qdockarealayout.cpp

奇趣公司比较新的qt/emd版本

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#include "QtGui/qwidget.h"
#include "QtGui/qtabbar.h"
#include "QtGui/qstyle.h"
#include "QtCore/qvariant.h"
#include "qdockarealayout_p.h"
#include "qdockwidget.h"
#include "qmainwindow.h"
#include "qwidgetanimator_p.h"
#include "qmainwindowlayout_p.h"
#include "qdockwidget_p.h"
#include <private/qlayoutengine_p.h>
#include <qdebug.h>

#include <qpainter.h>
#include <qstyleoption.h>

#ifndef QT_NO_DOCKWIDGET

enum { StateFlagVisible = 1, StateFlagFloating = 2 };

/******************************************************************************
** QDockAreaLayoutItem
*/

QDockAreaLayoutItem::QDockAreaLayoutItem(QLayoutItem *_widgetItem)
    : widgetItem(_widgetItem), subinfo(0), pos(0), size(-1), gap(false),
        keep_size(false)
{
}

QDockAreaLayoutItem::QDockAreaLayoutItem(QDockAreaLayoutInfo *_subinfo)
    : widgetItem(0), subinfo(_subinfo), pos(0), size(-1), gap(false),
        keep_size(false)
{
}

QDockAreaLayoutItem::QDockAreaLayoutItem(const QDockAreaLayoutItem &other)
    : widgetItem(other.widgetItem), subinfo(0), pos(other.pos),
        size(other.size), gap(other.gap), keep_size(other.keep_size)
{
    if (other.subinfo != 0)
        subinfo = new QDockAreaLayoutInfo(*other.subinfo);
    Q_ASSERT(widgetItem == 0 || subinfo == 0);
}

QDockAreaLayoutItem::~QDockAreaLayoutItem()
{
    delete subinfo;
}

bool QDockAreaLayoutItem::skip() const
{
    if (gap)
        return false;

    if (widgetItem != 0)
        return widgetItem->isEmpty();

    if (subinfo != 0) {
        for (int i = 0; i < subinfo->item_list.count(); ++i) {
            if (!subinfo->item_list.at(i).skip())
                return false;
        }
    }

    return true;
}

QSize QDockAreaLayoutItem::minimumSize() const
{
    if (widgetItem != 0)
        return widgetItem->minimumSize();
    if (subinfo != 0)
        return subinfo->minimumSize();
    return QSize(0, 0);
}

QSize QDockAreaLayoutItem::maximumSize() const
{
    if (widgetItem != 0)
        return widgetItem->maximumSize();
    if (subinfo != 0)
        return subinfo->maximumSize();
    return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);
}

bool QDockAreaLayoutItem::expansive(Qt::Orientation o) const
{
    if (gap)
        return false;
    if (widgetItem != 0)
        return ((widgetItem->expandingDirections() & o) == o);
    if (subinfo != 0)
        return subinfo->expansive(o);
    return false;
}

QSize QDockAreaLayoutItem::sizeHint() const
{
    if (widgetItem != 0)
        return widgetItem->sizeHint();
    if (subinfo != 0)
        return subinfo->sizeHint();
    return QSize(-1, -1);
}

QDockAreaLayoutItem
    &QDockAreaLayoutItem::operator = (const QDockAreaLayoutItem &other)
{
    widgetItem = other.widgetItem;
    if (other.subinfo == 0)
        subinfo = 0;
    else
        subinfo = new QDockAreaLayoutInfo(*other.subinfo);
    pos = other.pos;
    size = other.size;
    gap = other.gap;

    return *this;
}

/******************************************************************************
** QDockAreaLayoutInfo
*/

#ifndef QT_NO_TABBAR
static quintptr tabId(const QDockAreaLayoutItem &item)
{
    if (item.widgetItem == 0)
        return 0;
    return reinterpret_cast<quintptr>(item.widgetItem->widget());
}
#endif

QDockAreaLayoutInfo::QDockAreaLayoutInfo()
    : sep(0), dockPos(QInternal::LeftDock), o(Qt::Horizontal), rect(0, 0, -1, -1), mainWindow(0)
#ifndef QT_NO_TABBAR
    , tabbed(false), tabBar(0), tabBarShape(QTabBar::RoundedSouth)
#endif
{
}

QDockAreaLayoutInfo::QDockAreaLayoutInfo(int _sep, QInternal::DockPosition _dockPos,
                                            Qt::Orientation _o, int tbshape,
                                            QMainWindow *window)
    : sep(_sep), dockPos(_dockPos), o(_o), rect(0, 0, -1, -1), mainWindow(window)
#ifndef QT_NO_TABBAR
    , tabbed(false), tabBar(0), tabBarShape(static_cast<QTabBar::Shape>(tbshape))
#endif
{
#ifdef QT_NO_TABBAR
    Q_UNUSED(tbshape);
#endif
}

QSize QDockAreaLayoutInfo::size() const
{
    return isEmpty() ? QSize(0, 0) : rect.size();
}

void QDockAreaLayoutInfo::clear()
{
    item_list.clear();
    rect = QRect(0, 0, -1, -1);
#ifndef QT_NO_TABBAR
    tabbed = false;
    tabBar = 0;
#endif
}

bool QDockAreaLayoutInfo::isEmpty() const
{
    return next(-1) == -1;
}

QSize QDockAreaLayoutInfo::minimumSize() const
{
    if (isEmpty())
        return QSize(0, 0);

    int a = 0, b = 0;
    bool first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;

        QSize min_size = item.minimumSize();
#ifndef QT_NO_TABBAR
        if (tabbed) {
            a = qMax(a, pick(o, min_size));
        } else
#endif
        {
            if (!first)
                a += sep;
            a += pick(o, min_size);
        }
        b = qMax(b, perp(o, min_size));

        first = false;
    }

    QSize result;
    rpick(o, result) = a;
    rperp(o, result) = b;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QSize tbm = tabBarMinimumSize();
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
            case QTabBar::RoundedSouth:
                result.rheight() += tbm.height();
                result.rwidth() = qMax(tbm.width(), result.width());
                break;
            case QTabBar::RoundedEast:
            case QTabBar::RoundedWest:
                result.rheight() = qMax(tbm.height(), result.height());
                result.rwidth() += tbm.width();
                break;
            default:
                break;
        }
    }
#endif // QT_NO_TABBAR

    return result;
}

QSize QDockAreaLayoutInfo::maximumSize() const
{
    if (isEmpty())
        return QSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX);

    int a = 0, b = QWIDGETSIZE_MAX;
#ifndef QT_NO_TABBAR
    if (tabbed)
        a = QWIDGETSIZE_MAX;
#endif

    int min_perp = 0;

    bool first = true;
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;

        QSize max_size = item.maximumSize();
        min_perp = qMax(min_perp, perp(o, item.minimumSize()));

#ifndef QT_NO_TABBAR
        if (tabbed) {
            a = qMin(a, pick(o, max_size));
        } else
#endif
        {
            if (!first)
                a += sep;
            a += pick(o, max_size);
        }
        b = qMin(b, perp(o, max_size));

        a = qMin(a, int(QWIDGETSIZE_MAX));
        b = qMin(b, int(QWIDGETSIZE_MAX));

        first = false;
    }

    b = qMax(b, min_perp);

    QSize result;
    rpick(o, result) = a;
    rperp(o, result) = b;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QSize tbh = tabBarSizeHint();
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
            case QTabBar::RoundedSouth:
                result.rheight() += tbh.height();
                break;
            case QTabBar::RoundedEast:
            case QTabBar::RoundedWest:
                result.rwidth() += tbh.width();
                break;
            default:
                break;
        }
    }
#endif // QT_NO_TABBAR

    return result;
}

QSize QDockAreaLayoutInfo::sizeHint() const
{
    if (isEmpty())
        return QSize(0, 0);

    int a = 0, b = 0;
    bool prev_gap = false;
    bool first = true;
    int min_perp = 0;
    int max_perp = QWIDGETSIZE_MAX;
    for (int i = 0; i < item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = item_list.at(i);
        if (item.skip())
            continue;

        bool gap = item.gap;

        QSize size_hint = item.sizeHint();
        min_perp = qMax(min_perp, perp(o, item.minimumSize()));
        max_perp = qMin(max_perp, perp(o, item.maximumSize()));

#ifndef QT_NO_TABBAR
        if (tabbed) {
            a = qMax(a, gap ? item.size : pick(o, size_hint));
        } else
#endif
        {
            if (!first && !gap && !prev_gap)
                a += sep;
            a += gap ? item.size : pick(o, size_hint);
        }
        b = qMax(b, perp(o, size_hint));

        prev_gap = gap;
        first = false;
    }

    max_perp = qMax(max_perp, min_perp);
    b = qMax(b, min_perp);
    b = qMin(b, max_perp);

    QSize result;
    rpick(o, result) = a;
    rperp(o, result) = b;

#ifndef QT_NO_TABBAR
    if (tabbed) {
        QSize tbh = tabBarSizeHint();
        switch (tabBarShape) {
            case QTabBar::RoundedNorth:
            case QTabBar::RoundedSouth:
                result.rheight() += tbh.height();
                result.rwidth() = qMax(tbh.width(), result.width());
                break;
            case QTabBar::RoundedEast:
            case QTabBar::RoundedWest:
                result.rheight() = qMax(tbh.height(), result.height());
                result.rwidth() += tbh.width();
                break;
            default:
                break;
        }
    }
#endif // QT_NO_TABBAR

    return result;
}

bool QDockAreaLayoutInfo::expansive(Qt::Orientation o) const
{
    for (int i = 0; i < item_list.size(); ++i) {
        if (item_list.at(i).expansive(o))
            return true;
    }
    return false;
}

/* QDockAreaLayoutInfo::maximumSize() doesn't return the real max size. For example,
   if the layout is empty, it returns QWIDGETSIZE_MAX. This is so that empty dock areas
   don't constrain the size of the QMainWindow, but sometimes we really need to know the
   maximum size. Also, these functions take into account widgets that want to keep their
   size (f.ex. when they are hidden and then shown, they should not change size).
*/

static int realMinSize(const QDockAreaLayoutInfo &info)
{
    int result = 0;
    bool first = true;
    for (int i = 0; i < info.item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = info.item_list.at(i);
        if (item.skip())
            continue;

        int min = 0;
        if (item.keep_size && item.size != -1)
            min = item.size;
        else
            min = pick(info.o, item.minimumSize());

        if (!first)
            result += info.sep;
        result += min;

        first = false;
    }

    return result;
}

static int realMaxSize(const QDockAreaLayoutInfo &info)
{
    int result = 0;
    bool first = true;
    for (int i = 0; i < info.item_list.size(); ++i) {
        const QDockAreaLayoutItem &item = info.item_list.at(i);
        if (item.skip())
            continue;

        int max = 0;
        if (item.keep_size && item.size != -1)
            max = item.size;
        else
            max = pick(info.o, item.maximumSize());

        if (!first)
            result += info.sep;
        result += max;

        if (result >= QWIDGETSIZE_MAX)
            return QWIDGETSIZE_MAX;

        first = false;