Add a new color and style::complex_color.

ui/colors.palette

@@ -140,6 +140,8 @@ boxTitleCloseFgOver: cancelIconFgOver; // settings close icon and box search can
 //boxSearchCancelIconFg: cancelIconFg; // search cancel X button icon (like in contacts box) (not implemented yet)
 //boxSearchCancelIconFgOver: cancelIconFgOver; // search cancel X button icon with mouse over (not implemented yet)
 
+paymentsTipActive: #01ad0f; // tip button text in payments checkout form
+
 membersAboutLimitFg: windowSubTextFgOver; // text in channel members box about the limit (max 200 last members are shown)
 
 contactsBg: windowBg; // contacts (and some other) box row background

ui/style/style_core_color.cpp

@@ -12,11 +12,14 @@ namespace style {
 namespace internal {
 
 Color::Proxy Color::operator[](const style::palette &paletteOverride) const {
-	auto index = main_palette::indexOfColor(*this);
-	return Proxy((index >= 0) ? paletteOverride.colorAtIndex(index) : (*this));
+	const auto index = main_palette::indexOfColor(*this);
+	return { (index >= 0) ? paletteOverride.colorAtIndex(index) : (*this) };
 }
 
-ColorData::ColorData(uchar r, uchar g, uchar b, uchar a) : c(int(r), int(g), int(b), int(a)), p(c), b(c) {
+ColorData::ColorData(uchar r, uchar g, uchar b, uchar a)
+: c(int(r), int(g), int(b), int(a))
+, p(c)
+, b(c) {
 }
 
 void ColorData::set(uchar r, uchar g, uchar b, uchar a) {
@@ -25,5 +28,12 @@ void ColorData::set(uchar r, uchar g, uchar b, uchar a) {
 	this->b = QBrush(c);
 }
 
+void ComplexColor::subscribeToPaletteChanges() {
+	style::PaletteChanged(
+	) | rpl::start_with_next([=] {
+		_owned.update(_generator());
+	}, _lifetime);
+}
+
 } // namespace internal
 } // namespace style

ui/style/style_core_color.h

@@ -10,6 +10,8 @@
 #include <QtGui/QPen>
 #include <QtGui/QBrush>
 
+#include <rpl/lifetime.h>
+
 namespace style {
 
 class palette;
@@ -17,13 +19,15 @@ class palette;
 namespace internal {
 
 class Color;
+class OwnedColor;
+
 class ColorData {
 public:
 	QColor c;
 	QPen p;
 	QBrush b;
 
-	QColor transparent() const {
+	[[nodiscard]] QColor transparent() const {
 		return QColor(c.red(), c.green(), c.blue(), 0);
 	}
 
@@ -35,6 +39,7 @@ private:
 	void set(uchar r, uchar g, uchar b, uchar a);
 
 	friend class Color;
+	friend class OwnedColor;
 	friend class style::palette;
 
 };
@@ -73,7 +78,9 @@ public:
 	Proxy operator[](const style::palette &paletteOverride) const;
 
 private:
+	friend class OwnedColor;
 	friend class style::palette;
+
 	Color(ColorData *data) : _data(data) {
 	}
 
@@ -81,6 +88,70 @@ private:
 
 };
 
+class OwnedColor final {
+public:
+	explicit OwnedColor(const QColor &color)
+	: _data(color.red(), color.green(), color.blue(), color.alpha())
+	, _color(&_data) {
+	}
+
+	OwnedColor(const OwnedColor &other)
+	: _data(other._data)
+	, _color(&_data) {
+	}
+
+	OwnedColor &operator=(const OwnedColor &other) {
+		_data = other._data;
+		return *this;
+	}
+
+	void update(const QColor &color) {
+		_data.set(color.red(), color.green(), color.blue(), color.alpha());
+	}
+
+	[[nodiscard]] const Color &color() const {
+		return _color;
+	}
+
+private:
+	ColorData _data;
+	Color _color;
+
+};
+
+class ComplexColor final {
+public:
+	explicit ComplexColor(Fn<QColor()> generator)
+	: _owned(generator())
+	, _generator(std::move(generator)) {
+		subscribeToPaletteChanges();
+	}
+
+	ComplexColor(const ComplexColor &other)
+	: _owned(other._owned)
+	, _generator(other._generator) {
+		subscribeToPaletteChanges();
+	}
+
+	ComplexColor &operator=(const ComplexColor &other) {
+		_owned = other._owned;
+		_generator = other._generator;
+		return *this;
+	}
+
+	[[nodiscard]] const Color &color() const {
+		return _owned.color();
+	}
+
+private:
+	void subscribeToPaletteChanges();
+
+	OwnedColor _owned;
+	Fn<QColor()> _generator;
+	rpl::lifetime _lifetime;
+
+};
+
 class Color::Proxy {
 public:
 	Proxy(Color color) : _color(color) {

ui/style/style_core_types.h

@@ -28,6 +28,8 @@ using align = Qt::Alignment;
 using margins = QMargins;
 using font = internal::Font;
 using color = internal::Color;
+using owned_color = internal::OwnedColor;
+using complex_color = internal::ComplexColor;
 using icon = internal::Icon;
 
 static constexpr cursor cur_default = Qt::ArrowCursor;