summaryrefslogtreecommitdiffstats
path: root/tdehtml/rendering/render_canvas.cpp
blob: 862f374b267c7b9aab61c9deb8d195259eda83e6 (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
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
/**
 * This file is part of the HTML widget for KDE.
 *
 * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
 *           (C) 2003 Apple Computer, Inc.
 *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */


#include "rendering/render_canvas.h"
#include "rendering/render_layer.h"
#include "xml/dom_docimpl.h"

#include "tdehtmlview.h"
#include "tdehtml_part.h"
#include <kdebug.h>
#include <tdeglobal.h>

using namespace tdehtml;

//#define BOX_DEBUG
//#define SPEED_DEBUG

RenderCanvas::RenderCanvas(DOM::NodeImpl* node, TDEHTMLView *view)
    : RenderBlock(node)
{
    // init RenderObject attributes
    setInline(false);
    setIsAnonymous(false);

    m_view = view;
    // try to contrain the width to the views width

    m_minWidth = 0;
    m_height = 0;

    m_width = m_minWidth;
    m_maxWidth = m_minWidth;

    m_rootWidth = m_rootHeight = 0;
    m_viewportWidth = m_viewportHeight = 0;
    m_cachedDocWidth = m_cachedDocHeight = -1;

    setPositioned(true); // to 0,0 :)

    m_staticMode = false;
    m_pagedMode = false;
    m_printImages = true;

    m_pageTop = 0;
    m_pageBottom = 0;

    m_page = 0;

    m_maximalOutlineSize = 0;

    m_selectionStart = 0;
    m_selectionEnd = 0;
    m_selectionStartPos = -1;
    m_selectionEndPos = -1;

    m_needsWidgetMasks = false;

    // Create a new root layer for our layer hierarchy.
    m_layer = new (node->getDocument()->renderArena()) RenderLayer(this);
}

RenderCanvas::~RenderCanvas()
{
    delete m_page;
}

void RenderCanvas::setStyle(RenderStyle* style)
{
    /*
    if (m_pagedMode)
        style->setOverflow(OHIDDEN); */
    RenderBlock::setStyle(style);
}

void RenderCanvas::calcHeight()
{
    if (m_pagedMode || !m_view)
        m_height = m_rootHeight;
    else
        m_height = m_view->visibleHeight();
}

void RenderCanvas::calcWidth()
{
    // the width gets set by TDEHTMLView::print when printing to a printer.
    if(m_pagedMode || !m_view)
    {
        m_width = m_rootWidth;
        return;
    }

    m_width = m_view ? m_view->frameWidth() : m_minWidth;

    if (style()->marginLeft().isFixed())
        m_marginLeft = style()->marginLeft().value();
    else
        m_marginLeft = 0;

    if (style()->marginRight().isFixed())
        m_marginRight = style()->marginRight().value();
    else
        m_marginRight = 0;
}

void RenderCanvas::calcMinMaxWidth()
{
    TDEHTMLAssert( !minMaxKnown() );

    RenderBlock::calcMinMaxWidth();

    m_maxWidth = m_minWidth;

    setMinMaxKnown();
}

//#define SPEED_DEBUG

void RenderCanvas::layout()
{
    if (m_pagedMode) {
       m_minWidth = m_width;
//        m_maxWidth = m_width;
    }

    m_needsFullRepaint =  markedForRepaint() || !view() || view()->needsFullRepaint() || m_pagedMode;

    setChildNeedsLayout(true);
    setMinMaxKnown(false);
    for(RenderObject* c = firstChild(); c; c = c->nextSibling())
        c->setChildNeedsLayout(true);

    int oldWidth = m_width;
    int oldHeight = m_height;

    m_cachedDocWidth = m_cachedDocHeight = -1;

    if (m_pagedMode || !m_view) {
        m_width = m_rootWidth;
        m_height = m_rootHeight;
    }
    else
    {
        m_viewportWidth = m_width = m_view->visibleWidth();
        m_viewportHeight = m_height = m_view->visibleHeight();
    }

#ifdef SPEED_DEBUG
    TQTime qt;
    qt.start();
#endif

    if ( recalcMinMax() )
	recalcMinMaxWidths();

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::calcMinMax time used=" << qt.elapsed() << endl;
    qt.start();
#endif

    bool relayoutChildren = (oldWidth != m_width) || (oldHeight != m_height);

    RenderBlock::layoutBlock( relayoutChildren );

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::layout time used=" << qt.elapsed() << endl;
    qt.start();
#endif

    updateDocumentSize();

    layer()->updateLayerPositions( layer(), needsFullRepaint(), true );

    if (!m_pagedMode && m_needsWidgetMasks)
        layer()->updateWidgetMasks(layer());

    scheduleDeferredRepaints();
    setNeedsLayout(false);

#ifdef SPEED_DEBUG
    kdDebug() << "RenderCanvas::end time used=" << qt.elapsed() << endl;
#endif
}

void RenderCanvas::updateDocumentSize()
{
     // update our cached document size
    int hDocH = m_cachedDocHeight = docHeight();
    int hDocW = m_cachedDocWidth = docWidth();

    if (!m_pagedMode && m_view) {

        bool vss = m_view->verticalScrollBar()->isShown();
        bool hss = m_view->horizontalScrollBar()->isShown();
        TQSize s = m_view->viewportSize(m_cachedDocWidth, m_cachedDocHeight);

        // if we are about to show a scrollbar, and the document is sized to the viewport w or h,
        // then reserve the scrollbar space so that it doesn't trigger the _other_ scrollbar

        if (!vss && m_width - m_view->verticalScrollBar()->sizeHint().width() == s.width() &&
            m_cachedDocWidth <= m_width)
            hDocW = kMin( m_cachedDocWidth, s.width() );

        if (!hss && m_height - m_view->horizontalScrollBar()->sizeHint().height() == s.height() &&
            m_cachedDocHeight <= m_height)
            hDocH = kMin( m_cachedDocHeight, s.height() );

        // likewise, if a scrollbar is shown, and we have a cunning plan to turn it off,
        // think again if we are falling downright in the hysteresis zone

        if (vss && s.width() > m_cachedDocWidth && m_cachedDocWidth > m_view->visibleWidth())
            hDocW = s.width()+1;

        if (hss && s.height() > m_cachedDocHeight && m_cachedDocHeight > m_view->visibleHeight())
            hDocH = s.height()+1;

        m_view->resizeContents(hDocW, hDocH);

        setWidth( m_viewportWidth = s.width() );
        setHeight( m_viewportHeight = s.height() );
    }
    layer()->resize( kMax( m_cachedDocWidth,int( m_width ) ), kMax( m_cachedDocHeight,m_height ) );
}

void RenderCanvas::updateDocSizeAfterLayerTranslation( RenderObject* o, bool posXOffset, bool posYOffset )
{
    if (needsLayout())
        return;
    int rightmost, lowest;
    o->absolutePosition( rightmost, lowest );
    if (posXOffset) {
        rightmost += o->rightmostPosition(false, true);
        setCachedDocWidth( kMax(docWidth(), rightmost) );
    } else {
        setCachedDocWidth( -1 );
    }
    if (posYOffset) {
        lowest += o->lowestPosition(false, true);
        setCachedDocHeight( kMax(docHeight(), lowest) );
    } else {
        setCachedDocHeight( -1 );
    }
//    kdDebug() << " posXOffset: " << posXOffset << " posYOffset " << posYOffset << " m_cachedDocWidth  " <<  m_cachedDocWidth << " m_cachedDocHeight  " << m_cachedDocHeight << endl;
    updateDocumentSize();
}

bool RenderCanvas::needsFullRepaint() const
{
    return m_needsFullRepaint || m_pagedMode;
}

void RenderCanvas::repaintViewRectangle(int x, int y, int w, int h, bool asap)
{
  TDEHTMLAssert( view() );
  view()->scheduleRepaint( x, y, w, h, asap );
}

bool RenderCanvas::absolutePosition(int &xPos, int &yPos, bool f) const
{
    if ( f && m_pagedMode) {
        xPos = 0;
        yPos = m_pageTop;
    }
    else if ( f && m_view) {
        xPos = m_view->contentsX();
        yPos = m_view->contentsY();
    }
    else {
        xPos = yPos = 0;
    }
    return true;
}

void RenderCanvas::paint(PaintInfo& paintInfo, int _tx, int _ty)
{
#ifdef DEBUG_LAYOUT
    kdDebug( 6040 ) << renderName() << this << " ::paintObject() w/h = (" << width() << "/" << height() << ")" << endl;
#endif

    // 1. paint background, borders etc
    if(paintInfo.phase == PaintActionElementBackground) {
        paintBoxDecorations(paintInfo, _tx, _ty);
        return;
    }

    // 2. paint contents
    for( RenderObject *child = firstChild(); child; child=child->nextSibling())
        if(!child->layer() && !child->isFloating())
            child->paint(paintInfo, _tx, _ty);

    // 3. paint floats.
    if (paintInfo.phase == PaintActionFloat)
        paintFloats(paintInfo, _tx, _ty);

#ifdef BOX_DEBUG
    if (m_view)
    {
        _tx += m_view->contentsX();
        _ty += m_view->contentsY();
    }

    outlineBox(p, _tx, _ty);
#endif

}

void RenderCanvas::paintBoxDecorations(PaintInfo& paintInfo, int /*_tx*/, int /*_ty*/)
{
    if ((firstChild() && firstChild()->style()->visibility() == VISIBLE) || !view())
        return;

    paintInfo.p->fillRect(paintInfo.r, view()->palette().active().color(TQColorGroup::Base));
}

void RenderCanvas::repaintRectangle(int x, int y, int w, int h, Priority p, bool f)
{
    if (m_staticMode) return;
//    kdDebug( 6040 ) << "updating views contents (" << x << "/" << y << ") (" << w << "/" << h << ")" << endl;

    if (f && m_pagedMode) {
        y += m_pageTop;
    } else
    if ( f && m_view ) {
        x += m_view->contentsX();
        y += m_view->contentsY();
    }

    TQRect vr = viewRect();
    TQRect ur(x, y, w, h);

    if (m_view && ur.intersects(vr)) {

        if (p == RealtimePriority)
	// ### KWQ's updateContents has an additional parameter "now".
	// It's not clear what the difference between updateContents(...,true)
	// and repaintContents(...) is. As Qt doesn't have this, I'm leaving it out. (LS)
            m_view->updateContents(ur/*, true*/);
        else if (p == HighPriority)
            m_view->scheduleRepaint(x, y, w, h, true /*asap*/);
        else
            m_view->scheduleRepaint(x, y, w, h);
    }
}

void RenderCanvas::deferredRepaint( RenderObject* o )
{
    m_dirtyChildren.append( o );
}

void RenderCanvas::scheduleDeferredRepaints()
{
    if (!needsFullRepaint()) {
        TQValueList<RenderObject*>::const_iterator it;
        for ( it = m_dirtyChildren.begin(); it != m_dirtyChildren.end(); ++it )
            (*it)->repaint();
    }
    //kdDebug(6040) << "scheduled deferred repaints: " << m_dirtyChildren.count() << " needed full repaint: " << needsFullRepaint() << endl;
    m_dirtyChildren.clear();
}

void RenderCanvas::repaint(Priority p)
{
    if (m_view && !m_staticMode) {
        if (p == RealtimePriority) {
            //m_view->resizeContents(docWidth(), docHeight());
            m_view->unscheduleRepaint();
            if (needsLayout()) {
                m_view->scheduleRelayout();
                return;
            }
	    // ### same as in repaintRectangle
            m_view->updateContents(m_view->contentsX(), m_view->contentsY(),
                                   m_view->visibleWidth(), m_view->visibleHeight()/*, true*/);
        }
        else if (p == HighPriority)
            m_view->scheduleRepaint(m_view->contentsX(), m_view->contentsY(),
                                    m_view->visibleWidth(), m_view->visibleHeight(), true /*asap*/);
        else
            m_view->scheduleRepaint(m_view->contentsX(), m_view->contentsY(),
                                    m_view->visibleWidth(), m_view->visibleHeight());
    }
}

static TQRect enclosingPositionedRect (RenderObject *n)
{
    RenderObject *enclosingParent =  n->containingBlock();
    TQRect rect(0,0,0,0);
    if (enclosingParent) {
        int ox, oy;
        enclosingParent->absolutePosition(ox, oy);
        int off = 0;
        if (!enclosingParent->hasOverflowClip()) {
            ox += enclosingParent->overflowLeft();
            oy += enclosingParent->overflowTop();
        }
        rect.setX(ox);
        rect.setY(oy);
        rect.setWidth(enclosingParent->effectiveWidth());
        rect.setHeight(enclosingParent->effectiveHeight());
    }
    return rect;
}

TQRect RenderCanvas::selectionRect() const
{
    RenderObject *r = m_selectionStart;
    if (!r)
        return TQRect();

    TQRect selectionRect = enclosingPositionedRect(r);

    while (r && r != m_selectionEnd)
    {
        RenderObject* n;
        if ( !(n = r->firstChild()) ){
            if ( !(n = r->nextSibling()) )
            {
                n = r->parent();
                while (n && !n->nextSibling())
                    n = n->parent();
                if (n)
                    n = n->nextSibling();
            }
        }
        r = n;
        if (r) {
            selectionRect = selectionRect.unite(enclosingPositionedRect(r));
        }
    }

    return selectionRect;
}

void RenderCanvas::setSelection(RenderObject *s, int sp, RenderObject *e, int ep)
{
    // Check we got valid renderobjects. www.msnbc.com and clicking
    // around, to find the case where this happened.
    if ( !s || !e )
    {
        kdWarning(6040) << "RenderCanvas::setSelection() called with start=" << s << " end=" << e << endl;
        return;
    }
//     kdDebug( 6040 ) << "RenderCanvas::setSelection(" << s << "," << sp << "," << e << "," << ep << ")" << endl;

    bool changedSelectionBorder = ( s != m_selectionStart || e != m_selectionEnd );

    // Cut out early if the selection hasn't changed.
    if ( !changedSelectionBorder && m_selectionStartPos == sp && m_selectionEndPos == ep )
        return;

    // Record the old selected objects.  Will be used later
    // to delta against the selected objects.

    RenderObject *oldStart = m_selectionStart;
    int oldStartPos = m_selectionStartPos;
    RenderObject *oldEnd = m_selectionEnd;
    int oldEndPos = m_selectionEndPos;
    TQPtrList<RenderObject> oldSelectedInside;
    TQPtrList<RenderObject> newSelectedInside;
    RenderObject *os = oldStart;

    while (os && os != oldEnd)
    {
        RenderObject* no;
        if ( !(no = os->firstChild()) ){
            if ( !(no = os->nextSibling()) )
            {
                no = os->parent();
                while (no && !no->nextSibling())
                    no = no->parent();
                if (no)
                    no = no->nextSibling();
            }
        }
        if (os->selectionState() == SelectionInside && !oldSelectedInside.containsRef(os))
            oldSelectedInside.append(os);

        os = no;
    }
    if (changedSelectionBorder)
        clearSelection(false);

    while (s->firstChild())
        s = s->firstChild();
    while (e->lastChild())
        e = e->lastChild();

#if 0
    bool changedSelectionBorder = ( s != m_selectionStart || e != m_selectionEnd );

    if ( !changedSelectionBorder && m_selectionStartPos == sp && m_selectionEndPos = ep )
        return;
#endif

    // set selection start
    if (m_selectionStart)
        m_selectionStart->setIsSelectionBorder(false);
    m_selectionStart = s;
    if (m_selectionStart)
        m_selectionStart->setIsSelectionBorder(true);
    m_selectionStartPos = sp;

    // set selection end
    if (m_selectionEnd)
        m_selectionEnd->setIsSelectionBorder(false);
    m_selectionEnd = e;
    if (m_selectionEnd)
        m_selectionEnd->setIsSelectionBorder(true);
    m_selectionEndPos = ep;

#if 0
    kdDebug( 6040 ) << "old selection (" << oldStart << "," << oldStartPos << "," << oldEnd << "," << oldEndPos << ")" << endl;
    kdDebug( 6040 ) << "new selection (" << s << "," << sp << "," << e << "," << ep << ")" << endl;
#endif

    // update selection status of all objects between m_selectionStart and m_selectionEnd
    RenderObject* o = s;

    while (o && o!=e)
    {
        o->setSelectionState(SelectionInside);
//      kdDebug( 6040 ) << "setting selected " << o << ", " << o->isText() << endl;
        RenderObject* no;
        if ( !(no = o->firstChild()) )
            if ( !(no = o->nextSibling()) )
            {
                no = o->parent();
                while (no && !no->nextSibling())
                    no = no->parent();
                if (no)
                    no = no->nextSibling();
            }
        if (o->selectionState() == SelectionInside && !newSelectedInside.containsRef(o))
            newSelectedInside.append(o);

        o=no;
    }
    s->setSelectionState(SelectionStart);
    e->setSelectionState(SelectionEnd);
    if(s == e) s->setSelectionState(SelectionBoth);

    if (!m_view)
        return;

    newSelectedInside.removeRef(s);
    newSelectedInside.removeRef(e);

    TQRect updateRect;

    // Don't use repaint() because it will cause all rects to
    // be united (see tdehtmlview::scheduleRepaint()).  Instead
    // just draw damage rects for objects that have a change
    // in selection state.
    // ### for Qt, updateContents will unite them, too. This has to be
    // circumvented somehow (LS)

    // Are any of the old fully selected objects not in the new selection?
    // If so we have to draw them.
    // Could be faster by building list of non-intersecting rectangles rather
    // than unioning rectangles.
    TQPtrListIterator<RenderObject> oldIterator(oldSelectedInside);
    bool firstRect = true;
    for (; oldIterator.current(); ++oldIterator){
        if (!newSelectedInside.containsRef(oldIterator.current())){
            if (firstRect){
                updateRect = enclosingPositionedRect(oldIterator.current());
                firstRect = false;
            }
            else
                updateRect = updateRect.unite(enclosingPositionedRect(oldIterator.current()));
        }
    }
    if (!firstRect){
        m_view->updateContents( updateRect );
    }

    // Are any of the new fully selected objects not in the previous selection?
    // If so we have to draw them.
    // Could be faster by building list of non-intersecting rectangles rather
    // than unioning rectangles.
    TQPtrListIterator<RenderObject> newIterator(newSelectedInside);
    firstRect = true;
    for (; newIterator.current(); ++newIterator){
        if (!oldSelectedInside.containsRef(newIterator.current())){
            if (firstRect){
                updateRect = enclosingPositionedRect(newIterator.current());
                firstRect = false;
            }
            else
                updateRect = updateRect.unite(enclosingPositionedRect(newIterator.current()));
        }
    }
    if (!firstRect) {
        m_view->updateContents( updateRect );
    }

    // Is the new starting object different, or did the position in the starting
    // element change?  If so we have to draw it.
    if (oldStart != m_selectionStart ||
        (oldStart == oldEnd && (oldStartPos != m_selectionStartPos || oldEndPos != m_selectionEndPos)) ||
        (oldStart == m_selectionStart && oldStartPos != m_selectionStartPos)){
        m_view->updateContents( enclosingPositionedRect(m_selectionStart) );
    }

    // Draw the old selection start object if it's different than the new selection
    // start object.
    if (oldStart && oldStart != m_selectionStart){
        m_view->updateContents( enclosingPositionedRect(oldStart) );
    }

    // Does the selection span objects and is the new end object different, or did the position
    // in the end element change?  If so we have to draw it.
    if (/*(oldStart != oldEnd || !oldEnd) &&*/
        (oldEnd != m_selectionEnd ||
        (oldEnd == m_selectionEnd && oldEndPos != m_selectionEndPos))){
        m_view->updateContents( enclosingPositionedRect(m_selectionEnd) );
    }

    // Draw the old selection end object if it's different than the new selection
    // end object.
    if (oldEnd && oldEnd != m_selectionEnd){
        m_view->updateContents( enclosingPositionedRect(oldEnd) );
    }
}

void RenderCanvas::clearSelection(bool doRepaint)
{
    // update selection status of all objects between m_selectionStart and m_selectionEnd
    RenderObject* o = m_selectionStart;
    while (o && o!=m_selectionEnd)
    {
        if (o->selectionState()!=SelectionNone)
            if (doRepaint)
                o->repaint();
        o->setSelectionState(SelectionNone);
        o->repaint();
        RenderObject* no;
        if ( !(no = o->firstChild()) )
            if ( !(no = o->nextSibling()) )
            {
                no = o->parent();
                while (no && !no->nextSibling())
                    no = no->parent();
                if (no)
                    no = no->nextSibling();
            }
        o=no;
    }
    if (m_selectionEnd) {
        m_selectionEnd->setSelectionState(SelectionNone);
        if (doRepaint)
            m_selectionEnd->repaint();
    }

    // set selection start & end to 0
    if (m_selectionStart)
        m_selectionStart->setIsSelectionBorder(false);
    m_selectionStart = 0;
    m_selectionStartPos = -1;

    if (m_selectionEnd)
        m_selectionEnd->setIsSelectionBorder(false);
    m_selectionEnd = 0;
    m_selectionEndPos = -1;
}

void RenderCanvas::selectionStartEnd(int& spos, int& epos)
{
    spos = m_selectionStartPos;
    epos = m_selectionEndPos;
}

TQRect RenderCanvas::viewRect() const
{
    if (m_pagedMode)
        if (m_pageTop == m_pageBottom) {
            kdDebug(6040) << "viewRect: " << TQRect(0, m_pageTop, m_width, m_height) << endl;
            return TQRect(0, m_pageTop, m_width, m_height);
        }
        else {
            kdDebug(6040) << "viewRect: " << TQRect(0, m_pageTop, m_width, m_pageBottom - m_pageTop) << endl;
            return TQRect(0, m_pageTop, m_width, m_pageBottom - m_pageTop);
        }
    else if (m_view)
        return TQRect(m_view->contentsX(),
            m_view->contentsY(),
            m_view->visibleWidth(),
            m_view->visibleHeight());
    else
        return TQRect(0,0,m_rootWidth,m_rootHeight);
}

int RenderCanvas::docHeight() const
{
    if (m_cachedDocHeight != -1)
        return m_cachedDocHeight;

    int h;
    if (m_pagedMode || !m_view)
        h = m_height;
    else
        h = 0;

    RenderObject *fc = firstChild();
    if(fc) {
        int dh = fc->overflowHeight() + fc->marginTop() + fc->marginBottom();
        int lowestPos = fc->lowestPosition(false);
// kdDebug(6040) << "h " << h << " lowestPos " << lowestPos << " dh " << dh << " fc->rh " << fc->effectiveHeight() << " fc->height() " << fc->height() << endl;
        if( lowestPos > dh )
            dh = lowestPos;
        lowestPos = lowestAbsolutePosition();
        if( lowestPos > dh )
            dh = lowestPos;
        if( dh > h )
            h = dh;
    }

    RenderLayer *layer = m_layer;
    h = kMax( h, layer->yPos() + layer->height() );
// kdDebug(6040) << "h " << h << " layer(" << layer->renderer()->renderName() << "@" << layer->renderer() << ")->height " << layer->height() << " lp " << (layer->yPos() + layer->height()) << " height() " << layer->renderer()->height() << " rh " << layer->renderer()->effectiveHeight() << endl;
    return h;
}

int RenderCanvas::docWidth() const
{
    if (m_cachedDocWidth != -1)
        return m_cachedDocWidth;

    int w;
    if (m_pagedMode || !m_view)
        w = m_width;
    else
        w = 0;

    RenderObject *fc = firstChild();
    if(fc) {
        // ow: like effectiveWidth() but without the negative
        const int ow = fc->hasOverflowClip() ? fc->width() : fc->overflowWidth();
        int dw = ow + fc->marginLeft() + fc->marginRight();
        int rightmostPos = fc->rightmostPosition(false);
// kdDebug(6040) << "w " << w << " rightmostPos " << rightmostPos << " dw " << dw << " fc->rw " << fc->effectiveWidth() << " fc->width() " << fc->width() << endl;
        if( rightmostPos > dw )
            dw = rightmostPos;
        rightmostPos = rightmostAbsolutePosition();
        if ( rightmostPos > dw )
            dw = rightmostPos;
        if( dw > w )
            w = dw;
    }

    RenderLayer *layer = m_layer;
    w = kMax( w, layer->xPos() + layer->width() );
// kdDebug(6040) << "w " << w << " layer(" << layer->renderer()->renderName() << ")->width " << layer->width() << " rm " << (layer->xPos() + layer->width()) << " width() " << layer->renderer()->width() << " rw " << layer->renderer()->effectiveWidth() << endl;
    return w;
}

RenderPage* RenderCanvas::page() {
    if (!m_page) m_page = new RenderPage(this);
    return m_page;
}