chatgui: fix Qt5 build — QMouseEvent/QWheelEvent position() -> localPos()/posF()

tools/chatgui/src/imageviewer_window.cpp

@@ -15,6 +15,22 @@
 #include <QEasingCurve>
 #include <QtMath>
 
+static QPointF mouseLocalPos(const QMouseEvent* e) {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    return e->position();
+#else
+    return e->localPos();
+#endif
+}
+
+static QPointF wheelPos(const QWheelEvent* e) {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+    return e->position();
+#else
+    return e->posF();
+#endif
+}
+
 ImageViewerWindow::ImageViewerWindow(QWidget *parent)
     : QWidget(parent)
 {
@@ -138,7 +154,7 @@ void ImageViewerWindow::wheelEvent(QWheelEvent* e) {
     if (qFuzzyCompare(newScale, m_scale)) return;
 
     /* зум в точку курсора */
-    QPointF cursor = e->position();
+    QPointF cursor = wheelPos(e);
     QPointF center((double)width() / 2.0, (double)height() / 2.0);
     double ratio = newScale / m_scale;
     m_offset = (m_offset - (cursor - center)) * ratio + (cursor - center);
@@ -151,7 +167,7 @@ void ImageViewerWindow::wheelEvent(QWheelEvent* e) {
 void ImageViewerWindow::mousePressEvent(QMouseEvent* e) {
     if (e->button() == Qt::LeftButton && m_scale > 1.0) {
         m_dragging = true;
-        m_dragStart = e->position();
+        m_dragStart = mouseLocalPos(e);
         m_offsetStart = m_offset;
         setCursor(Qt::ClosedHandCursor);
         e->accept();
@@ -163,7 +179,7 @@ void ImageViewerWindow::mousePressEvent(QMouseEvent* e) {
 void ImageViewerWindow::mouseMoveEvent(QMouseEvent* e) {
     showOverlay();
     if (m_dragging) {
-        m_offset = m_offsetStart + (e->position() - m_dragStart);
+        m_offset = m_offsetStart + (mouseLocalPos(e) - m_dragStart);
         clampOffset();
         update();
         e->accept();