Added initial value map model

app/CMakeLists.txt

@@ -57,6 +57,7 @@ set(MM_SRCS
     featuresmodel.cpp
     fieldsmodel.cpp
     filter/uniquevaluesfiltermodel.cpp
+    filter/valuemapfiltermodel.cpp
     filtercontroller.cpp
     guidelinecontroller.cpp
     hapticsmodel.cpp
@@ -150,6 +151,7 @@ set(MM_HDRS
     featuresmodel.h
     fieldsmodel.h
     filter/uniquevaluesfiltermodel.h
+    filter/valuemapfiltermodel.h
     filtercontroller.h
     guidelinecontroller.h
     hapticsmodel.h

app/filter/valuemapfiltermodel.cpp

@@ -0,0 +1,120 @@
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#include "valuemapfiltermodel.h"
+
+ValueMapFilterModel::ValueMapFilterModel( QObject *parent )
+  : QAbstractListModel( parent )
+{
+}
+
+int ValueMapFilterModel::rowCount( const QModelIndex &parent ) const
+{
+  Q_UNUSED( parent )
+  return mFilteredItems.size();
+}
+
+QVariant ValueMapFilterModel::data( const QModelIndex &index, int role ) const
+{
+  if ( !index.isValid() || index.row() >= mFilteredItems.size() )
+    return {};
+
+  const Item &item = mFilteredItems.at( index.row() );
+
+  switch ( role )
+  {
+    case Qt::DisplayRole:
+    case TextRole:
+      return item.text;
+    case ValueRole:
+      return item.value;
+    default:
+      return {};
+  }
+}
+
+QHash<int, QByteArray> ValueMapFilterModel::roleNames() const
+{
+  return
+  {
+    { TextRole, "text" },
+    { ValueRole, "value" },
+  };
+}
+
+QVariantMap ValueMapFilterModel::config() const
+{
+  return mConfig;
+}
+
+void ValueMapFilterModel::setConfig( const QVariantMap &config )
+{
+  if ( mConfig == config )
+    return;
+
+  mConfig = config;
+  emit configChanged();
+
+  populate();
+}
+
+QString ValueMapFilterModel::searchText() const
+{
+  return mSearchText;
+}
+
+void ValueMapFilterModel::setSearchText( const QString &searchText )
+{
+  if ( mSearchText == searchText )
+    return;
+
+  mSearchText = searchText;
+  emit searchTextChanged();
+
+  applyFilter();
+}
+
+void ValueMapFilterModel::populate()
+{
+  mItems.clear();
+
+  const QVariantList mapList = mConfig.value( QStringLiteral( "map" ) ).toList();
+  mItems.reserve( mapList.size() );
+
+  for ( const QVariant &entry : mapList )
+  {
+    const QVariantMap entryMap = entry.toMap();
+    if ( entryMap.isEmpty() )
+      continue;
+
+    // Each entry is a single-key map: {"Display Text": "stored_value"}
+    Item item;
+    item.text = entryMap.constBegin().key();
+    item.value = entryMap.constBegin().value().toString();
+    mItems.append( item );
+  }
+
+  applyFilter();
+}
+
+void ValueMapFilterModel::applyFilter()
+{
+  beginResetModel();
+  mFilteredItems.clear();
+
+  for ( const Item &item : std::as_const( mItems ) )
+  {
+    if ( mSearchText.isEmpty() || item.text.contains( mSearchText, Qt::CaseInsensitive ) )
+    {
+      mFilteredItems.append( item );
+    }
+  }
+
+  endResetModel();
+}

app/filter/valuemapfiltermodel.h

@@ -0,0 +1,69 @@
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ ***************************************************************************/
+
+#ifndef VALUEMAPFILTERMODEL_H
+#define VALUEMAPFILTERMODEL_H
+
+#include <QAbstractListModel>
+#include <QtQml/qqmlregistration.h>
+
+/**
+ * Populates a list model from a QGIS ValueMap editor widget config.
+ * Exposes TextRole (display label) and ValueRole (stored key) for each entry.
+ */
+class ValueMapFilterModel : public QAbstractListModel
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY( QVariantMap config READ config WRITE setConfig NOTIFY configChanged )
+    Q_PROPERTY( QString searchText READ searchText WRITE setSearchText NOTIFY searchTextChanged )
+
+  public:
+    enum Roles
+    {
+      TextRole = Qt::UserRole + 1,
+      ValueRole
+    };
+    Q_ENUM( Roles )
+
+    explicit ValueMapFilterModel( QObject *parent = nullptr );
+    ~ValueMapFilterModel() override = default;
+
+    int rowCount( const QModelIndex &parent = QModelIndex() ) const override;
+    QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const override;
+    QHash<int, QByteArray> roleNames() const override;
+
+    QVariantMap config() const;
+    void setConfig( const QVariantMap &config );
+
+    QString searchText() const;
+    void setSearchText( const QString &searchText );
+
+  signals:
+    void configChanged();
+    void searchTextChanged();
+
+  private:
+    void populate();
+    void applyFilter();
+
+    struct Item
+    {
+      QString text;
+      QString value;
+    };
+
+    QVariantMap mConfig;
+    QString mSearchText;
+    QList<Item> mItems;
+    QList<Item> mFilteredItems;
+};
+
+#endif // VALUEMAPFILTERMODEL_H