1 files changed, 42 insertions, 0 deletions
diff --git a/src/GraphemeCountValidator.cpp b/src/GraphemeCountValidator.cpp
new file mode 100644
index 0000000..9fc6436
--- /dev/null
+++ b/src/GraphemeCountValidator.cpp
@@ -0,0 +1,42 @@
+#include "GraphemeCountValidator.h"
+#include <QTextBoundaryFinder>
+
+GraphemeCountValidator::GraphemeCountValidator(QObject *parent)
+    : GraphemeCountValidator(0, parent)
+{}
+
+GraphemeCountValidator::GraphemeCountValidator(uint min_count, QObject *parent)
+    : QValidator(parent)
+    , minCount(min_count)
+{}
+
+uint GraphemeCountValidator::minGraphemeCount() const
+{
+    return minCount;
+}
+
+void GraphemeCountValidator::setMinGraphemeCount(uint c)
+{
+    if(minCount != c)
+    {
+        minCount = c;
+        emit minGraphemeCountChanged(minCount);
+        emit changed();
+    }
+}
+
+QValidator::State GraphemeCountValidator::validate(QString & text, int&) const
+{
+    //One could write Rust FFI bindings and do this in Rust.
+    //But that would be way more work for no gain.
+    QTextBoundaryFinder boundsFinder{
+        QTextBoundaryFinder::BoundaryType::Grapheme,
+        text
+    };
+    int requiredBoundary = 0;
+    for(uint i = 0; i < minCount; ++i)
+        requiredBoundary = boundsFinder.toNextBoundary();
+    return requiredBoundary >= 0
+            ? QValidator::State::Acceptable
+            : QValidator::State::Intermediate;
+}