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

tools/chatgui/src/chatview.cpp

@@ -0,0 +1,34 @@
+#include "chatview.h"
+#include <QPainter>
+#include <QDebug>
+
+ChatView::ChatView(QWidget *parent)
+    : QListView(parent)
+{
+}
+
+void ChatView::setBackgroundImage(const QString &path) {
+    if (!m_background.load(path)) {
+        qWarning() << "ChatView: failed to load background" << path;
+        return;
+    }
+    viewport()->update();
+}
+
+void ChatView::resizeEvent(QResizeEvent *event) {
+    QListView::resizeEvent(event);
+    scheduleDelayedItemsLayout();
+}
+
+void ChatView::scrollContentsBy(int dx, int dy) {
+    QListView::scrollContentsBy(dx, dy);
+    viewport()->update();
+}
+
+void ChatView::paintEvent(QPaintEvent *event) {
+    if (!m_background.isNull()) {
+        QPainter p(viewport());
+        p.drawTiledPixmap(viewport()->rect(), m_background);
+    }
+    QListView::paintEvent(event);
+}