Add view solution button to polls.

Telegram/SourceFiles/boxes/create_poll_box.cpp

@@ -38,7 +38,7 @@ constexpr auto kMaxOptionsCount = PollData::kMaxOptions;
 constexpr auto kOptionLimit = 100;
 constexpr auto kWarnQuestionLimit = 80;
 constexpr auto kWarnOptionLimit = 30;
-constexpr auto kSolutionLimit = 400;
+constexpr auto kSolutionLimit = 200;
 constexpr auto kErrorLimit = 99;
 
 class Options {

Telegram/SourceFiles/history/history.style

@@ -618,6 +618,11 @@ historyAudioInDownloadSelected: icon {{ "history_audio_download", historyFileInI
 historyAudioOutDownload: icon {{ "history_audio_download", historyFileOutIconFg }};
 historyAudioOutDownloadSelected: icon {{ "history_audio_download", historyFileOutIconFgSelected }};
 
+historyQuizExplainIn: icon {{ "quiz_explain", msgInDateFg }};
+historyQuizExplainInSelected: icon {{ "quiz_explain", msgInDateFgSelected }};
+historyQuizExplainOut: icon {{ "quiz_explain", msgOutDateFg }};
+historyQuizExplainOutSelected: icon {{ "quiz_explain", msgOutDateFgSelected }};
+
 historySlowmodeCounterMargins: margins(0px, 0px, 10px, 0px);
 
 largeEmojiSize: 36px;

Telegram/SourceFiles/history/view/media/history_view_poll.cpp

@@ -418,7 +418,7 @@ void Poll::checkQuizAnswered() {
 	}
 }
 
-void Poll::showSolution() {
+void Poll::showSolution() const {
 	if (_poll->solution.text.isEmpty()) {
 		return;
 	}
@@ -676,6 +676,7 @@ void Poll::draw(Painter &p, const QRect &r, TextSelection selection, crl::time m
 	p.setPen(regular);
 	_subtitle.drawLeftElided(p, padding.left(), tshift, paintw, width());
 	paintRecentVoters(p, padding.left() + _subtitle.maxWidth(), tshift, selection);
+	paintShowSolution(p, padding.left() + paintw, tshift, selection);
 	tshift += st::msgDateFont->height + st::historyPollAnswersSkip;
 
 	const auto progress = _answersAnimation
@@ -822,6 +823,29 @@ void Poll::paintRecentVoters(
 	}
 }
 
+void Poll::paintShowSolution(
+		Painter &p,
+		int right,
+		int top,
+		TextSelection selection) const {
+	if (!showVotes() || _poll->solution.text.isEmpty()) {
+		return;
+	}
+	if (!_showSolutionLink) {
+		_showSolutionLink = std::make_shared<LambdaClickHandler>(
+			crl::guard(this, [=] { showSolution(); }));
+	}
+	const auto outbg = _parent->hasOutLayout();
+	const auto &icon = (selection == FullSelection)
+		? (outbg
+			? st::historyQuizExplainOutSelected
+			: st::historyQuizExplainInSelected)
+		: (outbg ? st::historyQuizExplainOut : st::historyQuizExplainIn);
+	const auto x = right - icon.width();
+	const auto y = top + (st::normalFont->height - icon.height()) / 2;
+	icon.paint(p, x, y, width());
+}
+
 int Poll::paintAnswer(
 		Painter &p,
 		const Answer &answer,
@@ -1134,6 +1158,10 @@ TextState Poll::textState(QPoint point, StateRequest request) const {
 	paintw -= padding.left() + padding.right();
 
 	tshift += _question.countHeight(paintw) + st::historyPollSubtitleSkip;
+	if (inShowSolution(point, padding.left() + paintw, tshift)) {
+		result.link = _showSolutionLink;
+		return result;
+	}
 	tshift += st::msgDateFont->height + st::historyPollAnswersSkip;
 	const auto awidth = paintw
 		- st::historyPollAnswerPadding.left()
@@ -1267,6 +1295,23 @@ void Poll::toggleRipple(Answer &answer, bool pressed) {
 	}
 }
 
+bool Poll::canShowSolution() const {
+	return showVotes() && !_poll->solution.text.isEmpty();
+}
+
+bool Poll::inShowSolution(
+		QPoint point,
+		int right,
+		int top) const {
+	if (!canShowSolution()) {
+		return false;
+	}
+	const auto &icon = st::historyQuizExplainIn;
+	const auto x = right - icon.width();
+	const auto y = top + (st::normalFont->height - icon.height()) / 2;
+	return QRect(x, y, icon.width(), icon.height()).contains(point);
+}
+
 int Poll::bottomButtonHeight() const {
 	const auto skip = st::historyPollChoiceRight.height()
 		- st::historyPollFillingBottom

Telegram/SourceFiles/history/view/media/history_view_poll.h

@@ -96,6 +96,11 @@ private:
 		int left,
 		int top,
 		TextSelection selection) const;
+	void paintShowSolution(
+		Painter &p,
+		int right,
+		int top,
+		TextSelection selection) const;
 	int paintAnswer(
 		Painter &p,
 		const Answer &answer,
@@ -155,7 +160,13 @@ private:
 	void sendMultiOptions();
 	void showResults();
 	void checkQuizAnswered();
-	void showSolution();
+	void showSolution() const;
+
+	[[nodiscard]] bool canShowSolution() const;
+	[[nodiscard]] bool inShowSolution(
+		QPoint point,
+		int right,
+		int top) const;
 
 	[[nodiscard]] int bottomButtonHeight() const;
 
@@ -174,6 +185,7 @@ private:
 	Ui::Text::String _totalVotesLabel;
 	ClickHandlerPtr _showResultsLink;
 	ClickHandlerPtr _sendVotesLink;
+	mutable ClickHandlerPtr _showSolutionLink;
 	mutable std::unique_ptr<Ui::RippleAnimation> _linkRipple;
 
 	mutable std::unique_ptr<AnswersAnimation> _answersAnimation;