Add method to get all fields in a given area of an U_TLAY block

src/lib/uic9183/uic9183ticketlayout.cpp

@@ -197,3 +197,21 @@ QSize Uic9183TicketLayout::size() const
     }
     return QSize(width, height);
 }
+
+std::vector<Uic9183TicketLayoutField> Uic9183TicketLayout::fields(int row, int column, int width, int height) const
+{
+    std::vector<Uic9183TicketLayoutField> result;
+    for (auto f = firstField(); !f.isNull(); f = f.next()) {
+        // there's non-compliant samples out there with zero field sizes...
+        const auto effectiveHeight = std::max(f.height(), 1);
+        if (f.row() + effectiveHeight - 1 < row || f.row() > row + height - 1) {
+            continue;
+        }
+        const auto effectiveFieldWidth = f.width() > 0 ? f.width() : f.size();
+        if (f.column() + effectiveFieldWidth - 1 < column || f.column() > column + width - 1) {
+            continue;
+        }
+        result.push_back(f);
+    }
+    return result;
+}

src/lib/uic9183/uic9183ticketlayout.h

@@ -96,6 +96,9 @@ public:
      */
     Uic9183TicketLayoutField firstField() const;
 
+    /** All fields covering the given area. */
+    std::vector<Uic9183TicketLayoutField> fields(int row, int column, int width, int height) const;
+
     static constexpr const char RecordId[] = "U_TLAY";
 private:
     QExplicitlySharedDataPointer<Uic9183TicketLayoutPrivate> d;