Added about page, and better file operation.

dub.json

@@ -4,7 +4,8 @@
 	],
 	"copyright": "Copyright © 2022, Andrew Lalis",
 	"dependencies": {
-		"gtk-d": "~>3.10.0"
+		"gtk-d": "~>3.10.0",
+		"dsh": "~>1.6.1"
 	},
 	"stringImportPaths": [
 		"resources"

dub.selections.json

@@ -1,6 +1,7 @@
 {
 	"fileVersion": 1,
 	"versions": {
+		"dsh": "1.6.1",
 		"gtk-d": "3.10.0"
 	}
 }

resources/todo-ui.glade

@@ -107,6 +107,7 @@
                         <property name="can_focus">False</property>
                         <property name="use_underline">True</property>
                         <property name="use_stock">True</property>
+                        <signal name="activate" handler="onAboutMenuActivated" swapped="no"/>
                       </object>
                     </child>
                   </object>

source/app.d

@@ -2,6 +2,9 @@ import model;
 
 import std.stdio;
 import std.functional : toDelegate;
+import dsh : getHomeDir;
+import std.path;
+import std.file;
 
 import gtk.MainWindow;
 import gtk.Main;
@@ -63,6 +66,7 @@ void main(string[] args) {
 	builder.addCallbackSymbol("onSaveAsMenuActivated", &onSaveAsMenuActivated);
 	builder.addCallbackSymbol("onOpenMenuActivated", &onOpenMenuActivated);
 	builder.addCallbackSymbol("onQuitMenuActivated", &onWindowDestroy);
+	builder.addCallbackSymbol("onAboutMenuActivated", &onAboutMenuActivated);
 	builder.connectSignals(null);
 
 	taskList = cast(ListBox) builder.getObject("taskList");
@@ -71,14 +75,33 @@ void main(string[] args) {
 	taskEntry = cast(Entry) builder.getObject("addTaskEntry");
 
 	todoModel = new ToDoModel();
-	todoModel.addListener(ModelUpdateListener.of(toDelegate(&itemsUpdated)));
+	string lastOpenPath = buildPath(getHomeDir(), ".config/todo-d/last-open.txt");
+	if (exists(lastOpenPath)) {
+		import std.string : strip;
+		string lastOpenFile = readText(lastOpenPath).strip;
+		todoModel.openFromJson(lastOpenFile);
+	}
 
 	window = cast(ApplicationWindow) builder.getObject("window");
+	auto listener = new UIModelUpdateListener(window);
+	todoModel.addListener(listener);
+
+	// Trigger UI updates once before rendering the window.
+	todoModel.notifyListeners();
+	listener.fileUpdated(todoModel.getOpenFilename());
+
 	window.showAll();
 	Main.run();
 }
 
-void itemsUpdated(ToDoItem[] items) {
+class UIModelUpdateListener : ModelUpdateListener {
+	private ApplicationWindow window;
+
+	this(ApplicationWindow window) {
+		this.window = window;
+	}
+
+	void itemsUpdated(ToDoItem[] items) {
 		taskList.removeAll();
 		foreach (item; items) {
 			auto widget = new ToDoItemWidget(item, todoModel);
@@ -89,6 +112,16 @@ void itemsUpdated(ToDoItem[] items) {
 			taskList.add(row);
 		}
 		taskList.showAll();
+	}
+
+    void fileUpdated(string filename) {
+		if (filename is null) {
+			window.setTitle("todo-d");
+		} else {
+			window.setTitle("todo-d - " ~ filename);
+		}
+		window.showAll();
+	}
 }
 
 bool taskListKeyPressed(GdkEventKey* event, Widget w) {
@@ -146,6 +179,12 @@ extern (C) void onWindowDestroy() {
 	Main.quit();
 	if (todoModel.getOpenFilename() !is null) {
 		todoModel.saveToJson(todoModel.getOpenFilename());
+		string configPath = buildPath(getHomeDir(), ".config/todo-d/");
+		if (!exists(configPath)) {
+			mkdirRecurse(configPath);
+		}
+		string lastOpenFile = buildPath(configPath, "last-open.txt");
+		std.file.write(lastOpenFile, todoModel.getOpenFilename());
 	}
 }
 
@@ -191,3 +230,15 @@ extern (C) void onOpenMenuActivated() {
 	}
 	dialog.close();
 }
+
+extern (C) void onAboutMenuActivated() {
+	import gtk.AboutDialog;
+	AboutDialog dialog = new AboutDialog();
+	dialog.setProgramName("Todo-D");
+	dialog.setLicenseType(GtkLicense.MIT_X11);
+	dialog.setAuthors(["Andrew Lalis"]);
+	dialog.setComments("A simple To-Do app written in D using GTK.");
+	dialog.setWebsite("https://github.com/andrewlalis/todo-d");
+	dialog.run();
+	dialog.destroy();
+}

source/model.d

@@ -13,14 +13,7 @@ class ToDoItem {
 
 interface ModelUpdateListener {
     void itemsUpdated(ToDoItem[] items);
-
-    static ModelUpdateListener of(void delegate(ToDoItem[]) dg) {
-        return new class ModelUpdateListener {
-            void itemsUpdated(ToDoItem[] items) {
-                dg(items);
-            }
-        };
-    }
+    void fileUpdated(string filename);
 }
 
 class ToDoModel {
@@ -108,7 +101,10 @@ class ToDoModel {
             );
             items ~= item;
         }
+        if (openFilename != filename) {
             openFilename = filename;
+            foreach (l; listeners) l.fileUpdated(filename);
+        }
         sort!((a, b) => a.priority < b.priority)(items);
         normalizePrio();
         notifyListeners();
@@ -128,12 +124,16 @@ class ToDoModel {
         }
         j["items"] = JSONValue(itemObjs);
         write(filename, toJSON(j, true));
+        if (openFilename != filename) {
             openFilename = filename;
+            foreach (l; listeners) l.fileUpdated(filename);
+        }
     }
 
     void clear() {
         items = [];
         openFilename = null;
+        foreach (l; listeners) l.fileUpdated(openFilename);
         notifyListeners();
     }