qtoolbox.cpp

奇趣公司比较新的qt/emd版本

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#include "qtoolbox.h"

#ifndef QT_NO_TOOLBOX

#include <qapplication.h>
#include <qeventloop.h>
#include <qlayout.h>
#include <qlist.h>
#include <qpainter.h>
#include <qscrollarea.h>
#include <qstyle.h>
#include <qstyleoption.h>
#include <qtooltip.h>
#include <qabstractbutton.h>

#include "qframe_p.h"

class QToolBoxButton : public QAbstractButton
{
    Q_OBJECT
public:
    QToolBoxButton(QWidget *parent)
        : QAbstractButton(parent), selected(false), indexInPage(-1)
    {
        setBackgroundRole(QPalette::Window);
        setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
        setFocusPolicy(Qt::NoFocus);
    }

    inline void setSelected(bool b) { selected = b; update(); }
    inline void setIndex(int newIndex) { indexInPage = newIndex; }

    QSize sizeHint() const;
    QSize minimumSizeHint() const;

protected:
    void initStyleOption(QStyleOptionToolBox *opt) const;
    void paintEvent(QPaintEvent *);

private:
    bool selected;
    int indexInPage;
};

#include "qtoolbox.moc"


class QToolBoxPrivate : public QFramePrivate
{
    Q_DECLARE_PUBLIC(QToolBox)
public:
    struct Page
    {
        QToolBoxButton *button;
        QScrollArea *sv;
        QWidget *widget;

        inline void setText(const QString &text) { button->setText(text); }
        inline void setIcon(const QIcon &is) { button->setIcon(is); }
#ifndef QT_NO_TOOLTIP
        inline void setToolTip(const QString &tip) { button->setToolTip(tip); }
        inline QString toolTip() const { return button->toolTip(); }
#endif
        inline QString text() const { return button->text(); }
        inline QIcon icon() const { return button->icon(); }

        inline bool operator==(const Page& other) const
        {
            return widget == other.widget;
        }
    };
    typedef QList<Page> PageList;

    inline QToolBoxPrivate()
        : currentPage(0)
    {
    }
    void _q_buttonClicked();
    void _q_widgetDestroyed(QObject*);

    Page *page(QWidget *widget) const;
    const Page *page(int index) const;
    Page *page(int index);

    void updateTabs();
    void relayout();

    PageList pageList;
    QVBoxLayout *layout;
    Page *currentPage;
};

QToolBoxPrivate::Page *QToolBoxPrivate::page(QWidget *widget) const
{
    if (!widget)
        return 0;

    for (PageList::ConstIterator i = pageList.constBegin(); i != pageList.constEnd(); ++i)
        if ((*i).widget == widget)
            return (Page*) &(*i);
    return 0;
}

QToolBoxPrivate::Page *QToolBoxPrivate::page(int index)
{
    if (index >= 0 && index < pageList.size())
        return &pageList[index];
    return 0;
}

const QToolBoxPrivate::Page *QToolBoxPrivate::page(int index) const
{
    if (index >= 0 && index < pageList.size())
        return &pageList.at(index);
    return 0;
}

void QToolBoxPrivate::updateTabs()
{
    QToolBoxButton *lastButton = currentPage ? currentPage->button : 0;
    bool after = false;
    int index = 0;
    for (index = 0; index < pageList.count(); ++index) {
        const Page &page = pageList.at(index);
        QToolBoxButton *tB = page.button;
        // update indexes, since the updates are delayed, the indexes will be correct
        // when we actually paint.
        tB->setIndex(index);
        QWidget *tW = page.widget;
        if (after) {
            QPalette p = tB->palette();
            p.setColor(tB->backgroundRole(), tW->palette().color(tW->backgroundRole()));
            tB->setPalette(p);
            tB->update();
        } else if (tB->backgroundRole() != QPalette::Window) {
            tB->setBackgroundRole(QPalette::Window);
            tB->update();
        }
        after = tB == lastButton;
    }
}

QSize QToolBoxButton::sizeHint() const
{
    QSize iconSize(8, 8);
    if (!icon().isNull()) {
        int icone = style()->pixelMetric(QStyle::PM_SmallIconSize);
        iconSize += QSize(icone + 2, icone);
    }
    QSize textSize = fontMetrics().size(Qt::TextShowMnemonic, text()) + QSize(0, 8);

    QSize total(iconSize.width() + textSize.width(), qMax(iconSize.height(), textSize.height()));
    return total.expandedTo(QApplication::globalStrut());
}

QSize QToolBoxButton::minimumSizeHint() const
{
    if (icon().isNull())
        return QSize();
    int icone = style()->pixelMetric(QStyle::PM_SmallIconSize);
    return QSize(icone + 8, icone + 8);
}

void QToolBoxButton::initStyleOption(QStyleOptionToolBox *option) const
{
    if (!option)
        return;
    option->initFrom(this);
    if (selected)
        option->state |= QStyle::State_Selected;
    if (isDown())
        option->state |= QStyle::State_Sunken;
    option->text = text();
    option->icon = icon();

    if (QStyleOptionToolBoxV2 *optionV2 = qstyleoption_cast<QStyleOptionToolBoxV2 *>(option)) {
        QToolBox *toolBox = static_cast<QToolBox *>(parentWidget()); // I know I'm in a tool box.
        int widgetCount = toolBox->count();
        int currIndex = toolBox->currentIndex();
        if (widgetCount == 1) {
            optionV2->position = QStyleOptionToolBoxV2::OnlyOneTab;
        } else if (indexInPage == 0) {
            optionV2->position = QStyleOptionToolBoxV2::Beginning;
        } else if (indexInPage == widgetCount - 1) {
            optionV2->position = QStyleOptionToolBoxV2::End;
        } else {
            optionV2->position = QStyleOptionToolBoxV2::Middle;
        }
        if (currIndex == indexInPage - 1) {
            optionV2->selectedPosition = QStyleOptionToolBoxV2::PreviousIsSelected;
        } else if (currIndex == indexInPage + 1) {
            optionV2->selectedPosition = QStyleOptionToolBoxV2::NextIsSelected;
        } else {
            optionV2->selectedPosition = QStyleOptionToolBoxV2::NotAdjacent;
        }
    }
}

void QToolBoxButton::paintEvent(QPaintEvent *)
{
    QPainter paint(this);
    QString text = QAbstractButton::text();
    QPainter *p = &paint;
    QStyleOptionToolBoxV2 opt;
    initStyleOption(&opt);
    style()->drawControl(QStyle::CE_ToolBoxTab, &opt, p, parentWidget());
}

/*!
    \class QToolBox

    \brief The QToolBox class provides a column of tabbed widget items.

    \mainclass
    \ingroup advanced

    A toolbox is a widget that displays a column of tabs one above the
    other, with the current item displayed below the current tab.
    Every tab has an index position within the column of tabs. A tab's
    item is a QWidget.

    Each item has an itemText(), an optional itemIcon(), an optional
    itemToolTip(), and a widget(). The item's attributes can be
    changed with setItemText(), setItemIcon(), and
    setItemToolTip(). Each item can be enabled or disabled
    individually with setItemEnabled().

    Items are added using addItem(), or inserted at particular
    positions using insertItem(). The total number of items is given
    by count(). Items can be deleted with delete, or removed from the
    toolbox with removeItem(). Combining removeItem() and insertItem()
    allows you to move items to different positions.

    The index of the current item widget is returned by currentIndex(),
    and set with setCurrentIndex(). The index of a particular item can
    be found using indexOf(), and the item at a given index is returned
    by item().

    The currentChanged() signal is emitted when the current item is
    changed.

    \sa QTabWidget
*/

/*!
    \fn void QToolBox::currentChanged(int index)

    This signal is emitted when the current item is changed. The new
    current item's index is passed in \a index, or -1 if there is no
    current item.
*/

#ifdef QT3_SUPPORT
/*!
    Constructs a toolbox called \a name with parent \a parent and flags \a f.
*/
QToolBox::QToolBox(QWidget *parent, const char *name, Qt::WindowFlags f)
    :  QFrame(*new QToolBoxPrivate, parent, f)
{
    Q_D(QToolBox);
    setObjectName(QString::fromAscii(name));
    d->layout = new QVBoxLayout(this);
    d->layout->setMargin(0);
    setBackgroundRole(QPalette::Button);
}
#endif

/*!
    Constructs a new toolbox with the given \a parent and the flags, \a f.
*/
QToolBox::QToolBox(QWidget *parent, Qt::WindowFlags f)
    :  QFrame(*new QToolBoxPrivate, parent, f)
{
    Q_D(QToolBox);
    d->layout = new QVBoxLayout(this);
    d->layout->setMargin(0);
    setBackgroundRole(QPalette::Button);
}

/*!
    Destroys the toolbox.
*/

QToolBox::~QToolBox()
{
}

/*!
    \fn int QToolBox::addItem(QWidget *w, const QString &text)
    \overload

    Adds the widget \a w in a new tab at bottom of the toolbox. The
    new tab's text is set to \a text. Returns the new tab's index.
*/

/*!
    \fn int QToolBox::addItem(QWidget *widget, const QIcon &iconSet,const QString &text)
    Adds the \a widget in a new tab at bottom of the toolbox. The
    new tab's text is set to \a text, and the \a iconSet is
    displayed to the left of the \a text.  Returns the new tab's index.
*/

/*!
    \fn int QToolBox::insertItem(int index, QWidget *widget, const QString &text)
    \overload

    Inserts the \a widget at position \a index, or at the bottom
    of the toolbox if \a index is out of range. The new item's text is
    set to \a text. Returns the new item's index.
*/

/*!
    Inserts the \a widget at position \a index, or at the bottom
    of the toolbox if \a index is out of range. The new item's text
    is set to \a text, and the \a icon is displayed to the left of
    the \a text. Returns the new item's index.
*/

int QToolBox::insertItem(int index, QWidget *widget, const QIcon &icon, const QString &text)
{
    if (!widget)
        return -1;

    Q_D(QToolBox);
    connect(widget, SIGNAL(destroyed(QObject*)), this, SLOT(_q_widgetDestroyed(QObject*)));

    QToolBoxPrivate::Page c;
    c.widget = widget;
    c.button = new QToolBoxButton(this);
    connect(c.button, SIGNAL(clicked()), this, SLOT(_q_buttonClicked()));

    c.sv = new QScrollArea(this);
    c.sv->setWidget(widget);
    c.sv->setWidgetResizable(true);
    c.sv->hide();
    c.sv->setFrameStyle(QFrame::NoFrame);

    c.setText(text);
    c.setIcon(icon);

    if (index < 0 || index >= (int)d->pageList.count()) {
        index = d->pageList.count();
        d->pageList.append(c);
        d->layout->addWidget(c.button);
        d->layout->addWidget(c.sv);
        if (index == 0)
            setCurrentIndex(index);
    } else {
        d->pageList.insert(index, c);
        d->relayout();
        if (d->currentPage) {
            QWidget *current = d->currentPage->widget;
            int oldindex = indexOf(current);
            if (index <= oldindex) {
                d->currentPage = 0; // trigger change
                setCurrentIndex(oldindex);
            }
        }
    }

    c.button->show();

    d->updateTabs();
    itemInserted(index);
    return index;
}

void QToolBoxPrivate::_q_buttonClicked()
{