Add expression history to evaluator

Author: KoBeWi

editor/debugger/editor_expression_evaluator.cpp

@@ -55,6 +55,41 @@ void EditorExpressionEvaluator::add_value(const Array &p_array) {
 	inspector->set_h_scroll(0);
 }
 
+void EditorExpressionEvaluator::_line_edit_gui_input(const Ref<InputEvent> &p_event) {
+	if (!expression_input->is_editing()) {
+		return;
+	}
+
+	const Ref<InputEventKey> k = p_event;
+	if (k.is_null() || !k->is_pressed()) {
+		return;
+	}
+
+	if (k->is_action_pressed("ui_up", true)) {
+		int size = expression_history.size();
+		if (expression_index < size - 1) {
+			expression_index++;
+
+			const String &history_text = expression_history[expression_history.size() - expression_index - 1];
+			expression_input->set_text(history_text);
+			expression_input->set_caret_column(history_text.size());
+		}
+		accept_event();
+	} else if (k->is_action_pressed("ui_down", true)) {
+		if (expression_index > 0) {
+			expression_index--;
+
+			const String &history_text = expression_history[expression_history.size() - expression_index - 1];
+			expression_input->set_text(history_text);
+			expression_input->set_caret_column(history_text.size());
+		} else if (expression_index == 0) {
+			expression_index = -1;
+			expression_input->clear();
+		}
+		accept_event();
+	}
+}
+
 void EditorExpressionEvaluator::_evaluate() {
 	const String &expression = expression_input->get_text();
 	if (expression.is_empty()) {
@@ -65,6 +100,10 @@ void EditorExpressionEvaluator::_evaluate() {
 		return;
 	}
 
+	expression_history.erase(expression);
+	expression_history.push_back(expression);
+	expression_index = -1;
+
 	editor_debugger->request_remote_evaluate(expression, editor_debugger->get_stack_script_frame());
 
 	expression_input->clear();
@@ -81,6 +120,7 @@ void EditorExpressionEvaluator::_remote_object_selected(ObjectID p_id) {
 
 void EditorExpressionEvaluator::_on_expression_input_changed(const String &p_expression) {
 	evaluate_btn->set_disabled(p_expression.is_empty());
+	expression_index = -1;
 }
 
 void EditorExpressionEvaluator::_on_debugger_breaked(bool p_breaked, bool p_can_debug) {
@@ -110,9 +150,11 @@ EditorExpressionEvaluator::EditorExpressionEvaluator() {
 
 	expression_input = memnew(LineEdit);
 	expression_input->set_h_size_flags(Control::SIZE_EXPAND_FILL);
-	expression_input->set_placeholder(TTR("Expression to evaluate"));
+	expression_input->set_placeholder(TTRC("Expression to evaluate (Up/Down: Navigate history)"));
 	expression_input->set_accessibility_name(TTRC("Expression to evaluate"));
 	expression_input->set_clear_button_enabled(true);
+	expression_input->set_keep_editing_on_text_submit(true);
+	expression_input->connect(SceneStringName(gui_input), callable_mp(this, &EditorExpressionEvaluator::_line_edit_gui_input));
 	expression_input->connect(SceneStringName(text_submitted), callable_mp(this, &EditorExpressionEvaluator::_evaluate).unbind(1));
 	expression_input->connect(SceneStringName(text_changed), callable_mp(this, &EditorExpressionEvaluator::_on_expression_input_changed));
 	hb->add_child(expression_input);

editor/debugger/editor_expression_evaluator.h

@@ -52,6 +52,10 @@ class EditorExpressionEvaluator : public VBoxContainer {
 
 	EditorDebuggerInspector *inspector = nullptr;
 
+	LocalVector<String> expression_history;
+	int expression_index = -1;
+
+	void _line_edit_gui_input(const Ref<InputEvent> &p_event);
 	void _evaluate();
 	void _clear();