C++/Qt/QTextFrame — различия между версиями

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Версия 17:21, 25 мая 2010

QTextFrame based calendar

<source lang="cpp"> /****************************************************************************

    • 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.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. ifndef MAINWINDOW_H
  2. define MAINWINDOW_H
  3. include <QDate>
  4. 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;

};

  1. endif


  1. include <QtGui>
  2. 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();

}


  1. include <QtGui>
  2. include "mainwindow.h"

int main(int argc, char *argv[]) { 

   QApplication app(argc, argv);
   MainWindow window;
   window.resize(640, 256);
   window.show();
   return app.exec();

} 


 </source>


Using QTextFrame

<source lang="cpp"> /****************************************************************************

    • 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.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. ifndef XMLWRITER_H
  2. define XMLWRITER_H
  3. 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;

};

  1. endif


  1. include <QtGui>
  2. 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.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. ifndef WINDOW_H
  2. define WINDOW_H
  3. include <QMainWindow>

class QTextEdit; class MainWindow : public QMainWindow { 

   Q_OBJECT

public: 

   MainWindow();

public slots: 

   void saveFile();

private: 

   bool writeXml(const QString &fileName);
   QTextEdit *editor;

};

  1. endif


  1. include <QtGui>
  2. include "mainwindow.h"
  3. 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;

}


  1. include <QtGui>
  2. 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();

} 


 </source>
Источник — «http://cppe.ru/index.php?title=C%2B%2B/Qt/QTextFrame&oldid=1226»