/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Qt Software Information (qt-info@nokia.com) ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the either Technology Preview License Agreement or the ** Beta Release License Agreement. ** ** 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 1.0, 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 are unsure which license is appropriate for your use, please ** contact the sales department at qt-sales@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qerrormessage.h" #ifndef QT_NO_ERRORMESSAGE #include "qapplication.h" #include "qcheckbox.h" #include "qlabel.h" #include "qlayout.h" #include "qmessagebox.h" #include "qpushbutton.h" #include "qstringlist.h" #include "qtextedit.h" #include "qdialog_p.h" #include "qpixmap.h" #include "qmetaobject.h" #include "qthread.h" #include "qqueue.h" #include "qset.h" #include #include #ifdef Q_OS_WINCE extern bool qt_wince_is_mobile(); //defined in qguifunctions_wince.cpp extern bool qt_wince_is_high_dpi(); //defined in qguifunctions_wince.cpp #include "qguifunctions_wince.h" #endif QT_BEGIN_NAMESPACE class QErrorMessagePrivate : public QDialogPrivate { Q_DECLARE_PUBLIC(QErrorMessage) public: QPushButton * ok; QCheckBox * again; QTextEdit * errors; QLabel * icon; QQueue > pending; QSet doNotShow; QSet doNotShowType; QString currentMessage; QString currentType; bool nextPending(); void retranslateStrings(); }; class QErrorMessageTextView : public QTextEdit { public: QErrorMessageTextView(QWidget *parent) : QTextEdit(parent) { setReadOnly(true); } virtual QSize minimumSizeHint() const; virtual QSize sizeHint() const; }; QSize QErrorMessageTextView::minimumSizeHint() const { #ifdef Q_OS_WINCE if (qt_wince_is_mobile()) if (qt_wince_is_high_dpi()) return QSize(200, 200); else return QSize(100, 100); else return QSize(70, 70); #else return QSize(50, 50); #endif } QSize QErrorMessageTextView::sizeHint() const { #ifdef Q_OS_WINCE if (qt_wince_is_mobile()) if (qt_wince_is_high_dpi()) return QSize(400, 200); else return QSize(320, 120); else return QSize(300, 100); #else return QSize(250, 75); #endif } /*! \class QErrorMessage \brief The QErrorMessage class provides an error message display dialog. \ingroup dialogs \ingroup misc An error message widget consists of a text label and a checkbox. The checkbox lets the user control whether the same error message will be displayed again in the future, typically displaying the text, "Show this message again" translated into the appropriate local language. For production applications, the class can be used to display messages which the user only needs to see once. To use QErrorMessage like this, you create the dialog in the usual way, and show it by calling the showMessage() slot or connecting signals to it. The static qtHandler() function installs a message handler using qInstallMsgHandler() and creates a QErrorMessage that displays qDebug(), qWarning() and qFatal() messages. This is most useful in environments where no console is available to display warnings and error messages. In both cases QErrorMessage will queue pending messages and display them in order, with each new message being shown as soon as the user has accepted the previous message. Once the user has specified that a message is not to be shown again it is automatically skipped, and the dialog will show the next appropriate message in the queue. The \l{dialogs/standarddialogs}{Standard Dialogs} example shows how to use QErrorMessage as well as other built-in Qt dialogs. \img qerrormessage.png \sa QMessageBox, QStatusBar::showMessage(), {Standard Dialogs Example} */ static QErrorMessage * qtMessageHandler = 0; static void deleteStaticcQErrorMessage() // post-routine { if (qtMessageHandler) { delete qtMessageHandler; qtMessageHandler = 0; } } static bool metFatal = false; static void jump(QtMsgType t, const char * m) { if (!qtMessageHandler) return; QString rich; switch (t) { case QtDebugMsg: default: rich = QErrorMessage::tr("Debug Message:"); break; case QtWarningMsg: rich = QErrorMessage::tr("Warning:"); break; case QtFatalMsg: rich = QErrorMessage::tr("Fatal Error:"); } rich = QString::fromLatin1("

%1

").arg(rich); rich += Qt::convertFromPlainText(QLatin1String(m), Qt::WhiteSpaceNormal); // ### work around text engine quirk if (rich.endsWith(QLatin1String("

"))) rich.chop(4); if (!metFatal) { if (QThread::currentThread() == qApp->thread()) { qtMessageHandler->showMessage(rich); } else { QMetaObject::invokeMethod(qtMessageHandler, "showMessage", Qt::QueuedConnection, Q_ARG(QString, rich)); } metFatal = (t == QtFatalMsg); } } /*! Constructs and installs an error handler window with the given \a parent. */ QErrorMessage::QErrorMessage(QWidget * parent) : QDialog(*new QErrorMessagePrivate, parent) { Q_D(QErrorMessage); QGridLayout * grid = new QGridLayout(this); d->icon = new QLabel(this); #ifndef QT_NO_MESSAGEBOX d->icon->setPixmap(QMessageBox::standardIcon(QMessageBox::Information)); d->icon->setAlignment(Qt::AlignHCenter | Qt::AlignTop); #endif grid->addWidget(d->icon, 0, 0, Qt::AlignTop); d->errors = new QErrorMessageTextView(this); grid->addWidget(d->errors, 0, 1); d->again = new QCheckBox(this); d->again->setChecked(true); grid->addWidget(d->again, 1, 1, Qt::AlignTop); d->ok = new QPushButton(this); #ifdef Q_OS_WINCE d->ok->setFixedSize(0,0); #endif connect(d->ok, SIGNAL(clicked()), this, SLOT(accept())); d->ok->setFocus(); grid->addWidget(d->ok, 2, 0, 1, 2, Qt::AlignCenter); grid->setColumnStretch(1, 42); grid->setRowStretch(0, 42); d->retranslateStrings(); } /*! Destroys the error message dialog. */ QErrorMessage::~QErrorMessage() { if (this == qtMessageHandler) { qtMessageHandler = 0; QtMsgHandler tmp = qInstallMsgHandler(0); // in case someone else has later stuck in another... if (tmp != jump) qInstallMsgHandler(tmp); } } /*! \reimp */ void QErrorMessage::done(int a) { Q_D(QErrorMessage); if (!d->again->isChecked() && !d->currentMessage.isEmpty() && d->currentType.isEmpty()) { d->doNotShow.insert(d->currentMessage); } if (!d->again->isChecked() && !d->currentType.isEmpty()) { d->doNotShowType.insert(d->currentType); } d->currentMessage.clear(); d->currentType.clear(); if (!d->nextPending()) { QDialog::done(a); if (this == qtMessageHandler && metFatal) exit(1); } } /*! Returns a pointer to a QErrorMessage object that outputs the default Qt messages. This function creates such an object, if there isn't one already. */ QErrorMessage * QErrorMessage::qtHandler() { if (!qtMessageHandler) { qtMessageHandler = new QErrorMessage(0); qAddPostRoutine(deleteStaticcQErrorMessage); // clean up qtMessageHandler->setWindowTitle(qApp->applicationName()); qInstallMsgHandler(jump); } return qtMessageHandler; } /*! \internal */ bool QErrorMessagePrivate::nextPending() { while (!pending.isEmpty()) { QPair pendingMessage = pending.dequeue(); QString message = pendingMessage.first; QString type = pendingMessage.second; if (!message.isEmpty() && ((type.isEmpty() && !doNotShow.contains(message)) || (!type.isEmpty() && !doNotShowType.contains(type)))) { #ifndef QT_NO_TEXTHTMLPARSER errors->setHtml(message); #else errors->setPlainText(message); #endif currentMessage = message; currentType = type; return true; } } return false; } /*! Shows the given message, \a message, and returns immediately. If the user has requested for the message not to be shown again, this function does nothing. Normally, the message is displayed immediately. However, if there are pending messages, it will be queued to be displayed later. */ void QErrorMessage::showMessage(const QString &message) { Q_D(QErrorMessage); if (d->doNotShow.contains(message)) return; d->pending.enqueue(qMakePair(message,QString())); if (!isVisible() && d->nextPending()) show(); } /*! \since 4.5 \overload Shows the given message, \a message, and returns immediately. If the user has requested for messages of type, \a type, not to be shown again, this function does nothing. Normally, the message is displayed immediately. However, if there are pending messages, it will be queued to be displayed later. \sa showMessage() */ void QErrorMessage::showMessage(const QString &message, const QString &type) { Q_D(QErrorMessage); if (d->doNotShow.contains(message) && d->doNotShowType.contains(type)) return; d->pending.push_back(qMakePair(message,type)); if (!isVisible() && d->nextPending()) show(); } /*! \reimp */ void QErrorMessage::changeEvent(QEvent *e) { Q_D(QErrorMessage); if (e->type() == QEvent::LanguageChange) { d->retranslateStrings(); } QDialog::changeEvent(e); } void QErrorMessagePrivate::retranslateStrings() { again->setText(QErrorMessage::tr("&Show this message again")); ok->setText(QErrorMessage::tr("&OK")); } /*! \fn void QErrorMessage::message(const QString & message) Use showMessage(\a message) instead. */ QT_END_NAMESPACE #endif // QT_NO_ERRORMESSAGE