C++ QTextDocument::firstBlock方法代码示例

void CppCodeStylePreferencesWidget::updatePreview()
{
    CppCodeStylePreferences *cppCodeStylePreferences = m_preferences
            ? m_preferences
            : CppToolsSettings::instance()->cppCodeStyle();
    const CppCodeStyleSettings ccss = cppCodeStylePreferences->currentCodeStyleSettings();
    const TextEditor::TabSettings ts = cppCodeStylePreferences->currentTabSettings();
    QtStyleCodeFormatter formatter(ts, ccss);
    foreach (TextEditor::SnippetEditorWidget *preview, m_previews) {
        preview->setTabSettings(ts);
        preview->setCodeStyle(cppCodeStylePreferences);

        QTextDocument *doc = preview->document();
        formatter.invalidateCache(doc);

        QTextBlock block = doc->firstBlock();
        QTextCursor tc = preview->textCursor();
        tc.beginEditBlock();
        while (block.isValid()) {
            preview->indenter()->indentBlock(doc, block, QChar::Null, ts);

            block = block.next();
        }
        applyRefactorings(doc, preview, ccss);
        tc.endEditBlock();
    }

void AnnotationSettings::updateFontIfUniform()
{
	bool uniformFontFamily = true;
	bool uniformSize = true;
	bool uniformColor = true;

	QTextDocument *doc = _ui->content->document();

	QTextBlock b = doc->firstBlock();
	QTextCharFormat fmt1;
	bool first=true;

	// Check all character formats in all blocks. If they are the same,
	// we can reset the font for the wole document.
	while(b.isValid()) {
		for(const QTextLayout::FormatRange &fr : b.textFormats()) {

			if(first) {
				fmt1 = fr.format;
				first = false;

			} else {
				uniformFontFamily &= fr.format.fontFamily() == fmt1.fontFamily();
				uniformSize &= fr.format.fontPointSize() == fmt1.fontPointSize();
				uniformColor &= fr.format.foreground() == fmt1.foreground();
			}
		}
		b = b.next();
	}

	resetContentFont(uniformFontFamily, uniformSize, uniformColor);
}

QTextBlock QTextDocumentProto::firstBlock() const
{
  QTextDocument *item = qscriptvalue_cast<QTextDocument*>(thisObject());
  if (item)
    return item->firstBlock();
  return QTextBlock();
}

// 遍历文本块
void MainWindow::showTextBlock()
{
    QTextDocument *document = ui->textEdit->document();
    // 获取文档的第一个文本块
    QTextBlock block = document->firstBlock();
    for(int i=0; i<document->blockCount(); i++){
        qDebug() << tr("文本块%1，文本块首行行号为:%2，长度为:%3,内容为：")
                    .arg(i).arg(block.firstLineNumber()).arg(block.length())
                 << block.text();
        // 获取下一个文本块
        block = block.next();
    }
}

/*!
  Replaces the entire contents of the document
  with the given HTML-formatted text in the \a text string
*/
void RichString::setHtml(const QString &text)
{
    QTextDocument doc;
    doc.setHtml(text);
    QTextBlock block = doc.firstBlock();
    QTextBlock::iterator it;
    for (it = block.begin(); !(it.atEnd()); ++it) {
        QTextFragment textFragment = it.fragment();
        if (textFragment.isValid()) {
            Format fmt;
            fmt.setFont(textFragment.charFormat().font());
            fmt.setFontColor(textFragment.charFormat().foreground().color());
            addFragment(textFragment.text(), fmt);
        }
    }
}

void CodeStyleEditor::updatePreview()
{
    QTextDocument *doc = m_preview->document();

    m_preview->indenter()->invalidateCache(doc);

    QTextBlock block = doc->firstBlock();
    QTextCursor tc = m_preview->textCursor();
    tc.beginEditBlock();
    while (block.isValid()) {
        m_preview->indenter()->indentBlock(doc, block, QChar::Null, m_codeStyle->currentTabSettings());

        block = block.next();
    }
    tc.endEditBlock();
}

void NimCodeStylePreferencesWidget::updatePreview()
{
    QTextDocument *doc = m_ui->previewTextEdit->document();

    const TabSettings &ts = m_preferences
            ? m_preferences->currentTabSettings()
            : TextEditorSettings::codeStyle()->tabSettings();
    m_ui->previewTextEdit->textDocument()->setTabSettings(ts);

    QTextBlock block = doc->firstBlock();
    QTextCursor tc = m_ui->previewTextEdit->textCursor();
    tc.beginEditBlock();
    while (block.isValid()) {
        m_ui->previewTextEdit->textDocument()->indenter()
                ->indentBlock(doc, block, QChar::Null, ts);
        block = block.next();
    }
    tc.endEditBlock();
}

	void FormatDocument(QTextDocument &doc, const int lineHeight)
	{
		assert(lineHeight > 0);

        if (platform::is_apple())
        {
            doc.setDocumentMargin(0);

            return;
        }

		for (auto block = doc.firstBlock(); block.isValid(); block = block.next())
		{
			QTextCursor c(block);
			auto f = c.blockFormat();
			f.setLineHeight(lineHeight, QTextBlockFormat::FixedHeight);
			c.setBlockFormat(f);
		}

		doc.setDocumentMargin(0);
	}

/*! \reimp
 */
void TextDocumentLayout::documentChanged(int from, int /*charsRemoved*/, int charsAdded)
{
    QTextDocument *doc = document();
    int newBlockCount = doc->blockCount();

    QTextBlock changeStartBlock = doc->findBlock(from);
    QTextBlock changeEndBlock = doc->findBlock(qMax(0, from + charsAdded - 1));

    if (changeStartBlock == changeEndBlock && newBlockCount == d->blockCount) {
        QTextBlock block = changeStartBlock;
        if (block.isValid()  && block.layout()->lineCount()) {
            QRectF oldBr = blockBoundingRect(block);
            layoutBlock(block);
            QRectF newBr = blockBoundingRect(block);
            if (newBr.height() == oldBr.height()) {
                if (!d->blockUpdate)
                    emit updateBlock(block);
                return;
            }
        }
    } else {
        QTextBlock block = changeStartBlock;
        do {
            block.clearLayout();
            if (block == changeEndBlock)
                break;
            block = block.next();
        } while(block.isValid());
    }

    if (newBlockCount != d->blockCount) {

        int changeEnd = changeEndBlock.blockNumber();
        int blockDiff = newBlockCount - d->blockCount;
        int oldChangeEnd = changeEnd - blockDiff;

        if (d->maximumWidthBlockNumber > oldChangeEnd)
            d->maximumWidthBlockNumber += blockDiff;

        d->blockCount = newBlockCount;
        if (d->blockCount == 1)
            d->maximumWidth = blockWidth(doc->firstBlock());

        if (!d->blockDocumentSizeChanged)
            emit documentSizeChanged(documentSize());

        if (blockDiff == 1 && changeEnd == newBlockCount -1 ) {
            if (!d->blockUpdate)
            {
                QTextBlock b = changeStartBlock;
                for(;;) {
                    emit updateBlock(b);
                    if (b == changeEndBlock)
                        break;
                    b = b.next();
                }
            }
            return;
        }
    }
    if (!d->blockUpdate)
        emit update(QRectF(0., -doc->documentMargin(), 1000000000., 1000000000.)); // optimization potential
}

void TextDocumentLayout::layoutBlock(const QTextBlock &block)
{
    QTextDocument *doc = document();
    qreal margin = doc->documentMargin();
    qreal blockMaximumWidth = 0;

    qreal height = 0;
    QTextLayout *tl = block.layout();
    QTextOption option = doc->defaultTextOption();
    tl->setTextOption(option);

    int extraMargin = 0;
    if (option.flags() & QTextOption::AddSpaceForLineAndParagraphSeparators) {
        QFontMetrics fm(block.charFormat().font());
        extraMargin += fm.width(QChar(0x21B5));
    }
    tl->beginLayout();
    qreal availableWidth = d->width;
    if (availableWidth <= 0) {
        availableWidth = qreal(INT_MAX); // similar to text edit with pageSize.width == 0
    }
    availableWidth -= 2*margin + extraMargin;
    qreal indentMargin = 0;
    while (1) {
        QTextLine line = tl->createLine();
        if (!line.isValid())
            break;
        line.setLeadingIncluded(true);
        line.setLineWidth(availableWidth - indentMargin);
        line.setPosition(QPointF(margin + indentMargin, height));
        if(!height) //enter only in the first iteration
        {
            indentMargin = indentWidth(block);
        }
        height += line.height();
        blockMaximumWidth = qMax(blockMaximumWidth, line.naturalTextWidth() + 2*margin);
    }
    tl->endLayout();

    int previousLineCount = doc->lineCount();
    const_cast<QTextBlock&>(block).setLineCount(block.isVisible() ? tl->lineCount() : 0);
    int lineCount = doc->lineCount();

    bool emitDocumentSizeChanged = previousLineCount != lineCount;
    if (blockMaximumWidth > d->maximumWidth) {
        // new longest line
        d->maximumWidth = blockMaximumWidth;
        d->maximumWidthBlockNumber = block.blockNumber();
        emitDocumentSizeChanged = true;
    } else if (block.blockNumber() == d->maximumWidthBlockNumber && blockMaximumWidth < d->maximumWidth) {
        // longest line shrinking
        QTextBlock b = doc->firstBlock();
        d->maximumWidth = 0;
        QTextBlock maximumBlock;
        while (b.isValid()) {
            qreal blockMaximumWidth = blockWidth(b);
            if (blockMaximumWidth > d->maximumWidth) {
                d->maximumWidth = blockMaximumWidth;
                maximumBlock = b;
            }
            b = b.next();
        }
        if (maximumBlock.isValid()) {
            d->maximumWidthBlockNumber = maximumBlock.blockNumber();
            emitDocumentSizeChanged = true;
        }
    }
    if (emitDocumentSizeChanged)// && !d->blockDocumentSizeChanged)
        emit documentSizeChanged(documentSize());

    emit updateBlock(block);
}

void LiteWordCompleter::completionPrefixChanged(QString prefix,bool force)
{
    LiteCompleter::completionPrefixChanged(prefix,force);

    if (m_bExternalMode) {
        return;
    }

    if (!m_editor) {
        return;
    }
    if (!m_bSearchSeparator) {
        if (prefix.indexOf(".") >= 0) {
            return;
        }
    }

    bool isSep = false;
    if (prefix.startsWith("@.")) {
        isSep = true;
        prefix = prefix.mid(1);
    }

    QTextCursor tc = m_editor->textCursor();
    QTextDocument *doc = m_editor->document();
    int maxNumber = tc.blockNumber();
    int blockNumber = tc.blockNumber();
    QTextBlock block = doc->firstBlock();
    if (maxNumber < 500) {
        maxNumber = 500;
    } else {
        int firstNumber = maxNumber-500;
        if (firstNumber > 0) {
            block = doc->findBlockByNumber(firstNumber);
        }
    }
    QRegExp rx("([\\w\\-\\_\\.]+)");
    Qt::CaseSensitivity cs = m_completer->caseSensitivity();
    int count = 0;
    while (block.isValid()) {
        if (block.blockNumber() >= maxNumber) {
            break;
        }
        if (block.blockNumber() == blockNumber) {
            block = block.next();
            continue;
        }
        QString line = block.text().trimmed();
        if (!line.isEmpty())  {
             int pos = 0;
             while ((pos = rx.indexIn(line, pos)) != -1) {
                 QString cap = rx.cap(1);
                 if (cap.length() < 20 && cap.startsWith(prefix,cs)) {
                     if (isSep) {
                         cap = "@"+cap;
                     }
                     count++;
                     appendItem(cap,m_icon,true);
                 }
                 pos += rx.matchedLength();
             }
        }
        block = block.next();
    }
    if (count > 0) {
        this->updateCompleterModel();
        this->showPopup();
    }
}