source: trunk/src/gui/graphicsview/qgraphicswidget_p.cpp@ 396

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#include "qglobal.h"

#ifndef QT_NO_GRAPHICSVIEW

#include <QtCore/qdebug.h>
#include "qgraphicswidget_p.h"
#include "qgraphicslayout.h"
#include "qgraphicsscene_p.h"
#include <QtGui/qapplication.h>
#include <QtGui/qgraphicsscene.h>
#include <QtGui/qstyleoption.h>
#include <QtGui/QStyleOptionTitleBar>
#include <QtGui/QGraphicsSceneMouseEvent>
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
# include <QMacStyle>
#endif

QT_BEGIN_NAMESPACE

void QGraphicsWidgetPrivate::init(QGraphicsItem *parentItem, Qt::WindowFlags wFlags)
{
    Q_Q(QGraphicsWidget);

    attributes = 0;
    isWidget = 1; // QGraphicsItem::isWidget() returns true.
    focusNext = focusPrev = q;
    focusPolicy = Qt::NoFocus;
    q->setParentItem(parentItem);
    q->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::DefaultType));
    q->setGraphicsItem(q);

    resolveLayoutDirection();

    if (!parentItem)
        adjustWindowFlags(&wFlags);
    windowFlags = wFlags;
    q->unsetWindowFrameMargins();
}
qreal QGraphicsWidgetPrivate::titleBarHeight(const QStyleOptionTitleBar &options) const
{
    Q_Q(const QGraphicsWidget);
    int height = q->style()->pixelMetric(QStyle::PM_TitleBarHeight, &options);
#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
    if (qobject_cast<QMacStyle*>(q->style())) {
        height -=4;
    }
#endif
    return (qreal)height;
}

void QGraphicsWidgetPrivate::getLayoutItemMargins(qreal *left, qreal *top, qreal *right, qreal *bottom) const
{
    if (left)
        *left = leftLayoutItemMargin;
    if (top)
        *top = topLayoutItemMargin;
    if (right)
        *right = rightLayoutItemMargin;
    if (bottom)
        *bottom = bottomLayoutItemMargin;
}

void QGraphicsWidgetPrivate::setLayoutItemMargins(qreal left, qreal top, qreal right, qreal bottom)
{
    if (leftLayoutItemMargin == left
        && topLayoutItemMargin == top
        && rightLayoutItemMargin == right
        && bottomLayoutItemMargin == bottom)
        return;

    Q_Q(QGraphicsWidget);
    leftLayoutItemMargin = left;
    topLayoutItemMargin = top;
    rightLayoutItemMargin = right;
    bottomLayoutItemMargin = bottom;
    q->updateGeometry();
}

void QGraphicsWidgetPrivate::setLayoutItemMargins(QStyle::SubElement element, const QStyleOption *opt)
{
    Q_Q(QGraphicsWidget);
    QStyleOption myOpt;
    if (!opt) {
        q->initStyleOption(&myOpt);
        myOpt.rect.setRect(0, 0, 32768, 32768);     // arbitrary
        opt = &myOpt;
    }

    QRect liRect = q->style()->subElementRect(element, opt, /* q */ 0);
    if (liRect.isValid()) {
        leftLayoutItemMargin = (opt->rect.left() - liRect.left());
        topLayoutItemMargin = (opt->rect.top() - liRect.top());
        rightLayoutItemMargin = (liRect.right() - opt->rect.right());
        bottomLayoutItemMargin = (liRect.bottom() - opt->rect.bottom());
    } else {
        leftLayoutItemMargin = 0;
        topLayoutItemMargin = 0;
        rightLayoutItemMargin = 0;
        bottomLayoutItemMargin = 0;
    }
}

void QGraphicsWidgetPrivate::setPalette_helper(const QPalette &palette)
{
    if (this->palette == palette && this->palette.resolve() == palette.resolve())
        return;
    updatePalette(palette);
}

void QGraphicsWidgetPrivate::resolvePalette(uint inheritedMask)
{
    inheritedPaletteResolveMask = inheritedMask;
    QPalette naturalPalette = naturalWidgetPalette();
    QPalette resolvedPalette = palette.resolve(naturalPalette);
    updatePalette(resolvedPalette);
}

void QGraphicsWidgetPrivate::updatePalette(const QPalette &palette)
{
    Q_Q(QGraphicsWidget);
    // Update local palette setting.
    this->palette = palette;

    // Calculate new mask.
    if (q->isWindow() && !q->testAttribute(Qt::WA_WindowPropagation))
        inheritedPaletteResolveMask = 0;
    int mask = palette.resolve() | inheritedPaletteResolveMask;

    // Propagate to children.
    for (int i = 0; i < children.size(); ++i) {
        QGraphicsItem *item = children.at(i);
        if (item->isWidget()) {
            QGraphicsWidget *w = static_cast<QGraphicsWidget *>(item);
            if (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))
                w->d_func()->resolvePalette(mask);
        } else {
            item->d_ptr->resolvePalette(mask);
        }
    }

    // Notify change.
    QEvent event(QEvent::PaletteChange);
    QApplication::sendEvent(q, &event);
}

void QGraphicsWidgetPrivate::setLayoutDirection_helper(Qt::LayoutDirection direction)
{
    Q_Q(QGraphicsWidget);
    if ((direction == Qt::RightToLeft) == (testAttribute(Qt::WA_RightToLeft)))
        return;
    q->setAttribute(Qt::WA_RightToLeft, (direction == Qt::RightToLeft));

    // Propagate this change to all children.
    for (int i = 0; i < children.size(); ++i) {
        QGraphicsItem *item = children.at(i);
        if (item->isWidget()) {
            QGraphicsWidget *widget = static_cast<QGraphicsWidget *>(item);
            if (widget->parentWidget() && !widget->testAttribute(Qt::WA_SetLayoutDirection))
                widget->d_func()->setLayoutDirection_helper(direction);
        }
    }

    // Send the notification event to this widget item.
    QEvent e(QEvent::LayoutDirectionChange);
    QApplication::sendEvent(q, &e);
}

void QGraphicsWidgetPrivate::resolveLayoutDirection()
{
    Q_Q(QGraphicsWidget);
    if (q->testAttribute(Qt::WA_SetLayoutDirection)) {
        return;
    }
    if (QGraphicsWidget *parentWidget = q->parentWidget()) {
        setLayoutDirection_helper(parentWidget->layoutDirection());
    } else if (scene) {
        // ### shouldn't the scene have a layoutdirection really? how does
        // ### QGraphicsWidget get changes from QApplication::layoutDirection?
        setLayoutDirection_helper(QApplication::layoutDirection());
    } else {
        setLayoutDirection_helper(QApplication::layoutDirection());
    }
}

QPalette QGraphicsWidgetPrivate::naturalWidgetPalette() const
{
    Q_Q(const QGraphicsWidget);
    QPalette palette;
    if (QGraphicsWidget *parent = q->parentWidget()) {
        palette = parent->palette();
    } else if (scene) {
        palette = scene->palette();
    }
    palette.resolve(0);
    return palette;
}

void QGraphicsWidgetPrivate::setFont_helper(const QFont &font)
{
    if (this->font == font && this->font.resolve() == font.resolve())
        return;
    updateFont(font);
}

void QGraphicsWidgetPrivate::resolveFont(uint inheritedMask)
{
    inheritedFontResolveMask = inheritedMask;
    QFont naturalFont = naturalWidgetFont();
    QFont resolvedFont = font.resolve(naturalFont);
    updateFont(resolvedFont);
}

void QGraphicsWidgetPrivate::updateFont(const QFont &font)
{
    Q_Q(QGraphicsWidget);
    // Update the local font setting.
    this->font = font;

    // Calculate new mask.
    if (q->isWindow() && !q->testAttribute(Qt::WA_WindowPropagation))
        inheritedFontResolveMask = 0;
    int mask = font.resolve() | inheritedFontResolveMask;

    // Propagate to children.
    for (int i = 0; i < children.size(); ++i) {
        QGraphicsItem *item = children.at(i);
        if (item->isWidget()) {
            QGraphicsWidget *w = static_cast<QGraphicsWidget *>(item);
            if (!w->isWindow() || w->testAttribute(Qt::WA_WindowPropagation))
                w->d_func()->resolveFont(mask);
        } else {
            item->d_ptr->resolveFont(mask);
        }
    }

    if (!polished)
        return;
    // Notify change.
    QEvent event(QEvent::FontChange);
    QApplication::sendEvent(q, &event);
}

QFont QGraphicsWidgetPrivate::naturalWidgetFont() const
{
    Q_Q(const QGraphicsWidget);
    QFont naturalFont; // ### no application font support
    if (QGraphicsWidget *parent = q->parentWidget()) {
        naturalFont = parent->font();
    } else if (scene) {
        naturalFont = scene->font();
    }
    naturalFont.resolve(0);
    return naturalFont;
}

void QGraphicsWidgetPrivate::initStyleOptionTitleBar(QStyleOptionTitleBar *option)
{
    Q_Q(QGraphicsWidget);
    q->initStyleOption(option);
    option->rect.setHeight(titleBarHeight(*option));
    option->titleBarFlags = windowFlags;