Improve toasts: adaptive, with a title.

ui/toast/toast.h

@@ -33,10 +33,12 @@ using ClickHandlerFilter = Fn<bool(const ClickHandlerPtr&, Qt::MouseButton)>;
 
 inline constexpr auto kDefaultDuration = crl::time(1500);
 struct Config {
+	QString title;
 	TextWithEntities text;
 	not_null<const style::Toast*> st = &st::defaultMultilineToast;
 	crl::time duration = kDefaultDuration;
 	int maxLines = 16;
+	bool adaptive = false;
 	bool multiline = true;
 	bool dark = false;
 	RectPart slideSide = RectPart::None;

ui/toast/toast_widget.cpp

@@ -7,6 +7,8 @@
 #include "ui/toast/toast_widget.h"
 
 #include "ui/image/image_prepare.h"
+#include "ui/text/text_utilities.h"
+#include "ui/widgets/tooltip.h"
 #include "ui/painter.h"
 #include "styles/palette.h"
 #include "styles/style_widgets.h"
@@ -16,6 +18,21 @@
 namespace Ui {
 namespace Toast {
 namespace internal {
+namespace {
+
+[[nodiscard]] TextWithEntities ComputeText(const Config &config) {
+	auto result = config.text;
+	if (!config.title.isEmpty()) {
+		result = Text::Bold(
+			config.title
+		).append('\n').append(std::move(result));
+	}
+	return config.multiline
+		? result
+		: TextUtilities::SingleLine(std::move(result));
+}
+
+} // namespace
 
 Widget::Widget(QWidget *parent, const Config &config)
 : RpWidget(parent)
@@ -24,6 +41,7 @@ Widget::Widget(QWidget *parent, const Config &config)
 , _slideSide(config.slideSide)
 , _multiline(config.multiline)
 , _dark(config.dark)
+, _adaptive(config.adaptive)
 , _maxTextWidth(widthWithoutPadding(_st->maxWidth))
 , _maxTextHeight(
 	config.st->style.font->height * (_multiline ? config.maxLines : 1))
@@ -37,7 +55,7 @@ Widget::Widget(QWidget *parent, const Config &config)
 	};
 	_text.setMarkedText(
 		_st->style,
-		_multiline ? config.text : TextUtilities::SingleLine(config.text),
+		ComputeText(config),
 		toastOptions,
 		config.textContext ? config.textContext(this) : std::any());
 	if (_text.hasSpoilers()) {
@@ -74,6 +92,12 @@ void Widget::updateGeometry() {
 	accumulate_min(
 		width,
 		parentWidget()->width() - _st->margin.left() - _st->margin.right());
+	if (_adaptive) {
+		const auto added = _st->padding.left() + _st->padding.right();
+		width = FindNiceTooltipWidth(0, width - added, [&](int width) {
+			return _text.countHeight(width);
+		}) + added;
+	}
 	_textWidth = widthWithoutPadding(width);
 	_textHeight = _multiline
 		? qMin(_text.countHeight(_textWidth), _maxTextHeight)

ui/toast/toast_widget.h

@@ -45,6 +45,7 @@ private:
 	bool _multiline = false;
 	bool _dark = false;
 	bool _processMouse = false;
+	bool _adaptive = false;
 
 	int _maxTextWidth = 0;
 	int _maxTextHeight = 0;

ui/widgets/tooltip.cpp

@@ -411,6 +411,25 @@ void ImportantTooltip::paintEvent(QPaintEvent *e) {
 	}
 }
 
+[[nodiscard]] int FindNiceTooltipWidth(
+		int minWidth,
+		int maxWidth,
+		Fn<int(int width)> heightForWidth) {
+	Expects(minWidth >= 0);
+	Expects(maxWidth > minWidth);
+
+	const auto desired = heightForWidth(maxWidth);
+	while (maxWidth - minWidth > 1) {
+		const auto middle = (minWidth + maxWidth) / 2;
+		if (heightForWidth(middle) > desired) {
+			minWidth = middle;
+		} else {
+			maxWidth = middle;
+		}
+	}
+	return maxWidth;
+}
+
 object_ptr<FlatLabel> MakeNiceTooltipLabel(
 		QWidget *parent,
 		rpl::producer<TextWithEntities> &&text,
@@ -431,19 +450,14 @@ object_ptr<FlatLabel> MakeNiceTooltipLabel(
 		if (raw->naturalWidth() <= maxWidth) {
 			return;
 		}
-		const auto desired = raw->heightNoMargins();
+		const auto niceWidth = FindNiceTooltipWidth(
-		auto from = st.minWidth;
+			st.minWidth,
-		auto till = maxWidth;
+			maxWidth,
-		while (till - from > 1) {
+			[&](int width) {
-			const auto middle = (from + till) / 2;
+				raw->resizeToWidth(width);
-			raw->resizeToWidth(middle);
+				return raw->heightNoMargins();
-			if (raw->heightNoMargins() > desired) {
+			});
-				from = middle;
+		raw->resizeToWidth(niceWidth);
-			} else {
-				till = middle;
-			}
-		}
-		raw->resizeToWidth(till);
 	}, raw->lifetime());
 	return result;
 }

ui/widgets/tooltip.h

@@ -122,6 +122,11 @@ private:
 
 };
 
+[[nodiscard]] int FindNiceTooltipWidth(
+	int minWidth,
+	int maxWidth,
+	Fn<int(int width)> heightForWidth);
+
 [[nodiscard]] object_ptr<FlatLabel> MakeNiceTooltipLabel(
 	QWidget *parent,
 	rpl::producer<TextWithEntities> &&text,