Show unmute button tooltip about space bar.

Telegram/Resources/langs/lang.strings

@@ -2006,7 +2006,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_group_call_unmute_small" = "Unmute";
 "lng_group_call_more" = "More";
 "lng_group_call_unmute" = "Unmute";
-"lng_group_call_unmute_sub" = "or hold spacebar to talk";
+"lng_group_call_unmute_sub" = "Hold space bar to temporarily unmute.";
 "lng_group_call_you_are_live" = "You are Live";
 "lng_group_call_force_muted" = "Muted by admin";
 "lng_group_call_force_muted_sub" = "You are in Listen Only mode";

Telegram/SourceFiles/calls/calls.style

@@ -1254,3 +1254,9 @@ groupCallLargeVideo: GroupCallLargeVideo {
 
 groupCallVideoSmallSkip: 4px;
 groupCallVideoLargeSkip: 6px;
+
+groupCallTooltip: Tooltip(defaultTooltip) {
+	textBg: groupCallMembersBg;
+	textFg: groupCallMembersFg;
+	textBorder: groupCallMembersBgOver;
+}

Telegram/SourceFiles/calls/group/calls_group_panel.cpp

@@ -871,15 +871,7 @@ void Panel::setupRealMuteButtonState(not_null<Data::GroupCall*> real) {
 				: mute == MuteState::Muted
 				? tr::lng_group_call_unmute(tr::now)
 				: tr::lng_group_call_you_are_live(tr::now)),
-			.subtext = ((scheduleDate || wide)
-				? QString()
-				: state == GroupCall::InstanceState::Disconnected
-				? QString()
-				: mute == MuteState::ForceMuted
-				? tr::lng_group_call_raise_hand_tip(tr::now)
-				: mute == MuteState::RaisedHand
-				? tr::lng_group_call_raised_hand_sub(tr::now)
-				: mute == MuteState::Muted
+			.tooltip = ((!scheduleDate && mute == MuteState::Muted)
 				? tr::lng_group_call_unmute_sub(tr::now)
 				: QString()),
 			.type = (scheduleDate

Telegram/SourceFiles/ui/controls/call_mute_button.cpp

@@ -696,6 +696,17 @@ void CallMuteButton::init() {
 	const auto &button = _st->active.button;
 	_content->resize(button.width, button.height);
 
+	_content->events(
+	) | rpl::start_with_next([=](not_null<QEvent*> e) {
+		if (e->type() == QEvent::MouseMove) {
+			if (!_state.current().tooltip.isEmpty()) {
+				Ui::Tooltip::Show(1000, this);
+			}
+		} else if (e->type() == QEvent::Leave) {
+			Ui::Tooltip::Hide();
+		}
+	}, _content->lifetime());
+
 	rpl::combine(
 		_radialInfo.rawShowProgress.value(),
 		anim::Disables()
@@ -922,6 +933,24 @@ void CallMuteButton::iconAnimationCallback() {
 	}
 }
 
+QString CallMuteButton::tooltipText() const {
+	return _state.current().tooltip;
+}
+
+QPoint CallMuteButton::tooltipPos() const {
+	return QCursor::pos();
+}
+
+bool CallMuteButton::tooltipWindowActive() const {
+	return Ui::AppInFocus()
+		&& Ui::InFocusChain(_content->window())
+		&& _content->mapToGlobal(_content->rect()).contains(QCursor::pos());
+}
+
+const style::Tooltip *CallMuteButton::tooltipSt() const {
+	return &st::groupCallTooltip;
+}
+
 void CallMuteButton::updateLabelsGeometry() {
 	updateLabelGeometry(_content->geometry(), _label->size());
 	updateCenterLabelGeometry(_content->geometry(), _centerLabel->size());

Telegram/SourceFiles/ui/controls/call_mute_button.h

@@ -11,6 +11,7 @@
 #include "ui/effects/cross_line.h"
 #include "ui/effects/gradient.h"
 #include "ui/effects/radial_animation.h"
+#include "ui/widgets/tooltip.h"
 #include "lottie/lottie_icon.h"
 
 namespace style {
@@ -46,10 +47,11 @@ enum class CallMuteButtonType {
 struct CallMuteButtonState {
 	QString text;
 	QString subtext;
+	QString tooltip;
 	CallMuteButtonType type = CallMuteButtonType::Connecting;
 };
 
-class CallMuteButton final {
+class CallMuteButton final : private AbstractTooltipShower {
 public:
 	explicit CallMuteButton(
 		not_null<RpWidget*> parent,
@@ -143,6 +145,11 @@ private:
 	void startIconState(const IconState &state);
 	void iconAnimationCallback();
 
+	QString tooltipText() const override;
+	QPoint tooltipPos() const override;
+	bool tooltipWindowActive() const override;
+	const style::Tooltip *tooltipSt() const override;
+
 	[[nodiscard]] static HandleMouseState HandleMouseStateFromType(
 		CallMuteButtonType type);