Implement sorting and filtering in contact group editor

BUG: 430789

src/akonadi-contacts/contactgroupeditor.cpp

@@ -149,6 +149,7 @@ void ContactGroupEditor::Private::itemChanged(const Item &item, const QSet<QByte
 
 void ContactGroupEditor::Private::loadContactGroup(const KContacts::ContactGroup &group)
 {
+    mGui.membersView->setSortingEnabled(false);
     mGui.groupName->setText(group.name());
 
     mGroupModel->loadContactGroup(group);
@@ -161,6 +162,7 @@ void ContactGroupEditor::Private::loadContactGroup(const KContacts::ContactGroup
     }
 
     mGui.membersView->header()->resizeSections(QHeaderView::Stretch);
+    mGui.membersView->setSortingEnabled(true);
 }
 
 bool ContactGroupEditor::Private::storeContactGroup(KContacts::ContactGroup &group)
@@ -208,7 +210,12 @@ ContactGroupEditor::ContactGroupEditor(Mode mode, QWidget *parent)
     d->mGui.membersView->setEditTriggers(QAbstractItemView::AllEditTriggers);
 
     d->mGroupModel = new ContactGroupModel(this);
-    d->mGui.membersView->setModel(d->mGroupModel);
+    auto proxyModel = new GroupFilterModel(this);
+    proxyModel->setSourceModel(d->mGroupModel);
+    connect(d->mGui.searchField, &QLineEdit::textChanged, this, [proxyModel](const QString &text) {
+        proxyModel->setFilterRegularExpression(text);
+    });
+    d->mGui.membersView->setModel(proxyModel);
     d->mGui.membersView->setItemDelegate(new ContactGroupEditorDelegate(d->mGui.membersView, this));
 
     if (mode == CreateMode) {

src/akonadi-contacts/contactgroupeditor.ui

@@ -48,6 +48,16 @@
     </widget>
    </item>
    <item row="3" column="0" colspan="2">
+    <widget class="QLineEdit" name="searchField">
+     <property name="placeholderText">
+      <string>Search...</string>
+     </property>
+     <property name="clearButtonEnabled">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
+   <item row="4" column="0" colspan="2">
     <widget class="QTreeView" name="membersView">
      <property name="rootIsDecorated">
       <bool>false</bool>

src/akonadi-contacts/contactgroupmodel.cpp

@@ -448,4 +448,33 @@ bool ContactGroupModel::removeRows(int row, int count, const QModelIndex &parent
     return true;
 }
 
+GroupFilterModel::GroupFilterModel(QObject *parent)
+    : QSortFilterProxyModel(parent)
+{
+    setFilterCaseSensitivity(Qt::CaseInsensitive);
+    setFilterKeyColumn(-1);
+}
+
+bool GroupFilterModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
+{
+    if (sourceRow == sourceModel()->rowCount() - 1) {
+        return true;
+    }
+
+    return QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent);
+}
+
+bool GroupFilterModel::lessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    if (left.row() == sourceModel()->rowCount() - 1) {
+        return true;
+    }
+
+    if (right.row() == sourceModel()->rowCount() - 1) {
+        return false;
+    }
+
+    return QSortFilterProxyModel::lessThan(left, right);
+}
+
 #include "moc_contactgroupmodel_p.cpp"

src/akonadi-contacts/contactgroupmodel_p.h

@@ -9,6 +9,7 @@
 #pragma once
 
 #include <QAbstractItemModel>
+#include <QSortFilterProxyModel>
 
 #include <kcontacts/contactgroup.h>
 
@@ -44,5 +45,14 @@ private:
     class Private;
     Private *const d;
 };
-}
 
+class GroupFilterModel : public QSortFilterProxyModel
+{
+public:
+    explicit GroupFilterModel(QObject *parent = nullptr);
+
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override;
+    bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
+};
+
+}