From b6c86fd298db744c0465ce32885b934a46eae7b4 Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Fri, 2 Apr 2021 15:46:48 +0400
Subject: [PATCH] Add nice tips buttons.

---
 .../SourceFiles/payments/ui/payments.style    |  17 ++
 .../payments/ui/payments_form_summary.cpp     | 185 ++++++++++++++++--
 .../payments/ui/payments_form_summary.h       |  18 +-
 .../payments/ui/payments_panel.cpp            |  13 +-
 .../SourceFiles/payments/ui/payments_panel.h  |   1 +
 .../SourceFiles/ui/text/format_values.cpp     |   8 +-
 Telegram/SourceFiles/ui/text/format_values.h  |   3 +-
 7 files changed, 225 insertions(+), 20 deletions(-)

diff --git a/Telegram/SourceFiles/payments/ui/payments.style b/Telegram/SourceFiles/payments/ui/payments.style
index 7ec1a71497..fa068a568f 100644
--- a/Telegram/SourceFiles/payments/ui/payments.style
+++ b/Telegram/SourceFiles/payments/ui/payments.style
@@ -49,6 +49,23 @@ paymentsPricesTopSkip: 12px;
 paymentsPricesBottomSkip: 13px;
 paymentsPricePadding: margins(28px, 6px, 28px, 5px);
 
+paymentsTipSkip: 8px;
+paymentsTipButton: RoundButton(defaultLightButton) {
+	textFg: paymentsTipActive;
+	textFgOver: paymentsTipActive;
+	textBgOver: transparent;
+
+	width: -16px;
+	height: 28px;
+	textTop: 5px;
+}
+paymentsTipChosen: RoundButton(paymentsTipButton) {
+	textFg: windowFgActive;
+	textFgOver: windowFgActive;
+	textBgOver: transparent;
+}
+paymentsTipButtonsPadding: margins(26px, 6px, 26px, 6px);
+
 paymentsSectionsTopSkip: 11px;
 paymentsSectionButton: SettingsButton(infoProfileButton) {
 	padding: margins(68px, 11px, 14px, 9px);
diff --git a/Telegram/SourceFiles/payments/ui/payments_form_summary.cpp b/Telegram/SourceFiles/payments/ui/payments_form_summary.cpp
index 10cada6deb..9f60bae260 100644
--- a/Telegram/SourceFiles/payments/ui/payments_form_summary.cpp
+++ b/Telegram/SourceFiles/payments/ui/payments_form_summary.cpp
@@ -27,6 +27,36 @@ QString formatPhone(QString phone); // #TODO
 } // namespace App
 
 namespace Payments::Ui {
+namespace {
+
+constexpr auto kLightOpacity = 0.1;
+constexpr auto kLightRippleOpacity = 0.11;
+constexpr auto kChosenOpacity = 0.8;
+constexpr auto kChosenRippleOpacity = 0.5;
+
+[[nodiscard]] Fn<QColor()> TransparentColor(
+		const style::color &c,
+		float64 opacity) {
+	return [&c, opacity] {
+		return QColor(
+			c->c.red(),
+			c->c.green(),
+			c->c.blue(),
+			c->c.alpha() * opacity);
+	};
+}
+
+[[nodiscard]] style::RoundButton TipButtonStyle(
+		const style::RoundButton &original,
+		const style::color &light,
+		const style::color &ripple) {
+	auto result = original;
+	result.textBg = light;
+	result.ripple.color = ripple;
+	return result;
+}
+
+} // namespace
 
 using namespace ::Ui;
 
@@ -38,7 +68,8 @@ FormSummary::FormSummary(
 	const RequestedInformation &current,
 	const PaymentMethodDetails &method,
 	const ShippingOptions &options,
-	not_null<PanelDelegate*> delegate)
+	not_null<PanelDelegate*> delegate,
+	int scrollTop)
 : _delegate(delegate)
 , _invoice(invoice)
 , _method(method)
@@ -56,21 +87,45 @@ FormSummary::FormSummary(
 			rpl::single(formatAmount(computeTotalAmount()))),
 		st::paymentsPanelSubmit))
 , _cancel(
-		this,
-		(_invoice.receipt.paid
-			? tr::lng_about_done()
-			: tr::lng_cancel()),
-		st::paymentsPanelButton) {
+	this,
+	(_invoice.receipt.paid
+		? tr::lng_about_done()
+		: tr::lng_cancel()),
+	st::paymentsPanelButton)
+, _tipLightBg(TransparentColor(st::paymentsTipActive, kLightOpacity))
+, _tipLightRipple(
+	TransparentColor(st::paymentsTipActive, kLightRippleOpacity))
+, _tipChosenBg(TransparentColor(st::paymentsTipActive, kChosenOpacity))
+, _tipChosenRipple(
+	TransparentColor(st::paymentsTipActive, kChosenRippleOpacity))
+, _tipButton(TipButtonStyle(
+	st::paymentsTipButton,
+	_tipLightBg.color(),
+	_tipLightRipple.color()))
+, _tipChosen(TipButtonStyle(
+	st::paymentsTipChosen,
+	_tipChosenBg.color(),
+	_tipChosenRipple.color()))
+, _initialScrollTop(scrollTop) {
 	setupControls();
 }
 
+rpl::producer<int> FormSummary::scrollTopValue() const {
+	return _scroll->scrollTopValue();
+}
+
 void FormSummary::updateThumbnail(const QImage &thumbnail) {
 	_invoice.cover.thumbnail = thumbnail;
 	_thumbnails.fire_copy(thumbnail);
 }
 
-QString FormSummary::formatAmount(int64 amount) const {
-	return FillAmountAndCurrency(amount, _invoice.currency);
+QString FormSummary::formatAmount(
+		int64 amount,
+		bool forceStripDotZero) const {
+	return FillAmountAndCurrency(
+		amount,
+		_invoice.currency,
+		forceStripDotZero);
 }
 
 int64 FormSummary::computeTotalAmount() const {
@@ -279,9 +334,7 @@ void FormSummary::setupPrices(not_null<VerticalLayout*> layout) {
 			add(tr::lng_payments_tips_label(tr::now), tips);
 		}
 	} else if (_invoice.tipsMax > 0) {
-		const auto text = _invoice.tipsSelected
-			? formatAmount(_invoice.tipsSelected)
-			: tr::lng_payments_tips_add(tr::now);
+		const auto text = formatAmount(_invoice.tipsSelected);
 		const auto label = addRow(
 			tr::lng_payments_tips_label(tr::now),
 			Ui::Text::Link(text, "internal:edit_tips"));
@@ -289,12 +342,116 @@ void FormSummary::setupPrices(not_null<VerticalLayout*> layout) {
 			_delegate->panelChooseTips();
 			return false;
 		});
+		setupSuggestedTips(layout);
 	}
 
 	add(tr::lng_payments_total_label(tr::now), total, true);
 	Settings::AddSkip(layout, st::paymentsPricesBottomSkip);
 }
 
+void FormSummary::setupSuggestedTips(not_null<VerticalLayout*> layout) {
+	if (_invoice.suggestedTips.empty()) {
+		return;
+	}
+	struct Button {
+		RoundButton *widget = nullptr;
+		int minWidth = 0;
+	};
+	struct State {
+		std::vector<Button> buttons;
+		int maxWidth = 0;
+	};
+	const auto outer = layout->add(
+		object_ptr<RpWidget>(layout),
+		st::paymentsTipButtonsPadding);
+	const auto state = outer->lifetime().make_state<State>();
+	for (const auto amount : _invoice.suggestedTips) {
+		const auto text = formatAmount(amount, true);
+		const auto &st = (amount == _invoice.tipsSelected)
+			? _tipChosen
+			: _tipButton;
+		state->buttons.push_back(Button{
+			.widget = CreateChild<RoundButton>(
+				outer,
+				rpl::single(formatAmount(amount, true)),
+				st),
+		});
+		auto &button = state->buttons.back();
+		button.widget->show();
+		button.widget->setClickedCallback([=] {
+			_delegate->panelChangeTips(amount);
+		});
+		button.minWidth = button.widget->width();
+		state->maxWidth = std::max(state->maxWidth, button.minWidth);
+	}
+	outer->widthValue(
+	) | rpl::filter([=](int outerWidth) {
+		return outerWidth >= state->maxWidth;
+	}) | rpl::start_with_next([=](int outerWidth) {
+		const auto skip = st::paymentsTipSkip;
+		const auto &buttons = state->buttons;
+		auto left = outerWidth;
+		auto height = 0;
+		auto rowStart = 0;
+		auto rowEnd = 0;
+		auto buttonWidths = std::vector<float64>();
+		const auto layoutRow = [&] {
+			const auto count = rowEnd - rowStart;
+			if (!count) {
+				return;
+			}
+			buttonWidths.resize(count);
+			ranges::fill(buttonWidths, 0.);
+			auto available = float64(outerWidth - (count - 1) * skip);
+			auto zeros = count;
+			do {
+				const auto started = zeros;
+				const auto average = available / zeros;
+				for (auto i = 0; i != count; ++i) {
+					if (buttonWidths[i] > 0.) {
+						continue;
+					}
+					const auto min = buttons[rowStart + i].minWidth;
+					if (min > average) {
+						buttonWidths[i] = min;
+						available -= min;
+						--zeros;
+					}
+				}
+				if (started == zeros) {
+					for (auto i = 0; i != count; ++i) {
+						if (!buttonWidths[i]) {
+							buttonWidths[i] = average;
+						}
+					}
+					break;
+				}
+			} while (zeros > 0);
+			auto x = 0.;
+			for (auto i = 0; i != count; ++i) {
+				const auto button = buttons[rowStart + i].widget;
+				auto right = x + buttonWidths[i];
+				button->setFullWidth(int(std::round(right) - std::round(x)));
+				button->moveToLeft(int(std::round(x)), height, outerWidth);
+				x = right + skip;
+			}
+			height += buttons[0].widget->height() + skip;
+		};
+		for (const auto button : buttons) {
+			if (button.minWidth <= left) {
+				left -= button.minWidth + skip;
+				++rowEnd;
+				continue;
+			}
+			layoutRow();
+			rowStart = rowEnd++;
+			left = outerWidth - button.minWidth - skip;
+		}
+		layoutRow();
+		outer->resize(outerWidth, height - skip);
+	}, outer->lifetime());
+}
+
 void FormSummary::setupSections(not_null<VerticalLayout*> layout) {
 	Settings::AddSkip(layout, st::paymentsSectionsTopSkip);
 
@@ -419,6 +576,12 @@ void FormSummary::updateControlsGeometry() {
 	_cancel->moveToRight(right, buttonsTop + padding.top());
 
 	_scroll->updateBars();
+
+	if (buttonsTop > 0 && width() > 0) {
+		if (const auto top = base::take(_initialScrollTop)) {
+			_scroll->scrollToY(top);
+		}
+	}
 }
 
 } // namespace Payments::Ui
diff --git a/Telegram/SourceFiles/payments/ui/payments_form_summary.h b/Telegram/SourceFiles/payments/ui/payments_form_summary.h
index 7db3e4b16d..9d15f2e772 100644
--- a/Telegram/SourceFiles/payments/ui/payments_form_summary.h
+++ b/Telegram/SourceFiles/payments/ui/payments_form_summary.h
@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/rp_widget.h"
 #include "payments/ui/payments_panel_data.h"
 #include "base/object_ptr.h"
+#include "styles/style_widgets.h"
 
 namespace Ui {
 class ScrollArea;
@@ -32,9 +33,11 @@ public:
 		const RequestedInformation &current,
 		const PaymentMethodDetails &method,
 		const ShippingOptions &options,
-		not_null<PanelDelegate*> delegate);
+		not_null<PanelDelegate*> delegate,
+		int scrollTop);
 
 	void updateThumbnail(const QImage &thumbnail);
+	[[nodiscard]] rpl::producer<int> scrollTopValue() const;
 
 private:
 	void resizeEvent(QResizeEvent *e) override;
@@ -43,10 +46,13 @@ private:
 	[[nodiscard]] not_null<Ui::RpWidget*> setupContent();
 	void setupCover(not_null<VerticalLayout*> layout);
 	void setupPrices(not_null<VerticalLayout*> layout);
+	void setupSuggestedTips(not_null<VerticalLayout*> layout);
 	void setupSections(not_null<VerticalLayout*> layout);
 	void updateControlsGeometry();
 
-	[[nodiscard]] QString formatAmount(int64 amount) const;
+	[[nodiscard]] QString formatAmount(
+		int64 amount,
+		bool forceStripDotZero = false) const;
 	[[nodiscard]] int64 computeTotalAmount() const;
 
 	const not_null<PanelDelegate*> _delegate;
@@ -61,6 +67,14 @@ private:
 	object_ptr<RoundButton> _cancel;
 	rpl::event_stream<QImage> _thumbnails;
 
+	style::complex_color _tipLightBg;
+	style::complex_color _tipLightRipple;
+	style::complex_color _tipChosenBg;
+	style::complex_color _tipChosenRipple;
+	style::RoundButton _tipButton;
+	style::RoundButton _tipChosen;
+	int _initialScrollTop = 0;
+
 };
 
 } // namespace Payments::Ui
diff --git a/Telegram/SourceFiles/payments/ui/payments_panel.cpp b/Telegram/SourceFiles/payments/ui/payments_panel.cpp
index 110809014b..b3ae2dd661 100644
--- a/Telegram/SourceFiles/payments/ui/payments_panel.cpp
+++ b/Telegram/SourceFiles/payments/ui/payments_panel.cpp
@@ -66,10 +66,12 @@ void Panel::showForm(
 		current,
 		method,
 		options,
-		_delegate);
+		_delegate,
+		_formScrollTop.current());
 	_weakFormSummary = form.get();
 	_widget->showInner(std::move(form));
 	_widget->setBackAllowed(false);
+	_formScrollTop = _weakFormSummary->scrollTopValue();
 }
 
 void Panel::updateFormThumbnail(const QImage &thumbnail) {
@@ -204,7 +206,7 @@ void Panel::chooseTips(const Invoice &invoice) {
 					case 8: return "KZT";
 					}
 					return currency;
-				})(), // #TODO payments currency,
+				})(), // #TODO payments testing
 			});
 		box->setFocusCallback([=] {
 			row->setFocusFast();
@@ -221,7 +223,7 @@ void Panel::chooseTips(const Invoice &invoice) {
 					st::paymentTipsErrorLabel)),
 			st::paymentTipsErrorPadding);
 		errorWrap->hide(anim::type::instant);
-		box->addButton(tr::lng_settings_save(), [=] {
+		const auto submit = [=] {
 			const auto value = row->value().toLongLong();
 			if (value > max) {
 				row->showError();
@@ -230,7 +232,10 @@ void Panel::chooseTips(const Invoice &invoice) {
 				_delegate->panelChangeTips(value);
 				box->closeBox();
 			}
-		});
+		};
+		row->submitted(
+		) | rpl::start_with_next(submit, box->lifetime());
+		box->addButton(tr::lng_settings_save(), submit);
 		box->addButton(tr::lng_cancel(), [=] { box->closeBox(); });
 	}));
 }
diff --git a/Telegram/SourceFiles/payments/ui/payments_panel.h b/Telegram/SourceFiles/payments/ui/payments_panel.h
index afe5d72e5f..9701d7b5b5 100644
--- a/Telegram/SourceFiles/payments/ui/payments_panel.h
+++ b/Telegram/SourceFiles/payments/ui/payments_panel.h
@@ -91,6 +91,7 @@ private:
 	std::unique_ptr<RpWidget> _webviewBottom;
 	QPointer<Checkbox> _saveWebviewInformation;
 	QPointer<FormSummary> _weakFormSummary;
+	rpl::variable<int> _formScrollTop;
 	QPointer<EditInformation> _weakEditInformation;
 	QPointer<EditCard> _weakEditCard;
 	bool _testMode = false;
diff --git a/Telegram/SourceFiles/ui/text/format_values.cpp b/Telegram/SourceFiles/ui/text/format_values.cpp
index d469102ec4..3f48918f84 100644
--- a/Telegram/SourceFiles/ui/text/format_values.cpp
+++ b/Telegram/SourceFiles/ui/text/format_values.cpp
@@ -127,7 +127,10 @@ QString FormatPlayedText(qint64 played, qint64 duration) {
 	return tr::lng_duration_played(tr::now, lt_played, FormatDurationText(played), lt_duration, FormatDurationText(duration));
 }
 
-QString FillAmountAndCurrency(int64 amount, const QString &currency) {
+QString FillAmountAndCurrency(
+		int64 amount,
+		const QString &currency,
+		bool forceStripDotZero) {
 	const auto rule = LookupCurrencyRule(currency);
 
 	const auto prefix = (amount < 0)
@@ -142,7 +145,8 @@ QString FillAmountAndCurrency(int64 amount, const QString &currency) {
 		result.append(name);
 		if (rule.space) result.append(' ');
 	}
-	const auto precision = (!rule.stripDotZero || std::floor(value) != value)
+	const auto precision = ((!rule.stripDotZero && !forceStripDotZero)
+		|| std::floor(value) != value)
 		? rule.exponent
 		: 0;
 	result.append(FormatWithSeparators(
diff --git a/Telegram/SourceFiles/ui/text/format_values.h b/Telegram/SourceFiles/ui/text/format_values.h
index 0bfb69d9cd..2886dc0c98 100644
--- a/Telegram/SourceFiles/ui/text/format_values.h
+++ b/Telegram/SourceFiles/ui/text/format_values.h
@@ -35,7 +35,8 @@ struct CurrencyRule {
 
 [[nodiscard]] QString FillAmountAndCurrency(
 	int64 amount,
-	const QString &currency);
+	const QString &currency,
+	bool forceStripDotZero = false);
 [[nodiscard]] CurrencyRule LookupCurrencyRule(const QString &currency);
 [[nodiscard]] QString FormatWithSeparators(
 	double amount,