qstackedwidget.cpp

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#include "qstackedwidget.h"

#ifndef QT_NO_STACKEDWIDGET

#include <qstackedlayout.h>
#include <qevent.h>
#include <private/qframe_p.h>

QT_BEGIN_NAMESPACE

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)) {
            if (QWidget *w = item->widget())
                hfw = qMax(hfw, w->heightForWidth(width));
        }
    }

    hfw = qMax(hfw, minimumSize().height());
    return hfw;
}


class QStackedWidgetPrivate : public QFramePrivate
{
    Q_DECLARE_PUBLIC(QStackedWidget)
public:
    QStackedWidgetPrivate():layout(0){}
    QStackedLayoutHFW *layout;
    bool blockChildAdd;
};

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)));
}

QStackedWidget::~QStackedWidget()
{
}

int QStackedWidget::addWidget(QWidget *widget)
{
    return d_func()->layout->addWidget(widget);
}

int QStackedWidget::insertWidget(int index, QWidget *widget)
{
    return d_func()->layout->insertWidget(index, widget);
}

void QStackedWidget::removeWidget(QWidget *widget)
{
    d_func()->layout->removeWidget(widget);
}

void QStackedWidget::setCurrentIndex(int index)
{
    d_func()->layout->setCurrentIndex(index);
}

int QStackedWidget::currentIndex() const
{
    return d_func()->layout->currentIndex();
}

QWidget *QStackedWidget::currentWidget() const
{
    return d_func()->layout->currentWidget();
}


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);
}

int QStackedWidget::indexOf(QWidget *widget) const
{
    return d_func()->layout->indexOf(widget);
}

QWidget *QStackedWidget::widget(int index) const
{
    return d_func()->layout->widget(index);
}

int QStackedWidget::count() const
{
    return d_func()->layout->count();
}

bool QStackedWidget::event(QEvent *e)
{
    return QFrame::event(e);
}

QT_END_NAMESPACE

#endif // QT_NO_STACKEDWIDGET