[fixes #244] Implement multi-selection for motor mounts

This does not have a direct effect yet. Once multi-component selection is implemented from #358, this will work

swing/src/net/sf/openrocket/gui/main/BasicFrame.java

@@ -1694,6 +1694,11 @@ public class BasicFrame extends JFrame {
 		this.selectionModel.setSelectedComponent(component);
 	}
 
+	public void setSelectedComponents(List<RocketComponent> components) {
+		this.selectionModel.setSelectedComponents(components);
+	}
+
+
 	public void stateChanged(ChangeEvent e) {
 		JTabbedPane tabSource = (JTabbedPane) e.getSource();
 		int tab = tabSource.getSelectedIndex();

swing/src/net/sf/openrocket/gui/main/DocumentSelectionModel.java

@@ -2,6 +2,7 @@ package net.sf.openrocket.gui.main;
 
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.LinkedList;
 import java.util.List;
 
 import javax.swing.ListSelectionModel;
@@ -29,7 +30,7 @@ public class DocumentSelectionModel {
 	
 	private final OpenRocketDocument document;
 	
-	private RocketComponent componentSelection = null;
+	private final List<RocketComponent> componentSelection = new LinkedList<>();
 	private Simulation[] simulationSelection = NO_SIMULATION;
 
 	private TreeSelectionModel componentTreeSelectionModel = null; 
@@ -72,23 +73,33 @@ public class DocumentSelectionModel {
 
 	/**
 	 * Return the currently selected rocket component.  Returns <code>null</code>
-	 * if no rocket component is selected.
+	 * if no rocket component is selected. If there is more than one component selected,
+	 * the first selected component is returned.
 	 * 
 	 * @return	the currently selected rocket component, or <code>null</code>.
 	 */
 	public RocketComponent getSelectedComponent() {
-		return componentSelection;
+		if (componentSelection == null || componentSelection.size() == 0) return null;
+		return componentSelection.get(0);
 	}
 	
 	public void setSelectedComponent(RocketComponent component) {
-		componentSelection = component;
+		componentSelection.clear();
+		componentSelection.add(component);
 		clearSimulationSelection();
 	
 		TreePath path = ComponentTreeModel.makeTreePath(component);
 		componentTreeSelectionModel.setSelectionPath(path);
 	}
 
+	public void setSelectedComponents(List<RocketComponent> components) {
+		componentSelection.clear();
+		componentSelection.addAll(components);
+		clearSimulationSelection();
 
+		List<TreePath> paths = ComponentTreeModel.makeTreePaths(components);
+		componentTreeSelectionModel.setSelectionPaths(paths.toArray(new TreePath[0]));
+	}
 
 	
 
@@ -131,10 +142,10 @@ public class DocumentSelectionModel {
 	
 	
 	public void clearComponentSelection() {
-		if (componentSelection == null)
+		if (componentSelection == null || componentSelection.size() == 0)
 			return;
 		
-		componentSelection = null;
+		componentSelection.clear();
 		if (componentTreeSelectionModel != null)
 			componentTreeSelectionModel.clearSelection();
 		
@@ -168,12 +179,13 @@ public class DocumentSelectionModel {
 		public void valueChanged(TreeSelectionEvent e) {
 			TreePath path = componentTreeSelectionModel.getSelectionPath();
 			if (path == null) {
-				componentSelection = null;
+				componentSelection.clear();
 				fireDocumentSelection(DocumentSelectionListener.COMPONENT_SELECTION_CHANGE);
 				return;
 			}
 
-			componentSelection = (RocketComponent)path.getLastPathComponent();
+			componentSelection.clear();
+			componentSelection.add((RocketComponent)path.getLastPathComponent());
 			
 			clearSimulationSelection();
 			fireDocumentSelection(DocumentSelectionListener.COMPONENT_SELECTION_CHANGE);

swing/src/net/sf/openrocket/gui/main/componenttree/ComponentTreeModel.java

@@ -200,6 +200,21 @@ public class ComponentTreeModel implements TreeModel, ComponentChangeListener {
 		return new TreePath(list.toArray());
 	}
 
+	/**
+	 * Return TreePaths corresponding to the specified rocket components.
+	 *
+	 * @param components	the rocket components
+	 * @return				a list of TreePaths corresponding to the different RocketComponents (one path for each component)
+	 */
+	public static List<TreePath> makeTreePaths(List<RocketComponent> components) {
+		List<TreePath> result = new LinkedList<>();
+
+		for (RocketComponent component : components) {
+			result.add(makeTreePath(component));
+		}
+		return result;
+	}
+	
 	
 	/**
 	 * Return a string describing the path, using component normal names.

swing/src/net/sf/openrocket/gui/main/flightconfigpanel/FlightConfigurationPanel.java

@@ -297,6 +297,10 @@ public class FlightConfigurationPanel extends JPanel implements StateChangeListe
 		this.basicFrame.setSelectedComponent(component);
 	}
 
+	public void setSelectedComponents(List<RocketComponent> components) {
+		this.basicFrame.setSelectedComponents(components);
+	}
+
 	@Override
 	public void stateChanged(EventObject e) {
 		updateButtonState();

swing/src/net/sf/openrocket/gui/main/flightconfigpanel/MotorConfigurationPanel.java

@@ -45,6 +45,7 @@ import net.sf.openrocket.rocketcomponent.MotorMount;
 import net.sf.openrocket.rocketcomponent.Rocket;
 import net.sf.openrocket.rocketcomponent.RocketComponent;
 import net.sf.openrocket.unit.UnitGroup;
+import net.sf.openrocket.util.ArrayList;
 import net.sf.openrocket.util.Chars;
 
 @SuppressWarnings("serial")
@@ -237,12 +238,18 @@ public class MotorConfigurationPanel extends FlightConfigurablePanel<MotorMount>
 		if (e.getValueIsAdjusting()) {
 			return;
 		}
-		MotorMount mount = getSelectedComponent();
+		List<MotorMount> mounts = getSelectedComponents();
+		if (mounts == null || mounts.size() == 0) return;
+		List<RocketComponent> components = new ArrayList<>();
+		for (MotorMount mount : mounts) {
 			if (mount instanceof RocketComponent) {
-			flightConfigurationPanel.setSelectedComponent((RocketComponent) mount);
+				components.add((RocketComponent) mount);
 			}
 		}
 
+		flightConfigurationPanel.setSelectedComponents(components);
+	}
+
 	protected void updateButtonState() {
 		if( configurationTableModel.getColumnCount() > 1 ) {
 			showContent();