Designer: Support alignment in box and grid layouts.

Extend ui-format by alignment-attribute for QLayoutItem,
handle it in uic and formbuilder.
Support in Designer by context menu.

Reviewed-by: Jarek Kobus <jaroslaw.kobus@nokia.com>
Task-number: QTBUG-3120

8 files changed, 329 insertions, 10 deletions

diff --git a/tools/designer/src/lib/shared/qdesigner_command2.cpp b/tools/designer/src/lib/shared/qdesigner_command2.cpp
index c16bf40..ce2128a 100644
--- a/tools/designer/src/lib/shared/qdesigner_command2.cpp
+++ b/tools/designer/src/lib/shared/qdesigner_command2.cpp
@@ -154,6 +154,68 @@ QString MorphLayoutCommand::formatDescription(QDesignerFormEditorInterface * /*
     return QApplication::translate("Command", "Change layout of '%1' from %2 to %3").arg(widgetName, oldName, newName);
 }
 
+LayoutAlignmentCommand::LayoutAlignmentCommand(QDesignerFormWindowInterface *formWindow) :
+    QDesignerFormWindowCommand(QApplication::translate("Command", "Change layout alignment"), formWindow),
+    m_newAlignment(0), m_oldAlignment(0), m_widget(0)
+{
+}
+
+bool LayoutAlignmentCommand::init(QWidget *w, Qt::Alignment alignment)
+{
+    bool enabled;
+    m_newAlignment = alignment;
+    m_oldAlignment = LayoutAlignmentCommand::alignmentOf(core(), w, &enabled);
+    m_widget = w;
+    return enabled;
+}
+
+void LayoutAlignmentCommand::redo()
+{
+    LayoutAlignmentCommand::applyAlignment(core(), m_widget, m_newAlignment);
+}
+
+void LayoutAlignmentCommand::undo()
+{
+    LayoutAlignmentCommand::applyAlignment(core(), m_widget, m_oldAlignment);
+}
+
+// Find out alignment and return whether command is enabled.
+Qt::Alignment LayoutAlignmentCommand::alignmentOf(const QDesignerFormEditorInterface *core, QWidget *w, bool *enabledIn)
+{
+    bool managed;
+    QLayout *layout;
+
+    if (enabledIn)
+        *enabledIn = false;
+    // Can only work on a managed layout
+    const LayoutInfo::Type type = LayoutInfo::laidoutWidgetType(core, w, &managed, &layout);
+    const bool enabled = layout && managed &&
+                         (type == LayoutInfo::HBox || type == LayoutInfo::VBox
+                          || type == LayoutInfo::Grid);
+    if (!enabled)
+        return Qt::Alignment(0);
+    // Get alignment
+    const int index = layout->indexOf(w);
+    Q_ASSERT(index >= 0);
+    if (enabledIn)
+        *enabledIn = true;
+    return layout->itemAt(index)->alignment();
+}
+
+void LayoutAlignmentCommand::applyAlignment(const QDesignerFormEditorInterface *core, QWidget *w, Qt::Alignment a)
+{
+    // Find layout and apply to item
+    QLayout *layout;
+    LayoutInfo::laidoutWidgetType(core, w, 0, &layout);
+    if (layout) {
+        const int index = layout->indexOf(w);
+        if (index >= 0) {
+            layout->itemAt(index)->setAlignment(a);
+            layout->update();
+        }
+    }
+}
+
 } // namespace qdesigner_internal
 
 QT_END_NAMESPACE
diff --git a/tools/designer/src/lib/shared/qdesigner_command2_p.h b/tools/designer/src/lib/shared/qdesigner_command2_p.h
index 5c7b9d6..4e9c95a 100644
--- a/tools/designer/src/lib/shared/qdesigner_command2_p.h
+++ b/tools/designer/src/lib/shared/qdesigner_command2_p.h
@@ -94,6 +94,28 @@ private:
     QWidget *m_layoutBase;
 };
 
+// Change the alignment of a widget in a managed grid/box layout cell.
+class LayoutAlignmentCommand : public QDesignerFormWindowCommand {
+    Q_DISABLE_COPY(LayoutAlignmentCommand)
+public:
+    explicit LayoutAlignmentCommand(QDesignerFormWindowInterface *formWindow);
+
+    bool init(QWidget *w, Qt::Alignment alignment);
+
+    virtual void redo();
+    virtual void undo();
+
+    // Find out alignment and return whether command is enabled.
+    static Qt::Alignment alignmentOf(const QDesignerFormEditorInterface *core, QWidget *w, bool *enabled = 0);
+
+private:
+    static void applyAlignment(const QDesignerFormEditorInterface *core, QWidget *w, Qt::Alignment a);
+
+    Qt::Alignment m_newAlignment;
+    Qt::Alignment m_oldAlignment;
+    QWidget *m_widget;
+};
+
 } // namespace qdesigner_internal
 
 QT_END_NAMESPACE
diff --git a/tools/designer/src/lib/shared/qdesigner_taskmenu.cpp b/tools/designer/src/lib/shared/qdesigner_taskmenu.cpp
index a607f35..cdb7d15 100644
--- a/tools/designer/src/lib/shared/qdesigner_taskmenu.cpp
+++ b/tools/designer/src/lib/shared/qdesigner_taskmenu.cpp
@@ -41,6 +41,7 @@
 
 #include "qdesigner_taskmenu_p.h"
 #include "qdesigner_command_p.h"
+#include "qdesigner_command2_p.h"
 #include "richtexteditor_p.h"
 #include "plaintexteditor_p.h"
 #include "stylesheeteditor_p.h"
@@ -180,10 +181,128 @@ QString ObjectNameDialog::newObjectName() const
 {
     return m_editor->text();
 }
+} // namespace
 
+namespace qdesigner_internal {
+
+// Sub menu displaying the alignment options of a widget in a managed
+// grid/box layout cell.
+class LayoutAlignmentMenu {
+public:
+    explicit LayoutAlignmentMenu(QObject *parent);
+
+    QAction *subMenuAction() const { return m_subMenuAction; }
+
+    void connect(QObject *receiver, const char *aSlot);
+
+    // Set up enabled state and checked actions according to widget (managed box/grid)
+    bool setAlignment(const QDesignerFormEditorInterface *core, QWidget *w);
+
+    // Return the currently checked alignment
+    Qt::Alignment alignment() const;
+
+private:
+    enum Actions { HorizNone, Left, HorizCenter, Right, VerticalNone, Top, VerticalCenter, Bottom };
+    static QAction *createAction(const QString &text, int data, QMenu *menu, QActionGroup *ag);
+
+    QAction *m_subMenuAction;
+    QActionGroup *m_horizGroup;
+    QActionGroup *m_verticalGroup;
+    QAction *m_actions[Bottom + 1];
+};
+
+QAction *LayoutAlignmentMenu::createAction(const QString &text, int data, QMenu *menu, QActionGroup *ag)
+{
+    QAction * a = new QAction(text, 0);
+    a->setCheckable(true);
+    a->setData(QVariant(data));
+    menu->addAction(a);
+    ag->addAction(a);
+    return a;
+}
+
+LayoutAlignmentMenu::LayoutAlignmentMenu(QObject *parent) :
+    m_subMenuAction(new QAction(QDesignerTaskMenu::tr("Layout Alignment"), parent)),
+    m_horizGroup(new QActionGroup(parent)),
+    m_verticalGroup(new QActionGroup(parent))
+{
+    m_horizGroup->setExclusive(true);
+    m_verticalGroup->setExclusive(true);
+
+    QMenu *menu = new QMenu;
+    m_subMenuAction->setMenu(menu);
+
+    m_actions[HorizNone] = createAction(QDesignerTaskMenu::tr("No Horizontal Alignment"), 0, menu, m_horizGroup);
+    m_actions[Left] = createAction(QDesignerTaskMenu::tr("Left"), Qt::AlignLeft, menu, m_horizGroup);
+    m_actions[HorizCenter] = createAction(QDesignerTaskMenu::tr("Center Horizontally"), Qt::AlignHCenter, menu, m_horizGroup);
+    m_actions[Right] = createAction(QDesignerTaskMenu::tr("Right"), Qt::AlignRight, menu, m_horizGroup);
+    menu->addSeparator();
+    m_actions[VerticalNone] = createAction(QDesignerTaskMenu::tr("No Vertical Alignment"), 0, menu, m_verticalGroup);
+    m_actions[Top] = createAction(QDesignerTaskMenu::tr("Top"), Qt::AlignTop, menu, m_verticalGroup);
+    m_actions[VerticalCenter] = createAction(QDesignerTaskMenu::tr("Center Vertically"), Qt::AlignVCenter, menu, m_verticalGroup);
+    m_actions[Bottom] = createAction(QDesignerTaskMenu::tr("Bottom"), Qt::AlignBottom, menu, m_verticalGroup);
+}
+
+void LayoutAlignmentMenu::connect(QObject *receiver, const char *aSlot)
+{
+    QObject::connect(m_horizGroup, SIGNAL(triggered(QAction*)), receiver, aSlot);
+    QObject::connect(m_verticalGroup, SIGNAL(triggered(QAction*)), receiver, aSlot);
+}
+
+bool LayoutAlignmentMenu::setAlignment(const QDesignerFormEditorInterface *core, QWidget *w)
+{
+    bool enabled;
+    const Qt::Alignment alignment = LayoutAlignmentCommand::alignmentOf(core, w, &enabled);
+    if (!enabled) {
+        m_subMenuAction->setEnabled(false);
+        m_actions[HorizNone]->setChecked(true);
+        m_actions[VerticalNone]->setChecked(true);
+        return false;
+    }
+    // Get alignment
+    switch (alignment & Qt::AlignHorizontal_Mask) {
+    case Qt::AlignLeft:
+        m_actions[Left]->setChecked(true);
+        break;
+    case Qt::AlignHCenter:
+        m_actions[HorizCenter]->setChecked(true);
+        break;
+    case Qt::AlignRight:
+        m_actions[Right]->setChecked(true);
+        break;
+    default:
+        m_actions[HorizNone]->setChecked(true);
+        break;
+    }
+    switch (alignment & Qt::AlignVertical_Mask) {
+    case Qt::AlignTop:
+        m_actions[Top]->setChecked(true);
+        break;
+    case Qt::AlignVCenter:
+        m_actions[VerticalCenter]->setChecked(true);
+        break;
+    case Qt::AlignBottom:
+        m_actions[Bottom]->setChecked(true);
+        break;
+    default:
+        m_actions[VerticalNone]->setChecked(true);
+        break;
+    }
+    return true;
+}
+
+Qt::Alignment LayoutAlignmentMenu::alignment() const
+{
+    Qt::Alignment alignment = 0;
+    if (const QAction *horizAction = m_horizGroup->checkedAction())
+        if (const int horizAlign = horizAction->data().toInt())
+            alignment |= static_cast<Qt::Alignment>(horizAlign);
+    if (const QAction *vertAction = m_verticalGroup->checkedAction())
+        if (const int vertAlign = vertAction->data().toInt())
+            alignment |= static_cast<Qt::Alignment>(vertAlign);
+    return alignment;
 }
 
-namespace qdesigner_internal {
 // -------------- QDesignerTaskMenuPrivate
 class QDesignerTaskMenuPrivate {
 public:
@@ -214,6 +333,7 @@ public:
     QAction *m_navigateToSlot;
     PromotionTaskMenu* m_promotionTaskMenu;
     QActionGroup *m_sizeActionGroup;
+    LayoutAlignmentMenu m_layoutAlignmentMenu;
     QAction *m_sizeActionsSubMenu;
 };
 
@@ -242,6 +362,7 @@ QDesignerTaskMenuPrivate::QDesignerTaskMenuPrivate(QWidget *widget, QObject *par
     m_navigateToSlot(new QAction(QDesignerTaskMenu::tr("Go to slot..."), parent)),
     m_promotionTaskMenu(new PromotionTaskMenu(widget, PromotionTaskMenu::ModeManagedMultiSelection, parent)),
     m_sizeActionGroup(new QActionGroup(parent)),
+    m_layoutAlignmentMenu(parent),
     m_sizeActionsSubMenu(new QAction(QDesignerTaskMenu::tr("Size Constraints"), parent))
 {
     QMenu *sizeMenu = new QMenu;
@@ -293,6 +414,7 @@ QDesignerTaskMenu::QDesignerTaskMenu(QWidget *widget, QObject *parent) :
     connect(d->m_containerFakeMethods, SIGNAL(triggered()), this, SLOT(containerFakeMethods()));
     connect(d->m_navigateToSlot, SIGNAL(triggered()), this, SLOT(slotNavigateToSlot()));
     connect(d->m_sizeActionGroup, SIGNAL(triggered(QAction*)), this,  SLOT(applySize(QAction*)));
+    d->m_layoutAlignmentMenu.connect(this, SLOT(slotLayoutAlignment()));
 }
 
 QDesignerTaskMenu::~QDesignerTaskMenu()
@@ -410,6 +532,9 @@ QList<QAction*> QDesignerTaskMenu::taskActions() const
     actions.append(d->m_changeStyleSheet);
     actions.append(d->m_separator6);
     actions.append(d->m_sizeActionsSubMenu);
+    if (d->m_layoutAlignmentMenu.setAlignment(formWindow->core(), d->m_widget))
+        actions.append(d->m_layoutAlignmentMenu.subMenuAction());
+
     d->m_promotionTaskMenu->setMode(formWindow->isManaged(d->m_widget) ?
                                     PromotionTaskMenu::ModeManagedMultiSelection : PromotionTaskMenu::ModeUnmanagedMultiSelection);
     d->m_promotionTaskMenu->addActions(formWindow, PromotionTaskMenu::LeadingSeparator, actions);
@@ -771,7 +896,17 @@ void QDesignerTaskMenu::setProperty(QDesignerFormWindowInterface *fw,  PropertyM
     }
 }
 
-
+void QDesignerTaskMenu::slotLayoutAlignment()
+{
+    QDesignerFormWindowInterface *fw = formWindow();
+    const Qt::Alignment newAlignment = d->m_layoutAlignmentMenu.alignment();
+    LayoutAlignmentCommand *cmd = new LayoutAlignmentCommand(fw);
+    if (cmd->init(d->m_widget, newAlignment)) {
+        fw->commandHistory()->push(cmd);
+    } else {
+        delete cmd;
+    }
+}
 } // namespace qdesigner_internal
 
 QT_END_NAMESPACE
diff --git a/tools/designer/src/lib/shared/qdesigner_taskmenu_p.h b/tools/designer/src/lib/shared/qdesigner_taskmenu_p.h
index da7f572..23586f7 100644
--- a/tools/designer/src/lib/shared/qdesigner_taskmenu_p.h
+++ b/tools/designer/src/lib/shared/qdesigner_taskmenu_p.h
@@ -118,6 +118,7 @@ private slots:
     void containerFakeMethods();
     void slotNavigateToSlot();
     void applySize(QAction *a);
+    void slotLayoutAlignment();
 
 private:
     QDesignerTaskMenuPrivate *d;
diff --git a/tools/designer/src/lib/shared/qlayout_widget.cpp b/tools/designer/src/lib/shared/qlayout_widget.cpp
index acec815..012f605 100644
--- a/tools/designer/src/lib/shared/qlayout_widget.cpp
+++ b/tools/designer/src/lib/shared/qlayout_widget.cpp
@@ -601,7 +601,7 @@ QRect LayoutHelper::itemInfo(QLayout *lt, const QWidget *widget) const
         }
     }
 
-    // Grid Layout state. Datatypically store the state of a GridLayout as a map of
+    // Grid Layout state. Datatype storing the state of a GridLayout as a map of
     // widgets to QRect(columns, rows) and size. Used to store the state for undo operations
     // that do not change the widgets within the layout; also provides some manipulation
     // functions and ability to apply the state to a layout provided its widgets haven't changed.
@@ -634,7 +634,11 @@ QRect LayoutHelper::itemInfo(QLayout *lt, const QWidget *widget) const
         static CellStates cellStates(const QList<QRect> &rects, int numRows, int numColumns);
 
         typedef QMap<QWidget *, QRect> WidgetItemMap;
+        typedef QMap<QWidget *, Qt::Alignment> WidgetAlignmentMap;
+
         WidgetItemMap widgetItemMap;
+        WidgetAlignmentMap widgetAlignmentMap;
+
         int rowCount;
         int colCount;
     };
@@ -706,8 +710,11 @@ QRect LayoutHelper::itemInfo(QLayout *lt, const QWidget *widget) const
         const int count = l->count();
         for (int i = 0; i < count; i++) {
             QLayoutItem *item = l->itemAt(i);
-            if (!LayoutInfo::isEmptyItem(item))
+            if (!LayoutInfo::isEmptyItem(item)) {
                 widgetItemMap.insert(item->widget(), gridItemInfo(l, i));
+                if (item->alignment())
+                    widgetAlignmentMap.insert(item->widget(), item->alignment());
+            }
         }
     }
 
@@ -743,7 +750,8 @@ QRect LayoutHelper::itemInfo(QLayout *lt, const QWidget *widget) const
         const LayoutItemRectMap::const_iterator icend = itemMap.constEnd();
         for (LayoutItemRectMap::const_iterator it = itemMap.constBegin(); it != icend; ++it) {
             const QRect info = it.value();
-            grid->addItem(it.key(), info.y(), info.x(), info.height(), info.width());
+            const Qt::Alignment alignment = widgetAlignmentMap.value(it.key()->widget(), Qt::Alignment(0));
+            grid->addItem(it.key(), info.y(), info.x(), info.height(), info.width(), alignment);
         }
         // create spacers
         const CellStates cs = cellStates(itemMap.values(), rowCount, colCount);
diff --git a/tools/designer/src/lib/uilib/abstractformbuilder.cpp b/tools/designer/src/lib/uilib/abstractformbuilder.cpp
index 3f40d81..ae6fac9 100644
--- a/tools/designer/src/lib/uilib/abstractformbuilder.cpp
+++ b/tools/designer/src/lib/uilib/abstractformbuilder.cpp
@@ -794,6 +794,69 @@ static inline QFormLayout::ItemRole formLayoutRole(int column, int colspan)
 }
 #endif
 
+static inline QString alignmentValue(Qt::Alignment a)
+{
+    QString h,v;
+    switch (a & Qt::AlignHorizontal_Mask) {
+    case Qt::AlignLeft:
+        h = QLatin1String("Qt::AlignLeft");
+        break;
+    case Qt::AlignRight:
+        h = QLatin1String("Qt::AlignRight");
+        break;
+    case Qt::AlignHCenter:
+        h = QLatin1String("Qt::AlignHCenter");
+        break;
+    case Qt::AlignJustify:
+        h = QLatin1String("Qt::AlignJustify");
+        break;
+    }
+    switch (a & Qt::AlignVertical_Mask) {
+    case Qt::AlignTop:
+        v = QLatin1String("Qt::AlignTop");
+        break;
+    case Qt::AlignBottom:
+        v = QLatin1String("Qt::AlignBottom");
+        break;
+    case Qt::AlignVCenter:
+        v = QLatin1String("Qt::AlignVCenter");
+        break;
+    }
+    if (h.isEmpty() && v.isEmpty())
+        return QString();
+    if (!v.isEmpty()) {
+        if (!h.isEmpty())
+            h += QLatin1Char('|');
+        h += v;
+    }
+    return h;
+}
+
+static inline Qt::Alignment alignmentFromDom(const QString &in)
+{
+    Qt::Alignment rc = 0;
+    if (!in.isEmpty()) {
+        foreach (const QString &f, in.split(QLatin1Char('|'))) {
+            if (f == QLatin1String("Qt::AlignLeft")) {
+                rc |= Qt::AlignLeft;
+            } else if (f == QLatin1String("Qt::AlignRight")) {
+                rc |= Qt::AlignRight;
+            } else if (f == QLatin1String("Qt::AlignHCenter")) {
+                rc |= Qt::AlignHCenter;
+            } else if (f == QLatin1String("Qt::AlignJustify")) {
+                rc |= Qt::AlignJustify;
+            } else if (f == QLatin1String("Qt::AlignTop")) {
+                rc |= Qt::AlignTop;
+            } else if (f == QLatin1String("Qt::AlignBottom")) {
+                rc |= Qt::AlignBottom;
+            } else if (f == QLatin1String("Qt::AlignVCenter")) {
+                rc |= Qt::AlignVCenter;
+            }
+        }
+    }
+    return rc;
+}
+
 /*!
     \internal
 */
@@ -838,12 +901,15 @@ QLayoutItem *QAbstractFormBuilder::create(DomLayoutItem *ui_layoutItem, QLayout
 {
     switch (ui_layoutItem->kind()) {
     case DomLayoutItem::Widget: {
-        if (QWidget *w = create(ui_layoutItem->elementWidget(), parentWidget))
+        if (QWidget *w = create(ui_layoutItem->elementWidget(), parentWidget)) {
 #ifdef QFORMINTERNAL_NAMESPACE // uilib
-            return new QWidgetItemV2(w);
+            QWidgetItem *item = new QWidgetItemV2(w);
 #else                         // Within Designer: Use factory method that returns special items that refuse to shrink to 0,0
-            return QLayoutPrivate::createWidgetItem(layout, w);
+            QWidgetItem *item = QLayoutPrivate::createWidgetItem(layout, w);
 #endif
+            item->setAlignment(alignmentFromDom(ui_layoutItem->attributeAlignment()));
+            return item;
+        }
         qWarning() << QCoreApplication::translate("QAbstractFormBuilder", "Empty widget item in %1 '%2'.").arg(QString::fromUtf8(layout->metaObject()->className()), layout->objectName());
         return 0;
     }
@@ -1384,13 +1450,14 @@ DomActionRef *QAbstractFormBuilder::createActionRefDom(QAction *action)
 // Struct to store layout item parameters for saving layout items
 struct FormBuilderSaveLayoutEntry {
     explicit FormBuilderSaveLayoutEntry(QLayoutItem *li = 0) :
-        item(li), row(-1), column(-1), rowSpan(0), columnSpan(0) {}
+        item(li), row(-1), column(-1), rowSpan(0), columnSpan(0), alignment(0) {}
 
     QLayoutItem *item;
     int row;
     int column;
     int rowSpan;
     int columnSpan;
+    Qt::Alignment alignment;
 };
 
 // Create list from standard box layout
@@ -1401,7 +1468,9 @@ static QList<FormBuilderSaveLayoutEntry> saveLayoutEntries(const QLayout *layout
         rc.reserve(count);
         for (int idx = 0; idx < count; ++idx) {
             QLayoutItem *item = layout->itemAt(idx);
-            rc.append(FormBuilderSaveLayoutEntry(item));
+            FormBuilderSaveLayoutEntry entry(item);
+            entry.alignment = item->alignment();
+            rc.append(entry);
         }
     }
     return rc;
@@ -1417,6 +1486,7 @@ static QList<FormBuilderSaveLayoutEntry> saveGridLayoutEntries(QGridLayout *grid
             QLayoutItem *item = gridLayout->itemAt(idx);
             FormBuilderSaveLayoutEntry entry(item);
             gridLayout->getItemPosition(idx, &entry.row, &entry.column, &entry.rowSpan,&entry.columnSpan);
+            entry.alignment = item->alignment();
             rc.append(entry);
         }
     }
@@ -1490,6 +1560,8 @@ DomLayout *QAbstractFormBuilder::createDom(QLayout *layout, DomLayout *ui_layout
                 ui_item->setAttributeRowSpan(item.rowSpan);
             if (item.columnSpan > 1)
                 ui_item->setAttributeColSpan(item.columnSpan);
+            if (item.alignment)
+                ui_item->setAttributeAlignment(alignmentValue(item.alignment));
             ui_items.append(ui_item);
         }
     }
diff --git a/tools/designer/src/lib/uilib/ui4.cpp b/tools/designer/src/lib/uilib/ui4.cpp
index 98974e6..2b5fe8b 100644
--- a/tools/designer/src/lib/uilib/ui4.cpp
+++ b/tools/designer/src/lib/uilib/ui4.cpp
@@ -3673,6 +3673,7 @@ void DomLayoutItem::clear(bool clear_all)
     m_attr_rowSpan = 0;
     m_has_attr_colSpan = false;
     m_attr_colSpan = 0;
+    m_has_attr_alignment = false;
     }
 
     m_kind = Unknown;
@@ -3694,6 +3695,7 @@ DomLayoutItem::DomLayoutItem()
     m_attr_rowSpan = 0;
     m_has_attr_colSpan = false;
     m_attr_colSpan = 0;
+    m_has_attr_alignment = false;
     m_widget = 0;
     m_layout = 0;
     m_spacer = 0;
@@ -3727,6 +3729,10 @@ void DomLayoutItem::read(QXmlStreamReader &reader)
             setAttributeColSpan(attribute.value().toString().toInt());
             continue;
         }
+        if (name == QLatin1String("alignment")) {
+            setAttributeAlignment(attribute.value().toString());
+            continue;
+        }
         reader.raiseError(QLatin1String("Unexpected attribute ") + name.toString());
     }
 
@@ -3779,6 +3785,8 @@ void DomLayoutItem::read(const QDomElement &node)
         setAttributeRowSpan(node.attribute(QLatin1String("rowspan")).toInt());
     if (node.hasAttribute(QLatin1String("colspan")))
         setAttributeColSpan(node.attribute(QLatin1String("colspan")).toInt());
+    if (node.hasAttribute(QLatin1String("alignment")))
+        setAttributeAlignment(node.attribute(QLatin1String("alignment")));
 
     for (QDomNode n = node.firstChild(); !n.isNull(); n = n.nextSibling()) {
         if (!n.isElement())
@@ -3828,6 +3836,9 @@ void DomLayoutItem::write(QXmlStreamWriter &writer, const QString &tagName) cons
     if (hasAttributeColSpan())
         writer.writeAttribute(QLatin1String("colspan"), QString::number(attributeColSpan()));
 
+    if (hasAttributeAlignment())
+        writer.writeAttribute(QLatin1String("alignment"), attributeAlignment());
+
     switch (kind()) {
         case Widget: {
             DomWidget* v = elementWidget();
diff --git a/tools/designer/src/lib/uilib/ui4_p.h b/tools/designer/src/lib/uilib/ui4_p.h
index a464a89..836175e 100644
--- a/tools/designer/src/lib/uilib/ui4_p.h
+++ b/tools/designer/src/lib/uilib/ui4_p.h
@@ -1427,6 +1427,11 @@ public:
     inline void setAttributeColSpan(int a) { m_attr_colSpan = a; m_has_attr_colSpan = true; }
     inline void clearAttributeColSpan() { m_has_attr_colSpan = false; }
 
+    inline bool hasAttributeAlignment() const { return m_has_attr_alignment; }
+    inline QString attributeAlignment() const { return m_attr_alignment; }
+    inline void setAttributeAlignment(const QString& a) { m_attr_alignment = a; m_has_attr_alignment = true; }
+    inline void clearAttributeAlignment() { m_has_attr_alignment = false; }
+
     // child element accessors
     enum Kind { Unknown = 0, Widget, Layout, Spacer };
     inline Kind kind() const { return m_kind; }
@@ -1460,6 +1465,9 @@ private:
     int m_attr_colSpan;
     bool m_has_attr_colSpan;
 
+    QString m_attr_alignment;
+    bool m_has_attr_alignment;
+
     // child element data
     Kind m_kind;
     DomWidget* m_widget;