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Telegram/SourceFiles/payments/ui/payments_field.h

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "base/object_ptr.h"
+#include "base/unique_qptr.h"
+
+namespace Ui {
+class RpWidget;
+class InputField;
+class MaskedInputField;
+class BoxContent;
+} // namespace Ui
+
+namespace Payments::Ui {
+
+using namespace ::Ui;
+
+enum class FieldType {
+	Text,
+	CardNumber,
+	CardExpireDate,
+	CardCVC,
+	Country,
+	Phone,
+	Email,
+	Money,
+};
+
+struct FieldValidateRequest {
+	QString wasValue;
+	int wasPosition = 0;
+	int wasAnchor = 0;
+	QString nowValue;
+	int nowPosition = 0;
+};
+
+struct FieldValidateResult {
+	QString value;
+	int position = 0;
+	bool invalid = false;
+	bool finished = false;
+};
+
+[[nodiscard]] inline auto RangeLengthValidator(int minLength, int maxLength) {
+	return [=](FieldValidateRequest request) {
+		return FieldValidateResult{
+			.value = request.nowValue,
+			.position = request.nowPosition,
+			.invalid = (request.nowValue.size() < minLength
+				|| request.nowValue.size() > maxLength),
+		};
+	};
+}
+
+[[nodiscard]] inline auto MaxLengthValidator(int maxLength) {
+	return RangeLengthValidator(0, maxLength);
+}
+
+[[nodiscard]] inline auto RequiredValidator() {
+	return RangeLengthValidator(1, std::numeric_limits<int>::max());
+}
+
+[[nodiscard]] inline auto RequiredFinishedValidator() {
+	return [=](FieldValidateRequest request) {
+		return FieldValidateResult{
+			.value = request.nowValue,
+			.position = request.nowPosition,
+			.invalid = request.nowValue.isEmpty(),
+			.finished = !request.nowValue.isEmpty(),
+		};
+	};
+}
+
+struct FieldConfig {
+	FieldType type = FieldType::Text;
+	rpl::producer<QString> placeholder;
+	QString value;
+	Fn<FieldValidateResult(FieldValidateRequest)> validator;
+	Fn<void(object_ptr<BoxContent>)> showBox;
+	QString currency;
+	QString defaultPhone;
+	QString defaultCountry;
+};
+
+class Field final {
+public:
+	Field(QWidget *parent, FieldConfig &&config);
+
+	[[nodiscard]] RpWidget *widget() const;
+	[[nodiscard]] object_ptr<RpWidget> ownedWidget() const;
+
+	[[nodiscard]] QString value() const;
+	[[nodiscard]] rpl::producer<> frontBackspace() const;
+	[[nodiscard]] rpl::producer<> finished() const;
+	[[nodiscard]] rpl::producer<> submitted() const;
+
+	void activate();
+	void setFocus();
+	void setFocusFast();
+	void showError();
+	void showErrorNoFocus();
+
+	void setNextField(not_null<Field*> field);
+	void setPreviousField(not_null<Field*> field);
+
+private:
+	struct State {
+		QString value;
+		int position = 0;
+		int anchor = 0;
+	};
+	using ValidateRequest = FieldValidateRequest;
+	using ValidateResult = FieldValidateResult;
+
+	void setupMaskedGeometry();
+	void setupCountry();
+	void setupValidator(Fn<ValidateResult(ValidateRequest)> validator);
+	void setupFrontBackspace();
+	void setupSubmit();
+
+	const FieldConfig _config;
+	const base::unique_qptr<RpWidget> _wrap;
+	rpl::event_stream<> _frontBackspace;
+	rpl::event_stream<> _finished;
+	rpl::event_stream<> _submitted;
+	rpl::event_stream<> _textPossiblyChanged; // Must be above _masked.
+	InputField *_input = nullptr;
+	MaskedInputField *_masked = nullptr;
+	Field *_nextField = nullptr;
+	QString _countryIso2;
+	State _was;
+	bool _validating = false;
+	bool _valid = true;
+
+};
+
+} // namespace Payments::Ui