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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the Qt Designer of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    13 ** contained in the Technology Preview License Agreement accompanying

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "dialoggui_p.h"

    43 

    44 #include <QtGui/QFileIconProvider>

    45 #include <QtGui/QIcon>

    46 #include <QtGui/QImage>

    47 #include <QtGui/QImageReader>

    48 #include <QtGui/QPixmap>

    49 

    50 #include <QtCore/QFileInfo>

    51 #include <QtCore/QFile>

    52 #include <QtCore/QSet>

    53 

    54 // QFileDialog on X11 does not provide an image preview. Display icons.

    55 #ifdef Q_WS_X11

    56 #  define IMAGE_PREVIEW

    57 #endif

    58 

    59 QT_BEGIN_NAMESPACE

    60 

    61 namespace qdesigner_internal {

    62 

    63 // Icon provider that reads out the known image formats

    64 class IconProvider : public QFileIconProvider {

    65     Q_DISABLE_COPY(IconProvider)

    66 

    67 public:

    68     IconProvider();

    69     virtual QIcon icon (const QFileInfo &info) const;

    70 

    71     inline bool loadCheck(const QFileInfo &info) const;

    72     QImage loadImage(const QString &fileName) const;

    73 

    74 private:

    75     QSet<QString> m_imageFormats;

    76 };

    77 

    78 IconProvider::IconProvider()

    79 {

    80     // Determine a list of readable extensions (upper and lower case)

    81     typedef QList<QByteArray> ByteArrayList;

    82     const ByteArrayList fmts = QImageReader::supportedImageFormats();

    83     const ByteArrayList::const_iterator cend = fmts.constEnd();

    84     for (ByteArrayList::const_iterator it = fmts.constBegin(); it != cend; ++it) {

    85         const QString suffix = QString::fromUtf8(it->constData());

    86         m_imageFormats.insert(suffix.toLower());

    87         m_imageFormats.insert(suffix.toUpper());

    88 

    89     }

    90 }

    91 

    92 // Check by extension and type if this appears to be a loadable image

    93 bool IconProvider::loadCheck(const QFileInfo &info) const

    94 {

    95     if (info.isFile() && info.isReadable()) {

    96         const QString suffix = info.suffix();

    97         if (!suffix.isEmpty())

    98             return m_imageFormats.contains(suffix);

    99     }

   100     return false;

   101 }

   102 

   103 QImage IconProvider::loadImage(const QString &fileName) const

   104 {

   105     QFile file(fileName);

   106     if (file.open(QIODevice::ReadOnly)) {

   107         QImageReader imgReader(&file);

   108         if (imgReader.canRead()) {

   109             QImage image;

   110             if (imgReader.read(&image))

   111                 return image;

   112         }

   113     }

   114     return QImage();

   115 }

   116 

   117 QIcon IconProvider::icon (const QFileInfo &info) const

   118 {

   119     // Don't get stuck on large images.

   120     const qint64 maxSize = 131072;

   121     if (loadCheck(info) && info.size() < maxSize) {

   122         const QImage image = loadImage(info.absoluteFilePath());

   123         if (!image.isNull())

   124             return QIcon(QPixmap::fromImage(image, Qt::ThresholdDither|Qt::AutoColor));

   125     }

   126     return QFileIconProvider::icon(info);

   127 }

   128 

   129 // ---------------- DialogGui

   130 DialogGui::DialogGui() :

   131     m_iconProvider(0)

   132 {

   133 }

   134 

   135 DialogGui::~DialogGui()

   136 {

   137     delete m_iconProvider;

   138 }

   139 

   140 QFileIconProvider *DialogGui::ensureIconProvider()

   141 {

   142     if (!m_iconProvider)

   143         m_iconProvider = new IconProvider;

   144     return m_iconProvider;

   145 }

   146 

   147 QMessageBox::StandardButton

   148         DialogGui::message(QWidget *parent, Message /*context*/, QMessageBox::Icon icon,

   149                            const QString &title, const QString &text, QMessageBox::StandardButtons buttons,

   150                            QMessageBox::StandardButton defaultButton)

   151 {

   152     QMessageBox::StandardButton rc = QMessageBox::NoButton;

   153     switch (icon) {

   154     case QMessageBox::Information:

   155         rc = QMessageBox::information(parent, title, text, buttons, defaultButton);

   156         break;

   157     case QMessageBox::Warning:

   158         rc = QMessageBox::warning(parent, title, text, buttons, defaultButton);

   159         break;

   160     case QMessageBox::Critical:

   161         rc = QMessageBox::critical(parent, title, text, buttons, defaultButton);

   162         break;

   163     case QMessageBox::Question:

   164         rc = QMessageBox::question(parent, title, text, buttons, defaultButton);

   165         break;

   166     case QMessageBox::NoIcon:

   167         break;

   168     }

   169     return rc;

   170 }

   171 

   172 QMessageBox::StandardButton

   173         DialogGui::message(QWidget *parent, Message /*context*/, QMessageBox::Icon icon,

   174                           const QString &title, const QString &text, const QString &informativeText,

   175                           QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton)

   176 {

   177     QMessageBox msgBox(icon, title, text, buttons, parent);

   178     msgBox.setDefaultButton(defaultButton);

   179     msgBox.setInformativeText(informativeText);

   180     return static_cast<QMessageBox::StandardButton>(msgBox.exec());

   181 }

   182 

   183 QMessageBox::StandardButton

   184         DialogGui::message(QWidget *parent, Message /*context*/, QMessageBox::Icon icon,

   185                           const QString &title, const QString &text, const QString &informativeText, const QString &detailedText,

   186                           QMessageBox::StandardButtons buttons, QMessageBox::StandardButton defaultButton)

   187 {

   188     QMessageBox msgBox(icon, title, text, buttons, parent);

   189     msgBox.setDefaultButton(defaultButton);

   190     msgBox.setInformativeText(informativeText);

   191     msgBox.setDetailedText(detailedText);

   192     return static_cast<QMessageBox::StandardButton>(msgBox.exec());

   193 }

   194 

   195 QString DialogGui::getExistingDirectory(QWidget *parent, const QString &caption, const QString &dir, QFileDialog::Options options)

   196 {

   197     return QFileDialog::getExistingDirectory(parent, caption, dir, options);

   198 }

   199 

   200 QString DialogGui::getOpenFileName(QWidget *parent, const QString &caption, const QString &dir, const QString &filter, QString *selectedFilter, QFileDialog::Options options)

   201 {

   202     return QFileDialog::getOpenFileName(parent, caption, dir, filter, selectedFilter, options);

   203 }

   204 

   205 QStringList DialogGui::getOpenFileNames(QWidget *parent, const QString &caption, const QString &dir, const QString &filter, QString *selectedFilter, QFileDialog::Options options)

   206 {

   207     return QFileDialog::getOpenFileNames(parent, caption, dir, filter, selectedFilter, options);

   208 }

   209 

   210 QString DialogGui::getSaveFileName(QWidget *parent, const QString &caption, const QString &dir, const QString &filter, QString *selectedFilter, QFileDialog::Options options)

   211 {

   212     return QFileDialog::getSaveFileName(parent, caption, dir, filter, selectedFilter, options);

   213 }

   214 

   215 void DialogGui::initializeImageFileDialog(QFileDialog &fileDialog, QFileDialog::Options options, QFileDialog::FileMode fm)

   216 {

   217     fileDialog.setConfirmOverwrite( !(options & QFileDialog::DontConfirmOverwrite) );

   218     fileDialog.setResolveSymlinks( !(options & QFileDialog::DontResolveSymlinks) );

   219     fileDialog.setIconProvider(ensureIconProvider());

   220     fileDialog.setFileMode(fm);

   221 }

   222 

   223 QString DialogGui::getOpenImageFileName(QWidget *parent, const QString &caption, const QString &dir, const QString &filter, QString *selectedFilter, QFileDialog::Options options )

   224 {

   225 

   226 #ifdef IMAGE_PREVIEW

   227     QFileDialog fileDialog(parent, caption, dir, filter);

   228     initializeImageFileDialog(fileDialog, options, QFileDialog::ExistingFile);

   229     if (fileDialog.exec() != QDialog::Accepted)

   230         return QString();

   231 

   232     const QStringList selectedFiles = fileDialog.selectedFiles();

   233     if (selectedFiles.empty())

   234         return QString();

   235 

   236     if (selectedFilter)

   237         *selectedFilter =  fileDialog.selectedFilter();

   238 

   239     return selectedFiles.front();

   240 #else

   241     return getOpenFileName(parent, caption, dir, filter, selectedFilter, options);

   242 #endif

   243 }

   244 

   245 QStringList DialogGui::getOpenImageFileNames(QWidget *parent, const QString &caption, const QString &dir, const QString &filter, QString *selectedFilter, QFileDialog::Options options )

   246 {

   247 #ifdef IMAGE_PREVIEW

   248     QFileDialog fileDialog(parent, caption, dir, filter);

   249     initializeImageFileDialog(fileDialog, options, QFileDialog::ExistingFiles);

   250     if (fileDialog.exec() != QDialog::Accepted)

   251         return QStringList();

   252 

   253     const QStringList selectedFiles = fileDialog.selectedFiles();

   254     if (!selectedFiles.empty() && selectedFilter)

   255         *selectedFilter =  fileDialog.selectedFilter();

   256 

   257     return selectedFiles;

   258 #else

   259       return getOpenFileNames(parent, caption, dir, filter, selectedFilter, options);

   260 #endif

   261 }

   262 

   263 }

   264 

   265 QT_END_NAMESPACE