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75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#pragma once
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#include <QAbstractTextDocumentLayout>
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#include <QApplication>
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#include <QStyledItemDelegate>
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#include <QTextDocument>
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class richtext_item_delegate : public QStyledItemDelegate
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{
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private:
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QTextDocument* m_document;
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public:
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explicit richtext_item_delegate(QObject* parent = nullptr)
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: QStyledItemDelegate(parent)
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, m_document(new QTextDocument(this))
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{
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}
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void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override
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{
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painter->save();
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// Initialize style option
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QStyleOptionViewItem opt = option;
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initStyleOption(&opt, index);
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// Setup the QTextDocument with our HTML
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m_document->setHtml(opt.text);
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opt.text.clear();
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// Get the available style
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QStyle* style = opt.widget ? opt.widget->style() : QApplication::style();
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// Draw our widget if available
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style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, opt.widget);
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// Adjust our painter parameters with some magic that looks good.
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// This is necessary so that we don't draw on top of the optional widget.
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// If you're not happy with this code don't hesitate to contact Megamouse
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#ifdef __linux__
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static constexpr int margin_adjustement = 12;
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#else
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static constexpr int margin_adjustement = 4;
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#endif
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const int margin = (option.rect.height() - opt.fontMetrics.height() - margin_adjustement);
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QRect text_rect = style->subElementRect(QStyle::SE_ItemViewItemText, &opt, nullptr);
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if (index.column() != 0)
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{
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text_rect.adjust(5, 0, 0, 0);
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}
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text_rect.setTop(text_rect.top() + margin);
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painter->translate(text_rect.topLeft());
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#ifndef __linux__
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painter->setClipRect(text_rect.translated(-text_rect.topLeft()));
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#endif
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// Create a context for our painter
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QAbstractTextDocumentLayout::PaintContext context;
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// Apply the styled palette
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context.palette = opt.palette;
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// Draw the text
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m_document->documentLayout()->draw(painter, context);
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painter->restore();
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}
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};
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