Fixes #12

app/src/main/java/gui/menu/SudokuView.java

@@ -22,6 +22,8 @@ public class SudokuView extends BaseView {
 	private String lastSavePath = null;
 
 	private boolean resolved = false;
+	// if the solver can't solve
+	private volatile boolean unresolved = false;
 
 	public SudokuView(StateMachine stateMachine, MultiDoku doku) {
 		super(stateMachine);
@@ -80,10 +82,16 @@ public class SudokuView extends BaseView {
 		}
 	}
 
+	private void renderUnsolvableText() {
+		if (this.unresolved)
+			ImGui.text("Impossible de résoudre avec l'algorithme actuel !");
+
+	}
+
 	private void startSolve(Solver solver) {
 		resolveThread = new Thread(() -> {
 			try {
-				solver.solve(this.doku);
+				unresolved = !solver.solve(this.doku);
 			} catch (CancellationException e) {
 				System.out.println("The user is bored !");
 			}
@@ -91,6 +99,11 @@ public class SudokuView extends BaseView {
 		});
 	}
 
+	private void renderResolvedText() {
+		if (this.resolved)
+			ImGui.text("Bravo !");
+	}
+
 	private void renderSolvePopup() {
 		if (ImGui.beginPopup("solve")) {
 			if (ImGui.button("Résoudre avec backtrace")) {
@@ -120,9 +133,8 @@ public class SudokuView extends BaseView {
 		if (resolveThread != null)
 			ImGui.endDisabled();
 
-		if (this.resolved) {
-			ImGui.text("Bravo !");
-		}
+		renderResolvedText();
+		renderUnsolvableText();
 
 		renderSolvePopup();
 	}
@@ -140,7 +152,7 @@ public class SudokuView extends BaseView {
 	}
 
 	private void renderClearButton() {
-		if(centeredButton("Effacer")){
+		if (centeredButton("Effacer")) {
 			this.doku.clearMutableCells();
 		}
 	}