Prevent user from entering incorrect characters in Live Notifications channels list (#3715)

Co-authored-by: Sidd <iProdigy@users.noreply.github.com>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/helper/EditableModelView.cpp

@@ -1,4 +1,5 @@
 #include "EditableModelView.hpp"
+#include "widgets/helper/RegExpItemDelegate.hpp"
 
 #include <QAbstractItemView>
 #include <QAbstractTableModel>
@@ -90,6 +91,10 @@ EditableModelView::EditableModelView(QAbstractTableModel *model, bool movable)
     // finish button layout
     buttons->addStretch(1);
 }
+void EditableModelView::setValidationRegexp(QRegularExpression regexp)
+{
+    this->tableView_->setItemDelegate(new RegExpItemDelegate(this, regexp));
+}
 
 void EditableModelView::setTitles(std::initializer_list<QString> titles)
 {

src/widgets/helper/EditableModelView.hpp

@@ -16,6 +16,7 @@ public:
     EditableModelView(QAbstractTableModel *model, bool movable = true);
 
     void setTitles(std::initializer_list<QString> titles);
+    void setValidationRegexp(QRegularExpression regexp);
 
     QTableView *getTableView();
     QAbstractTableModel *getModel();

src/widgets/helper/RegExpItemDelegate.cpp

@@ -0,0 +1,24 @@
+#include "widgets/helper/RegExpItemDelegate.hpp"
+
+#include <QLineEdit>
+
+namespace chatterino {
+
+RegExpItemDelegate::RegExpItemDelegate(QObject *parent,
+                                       QRegularExpression regexp)
+    : QStyledItemDelegate(parent)
+    , regexp_(regexp)
+{
+}
+
+QWidget *RegExpItemDelegate::createEditor(QWidget *parent,
+                                          const QStyleOptionViewItem &option,
+                                          const QModelIndex &index) const
+{
+    auto *editor = new QLineEdit(parent);
+    editor->setValidator(
+        new QRegularExpressionValidator(this->regexp_, editor));
+    return editor;
+}
+
+}  // namespace chatterino

src/widgets/helper/RegExpItemDelegate.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <QRegularExpression>
+#include <QStyledItemDelegate>
+
+namespace chatterino {
+
+class RegExpItemDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+
+public:
+    RegExpItemDelegate(QObject *parent, QRegularExpression regexp);
+
+    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
+                          const QModelIndex &index) const override;
+
+private:
+    const QRegularExpression regexp_;
+};
+
+}  // namespace chatterino

src/widgets/settingspages/NotificationPage.cpp

@@ -6,6 +6,7 @@
 #include "singletons/Settings.hpp"
 #include "singletons/Toasts.hpp"
 #include "util/LayoutCreator.hpp"
+#include "util/Twitch.hpp"
 #include "widgets/helper/EditableModelView.hpp"
 
 #include <QCheckBox>
@@ -96,6 +97,7 @@ NotificationPage::NotificationPage()
                                 nullptr, Platform::Twitch))
                         .getElement();
                 view->setTitles({"Twitch channels"});
+                view->setValidationRegexp(twitchUserNameRegexp());
 
                 view->getTableView()->horizontalHeader()->setSectionResizeMode(
                     QHeaderView::Fixed);