232 lines
7.5 KiB
C++
232 lines
7.5 KiB
C++
#include "instancedelegate.h"
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#include <QPainter>
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#include <QTextOption>
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#include <QTextLayout>
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#include <QApplication>
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#include <QtCore/qmath.h>
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// Origin: Qt
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static void viewItemTextLayout ( QTextLayout &textLayout, int lineWidth, qreal &height, qreal &widthUsed )
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{
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height = 0;
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widthUsed = 0;
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textLayout.beginLayout();
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QString str = textLayout.text();
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while ( true )
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{
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QTextLine line = textLayout.createLine();
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if ( !line.isValid() )
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break;
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if(line.textLength() == 0)
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break;
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line.setLineWidth ( lineWidth );
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line.setPosition ( QPointF ( 0, height ) );
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height += line.height();
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widthUsed = qMax ( widthUsed, line.naturalTextWidth() );
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}
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textLayout.endLayout();
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}
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#define QFIXED_MAX (INT_MAX/256)
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ListViewDelegate::ListViewDelegate ( QObject* parent ) : QStyledItemDelegate ( parent )
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{
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}
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void drawSelectionRect(QPainter *painter, const QStyleOptionViewItemV4 &option, const QRect &rect)
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{
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if ((option.state & QStyle::State_Selected))
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painter->fillRect ( rect, option.palette.brush ( QPalette::Highlight ) );
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else
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{
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QColor backgroundColor = option.palette.color(QPalette::Background);
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backgroundColor.setAlpha(160);
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painter->fillRect ( rect, QBrush(backgroundColor) );
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}
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}
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void drawFocusRect(QPainter *painter, const QStyleOptionViewItemV4 &option, const QRect &rect)
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{
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if (!(option.state & QStyle::State_HasFocus))
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return;
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QStyleOptionFocusRect opt;
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opt.direction = option.direction;
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opt.fontMetrics = option.fontMetrics;
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opt.palette = option.palette;
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opt.rect = rect;
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//opt.state = option.state | QStyle::State_KeyboardFocusChange | QStyle::State_Item;
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auto col = option.state & QStyle::State_Selected ? QPalette::Highlight : QPalette::Base;
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opt.backgroundColor = option.palette.color(col);
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// Apparently some widget styles expect this hint to not be set
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painter->setRenderHint(QPainter::Antialiasing, false);
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QStyle *style = option.widget ? option.widget->style() : QApplication::style();
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style->drawPrimitive(QStyle::PE_FrameFocusRect, &opt, painter, option.widget);
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painter->setRenderHint(QPainter::Antialiasing);
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}
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static QSize viewItemTextSize ( const QStyleOptionViewItemV4 *option )
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{
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QStyle *style = option->widget ? option->widget->style() : QApplication::style();
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QTextOption textOption;
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textOption.setWrapMode ( QTextOption::WrapAtWordBoundaryOrAnywhere );
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QTextLayout textLayout;
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textLayout.setTextOption ( textOption );
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textLayout.setFont ( option->font );
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textLayout.setText ( option->text );
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const int textMargin = style->pixelMetric ( QStyle::PM_FocusFrameHMargin, option, option->widget ) + 1;
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QRect bounds ( 0,0,100 - 2*textMargin,600 );
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qreal height = 0, widthUsed = 0;
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viewItemTextLayout ( textLayout, bounds.width(), height, widthUsed );
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const QSize size ( qCeil ( widthUsed ), qCeil ( height ) );
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return QSize ( size.width() + 2 * textMargin, size.height() );
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}
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void ListViewDelegate::paint ( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
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{
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QStyleOptionViewItemV4 opt = option;
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initStyleOption ( &opt, index );
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painter->save();
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painter->setClipRect ( opt.rect );
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opt.features |= QStyleOptionViewItem::WrapText;
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opt.text = index.data().toString();
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opt.textElideMode = Qt::ElideRight;
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opt.displayAlignment = Qt::AlignTop | Qt::AlignHCenter;
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QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
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//const int iconSize = style->pixelMetric(QStyle::PM_IconViewIconSize);
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const int iconSize = 48;
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QRect iconbox = opt.rect;
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const int textMargin = style->pixelMetric ( QStyle::PM_FocusFrameHMargin, 0, opt.widget ) + 1;
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QRect textRect = opt.rect;
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QRect textHighlightRect = textRect;
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// clip the decoration on top, remove width padding
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textRect.adjust ( textMargin,iconSize + textMargin + 5,-textMargin,0 );
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textHighlightRect.adjust ( 0,iconSize + 5,0,0 );
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// draw background
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{
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QSize textSize = viewItemTextSize ( &opt );
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QPalette::ColorGroup cg;
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QStyleOptionViewItemV4 opt2(opt);
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if((opt.widget && opt.widget->isEnabled()) || (opt.state & QStyle::State_Enabled))
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{
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if(! ( opt.state & QStyle::State_Active ))
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cg = QPalette::Inactive;
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else
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cg = QPalette::Normal;
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}
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else
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{
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cg = QPalette::Disabled;
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}
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opt2.palette.setCurrentColorGroup(cg);
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// fill in background, if any
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if ( opt.backgroundBrush.style() != Qt::NoBrush )
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{
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QPointF oldBO = painter->brushOrigin();
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painter->setBrushOrigin ( opt.rect.topLeft() );
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painter->fillRect ( opt.rect, opt.backgroundBrush );
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painter->setBrushOrigin ( oldBO );
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}
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if ( opt.showDecorationSelected )
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{
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drawSelectionRect(painter,opt2, opt.rect);
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drawFocusRect(painter,opt2, opt.rect);
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//painter->fillRect ( opt.rect, opt.palette.brush ( cg, QPalette::Highlight ) );
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}
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else
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{
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//if ( opt.state & QStyle::State_Selected )
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{
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//QRect textRect = subElementRect ( QStyle::SE_ItemViewItemText, opt, opt.widget );
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//painter->fillRect ( textHighlightRect, opt.palette.brush ( cg, QPalette::Highlight ) );
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drawSelectionRect(painter,opt2, textHighlightRect);
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drawFocusRect(painter,opt2, textHighlightRect);
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}
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}
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}
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// draw the icon
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{
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QIcon::Mode mode = QIcon::Normal;
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if ( ! ( opt.state & QStyle::State_Enabled ) )
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mode = QIcon::Disabled;
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else if ( opt.state & QStyle::State_Selected )
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mode = QIcon::Selected;
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QIcon::State state = opt.state & QStyle::State_Open ? QIcon::On : QIcon::Off;
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iconbox.setHeight ( iconSize );
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opt.icon.paint ( painter, iconbox, Qt::AlignCenter, mode, state );
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}
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// set the text colors
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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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{
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painter->setPen ( opt.palette.color ( cg, QPalette::HighlightedText ) );
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}
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else
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{
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painter->setPen ( opt.palette.color ( cg, QPalette::Text ) );
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}
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// draw the text
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QTextOption textOption;
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textOption.setWrapMode ( QTextOption::WrapAtWordBoundaryOrAnywhere );
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textOption.setTextDirection ( opt.direction );
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textOption.setAlignment ( QStyle::visualAlignment ( opt.direction, opt.displayAlignment ) );
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QTextLayout textLayout;
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textLayout.setTextOption ( textOption );
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textLayout.setFont ( opt.font );
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textLayout.setText ( opt.text );
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qreal width, height;
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viewItemTextLayout ( textLayout, textRect.width(), height, width );
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const int lineCount = textLayout.lineCount();
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const QRect layoutRect = QStyle::alignedRect ( opt.direction, opt.displayAlignment, QSize ( textRect.width(), int ( height ) ), textRect );
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const QPointF position = layoutRect.topLeft();
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for ( int i = 0; i < lineCount; ++i )
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{
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const QTextLine line = textLayout.lineAt ( i );
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line.draw ( painter, position );
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}
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painter->restore();
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}
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QSize ListViewDelegate::sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const
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{
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QStyleOptionViewItemV4 opt = option;
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initStyleOption ( &opt, index );
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opt.features |= QStyleOptionViewItem::WrapText;
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opt.text = index.data().toString();
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opt.textElideMode = Qt::ElideRight;
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opt.displayAlignment = Qt::AlignTop | Qt::AlignHCenter;
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QStyle *style = opt.widget ? opt.widget->style() : QApplication::style();
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const int textMargin = style->pixelMetric ( QStyle::PM_FocusFrameHMargin, &option, opt.widget ) + 1;
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int height = 48 + textMargin * 2 + 5; // TODO: turn constants into variables
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QSize szz = viewItemTextSize ( &opt );
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height += szz.height();
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// FIXME: maybe the icon items could scale and keep proportions?
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QSize sz ( 100,height );
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return sz;
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}
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