Method openBigTextRoFile

src/cceditor/ccnotepad.cpp:4310–4396

大文本打开只读模式。20230126新增，这种模式打开时建立索引;todo:后续可多线程在后台建立索引

//大文本打开只读模式。20230126新增，这种模式打开时建立索引;todo:后续可多线程在后台建立索引
bool CCNotePad::openBigTextRoFile(QString filePath)
{
	QFileInfo fi(filePath);
	QString fileLabel(fi.fileName());

	//如果4M一个分块，则1024则是4G文件，2048则是8G文件。目前暂时最大支持8G的文件，进行文本编辑。
	BigTextEditFileMgr* txtFile = nullptr;

	RC_LINE_FORM lineEnd(UNKNOWN_LINE);

	if (!FileManager::getInstance().loadFileDataWithIndex(filePath, txtFile))
	{
		return false;
	}

	ScintillaEditView* pEdit = FileManager::getInstance().newEmptyDocument(true);
	pEdit->setReadOnly(true);
	pEdit->setNoteWidget(this);

	//必须要在editTabWidget->addTab之前，因为一旦add时会出发tabchange，其中没有doctype会导致错误
	pEdit->execute(SCI_SETSCROLLWIDTH, 80 * 10);
	setDocTypeProperty(pEdit, BIG_TEXT_RO_TYPE);

	showBigTextFile(pEdit, txtFile,0);

	lineEnd = (RC_LINE_FORM)txtFile->lineEndType;

	disconnect(ui.editTabWidget, &QTabWidget::currentChanged, this, &CCNotePad::slot_tabCurrentChanged);
	int curIndex = ui.editTabWidget->addTab(pEdit, QIcon((StyleSet::getCurrentSytleId() != DEEP_BLACK) ? TabNoNeedSave : TabNoNeedSaveDark32), getShortName(fileLabel));

	ui.editTabWidget->setCurrentIndex(curIndex);
	connect(ui.editTabWidget, &QTabWidget::currentChanged, this, &CCNotePad::slot_tabCurrentChanged, Qt::UniqueConnection);

	connect(pEdit, &ScintillaEditView::cursorPositionChanged, this, &CCNotePad::slot_LineNumIndexChange, Qt::QueuedConnection);

	autoSetDocLexer(pEdit);

	//pEdit->showBigEidTextLineNum(txtFile);

	QVariant editViewFilePath(filePath);
	pEdit->setProperty(Edit_View_FilePath, editViewFilePath);

	//setWindowTitle(QString("%1 (%2)").arg(filePath).arg(tr("Big Text File ReadOnly")));

	ui.editTabWidget->setTabToolTip(curIndex, filePath);

	QVariant editViewNewFile(-1);
	pEdit->setProperty(Edit_File_New, editViewNewFile);

	QVariant editTextChange(false);
	pEdit->setProperty(Edit_Text_Change, editTextChange);

	setCodeTypeProperty(pEdit, txtFile->loadWithCode);
	setCodeBarLabel((CODE_ID)txtFile->loadWithCode);

	setLineEndBarLabel(lineEnd);
	setEndTypeProperty(pEdit, lineEnd);
	setDocEolMode(pEdit, lineEnd);