdit)
from PySide6.QtGui import QAction, QGuiApplication, QIcon, QKeySequence
from PySide6.QtCore import QDir, QFile, QTextStream, Qt, Slot
from abstractviewer import AbstractViewer
class TxtViewer(AbstractViewer):
def __init__(self):
super().__init__()
self.uiInitialized.connect(self.setupTxtUi)
def init(self, file, parent, mainWindow):
self._textEdit = QPlainTextEdit(parent)
super().init(file, self._textEdit, mainWindow)
def viewerName(self):
return "TxtViewer"
def supportedMimeTypes(self):
return ["text/plain"]
@Slot()
def setupTxtUi(self):
editMenu = self.addMenu("Edit")
editToolBar = self.addToolBar("Edit")
cutIcon = QIcon.fromTheme(QIcon.ThemeIcon.EditCut,
QIcon(":/demos/documentviewer/images/cut.png"))
cutAct = QAction(cutIcon, "Cut", self)
cutAct.setShortcuts(QKeySequence.Cut)
cutAct.setStatusTip("Cut the current selection's contents to the clipboard")
cutAct.triggered.connect(self._textEdit.cut)
editMenu.addAction(cutAct)
editToolBar.addAction(cutAct)
copyIcon = QIcon.fromTheme(QIcon.ThemeIcon.EditCopy,
QIcon(":/demos/documentviewer/images/copy.png"))
copyAct = QAction(copyIcon, "Copy", self)
copyAct.setShortcuts(QKeySequence.Copy)
copyAct.setStatusTip("Copy the current selection's contents to the clipboard")
copyAct.triggered.connect(self._textEdit.copy)
editMenu.addAction(copyAct)
editToolBar.addAction(copyAct)
pasteIcon = QIcon.fromTheme(QIcon.ThemeIcon.EditPaste,
QIcon(":/demos/documentviewer/images/paste.png"))
pasteAct = QAction(pasteIcon, "Paste", self)
pasteAct.setShortcuts(QKeySequence.Paste)
pasteAct.setStatusTip("Paste the clipboard's contents into the current selection")
pasteAct.triggered.connect(self._textEdit.paste)
editMenu.addAction(pasteAct)
editToolBar.addAction(pasteAct)
self.menuBar().addSeparator()
cutAct.setEnabled(False)
copyAct.setEnabled(False)
self._textEdit.copyAvailable.connect(cutAct.setEnabled)
self._textEdit.copyAvailable.connect(copyAct.setEnabled)
self.openFile()
self._textEdit.textChanged.connect(self._textChanged)
self._uiAssets_back.triggered.connect(self._back)
self._uiAssets_forward.triggered.connect(self._forward)
@Slot()
def _textChanged(self):
self.maybeSetPrintingEnabled(self.hasContent())
@Slot()
def _back(self):
bar = self._textEdit.verticalScrollBar()
if bar.value() > bar.minimum():
bar.setValue(bar.value() - 1)
@Slot()
def _forward(self):
bar = self._textEdit.verticalScrollBar()
if bar.value() < bar.maximum():
bar.setValue(bar.value() + 1)
def openFile(self):
type = "open"
file_name = QDir.toNativeSeparators(self._file.fileName())
if not self._file.open(QFile.ReadOnly | QFile.Text):
err = self._file.errorString()
self.statusMessage(f"Cannot read file {file_name}:\n{err}.", type)
return
in_str = QTextStream(self._file)
QGuiApplication.setOverrideCursor(Qt.WaitCursor)
if self._textEdit.toPlainText():
self._textEdit.clear()
self.disablePrinting()
self._textEdit.setPlainText(in_str.readAll())
QGuiApplication.restoreOverrideCursor()
self.statusMessage(f"File {file_name} loaded.", type)
self.maybeEnablePrinting()
def hasContent(self):
return bool(self._textEdit.toPlainText())
def printDocument(self, printer):
if not self.hasContent():
return
self._textEdit.print_(printer)
def saveFile(self, file):
file_name = QDir.toNativeSeparators(self._file.fileName())
errorMessage = ""
QGuiApplication.setOverrideCursor(Qt.WaitCursor)
if file.open(QFile.WriteOnly | QFile.Text):
out = QTextStream(file)
out << self._textEdit.toPlainText()
else:
error = file.errorString()
errorMessage = f"Cannot open file {file_name} for writing:\n{error}."
QGuiApplication.restoreOverrideCursor()
if errorMessage:
self.statusMessage(errorMessage)
return False
self.statusMessage(f"File {file_name} saved")
return True
def saveDocumentAs(self):
dialog = QFileDialog(self.mainWindow())
dialog.setWindowModality(Qt.WindowModal)
dialog.setAcceptMode(QFileDialog.AcceptSave)
if dialog.exec() != QDialog.Accepted:
return False
files = dialog.selectedFiles()
self._file.setFileName(files[0])
return self.saveDocument()
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