Initial commit of mtgonline project

C++/libcockatrice_utility/libcockatrice/utility/qt_utils.h

@@ -0,0 +1,38 @@
+#ifndef COCKATRICE_QT_UTILS_H
+#define COCKATRICE_QT_UTILS_H
+#include <QLayout>
+#include <QObject>
+
+namespace QtUtils
+{
+template <typename T> T *findParentOfType(const QObject *obj)
+{
+    const QObject *p = obj ? obj->parent() : nullptr;
+    while (p) {
+        if (auto casted = qobject_cast<T *>(const_cast<QObject *>(p))) {
+            return casted;
+        }
+        p = p->parent();
+    }
+    return nullptr;
+}
+
+static inline void clearLayoutRec(QLayout *l)
+{
+    if (!l) {
+        return;
+    }
+    QLayoutItem *it;
+    while ((it = l->takeAt(0)) != nullptr) {
+        if (QWidget *w = it->widget()) {
+            w->deleteLater();
+        }
+        if (QLayout *sub = it->layout()) {
+            clearLayoutRec(sub);
+        }
+        delete it;
+    }
+}
+} // namespace QtUtils
+
+#endif // COCKATRICE_QT_UTILS_H