tools/chatgui: Qt5 GUI chat app stub with tray, channel list, message bubbles
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#include "messagedelegate.h"
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#include <QPainter>
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#include <QPainterPath>
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#include <QApplication>
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#include <QAbstractItemView>
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#include <QFontMetrics>
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MessageDelegate::MessageDelegate(QObject *parent)
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: QStyledItemDelegate(parent) {}
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QSize MessageDelegate::sizeHint(const QStyleOptionViewItem &option,
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const QModelIndex &index) const {
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Layout L = calcLayout(option, index);
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return QSize(L.viewWidth, L.totalHeight);
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}
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static int measureTextHeight(const QFont &font, const QString &text, int width) {
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if (text.isEmpty() || width <= 0) return 0;
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QRect r = QFontMetrics(font).boundingRect(QRect(0, 0, width, 100000),
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Qt::AlignLeft | Qt::TextWordWrap, text);
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return r.height();
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}
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MessageDelegate::Layout MessageDelegate::calcLayout(
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const QStyleOptionViewItem &option, const QModelIndex &index) const
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{
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Layout L{};
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L.viewWidth = 300;
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if (option.widget) {
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auto *v = qobject_cast<const QAbstractItemView *>(option.widget);
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if (v) L.viewWidth = v->viewport()->width();
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}
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if (L.viewWidth <= 0) L.viewWidth = 300;
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bool hasQuote = index.data(MsgHasQuoteRole).toBool();
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QString text = index.data(MsgTextRole).toString();
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QString qText = hasQuote ? index.data(MsgQuoteTextRole).toString() : QString();
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int bubbleW = L.viewWidth - kMarginH - kAvatar - kGap - kMarginH;
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if (bubbleW < 100) bubbleW = 100;
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L.bubbleWidth = bubbleW;
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int textW = bubbleW - 2 * kPadH;
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int qH = 0;
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if (hasQuote) {
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int qTextW = bubbleW - 2 * kPadH - kQuoteBarW - kQuotePadH;
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int qTextH = measureTextHeight(option.font, qText, qTextW);
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int qOneLineH = QFontMetrics(option.font).height();
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qH = kQuotePadV + qOneLineH + (qText.isEmpty() ? 0 : 2 + qTextH) + kQuotePadV;
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}
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int textH = measureTextHeight(option.font, text, textW);
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int bubbleH = kPadTop + (hasQuote ? qH + kQuoteGap : 0) + textH + kStatusH + kPadBot;
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L.totalHeight = qMax(bubbleH, kAvatar) + kItemGap;
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int contentLeft = kMarginH + kAvatar + kGap;
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L.bubbleRect = QRect(contentLeft, 0, bubbleW, bubbleH);
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int contentTop = kPadTop;
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if (hasQuote) {
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L.quoteRect = QRect(contentLeft + kPadH, contentTop, bubbleW - 2 * kPadH, qH);
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L.quoteBarRect = QRect(L.quoteRect.left(), L.quoteRect.top(),
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kQuoteBarW, qH);
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int tx = L.quoteBarRect.right() + kQuotePadH;
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L.quoteAuthorRect = QRect(tx, L.quoteRect.top() + kQuotePadV,
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L.quoteRect.width() - kQuoteBarW - kQuotePadH,
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QFontMetrics(option.font).height());
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L.quoteTextRect = QRect(tx,
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L.quoteAuthorRect.bottom() + 2,
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L.quoteAuthorRect.width(),
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qH - kQuotePadV - QFontMetrics(option.font).height() - 2 - kQuotePadV);
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contentTop += qH + kQuoteGap;
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}
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L.textRect = QRect(contentLeft + kPadH, contentTop,
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textW, textH);
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L.statusRect = QRect(contentLeft + kPadH,
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contentTop + textH + 2,
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textW, kStatusH);
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int avatarY = L.bubbleRect.bottom() - kAvatar;
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L.avatarRect = QRect(kMarginH, avatarY, kAvatar, kAvatar);
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return L;
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}
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void MessageDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
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const QModelIndex &index) const {
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painter->save();
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painter->translate(option.rect.topLeft());
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painter->setClipRect(QRect(QPoint(0, 0), option.rect.size()));
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Layout L = calcLayout(option, index);
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drawBubble(painter, L);
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if (index.data(MsgHasQuoteRole).toBool()) {
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drawQuote(painter, L, index, option);
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}
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drawAvatar(painter, L, index);
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painter->setPen(option.palette.text().color());
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QFont textFont = option.font;
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textFont.setPointSize(textFont.pointSize());
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painter->setFont(textFont);
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painter->drawText(L.textRect, Qt::AlignLeft | Qt::TextWordWrap,
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index.data(MsgTextRole).toString());
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drawStatusBar(painter, L, index, option);
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painter->restore();
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}
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void MessageDelegate::drawQuote(QPainter *p, const Layout &L,
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const QModelIndex &index,
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const QStyleOptionViewItem &opt) const {
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p->save();
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p->setPen(Qt::NoPen);
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p->setBrush(QColor(0xFF, 0xEE, 0xEE));
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p->drawRoundedRect(L.quoteRect, 5, 5);
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p->setPen(Qt::NoPen);
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p->setBrush(QColor(0xE0, 0x40, 0x40));
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p->drawRect(L.quoteBarRect);
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QFont boldFont = opt.font;
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boldFont.setBold(true);
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p->setFont(boldFont);
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p->setPen(QColor(0xE0, 0x40, 0x40));
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p->drawText(L.quoteAuthorRect, Qt::AlignLeft | Qt::AlignVCenter,
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index.data(MsgQuoteAuthorRole).toString());
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p->setFont(opt.font);
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p->setPen(QColor(0x99, 0x55, 0x55));
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p->drawText(L.quoteTextRect, Qt::AlignLeft | Qt::TextWordWrap,
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index.data(MsgQuoteTextRole).toString());
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p->restore();
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}
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void MessageDelegate::drawBubble(QPainter *p, const Layout &L) const {
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p->save();
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p->setRenderHint(QPainter::Antialiasing);
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QRectF b = L.bubbleRect;
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qreal r = kRadius;
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qreal t = kTail;
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QPainterPath body;
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body.addRoundedRect(b, r, r);
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QPainterPath tail;
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qreal tx = b.left();
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qreal ty = b.bottom();
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tail.moveTo(tx, ty - r);
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tail.lineTo(tx - t, ty - t / 2.0);
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tail.lineTo(tx + r, ty);
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tail.closeSubpath();
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QPainterPath combined = body.united(tail);
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p->setPen(QPen(QColor(0xE0, 0xE0, 0xE0), 0.5));
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p->setBrush(QColor(255, 255, 255));
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p->drawPath(combined);
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p->restore();
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}
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void MessageDelegate::drawStatusBar(QPainter *p, const Layout &L,
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const QModelIndex &index,
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const QStyleOptionViewItem &opt) const {
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p->save();
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QRect r = L.statusRect;
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QVariant reactionsVar = index.data(MsgReactionsRole);
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QVariantList reactions = reactionsVar.toList();
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int rx = r.left();
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if (!reactions.isEmpty()) {
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for (const QVariant &rv : reactions) {
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QVariantMap rm = rv.toMap();
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QString emoji = rm["emoji"].toString();
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int count = rm["count"].toInt();
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QVariant colorsVar = rm["colors"];
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QList<QColor> colors = colorsVar.value<QList<QColor>>();
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if (count < 4 && !colors.isEmpty()) {
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int iconSize = 16;
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for (int i = colors.size() - 1; i >= 0; --i) {
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int cx = rx + i * 11;
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p->setPen(Qt::NoPen);
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p->setBrush(colors[i]);
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p->drawEllipse(cx, r.top() + 1, iconSize, iconSize);
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}
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rx += colors.size() * 11 + 8;
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} else {
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QFont emojiFont = opt.font;
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emojiFont.setPointSize(emojiFont.pointSize() - 1);
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p->setFont(emojiFont);
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p->setPen(opt.palette.text().color());
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QRect emojiRect(rx, r.top(), 20, r.height());
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p->drawText(emojiRect, Qt::AlignLeft | Qt::AlignVCenter, emoji);
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rx += 20;
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QFont countFont = opt.font;
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countFont.setPointSize(countFont.pointSize() - 2);
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p->setFont(countFont);
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p->setPen(QColor(0x80, 0x80, 0x80));
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QRect cntRect(rx, r.top(), 24, r.height());
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p->drawText(cntRect, Qt::AlignLeft | Qt::AlignVCenter,
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QString::number(count));
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rx = cntRect.right() + 8;
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}
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}
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}
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QFont smallFont = opt.font;
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smallFont.setPointSize(smallFont.pointSize() - 2);
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p->setFont(smallFont);
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p->setPen(QColor(0x80, 0x80, 0x80));
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QString statusText;
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if (index.data(MsgEditedRole).toBool()) {
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statusText = QString::fromUtf8("изменено ");
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}
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statusText += index.data(MsgTimeRole).toString();
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p->drawText(QRect(r.left(), r.top(), r.width(), r.height()),
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Qt::AlignRight | Qt::AlignVCenter, statusText);
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p->restore();
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}
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void MessageDelegate::drawAvatar(QPainter *p, const Layout &L,
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const QModelIndex &index) const {
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QPixmap av = index.data(MsgAvatarRole).value<QPixmap>();
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if (av.isNull()) return;
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p->save();
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p->setRenderHint(QPainter::Antialiasing);
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QPainterPath clip;
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clip.addEllipse(L.avatarRect);
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p->setClipPath(clip);
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p->drawPixmap(L.avatarRect, av);
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p->restore();
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}
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