summaryrefslogtreecommitdiffstats
path: root/src/gui/widgets/qframe.cpp
blob: a7861ada5161d3ff40822ffbc8f98d0aac9f1539 (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
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** 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 either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qframe.h"
#include "qbitmap.h"
#include "qdrawutil.h"
#include "qevent.h"
#include "qpainter.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qapplication.h"

#include "qframe_p.h"

QT_BEGIN_NAMESPACE

QFramePrivate::QFramePrivate()
    : frect(QRect(0, 0, 0, 0)),
      frameStyle(QFrame::NoFrame | QFrame::Plain),
      lineWidth(1),
      midLineWidth(0),
      frameWidth(0),
      leftFrameWidth(0), rightFrameWidth(0),
      topFrameWidth(0), bottomFrameWidth(0)
{
}

inline void QFramePrivate::init()
{
    setLayoutItemMargins(QStyle::SE_FrameLayoutItem);
}

/*!
    \class QFrame
    \brief The QFrame class is the base class of widgets that can have a frame.

    \ingroup abstractwidgets
    \mainclass

    QMenu uses this to "raise" the menu above the surrounding
    screen. QProgressBar has a "sunken" look. QLabel has a flat look.
    The frames of widgets like these can be changed.

    \snippet doc/src/snippets/code/src_gui_widgets_qframe.cpp 0

    The QFrame class can also be used directly for creating simple
    placeholder frames without any contents.

    The frame style is specified by a \l{QFrame::Shape}{frame shape} and
    a \l{QFrame::Shadow}{shadow style} that is used to visually separate
    the frame from surrounding widgets. These properties can be set
    together using the setFrameStyle() function and read with frameStyle().

    The frame shapes are \l NoFrame, \l Box, \l Panel, \l StyledPanel,
    HLine and \l VLine; the shadow styles are \l Plain, \l Raised and
    \l Sunken.

    A frame widget has three attributes that describe the thickness of the
    border: \l lineWidth, \l midLineWidth, and \l frameWidth.

    \list
    \o The line width is the width of the frame border. It can be modified
       to customize the frame's appearance.

    \o The mid-line width specifies the width of an extra line in the
       middle of the frame, which uses a third color to obtain a special
       3D effect. Notice that a mid-line is only drawn for \l Box, \l
       HLine and \l VLine frames that are raised or sunken.

    \o The frame width is determined by the frame style, and the frameWidth()
       function is used to obtain the value defined for the style used.
    \endlist

    The margin between the frame and the contents of the frame can be
    customized with the QWidget::setContentsMargins() function.

    \target picture
    This table shows some of the combinations of styles and line widths:

    \image frames.png Table of frame styles
*/


/*!
    \enum QFrame::Shape

    This enum type defines the shapes of frame available.

    \value NoFrame  QFrame draws nothing
    \value Box  QFrame draws a box around its contents
    \value Panel  QFrame draws a panel to make the contents appear
    raised or sunken
    \value StyledPanel  draws a rectangular panel with a look that
    depends on the current GUI style. It can be raised or sunken.
    \value HLine  QFrame draws a horizontal line that frames nothing
    (useful as separator)
    \value VLine  QFrame draws a vertical line that frames nothing
    (useful as separator)
    \value WinPanel draws a rectangular panel that can be raised or
    sunken like those in Windows 2000. Specifying this shape sets
    the line width to 2 pixels. WinPanel is provided for compatibility.
    For GUI style independence we recommend using StyledPanel instead.

    \omitvalue GroupBoxPanel
    \omitvalue ToolBarPanel
    \omitvalue MenuBarPanel
    \omitvalue PopupPanel
    \omitvalue LineEditPanel
    \omitvalue TabWidgetPanel

    When it does not call QStyle, Shape interacts with QFrame::Shadow,
    the lineWidth() and the midLineWidth() to create the total result.
    See the picture of the frames in the main class documentation.

    \sa QFrame::Shadow QFrame::style() QStyle::drawPrimitive()
*/


/*!
    \enum QFrame::Shadow

    This enum type defines the types of shadow that are used to give
    a 3D effect to frames.

    \value Plain  the frame and contents appear level with the
    surroundings; draws using the palette QPalette::WindowText color
    (without any 3D effect)

    \value Raised the frame and contents appear raised; draws a 3D
    raised line using the light and dark colors of the current color
    group
    \value Sunken the frame and contents appear sunken; draws a 3D
    sunken line using the light and dark colors of the current color
    group

    Shadow interacts with QFrame::Shape, the lineWidth() and the
    midLineWidth(). See the picture of the frames in the main class
    documentation.

    \sa QFrame::Shape lineWidth() midLineWidth()
*/

/*!
    \enum QFrame::StyleMask

    This enum defines two constants that can be used to extract the
    two components of frameStyle():

    \value Shadow_Mask The \l Shadow part of frameStyle()
    \value Shape_Mask  The \l Shape part of frameStyle()

    \omitvalue MShadow
    \omitvalue MShape

    Normally, you don't need to use these, since frameShadow() and
    frameShape() already extract the \l Shadow and the \l Shape parts
    of frameStyle().

    \sa frameStyle(), setFrameStyle()
*/

/*!
    Constructs a frame widget with frame style \l NoFrame and a
    1-pixel frame width.

    The \a parent and \a f arguments are passed to the QWidget
    constructor.
*/

QFrame::QFrame(QWidget* parent, Qt::WindowFlags f)
    : QWidget(*new QFramePrivate, parent, f)
{
    Q_D(QFrame);
    d->init();
}

/*! \internal */
QFrame::QFrame(QFramePrivate &dd, QWidget* parent, Qt::WindowFlags f)
    : QWidget(dd, parent, f)
{
    Q_D(QFrame);
    d->init();
}

#ifdef QT3_SUPPORT
/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QFrame::QFrame(QWidget *parent, const char *name, Qt::WindowFlags f)
    : QWidget(*new QFramePrivate, parent, f)
{
    Q_D(QFrame);
    setObjectName(QString::fromAscii(name));
    d->init();
}
#endif

/*!
  Destroys the frame.
 */
QFrame::~QFrame()
{
}

/*!
    Returns the frame style.

    The default value is QFrame::NoFrame.

    \sa setFrameStyle(), frameShape(), frameShadow()
*/
int QFrame::frameStyle() const
{
    Q_D(const QFrame);
    return d->frameStyle;
}

/*!
    \property QFrame::frameShape
    \brief the frame shape value from the frame style

    \sa frameStyle(), frameShadow()
*/

QFrame::Shape QFrame::frameShape() const
{
    Q_D(const QFrame);
    return (Shape) (d->frameStyle & Shape_Mask);
}

void QFrame::setFrameShape(QFrame::Shape s)
{
    Q_D(QFrame);
    setFrameStyle((d->frameStyle & Shadow_Mask) | s);
}


/*!
    \property QFrame::frameShadow
    \brief the frame shadow value from the frame style

    \sa frameStyle(), frameShape()
*/
QFrame::Shadow QFrame::frameShadow() const
{
    Q_D(const QFrame);
    return (Shadow) (d->frameStyle & Shadow_Mask);
}

void QFrame::setFrameShadow(QFrame::Shadow s)
{
    Q_D(QFrame);
    setFrameStyle((d->frameStyle & Shape_Mask) | s);
}

/*!
    Sets the frame style to \a style.

    The \a style is the bitwise OR between a frame shape and a frame
    shadow style. See the picture of the frames in the main class
    documentation.

    The frame shapes are given in \l{QFrame::Shape} and the shadow
    styles in \l{QFrame::Shadow}.

    If a mid-line width greater than 0 is specified, an additional
    line is drawn for \l Raised or \l Sunken \l Box, \l HLine, and \l
    VLine frames. The mid-color of the current color group is used for
    drawing middle lines.

    \sa frameStyle()
*/

void QFrame::setFrameStyle(int style)
{
    Q_D(QFrame);
    if (!testAttribute(Qt::WA_WState_OwnSizePolicy)) {
        QSizePolicy sp;

        switch (style & Shape_Mask) {
        case HLine:
            sp = QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed, QSizePolicy::Line);
            break;
        case VLine:
            sp = QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum, QSizePolicy::Line);
            break;
        default:
            sp = QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::Frame);
        }
        setSizePolicy(sp);
        setAttribute(Qt::WA_WState_OwnSizePolicy, false);
    }
    d->frameStyle = (short)style;
    update();
    d->updateFrameWidth();
}

/*!
    \property QFrame::lineWidth
    \brief the line width

    Note that the \e total line width for frames used as separators
    (\l HLine and \l VLine) is specified by \l frameWidth.

    The default value is 1.

    \sa midLineWidth, frameWidth
*/

void QFrame::setLineWidth(int w)
{
    Q_D(QFrame);
    if (short(w) == d->lineWidth)
        return;
    d->lineWidth = short(w);
    d->updateFrameWidth();
}

int QFrame::lineWidth() const
{
    Q_D(const QFrame);
    return d->lineWidth;
}

/*!
    \property QFrame::midLineWidth
    \brief the width of the mid-line

    The default value is 0.

    \sa lineWidth, frameWidth
*/

void QFrame::setMidLineWidth(int w)
{
    Q_D(QFrame);
    if (short(w) == d->midLineWidth)
        return;
    d->midLineWidth = short(w);
    d->updateFrameWidth();
}

int QFrame::midLineWidth() const
{
    Q_D(const QFrame);
    return d->midLineWidth;
}

/*!
  \internal
  Updates the frame widths from the style.
*/
void QFramePrivate::updateStyledFrameWidths()
{
    Q_Q(const QFrame);
    QStyleOptionFrameV3 opt;
    opt.initFrom(q);
    opt.lineWidth = lineWidth;
    opt.midLineWidth = midLineWidth;
    opt.frameShape = QFrame::Shape(frameStyle & QFrame::Shape_Mask);

    QRect cr = q->style()->subElementRect(QStyle::SE_ShapedFrameContents, &opt, q);
    leftFrameWidth = cr.left() - opt.rect.left();
    topFrameWidth = cr.top() - opt.rect.top();
    rightFrameWidth = opt.rect.right() - cr.right(),
    bottomFrameWidth = opt.rect.bottom() - cr.bottom();
    frameWidth = qMax(qMax(leftFrameWidth, rightFrameWidth),
                      qMax(topFrameWidth, bottomFrameWidth));
}

/*!
  \internal
  Updated the frameWidth parameter.
*/

void QFramePrivate::updateFrameWidth()
{
    Q_Q(QFrame);
    QRect fr = q->frameRect();
    updateStyledFrameWidths();
    q->setFrameRect(fr);
    setLayoutItemMargins(QStyle::SE_FrameLayoutItem);
}

/*!
    \property QFrame::frameWidth
    \brief the width of the frame that is drawn.

    Note that the frame width depends on the \l{QFrame::setFrameStyle()}{frame style},
    not only the line width and the mid-line width. For example, the style specified
    by \l NoFrame always has a frame width of 0, whereas the style \l Panel has a
    frame width equivalent to the line width.

    \sa lineWidth(), midLineWidth(), frameStyle()
*/
int QFrame::frameWidth() const
{
    Q_D(const QFrame);
    return d->frameWidth;
}


/*!
    \property QFrame::frameRect
    \brief the frame's rectangle

    The frame's rectangle is the rectangle the frame is drawn in. By
    default, this is the entire widget. Setting the rectangle does
    does \e not cause a widget update. The frame rectangle is
    automatically adjusted when the widget changes size.

    If you set the rectangle to a null rectangle (for example,
    QRect(0, 0, 0, 0)), then the resulting frame rectangle is
    equivalent to the \link QWidget::rect() widget rectangle\endlink.
*/

QRect QFrame::frameRect() const
{
    Q_D(const QFrame);
    QRect fr = contentsRect();
    fr.adjust(-d->leftFrameWidth, -d->topFrameWidth, d->rightFrameWidth, d->bottomFrameWidth);
    return fr;
}

void QFrame::setFrameRect(const QRect &r)
{
    Q_D(QFrame);
    QRect cr = r.isValid() ? r : rect();
    cr.adjust(d->leftFrameWidth, d->topFrameWidth, -d->rightFrameWidth, -d->bottomFrameWidth);
    setContentsMargins(cr.left(), cr.top(), rect().right() - cr.right(), rect().bottom() - cr.bottom());
}

/*!\reimp
*/
QSize QFrame::sizeHint() const
{
    Q_D(const QFrame);
    //   Returns a size hint for the frame - for HLine and VLine
    //   shapes, this is stretchable one way and 3 pixels wide the
    //   other.  For other shapes, QWidget::sizeHint() is used.
    switch (d->frameStyle & Shape_Mask) {
    case HLine:
        return QSize(-1,3);
    case VLine:
        return QSize(3,-1);
    default:
        return QWidget::sizeHint();
    }
}

/*!\reimp
*/

void QFrame::paintEvent(QPaintEvent *)
{
    QPainter paint(this);
    drawFrame(&paint);
}

/*!
    \internal

    Mostly for the sake of Q3Frame
 */
void QFrame::drawFrame(QPainter *p)
{
    Q_D(QFrame);
    QStyleOptionFrameV3 opt;
    opt.init(this);
    int frameShape  = d->frameStyle & QFrame::Shape_Mask;
    int frameShadow = d->frameStyle & QFrame::Shadow_Mask;
    opt.frameShape = Shape(int(opt.frameShape) | frameShape);
    opt.rect = frameRect();
    switch (frameShape) {
        case QFrame::Box:
        case QFrame::HLine:
        case QFrame::VLine:
        case QFrame::StyledPanel:
        case QFrame::Panel:
            opt.lineWidth = d->lineWidth;
            opt.midLineWidth = d->midLineWidth;
            break;
        default:
            // most frame styles do not handle customized line and midline widths
            // (see updateFrameWidth()).
            opt.lineWidth = d->frameWidth;
            break;
    }

    if (frameShadow == Sunken)
        opt.state |= QStyle::State_Sunken;
    else if (frameShadow == Raised)
        opt.state |= QStyle::State_Raised;

    style()->drawControl(QStyle::CE_ShapedFrame, &opt, p, this);
}


/*!\reimp
 */
void QFrame::changeEvent(QEvent *ev)
{
    Q_D(QFrame);
    if (ev->type() == QEvent::StyleChange
#ifdef Q_WS_MAC
            || ev->type() == QEvent::MacSizeChange
#endif
            )
        d->updateFrameWidth();
    QWidget::changeEvent(ev);
}

/*! \reimp */
bool QFrame::event(QEvent *e)
{
    if (e->type() == QEvent::ParentChange)
        d_func()->updateFrameWidth();
    bool result = QWidget::event(e);
    //this has to be done after the widget has been polished
    if (e->type() == QEvent::Polish)
        d_func()->updateFrameWidth();
    return result;
}

QT_END_NAMESPACE