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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "q3whatsthis.h"
#ifndef QT_NO_WHATSTHIS
#include "qapplication.h"
#include "qwidget.h"
#include "qevent.h"
QT_BEGIN_NAMESPACE
/*! \class Q3WhatsThis
\compat
*/
/*!
Constructs a new "What's This?" object for \a widget.
*/
Q3WhatsThis::Q3WhatsThis(QWidget *widget)
: QObject(widget)
{
if (widget)
widget->installEventFilter(this);
}
/*!
Destroys the "What's This?" object.
*/
Q3WhatsThis::~Q3WhatsThis()
{
}
/*!
\internal
Handles "What's This?" events.
*/
bool Q3WhatsThis::eventFilter(QObject *o, QEvent *e)
{
if (o != parent() || !o->isWidgetType())
return false;
if (e->type() == QEvent::WhatsThis) {
QString s = text(static_cast<QHelpEvent*>(e)->pos());
if (!s.isEmpty())
QWhatsThis::showText(static_cast<QHelpEvent*>(e)->globalPos(), s, static_cast<QWidget*>(o));
} else if (e->type() == QEvent::QueryWhatsThis) {
QString s = text(static_cast<QHelpEvent*>(e)->pos());
if (s.isEmpty())
return false;
} else if (e->type() == QEvent::WhatsThisClicked) {
QString href = static_cast<QWhatsThisClickedEvent*>(e)->href();
if (clicked(href))
QWhatsThis::hideText();
} else {
return false;
}
return true;
}
/*!
This virtual function returns the text for position \a pos in the
widget that this "What's This?" object documents. If there is no
"What's This?" text for the position, an empty string is returned.
The default implementation returns an empty string.
*/
QString Q3WhatsThis::text(const QPoint & /* pos */)
{
if (parent() && parent()->isWidgetType())
return static_cast<QWidget*>(parent())->whatsThis();
return QString();
}
/*!
This virtual function is called when the user clicks inside the
"What's this?" window. \a href is the link the user clicked on, or
an empty string if there was no link.
If the function returns true (the default), the "What's this?"
window is closed, otherwise it remains visible.
The default implementation ignores \a href and returns true.
*/
bool Q3WhatsThis::clicked(const QString & /* href */)
{
return true;
}
/*!
\fn void Q3WhatsThis::enterWhatsThisMode()
Enters "What's This?" mode and returns immediately.
Qt will install a special cursor and take over mouse input until
the user clicks somewhere. It then shows any help available and
ends "What's This?" mode. Finally, Qt removes the special cursor
and help window and then restores ordinary event processing, at
which point the left mouse button is no longer pressed.
The user can also use the Esc key to leave "What's This?" mode.
\sa inWhatsThisMode(), leaveWhatsThisMode()
*/
/*!
\fn bool Q3WhatsThis::inWhatsThisMode()
Returns true if the application is in "What's This?" mode;
otherwise returns false.
\sa enterWhatsThisMode(), leaveWhatsThisMode()
*/
/*!
\fn void Q3WhatsThis::add(QWidget *widget, const QString &text)
Adds \a text as "What's This?" help for \a widget. If the text is
rich text formatted (i.e. it contains markup) it will be rendered
with the default stylesheet QStyleSheet::defaultSheet().
The text is destroyed if the widget is later destroyed, so it need
not be explicitly removed.
\sa remove()
*/
/*!
\fn void Q3WhatsThis::remove(QWidget *widget)
Removes the "What's This?" help associated with the \a widget.
This happens automatically if the widget is destroyed.
\sa add()
*/
/*!
\fn void Q3WhatsThis::leaveWhatsThisMode(const QString& text = QString(), const QPoint& pos = QCursor::pos(), QWidget* widget = 0)
This function is used internally by widgets that support
QWidget::customWhatsThis(); applications do not usually call it.
An example of such a widget is Q3PopupMenu: menus still work
normally in "What's This?" mode but also provide help texts for
individual menu items.
If \a text is not empty, a "What's This?" help window is
displayed at the global screen position \a pos. If widget \a widget is
not 0 and has its own dedicated QWhatsThis object, this object
will receive clicked() messages when the user clicks on hyperlinks
inside the help text.
\sa inWhatsThisMode(), enterWhatsThisMode(), clicked()
*/
/*!
\fn void Q3WhatsThis::display(const QString &text, const QPoint &pos, QWidget *widget)
Display \a text in a help window at the global screen position \a
pos.
If widget \a widget is not 0 and has its own dedicated QWhatsThis
object, this object will receive clicked() messages when the user
clicks on hyperlinks inside the help text.
\sa clicked()
*/
/*!
Creates a QToolButton preconfigured to enter "What's This?" mode
when clicked. You will often use this with a tool bar as \a
parent:
\snippet doc/src/snippets/code/src_qt3support_widgets_q3whatsthis.cpp 0
*/
QToolButton *Q3WhatsThis::whatsThisButton(QWidget * parent)
{
return QWhatsThis::whatsThisButton(parent);
}
QT_END_NAMESPACE
#endif // QT_NO_WHATSTHIS
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