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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from mimetypemodel import MimeTypeModel
from PySide6.QtCore import (QDir, QFileInfo, QMimeDatabase, QModelIndex, Qt,
Slot)
from PySide6.QtGui import QAction, QKeySequence
from PySide6.QtWidgets import (QAbstractItemView, QApplication, QDialog,
QFileDialog, QInputDialog, QMainWindow,
QMessageBox, QSplitter, QTextEdit, QTreeView,
QWidget)
class MainWindow(QMainWindow):
def __init__(self, parent: QWidget = None) -> None:
super().__init__(parent=parent)
self.m_find_index: int = 0
self.m_model = MimeTypeModel(self)
self.m_tree_view = QTreeView(self)
self.m_details_text = QTextEdit(self)
self.m_find_matches = []
self.setWindowTitle("Qt Mime Database Browser")
# create actions
self.detect_file_action = QAction(
"&Detect File Type...", self, shortcut="Ctrl+O", triggered=self.detect_file
)
self.exit_action = QAction("E&xit", self, shortcut="Ctrl+Q", triggered=self.close)
self.m_find_action = QAction("&Find...", self, shortcut="Ctrl+F", triggered=self.find)
self.m_find_next_action = QAction(
"Find &Next", self, shortcut="Ctrl+G", triggered=self.find_next
)
self.m_find_previous_action = QAction(
"Find &Previous",
self,
shortcut="Ctrl+Shift+G",
triggered=self.find_previous,
)
self.about_action = QAction(
"About Qt",
self,
shortcut=QKeySequence(QKeySequence.HelpContents),
triggered=QApplication.aboutQt,
)
# add action to menu
self.file_menu = self.menuBar().addMenu("&File")
self.file_menu.addAction(self.detect_file_action)
self.file_menu.addAction(self.exit_action)
self.find_menu = self.menuBar().addMenu("&Edit")
self.find_menu.addAction(self.m_find_action)
self.find_menu.addAction(self.m_find_next_action)
self.find_menu.addAction(self.m_find_previous_action)
self.about_menu = self.menuBar().addMenu("&About")
self.about_menu.addAction(self.about_action)
self.central_splitter = QSplitter(self)
self.setCentralWidget(self.central_splitter)
self.m_tree_view.setUniformRowHeights(True)
self.m_tree_view.setModel(self.m_model)
self.items = self.m_model.findItems(
"application/octet-stream",
Qt.MatchContains | Qt.MatchFixedString | Qt.MatchRecursive,
)
if self.items:
self.m_tree_view.expand(self.m_model.indexFromItem(self.items[0]))
self.m_tree_view.selectionModel().currentChanged.connect(self.current_changed)
self.central_splitter.addWidget(self.m_tree_view)
self.m_details_text.setReadOnly(True)
self.central_splitter.addWidget(self.m_details_text)
self.update_find_actions()
@Slot()
def detect_file(self):
file_name = QFileDialog.getOpenFileName(self, "Choose File")
if not file_name:
return
mime_database = QMimeDatabase()
fi = QFileInfo(file_name[0])
mime_type = mime_database.mimeTypeForFile(fi)
index = (
self.m_model.indexForMimeType(mime_type.name())
if mime_type.isValid()
else QModelIndex()
)
if index.isValid():
self.statusBar().showMessage(f'{fi.fileName()}" is of type "{mime_type.name()}"')
self._select_and_goto(index)
else:
QMessageBox.information(
self,
"Unknown File Type",
f"The type of {QDir.toNativeSeparators(file_name)} could not be determined.",
)
@Slot()
def find(self):
input_dialog = QInputDialog(self)
input_dialog.setWindowTitle("Find")
input_dialog.setLabelText("Text")
if input_dialog.exec() != QDialog.Accepted:
return
value = input_dialog.textValue().strip()
if not value:
return
self.m_find_matches.clear()
self.m_find_index = 0
items = self.m_model.findItems(
value, Qt.MatchContains | Qt.MatchFixedString | Qt.MatchRecursive
)
for item in items:
self.m_find_matches.append(self.m_model.indexFromItem(item))
self.statusBar().showMessage(f'{len(self.m_find_matches)} mime types match "{value}".')
self.update_find_actions()
if self.m_find_matches:
self._select_and_goto(self.m_find_matches[0])
@Slot()
def find_next(self):
self.m_find_index = self.m_find_index + 1
if self.m_find_index >= len(self.m_find_matches):
self.m_find_index = 0
if self.m_find_index < len(self.m_find_matches):
self._select_and_goto(self.m_find_matches[self.m_find_index])
@Slot()
def find_previous(self):
self.m_find_index = self.m_find_index - 1
if self.m_find_index < 0:
self.m_find_index = len(self.m_find_matches) - 1
if self.m_find_index >= 0:
self._select_and_goto(self.m_find_matches[self.m_find_index])
@Slot(QModelIndex)
def current_changed(self, index: QModelIndex):
if index.isValid():
self.m_details_text.setText(
MimeTypeModel.formatMimeTypeInfo(self.m_model.mimeType(index))
)
def update_find_actions(self):
self.find_next_previous_enabled = len(self.m_find_matches) > 1
self.m_find_next_action.setEnabled(self.find_next_previous_enabled)
self.m_find_previous_action.setEnabled(self.find_next_previous_enabled)
def _select_and_goto(self, index: QModelIndex):
self.m_tree_view.scrollTo(index, QAbstractItemView.PositionAtCenter)
self.m_tree_view.setCurrentIndex(index)
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