canellable stupid solver

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

@@ -3,6 +3,7 @@ package gui.menu;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.CancellationException;
 
 import gui.ColorGenerator;
 import gui.ColorGenerator.Color;
@@ -11,7 +12,7 @@ import imgui.ImVec2;
 import imgui.ImVec4;
 import imgui.flag.ImGuiCol;
 import imgui.flag.ImGuiStyleVar;
-import sudoku.solver.Solver;
+import sudoku.solver.StupidSolver;
 import sudoku.structure.Block;
 import sudoku.structure.Cell;
 import sudoku.structure.MultiDoku;
@@ -23,6 +24,7 @@ public class SudokuView extends BaseView {
 	private final MultiDoku doku;
 	private int currentIndex = -1;
 	private final Map<Block, Color> colorPalette;
+	private volatile Thread resolveThread = null;
 
 	public SudokuView(StateMachine stateMachine, int width, int height) {
 		super(stateMachine);
@@ -31,6 +33,13 @@ public class SudokuView extends BaseView {
 		initColors();
 	}
 
+	private void stopResolve() {
+		if (resolveThread != null && resolveThread.isAlive()) {
+			resolveThread.interrupt();
+			resolveThread = null;
+		}
+	}
+
 	private void initColors() {
 		List<Color> colors = ColorGenerator.greatPalette(doku.getSubGrid(0).getSize());
 		int index = 0;
@@ -80,10 +89,44 @@ public class SudokuView extends BaseView {
 			}
 		}
 		renderPopup();
+		if (resolveThread != null)
+			ImGui.beginDisabled();
+
 		if (ImGui.button("Résoudre")) {
-			Solver.solve(doku);
+			resolveThread = new Thread(new Runnable() {
+				@Override
+				public void run() {
+					try {
+						doku.getSubGrid(0).clear();
+						StupidSolver.solve(doku);
+						Thread.sleep(200);
+					} catch (CancellationException | InterruptedException e) {
+						System.out.println("The user is bored !");
+					}
+					stopResolve();
+				}
+			});
 		}
+		boolean wantsToStop = false;
+		if (resolveThread != null && resolveThread.isAlive()){
+			ImGui.endDisabled();
+			if (ImGui.button("Annuler")) {
+				// we can't stop the Thread right now
+				wantsToStop = true;
+			}
+		}
+		if (resolveThread != null && !resolveThread.isAlive()) {
+			resolveThread.start();
+		}
+		if (wantsToStop)
+			stopResolve();
 		renderReturnButton();
 	}
 
+	@Override
+	public void closeMenu() {
+		super.closeMenu();
+		stopResolve();
+	}
+
 }