path: root/src/dialogs/qquickplatformfiledialog.cpp

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#include "qquickplatformfiledialog_p.h"
#include "qquickitem.h"

#include <private/qguiapplication_p.h>
#include <QWindow>
#include <QQuickView>
#include <QQuickWindow>

QT_BEGIN_NAMESPACE

/*!
    \qmltype FileDialog
    \instantiates QQuickPlatformFileDialog
    \inqmlmodule QtQuick.Dialogs
    \ingroup qtquickdialogs
    \brief Dialog component for choosing files from a local filesystem.
    \since 5.1

    FileDialog provides a basic file chooser: it allows the user to select
    existing files and/or directories, or create new filenames. The dialog is
    initially invisible. You need to set the properties as desired first, then
    set \l visible to true or call \l open().

    Here is a minimal example to open a file dialog and exit after the user
    chooses a file:

    \qml
    import QtQuick 2.2
    import QtQuick.Dialogs 1.0

    FileDialog {
        id: fileDialog
        title: "Please choose a file"
        folder: shortcuts.home
        onAccepted: {
            console.log("You chose: " + fileDialog.fileUrls)
            Qt.quit()
        }
        onRejected: {
            console.log("Canceled")
            Qt.quit()
        }
        Component.onCompleted: visible = true
    }
    \endqml

    A FileDialog window is automatically transient for its parent window. So
    whether you declare the dialog inside an \l Item or inside a \l Window, the
    dialog will appear centered over the window containing the item, or over
    the Window that you declared.

    The implementation of FileDialog will be a platform file dialog if
    possible. If that isn't possible, then it will try to instantiate a
    \l QFileDialog. If that also isn't possible, then it will fall back to a QML
    implementation, DefaultFileDialog.qml. In that case you can customize the
    appearance by editing this file. DefaultFileDialog.qml contains a Rectangle
    to hold the dialog's contents, because certain embedded systems do not
    support multiple top-level windows. When the dialog becomes visible, it
    will automatically be wrapped in a Window if possible, or simply reparented
    on top of the main window if there can only be one window.

    The QML implementation has a sidebar containing \l shortcuts to common
    platform-specific locations, and user-modifiable favorites. It uses
    application-specific \l {Qt.labs.settings}{settings} to store the user's
    favorites, as well as other user-modifiable state, such as whether or
    not the sidebar is shown, the positions of the splitters, and the dialog
    size. The settings are stored in a section called \c QQControlsFileDialog
    of the application-specific \l QSettings. For example when testing an
    application with the qml tool, the \c QQControlsFileDialog section will be
    created in the \c {Qml Runtime} settings file (or registry entry). If an
    application is started via a custom C++ main() function, it is recommended
    to set the
    \l {QCoreApplication::applicationName}{name},
    \l {QCoreApplication::organizationName}{organization} and
    \l {QCoreApplication::organizationDomain}{domain} in order to control
    the location of the application's settings. If you use
    \l {Qt.labs.settings}{Settings} objects in other parts of an
    application, they will be stored in other sections of the same file.

    \l QFileDialog stores its settings globally instead of per-application.
    Platform-native file dialogs may or may not store settings in various
    platform-dependent ways.
*/

/*!
    \qmlsignal QtQuick::Dialogs::FileDialog::accepted

    This signal is emitted when the user has finished using the
    dialog. You can then inspect the \l fileUrl or \l fileUrls properties to
    get the selection.

    Example:

    \qml
    FileDialog {
        onAccepted: { console.log("Selected file: " + fileUrl) }
    }
    \endqml

    The corresponding handler is \c onAccepted.
*/

/*!
    \qmlsignal QtQuick::Dialogs::FileDialog::rejected

    This signal is emitted when the user has dismissed the dialog,
    either by closing the dialog window or by pressing the Cancel button.

    The corresponding handler is \c onRejected.
*/

/*!
    \class QQuickPlatformFileDialog
    \inmodule QtQuick.Dialogs
    \internal
    \since 5.1

    \brief The QQuickPlatformFileDialog class provides a file dialog

    The dialog is implemented via the QPlatformFileDialogHelper when possible;
    otherwise it falls back to a QFileDialog or a QML implementation.
*/

/*!
    Constructs a file dialog with parent window \a parent.
*/
QQuickPlatformFileDialog::QQuickPlatformFileDialog(QObject *parent) :
    QQuickFileDialog(parent)
{
}

/*!
    Destroys the file dialog.
*/
QQuickPlatformFileDialog::~QQuickPlatformFileDialog()
{
    if (m_dlgHelper)
        m_dlgHelper->hide();
    delete m_dlgHelper;
}

QList<QUrl> QQuickPlatformFileDialog::fileUrls() const
{
    if (m_dialogHelperInUse)
        return m_dlgHelper->selectedFiles();
    return QQuickFileDialog::fileUrls();
}

void QQuickPlatformFileDialog::setModality(Qt::WindowModality m)
{
#ifdef Q_OS_WIN
    // A non-modal native file dialog is not possible on Windows, so
    // be stubborn about it.  Emit modalityChanged() whether it changed
    // or not, to ensure that anything which depends on the property
    // will re-read the actual current value.
    if (m != Qt::ApplicationModal)
        m = Qt::ApplicationModal;
    if (m == m_modality)
        emit modalityChanged();
#endif
    QQuickAbstractFileDialog::setModality(m);
}

QPlatformFileDialogHelper *QQuickPlatformFileDialog::helper()
{
    QQuickItem *parentItem = qobject_cast<QQuickItem *>(parent());
    if (parentItem)
        m_parentWindow = parentItem->window();

    if ( !m_dlgHelper && QGuiApplicationPrivate::platformTheme()->
            usePlatformNativeDialog(QPlatformTheme::FileDialog) ) {
        m_dlgHelper = static_cast<QPlatformFileDialogHelper *>(QGuiApplicationPrivate::platformTheme()
           ->createPlatformDialogHelper(QPlatformTheme::FileDialog));
        if (!m_dlgHelper)
            return m_dlgHelper;
        m_dlgHelper->setOptions(m_options);
        connect(m_dlgHelper, SIGNAL(directoryEntered(QUrl)), this, SLOT(updateFolder(QUrl)));
        connect(m_dlgHelper, SIGNAL(filterSelected(QString)), this, SIGNAL(filterSelected()));
        connect(m_dlgHelper, SIGNAL(accept()), this, SLOT(accept()));
        connect(m_dlgHelper, SIGNAL(reject()), this, SLOT(reject()));
    }

    return m_dlgHelper;
}

/*!
    \qmlproperty bool FileDialog::visible

    This property holds whether the dialog is visible. By default this is
    false.

    \sa modality
*/

/*!
    \qmlproperty Qt::WindowModality FileDialog::modality

    Whether the dialog should be shown modal with respect to the window
    containing the dialog's parent Item, modal with respect to the whole
    application, or non-modal.

    By default it is \c Qt.WindowModal.

    Modality does not mean that there are any blocking calls to wait for the
    dialog to be accepted or rejected; it's only that the user will be
    prevented from interacting with the parent window and/or the application
    windows at the same time. You probably need to write an onAccepted handler
    to actually load or save the chosen file.
*/

/*!
    \qmlmethod void FileDialog::open()

    Shows the dialog to the user. It is equivalent to setting \l visible to
    true.
*/

/*!
    \qmlmethod void FileDialog::close()

    Closes the dialog.
*/

/*!
    \qmlproperty string FileDialog::title

    The title of the dialog window.
*/

/*!
    \qmlproperty bool FileDialog::selectExisting

    Whether only existing files or directories can be selected.

    By default, this property is true. This property must be set to the desired
    value before opening the dialog. Setting this property to false implies
    that the dialog is for naming a file to which to save something, or naming
    a folder to be created; therefore \l selectMultiple must be false.
*/

/*!
    \qmlproperty bool FileDialog::selectMultiple

    Whether more than one filename can be selected.

    By default, this property is false. This property must be set to the
    desired value before opening the dialog. Setting this property to true
    implies that \l selectExisting must be true.
*/

/*!
    \qmlproperty bool FileDialog::selectFolder

    Whether the selected item should be a folder.

    By default, this property is false. This property must be set to the
    desired value before opening the dialog. Setting this property to true
    implies that \l selectMultiple must be false and \l selectExisting must be
    true.
*/

/*!
    \qmlproperty url FileDialog::folder

    The path to the currently selected folder. Setting this property before
    invoking open() will cause the file browser to be initially positioned on
    the specified folder.

    The value of this property is also updated after the dialog is closed.

    By default, the url is empty.

    \note On iOS, if you set \a folder to \l{shortcuts}
        {shortcuts.pictures},
        a native image picker dialog will be used for accessing the user's photo album.
        The URL returned can be set as \l{Image::source}{source} for \l{Image}.
        This feature was added in Qt 5.5.

    \sa shortcuts
*/

/*!
    \qmlproperty Object FileDialog::shortcuts
    \since 5.5

    A map of some useful paths from QStandardPaths to their URLs.
    Each path is verified to exist on the user's computer before being added
    to this list, at the time when the FileDialog is created.

    \table
    \row
    \li \c desktop
    \li \l QStandardPaths::DesktopLocation
    \li The user's desktop directory.
    \row
    \li \c documents
    \li \l QStandardPaths::DocumentsLocation
    \li The directory containing user document files.
    \row
    \li \c home
    \li \l QStandardPaths::HomeLocation
    \li The user's home directory.
    \row
    \li \c music
    \li \l QStandardPaths::MusicLocation
    \li The directory containing the user's music or other audio files.
    \row
    \li \c movies
    \li \l QStandardPaths::MoviesLocation
    \li The directory containing the user's movies and videos.
    \row
    \li \c pictures
    \li \l QStandardPaths::PicturesLocation
    \li The directory containing the user's pictures or photos.  It is always
        a kind of \c file: URL; but on some platforms, it will be specialized,
        such that the FileDialog will be realized as a gallery browser dialog.
    \endtable

    For example, \c shortcuts.home will provide the URL of the user's
    home directory.
*/

/*!
    \qmlproperty list<string> FileDialog::nameFilters

    A list of strings to be used as file name filters. Each string can be a
    space-separated list of filters; filters may include the ? and * wildcards.
    The list of filters can also be enclosed in parentheses and a textual
    description of the filter can be provided.

    For example:

    \qml
    FileDialog {
        nameFilters: [ "Image files (*.jpg *.png)", "All files (*)" ]
    }
    \endqml

    \note Directories are not excluded by filters.
    \sa selectedNameFilter
*/

/*!
    \qmlproperty string FileDialog::selectedNameFilter

    Which of the \l nameFilters is currently selected.

    This property can be set before the dialog is visible, to set the default
    name filter, and can also be set while the dialog is visible to set the
    current name filter. It is also updated when the user selects a different
    filter.
*/

/*!
    \qmlproperty url FileDialog::fileUrl

    The path of the file which was selected by the user.

    \note This property is set only if exactly one file was selected. In all
    other cases, it will be empty.

    \sa fileUrls
*/

/*!
    \qmlproperty list<url> FileDialog::fileUrls

    The list of file paths which were selected by the user.
*/

/*!
    \qmlproperty bool FileDialog::sidebarVisible
    \since 5.4

    This property holds whether the sidebar in the dialog containing shortcuts
    and bookmarks is visible. By default it depends on the setting stored in
    the \c QQControlsFileDialog section of the application's
    \l {Qt.labs.settings}{Settings}.
*/

QT_END_NAMESPACE