summaryrefslogtreecommitdiffstats
path: root/src/widgets/kernel/qtooltip.cpp
blob: 16fb41e1fca7630bb3caec88584900fcdc953ec9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtWidgets 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifdef Q_WS_MAC
# include <private/qcore_mac_p.h>
#endif

#include <qapplication.h>
#include <qdesktopwidget.h>
#include <qevent.h>
#include <qhash.h>
#include <qlabel.h>
#include <qpointer.h>
#include <qstyle.h>
#include <qstyleoption.h>
#include <qstylepainter.h>
#include <qtimer.h>
#include <qtooltip.h>
#include <private/qeffects_p.h>
#include <qtextdocument.h>
#include <qdebug.h>
#include <private/qstylesheetstyle_p.h>
#ifndef QT_NO_TOOLTIP

#ifdef Q_WS_MAC
# include <private/qcore_mac_p.h>
#include <private/qt_cocoa_helpers_mac_p.h>
#endif

QT_BEGIN_NAMESPACE

/*!
    \class QToolTip

    \brief The QToolTip class provides tool tips (balloon help) for any
    widget.

    \ingroup helpsystem
    \inmodule QtWidgets

    The tip is a short piece of text reminding the user of the
    widget's function. It is drawn immediately below the given
    position in a distinctive black-on-yellow color combination. The
    tip can be any \l{QTextEdit}{rich text} formatted string.

    Rich text displayed in a tool tip is implicitly word-wrapped unless
    specified differently with \c{<p style='white-space:pre'>}.

    The simplest and most common way to set a widget's tool tip is by
    calling its QWidget::setToolTip() function.

    It is also possible to show different tool tips for different
    regions of a widget, by using a QHelpEvent of type
    QEvent::ToolTip. Intercept the help event in your widget's \l
    {QWidget::}{event()} function and call QToolTip::showText() with
    the text you want to display. The \l{widgets/tooltips}{Tooltips}
    example illustrates this technique.

    If you are calling QToolTip::hideText(), or QToolTip::showText()
    with an empty string, as a result of a \l{QEvent::}{ToolTip}-event you
    should also call \l{QEvent::}{ignore()} on the event, to signal
    that you don't want to start any tooltip specific modes.

    Note that, if you want to show tooltips in an item view, the
    model/view architecture provides functionality to set an item's
    tool tip; e.g., the QTableWidgetItem::setToolTip() function.
    However, if you want to provide custom tool tips in an item view,
    you must intercept the help event in the
    QAbstractItemView::viewportEvent() function and handle it yourself.

    The default tool tip color and font can be customized with
    setPalette() and setFont(). When a tooltip is currently on
    display, isVisible() returns \c true and text() the currently visible
    text.

    \note Tool tips use the inactive color group of QPalette, because tool
    tips are not active windows.

    \sa QWidget::toolTip, QAction::toolTip, {Tool Tips Example}
*/

class QTipLabel : public QLabel
{
    Q_OBJECT
public:
    QTipLabel(const QString &text, QWidget *w, int msecDisplayTime);
    ~QTipLabel();
    static QTipLabel *instance;

    bool eventFilter(QObject *, QEvent *);

    QBasicTimer hideTimer, expireTimer;

    bool fadingOut;

    void reuseTip(const QString &text, int msecDisplayTime);
    void hideTip();
    void hideTipImmediately();
    void setTipRect(QWidget *w, const QRect &r);
    void restartExpireTimer(int msecDisplayTime);
    bool tipChanged(const QPoint &pos, const QString &text, QObject *o);
    void placeTip(const QPoint &pos, QWidget *w);

    static int getTipScreen(const QPoint &pos, QWidget *w);
protected:
    void timerEvent(QTimerEvent *e);
    void paintEvent(QPaintEvent *e);
    void mouseMoveEvent(QMouseEvent *e);
    void resizeEvent(QResizeEvent *e);

#ifndef QT_NO_STYLE_STYLESHEET
public slots:
    /** \internal
      Cleanup the _q_stylesheet_parent propery.
     */
    void styleSheetParentDestroyed() {
        setProperty("_q_stylesheet_parent", QVariant());
        styleSheetParent = 0;
    }

private:
    QWidget *styleSheetParent;
#endif

private:
    QWidget *widget;
    QRect rect;
};

QTipLabel *QTipLabel::instance = 0;

QTipLabel::QTipLabel(const QString &text, QWidget *w, int msecDisplayTime)
#ifndef QT_NO_STYLE_STYLESHEET
    : QLabel(w, Qt::ToolTip | Qt::BypassGraphicsProxyWidget), styleSheetParent(0), widget(0)
#else
    : QLabel(w, Qt::ToolTip | Qt::BypassGraphicsProxyWidget), widget(0)
#endif
{
    delete instance;
    instance = this;
    setForegroundRole(QPalette::ToolTipText);
    setBackgroundRole(QPalette::ToolTipBase);
    setPalette(QToolTip::palette());
    ensurePolished();
    setMargin(1 + style()->pixelMetric(QStyle::PM_ToolTipLabelFrameWidth, 0, this));
    setFrameStyle(QFrame::NoFrame);
    setAlignment(Qt::AlignLeft);
    setIndent(1);
    qApp->installEventFilter(this);
    setWindowOpacity(style()->styleHint(QStyle::SH_ToolTipLabel_Opacity, 0, this) / 255.0);
    setMouseTracking(true);
    fadingOut = false;
    reuseTip(text, msecDisplayTime);
}

void QTipLabel::restartExpireTimer(int msecDisplayTime)
{
    int time = 10000 + 40 * qMax(0, text().length()-100);
    if (msecDisplayTime > 0)
        time = msecDisplayTime;
    expireTimer.start(time, this);
    hideTimer.stop();
}

void QTipLabel::reuseTip(const QString &text, int msecDisplayTime)
{
#ifndef QT_NO_STYLE_STYLESHEET
    if (styleSheetParent){
        disconnect(styleSheetParent, SIGNAL(destroyed()),
                   QTipLabel::instance, SLOT(styleSheetParentDestroyed()));
        styleSheetParent = 0;
    }
#endif

    setWordWrap(Qt::mightBeRichText(text));
    setText(text);
    QFontMetrics fm(font());
    QSize extra(1, 0);
    // Make it look good with the default ToolTip font on Mac, which has a small descent.
    if (fm.descent() == 2 && fm.ascent() >= 11)
        ++extra.rheight();
    resize(sizeHint() + extra);
    restartExpireTimer(msecDisplayTime);
}

void QTipLabel::paintEvent(QPaintEvent *ev)
{
    QStylePainter p(this);
    QStyleOptionFrame opt;
    opt.init(this);
    p.drawPrimitive(QStyle::PE_PanelTipLabel, opt);
    p.end();

    QLabel::paintEvent(ev);
}

void QTipLabel::resizeEvent(QResizeEvent *e)
{
    QStyleHintReturnMask frameMask;
    QStyleOption option;
    option.init(this);
    if (style()->styleHint(QStyle::SH_ToolTip_Mask, &option, this, &frameMask))
        setMask(frameMask.region);

    QLabel::resizeEvent(e);
}

void QTipLabel::mouseMoveEvent(QMouseEvent *e)
{
    if (rect.isNull())
        return;
    QPoint pos = e->globalPos();
    if (widget)
        pos = widget->mapFromGlobal(pos);
    if (!rect.contains(pos))
        hideTip();
    QLabel::mouseMoveEvent(e);
}

QTipLabel::~QTipLabel()
{
    instance = 0;
}

void QTipLabel::hideTip()
{
    if (!hideTimer.isActive())
        hideTimer.start(300, this);
}

void QTipLabel::hideTipImmediately()
{
    close(); // to trigger QEvent::Close which stops the animation
    deleteLater();
}

void QTipLabel::setTipRect(QWidget *w, const QRect &r)
{
    if (!r.isNull() && !w)
        qWarning("QToolTip::setTipRect: Cannot pass null widget if rect is set");
    else{
        widget = w;
        rect = r;
    }
}

void QTipLabel::timerEvent(QTimerEvent *e)
{
    if (e->timerId() == hideTimer.timerId()
        || e->timerId() == expireTimer.timerId()){
        hideTimer.stop();
        expireTimer.stop();
#if defined(Q_WS_MAC) && !defined(QT_NO_EFFECTS)
        if (QApplication::isEffectEnabled(Qt::UI_FadeTooltip)){
            // Fade out tip on mac (makes it invisible).
            // The tip will not be deleted until a new tip is shown.

                        // DRSWAT - Cocoa
                        macWindowFade(qt_mac_window_for(this));
            QTipLabel::instance->fadingOut = true; // will never be false again.
        }
        else
            hideTipImmediately();
#else
        hideTipImmediately();
#endif
    }
}

bool QTipLabel::eventFilter(QObject *o, QEvent *e)
{
    switch (e->type()) {
#ifdef Q_WS_MAC
    case QEvent::KeyPress:
    case QEvent::KeyRelease: {
        int key = static_cast<QKeyEvent *>(e)->key();
        Qt::KeyboardModifiers mody = static_cast<QKeyEvent *>(e)->modifiers();
        if (!(mody & Qt::KeyboardModifierMask)
            && key != Qt::Key_Shift && key != Qt::Key_Control
            && key != Qt::Key_Alt && key != Qt::Key_Meta)
            hideTip();
        break;
    }
#endif
    case QEvent::Leave:
        hideTip();
        break;


#if defined (Q_OS_QNX) // On QNX the window activate and focus events are delayed and will appear
                       // after the window is shown.
    case QEvent::WindowActivate:
    case QEvent::FocusIn:
        return false;
    case QEvent::WindowDeactivate:
        if (o != this)
            return false;
        hideTipImmediately();
        break;
    case QEvent::FocusOut:
        if (reinterpret_cast<QWindow*>(o) != windowHandle())
            return false;
        hideTipImmediately();
        break;
#else
    case QEvent::WindowActivate:
    case QEvent::WindowDeactivate:
    case QEvent::FocusIn:
    case QEvent::FocusOut:
#endif
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseButtonDblClick:
    case QEvent::Wheel:
        hideTipImmediately();
        break;

    case QEvent::MouseMove:
        if (o == widget && !rect.isNull() && !rect.contains(static_cast<QMouseEvent*>(e)->pos()))
            hideTip();
    default:
        break;
    }
    return false;
}

int QTipLabel::getTipScreen(const QPoint &pos, QWidget *w)
{
    if (QApplication::desktop()->isVirtualDesktop())
        return QApplication::desktop()->screenNumber(pos);
    else
        return QApplication::desktop()->screenNumber(w);
}

void QTipLabel::placeTip(const QPoint &pos, QWidget *w)
{
#ifndef QT_NO_STYLE_STYLESHEET
    if (testAttribute(Qt::WA_StyleSheet) || (w && qobject_cast<QStyleSheetStyle *>(w->style()))) {
        //the stylesheet need to know the real parent
        QTipLabel::instance->setProperty("_q_stylesheet_parent", QVariant::fromValue(w));
        //we force the style to be the QStyleSheetStyle, and force to clear the cache as well.
        QTipLabel::instance->setStyleSheet(QLatin1String("/* */"));

        // Set up for cleaning up this later...
        QTipLabel::instance->styleSheetParent = w;
        if (w) {
            connect(w, SIGNAL(destroyed()),
                QTipLabel::instance, SLOT(styleSheetParentDestroyed()));
        }
    }
#endif //QT_NO_STYLE_STYLESHEET


#ifdef Q_WS_MAC
    // When in full screen mode, there is no Dock nor Menu so we can use
    // the whole screen for displaying the tooltip. However when not in
    // full screen mode we need to save space for the dock, so we use
    // availableGeometry instead.
    extern bool qt_mac_app_fullscreen; //qapplication_mac.mm
    QRect screen;
    if(qt_mac_app_fullscreen)
        screen = QApplication::desktop()->screenGeometry(getTipScreen(pos, w));
    else
        screen = QApplication::desktop()->availableGeometry(getTipScreen(pos, w));
#else
    QRect screen = QApplication::desktop()->screenGeometry(getTipScreen(pos, w));
#endif

    QPoint p = pos;
    p += QPoint(2,
#ifdef Q_WS_WIN
                21
#else
                16
#endif
        );
    if (p.x() + this->width() > screen.x() + screen.width())
        p.rx() -= 4 + this->width();
    if (p.y() + this->height() > screen.y() + screen.height())
        p.ry() -= 24 + this->height();
    if (p.y() < screen.y())
        p.setY(screen.y());
    if (p.x() + this->width() > screen.x() + screen.width())
        p.setX(screen.x() + screen.width() - this->width());
    if (p.x() < screen.x())
        p.setX(screen.x());
    if (p.y() + this->height() > screen.y() + screen.height())
        p.setY(screen.y() + screen.height() - this->height());
    this->move(p);
}

bool QTipLabel::tipChanged(const QPoint &pos, const QString &text, QObject *o)
{
    if (QTipLabel::instance->text() != text)
        return true;

    if (o != widget)
        return true;

    if (!rect.isNull())
        return !rect.contains(pos);
    else
       return false;
}

/*!
    Shows \a text as a tool tip, with the global position \a pos as
    the point of interest. The tool tip will be shown with a platform
    specific offset from this point of interest.

    If you specify a non-empty rect the tip will be hidden as soon
    as you move your cursor out of this area.

    The \a rect is in the coordinates of the widget you specify with
    \a w. If the \a rect is not empty you must specify a widget.
    Otherwise this argument can be 0 but it is used to determine the
    appropriate screen on multi-head systems.

    If \a text is empty the tool tip is hidden. If the text is the
    same as the currently shown tooltip, the tip will \e not move.
    You can force moving by first hiding the tip with an empty text,
    and then showing the new tip at the new position.
*/

void QToolTip::showText(const QPoint &pos, const QString &text, QWidget *w, const QRect &rect)
{
    showText(pos, text, w, rect, -1);
}

/*!
   \since 5.2
   \overload
   This is similar to QToolTip::showText(\a pos, \a text, \a w, \a rect) but with an extra parameter \a msecDisplayTime
   that specifies how long the tool tip will be displayed, in milliseconds.
*/

void QToolTip::showText(const QPoint &pos, const QString &text, QWidget *w, const QRect &rect, int msecDisplayTime)
{
    if (QTipLabel::instance && QTipLabel::instance->isVisible()){ // a tip does already exist
        if (text.isEmpty()){ // empty text means hide current tip
            QTipLabel::instance->hideTip();
            return;
        }
        else if (!QTipLabel::instance->fadingOut){
            // If the tip has changed, reuse the one
            // that is showing (removes flickering)
            QPoint localPos = pos;
            if (w)
                localPos = w->mapFromGlobal(pos);
            if (QTipLabel::instance->tipChanged(localPos, text, w)){
                QTipLabel::instance->reuseTip(text, msecDisplayTime);
                QTipLabel::instance->setTipRect(w, rect);
                QTipLabel::instance->placeTip(pos, w);
            }
            return;
        }
    }

    if (!text.isEmpty()){ // no tip can be reused, create new tip:
#ifndef Q_WS_WIN
        new QTipLabel(text, w, msecDisplayTime); // sets QTipLabel::instance to itself
#else
        // On windows, we can't use the widget as parent otherwise the window will be
        // raised when the tooltip will be shown
        new QTipLabel(text, QApplication::desktop()->screen(QTipLabel::getTipScreen(pos, w)), msecDisplayTime);
#endif
        QTipLabel::instance->setTipRect(w, rect);
        QTipLabel::instance->placeTip(pos, w);
        QTipLabel::instance->setObjectName(QLatin1String("qtooltip_label"));


#if !defined(QT_NO_EFFECTS) && !defined(Q_WS_MAC)
        if (QApplication::isEffectEnabled(Qt::UI_FadeTooltip))
            qFadeEffect(QTipLabel::instance);
        else if (QApplication::isEffectEnabled(Qt::UI_AnimateTooltip))
            qScrollEffect(QTipLabel::instance);
        else
            QTipLabel::instance->showNormal();
#else
        QTipLabel::instance->showNormal();
#endif
    }
}

/*!
    \overload

    This is analogous to calling QToolTip::showText(\a pos, \a text, \a w, QRect())
*/

void QToolTip::showText(const QPoint &pos, const QString &text, QWidget *w)
{
    QToolTip::showText(pos, text, w, QRect());
}


/*!
    \fn void QToolTip::hideText()
    \since 4.2

    Hides the tool tip. This is the same as calling showText() with an
    empty string.

    \sa showText()
*/


/*!
  \since 4.4

  Returns \c true if this tooltip is currently shown.

  \sa showText()
 */
bool QToolTip::isVisible()
{
    return (QTipLabel::instance != 0 && QTipLabel::instance->isVisible());
}

/*!
  \since 4.4

  Returns the tooltip text, if a tooltip is visible, or an
  empty string if a tooltip is not visible.
 */
QString QToolTip::text()
{
    if (QTipLabel::instance)
        return QTipLabel::instance->text();
    return QString();
}


Q_GLOBAL_STATIC(QPalette, tooltip_palette)

/*!
    Returns the palette used to render tooltips.

    \note Tool tips use the inactive color group of QPalette, because tool
    tips are not active windows.
*/
QPalette QToolTip::palette()
{
    return *tooltip_palette();
}

/*!
    \since 4.2

    Returns the font used to render tooltips.
*/
QFont QToolTip::font()
{
    return QApplication::font("QTipLabel");
}

/*!
    \since 4.2

    Sets the \a palette used to render tooltips.

    \note Tool tips use the inactive color group of QPalette, because tool
    tips are not active windows.
*/
void QToolTip::setPalette(const QPalette &palette)
{
    *tooltip_palette() = palette;
    if (QTipLabel::instance)
        QTipLabel::instance->setPalette(palette);
}

/*!
    \since 4.2

    Sets the \a font used to render tooltips.
*/
void QToolTip::setFont(const QFont &font)
{
    QApplication::setFont(font, "QTipLabel");
}

QT_END_NAMESPACE

#include "qtooltip.moc"
#endif // QT_NO_TOOLTIP