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tdegraphics/kviewshell/pageView.cpp

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15 KiB

/* 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(TQWidget::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() == TQt::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() == TQt::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->geometry().intersects(e->rect()))
continue;
TQRect widgetGeometry = item->geometry();
// 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.rects();
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"