File indexing completed on 2024-04-28 17:07:10

 /*
     This file is part of the Okteta Gui library, made within the KDE community.
 
     SPDX-FileCopyrightText: 2003, 2007, 2008 Friedrich W. H. Kossebau <kossebau@kde.org>
 
     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #include "columnsview.hpp"
 #include "columnsview_p.hpp"
 
 // Qt
 #include <QPaintEvent>
 #include <QPainter>
 #include <QStyle>
 #include <QScrollBar>
 
 namespace Okteta {
 
 ColumnsView::ColumnsView(ColumnsViewPrivate* dd, QWidget* parent)
     : QAbstractScrollArea(parent)
     , d_ptr(dd)
 {
     Q_D(ColumnsView);
 
     d->init();
 }
 
 ColumnsView::ColumnsView(/*bool R,*/ QWidget* parent)
     : QAbstractScrollArea(parent)
     , d_ptr(new ColumnsViewPrivate(this))
 {
     Q_D(ColumnsView);
 
     d->init();
 }
 
 ColumnsView::~ColumnsView() = default;
 
 LineSize ColumnsView::noOfLines() const
 {
     Q_D(const ColumnsView);
 
     return d->NoOfLines;
 }
 
 PixelY ColumnsView::lineHeight() const
 {
     Q_D(const ColumnsView);
 
     return d->LineHeight;
 }
 
 Line ColumnsView::lineAt(PixelY y) const
 {
     Q_D(const ColumnsView);
 
     return (d->LineHeight != 0) ? y / d->LineHeight : 0;
 }
 
 LineRange ColumnsView::visibleLines() const
 {
     const PixelYRange ySpan = PixelYRange::fromWidth(yOffset(), visibleHeight());
     return LineRange(lineAt(ySpan.start()), lineAt(ySpan.end()));
 }
 LineRange ColumnsView::visibleLines(const PixelYRange& yPixels) const
 {
     return LineRange(lineAt(yPixels.start()), lineAt(yPixels.end()));
 }
 
 PixelX ColumnsView::visibleWidth() const
 {
     return viewport()->width();
 }
 
 PixelY ColumnsView::visibleHeight() const
 {
     return viewport()->height();
 }
 
 PixelY ColumnsView::columnsHeight() const
 {
     Q_D(const ColumnsView);
 
     return d->NoOfLines * d->LineHeight;
 }
 
 PixelX ColumnsView::columnsWidth() const
 {
     Q_D(const ColumnsView);
 
     return d->ColumnsWidth;
 }
 
 QPoint ColumnsView::viewportToColumns(const QPoint& point) const
 {
     return QPoint(xOffset(), yOffset()) + point;
 }
 
 PixelX ColumnsView::xOffset() const
 {
     return horizontalScrollBar()->value();
 }
 
 PixelY ColumnsView::yOffset() const
 {
     return verticalScrollBar()->value();
 }
 
 PixelY ColumnsView::yOffsetOfLine(Line lineIndex) const
 {
     Q_D(const ColumnsView);
 
     return lineIndex * d->LineHeight - yOffset();
 }
 
 void ColumnsView::setColumnsPos(PixelX x, PixelY y)
 {
     horizontalScrollBar()->setValue(x);
     verticalScrollBar()->setValue(y);
 }
 
 void ColumnsView::setNoOfLines(LineSize newNoOfLines)
 {
     Q_D(ColumnsView);
 
     if (d->NoOfLines == newNoOfLines) {
         return;
     }
 
     d->NoOfLines = newNoOfLines;
 
     updateScrollBars();
 }
 
 void ColumnsView::setLineHeight(PixelY newLineHeight)
 {
     Q_D(ColumnsView);
 
     if (newLineHeight == d->LineHeight) {
         return;
     }
 
     d->LineHeight = newLineHeight;
 
     for (auto column : qAsConst(d->columns)) {
         column->setLineHeight(d->LineHeight);
     }
 
     verticalScrollBar()->setSingleStep(d->LineHeight);
     updateScrollBars();
 }
 
 void ColumnsView::updateWidths()
 {
     Q_D(ColumnsView);
 
     d->updateWidths();
 
     updateScrollBars();
 }
 
 void ColumnsView::updateScrollBars()
 {
     QSize viewSize = maximumViewportSize();
 
     const int scrollBarWidth = style()->pixelMetric(QStyle::PM_ScrollBarExtent);
     const PixelY usedHeight = columnsHeight();
     const PixelX usedWidth = columnsWidth();
 
     const bool needsVerticalBarDefinitely = (usedHeight > viewSize.height());
     const bool needsHorizontalBarDefinitely = (usedWidth > viewSize.width());
 
     if (needsVerticalBarDefinitely) {
         viewSize.rwidth() -= scrollBarWidth;
     }
     if (needsHorizontalBarDefinitely) {
         viewSize.rheight() -= scrollBarWidth;
     }
     // check again if bars are not needed now
     if (!needsVerticalBarDefinitely && usedHeight > viewSize.height()) {
         viewSize.rwidth() -= scrollBarWidth;
     }
     if (!needsHorizontalBarDefinitely && usedWidth > viewSize.width()) {
         viewSize.rheight() -= scrollBarWidth;
     }
 
     verticalScrollBar()->setRange(0, usedHeight - viewSize.height());
     verticalScrollBar()->setPageStep(viewSize.height());
     horizontalScrollBar()->setRange(0, usedWidth - viewSize.width());
     horizontalScrollBar()->setPageStep(viewSize.width());
 }
 
 void ColumnsView::updateColumn(AbstractColumnRenderer& columnRenderer)
 {
     if (columnRenderer.isVisible()) {
         viewport()->update(columnRenderer.x() - xOffset(), 0, columnRenderer.width(), visibleHeight());
     }
 }
 
 void ColumnsView::updateColumn(AbstractColumnRenderer& columnRenderer, const LineRange& lines)
 {
     Q_D(ColumnsView);
 
     if (columnRenderer.isVisible()) { // TODO: catch hidden range && columnRenderer.overlaps(Xs) )
         LineRange linesToUpdate = visibleLines();
         linesToUpdate.restrictTo(lines);
         if (linesToUpdate.isValid()) {
             const PixelX x = columnRenderer.x() - xOffset();
             const PixelY y = yOffsetOfLine(linesToUpdate.start());
             const int width = columnRenderer.width();
             const int height = d->LineHeight * linesToUpdate.width();
             viewport()->update(x, y, width, height);
         }
     }
 }
 
 LineSize ColumnsView::noOfLinesPerPage() const
 {
     Q_D(const ColumnsView);
 
     if (d->LineHeight < 1) {
         return 1;
     }
 
     LineSize result = (visibleHeight() - 1) / d->LineHeight; // -1 ensures to get always the last visible line
 
     if (result < 1) {
         // ensure to move down at least one line
         result = 1;
     }
 
     return result;
 }
 
 void ColumnsView::addColumn(AbstractColumnRenderer* columnRenderer)
 {
     Q_D(ColumnsView);
 
 //   if( Reversed )
 //     Columns.prepend( C );
 //   else
     d->columns.append(columnRenderer);
 
     updateWidths();
 }
 
 void ColumnsView::removeColumn(AbstractColumnRenderer* columnRenderer)
 {
     Q_D(ColumnsView);
 
     const int columnRendererIndex = d->columns.indexOf(columnRenderer);
     if (columnRendererIndex != -1) {
         d->columns.removeAt(columnRendererIndex);
     }
 
     delete columnRenderer;
 
     updateWidths();
 }
 
 void ColumnsView::scrollContentsBy(int dx, int dy)
 {
     viewport()->scroll(dx, dy);
 }
 
 bool ColumnsView::event(QEvent* event)
 {
     if (event->type() == QEvent::StyleChange || event->type() == QEvent::LayoutRequest) {
         updateScrollBars();
     }
 
     return QAbstractScrollArea::event(event);
 }
 
 void ColumnsView::resizeEvent(QResizeEvent* event)
 {
     updateScrollBars();
 
     QAbstractScrollArea::resizeEvent(event);
 }
 
 void ColumnsView::paintEvent(QPaintEvent* paintEvent)
 {
     QAbstractScrollArea::paintEvent(paintEvent);
 
     const PixelX x = xOffset();
     const PixelY y = yOffset();
 
     QRect dirtyRect = paintEvent->rect();
     dirtyRect.translate(x, y);
 
     QPainter painter(viewport());
     painter.translate(-x, -y);
 
     renderColumns(&painter, dirtyRect.x(), dirtyRect.y(), dirtyRect.width(), dirtyRect.height());
 }
 
 void ColumnsView::renderColumns(QPainter* painter, int cx, int cy, int cw, int ch)
 {
     Q_D(ColumnsView);
 
     PixelXRange dirtyXs = PixelXRange::fromWidth(cx, cw);
 
     // content to be shown?
     if (dirtyXs.startsBefore(d->ColumnsWidth)) {
         PixelYRange dirtyYs = PixelYRange::fromWidth(cy, ch);
 
         // collect affected columns
         QVector<AbstractColumnRenderer*> dirtyColumns;
         dirtyColumns.reserve(d->columns.size());
         for (auto column : qAsConst(d->columns)) {
             if (column->isVisible() && column->overlaps(dirtyXs)) {
                 dirtyColumns.append(column);
             }
         }
 
         // any lines of any columns to be drawn?
         if (d->NoOfLines > 0) {
             // calculate affected lines
             LineRange dirtyLines = visibleLines(dirtyYs);
             dirtyLines.restrictEndTo(d->NoOfLines - 1);
 
             if (dirtyLines.isValid()) {
                 // paint full columns
                 for (auto column : qAsConst(d->columns)) {
                     column->renderColumn(painter, dirtyXs, dirtyYs);
                 }
 
                 PixelY cy = dirtyLines.start() * d->LineHeight;
                 // qCDebug(LOG_OKTETA_GUI)<<"Dirty lines: "<<dirtyLines.start()<<"-"<<dirtyLines.end();
                 // starting painting with the first line
                 Line line = dirtyLines.start();
                 auto it = dirtyColumns.constBegin();
                 AbstractColumnRenderer* column = *it;
                 painter->translate(column->x(), cy);
 
                 while (true) {
                     column->renderFirstLine(painter, dirtyXs, line);
                     ++it;
                     if (it == dirtyColumns.constEnd()) {
                         break;
                     }
                     painter->translate(column->width(), 0);
                     column = *it;
                 }
                 painter->translate(-column->x(), 0);
 
                 // Go through the other lines
                 while (true) {
                     ++line;
 
                     if (line > dirtyLines.end()) {
                         break;
                     }
 
                     it = dirtyColumns.constBegin();
                     column = *it;
                     painter->translate(column->x(), d->LineHeight);
 
                     while (true) {
                         column->renderNextLine(painter);
                         ++it;
                         if (it == dirtyColumns.constEnd()) {
                             break;
                         }
                         painter->translate(column->width(), 0);
                         column = *it;
                     }
                     painter->translate(-column->x(), 0);
                 }
                 cy = dirtyLines.end() * d->LineHeight;
 
                 painter->translate(0, -cy);
             }
         }
 
         // draw empty columns?
         dirtyYs.setStart(columnsHeight());
         if (dirtyYs.isValid()) {
             for (auto column : qAsConst(dirtyColumns)) {
                 column->renderEmptyColumn(painter, dirtyXs, dirtyYs);
             }
         }
     }
 
     // painter empty rects
     dirtyXs.setStart(d->ColumnsWidth);
     if (dirtyXs.isValid()) {
         renderEmptyArea(painter, dirtyXs.start(), cy, dirtyXs.width(), ch);
     }
 }
 
 void ColumnsView::renderEmptyArea(QPainter* painter, int cx, int cy, int cw, int ch)
 {
     painter->fillRect(cx, cy, cw, ch, viewport()->palette().brush(QPalette::Base)); // TODO: use stylist here, too
 }
 
 }
 
 #include "moc_columnsview.cpp"