changed all dialogs and popups to use diagramPanel as a parent

This makes them spawn at the center of the diagramPanel, instead of the center of the primary display of the computer

src/main/java/nl/andrewlalis/erme/control/actions/AboutAction.java

@@ -1,6 +1,8 @@
 package nl.andrewlalis.erme.control.actions;
 
+import lombok.Setter;
 import nl.andrewlalis.erme.EntityRelationMappingEditor;
+import nl.andrewlalis.erme.view.DiagramPanel;
 
 import javax.swing.*;
 import java.awt.*;
@@ -14,6 +16,9 @@ public class AboutAction extends AbstractAction {
 		return instance;
 	}
 
+	@Setter
+	private DiagramPanel diagramPanel;
+
 	public AboutAction() {
 		super("About");
 		this.putValue(SHORT_DESCRIPTION, "Show some information about this program.");
@@ -22,7 +27,7 @@ public class AboutAction extends AbstractAction {
 	@Override
 	public void actionPerformed(ActionEvent e) {
 		JOptionPane.showMessageDialog(
-				(Component) e.getSource(),
+				this.diagramPanel,
 				"Entity-Relation Mapping Editor\n" +
 						"by Andrew Lalis\n" +
 						"Version " + EntityRelationMappingEditor.VERSION + "\n" +

src/main/java/nl/andrewlalis/erme/control/actions/ExitAction.java

@@ -1,5 +1,8 @@
 package nl.andrewlalis.erme.control.actions;
 
+import lombok.Setter;
+import nl.andrewlalis.erme.view.DiagramPanel;
+
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
@@ -16,6 +19,9 @@ public class ExitAction extends AbstractAction {
 		return instance;
 	}
 
+	@Setter
+	private DiagramPanel diagramPanel;
+
 	public ExitAction() {
 		super("Exit");
 		this.putValue(Action.SHORT_DESCRIPTION, "Exit the program.");
@@ -25,7 +31,7 @@ public class ExitAction extends AbstractAction {
 	@Override
 	public void actionPerformed(ActionEvent e) {
 		int choice = JOptionPane.showConfirmDialog(
-				(Component) e.getSource(),
+				this.diagramPanel,
 				"Are you sure you want to quit?\nAll unsaved data will be lost.",
 				"Confirm Exit",
 				JOptionPane.OK_CANCEL_OPTION,

src/main/java/nl/andrewlalis/erme/control/actions/ExportToImageAction.java

@@ -34,6 +34,8 @@ public class ExportToImageAction extends AbstractAction {
 
 	@Setter
 	private MappingModel model;
+	@Setter
+	private DiagramPanel diagramPanel;
 
 	public ExportToImageAction() {
 		super("Export to Image");
@@ -45,7 +47,7 @@ public class ExportToImageAction extends AbstractAction {
 	public void actionPerformed(ActionEvent e) {
 		if (this.model.getRelations().isEmpty()) {
 			JOptionPane.showMessageDialog(
-					(Component) e.getSource(),
+					this.diagramPanel,
 					"Model is empty. Add some relations before exporting to an image.",
 					"Model Empty",
 					JOptionPane.WARNING_MESSAGE
@@ -61,7 +63,7 @@ public class ExportToImageAction extends AbstractAction {
 		if (path != null) {
 			fileChooser.setSelectedFile(new File(path));
 		}
-		int choice = fileChooser.showSaveDialog((Component) e.getSource());
+		int choice = fileChooser.showSaveDialog(this.diagramPanel);
 		if (choice == JFileChooser.APPROVE_OPTION) {
 			File chosenFile = fileChooser.getSelectedFile();
 			if (chosenFile == null || chosenFile.isDirectory()) {
@@ -82,7 +84,7 @@ public class ExportToImageAction extends AbstractAction {
 				ImageIO.write(render, extension, chosenFile);
 				prefs.put(LAST_EXPORT_LOCATION_KEY, chosenFile.getAbsolutePath());
 				JOptionPane.showMessageDialog(
-						fileChooser,
+						this.diagramPanel,
 						"Image export completed in " + String.format("%.4f", durationSeconds) + " seconds.\n" +
 								"Resolution: " + render.getWidth() + "x" + render.getHeight(),
 						"Image Export Complete",

src/main/java/nl/andrewlalis/erme/control/actions/HtmlDocumentViewerAction.java

@@ -1,5 +1,8 @@
 package nl.andrewlalis.erme.control.actions;
 
+import lombok.Setter;
+import nl.andrewlalis.erme.view.DiagramPanel;
+
 import javax.swing.*;
 import javax.swing.event.HyperlinkEvent;
 import java.awt.*;
@@ -24,10 +27,13 @@ public abstract class HtmlDocumentViewerAction extends AbstractAction {
 		this.modalityType = modalityType;
 	}
 
+	@Setter
+	private DiagramPanel diagramPanel;
+
 	@Override
 	public void actionPerformed(ActionEvent e) {
 		JDialog dialog = new JDialog(
-				SwingUtilities.getWindowAncestor((Component) e.getSource()),
+				SwingUtilities.getWindowAncestor(this.diagramPanel),
 				(String) this.getValue(NAME),
 				this.modalityType
 		);
@@ -54,7 +60,7 @@ public abstract class HtmlDocumentViewerAction extends AbstractAction {
 		} catch (IOException ex) {
 			ex.printStackTrace();
 			JOptionPane.showMessageDialog(
-					(Component) e.getSource(),
+					this.diagramPanel,
 					"An error occured:\n" + ex.getMessage(),
 					"Error",
 					JOptionPane.ERROR_MESSAGE
@@ -68,7 +74,7 @@ public abstract class HtmlDocumentViewerAction extends AbstractAction {
 		dialog.setMaximumSize(new Dimension(600, 800));
 		dialog.setPreferredSize(new Dimension(600, 800));
 		dialog.pack();
-		dialog.setLocationRelativeTo(null);
+		dialog.setLocationRelativeTo(this.diagramPanel);
 		dialog.setVisible(true);
 	}
 

src/main/java/nl/andrewlalis/erme/control/actions/LoadAction.java

@@ -49,7 +49,7 @@ public class LoadAction extends AbstractAction {
 		if (path != null) {
 			fileChooser.setSelectedFile(new File(path));
 		}
-		int choice = fileChooser.showOpenDialog((Component) e.getSource());
+		int choice = fileChooser.showOpenDialog(this.diagramPanel);
 		if (choice == JFileChooser.APPROVE_OPTION) {
 			File chosenFile = fileChooser.getSelectedFile();
 			if (chosenFile == null || chosenFile.isDirectory() || !chosenFile.exists() || !chosenFile.canRead()) {

src/main/java/nl/andrewlalis/erme/control/actions/SaveAction.java

@@ -2,6 +2,7 @@ package nl.andrewlalis.erme.control.actions;
 
 import lombok.Setter;
 import nl.andrewlalis.erme.model.MappingModel;
+import nl.andrewlalis.erme.view.DiagramPanel;
 
 import javax.swing.*;
 import javax.swing.filechooser.FileNameExtensionFilter;
@@ -28,6 +29,8 @@ public class SaveAction extends AbstractAction {
 
 	@Setter
 	private MappingModel model;
+	@Setter
+	private DiagramPanel diagramPanel;
 
 	public SaveAction() {
 		super("Save");
@@ -48,7 +51,7 @@ public class SaveAction extends AbstractAction {
 		if (path != null) {
 			fileChooser.setSelectedFile(new File(path));
 		}
-		int choice = fileChooser.showSaveDialog((Component) e.getSource());
+		int choice = fileChooser.showSaveDialog(this.diagramPanel);
 		if (choice == JFileChooser.APPROVE_OPTION) {
 			File chosenFile = fileChooser.getSelectedFile();
 			if (chosenFile == null || chosenFile.isDirectory()) {

src/main/java/nl/andrewlalis/erme/control/actions/edits/AddAttributeAction.java

@@ -2,6 +2,7 @@ package nl.andrewlalis.erme.control.actions.edits;
 
 import lombok.Setter;
 import nl.andrewlalis.erme.model.*;
+import nl.andrewlalis.erme.view.DiagramPanel;
 
 import javax.swing.*;
 import java.awt.*;
@@ -24,6 +25,8 @@ public class AddAttributeAction extends AbstractAction {
 
 	@Setter
 	private MappingModel model;
+	@Setter
+	private DiagramPanel diagramPanel;
 
 	public AddAttributeAction() {
 		super("Add Attribute");
@@ -36,7 +39,7 @@ public class AddAttributeAction extends AbstractAction {
 		List<Relation> selectedRelations = this.model.getSelectedRelations();
 		if (selectedRelations.size() != 1) {
 			JOptionPane.showMessageDialog(
-					(Component) e.getSource(),
+					this.diagramPanel,
 					"A single relation must be selected to add an attribute.",
 					"Single Relation Required",
 					JOptionPane.WARNING_MESSAGE
@@ -45,11 +48,11 @@ public class AddAttributeAction extends AbstractAction {
 		}
 		Relation r = selectedRelations.get(0);
 		Attribute createdAttribute;
-		Component c = (Component) e.getSource();
+		Component source = this.diagramPanel;
-		String name = JOptionPane.showInputDialog(c, "Enter the name of the attribute.", "Attribute Name", JOptionPane.PLAIN_MESSAGE);
+		String name = JOptionPane.showInputDialog(source, "Enter the name of the attribute.", "Attribute Name", JOptionPane.PLAIN_MESSAGE);
 		if (name == null) return;
 		Integer index = (Integer) JOptionPane.showInputDialog(
-				c,
+				source,
 				"Select the index to insert this attribute at.",
 				"Attribute Index",
 				JOptionPane.PLAIN_MESSAGE,
@@ -59,7 +62,7 @@ public class AddAttributeAction extends AbstractAction {
 		);
 		if (index == null) return;
 		AttributeType type = (AttributeType) JOptionPane.showInputDialog(
-				c,
+				source,
 				"Select the type this attribute is.",
 				"Attribute Type",
 				JOptionPane.PLAIN_MESSAGE,
@@ -69,7 +72,7 @@ public class AddAttributeAction extends AbstractAction {
 		);
 		if (type == null) return;
 		boolean shouldUseForeignKey = ((String) JOptionPane.showInputDialog(
-				c,
+				source,
 				"Is this attribute a foreign key?",
 				"Foreign Key",
 				JOptionPane.PLAIN_MESSAGE,
@@ -79,11 +82,11 @@ public class AddAttributeAction extends AbstractAction {
 		)).equalsIgnoreCase("yes");
 		if (shouldUseForeignKey) {
 			if (this.model.getRelations().size() < 2) {
-				JOptionPane.showMessageDialog(c, "There should be at least 2 relations present in the model.", "Not Enough Relations", JOptionPane.WARNING_MESSAGE);
+				JOptionPane.showMessageDialog(source, "There should be at least 2 relations present in the model.", "Not Enough Relations", JOptionPane.WARNING_MESSAGE);
 				return;
 			}
 			Relation fkRelation = (Relation) JOptionPane.showInputDialog(
-					c,
+					source,
 					"Select the relation that this foreign key references.",
 					"Foreign Key Relation Reference",
 					JOptionPane.PLAIN_MESSAGE,
@@ -94,11 +97,11 @@ public class AddAttributeAction extends AbstractAction {
 			if (fkRelation == null) return;
 			List<Attribute> eligibleAttributes = fkRelation.getAttributes();
 			if (eligibleAttributes.isEmpty()) {
-				JOptionPane.showMessageDialog(c, "There are no referencable attributes in the selected relation.", "No Referencable Attributes", JOptionPane.WARNING_MESSAGE);
+				JOptionPane.showMessageDialog(source, "There are no referencable attributes in the selected relation.", "No Referencable Attributes", JOptionPane.WARNING_MESSAGE);
 				return;
 			}
 			Attribute fkAttribute = (Attribute) JOptionPane.showInputDialog(
-					c,
+					source,
 					"Select the attribute that this foreign key references.",
 					"Foreign Key Attribute Reference",
 					JOptionPane.PLAIN_MESSAGE,

src/main/java/nl/andrewlalis/erme/control/actions/edits/AddRelationAction.java

@@ -35,9 +35,8 @@ public class AddRelationAction extends AbstractAction {
 
 	@Override
 	public void actionPerformed(ActionEvent e) {
-		Component c = (Component) e.getSource();
 		String name = JOptionPane.showInputDialog(
-				c,
+				this.diagramPanel,
 				"Enter the name of the relation.",
 				"Add Relation",
 				JOptionPane.PLAIN_MESSAGE

src/main/java/nl/andrewlalis/erme/control/actions/edits/RemoveAttributeAction.java

@@ -4,6 +4,7 @@ import lombok.Setter;
 import nl.andrewlalis.erme.model.Attribute;
 import nl.andrewlalis.erme.model.MappingModel;
 import nl.andrewlalis.erme.model.Relation;
+import nl.andrewlalis.erme.view.DiagramPanel;
 
 import javax.swing.*;
 import java.awt.*;
@@ -25,6 +26,8 @@ public class RemoveAttributeAction extends AbstractAction {
 
 	@Setter
 	private MappingModel model;
+	@Setter
+	private DiagramPanel diagramPanel;
 
 	public RemoveAttributeAction() {
 		super("Remove Attribute");
@@ -37,7 +40,7 @@ public class RemoveAttributeAction extends AbstractAction {
 		List<Relation> selectedRelations = this.model.getSelectedRelations();
 		if (selectedRelations.size() != 1 || selectedRelations.get(0).getAttributes().isEmpty()) {
 			JOptionPane.showMessageDialog(
-					(Component) e.getSource(),
+					this.diagramPanel,
 					"A single relation with at least one attribute must be selected to remove an attribute.",
 					"Single Relation With Attribute Required",
 					JOptionPane.WARNING_MESSAGE
@@ -46,7 +49,7 @@ public class RemoveAttributeAction extends AbstractAction {
 		}
 		Relation r = selectedRelations.get(0);
 		Attribute attribute = (Attribute) JOptionPane.showInputDialog(
-				(Component) e.getSource(),
+				this.diagramPanel,
 				"Select the attribute to remove.",
 				"Select Attribute",
 				JOptionPane.PLAIN_MESSAGE,

src/main/java/nl/andrewlalis/erme/control/actions/edits/RemoveRelationAction.java

@@ -3,6 +3,7 @@ package nl.andrewlalis.erme.control.actions.edits;
 import lombok.Setter;
 import nl.andrewlalis.erme.model.MappingModel;
 import nl.andrewlalis.erme.model.Relation;
+import nl.andrewlalis.erme.view.DiagramPanel;
 
 import javax.swing.*;
 import java.awt.*;
@@ -22,6 +23,8 @@ public class RemoveRelationAction extends AbstractAction {
 
 	@Setter
 	private MappingModel model;
+	@Setter
+	private DiagramPanel diagramPanel;
 
 	public RemoveRelationAction() {
 		super("Remove Relation");
@@ -33,7 +36,7 @@ public class RemoveRelationAction extends AbstractAction {
 	public void actionPerformed(ActionEvent e) {
 		if (this.model.getSelectedRelations().isEmpty()) {
 			JOptionPane.showMessageDialog(
-					(Component) e.getSource(),
+					this.diagramPanel,
 					"No relations selected. Select at least one relation to remove.",
 					"No Relations Selected",
 					JOptionPane.WARNING_MESSAGE

src/main/java/nl/andrewlalis/erme/view/DiagramPanel.java

@@ -122,13 +122,22 @@ public class DiagramPanel extends JPanel implements ModelChangeListener {
 		SaveAction.getInstance().setModel(this.model);
 		LoadAction.getInstance().setDiagramPanel(this);
 		ExportToImageAction.getInstance().setModel(this.model);
+		ExportToImageAction.getInstance().setDiagramPanel(this);
 		AddRelationAction.getInstance().setModel(this.model);
 		AddRelationAction.getInstance().setDiagramPanel(this);
 		RemoveRelationAction.getInstance().setModel(this.model);
+		RemoveRelationAction.getInstance().setDiagramPanel(this);
 		AddAttributeAction.getInstance().setModel(this.model);
+		AddAttributeAction.getInstance().setDiagramPanel(this);
 		RemoveAttributeAction.getInstance().setModel(this.model);
+		RemoveAttributeAction.getInstance().setDiagramPanel(this);
 		LoadSampleModelAction.getInstance().setDiagramPanel(this);
 		LolcatAction.getInstance().setDiagramPanel(this);
+		AboutAction.getInstance().setDiagramPanel(this);
+		ExitAction.getInstance().setDiagramPanel(this);
+		InstructionsAction.getInstance().setDiagramPanel(this);
+		MappingAlgorithmHelpAction.getInstance().setDiagramPanel(this);
+		SaveAction.getInstance().setDiagramPanel(this);
 	}
 
 	public static void prepareGraphics(Graphics2D g) {