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****************************************************************************/

#include "customwidget.h"

#include "formbuilder.h"

#include "formbuilderextra_p.h"

#include "ui4_p.h"

#include <QtGui/QtGui>

#include <QtCore/QCoreApplication>

QT_BEGIN_NAMESPACE

#ifdef QFORMINTERNAL_NAMESPACE

namespace QFormInternal {

#endif

/*!

    \class QFormBuilder

    \brief The QFormBuilder class is used to dynamically construct

    user interfaces from UI files at run-time.

    \inmodule QtDesigner

    The QFormBuilder class provides a mechanism for dynamically

    creating user interfaces at run-time, based on UI files

    created with \QD. For example:

    \snippet doc/src/snippets/code/tools_designer_src_lib_uilib_formbuilder.cpp 0

    By including the user interface in the example's resources (\c

    myForm.qrc), we ensure that it will be present when the example is

    run:

    \snippet doc/src/snippets/code/tools_designer_src_lib_uilib_formbuilder.cpp 1

    QFormBuilder extends the QAbstractFormBuilder base class with a

    number of functions that are used to support custom widget

    plugins:

    \list

    \o pluginPaths() returns the list of paths that the form builder

       searches when loading custom widget plugins.

    \o addPluginPath() allows additional paths to be registered with

       the form builder.

    \o setPluginPath() is used to replace the existing list of paths

       with a list obtained from some other source.

    \o clearPluginPaths() removes all paths registered with the form

       builder.

    \o customWidgets() returns a list of interfaces to plugins that

       can be used to create new instances of registered custom widgets.

    \endlist

    The QFormBuilder class is typically used by custom components and

    applications that embed \QD. Standalone applications that need to

    dynamically generate user interfaces at run-time use the

    QUiLoader class, found in the QtUiTools module.

    \sa QAbstractFormBuilder, {QtUiTools Module}

*/

/*!

    \fn QFormBuilder::QFormBuilder()

    Constructs a new form builder.

*/

QFormBuilder::QFormBuilder() : QAbstractFormBuilder()

{

}

/*!

    Destroys the form builder.

*/

QFormBuilder::~QFormBuilder()

{

}

/*!

    \internal

*/

QWidget *QFormBuilder::create(DomWidget *ui_widget, QWidget *parentWidget)

{

    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);

    if (!fb->parentWidgetIsSet())

        fb->setParentWidget(parentWidget);

    // Is this a QLayoutWidget with a margin of 0: Not a known page-based

    // container and no method for adding pages registered.

    fb->setProcessingLayoutWidget(false);

    if (ui_widget->attributeClass() == QFormBuilderStrings::instance().qWidgetClass && !ui_widget->hasAttributeNative()

            && parentWidget

#ifndef QT_NO_MAINWINDOW

            && !qobject_cast<QMainWindow *>(parentWidget)

#endif

#ifndef QT_NO_TOOLBOX

            && !qobject_cast<QToolBox *>(parentWidget)

#endif

#ifndef QT_NO_STACKEDWIDGET

            && !qobject_cast<QStackedWidget *>(parentWidget)

#endif

#ifndef QT_NO_STACKEDWIDGET

            && !qobject_cast<QTabWidget *>(parentWidget)

#endif

#ifndef QT_NO_SCROLLAREA

            && !qobject_cast<QScrollArea *>(parentWidget)

#endif

#ifndef QT_NO_MDIAREA

            && !qobject_cast<QMdiArea *>(parentWidget)

#endif

#ifndef QT_NO_DOCKWIDGET

            && !qobject_cast<QDockWidget *>(parentWidget)

#endif

        ) {

        const QString parentClassName = QLatin1String(parentWidget->metaObject()->className());

        if (!fb->isCustomWidgetContainer(parentClassName))

            fb->setProcessingLayoutWidget(true);

    }

    return QAbstractFormBuilder::create(ui_widget, parentWidget);

}

/*!

    \internal

*/

QWidget *QFormBuilder::createWidget(const QString &widgetName, QWidget *parentWidget, const QString &name)

{

    if (widgetName.isEmpty()) {

        //: Empty class name passed to widget factory method

        qWarning() << QCoreApplication::translate("QFormBuilder", "An empty class name was passed on to %1 (object name: '%2').").arg(QString::fromUtf8(Q_FUNC_INFO), name);

        return 0;

    }

    QWidget *w = 0;

#ifndef QT_NO_TABWIDGET

    if (qobject_cast<QTabWidget*>(parentWidget))

        parentWidget = 0;

#endif

#ifndef QT_NO_STACKEDWIDGET

    if (qobject_cast<QStackedWidget*>(parentWidget))

        parentWidget = 0;

#endif

#ifndef QT_NO_TOOLBOX

    if (qobject_cast<QToolBox*>(parentWidget))

        parentWidget = 0;

#endif

    // ### special-casing for Line (QFrame) -- fix for 4.2

    do {

        if (widgetName == QFormBuilderStrings::instance().lineClass) {

            w = new QFrame(parentWidget);

            static_cast<QFrame*>(w)->setFrameStyle(QFrame::HLine | QFrame::Sunken);

            break;

        }

        const QByteArray widgetNameBA = widgetName.toUtf8();

        const char *widgetNameC = widgetNameBA.constData();

        if (w) { // symmetry for macro

        }

#define DECLARE_LAYOUT(L, C)

#define DECLARE_COMPAT_WIDGET(W, C)

#define DECLARE_WIDGET(W, C) else if (!qstrcmp(widgetNameC, #W)) { Q_ASSERT(w == 0); w = new W(parentWidget); }

#define DECLARE_WIDGET_1(W, C) else if (!qstrcmp(widgetNameC, #W)) { Q_ASSERT(w == 0); w = new W(0, parentWidget); }

#include "widgets.table"

#undef DECLARE_COMPAT_WIDGET

#undef DECLARE_LAYOUT

#undef DECLARE_WIDGET

#undef DECLARE_WIDGET_1

        if (w)

            break;

        // try with a registered custom widget

        QDesignerCustomWidgetInterface *factory = m_customWidgets.value(widgetName);

        if (factory != 0)

            w = factory->createWidget(parentWidget);

    } while(false);

    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);

    if (w == 0) { // Attempt to instantiate base class of promoted/custom widgets

        const QString baseClassName = fb->customWidgetBaseClass(widgetName);

        if (!baseClassName.isEmpty()) {

            qWarning() << QCoreApplication::translate("QFormBuilder", "QFormBuilder was unable to create a custom widget of the class '%1'; defaulting to base class '%2'.").arg(widgetName, baseClassName);

            return createWidget(baseClassName, parentWidget, name);

        }

    }

    if (w == 0) { // nothing to do

        qWarning() << QCoreApplication::translate("QFormBuilder", "QFormBuilder was unable to create a widget of the class '%1'.").arg(widgetName);

        return 0;

    }

    w->setObjectName(name);

    if (qobject_cast<QDialog *>(w))

        w->setParent(parentWidget);

    return w;

}

/*!

    \internal

*/

QLayout *QFormBuilder::createLayout(const QString &layoutName, QObject *parent, const QString &name)

{

    QLayout *l = 0;

    QWidget *parentWidget = qobject_cast<QWidget*>(parent);

    QLayout *parentLayout = qobject_cast<QLayout*>(parent);

    Q_ASSERT(parentWidget || parentLayout);

#define DECLARE_WIDGET(W, C)

#define DECLARE_COMPAT_WIDGET(W, C)

#define DECLARE_LAYOUT(L, C) \

    if (layoutName == QLatin1String(#L)) { \

        Q_ASSERT(l == 0); \

        l = parentLayout \

            ? new L() \

            : new L(parentWidget); \

    }

#include "widgets.table"

#undef DECLARE_LAYOUT

#undef DECLARE_COMPAT_WIDGET

#undef DECLARE_WIDGET

    if (l) {

        l->setObjectName(name);

        if (parentLayout) {

            QWidget *w = qobject_cast<QWidget *>(parentLayout->parent());

            if (w && w->inherits("Q3GroupBox")) {

                l->setContentsMargins(w->style()->pixelMetric(QStyle::PM_LayoutLeftMargin),

                                    w->style()->pixelMetric(QStyle::PM_LayoutTopMargin),

                                    w->style()->pixelMetric(QStyle::PM_LayoutRightMargin),

                                    w->style()->pixelMetric(QStyle::PM_LayoutBottomMargin));

                QGridLayout *grid = qobject_cast<QGridLayout *>(l);

                if (grid) {

                    grid->setHorizontalSpacing(-1);

                    grid->setVerticalSpacing(-1);

                } else {

                    l->setSpacing(-1);

                }

                l->setAlignment(Qt::AlignTop);

            }

        }

    } else {

        qWarning() << QCoreApplication::translate("QFormBuilder", "The layout type `%1' is not supported.").arg(layoutName);

    }

    return l;

}

/*!

    \internal

*/

bool QFormBuilder::addItem(DomLayoutItem *ui_item, QLayoutItem *item, QLayout *layout)

{

    return QAbstractFormBuilder::addItem(ui_item, item, layout);

}

/*!

    \internal

*/

bool QFormBuilder::addItem(DomWidget *ui_widget, QWidget *widget, QWidget *parentWidget)

{

    return QAbstractFormBuilder::addItem(ui_widget, widget, parentWidget);

}

/*!

    \internal

*/

QWidget *QFormBuilder::widgetByName(QWidget *topLevel, const QString &name)

{

    Q_ASSERT(topLevel);

    if (topLevel->objectName() == name)

        return topLevel;

    return qFindChild<QWidget*>(topLevel, name);

}

static QObject *objectByName(QWidget *topLevel, const QString &name)

{

    Q_ASSERT(topLevel);

    if (topLevel->objectName() == name)

        return topLevel;

    return qFindChild<QObject*>(topLevel, name);

}

/*!

    \internal

*/

void QFormBuilder::createConnections(DomConnections *ui_connections, QWidget *widget)

{

    typedef QList<DomConnection*> DomConnectionList;

    Q_ASSERT(widget != 0);

    if (ui_connections == 0)

        return;

    const DomConnectionList connections = ui_connections->elementConnection();

    if (!connections.empty()) {

        const DomConnectionList::const_iterator cend = connections.constEnd();

        for (DomConnectionList::const_iterator it = connections.constBegin(); it != cend; ++it) {

            QObject *sender = objectByName(widget, (*it)->elementSender());

            QObject *receiver = objectByName(widget, (*it)->elementReceiver());

            if (!sender || !receiver)

                continue;

            QByteArray sig = (*it)->elementSignal().toUtf8();

            sig.prepend("2");

            QByteArray sl = (*it)->elementSlot().toUtf8();

            sl.prepend("1");

            QObject::connect(sender, sig, receiver, sl);

        }

    }

}

/*!

    \internal

*/

QWidget *QFormBuilder::create(DomUI *ui, QWidget *parentWidget)

{

    return QAbstractFormBuilder::create(ui, parentWidget);

}

/*!

    \internal

*/

QLayout *QFormBuilder::create(DomLayout *ui_layout, QLayout *layout, QWidget *parentWidget)

{

    QFormBuilderExtra *fb = QFormBuilderExtra::instance(this);

    // Is this a temporary layout widget used to represent QLayout hierarchies in Designer?

    // Set its margins to 0.

    bool layoutWidget = fb->processingLayoutWidget();

    QLayout *l = QAbstractFormBuilder::create(ui_layout, layout, parentWidget);

    if (layoutWidget) {

        const QFormBuilderStrings &strings = QFormBuilderStrings::instance();

        int left, top, right, bottom;

        left = top = right = bottom = 0;

        const DomPropertyHash properties = propertyMap(ui_layout->elementProperty());

        if (DomProperty *prop = properties.value(strings.leftMarginProperty))

            left = prop->elementNumber();

        if (DomProperty *prop = properties.value(strings.topMarginProperty))

            top = prop->elementNumber();

        if (DomProperty *prop = properties.value(strings.rightMarginProperty))

            right = prop->elementNumber();

        if (DomProperty *prop = properties.value(strings.bottomMarginProperty))

            bottom = prop->elementNumber();

        l->setContentsMargins(left, top, right, bottom);

        fb->setProcessingLayoutWidget(false);

    }

    return l;

}

/*!

    \internal

*/

QLayoutItem *QFormBuilder::create(DomLayoutItem *ui_layoutItem, QLayout *layout, QWidget *parentWidget)

{

    return QAbstractFormBuilder::create(ui_layoutItem, layout, parentWidget);

}

/*!

    \internal

*/

QAction *QFormBuilder::create(DomAction *ui_action, QObject *parent)

{

    return QAbstractFormBuilder::create(ui_action, parent);

}

/*!

    \internal

*/

QActionGroup *QFormBuilder::create(DomActionGroup *ui_action_group, QObject *parent)

{

    return QAbstractFormBuilder::create(ui_action_group, parent);

}

/*!

    Returns the list of paths the form builder searches for plugins.

    \sa addPluginPath()

*/

QStringList QFormBuilder::pluginPaths() const

{

    return m_pluginPaths;

}

/*!

    Clears the list of paths that the form builder uses to search for

    custom widget plugins.

    \sa pluginPaths()

*/

void QFormBuilder::clearPluginPaths()

{

    m_pluginPaths.clear();

    updateCustomWidgets();

}

/*!

    Adds a new plugin path specified by \a pluginPath to the list of

    paths that will be searched by the form builder when loading a

    custom widget plugin.

    \sa setPluginPath(), clearPluginPaths()

*/

void QFormBuilder::addPluginPath(const QString &pluginPath)

{

    m_pluginPaths.append(pluginPath);

    updateCustomWidgets();

}

/*!

    Sets the list of plugin paths to the list specified by \a pluginPaths.

    \sa addPluginPath()

*/

void QFormBuilder::setPluginPath(const QStringList &pluginPaths)

{

    m_pluginPaths = pluginPaths;

    updateCustomWidgets();

}

static void insertPlugins(QObject *o, QMap<QString, QDesignerCustomWidgetInterface*> *customWidgets)

{

    // step 1) try with a normal plugin

    if (QDesignerCustomWidgetInterface *iface = qobject_cast<QDesignerCustomWidgetInterface *>(o)) {

        customWidgets->insert(iface->name(), iface);

        return;

    }

    // step 2) try with a collection of plugins

    if (QDesignerCustomWidgetCollectionInterface *c = qobject_cast<QDesignerCustomWidgetCollectionInterface *>(o)) {

        foreach (QDesignerCustomWidgetInterface *iface, c->customWidgets())

            customWidgets->insert(iface->name(), iface);

    }

}

/*!

    \internal

*/

void QFormBuilder::updateCustomWidgets()

{

    m_customWidgets.clear();

    foreach (const QString &path, m_pluginPaths) {

        const QDir dir(path);

        const QStringList candidates = dir.entryList(QDir::Files);

        foreach (const QString &plugin, candidates) {

            if (!QLibrary::isLibrary(plugin))

                continue;

            QString loaderPath = path;

            loaderPath += QLatin1Char('/');

            loaderPath += plugin;

            QPluginLoader loader(loaderPath);

            if (loader.load())

                insertPlugins(loader.instance(), &m_customWidgets);

        }

    }

    // Check statically linked plugins

    const QObjectList staticPlugins = QPluginLoader::staticInstances();

    if (!staticPlugins.empty())

        foreach (QObject *o, staticPlugins)

            insertPlugins(o, &m_customWidgets);

}

/*!

    \fn QList<QDesignerCustomWidgetInterface*> QFormBuilder::customWidgets() const

    Returns a list of the available plugins.

*/

QList<QDesignerCustomWidgetInterface*> QFormBuilder::customWidgets() const

{