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Diffstat (limited to 'src/widgets/widgets/qfocusframe.cpp')
-rw-r--r-- | src/widgets/widgets/qfocusframe.cpp | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/src/widgets/widgets/qfocusframe.cpp b/src/widgets/widgets/qfocusframe.cpp new file mode 100644 index 0000000000..6508c31b50 --- /dev/null +++ b/src/widgets/widgets/qfocusframe.cpp @@ -0,0 +1,339 @@ +/**************************************************************************** +** +** 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 "qfocusframe.h" +#include "qstyle.h" +#include "qbitmap.h" +#include "qstylepainter.h" +#include "qstyleoption.h" +#include "qdebug.h" +#include <private/qwidget_p.h> + +QT_BEGIN_NAMESPACE + +class QFocusFramePrivate : public QWidgetPrivate +{ + Q_DECLARE_PUBLIC(QFocusFrame) + QWidget *widget; + QWidget *frameParent; + bool showFrameAboveWidget; +public: + QFocusFramePrivate() { + widget = 0; + frameParent = 0; + sendChildEvents = false; + showFrameAboveWidget = false; + } + void updateSize(); + void update(); +}; + +void QFocusFramePrivate::update() +{ + Q_Q(QFocusFrame); + q->setParent(frameParent); + updateSize(); + if (q->parentWidget()->rect().intersects(q->geometry())) { + if (showFrameAboveWidget) + q->raise(); + else + q->stackUnder(widget); + q->show(); + } else { + q->hide(); + } +} + +void QFocusFramePrivate::updateSize() +{ + Q_Q(QFocusFrame); + if (!widget) + return; + + int vmargin = q->style()->pixelMetric(QStyle::PM_FocusFrameVMargin), + hmargin = q->style()->pixelMetric(QStyle::PM_FocusFrameHMargin); + QPoint pos(widget->x(), widget->y()); + if (q->parentWidget() != widget->parentWidget()) + pos = widget->parentWidget()->mapTo(q->parentWidget(), pos); + QRect geom(pos.x()-hmargin, pos.y()-vmargin, + widget->width()+(hmargin*2), widget->height()+(vmargin*2)); + if(q->geometry() == geom) + return; + + q->setGeometry(geom); + QStyleHintReturnMask mask; + QStyleOption opt; + q->initStyleOption(&opt); + if (q->style()->styleHint(QStyle::SH_FocusFrame_Mask, &opt, q, &mask)) + q->setMask(mask.region); +} + +/*! + Initialize \a option with the values from this QFocusFrame. This method is useful + for subclasses when they need a QStyleOption, but don't want to fill + in all the information themselves. + + \sa QStyleOption::initFrom() +*/ +void QFocusFrame::initStyleOption(QStyleOption *option) const +{ + if (!option) + return; + + option->initFrom(this); +} + +/*! + \class QFocusFrame + \brief The QFocusFrame widget provides a focus frame which can be + outside of a widget's normal paintable area. + + \ingroup basicwidgets + + + Normally an application will not need to create its own + QFocusFrame as QStyle will handle this detail for + you. A style writer can optionally use a QFocusFrame to have a + focus area outside of the widget's paintable geometry. In this way + space need not be reserved for the widget to have focus but only + set on a QWidget with QFocusFrame::setWidget. It is, however, + legal to create your own QFocusFrame on a custom widget and set + its geometry manually via QWidget::setGeometry however you will + not get auto-placement when the focused widget changes size or + placement. +*/ + +/*! + Constructs a QFocusFrame. + + The focus frame will not monitor \a parent for updates but rather + can be placed manually or by using QFocusFrame::setWidget. A + QFocusFrame sets Qt::WA_NoChildEventsForParent attribute; as a + result the parent will not receive a QEvent::ChildInserted event, + this will make it possible to manually set the geometry of the + QFocusFrame inside of a QSplitter or other child event monitoring + widget. + + \sa QFocusFrame::setWidget() +*/ + +QFocusFrame::QFocusFrame(QWidget *parent) + : QWidget(*new QFocusFramePrivate, parent, 0) +{ + setAttribute(Qt::WA_TransparentForMouseEvents); + setFocusPolicy(Qt::NoFocus); + setAttribute(Qt::WA_NoChildEventsForParent, true); + setAttribute(Qt::WA_AcceptDrops, style()->styleHint(QStyle::SH_FocusFrame_AboveWidget, 0, this)); +} + +/*! + Destructor. +*/ + +QFocusFrame::~QFocusFrame() +{ +} + +/*! + QFocusFrame will track changes to \a widget and resize itself automatically. + If the monitored widget's parent changes, QFocusFrame will follow the widget + and place itself around the widget automatically. If the monitored widget is deleted, + QFocusFrame will set it to zero. + + \sa QFocusFrame::widget() +*/ + +void +QFocusFrame::setWidget(QWidget *widget) +{ + Q_D(QFocusFrame); + + if (style()->styleHint(QStyle::SH_FocusFrame_AboveWidget, 0, this)) + d->showFrameAboveWidget = true; + else + d->showFrameAboveWidget = false; + + if (widget == d->widget) + return; + if (d->widget) { + // Remove event filters from the widget hierarchy. + QWidget *p = d->widget; + do { + p->removeEventFilter(this); + if (!d->showFrameAboveWidget || p == d->frameParent) + break; + p = p->parentWidget(); + }while (p); + } + if (widget && !widget->isWindow() && widget->parentWidget()->windowType() != Qt::SubWindow) { + d->widget = widget; + d->widget->installEventFilter(this); + QWidget *p = widget->parentWidget(); + QWidget *prev = 0; + if (d->showFrameAboveWidget) { + // Find the right parent for the focus frame. + while (p) { + // Traverse the hirerarchy of the 'widget' for setting event filter. + // During this if come across toolbar or a top level, use that + // as the parent for the focus frame. If we find a scroll area + // use its viewport as the parent. + bool isScrollArea = false; + if (p->isWindow() || p->inherits("QToolBar") || (isScrollArea = p->inherits("QAbstractScrollArea"))) { + d->frameParent = p; + // The previous one in the hierarchy will be the viewport. + if (prev && isScrollArea) + d->frameParent = prev; + break; + } else { + p->installEventFilter(this); + prev = p; + p = p->parentWidget(); + } + } + } else { + d->frameParent = p; + } + d->update(); + } else { + d->widget = 0; + hide(); + } +} + +/*! + Returns the currently monitored widget for automatically resize and + update. + + \sa QFocusFrame::setWidget() +*/ + +QWidget * +QFocusFrame::widget() const +{ + Q_D(const QFocusFrame); + return d->widget; +} + + +/*! \reimp */ +void +QFocusFrame::paintEvent(QPaintEvent *) +{ + Q_D(QFocusFrame); + QStylePainter p(this); + QStyleOption option; + initStyleOption(&option); + int vmargin = style()->pixelMetric(QStyle::PM_FocusFrameVMargin); + int hmargin = style()->pixelMetric(QStyle::PM_FocusFrameHMargin); + QWidgetPrivate *wd = qt_widget_private(d->widget); + QRect rect = wd->clipRect().adjusted(0, 0, hmargin*2, vmargin*2); + p.setClipRect(rect); + p.drawControl(QStyle::CE_FocusFrame, option); +} + + +/*! \reimp */ +bool +QFocusFrame::eventFilter(QObject *o, QEvent *e) +{ + Q_D(QFocusFrame); + if(o == d->widget) { + switch(e->type()) { + case QEvent::Move: + case QEvent::Resize: + d->updateSize(); + break; + case QEvent::Hide: + case QEvent::StyleChange: + hide(); + break; + case QEvent::ParentChange: + if (d->showFrameAboveWidget) { + QWidget *w = d->widget; + setWidget(0); + setWidget(w); + } else { + d->update(); + } + break; + case QEvent::Show: + d->update(); + show(); + break; + case QEvent::PaletteChange: + setPalette(d->widget->palette()); + break; + case QEvent::ZOrderChange: + if (style()->styleHint(QStyle::SH_FocusFrame_AboveWidget, 0, this)) + raise(); + else + stackUnder(d->widget); + break; + case QEvent::Destroy: + setWidget(0); + break; + default: + break; + } + } else if (d->showFrameAboveWidget) { + // Handle changes in the parent widgets we are monitoring. + switch(e->type()) { + case QEvent::Move: + case QEvent::Resize: + d->updateSize(); + break; + case QEvent::ZOrderChange: + raise(); + break; + default: + break; + } + } + return false; +} + +/*! \reimp */ +bool QFocusFrame::event(QEvent *e) +{ + return QWidget::event(e); +} + +QT_END_NAMESPACE |