tools/chatgui: Qt5 GUI chat app stub with tray, channel list, message bubbles

tools/chatgui/src/channellist.cpp

@@ -0,0 +1,82 @@
+#include "channellist.h"
+#include "channeldelegate.h"
+#include <QVBoxLayout>
+#include <QLabel>
+#include <QPainter>
+#include <QPixmap>
+
+static QIcon makeChannelIcon(const QColor &color, const QString &letter) {
+    QPixmap pix(32, 32);
+    pix.fill(Qt::transparent);
+    QPainter p(&pix);
+    p.setRenderHint(QPainter::Antialiasing);
+    p.setBrush(color);
+    p.setPen(Qt::NoPen);
+    p.drawRoundedRect(0, 0, 32, 32, 8, 8);
+    p.setPen(Qt::white);
+    QFont f = p.font();
+    f.setBold(true);
+    f.setPointSize(14);
+    p.setFont(f);
+    p.drawText(QRect(0, 0, 32, 32), Qt::AlignCenter, letter);
+    p.end();
+    return QIcon(pix);
+}
+
+ChannelList::ChannelList(QWidget *parent)
+    : QWidget(parent)
+    , m_listView(new QListView(this))
+    , m_model(new QStandardItemModel(this))
+{
+    auto *layout = new QVBoxLayout(this);
+    layout->setContentsMargins(0, 0, 0, 0);
+    layout->setSpacing(0);
+
+    auto *header = new QLabel("Channels", this);
+    header->setAlignment(Qt::AlignCenter);
+    header->setStyleSheet("font-weight: bold; padding: 8px; background: palette(window);");
+    layout->addWidget(header);
+
+    m_listView->setModel(m_model);
+    m_listView->setItemDelegate(new ChannelDelegate(this));
+    m_listView->setEditTriggers(QAbstractItemView::NoEditTriggers);
+    m_listView->setSelectionMode(QAbstractItemView::SingleSelection);
+    m_listView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    m_listView->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
+    layout->addWidget(m_listView);
+
+    connect(m_listView->selectionModel(), &QItemSelectionModel::currentChanged,
+            this, [this](const QModelIndex &current, const QModelIndex &) {
+                if (current.isValid()) {
+                    emit channelSelected(current.row());
+                }
+            });
+
+    populateStubData();
+}
+
+void ChannelList::populateStubData() {
+    struct {
+        const char *name;
+        const char *lastMsg;
+        QColor color;
+        const char *letter;
+    } channels[] = {
+        {"#general",     "Alice: Sounds good, let's deploy tomorrow morning.", QColor(74, 144, 226), "G"},
+        {"#random",      "Bob: Anyone seen the latest episode? It was amazing!", QColor(126, 211, 33), "R"},
+        {"#dev-team",    "Carol: I've pushed the fix for ETCP-42 to staging.",   QColor(245, 166, 35), "D"},
+        {"#announcements","Admin: Maintenance scheduled for Sunday 02:00 UTC.",  QColor(208, 2, 27),  "A"},
+        {"#support",     "Dave: Can someone help me configure the routing table? The BGP session keeps dropping after the handshake completes. I've checked the logs.", QColor(144, 19, 254), "S"},
+        {"#offtopic",    "Eve: Check out this new keyboard — Cherry MX Blue, 60%.", QColor(0, 184, 148), "O"},
+    };
+
+    for (const auto &ch : channels) {
+        auto *item = new QStandardItem();
+        item->setData(ch.name, ChannelNameRole);
+        item->setData(QString::fromUtf8(ch.lastMsg), ChannelLastMessageRole);
+        item->setData(makeChannelIcon(ch.color, ch.letter), ChannelIconRole);
+        m_model->appendRow(item);
+    }
+
+    m_listView->setCurrentIndex(m_model->index(0, 0));
+}