C++/Qt/QTextFrame

Материал из C\C++ эксперт
Перейти к: навигация, поиск

QTextFrame based calendar

  
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QDate>
#include <QMainWindow>
QT_BEGIN_NAMESPACE
class QTextBrowser;
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void setFontSize(int size);
    void setMonth(int month);
    void setYear(QDate date);
private:
    void insertCalendar();
    int fontSize;
    QDate selectedDate;
    QTextBrowser *editor;
};

#endif



#include <QtGui>
#include "mainwindow.h"

MainWindow::MainWindow()
{
    selectedDate = QDate::currentDate();
    fontSize = 10;
    QWidget *centralWidget = new QWidget;

    QLabel *dateLabel = new QLabel(tr("Date:"));
    QComboBox *monthCombo = new QComboBox;
    for (int month = 1; month <= 12; ++month)
        monthCombo->addItem(QDate::longMonthName(month));
    QDateTimeEdit *yearEdit = new QDateTimeEdit;
    yearEdit->setDisplayFormat("yyyy");
    yearEdit->setDateRange(QDate(1753, 1, 1), QDate(8000, 1, 1));

    monthCombo->setCurrentIndex(selectedDate.month() - 1);
    yearEdit->setDate(selectedDate);

    QLabel *fontSizeLabel = new QLabel(tr("Font size:"));
    QSpinBox *fontSizeSpinBox = new QSpinBox;
    fontSizeSpinBox->setRange(1, 64);
    fontSizeSpinBox->setValue(10);
    editor = new QTextBrowser;
    insertCalendar();

    connect(monthCombo, SIGNAL(activated(int)), this, SLOT(setMonth(int)));
    connect(yearEdit, SIGNAL(dateChanged(QDate)), this, SLOT(setYear(QDate)));
    connect(fontSizeSpinBox, SIGNAL(valueChanged(int)),
            this, SLOT(setFontSize(int)));

    QHBoxLayout *controlsLayout = new QHBoxLayout;
    controlsLayout->addWidget(dateLabel);
    controlsLayout->addWidget(monthCombo);
    controlsLayout->addWidget(yearEdit);
    controlsLayout->addSpacing(24);
    controlsLayout->addWidget(fontSizeLabel);
    controlsLayout->addWidget(fontSizeSpinBox);
    controlsLayout->addStretch(1);
    QVBoxLayout *centralLayout = new QVBoxLayout;
    centralLayout->addLayout(controlsLayout);
    centralLayout->addWidget(editor, 1);
    centralWidget->setLayout(centralLayout);
    setCentralWidget(centralWidget);
}

void MainWindow::insertCalendar()
{
    editor->clear();
    QTextCursor cursor = editor->textCursor();
    cursor.beginEditBlock();
    QDate date(selectedDate.year(), selectedDate.month(), 1);

    QTextTableFormat tableFormat;
    tableFormat.setAlignment(Qt::AlignHCenter);
    tableFormat.setBackground(QColor("#e0e0e0"));
    tableFormat.setCellPadding(2);
    tableFormat.setCellSpacing(4);
 
    QVector<QTextLength> constraints;
    constraints << QTextLength(QTextLength::PercentageLength, 14)
                << QTextLength(QTextLength::PercentageLength, 14)
                << QTextLength(QTextLength::PercentageLength, 14)
                << QTextLength(QTextLength::PercentageLength, 14)
                << QTextLength(QTextLength::PercentageLength, 14)
                << QTextLength(QTextLength::PercentageLength, 14)
                << QTextLength(QTextLength::PercentageLength, 14);
    tableFormat.setColumnWidthConstraints(constraints);

    QTextTable *table = cursor.insertTable(1, 7, tableFormat);

    QTextFrame *frame = cursor.currentFrame();
    QTextFrameFormat frameFormat = frame->frameFormat();
    frameFormat.setBorder(1);
    frame->setFrameFormat(frameFormat);

    QTextCharFormat format = cursor.charFormat();
    format.setFontPointSize(fontSize);
    QTextCharFormat boldFormat = format;
    boldFormat.setFontWeight(QFont::Bold);
    QTextCharFormat highlightedFormat = boldFormat;
    highlightedFormat.setBackground(Qt::yellow);

    for (int weekDay = 1; weekDay <= 7; ++weekDay) {
        QTextTableCell cell = table->cellAt(0, weekDay-1);
 
        QTextCursor cellCursor = cell.firstCursorPosition();
        cellCursor.insertText(QString("%1").arg(QDate::longDayName(weekDay)),
                              boldFormat);
    }

    table->insertRows(table->rows(), 1);

    while (date.month() == selectedDate.month()) {
        int weekDay = date.dayOfWeek();
        QTextTableCell cell = table->cellAt(table->rows()-1, weekDay-1);
        QTextCursor cellCursor = cell.firstCursorPosition();
        if (date == QDate::currentDate())
            cellCursor.insertText(QString("%1").arg(date.day()), highlightedFormat);
        else
            cellCursor.insertText(QString("%1").arg(date.day()), format);
        date = date.addDays(1);
        if (weekDay == 7 && date.month() == selectedDate.month())
            table->insertRows(table->rows(), 1);
    }
    cursor.endEditBlock();
    setWindowTitle(tr("Calendar for %1 %2"
        ).arg(QDate::longMonthName(selectedDate.month())
        ).arg(selectedDate.year()));
}

void MainWindow::setFontSize(int size)
{
    fontSize = size;
    insertCalendar();
}

void MainWindow::setMonth(int month)
{
    selectedDate = QDate(selectedDate.year(), month + 1, selectedDate.day());
    insertCalendar();
}

void MainWindow::setYear(QDate date)
{
    selectedDate = QDate(date.year(), selectedDate.month(), selectedDate.day());
    insertCalendar();
}



#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow window;
    window.resize(640, 256);
    window.show();
    return app.exec();
}


Using QTextFrame

  
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef XMLWRITER_H
#define XMLWRITER_H
#include <QDomDocument>
class QTextDocument;
class XmlWriter
{
public:
    XmlWriter(QTextDocument *document) : textDocument(document) {}
    QDomDocument *toXml();
private:
    void processBlock(QDomElement &parent, const QTextBlock &block);
    void processFrame(QDomElement &parent, QTextFrame *frame);
    QDomDocument *document;
    QTextDocument *textDocument;
};
#endif


#include <QtGui>
#include "xmlwriter.h"
QDomDocument *XmlWriter::toXml()
{
    QDomImplementation implementation;
    QDomDocumentType docType = implementation.createDocumentType(
        "scribe-document", "scribe", "qt,nokia.com/scribe");
    document = new QDomDocument(docType);
    // ### This processing instruction is required to ensure that any kind
    // of encoding is given when the document is written.
    QDomProcessingInstruction process = document->createProcessingInstruction(
        "xml", "version=\"1.0\" encoding=\"utf-8\"");
    document->appendChild(process);
    QDomElement documentElement = document->createElement("document");
    document->appendChild(documentElement);

    QTextFrame *root = textDocument->rootFrame();
    
    if (root)
        processFrame(documentElement, root);
    return document;
}
void XmlWriter::processBlock(QDomElement &parent, const QTextBlock &block)
{
    QDomElement blockElement = document->createElement("block");
    blockElement.setAttribute("position", block.position());
    blockElement.setAttribute("length", block.length());
    parent.appendChild(blockElement);
    QTextBlock::iterator it;
    for (it = block.begin(); !(it.atEnd()); ++it) {
        QTextFragment fragment = it.fragment();
        if (fragment.isValid()) {
            QDomElement fragmentElement = document->createElement("fragment");
            blockElement.appendChild(fragmentElement);
            fragmentElement.setAttribute("length", fragment.length());
            QDomText fragmentText = document->createTextNode(fragment.text());
            fragmentElement.appendChild(fragmentText);
        }
    }
}
void XmlWriter::processFrame(QDomElement &parent, QTextFrame *frame)
{
    QDomElement frameElement = document->createElement("frame");
    frameElement.setAttribute("begin", frame->firstPosition());
    frameElement.setAttribute("end", frame->lastPosition());
    parent.appendChild(frameElement);

    QTextFrame::iterator it;
    for (it = frame->begin(); !(it.atEnd()); ++it) {
        QTextFrame *childFrame = it.currentFrame();
        QTextBlock childBlock = it.currentBlock();
        if (childFrame)
 
            processFrame(frameElement, childFrame);
        else if (childBlock.isValid())
            processBlock(frameElement, childBlock);
    }
}



/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QTextEdit;
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void saveFile();
private:
    bool writeXml(const QString &fileName);
    QTextEdit *editor;
};
#endif


#include <QtGui>
#include "mainwindow.h"
#include "xmlwriter.h"
MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));
    QAction *saveAction = fileMenu->addAction(tr("&Save..."));
    saveAction->setShortcut(tr("Ctrl+S"));
    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcut(tr("Ctrl+Q"));
    menuBar()->addMenu(fileMenu);
    editor = new QTextEdit();
    QTextCursor cursor(editor->textCursor());
    cursor.movePosition(QTextCursor::Start); 
    QTextFrame *mainFrame = cursor.currentFrame();
    
    QTextCharFormat plainCharFormat;
    QTextCharFormat boldCharFormat;
    boldCharFormat.setFontWeight(QFont::Bold);
/*  main frame
    QTextFrame *mainFrame = cursor.currentFrame();
    cursor.insertText(...);
*/
    cursor.insertText("Text documents are represented by the "
                      "QTextDocument class, rather than by QString objects. "
                      "Each QTextDocument object contains information about "
                      "the document"s internal representation, its structure, "
                      "and keeps track of modifications to provide undo/redo "
                      "facilities. This approach allows features such as the "
                      "layout management to be delegated to specialized "
                      "classes, but also provides a focus for the framework.",
                      plainCharFormat);

    QTextFrameFormat frameFormat;
    frameFormat.setMargin(32);
    frameFormat.setPadding(8);
    frameFormat.setBorder(4);
    cursor.insertFrame(frameFormat);
/*  insert frame
    cursor.insertFrame(frameFormat);
    cursor.insertText(...);
*/
    cursor.insertText("Documents are either converted from external sources "
                      "or created from scratch using Qt. The creation process "
                      "can done by an editor widget, such as QTextEdit, or by "
                      "explicit calls to the Scribe API.", boldCharFormat);
    cursor = mainFrame->lastCursorPosition();
/*  last cursor
    cursor = mainFrame->lastCursorPosition();
    cursor.insertText(...);
*/
    cursor.insertText("There are two complementary ways to visualize the "
                      "contents of a document: as a linear buffer that is "
                      "used by editors to modify the contents, and as an "
                      "object hierarchy containing structural information "
                      "that is useful to layout engines. In the hierarchical "
                      "model, the objects generally correspond to visual "
                      "elements such as frames, tables, and lists. At a lower "
                      "level, these elements describe properties such as the "
                      "style of text used and its alignment. The linear "
                      "representation of the document is used for editing and "
                      "manipulation of the document"s contents.",
                      plainCharFormat);

    connect(saveAction, SIGNAL(triggered()), this, SLOT(saveFile()));
    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    setCentralWidget(editor);
    setWindowTitle(tr("Text Document Frames"));
}
void MainWindow::saveFile()
{
    QString fileName = QFileDialog::getSaveFileName(this,
        tr("Save document as:"), "", tr("XML (*.xml)"));
    if (!fileName.isEmpty()) {
        if (writeXml(fileName))
            setWindowTitle(fileName);
        else
            QMessageBox::warning(this, tr("Warning"),
                tr("Failed to save the document."), QMessageBox::Cancel,
                QMessageBox::NoButton);
    }
}
bool MainWindow::writeXml(const QString &fileName)
{
    XmlWriter documentWriter(editor->document());
    QDomDocument *domDocument = documentWriter.toXml();
    QFile file(fileName);
    if (file.open(QFile::WriteOnly)) {
        QTextStream textStream(&file);
        textStream.setCodec(QTextCodec::codecForName("UTF-8"));
        
        textStream << domDocument->toString(1).toUtf8();
        file.close();
        return true;
    }
    else
        return false;
}


#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->resize(480, 480);
    window->show();
    return app.exec();
}