Implement filter logic for topic filtering

Author: guilyx

src/publisher_select_dialog.cpp

@@ -0,0 +1,29 @@
+#include "publisher_select_dialog.h"
+#include <QStringList>
+
+void PublisherSelectDialog::on_lineEditFilter_textChanged(const QString &search_string)
+{
+  QStringList spaced_items = search_string.split(' ');
+
+  for (const auto &pair : _topic_widgets)
+  {
+    const std::string &topic_name = pair.first;
+    QLabel *label = pair.second.first;
+    QCheckBox *checkbox = pair.second.second;
+
+    QString name = QString::fromStdString(topic_name);
+    bool toHide = false;
+
+    for (const auto &item : spaced_items)
+    {
+      if (!name.contains(item, Qt::CaseInsensitive))
+      {
+        toHide = true;
+        break;
+      }
+    }
+
+    label->setVisible(!toHide);
+    checkbox->setVisible(!toHide);
+  }
+}