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Chess: Display appropriate dialog when engine move ends the game

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A dialog is now displayed when an engine move results in a checkmate
or a draw. In the case of threefold repetition or the fifty move rule,
the engine will always accept a draw. A human player is asked if they
would like to accept a draw.
This commit is contained in:
Tim Ledbetter 2023-04-28 18:38:07 +01:00 • committed by Andreas Kling
parent d9f0c2a806
commit e1de31a3fe
2 changed files with 55 additions and 56 deletions
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104
Userland/Games/Chess/ChessWidget.cpp
View file

@ -262,62 +262,10 @@ void ChessWidget::mouseup_event(GUI::MouseEvent& event)
m_playback_move_number = board().moves().size();
m_playback = false;
m_board_playback = m_board;
if (board().game_result() != Chess::Board::Result::NotFinished) {
bool over = true;
StringView msg;
switch (board().game_result()) {
case Chess::Board::Result::CheckMate:
if (board().turn() == Chess::Color::White) {
msg = "Black wins by Checkmate."sv;
} else {
msg = "White wins by Checkmate."sv;
}
break;
case Chess::Board::Result::StaleMate:
msg = "Draw by Stalemate."sv;
break;
case Chess::Board::Result::FiftyMoveRule:
update();
if (GUI::MessageBox::show(window(), "50 moves have elapsed without a capture. Claim Draw?"sv, "Claim Draw?"sv,
GUI::MessageBox::Type::Information, GUI::MessageBox::InputType::YesNo)
== GUI::Dialog::ExecResult::Yes) {
msg = "Draw by 50 move rule."sv;
} else {
over = false;
}
break;
case Chess::Board::Result::SeventyFiveMoveRule:
msg = "Draw by 75 move rule."sv;
break;
case Chess::Board::Result::ThreeFoldRepetition:
update();
if (GUI::MessageBox::show(window(), "The same board state has repeated three times. Claim Draw?"sv, "Claim Draw?"sv,
GUI::MessageBox::Type::Information, GUI::MessageBox::InputType::YesNo)
== GUI::Dialog::ExecResult::Yes) {
msg = "Draw by threefold repetition."sv;
} else {
over = false;
}
break;
case Chess::Board::Result::FiveFoldRepetition:
msg = "Draw by fivefold repetition."sv;
break;
case Chess::Board::Result::InsufficientMaterial:
msg = "Draw by insufficient material."sv;
break;
default:
VERIFY_NOT_REACHED();
}
if (over) {
set_override_cursor(Gfx::StandardCursor::None);
set_drag_enabled(false);
update();
GUI::MessageBox::show(window(), msg, "Game Over"sv, GUI::MessageBox::Type::Information);
}
} else {
// If two humans are playing, ask whether they wish to accept a draw.
auto claim_draw_behavior = m_engine.is_null() ? ClaimDrawBehavior::Prompt : ClaimDrawBehavior::Always;
if (!check_game_over(claim_draw_behavior))
input_engine_move();
}
}
update();
@ -485,8 +433,11 @@ void ChessWidget::input_engine_move()
if (!want_engine_move())
return;
set_drag_enabled(drag_was_enabled);
if (!move.is_error())
if (!move.is_error()) {
VERIFY(board().apply_move(move.release_value()));
if (check_game_over(ClaimDrawBehavior::Prompt))
return;
}
m_playback_move_number = m_board.moves().size();
m_playback = false;
@ -713,6 +664,47 @@ int ChessWidget::resign()
return 0;
}
bool ChessWidget::check_game_over(ClaimDrawBehavior claim_draw_behavior)
{
if (board().game_result() == Chess::Board::Result::NotFinished)
return false;
auto over = true;
switch (board().game_result()) {
case Chess::Board::Result::FiftyMoveRule:
if (claim_draw_behavior == ClaimDrawBehavior::Prompt) {
update();
auto dialog_result = GUI::MessageBox::show(window(), "50 moves have elapsed without a capture. Claim Draw?"sv, "Claim Draw?"sv,
GUI::MessageBox::Type::Information, GUI::MessageBox::InputType::YesNo);
if (dialog_result != GUI::Dialog::ExecResult::Yes)
over = false;
}
break;
case Chess::Board::Result::ThreeFoldRepetition:
if (claim_draw_behavior == ClaimDrawBehavior::Prompt) {
update();
auto dialog_result = GUI::MessageBox::show(window(), "The same board state has repeated three times. Claim Draw?"sv, "Claim Draw?"sv,
GUI::MessageBox::Type::Information, GUI::MessageBox::InputType::YesNo);
if (dialog_result != GUI::Dialog::ExecResult::Yes)
over = false;
}
break;
default:
break;
}
if (!over)
return false;
set_override_cursor(Gfx::StandardCursor::None);
set_drag_enabled(false);
update();
auto msg = Chess::Board::result_to_string(board().game_result(), board().turn());
GUI::MessageBox::show(window(), msg, "Game Over"sv, GUI::MessageBox::Type::Information);
return true;
}
void ChessWidget::config_string_did_change(DeprecatedString const& domain, DeprecatedString const& group, DeprecatedString const& key, DeprecatedString const& value)
{
if (domain != "Games"sv && group != "Chess"sv)

7
Userland/Games/Chess/ChessWidget.h
View file

@ -111,11 +111,18 @@ public:
};
private:
enum class ClaimDrawBehavior {
Always,
Prompt
};
ChessWidget() = default;
virtual void config_string_did_change(DeprecatedString const& domain, DeprecatedString const& group, DeprecatedString const& key, DeprecatedString const& value) override;
virtual void config_bool_did_change(DeprecatedString const& domain, DeprecatedString const& group, DeprecatedString const& key, bool value) override;
bool check_game_over(ClaimDrawBehavior);
Chess::Board m_board;
Chess::Board m_board_playback;
bool m_playback { false };