mirror of
https://github.com/libretro/RetroArch
synced 2025-02-01 20:54:10 +00:00
394 lines
11 KiB
C++
394 lines
11 KiB
C++
#include <QScrollBar>
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#include <QPainter>
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#include "gridview.h"
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#include "../ui_qt.h"
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/* http://www.informit.com/articles/article.aspx?p=1613548 */
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ThumbnailDelegate::ThumbnailDelegate(QObject* parent) :
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QStyledItemDelegate(parent)
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{
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}
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void ThumbnailDelegate::paint(QPainter* painter, const QStyleOptionViewItem &option, const QModelIndex& index) const
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{
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painter->save();
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QStyleOptionViewItem opt = option;
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initStyleOption(&opt, index);
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const QWidget *widget = opt.widget;
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QStyle *style = widget->style();
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int margin = 11;
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int textMargin = 4;
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QRect rect = opt.rect;
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int textHeight = painter->fontMetrics().height() + margin + margin;
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QRect adjusted = rect.adjusted(margin, margin, -margin, -textHeight + textMargin);
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QPixmap pixmap = index.data(PlaylistModel::THUMBNAIL).value<QPixmap>();
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// draw the background
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style->drawPrimitive(QStyle::PE_PanelItemViewItem, &opt, painter, widget);
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// draw the image
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if (!pixmap.isNull())
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{
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QPixmap pixmapScaled = pixmap.scaled(adjusted.size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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style->drawItemPixmap(painter, adjusted, Qt::AlignHCenter | Qt::AlignBottom, pixmapScaled);
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}
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// draw the text
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if (!opt.text.isEmpty())
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{
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QPalette::ColorGroup cg = opt.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
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if (cg == QPalette::Normal && !(opt.state & QStyle::State_Active))
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cg = QPalette::Inactive;
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if (opt.state & QStyle::State_Selected)
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painter->setPen(opt.palette.color(cg, QPalette::HighlightedText));
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else
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painter->setPen(opt.palette.color(cg, QPalette::Text));
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QRect textRect = QRect(rect.x() + margin, rect.y() + adjusted.height() - textMargin + margin, rect.width() - 2 * margin, textHeight);
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QString elidedText = painter->fontMetrics().elidedText(opt.text, opt.textElideMode, textRect.width(), Qt::TextShowMnemonic);
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painter->setFont(opt.font);
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painter->drawText(textRect, Qt::AlignCenter, elidedText);
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}
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painter->restore();
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}
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GridView::GridView(QWidget *parent) : QAbstractItemView(parent), m_idealHeight(0), m_hashIsDirty(false)
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{
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setFocusPolicy(Qt::WheelFocus);
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horizontalScrollBar()->setRange(0, 0);
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verticalScrollBar()->setRange(0, 0);
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}
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void GridView::setModel(QAbstractItemModel *newModel)
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{
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if (model())
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disconnect(model(), SIGNAL(rowsRemoved(QModelIndex, int, int)), this, SLOT(rowsRemoved(QModelIndex, int, int)));
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QAbstractItemView::setModel(newModel);
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connect(newModel, SIGNAL(rowsRemoved(QModelIndex, int, int)), this, SLOT(rowsRemoved(QModelIndex, int, int)));
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m_hashIsDirty = true;
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}
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void GridView::setviewMode(ViewMode mode)
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{
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m_viewMode = mode;
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}
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void GridView::calculateRectsIfNecessary() const
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{
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if (!m_hashIsDirty)
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return;
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int x = m_spacing;
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int y = m_spacing;
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int row;
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int nextX;
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const int maxWidth = viewport()->width();
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switch (m_viewMode) {
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case Anchored:
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{
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int columns = (maxWidth - m_spacing) / (m_size + m_spacing);
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if (columns > 0)
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{
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const int actualSpacing = (maxWidth - m_spacing - m_size - (columns - 1) * m_size) / columns;
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for (row = 0; row < model()->rowCount(); ++row)
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{
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nextX = x + m_size + actualSpacing;
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if (nextX > maxWidth)
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{
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x = m_spacing;
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y += m_size + m_spacing;
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nextX = x + m_size + actualSpacing;
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}
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m_rectForRow[row] = QRectF(x, y, m_size, m_size);
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x = nextX;
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}
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m_idealHeight = y + m_size + m_spacing;
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}
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break;
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}
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case Centered:
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{
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int columns = (maxWidth - m_spacing) / (m_size + m_spacing);
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if (columns > 0)
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{
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const int actualSpacing = (maxWidth - columns * m_size) / (columns + 1);
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x = actualSpacing;
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for (row = 0; row < model()->rowCount(); ++row)
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{
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nextX = x + m_size + actualSpacing;
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if (nextX > maxWidth)
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{
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x = actualSpacing;
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y += m_size + m_spacing;
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nextX = x + m_size + actualSpacing;
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}
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m_rectForRow[row] = QRectF(x, y, m_size, m_size);
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x = nextX;
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}
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m_idealHeight = y + m_size + m_spacing;
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}
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break;
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}
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case Simple:
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for (row = 0; row < model()->rowCount(); ++row)
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{
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nextX = x + m_size + m_spacing;
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if (nextX > maxWidth)
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{
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x = m_spacing;
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y += m_size + m_spacing;
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nextX = x + m_size + m_spacing;
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}
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m_rectForRow[row] = QRectF(x, y, m_size, m_size);
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x = nextX;
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}
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break;
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}
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m_hashIsDirty = false;
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viewport()->update();
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}
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QRect GridView::visualRect(const QModelIndex &index) const
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{
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QRect rect;
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if (index.isValid())
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rect = viewportRectForRow(index.row()).toRect();
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return rect;
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}
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QRectF GridView::viewportRectForRow(int row) const
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{
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calculateRectsIfNecessary();
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QRectF rect = m_rectForRow.value(row).toRect();
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if (!rect.isValid())
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return rect;
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return QRectF(rect.x() - horizontalScrollBar()->value(), rect.y() - verticalScrollBar()->value(), rect.width(), rect.height());
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}
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void GridView::scrollTo(const QModelIndex &index, QAbstractItemView::ScrollHint)
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{
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QRect viewRect = viewport()->rect();
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QRect itemRect = visualRect(index);
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if (itemRect.left() < viewRect.left())
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horizontalScrollBar()->setValue(horizontalScrollBar()->value() + itemRect.left() - viewRect.left());
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else if (itemRect.right() > viewRect.right())
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horizontalScrollBar()->setValue(horizontalScrollBar()->value() + qMin(itemRect.right() - viewRect.right(), itemRect.left() - viewRect.left()));
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if (itemRect.top() < viewRect.top())
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verticalScrollBar()->setValue(verticalScrollBar()->value() + itemRect.top() - viewRect.top());
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else if (itemRect.bottom() > viewRect.bottom())
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verticalScrollBar()->setValue(verticalScrollBar()->value() + qMin(itemRect.bottom() - viewRect.bottom(), itemRect.top() - viewRect.top()));
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viewport()->update();
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}
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QModelIndex GridView::indexAt(const QPoint &point_) const
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{
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QPoint point(point_);
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point.rx() += horizontalScrollBar()->value();
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point.ry() += verticalScrollBar()->value();
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calculateRectsIfNecessary();
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QHashIterator<int, QRectF> i(m_rectForRow);
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while (i.hasNext())
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{
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i.next();
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if (i.value().contains(point))
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return model()->index(i.key(), 0, rootIndex());
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}
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return QModelIndex();
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}
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void GridView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
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{
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m_hashIsDirty = true;
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QAbstractItemView::dataChanged(topLeft, bottomRight);
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}
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void GridView::refresh()
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{
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m_hashIsDirty = true;
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calculateRectsIfNecessary();
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updateGeometries();
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}
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void GridView::rowsInserted(const QModelIndex &parent, int start, int end)
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{
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QAbstractItemView::rowsInserted(parent, start, end);
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refresh();
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}
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void GridView::rowsRemoved(const QModelIndex &parent, int start, int end)
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{
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refresh();
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}
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void GridView::setGridSize(const int newSize)
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{
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if (newSize != m_size)
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{
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m_size = newSize;
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refresh();
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}
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}
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void GridView::resizeEvent(QResizeEvent*)
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{
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refresh();
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}
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void GridView::reset()
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{
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m_visibleIndexes.clear();
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QAbstractItemView::reset();
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refresh();
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}
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QModelIndex GridView::moveCursor(QAbstractItemView::CursorAction cursorAction, Qt::KeyboardModifiers)
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{
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QModelIndex index = currentIndex();
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if (index.isValid())
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{
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if ((cursorAction == MoveLeft && index.row() > 0) || (cursorAction == MoveRight && index.row() + 1 < model()->rowCount()))
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{
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const int offset = (cursorAction == MoveLeft ? -1 : 1);
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index = model()->index(index.row() + offset, index.column(), index.parent());
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}
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else if ((cursorAction == MoveUp && index.row() > 0) || (cursorAction == MoveDown && index.row() + 1 < model()->rowCount()))
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{
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const int offset = ((m_size + m_spacing) * (cursorAction == MoveUp ? -1 : 1));
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QRect rect = viewportRectForRow(index.row()).toRect();
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QPoint point(rect.center().x(), rect.center().y() + offset);
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index = indexAt(point);
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}
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}
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return index;
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}
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int GridView::horizontalOffset() const
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{
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return horizontalScrollBar()->value();
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}
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int GridView::verticalOffset() const
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{
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return verticalScrollBar()->value();
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}
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void GridView::scrollContentsBy(int dx, int dy)
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{
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scrollDirtyRegion(dx, dy);
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viewport()->scroll(dx, dy);
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emit(visibleItemsChangedMaybe());
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}
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QVector<QModelIndex> GridView::visibleIndexes() const {
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return m_visibleIndexes;
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}
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void GridView::setSelection(const QRect &rect, QFlags<QItemSelectionModel::SelectionFlag> flags)
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{
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QRect rectangle = rect.translated(horizontalScrollBar()->value(), verticalScrollBar()->value()).normalized();
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calculateRectsIfNecessary();
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QHashIterator<int, QRectF> i(m_rectForRow);
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int firstRow = model()->rowCount();
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int lastRow = -1;
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while (i.hasNext())
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{
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i.next();
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if (i.value().intersects(rectangle))
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{
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firstRow = firstRow < i.key() ? firstRow : i.key();
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lastRow = lastRow > i.key() ? lastRow : i.key();
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}
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}
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if (firstRow != model()->rowCount() && lastRow != -1)
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{
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QItemSelection selection( model()->index(firstRow, 0, rootIndex()), model()->index(lastRow, 0, rootIndex()));
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selectionModel()->select(selection, flags);
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}
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else
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{
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QModelIndex invalid;
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QItemSelection selection(invalid, invalid);
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selectionModel()->select(selection, flags);
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}
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}
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QRegion GridView::visualRegionForSelection(const QItemSelection &selection) const
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{
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QRegion region;
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foreach(const QItemSelectionRange &range, selection)
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{
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for (int row = range.top(); row <= range.bottom(); ++row)
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{
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for (int column = range.left(); column < range.right(); ++column)
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{
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QModelIndex index = model()->index(row, column, rootIndex());
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region += visualRect(index);
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}
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}
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}
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return region;
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}
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void GridView::paintEvent(QPaintEvent*)
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{
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QPainter painter(viewport());
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int row;
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painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
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m_visibleIndexes.clear();
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for (row = 0; row < model()->rowCount(rootIndex()); ++row)
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{
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QModelIndex index = model()->index(row, 0, rootIndex());
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QRectF rect = viewportRectForRow(row);
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if (!rect.isValid() || rect.bottom() < 0 || rect.y() > viewport()->height())
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continue;
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m_visibleIndexes.append(index);
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QStyleOptionViewItem option = viewOptions();
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option.rect = rect.toRect();
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if (selectionModel()->isSelected(index))
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option.state |= QStyle::State_Selected;
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if (currentIndex() == index)
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option.state |= QStyle::State_HasFocus;
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itemDelegate()->paint(&painter, option, index);
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}
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}
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void GridView::updateGeometries()
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{
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const int RowHeight = m_size + m_spacing;
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QAbstractItemView::updateGeometries();
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verticalScrollBar()->setSingleStep(RowHeight);
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verticalScrollBar()->setPageStep(viewport()->height());
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verticalScrollBar()->setRange(0, qMax(0, m_idealHeight - viewport()->height()));
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horizontalScrollBar()->setPageStep(viewport()->width());
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horizontalScrollBar()->setRange(0, qMax(0, RowHeight - viewport()->width()));
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emit(visibleItemsChangedMaybe());
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}
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