summaryrefslogtreecommitdiffstats
path: root/kviewshell/pageView.cpp
blob: 81c0c8b2c9ff94c1d0d28c33066ad373736f4470 (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
/* This file is part of the KDE project
   Copyright (C) 2001 Wilco Greven <greven@kde.org>
   Copyright (C) 2002-2004 Stefan Kebekus <kebekus@kde.org>
   Copyright (C) 2004-2005 Wilfried Huss <Wilfried.Huss@gmx.at>

   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 <config.h>

#include <kdebug.h>
#include <tqcursor.h>
#include <tqpainter.h>
#include <tqrect.h>
#include <math.h>

#include "pageView.h"
#include "pageNumber.h"

PageView::PageView( TQWidget* parent, const char* name )
  : TQScrollView( parent, name, WStaticContents | WNoAutoErase)
{
  moveTool = true;

  widgetList = 0;
  viewport()->setFocusPolicy(TQ_StrongFocus);

  setResizePolicy(TQScrollView::Manual);

  setVScrollBarMode(TQScrollView::Auto);
  setHScrollBarMode(TQScrollView::Auto);

  viewport()->setBackgroundMode(TQt::NoBackground);

  setResizePolicy(Manual);
  setDragAutoScroll(false);

  enableClipper(true);
  nrCols = 1;
  nrRows = 1;
  continuousViewmode = true;
  fullScreen = false;

  connect(this, TQT_SIGNAL(contentsMoving(int, int)), this, TQT_SLOT(calculateCurrentPageNumber(int, int)));
}


void PageView::addChild( TQPtrVector<DocumentWidget> *wdgList )
{
  if( wdgList == 0 ) {
    kdError(1223) << "PageView::addChild(...) called with invalid arguments" << endl;
    return;
  }

  widgetList = wdgList;
  layoutPages();
}


bool PageView::atTop() const
{
  return verticalScrollBar()->value() == verticalScrollBar()->minValue();
}


bool PageView::atBottom() const 
{
  return verticalScrollBar()->value() == verticalScrollBar()->maxValue();
}


bool PageView::readUp()
{
  if( atTop() )
    return false;
  else {
    // Coordinate of the top of the viewport
    int top = contentsY();

    DocumentWidget* widget = 0;
    // Find the widget(s) that intersect the top of the viewport
    // TODO: It would be better to use a binary search.
    for(TQ_UINT16 i=0; i<widgetList->size(); i++)
    {
      widget = widgetList->at(i);
      if (childY(widget) < top && childY(widget) + widget->height() > top)
      {
        // Draw scrollguide
        widget->drawScrollGuide(top - childY(widget));
      }
    }

    int newValue = TQMAX( verticalScrollBar()->value() - (int)(height() * 0.9),
                         verticalScrollBar()->minValue() );
    verticalScrollBar()->setValue( newValue );
    return true;
  }
}


bool PageView::readDown()
{
  if( atBottom() )
    return false;
  else {
    // Coordinate of the bottom of the viewport
    int bottom = contentsY() + visibleHeight();

    DocumentWidget* widget = 0;
    // Find the widget(s) that intersect the bottom of the viewport
    // TODO: It would be better to use a binary search.
    for(TQ_UINT16 i=0; i<widgetList->size(); i++)
    {
      widget = widgetList->at(i);
      if (childY(widget) < bottom && childY(widget) + widget->height() > bottom)
      {
        // Draw scrollguide
        widget->drawScrollGuide(bottom - childY(widget));
      }
    }

    int newValue = TQMIN( verticalScrollBar()->value() + (int)(height() * 0.9),
                         verticalScrollBar()->maxValue() );
    verticalScrollBar()->setValue( newValue );

    return true;
  }
}


void PageView::scrollRight()
{
  horizontalScrollBar()->addLine();
}

void PageView::scrollLeft()
{
  horizontalScrollBar()->subtractLine();
}

void PageView::scrollDown()
{
  verticalScrollBar()->addLine();
}

void PageView::scrollUp()
{
  verticalScrollBar()->subtractLine();
}

void PageView::scrollBottom()
{
  verticalScrollBar()->setValue( verticalScrollBar()->maxValue() );
}

void PageView::scrollTop()
{
  verticalScrollBar()->setValue( verticalScrollBar()->minValue() );
}

void PageView::keyPressEvent( TQKeyEvent* e )
{
  switch ( e->key() ) {
    case Key_Up:
      scrollUp();
      break;
    case Key_Down:
      scrollDown();
      break;
    case Key_Left:
      scrollLeft();
      break;
    case Key_Right:
      scrollRight();
      break;
    default:
      e->ignore();
      return;
  }
  e->accept();
}

void PageView::contentsMousePressEvent( TQMouseEvent* e )
{
  if (e->button() == Qt::LeftButton)
  {
    if (moveTool)
    {
      setCursor(TQt::SizeAllCursor);
      dragGrabPos = e->globalPos();
    }
    else
    {
      // we are in selection mode
    }
  }
  else
  {
    setCursor(TQt::arrowCursor);
  }
}

void PageView::contentsMouseReleaseEvent( TQMouseEvent* )
{
  setCursor(TQt::arrowCursor);
}

void PageView::contentsMouseMoveEvent( TQMouseEvent* e )
{
  TQPoint newPos = e->globalPos();

  if (e->state() == Qt::LeftButton && moveTool)
  {
    TQPoint delta = dragGrabPos - newPos;
    scrollBy(delta.x(), delta.y());
  }
  dragGrabPos = newPos;
}

void PageView::viewportResizeEvent( TQResizeEvent* e )
{
  TQScrollView::viewportResizeEvent( e );

  if (!widgetList)
    return;

  layoutPages();

  emit viewSizeChanged( viewport()->size() );
}

void PageView::setNrColumns( TQ_UINT8 cols )
{
  nrCols = cols;
}

void PageView::setNrRows( TQ_UINT8 rows )
{
  nrRows = rows;
}

void PageView::setContinuousViewMode(bool continuous)
{
  continuousViewmode = continuous;
}

bool PageView::singlePageFullScreenMode()
{
  return (nrCols == 1 && nrRows == 1 && !continuousViewmode && fullScreen);
}

void PageView::slotShowScrollbars(bool status)
{
  if (status == true) {
    setVScrollBarMode(TQScrollView::Auto);
    setHScrollBarMode(TQScrollView::Auto);
  } else {
    setVScrollBarMode(TQScrollView::AlwaysOff);
    setHScrollBarMode(TQScrollView::AlwaysOff);
  }
}

void PageView::setFullScreenMode(bool fullScreen)
{
  this -> fullScreen = fullScreen;
  if (fullScreen == true) 
  {
    setVScrollBarMode(TQScrollView::AlwaysOff);
    setHScrollBarMode(TQScrollView::AlwaysOff);
    oldFrameStyle = frameStyle();
    setFrameStyle(TQFrame::NoFrame);
    backgroundColor = viewport()->paletteBackgroundColor();
    if (singlePageFullScreenMode())
    {
      viewport()->setPaletteBackgroundColor( TQt::black ) ;
    }
  }
  else
  {
    viewport()->setPaletteBackgroundColor( backgroundColor ) ;
    setFrameStyle(oldFrameStyle);
  }
}

void PageView::layoutPages(bool zoomChanged)
{
  // Paranoid safety check
  if (widgetList == 0)
    return;

  // If there are no widgets, e.g. because the last widget has been
  // removed, the matter is easy: set the contents size to 0. If there
  // are no widgets because previously existing widgets were removed
  // (we detect that by looking at the contentsWidth and -Height).
  if (widgetList->isEmpty()) {
    if ((contentsWidth() != 0) || (contentsHeight() != 0)) {
      TQScrollView::resizeContents(0,0);
    }
    return;
  }

  // Ok, now we are in a situation where we do have some widgets that
  // shall be centered.
  int distance = distanceBetweenWidgets;
  if (singlePageFullScreenMode())
  {
    // In single page fullscreen mode we don't want a margin around the pages
    distance = 0;
  }

  TQMemArray<TQ_UINT32> colWidth(nrCols);
  for(TQ_UINT8 i=0; i<colWidth.size(); i++)
    colWidth[i] = 0;

  TQ_UINT16 numRows;
  if(nrCols <= 2)
  {
    numRows = (widgetList->size()+2*nrCols-2) / nrCols;
  }
  else
  {
    numRows = (TQ_INT16)ceil(((double)widgetList->size()) / nrCols);
  }

  TQMemArray<TQ_UINT32> rowHeight(numRows);
  for(TQ_UINT16 i=0; i<rowHeight.size(); i++)
    rowHeight[i] = 0;

  // Now find the widths and heights of the columns
  for(TQ_UINT16 i=0; i<widgetList->size(); i++) 
  {
    TQ_UINT8 col;
    TQ_UINT16 row;

    if (nrCols == 2) {
      // In two-column display, start with the right column
      col = (i+1+nrCols) % nrCols;
      row = (i+1+nrCols) / nrCols - 1;
    } else {
      col = (i+nrCols) % nrCols;
      row = (i+nrCols) / nrCols - 1;
    }

    colWidth[col] = TQMAX(colWidth[col], (TQ_UINT32)widgetList->at(i)->pageSize().width());
    rowHeight[row] = TQMAX(rowHeight[row], (TQ_UINT32)widgetList->at(i)->pageSize().height());
  }

  // Calculate the total width and height of the display
  TQ_UINT32 totalHeight = 0;
  for(TQ_UINT16 i=0; i<rowHeight.size(); i++)
    totalHeight += rowHeight[i];

  totalHeight += (numRows+1)*distance;
  TQ_UINT32 totalWidth = 0;
  for(TQ_UINT8 i=0; i<colWidth.size(); i++)
    totalWidth += colWidth[i];

  totalWidth += (nrCols+1)*distance;
  TQSize newViewportSize = viewportSize( totalWidth, totalHeight );
  TQ_UINT32 centeringLeft = 0;
  if( (TQ_UINT32)newViewportSize.width() > totalWidth )
    centeringLeft = ( newViewportSize.width() - totalWidth )/2;
  TQ_UINT32 centeringTop = 0;
  if( (TQ_UINT32)newViewportSize.height() > totalHeight )
    centeringTop = ( newViewportSize.height() - totalHeight)/2;

  // Resize the viewport
  if (((TQ_UINT32)contentsWidth() != totalWidth) || ((TQ_UINT32)contentsHeight() != totalHeight))
  {
    // Calculate the point in the coordinates of the contents which is currently at the center of the viewport.
    TQPoint midPoint = TQPoint(visibleWidth() / 2 + contentsX(), visibleHeight() / 2 + contentsY()); 
    double midPointRatioX = (double)(midPoint.x()) / contentsWidth();
    double midPointRatioY = (double)(midPoint.y()) / contentsHeight();

    resizeContents(totalWidth,totalHeight);

    // If the zoom changed recenter the former midPoint
    if (zoomChanged)
      center((int)(contentsWidth() * midPointRatioX), (int)(contentsHeight() * midPointRatioY));
  }

  // Finally, calculate the left and top coordinates of each row and
  // column, respectively
  TQMemArray<TQ_UINT32> colLeft(nrCols);
  colLeft[0] = distance;
  for(TQ_UINT8 i=1; i<colLeft.size(); i++)
    colLeft[i] = colLeft[i-1]+colWidth[i-1]+distance;

  TQMemArray<TQ_UINT32> rowTop(numRows);
  rowTop[0] = distance;
  for(TQ_UINT16 i=1; i<rowTop.size(); i++)
    rowTop[i] = rowTop[i-1]+rowHeight[i-1]+distance;

  for(TQ_UINT16 i=0; i<widgetList->size(); i++) 
  {
    TQ_UINT8 col;
    TQ_UINT16 row;
    if (nrCols == 2)
    {
      // In two column-mode start with the right column.
      col = (i+nrCols-1) % nrCols;
      row = (i+nrCols-1) / nrCols;
    }
    else
    {
      col = (i+nrCols) % nrCols;
      row = i / nrCols;
    }
    if (nrCols == 2)
    {
      // in 2-column mode right justify the first column, and leftjustify the second column
      int width = widgetList->at(i)->width();
      int left;
      if (col == 0)
        left = centeringLeft + colLeft[col] + colWidth[col]-width + distance/2;
      else
        left = centeringLeft + colLeft[col];
      moveChild( widgetList->at(i), left, centeringTop+rowTop[row]);
    }
    else
    {
      // in single column and overview mode center the widgets
      int widgetWidth = widgetList->at(i)->width();
      int left = centeringLeft + colLeft[col] + ((int)colWidth[col]-widgetWidth)/2;
      moveChild(widgetList->at(i), left, centeringTop+rowTop[row]);
    }
  }
  calculateCurrentPageNumber();
}


void PageView::contentsWheelEvent ( TQWheelEvent * e )
{
  emit(wheelEventReceived(e));
}


void PageView::moveViewportToWidget(TQWidget* widget, int y)
{
  int verticalPos = 0;
  int verticalPosTop = 0;

  if (y != 0)
  {
    verticalPosTop = childY(widget) +  y - visibleHeight()/2;
    verticalPos = childY(widget) +  y;
  }
  else
  {
    verticalPos = childY(widget) - distanceBetweenWidgets;
    verticalPosTop = verticalPos;
  }

  if (nrCols == 1)
  {
    // In single column viewmodes, we change the vertical position only, to make it
    // easier to work with high zoomlevels where not the whole pagewidth is visible.
    // TODO: Smarter algorithm also for continuous facing viewmode.
    int top = (int)(contentsY() + 0.1 * visibleHeight());
    int bottom = (int)(contentsY() + 0.9 * visibleHeight());

    // Move the viewport if the target is currently not visible, or lies at the edge
    // of the viewport. If y = 0 always move the top of the targetpage to the top edge
    // of the viewport.
    if (verticalPos < top || verticalPos > bottom || y == 0)
    {
      setContentsPos(contentsX(), verticalPosTop);
    }
  }
  else
  {
    setContentsPos(childX(widget) - distanceBetweenWidgets, verticalPosTop);
  }
}


void PageView::viewportPaintEvent(TQPaintEvent* e)
{
  // Region from which rectangles occupied by child widgets will by substracted.
  TQRegion backgroundArea(e->rect());

  if (widgetList != 0)
  {
    for (unsigned int i = 0; i < widgetList->count(); i++)
    {
      DocumentWidget* item = widgetList->at(i);

      // Check if the Widget needs to be updated.
      if (!item->tqgeometry().intersects(e->rect()))
        continue;

      TQRect widgetGeometry = item->tqgeometry();

      // Draw the widget.
      if (e->rect().intersects(widgetGeometry))
      {
        TQRect widgetRect = e->rect().intersect(widgetGeometry);
        widgetRect.moveBy(-widgetGeometry.left(), -widgetGeometry.top());

        item->update(widgetRect);
      }

      // Substract the painted area.
      backgroundArea -= widgetGeometry.intersect(e->rect());
    }
  }

  // Paint the background.
  TQPainter p(viewport());

  TQMemArray<TQRect> backgroundRects = backgroundArea.tqrects();

  for (unsigned int i = 0; i < backgroundRects.count(); i++)
    p.fillRect(backgroundRects[i], colorGroup().mid());
}


void PageView::calculateCurrentPageNumber(int x, int y)
{
  // Safety check
  if (widgetList == 0)
    return;

  TQRect viewportRect(x, y, visibleWidth(), visibleHeight());

  //kdDebug() << "viewportRect(" << viewportRect.x() << ", " << viewportRect.y() << ", "
  //          << viewportRect.width() << ", " << viewportRect.height() << ")" << endl;

  int maxVisiblePixels = 0;
  DocumentWidget* _currentWidget = 0;

  for (TQ_UINT16 i = 0; i < widgetList->size(); i++)
  {
    DocumentWidget* documentWidget = widgetList->at(i);
    // Safety check
    if (documentWidget == 0)
      continue;

    // Check if the Widget is visible
    int cx = childX(documentWidget);
    int cy = childY(documentWidget);
    TQRect widgetRect(cx, cy, documentWidget->width(), documentWidget->height());
    bool isVisible = widgetRect.intersects(viewportRect);

    if (!isVisible)
      continue;

    // Calculate the number of visible pixels of the widget
    TQRect visibleRect = widgetRect.intersect(viewportRect);
    int visiblePixels = visibleRect.width() * visibleRect.height();

    //kdDebug() << visiblePixels << " pixels are visible of page " << documentWidget->getPageNumber() << endl;

    // If a bigger part of this widget as of the previous widgets is visible make it the current widget.
    if (maxVisiblePixels < visiblePixels)
    {
      maxVisiblePixels = visiblePixels;
      _currentWidget = documentWidget;
    }
  }

  // No page is visible
  if (_currentWidget == 0)
    return;

  // Return the number of the current page
  emit currentPageChanged(_currentWidget->getPageNumber());
}

void PageView::calculateCurrentPageNumber()
{
  calculateCurrentPageNumber(contentsX(), contentsY());
}

void PageView::slotEnableMoveTool(bool enable)
{
  moveTool = enable;
}

#include "pageView.moc"