Support adding/removing connections via buttons

editor.cpp

         ui->comboBox_ConnectedMap->clear();
         ui->comboBox_ConnectedMap->addItems(*project->mapNames);
         ui->comboBox_ConnectedMap->blockSignals(false);
+        ui->label_NumConnections->setText(QString::number(map->connections.length()));
         setConnectionsVisibility(false);
         if (current_connection_edit_item) {
             onConnectionOffsetChanged(current_connection_edit_item->connection->offset.toInt());
 }
 
 void Editor::onConnectionItemSelected(ConnectionPixmapItem* connectionItem) {
+    if (!connectionItem)
+        return;
+
     for (ConnectionPixmapItem* item : connection_edit_items) {
         bool isSelectedItem = item == connectionItem;
         int zValue = isSelectedItem ? 0 : -1;
         if (connection->direction == "dive" || connection->direction == "emerge") {
             continue;
         }
-        Map *connected_map = project->getMap(connection->map_name);
-        QPixmap pixmap = connected_map->renderConnection(*connection);
-        int offset = connection->offset.toInt(nullptr, 0);
-        int x = 0, y = 0;
-        if (connection->direction == "up") {
-            x = offset * 16;
-            y = -pixmap.height();
-        } else if (connection->direction == "down") {
-            x = offset * 16;
-            y = map->getHeight() * 16;
-        } else if (connection->direction == "left") {
-            x = -pixmap.width();
-            y = offset * 16;
-        } else if (connection->direction == "right") {
-            x = map->getWidth() * 16;
-            y = offset * 16;
-        }
-
-        QGraphicsPixmapItem *item = new QGraphicsPixmapItem(pixmap);
-        item->setZValue(-1);
-        item->setX(x);
-        item->setY(y);
-        scene->addItem(item);
-        map->connection_items.append(item);
-
-        ConnectionPixmapItem *connection_edit_item = new ConnectionPixmapItem(pixmap, connection, x, y);
-        connection_edit_item->setX(x);
-        connection_edit_item->setY(y);
-        connection_edit_item->setZValue(-1);
-        scene->addItem(connection_edit_item);
-        connect(connection_edit_item, SIGNAL(connectionMoved(int)), this, SLOT(onConnectionOffsetChanged(int)));
-        connect(connection_edit_item, SIGNAL(connectionItemSelected(ConnectionPixmapItem*)), this, SLOT(onConnectionItemSelected(ConnectionPixmapItem*)));
-        connection_edit_items.append(connection_edit_item);
+        createConnectionItem(connection, false);
     }
 
     if (!connection_edit_items.empty()) {
     }
 }
 
+void Editor::createConnectionItem(Connection* connection, bool hide) {
+    Map *connected_map = project->getMap(connection->map_name);
+    QPixmap pixmap = connected_map->renderConnection(*connection);
+    int offset = connection->offset.toInt(nullptr, 0);
+    int x = 0, y = 0;
+    if (connection->direction == "up") {
+        x = offset * 16;
+        y = -pixmap.height();
+    } else if (connection->direction == "down") {
+        x = offset * 16;
+        y = map->getHeight() * 16;
+    } else if (connection->direction == "left") {
+        x = -pixmap.width();
+        y = offset * 16;
+    } else if (connection->direction == "right") {
+        x = map->getWidth() * 16;
+        y = offset * 16;
+    }
+
+    QGraphicsPixmapItem *item = new QGraphicsPixmapItem(pixmap);
+    item->setZValue(-1);
+    item->setX(x);
+    item->setY(y);
+    scene->addItem(item);
+    map->connection_items.append(item);
+    item->setVisible(!hide);
+
+    ConnectionPixmapItem *connection_edit_item = new ConnectionPixmapItem(pixmap, connection, x, y);
+    connection_edit_item->setX(x);
+    connection_edit_item->setY(y);
+    connection_edit_item->setZValue(-1);
+    scene->addItem(connection_edit_item);
+    connect(connection_edit_item, SIGNAL(connectionMoved(int)), this, SLOT(onConnectionOffsetChanged(int)));
+    connect(connection_edit_item, SIGNAL(connectionItemSelected(ConnectionPixmapItem*)), this, SLOT(onConnectionItemSelected(ConnectionPixmapItem*)));
+    connection_edit_items.append(connection_edit_item);
+}
+
 void Editor::displayMapBorder() {
     QPixmap pixmap = map->renderBorder();
     for (int y = -6; y < map->getHeight() + 6; y += 2)
         return;
 
     if (mapName.isEmpty()) {
-        map->connections.removeOne(current_connection_edit_item->connection);
-        connection_edit_items.removeOne(current_connection_edit_item);
-        scene->removeItem(current_connection_edit_item);
-        delete current_connection_edit_item;
-        current_connection_edit_item = NULL;
-        setConnectionEditControlsEnabled(false);
-        ui->spinBox_ConnectionOffset->setValue(0);
+        removeCurrentConnection();
         return;
     } else {
         setConnectionEditControlsEnabled(true);
     setCurrentConnectionDirection(direction);
 }
 
+void Editor::addNewConnection() {
+    // Find direction with least number of connections.
+    QMap<QString, int> directionCounts = QMap<QString, int>({{"up", 0}, {"right", 0}, {"down", 0}, {"left", 0}});
+    for (Connection* connection : map->connections) {
+        directionCounts[connection->direction]++;
+    }
+    QString minDirection = "up";
+    int minCount = INT_MAX;
+    for (QString direction : directionCounts.keys()) {
+        if (directionCounts[direction] < minCount) {
+            minDirection = direction;
+            minCount = directionCounts[direction];
+        }
+    }
+
+    Connection* newConnection = new Connection;
+    newConnection->direction = minDirection;
+    newConnection->offset = "0";
+    newConnection->map_name = project->mapNames->first();
+    map->connections.append(newConnection);
+    createConnectionItem(newConnection, true);
+    onConnectionItemSelected(connection_edit_items.last());
+    ui->label_NumConnections->setText(QString::number(map->connections.length()));
+}
+
+void Editor::removeCurrentConnection() {
+    if (!current_connection_edit_item)
+        return;
+
+    map->connections.removeOne(current_connection_edit_item->connection);
+    connection_edit_items.removeOne(current_connection_edit_item);
+    scene->removeItem(current_connection_edit_item);
+    delete current_connection_edit_item;
+    current_connection_edit_item = NULL;
+    setConnectionEditControlsEnabled(false);
+    ui->spinBox_ConnectionOffset->setValue(0);
+    ui->label_NumConnections->setText(QString::number(map->connections.length()));
+
+    if (connection_edit_items.length() > 0) {
+        onConnectionItemSelected(connection_edit_items.last());
+    }
+}
+
 void MetatilesPixmapItem::paintTileChanged(Map *map) {
     draw();
 }

editor.h

     void setConnectionsVisibility(bool visible);
     void updateConnectionOffset(int offset);
     void updateConnectionMap(QString mapName, QString direction);
+    void addNewConnection();
+    void removeCurrentConnection();
 
     DraggablePixmapItem *addMapObject(Event *event);
     void selectMapObject(DraggablePixmapItem *object);
     void setBorderItemsVisible(bool, qreal = 1);
     void setConnectionEditControlValues(Connection*);
     void setConnectionEditControlsEnabled(bool);
+    void createConnectionItem(Connection* connection, bool hide);
 
 private slots:
     void mouseEvent_map(QGraphicsSceneMouseEvent *event, MapPixmapItem *item);

mainwindow.cpp

 {
     editor->updateConnectionMap(mapName, ui->comboBox_ConnectionDirection->currentText().toLower());
 }
+
+void MainWindow::on_pushButton_AddConnection_clicked()
+{
+    editor->addNewConnection();
+}
+
+void MainWindow::on_pushButton_RemoveConnection_clicked()
+{
+    editor->removeCurrentConnection();
+}

mainwindow.h

 
     void on_comboBox_ConnectedMap_currentTextChanged(const QString &mapName);
 
+    void on_pushButton_AddConnection_clicked();
+
+    void on_pushButton_RemoveConnection_clicked();
+
 private:
     Ui::MainWindow *ui;
     QStandardItemModel *mapListModel;

mainwindow.ui

         </sizepolicy>
        </property>
        <property name="currentIndex">
-        <number>0</number>
+        <number>3</number>
        </property>
        <property name="tabsClosable">
         <bool>false</bool>
             <property name="spacing">
              <number>0</number>
             </property>
-            <item row="0" column="0">
+            <item row="1" column="0">
              <widget class="QFrame" name="horizontalFrame">
               <property name="sizePolicy">
                <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
               </layout>
              </widget>
             </item>
-            <item row="1" column="0">
+            <item row="2" column="0">
              <widget class="QFrame" name="gridFrame">
               <property name="frameShape">
                <enum>QFrame::StyledPanel</enum>
                     <x>0</x>
                     <y>0</y>
                     <width>826</width>
-                    <height>621</height>
+                    <height>587</height>
                    </rect>
                   </property>
                   <layout class="QGridLayout" name="gridLayout_14">
               </layout>
              </widget>
             </item>
+            <item row="0" column="0">
+             <widget class="QFrame" name="horizontalFrame">
+              <property name="sizePolicy">
+               <sizepolicy hsizetype="Expanding" vsizetype="Fixed">
+                <horstretch>0</horstretch>
+                <verstretch>0</verstretch>
+               </sizepolicy>
+              </property>
+              <property name="minimumSize">
+               <size>
+                <width>0</width>
+                <height>32</height>
+               </size>
+              </property>
+              <property name="frameShape">
+               <enum>QFrame::StyledPanel</enum>
+              </property>
+              <property name="frameShadow">
+               <enum>QFrame::Raised</enum>
+              </property>
+              <layout class="QHBoxLayout" name="horizontalLayout_4">
+               <property name="spacing">
+                <number>4</number>
+               </property>
+               <property name="leftMargin">
+                <number>4</number>
+               </property>
+               <property name="topMargin">
+                <number>4</number>
+               </property>
+               <property name="rightMargin">
+                <number>4</number>
+               </property>
+               <property name="bottomMargin">
+                <number>4</number>
+               </property>
+               <item>
+                <widget class="QPushButton" name="pushButton_AddConnection">
+                 <property name="sizePolicy">
+                  <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
+                   <horstretch>0</horstretch>
+                   <verstretch>0</verstretch>
+                  </sizepolicy>
+                 </property>
+                 <property name="text">
+                  <string/>
+                 </property>
+                 <property name="icon">
+                  <iconset>
+                   <activeon>:/icons/add.ico</activeon>
+                  </iconset>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QPushButton" name="pushButton_RemoveConnection">
+                 <property name="text">
+                  <string/>
+                 </property>
+                 <property name="icon">
+                  <iconset>
+                   <activeon>:/icons/delete.ico</activeon>
+                  </iconset>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QLabel" name="label_13">
+                 <property name="text">
+                  <string>Number of Connections:</string>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <widget class="QLabel" name="label_NumConnections">
+                 <property name="text">
+                  <string/>
+                 </property>
+                </widget>
+               </item>
+               <item>
+                <spacer name="horizontalSpacer_9">
+                 <property name="orientation">
+                  <enum>Qt::Horizontal</enum>
+                 </property>
+                 <property name="sizeHint" stdset="0">
+                  <size>
+                   <width>40</width>
+                   <height>20</height>
+                  </size>
+                 </property>
+                </spacer>
+               </item>
+              </layout>
+             </widget>
+            </item>
            </layout>
           </widget>
          </item>