--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gui/kernel/qwhatsthis.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,777 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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 "qwhatsthis.h"
+#ifndef QT_NO_WHATSTHIS
+#include "qpointer.h"
+#include "qapplication.h"
+#include "qdesktopwidget.h"
+#include "qevent.h"
+#include "qpixmap.h"
+#include "qpainter.h"
+#include "qtimer.h"
+#include "qhash.h"
+#include "qaction.h"
+#include "qcursor.h"
+#include "qbitmap.h"
+#include "qtextdocument.h"
+#include "../text/qtextdocumentlayout_p.h"
+#include "qtoolbutton.h"
+#include "qdebug.h"
+#ifndef QT_NO_ACCESSIBILITY
+#include "qaccessible.h"
+#endif
+#if defined(Q_WS_WIN)
+#include "qt_windows.h"
+#ifndef SPI_GETDROPSHADOW
+#define SPI_GETDROPSHADOW 0x1024
+#endif
+#endif
+#if defined(Q_WS_X11)
+#include "qx11info_x11.h"
+#include <qwidget.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class QWhatsThis
+ \brief The QWhatsThis class provides a simple description of any
+ widget, i.e. answering the question "What's This?".
+
+ \ingroup helpsystem
+
+
+ "What's This?" help is part of an application's online help
+ system, and provides users with information about the
+ functionality and usage of a particular widget. "What's This?"
+ help texts are typically longer and more detailed than \link
+ QToolTip tooltips\endlink, but generally provide less information
+ than that supplied by separate help windows.
+
+ QWhatsThis provides a single window with an explanatory text that
+ pops up when the user asks "What's This?". The default way for
+ users to ask the question is to move the focus to the relevant
+ widget and press Shift+F1. The help text appears immediately; it
+ goes away as soon as the user does something else.
+ (Note that if there is a shortcut for Shift+F1, this mechanism
+ will not work.) Some dialogs provide a "?" button that users can
+ click to enter "What's This?" mode; they then click the relevant
+ widget to pop up the "What's This?" window. It is also possible to
+ provide a a menu option or toolbar button to switch into "What's
+ This?" mode.
+
+ To add "What's This?" text to a widget or an action, you simply
+ call QWidget::setWhatsThis() or QAction::setWhatsThis().
+
+ The text can be either rich text or plain text. If you specify a
+ rich text formatted string, it will be rendered using the default
+ stylesheet, making it possible to embed images in the displayed
+ text. To be as fast as possible, the default stylesheet uses a
+ simple method to determine whether the text can be rendered as
+ plain text. See Qt::mightBeRichText() for details.
+
+ \snippet doc/src/snippets/whatsthis/whatsthis.cpp 0
+
+ An alternative way to enter "What's This?" mode is to call
+ createAction(), and add the returned QAction to either a menu or
+ a tool bar. By invoking this context help action (in the picture
+ below, the button with the arrow and question mark icon) the user
+ switches into "What's This?" mode. If they now click on a widget
+ the appropriate help text is shown. The mode is left when help is
+ given or when the user presses Esc.
+
+ \img whatsthis.png
+
+ You can enter "What's This?" mode programmatically with
+ enterWhatsThisMode(), check the mode with inWhatsThisMode(), and
+ return to normal mode with leaveWhatsThisMode().
+
+ If you want to control the "What's This?" behavior of a widget
+ manually see Qt::WA_CustomWhatsThis.
+
+ It is also possible to show different help texts for different
+ regions of a widget, by using a QHelpEvent of type
+ QEvent::WhatsThis. Intercept the help event in your widget's
+ QWidget::event() function and call QWhatsThis::showText() with the
+ text you want to display for the position specified in
+ QHelpEvent::pos(). If the text is rich text and the user clicks
+ on a link, the widget also receives a QWhatsThisClickedEvent with
+ the link's reference as QWhatsThisClickedEvent::href(). If a
+ QWhatsThisClickedEvent is handled (i.e. QWidget::event() returns
+ true), the help window remains visible. Call
+ QWhatsThis::hideText() to hide it explicitly.
+
+ \sa QToolTip
+*/
+
+extern void qDeleteInEventHandler(QObject *o);
+
+class QWhatsThat : public QWidget
+{
+ Q_OBJECT
+
+public:
+ QWhatsThat(const QString& txt, QWidget* parent, QWidget *showTextFor);
+ ~QWhatsThat() ;
+
+ static QWhatsThat *instance;
+
+protected:
+ void showEvent(QShowEvent *e);
+ void mousePressEvent(QMouseEvent*);
+ void mouseReleaseEvent(QMouseEvent*);
+ void mouseMoveEvent(QMouseEvent*);
+ void keyPressEvent(QKeyEvent*);
+ void paintEvent(QPaintEvent*);
+
+private:
+ QPointer<QWidget>widget;
+ bool pressed;
+ QString text;
+ QTextDocument* doc;
+ QString anchor;
+ QPixmap background;
+};
+
+QWhatsThat *QWhatsThat::instance = 0;
+
+// shadowWidth not const, for XP drop-shadow-fu turns it to 0
+static int shadowWidth = 6; // also used as '5' and '6' and even '8' below
+static const int vMargin = 8;
+static const int hMargin = 12;
+
+QWhatsThat::QWhatsThat(const QString& txt, QWidget* parent, QWidget *showTextFor)
+ : QWidget(parent, Qt::Popup),
+ widget(showTextFor), pressed(false), text(txt)
+{
+ delete instance;
+ instance = this;
+ setAttribute(Qt::WA_DeleteOnClose, true);
+ setAttribute(Qt::WA_NoSystemBackground, true);
+ if (parent)
+ setPalette(parent->palette());
+ setMouseTracking(true);
+ setFocusPolicy(Qt::StrongFocus);
+#ifndef QT_NO_CURSOR
+ setCursor(Qt::ArrowCursor);
+#endif
+ QRect r;
+ doc = 0;
+ ensurePolished(); // Ensures style sheet font before size calc
+ if (Qt::mightBeRichText(text)) {
+ doc = new QTextDocument();
+ doc->setUndoRedoEnabled(false);
+ doc->setDefaultFont(QApplication::font(this));
+#ifdef QT_NO_TEXTHTMLPARSER
+ doc->setPlainText(text);
+#else
+ doc->setHtml(text);
+#endif
+ doc->setUndoRedoEnabled(false);
+ doc->adjustSize();
+ r.setTop(0);
+ r.setLeft(0);
+ r.setSize(doc->size().toSize());
+ }
+ else
+ {
+ int sw = QApplication::desktop()->width() / 3;
+ if (sw < 200)
+ sw = 200;
+ else if (sw > 300)
+ sw = 300;
+
+ r = fontMetrics().boundingRect(0, 0, sw, 1000,
+ Qt::AlignLeft + Qt::AlignTop
+ + Qt::TextWordWrap + Qt::TextExpandTabs,
+ text);
+ }
+#if defined(Q_WS_WIN)
+ if ((QSysInfo::WindowsVersion >= QSysInfo::WV_XP
+ && QSysInfo::WindowsVersion < QSysInfo::WV_NT_based))
+ {
+ BOOL shadow;
+ SystemParametersInfo(SPI_GETDROPSHADOW, 0, &shadow, 0);
+ shadowWidth = shadow ? 0 : 6;
+ }
+#endif
+ resize(r.width() + 2*hMargin + shadowWidth, r.height() + 2*vMargin + shadowWidth);
+}
+
+QWhatsThat::~QWhatsThat()
+{
+ instance = 0;
+ if (doc)
+ delete doc;
+}
+
+void QWhatsThat::showEvent(QShowEvent *)
+{
+ background = QPixmap::grabWindow(QApplication::desktop()->internalWinId(),
+ x(), y(), width(), height());
+}
+
+void QWhatsThat::mousePressEvent(QMouseEvent* e)
+{
+ pressed = true;
+ if (e->button() == Qt::LeftButton && rect().contains(e->pos())) {
+ if (doc)
+ anchor = doc->documentLayout()->anchorAt(e->pos() - QPoint(hMargin, vMargin));
+ return;
+ }
+ close();
+}
+
+void QWhatsThat::mouseReleaseEvent(QMouseEvent* e)
+{
+ if (!pressed)
+ return;
+ if (widget && e->button() == Qt::LeftButton && doc && rect().contains(e->pos())) {
+ QString a = doc->documentLayout()->anchorAt(e->pos() - QPoint(hMargin, vMargin));
+ QString href;
+ if (anchor == a)
+ href = a;
+ anchor.clear();
+ if (!href.isEmpty()) {
+ QWhatsThisClickedEvent e(href);
+ if (QApplication::sendEvent(widget, &e))
+ return;
+ }
+ }
+ close();
+}
+
+void QWhatsThat::mouseMoveEvent(QMouseEvent* e)
+{
+#ifdef QT_NO_CURSOR
+ Q_UNUSED(e);
+#else
+ if (!doc)
+ return;
+ QString a = doc->documentLayout()->anchorAt(e->pos() - QPoint(hMargin, vMargin));
+ if (!a.isEmpty())
+ setCursor(Qt::PointingHandCursor);
+ else
+ setCursor(Qt::ArrowCursor);
+#endif
+}
+
+void QWhatsThat::keyPressEvent(QKeyEvent*)
+{
+ close();
+}
+
+void QWhatsThat::paintEvent(QPaintEvent*)
+{
+ bool drawShadow = true;
+#if defined(Q_WS_WIN)
+ if ((QSysInfo::WindowsVersion >= QSysInfo::WV_XP
+ && QSysInfo::WindowsVersion < QSysInfo::WV_NT_based))
+ {
+ BOOL shadow;
+ SystemParametersInfo(SPI_GETDROPSHADOW, 0, &shadow, 0);
+ drawShadow = !shadow;
+ }
+#elif defined(Q_WS_MAC) || defined(Q_WS_QWS)
+ drawShadow = false; // never draw it on OS X or QWS, as we get it for free
+#endif
+
+ QRect r = rect();
+ r.adjust(0, 0, -1, -1);
+ if (drawShadow)
+ r.adjust(0, 0, -shadowWidth, -shadowWidth);
+ QPainter p(this);
+ p.drawPixmap(0, 0, background);
+ p.setPen(QPen(palette().toolTipText(), 0));
+ p.setBrush(palette().toolTipBase());
+ p.drawRect(r);
+ int w = r.width();
+ int h = r.height();
+ p.setPen(palette().brush(QPalette::Dark).color());
+ p.drawRect(1, 1, w-2, h-2);
+ if (drawShadow) {
+ p.setPen(palette().shadow().color());
+ p.drawPoint(w + 5, 6);
+ p.drawLine(w + 3, 6, w + 5, 8);
+ p.drawLine(w + 1, 6, w + 5, 10);
+ int i;
+ for(i=7; i < h; i += 2)
+ p.drawLine(w, i, w + 5, i + 5);
+ for(i = w - i + h; i > 6; i -= 2)
+ p.drawLine(i, h, i + 5, h + 5);
+ for(; i > 0 ; i -= 2)
+ p.drawLine(6, h + 6 - i, i + 5, h + 5);
+ }
+ r.adjust(0, 0, 1, 1);
+ p.setPen(palette().toolTipText().color());
+ r.adjust(hMargin, vMargin, -hMargin, -vMargin);
+
+ if (doc) {
+ p.translate(r.x(), r.y());
+ QRect rect = r;
+ rect.translate(-r.x(), -r.y());
+ p.setClipRect(rect);
+ QAbstractTextDocumentLayout::PaintContext context;
+ context.palette.setBrush(QPalette::Text, context.palette.toolTipText());
+ doc->documentLayout()->draw(&p, context);
+ }
+ else
+ {
+ p.drawText(r, Qt::AlignLeft + Qt::AlignTop + Qt::TextWordWrap + Qt::TextExpandTabs, text);
+ }
+}
+
+static const char * const button_image[] = {
+"16 16 3 1",
+" c None",
+"o c #000000",
+"a c #000080",
+"o aaaaa ",
+"oo aaa aaa ",
+"ooo aaa aaa",
+"oooo aa aa",
+"ooooo aa aa",
+"oooooo a aaa",
+"ooooooo aaa ",
+"oooooooo aaa ",
+"ooooooooo aaa ",
+"ooooo aaa ",
+"oo ooo ",
+"o ooo aaa ",
+" ooo aaa ",
+" ooo ",
+" ooo ",
+" ooo "};
+
+class QWhatsThisPrivate : public QObject
+{
+ public:
+ QWhatsThisPrivate();
+ ~QWhatsThisPrivate();
+ static QWhatsThisPrivate *instance;
+ bool eventFilter(QObject *, QEvent *);
+ QPointer<QAction> action;
+#ifdef QT3_SUPPORT
+ QPointer<QToolButton> button;
+#endif
+ static void say(QWidget *, const QString &, int x = 0, int y = 0);
+ static void notifyToplevels(QEvent *e);
+ bool leaveOnMouseRelease;
+};
+
+void QWhatsThisPrivate::notifyToplevels(QEvent *e)
+{
+ QWidgetList toplevels = QApplication::topLevelWidgets();
+ for (int i = 0; i < toplevels.count(); ++i) {
+ register QWidget *w = toplevels.at(i);
+ QApplication::sendEvent(w, e);
+ }
+}
+
+QWhatsThisPrivate *QWhatsThisPrivate::instance = 0;
+
+QWhatsThisPrivate::QWhatsThisPrivate()
+ : leaveOnMouseRelease(false)
+{
+ instance = this;
+ qApp->installEventFilter(this);
+
+ QPoint pos = QCursor::pos();
+ if (QWidget *w = QApplication::widgetAt(pos)) {
+ QHelpEvent e(QEvent::QueryWhatsThis, w->mapFromGlobal(pos), pos);
+ bool sentEvent = QApplication::sendEvent(w, &e);
+#ifdef QT_NO_CURSOR
+ Q_UNUSED(sentEvent);
+#else
+ QApplication::setOverrideCursor((!sentEvent || !e.isAccepted())?
+ Qt::ForbiddenCursor:Qt::WhatsThisCursor);
+ } else {
+ QApplication::setOverrideCursor(Qt::WhatsThisCursor);
+#endif
+ }
+#ifndef QT_NO_ACCESSIBILITY
+ QAccessible::updateAccessibility(this, 0, QAccessible::ContextHelpStart);
+#endif
+}
+
+QWhatsThisPrivate::~QWhatsThisPrivate()
+{
+ if (action)
+ action->setChecked(false);
+#ifdef QT3_SUPPORT
+ if (button)
+ button->setChecked(false);
+#endif
+#ifndef QT_NO_CURSOR
+ QApplication::restoreOverrideCursor();
+#endif
+#ifndef QT_NO_ACCESSIBILITY
+ QAccessible::updateAccessibility(this, 0, QAccessible::ContextHelpEnd);
+#endif
+ instance = 0;
+}
+
+bool QWhatsThisPrivate::eventFilter(QObject *o, QEvent *e)
+{
+ if (!o->isWidgetType())
+ return false;
+ QWidget * w = static_cast<QWidget *>(o);
+ bool customWhatsThis = w->testAttribute(Qt::WA_CustomWhatsThis);
+ switch (e->type()) {
+ case QEvent::MouseButtonPress:
+ {
+ QMouseEvent *me = static_cast<QMouseEvent*>(e);
+ if (me->button() == Qt::RightButton || customWhatsThis)
+ return false;
+ QHelpEvent e(QEvent::WhatsThis, me->pos(), me->globalPos());
+ if (!QApplication::sendEvent(w, &e) || !e.isAccepted())
+ leaveOnMouseRelease = true;
+
+ } break;
+
+ case QEvent::MouseMove:
+ {
+ QMouseEvent *me = static_cast<QMouseEvent*>(e);
+ QHelpEvent e(QEvent::QueryWhatsThis, me->pos(), me->globalPos());
+ bool sentEvent = QApplication::sendEvent(w, &e);
+#ifdef QT_NO_CURSOR
+ Q_UNUSED(sentEvent);
+#else
+ QApplication::changeOverrideCursor((!sentEvent || !e.isAccepted())?
+ Qt::ForbiddenCursor:Qt::WhatsThisCursor);
+#endif
+ }
+ // fall through
+ case QEvent::MouseButtonRelease:
+ case QEvent::MouseButtonDblClick:
+ if (leaveOnMouseRelease && e->type() == QEvent::MouseButtonRelease)
+ QWhatsThis::leaveWhatsThisMode();
+ if (static_cast<QMouseEvent*>(e)->button() == Qt::RightButton || customWhatsThis)
+ return false; // ignore RMB release
+ break;
+ case QEvent::KeyPress:
+ {
+ QKeyEvent* kev = (QKeyEvent*)e;
+
+ if (kev->key() == Qt::Key_Escape) {
+ QWhatsThis::leaveWhatsThisMode();
+ return true;
+ } else if (customWhatsThis) {
+ return false;
+ } else if (kev->key() == Qt::Key_Menu ||
+ (kev->key() == Qt::Key_F10 &&
+ kev->modifiers() == Qt::ShiftModifier)) {
+ // we don't react to these keys, they are used for context menus
+ return false;
+ } else if (kev->key() != Qt::Key_Shift && kev->key() != Qt::Key_Alt // not a modifier key
+ && kev->key() != Qt::Key_Control && kev->key() != Qt::Key_Meta) {
+ QWhatsThis::leaveWhatsThisMode();
+ }
+ } break;
+ default:
+ return false;
+ }
+ return true;
+}
+
+class QWhatsThisAction: public QAction
+{
+ Q_OBJECT
+
+public:
+ explicit QWhatsThisAction(QObject* parent = 0);
+
+private slots:
+ void actionTriggered();
+};
+
+QWhatsThisAction::QWhatsThisAction(QObject *parent) : QAction(tr("What's This?"), parent)
+{
+#ifndef QT_NO_IMAGEFORMAT_XPM
+ QPixmap p((const char**)button_image);
+ setIcon(p);
+#endif
+ setCheckable(true);
+ connect(this, SIGNAL(triggered()), this, SLOT(actionTriggered()));
+#ifndef QT_NO_SHORTCUT
+ setShortcut(Qt::ShiftModifier + Qt::Key_F1);
+#endif
+}
+
+void QWhatsThisAction::actionTriggered()
+{
+ if (isChecked()) {
+ QWhatsThis::enterWhatsThisMode();
+ QWhatsThisPrivate::instance->action = this;
+ }
+}
+
+QWhatsThis::QWhatsThis()
+{
+}
+
+#ifdef QT3_SUPPORT
+/*!
+ \obsolete
+
+ Sets the What's This text \a s for the widget \a w.
+
+ Use QWidget::setWhatsThis() or QAction::setWhatsThis() instead.
+*/
+void QWhatsThis::add(QWidget *w, const QString &s)
+{
+ w->setWhatsThis(s);
+}
+
+/*!
+ \obsolete
+
+ Remove's the What's This text for the widget \a w.
+
+ Use QWidget::setWhatsThis() or QAction::setWhatsThis() instead.
+*/
+void QWhatsThis::remove(QWidget *w)
+{
+ w->setWhatsThis(QString());
+}
+
+class QWhatsThisButton : public QToolButton
+{
+ Q_OBJECT
+public:
+ QWhatsThisButton(QWidget *p) : QToolButton(p) {
+ setCheckable(true);
+ QPixmap pix( const_cast<const char**>(button_image) );
+ setIcon( pix );
+ QObject::connect(this, SIGNAL(toggled(bool)), this, SLOT(whatToggled(bool)));
+ setAutoRaise(true);
+ setFocusPolicy(Qt::NoFocus);
+ }
+
+public slots:
+ void whatToggled(bool b) {
+ if (b) {
+ QWhatsThis::enterWhatsThisMode();
+ QWhatsThisPrivate::instance->button = this;
+ }
+ }
+};
+
+/*!
+ Returns a new "What's This?" QToolButton with the given \a
+ parent. To do this now, create your own QToolButton and a
+ QWhatsThis object and call the QWhatsThis object's showText()
+ function when the QToolButton is invoked.
+
+ Use createAction() instead.
+*/
+QToolButton * QWhatsThis::whatsThisButton(QWidget * parent)
+{
+ return new QWhatsThisButton(parent);
+}
+#endif
+
+/*!
+ This function switches the user interface into "What's This?"
+ mode. The user interface can be switched back into normal mode by
+ the user (e.g. by them clicking or pressing Esc), or
+ programmatically by calling leaveWhatsThisMode().
+
+ When entering "What's This?" mode, a QEvent of type
+ Qt::EnterWhatsThisMode is sent to all toplevel widgets.
+
+ \sa inWhatsThisMode() leaveWhatsThisMode()
+*/
+void QWhatsThis::enterWhatsThisMode()
+{
+ if (QWhatsThisPrivate::instance)
+ return;
+ (void) new QWhatsThisPrivate;
+ QEvent e(QEvent::EnterWhatsThisMode);
+ QWhatsThisPrivate::notifyToplevels(&e);
+ }
+
+/*!
+ Returns true if the user interface is in "What's This?" mode;
+ otherwise returns false.
+
+ \sa enterWhatsThisMode()
+*/
+bool QWhatsThis::inWhatsThisMode()
+{
+ return (QWhatsThisPrivate::instance != 0);
+}
+
+/*!
+ If the user interface is in "What's This?" mode, this function
+ switches back to normal mode; otherwise it does nothing.
+
+ When leaving "What's This?" mode, a QEvent of type
+ Qt::LeaveWhatsThisMode is sent to all toplevel widgets.
+
+ \sa enterWhatsThisMode() inWhatsThisMode()
+*/
+void QWhatsThis::leaveWhatsThisMode()
+{
+ delete QWhatsThisPrivate::instance;
+ QEvent e(QEvent::LeaveWhatsThisMode);
+ QWhatsThisPrivate::notifyToplevels(&e);
+}
+
+void QWhatsThisPrivate::say(QWidget * widget, const QString &text, int x, int y)
+{
+ if (text.size() == 0)
+ return;
+ // make a fresh widget, and set it up
+ QWhatsThat *whatsThat = new QWhatsThat(
+ text,
+#if defined(Q_WS_X11) && !defined(QT_NO_CURSOR)
+ QApplication::desktop()->screen(widget ? widget->x11Info().screen() : QCursor::x11Screen()),
+#else
+ 0,
+#endif
+ widget
+ );
+
+
+ // okay, now to find a suitable location
+
+ int scr = (widget ?
+ QApplication::desktop()->screenNumber(widget) :
+#if defined(Q_WS_X11) && !defined(QT_NO_CURSOR)
+ QCursor::x11Screen()
+#else
+ QApplication::desktop()->screenNumber(QPoint(x,y))
+#endif // Q_WS_X11
+ );
+ QRect screen = QApplication::desktop()->screenGeometry(scr);
+
+ int w = whatsThat->width();
+ int h = whatsThat->height();
+ int sx = screen.x();
+ int sy = screen.y();
+
+ // first try locating the widget immediately above/below,
+ // with nice alignment if possible.
+ QPoint pos;
+ if (widget)
+ pos = widget->mapToGlobal(QPoint(0,0));
+
+ if (widget && w > widget->width() + 16)
+ x = pos.x() + widget->width()/2 - w/2;
+ else
+ x = x - w/2;
+
+ // squeeze it in if that would result in part of what's this
+ // being only partially visible
+ if (x + w + shadowWidth > sx+screen.width())
+ x = (widget? (qMin(screen.width(),
+ pos.x() + widget->width())
+ ) : screen.width())
+ - w;
+
+ if (x < sx)
+ x = sx;
+
+ if (widget && h > widget->height() + 16) {
+ y = pos.y() + widget->height() + 2; // below, two pixels spacing
+ // what's this is above or below, wherever there's most space
+ if (y + h + 10 > sy+screen.height())
+ y = pos.y() + 2 - shadowWidth - h; // above, overlap
+ }
+ y = y + 2;
+
+ // squeeze it in if that would result in part of what's this
+ // being only partially visible
+ if (y + h + shadowWidth > sy+screen.height())
+ y = (widget ? (qMin(screen.height(),
+ pos.y() + widget->height())
+ ) : screen.height())
+ - h;
+ if (y < sy)
+ y = sy;
+
+ whatsThat->move(x, y);
+ whatsThat->show();
+ whatsThat->grabKeyboard();
+}
+
+/*!
+ Shows \a text as a "What's This?" window, at global position \a
+ pos. The optional widget argument, \a w, is used to determine the
+ appropriate screen on multi-head systems.
+
+ \sa hideText()
+*/
+void QWhatsThis::showText(const QPoint &pos, const QString &text, QWidget *w)
+{
+ leaveWhatsThisMode();
+ QWhatsThisPrivate::say(w, text, pos.x(), pos.y());
+}
+
+/*!
+ If a "What's This?" window is showing, this destroys it.
+
+ \sa showText()
+*/
+void QWhatsThis::hideText()
+{
+ qDeleteInEventHandler(QWhatsThat::instance);
+}
+
+/*!
+ Returns a ready-made QAction, used to invoke "What's This?" context
+ help, with the given \a parent.
+
+ The returned QAction provides a convenient way to let users enter
+ "What's This?" mode.
+*/
+QAction *QWhatsThis::createAction(QObject *parent)
+{
+ return new QWhatsThisAction(parent);
+}
+
+QT_END_NAMESPACE
+
+#include "qwhatsthis.moc"
+
+#endif // QT_NO_WHATSTHIS