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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 338 insertions, 0 deletions

diff --git a/src/gui/widgets/qstackedwidget.cpp b/src/gui/widgets/qstackedwidget.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qstackedwidget.h"
+
+#ifndef QT_NO_STACKEDWIDGET
+
+#include <qstackedlayout.h>
+#include <qevent.h>
+#include <private/qframe_p.h>
+
+QT_BEGIN_NAMESPACE
+
+/**
+   QStackedLayout does not support height for width (simply because it does not reimplement
+   heightForWidth() and hasHeightForWidth()). That is not possible to fix without breaking
+   binary compatibility. (QLayout is subject to multiple inheritance).
+   However, we can fix QStackedWidget by simply using a modified version of QStackedLayout
+   that reimplements the hfw-related functions:
+ */
+class QStackedLayoutHFW : public QStackedLayout 
+{ 
+public: 
+    QStackedLayoutHFW(QWidget *parent = 0) : QStackedLayout(parent) {} 
+    bool hasHeightForWidth() const; 
+    int heightForWidth(int width) const; 
+}; 
+ 
+bool QStackedLayoutHFW::hasHeightForWidth() const 
+{ 
+    const int n = count(); 
+ 
+    for (int i = 0; i < n; ++i) { 
+        if (QLayoutItem *item = itemAt(i)) { 
+            if (item->hasHeightForWidth()) 
+                return true; 
+        } 
+    } 
+    return false; 
+} 
+ 
+int QStackedLayoutHFW::heightForWidth(int width) const 
+{ 
+    const int n = count(); 
+ 
+    int hfw = 0; 
+    for (int i = 0; i < n; ++i) { 
+        if (QLayoutItem *item = itemAt(i)) { 
+            hfw = qMax(hfw, item->heightForWidth(width)); 
+        } 
+    } 
+    return hfw; 
+} 
+ 
+
+class QStackedWidgetPrivate : public QFramePrivate
+{
+    Q_DECLARE_PUBLIC(QStackedWidget)
+public:
+    QStackedWidgetPrivate():layout(0){}
+    QStackedLayoutHFW *layout;
+    bool blockChildAdd;
+};
+
+/*!
+    \class QStackedWidget
+    \brief The QStackedWidget class provides a stack of widgets where
+    only one widget is visible at a time.
+
+    \ingroup organizers
+    \ingroup geomanagement
+
+
+    QStackedWidget can be used to create a user interface similar to
+    the one provided by QTabWidget. It is a convenience layout widget
+    built on top of the QStackedLayout class.
+
+    Like QStackedLayout, QStackedWidget can be constructed and
+    populated with a number of child widgets ("pages"):
+
+    \snippet doc/src/snippets/qstackedwidget/main.cpp 0
+    \snippet doc/src/snippets/qstackedwidget/main.cpp 2
+    \snippet doc/src/snippets/qstackedwidget/main.cpp 3
+
+    QStackedWidget provides no intrinsic means for the user to switch
+    page. This is typically done through a QComboBox or a QListWidget
+    that stores the titles of the QStackedWidget's pages. For
+    example:
+
+    \snippet doc/src/snippets/qstackedwidget/main.cpp 1
+
+    When populating a stacked widget, the widgets are added to an
+    internal list. The indexOf() function returns the index of a
+    widget in that list. The widgets can either be added to the end of
+    the list using the addWidget() function, or inserted at a given
+    index using the insertWidget() function. The removeWidget()
+    function removes a widget from the stacked widget. The number of
+    widgets contained in the stacked widget, can
+    be obtained using the count() function.
+
+    The widget() function returns the widget at a given index
+    position. The index of the widget that is shown on screen is given
+    by currentIndex() and can be changed using setCurrentIndex(). In a
+    similar manner, the currently shown widget can be retrieved using
+    the currentWidget() function, and altered using the
+    setCurrentWidget() function.
+
+    Whenever the current widget in the stacked widget changes or a
+    widget is removed from the stacked widget, the currentChanged()
+    and widgetRemoved() signals are emitted respectively.
+
+    \sa QStackedLayout, QTabWidget, {Config Dialog Example}
+*/
+
+/*!
+    \fn void QStackedWidget::currentChanged(int index)
+
+    This signal is emitted whenever the current widget changes.
+
+    The parameter holds the \a index of the new current widget, or -1
+    if there isn't a new one (for example, if there are no widgets in
+    the QStackedWidget).
+
+    \sa currentWidget(), setCurrentWidget()
+*/
+
+/*!
+    \fn void QStackedWidget::widgetRemoved(int index)
+
+    This signal is emitted whenever a widget is removed. The widget's
+    \a index is passed as parameter.
+
+    \sa removeWidget()
+*/
+
+/*!
+    Constructs a QStackedWidget with the given \a parent.
+
+    \sa addWidget(), insertWidget()
+*/
+QStackedWidget::QStackedWidget(QWidget *parent)
+    : QFrame(*new QStackedWidgetPrivate, parent)
+{
+    Q_D(QStackedWidget);
+    d->layout = new QStackedLayoutHFW(this);
+    connect(d->layout, SIGNAL(widgetRemoved(int)), this, SIGNAL(widgetRemoved(int)));
+    connect(d->layout, SIGNAL(currentChanged(int)), this, SIGNAL(currentChanged(int)));
+}
+
+/*!
+    Destroys this stacked widget, and frees any allocated resources.
+*/
+QStackedWidget::~QStackedWidget()
+{
+}
+
+/*!
+    Appends the given \a widget to the QStackedWidget and returns the
+    index position. Ownership of \a widget is passed on to the
+    QStackedWidget.
+
+    If the QStackedWidget is empty before this function is called,
+    \a widget becomes the current widget.
+
+    \sa insertWidget(), removeWidget(), setCurrentWidget()
+*/
+int QStackedWidget::addWidget(QWidget *widget)
+{
+    return d_func()->layout->addWidget(widget);
+}
+
+/*!
+    Inserts the given \a widget at the given \a index in the
+    QStackedWidget. Ownership of \a widget is passed on to the
+    QStackedWidget. If \a index is out of range, the \a widget is
+    appended (in which case it is the actual index of the \a widget
+    that is returned).
+
+    If the QStackedWidget was empty before this function is called,
+    the given \a widget becomes the current widget.
+
+    Inserting a new widget at an index less than or equal to the current index
+    will increment the current index, but keep the current widget.
+
+    \sa addWidget(), removeWidget(), setCurrentWidget()
+*/
+int QStackedWidget::insertWidget(int index, QWidget *widget)
+{
+    return d_func()->layout->insertWidget(index, widget);
+}
+
+/*!
+    Removes \a widget from the QStackedWidget. i.e., \a widget is \e
+    not deleted but simply removed from the stacked layout, causing it
+    to be hidden.
+
+    \bold{Note:} Ownership of \a widget reverts to the application.
+
+    \sa addWidget(), insertWidget(), currentWidget()
+*/
+void QStackedWidget::removeWidget(QWidget *widget)
+{
+    d_func()->layout->removeWidget(widget);
+}
+
+/*!
+    \property QStackedWidget::currentIndex
+    \brief the index position of the widget that is visible
+
+    The current index is -1 if there is no current widget.
+
+    By default, this property contains a value of -1 because the stack
+    is initially empty.
+
+    \sa currentWidget(), indexOf()
+*/
+
+void QStackedWidget::setCurrentIndex(int index)
+{
+    d_func()->layout->setCurrentIndex(index);
+}
+
+int QStackedWidget::currentIndex() const
+{
+    return d_func()->layout->currentIndex();
+}
+
+/*!
+    Returns the current widget, or 0 if there are no child widgets.
+
+    \sa currentIndex(), setCurrentWidget()
+*/
+QWidget *QStackedWidget::currentWidget() const
+{
+    return d_func()->layout->currentWidget();
+}
+
+
+/*!
+    \fn void QStackedWidget::setCurrentWidget(QWidget *widget)
+
+    Sets the current widget to be the specified \a widget. The new
+    current widget must already be contained in this stacked widget.
+
+    \sa currentWidget(), setCurrentIndex()
+ */
+void QStackedWidget::setCurrentWidget(QWidget *widget)
+{
+    Q_D(QStackedWidget);
+    if (d->layout->indexOf(widget) == -1) {
+        qWarning("QStackedWidget::setCurrentWidget: widget %p not contained in stack", widget);
+        return;
+    }
+    d->layout->setCurrentWidget(widget);
+}
+
+/*!
+    Returns the index of the given \a widget, or -1 if the given \a
+    widget is not a child of the QStackedWidget.
+
+    \sa currentIndex(), widget()
+*/
+int QStackedWidget::indexOf(QWidget *widget) const
+{
+    return d_func()->layout->indexOf(widget);
+}
+
+/*!
+    Returns the widget at the given \a index, or 0 if there is no such
+    widget.
+
+    \sa currentWidget(), indexOf()
+*/
+QWidget *QStackedWidget::widget(int index) const
+{
+    return d_func()->layout->widget(index);
+}
+
+/*!
+    \property QStackedWidget::count
+    \brief the number of widgets contained by this stacked widget
+
+    By default, this property contains a value of 0.
+
+    \sa currentIndex(), widget()
+*/
+int QStackedWidget::count() const
+{
+    return d_func()->layout->count();
+}
+
+/*! \reimp */
+bool QStackedWidget::event(QEvent *e)
+{
+    return QFrame::event(e);
+}
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_STACKEDWIDGET