textedit.cpp Example File
demos/textedit/textedit.cpp
/****************************************************************************
**
** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
**
** This file is part of the documentation of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/
#include "textedit.h"
#include <QAction>
#include <QApplication>
#include <QClipboard>
#include <QColorDialog>
#include <QComboBox>
#include <QFile>
#include <QFileDialog>
#include <QFileInfo>
#include <QFontDatabase>
#include <QMenu>
#include <QMenuBar>
#include <QPrintDialog>
#include <QPrinter>
#include <QTextCodec>
#include <QTextEdit>
#include <QToolBar>
#include <QTextCursor>
#include <QTextList>
#include <QtDebug>
#include <QCloseEvent>
#include <QMessageBox>
#ifdef Q_WS_MAC
const QString rsrcPath = ":/images/mac";
#else
const QString rsrcPath = ":/images/win";
#endif
TextEdit::TextEdit(QWidget *parent)
: QMainWindow(parent)
{
setupFileActions();
setupEditActions();
setupTextActions();
textEdit = new QTextEdit(this);
connect(textEdit, SIGNAL(currentCharFormatChanged(const QTextCharFormat &)),
this, SLOT(currentCharFormatChanged(const QTextCharFormat &)));
setCentralWidget(textEdit);
textEdit->setFocus();
setCurrentFileName(QString());
fontChanged(textEdit->font());
colorChanged(textEdit->textColor());
alignmentChanged(textEdit->alignment());
connect(textEdit->document(), SIGNAL(modificationChanged(bool)),
actionSave, SLOT(setEnabled(bool)));
connect(textEdit->document(), SIGNAL(modificationChanged(bool)),
this, SLOT(setWindowModified(bool)));
connect(textEdit->document(), SIGNAL(undoAvailable(bool)),
actionUndo, SLOT(setEnabled(bool)));
connect(textEdit->document(), SIGNAL(redoAvailable(bool)),
actionRedo, SLOT(setEnabled(bool)));
setWindowModified(textEdit->document()->isModified());
actionSave->setEnabled(textEdit->document()->isModified());
actionUndo->setEnabled(textEdit->document()->isUndoAvailable());
actionRedo->setEnabled(textEdit->document()->isRedoAvailable());
connect(actionUndo, SIGNAL(triggered()), textEdit->document(), SLOT(undo()));
connect(actionRedo, SIGNAL(triggered()), textEdit->document(), SLOT(redo()));
actionCut->setEnabled(false);
actionCopy->setEnabled(false);
connect(actionCut, SIGNAL(triggered()), textEdit, SLOT(cut()));
connect(actionCopy, SIGNAL(triggered()), textEdit, SLOT(copy()));
connect(actionPaste, SIGNAL(triggered()), textEdit, SLOT(paste()));
connect(textEdit, SIGNAL(copyAvailable(bool)), actionCut, SLOT(setEnabled(bool)));
connect(textEdit, SIGNAL(copyAvailable(bool)), actionCopy, SLOT(setEnabled(bool)));
connect(QApplication::clipboard(), SIGNAL(dataChanged()), this, SLOT(clipboardDataChanged()));
QString initialFile = ":/example.html";
const QStringList args = QCoreApplication::arguments();
if (args.count() == 2)
initialFile = args.at(1);
if (!load(initialFile))
fileNew();
}
void TextEdit::closeEvent(QCloseEvent *e)
{
if (maybeSave())
e->accept();
else
e->ignore();
}
void TextEdit::setupFileActions()
{
QToolBar *tb = new QToolBar(this);
tb->setWindowTitle(tr("File Actions"));
addToolBar(tb);
QMenu *menu = new QMenu(tr("&File"), this);
menuBar()->addMenu(menu);
QAction *a;
a = new QAction(QIcon(rsrcPath + "/filenew.png"), tr("&New"), this);
a->setShortcut(Qt::CTRL + Qt::Key_N);
connect(a, SIGNAL(triggered()), this, SLOT(fileNew()));
tb->addAction(a);
menu->addAction(a);
a = new QAction(QIcon(rsrcPath + "/fileopen.png"), tr("&Open..."), this);
a->setShortcut(Qt::CTRL + Qt::Key_O);
connect(a, SIGNAL(triggered()), this, SLOT(fileOpen()));
tb->addAction(a);
menu->addAction(a);
menu->addSeparator();
actionSave = a = new QAction(QIcon(rsrcPath + "/filesave.png"), tr("&Save"), this);
a->setShortcut(Qt::CTRL + Qt::Key_S);
connect(a, SIGNAL(triggered()), this, SLOT(fileSave()));
a->setEnabled(false);
tb->addAction(a);
menu->addAction(a);
a = new QAction(tr("Save &As..."), this);
connect(a, SIGNAL(triggered()), this, SLOT(fileSaveAs()));
menu->addAction(a);
menu->addSeparator();
a = new QAction(QIcon(rsrcPath + "/fileprint.png"), tr("&Print..."), this);
a->setShortcut(Qt::CTRL + Qt::Key_P);
connect(a, SIGNAL(triggered()), this, SLOT(filePrint()));
tb->addAction(a);
menu->addAction(a);
a = new QAction(QIcon(rsrcPath + "/exportpdf.png"), tr("&Export PDF..."), this);
a->setShortcut(Qt::CTRL + Qt::Key_D);
connect(a, SIGNAL(triggered()), this, SLOT(filePrintPdf()));
tb->addAction(a);
menu->addAction(a);
menu->addSeparator();
a = new QAction(tr("&Quit"), this);
a->setShortcut(Qt::CTRL + Qt::Key_Q);
connect(a, SIGNAL(triggered()), this, SLOT(close()));
menu->addAction(a);
}
void TextEdit::setupEditActions()
{
QToolBar *tb = new QToolBar(this);
tb->setWindowTitle(tr("Edit Actions"));
addToolBar(tb);
QMenu *menu = new QMenu(tr("&Edit"), this);
menuBar()->addMenu(menu);
QAction *a;
a = actionUndo = new QAction(QIcon(rsrcPath + "/editundo.png"), tr("&Undo"), this);
a->setShortcut(Qt::CTRL + Qt::Key_Z);
tb->addAction(a);
menu->addAction(a);
a = actionRedo = new QAction(QIcon(rsrcPath + "/editredo.png"), tr("&Redo"), this);
a->setShortcut(Qt::CTRL + Qt::Key_Y);
tb->addAction(a);
menu->addAction(a);
menu->addSeparator();
a = actionCut = new QAction(QIcon(rsrcPath + "/editcut.png"), tr("Cu&t"), this);
a->setShortcut(Qt::CTRL + Qt::Key_X);
tb->addAction(a);
menu->addAction(a);
a = actionCopy = new QAction(QIcon(rsrcPath + "/editcopy.png"), tr("&Copy"), this);
a->setShortcut(Qt::CTRL + Qt::Key_C);
tb->addAction(a);
menu->addAction(a);
a = actionPaste = new QAction(QIcon(rsrcPath + "/editpaste.png"), tr("&Paste"), this);
a->setShortcut(Qt::CTRL + Qt::Key_V);
tb->addAction(a);
menu->addAction(a);
actionPaste->setEnabled(!QApplication::clipboard()->text().isEmpty());
}
void TextEdit::setupTextActions()
{
QToolBar *tb = new QToolBar(this);
tb->setWindowTitle(tr("Format Actions"));
addToolBar(tb);
QMenu *menu = new QMenu(tr("F&ormat"), this);
menuBar()->addMenu(menu);
actionTextBold = new QAction(QIcon(rsrcPath + "/textbold.png"), tr("&Bold"), this);
actionTextBold->setShortcut(Qt::CTRL + Qt::Key_B);
QFont bold;
bold.setBold(true);
actionTextBold->setFont(bold);
connect(actionTextBold, SIGNAL(triggered()), this, SLOT(textBold()));
tb->addAction(actionTextBold);
menu->addAction(actionTextBold);
actionTextBold->setCheckable(true);
actionTextItalic = new QAction(QIcon(rsrcPath + "/textitalic.png"), tr("&Italic"), this);
actionTextItalic->setShortcut(Qt::CTRL + Qt::Key_I);
QFont italic;
italic.setItalic(true);
actionTextItalic->setFont(italic);
connect(actionTextItalic, SIGNAL(triggered()), this, SLOT(textItalic()));
tb->addAction(actionTextItalic);
menu->addAction(actionTextItalic);
actionTextItalic->setCheckable(true);
actionTextUnderline = new QAction(QIcon(rsrcPath + "/textunder.png"), tr("&Underline"), this);
actionTextUnderline->setShortcut(Qt::CTRL + Qt::Key_U);
QFont underline;
underline.setUnderline(true);
actionTextUnderline->setFont(underline);
connect(actionTextUnderline, SIGNAL(triggered()), this, SLOT(textUnderline()));
tb->addAction(actionTextUnderline);
menu->addAction(actionTextUnderline);
actionTextUnderline->setCheckable(true);
menu->addSeparator();
QActionGroup *grp = new QActionGroup(this);
connect(grp, SIGNAL(triggered(QAction *)), this, SLOT(textAlign(QAction *)));
actionAlignLeft = new QAction(QIcon(rsrcPath + "/textleft.png"), tr("&Left"), grp);
actionAlignLeft->setShortcut(Qt::CTRL + Qt::Key_L);
actionAlignLeft->setCheckable(true);
actionAlignCenter = new QAction(QIcon(rsrcPath + "/textcenter.png"), tr("C&enter"), grp);
actionAlignCenter->setShortcut(Qt::CTRL + Qt::Key_E);
actionAlignCenter->setCheckable(true);
actionAlignRight = new QAction(QIcon(rsrcPath + "/textright.png"), tr("&Right"), grp);
actionAlignRight->setShortcut(Qt::CTRL + Qt::Key_R);
actionAlignRight->setCheckable(true);
actionAlignJustify = new QAction(QIcon(rsrcPath + "/textjustify.png"), tr("&Justify"), grp);
actionAlignJustify->setShortcut(Qt::CTRL + Qt::Key_J);
actionAlignJustify->setCheckable(true);
tb->addActions(grp->actions());
menu->addActions(grp->actions());
menu->addSeparator();
QPixmap pix(16, 16);
pix.fill(Qt::black);
actionTextColor = new QAction(pix, tr("&Color..."), this);
connect(actionTextColor, SIGNAL(triggered()), this, SLOT(textColor()));
tb->addAction(actionTextColor);
menu->addAction(actionTextColor);
tb = new QToolBar(this);
tb->setAllowedAreas(Qt::TopToolBarArea | Qt::BottomToolBarArea);
tb->setWindowTitle(tr("Format Actions"));
addToolBarBreak(Qt::TopToolBarArea);
addToolBar(tb);
comboStyle = new QComboBox(tb);
tb->addWidget(comboStyle);
comboStyle->addItem("Standard");
comboStyle->addItem("Bullet List (Disc)");
comboStyle->addItem("Bullet List (Circle)");
comboStyle->addItem("Bullet List (Square)");
comboStyle->addItem("Ordered List (Decimal)");
comboStyle->addItem("Ordered List (Alpha lower)");
comboStyle->addItem("Ordered List (Alpha upper)");
connect(comboStyle, SIGNAL(activated(int)),
this, SLOT(textStyle(int)));
comboFont = new QComboBox(tb);
tb->addWidget(comboFont);
comboFont->setEditable(true);
QFontDatabase db;
comboFont->addItems(db.families());
connect(comboFont, SIGNAL(activated(const QString &)),
this, SLOT(textFamily(const QString &)));
comboFont->setCurrentIndex(comboFont->findText(QApplication::font().family()));
comboSize = new QComboBox(tb);
comboSize->setObjectName("comboSize");
tb->addWidget(comboSize);
comboSize->setEditable(true);
foreach(int size, db.standardSizes())
comboSize->addItem(QString::number(size));
connect(comboSize, SIGNAL(activated(const QString &)),
this, SLOT(textSize(const QString &)));
comboSize->setCurrentIndex(comboSize->findText(QString::number(QApplication::font()
.pointSize())));
}
bool TextEdit::load(const QString &f)
{
if (!QFile::exists(f))
return false;
QFile file(f);
if (!file.open(QFile::ReadOnly))
return false;
QByteArray data = file.readAll();
QTextCodec *codec = Qt::codecForHtml(data);
QString str = codec->toUnicode(data);
if (Qt::mightBeRichText(str)) {
textEdit->setHtml(str);
} else {
str = QString::fromLocal8Bit(data);
textEdit->setPlainText(str);
}
setCurrentFileName(f);
return true;
}
bool TextEdit::maybeSave()
{
if (!textEdit->document()->isModified())
return true;
if (fileName.startsWith(QLatin1String(":/")))
return true;
int ret = QMessageBox::warning(this, tr("Application"),
tr("The document has been modified.\n"
"Do you want to save your changes?"),
QMessageBox::Yes | QMessageBox::Default,
QMessageBox::No,
QMessageBox::Cancel | QMessageBox::Escape);
if (ret == QMessageBox::Yes)
return fileSave();
else if (ret == QMessageBox::Cancel)
return false;
return true;
}
void TextEdit::setCurrentFileName(const QString &fileName)
{
this->fileName = fileName;
textEdit->document()->setModified(false);
QString shownName;
if (fileName.isEmpty())
shownName = "untitled.txt";
else
shownName = QFileInfo(fileName).fileName();
setWindowTitle(tr("%1[*] - %2").arg(shownName).arg(tr("Rich Text")));
setWindowModified(false);
}
void TextEdit::fileNew()
{
if (maybeSave()) {
textEdit->clear();
setCurrentFileName(QString());
}
}
void TextEdit::fileOpen()
{
QString fn = QFileDialog::getOpenFileName(this, tr("Open File..."),
QString(), tr("HTML-Files (*.htm *.html);;All Files (*)"));
if (!fn.isEmpty())
load(fn);
}
bool TextEdit::fileSave()
{
if (fileName.isEmpty())
return fileSaveAs();
QFile file(fileName);
if (!file.open(QFile::WriteOnly))
return false;
QTextStream ts(&file);
ts.setCodec(QTextCodec::codecForName("UTF-8"));
ts << textEdit->document()->toHtml("UTF-8");
textEdit->document()->setModified(false);
return true;
}
bool TextEdit::fileSaveAs()
{
QString fn = QFileDialog::getSaveFileName(this, tr("Save as..."),
QString(), tr("HTML-Files (*.htm *.html);;All Files (*)"));
if (fn.isEmpty())
return false;
setCurrentFileName(fn);
return fileSave();
}
void TextEdit::filePrint()
{
#ifndef QT_NO_PRINTER
QPrinter printer(QPrinter::HighResolution);
printer.setFullPage(true);
QPrintDialog *dlg = new QPrintDialog(&printer, this);
if (dlg->exec() == QDialog::Accepted) {
textEdit->document()->print(&printer);
}
delete dlg;
#endif
}
void TextEdit::filePrintPdf()
{
#ifndef QT_NO_PRINTER
QString fileName = QFileDialog::getSaveFileName(this, "Export PDF", QString(), "*.pdf");
if (fileName.isEmpty())
return;
QPrinter printer(QPrinter::HighResolution);
printer.setOutputFormat(QPrinter::PdfFormat);
printer.setOutputFileName(fileName);
textEdit->document()->print(&printer);
#endif
}
void TextEdit::textBold()
{
textEdit->setFontWeight(actionTextBold->isChecked() ? QFont::Bold : QFont::Normal);
}
void TextEdit::textUnderline()
{
textEdit->setFontUnderline(actionTextUnderline->isChecked());
}
void TextEdit::textItalic()
{
textEdit->setFontItalic(actionTextItalic->isChecked());
}
void TextEdit::textFamily(const QString &f)
{
textEdit->setFontFamily(f);
}
void TextEdit::textSize(const QString &p)
{
textEdit->setFontPointSize(p.toFloat());
}
void TextEdit::textStyle(int styleIndex)
{
QTextCursor cursor = textEdit->textCursor();
if (styleIndex != 0) {
QTextListFormat::Style style = QTextListFormat::ListDisc;
switch (styleIndex) {
default:
case 1:
style = QTextListFormat::ListDisc;
break;
case 2:
style = QTextListFormat::ListCircle;
break;
case 3:
style = QTextListFormat::ListSquare;
break;
case 4:
style = QTextListFormat::ListDecimal;
break;
case 5:
style = QTextListFormat::ListLowerAlpha;
break;
case 6:
style = QTextListFormat::ListUpperAlpha;
break;
}
cursor.beginEditBlock();
QTextBlockFormat blockFmt = cursor.blockFormat();
QTextListFormat listFmt;
if (cursor.currentList()) {
listFmt = cursor.currentList()->format();
} else {
listFmt.setIndent(blockFmt.indent() + 1);
blockFmt.setIndent(0);
cursor.setBlockFormat(blockFmt);
}
listFmt.setStyle(style);
cursor.createList(listFmt);
cursor.endEditBlock();
} else {
// ####
QTextBlockFormat bfmt;
bfmt.setObjectIndex(-1);
cursor.mergeBlockFormat(bfmt);
}
}
void TextEdit::textColor()
{
QColor col = QColorDialog::getColor(textEdit->textColor(), this);
if (!col.isValid())
return;
textEdit->setTextColor(col);
colorChanged(col);
}
void TextEdit::textAlign(QAction *a)
{
if (a == actionAlignLeft)
textEdit->setAlignment(Qt::AlignLeft);
else if (a == actionAlignCenter)
textEdit->setAlignment(Qt::AlignHCenter);
else if (a == actionAlignRight)
textEdit->setAlignment(Qt::AlignRight);
else if (a == actionAlignJustify)
textEdit->setAlignment(Qt::AlignJustify);
}
void TextEdit::currentCharFormatChanged(const QTextCharFormat &format)
{
fontChanged(format.font());
colorChanged(format.foreground().color());
alignmentChanged(textEdit->alignment());
}
void TextEdit::clipboardDataChanged()
{
actionPaste->setEnabled(!QApplication::clipboard()->text().isEmpty());
}
void TextEdit::fontChanged(const QFont &f)
{
comboFont->setCurrentIndex(comboFont->findText(f.family()));
comboSize->setCurrentIndex(comboSize->findText(QString::number(f.pointSize())));
actionTextBold->setChecked(f.bold());
actionTextItalic->setChecked(f.italic());
actionTextUnderline->setChecked(f.underline());
}
void TextEdit::colorChanged(const QColor &c)
{
QPixmap pix(16, 16);
pix.fill(c);
actionTextColor->setIcon(pix);
}
void TextEdit::alignmentChanged(Qt::Alignment a)
{
if (a & Qt::AlignLeft)
actionAlignLeft->setChecked(true);
else if (a & Qt::AlignHCenter)
actionAlignCenter->setChecked(true);
else if (a & Qt::AlignRight)
actionAlignRight->setChecked(true);
else if (a & Qt::AlignJustify)
actionAlignJustify->setChecked(true);
}
