Added support to hide chart elements with opacity from chart view.

Telegram/SourceFiles/statistics/chart_widget.cpp

@@ -47,6 +47,7 @@ void PaintBottomLine(
 		int y,
 		int captionIndicesOffset) {
 	p.setFont(st::statisticsDetailsBottomCaptionStyle.font);
+	const auto opacity = p.opacity();
 
 	const auto startXIndex = chartData.findStartIndex(
 		xPercentageLimits.min);
@@ -105,7 +106,8 @@ void PaintBottomLine(
 					0.,
 					1. + ((chartWidth - rect::right(r)) / edgeAlphaSize))
 				: 1.;
-			p.setOpacity(edgeAlpha
+			p.setOpacity(opacity
+				* edgeAlpha
 				* (hasFastAlpha ? fastAlpha : resultAlpha));
 			p.drawText(r, chartData.getDayString(i), style::al_center);
 		}
@@ -450,7 +452,11 @@ void ChartWidget::Footer::paintEvent(QPaintEvent *e) {
 	if (_paintChartCallback) {
 		auto q = QPainter(&_frame);
 
+		{
+			const auto opacity = q.opacity();
 			_paintChartCallback(q, Rect(innerRect.size()));
+			q.setOpacity(opacity);
+		}
 
 		q.setCompositionMode(QPainter::CompositionMode_DestinationIn);
 		q.drawImage(0, 0, _mask);

Telegram/SourceFiles/statistics/view/chart_horizontal_lines_view.cpp

@@ -39,9 +39,9 @@ void ChartHorizontalLinesView::setChartData(
 void ChartHorizontalLinesView::paintHorizontalLines(
 		QPainter &p,
 		const QRect &r) {
-	for (auto &horizontalLine : _horizontalLines) {
 	const auto alpha = p.opacity();
-		p.setOpacity(horizontalLine.alpha);
+	for (auto &horizontalLine : _horizontalLines) {
+		p.setOpacity(alpha * horizontalLine.alpha);
 		for (const auto &line : horizontalLine.lines) {
 			const auto lineRect = QRect(
 				0,
@@ -50,8 +50,8 @@ void ChartHorizontalLinesView::paintHorizontalLines(
 				st::lineWidth);
 			p.fillRect(lineRect, st::windowSubTextFg);
 		}
-		p.setOpacity(alpha);
 	}
+	p.setOpacity(alpha);
 }
 
 void ChartHorizontalLinesView::paintCaptionsToHorizontalLines(
@@ -59,9 +59,9 @@ void ChartHorizontalLinesView::paintCaptionsToHorizontalLines(
 		const QRect &r) {
 	const auto offset = r.y() - st::statisticsChartHorizontalLineCaptionSkip;
 	p.setFont(st::statisticsDetailsBottomCaptionStyle.font);
-	for (auto &horizontalLine : _horizontalLines) {
 	const auto alpha = p.opacity();
-		p.setOpacity(horizontalLine.alpha);
+	for (auto &horizontalLine : _horizontalLines) {
+		p.setOpacity(alpha * horizontalLine.alpha);
 		for (const auto &line : horizontalLine.lines) {
 			const auto y = offset + r.height() * line.relativeValue;
 			p.setPen(_isDouble ? _leftPen : st::windowSubTextFg);
@@ -83,8 +83,8 @@ void ChartHorizontalLinesView::paintCaptionsToHorizontalLines(
 						: line.scaledLineCaption);
 			}
 		}
-		p.setOpacity(alpha);
 	}
+	p.setOpacity(alpha);
 }
 
 void ChartHorizontalLinesView::computeRelative(

Telegram/SourceFiles/statistics/view/linear_chart_view.cpp

@@ -71,6 +71,7 @@ void LinearChartView::paint(QPainter &p, const PaintContext &c) {
 		c.heightLimits,
 		c.rect.size());
 
+	const auto opacity = p.opacity();
 	const auto imageSize = c.rect.size() * style::DevicePixelRatio();
 	const auto cacheScale = 1. / style::DevicePixelRatio();
 	auto &caches = (c.footer ? _footerCaches : _mainCaches);
@@ -117,6 +118,7 @@ void LinearChartView::paint(QPainter &p, const PaintContext &c) {
 		cache.lastToken = cacheToken;
 		cache.image = std::move(image);
 	}
+	p.setOpacity(opacity);
 }
 
 void LinearChartView::paintSelectedXIndex(

Telegram/SourceFiles/statistics/view/stack_linear_chart_view.cpp

@@ -130,10 +130,11 @@ void StackLinearChartView::paintChartOrZoomAnimation(
 		const PaintContext &c) {
 	if (_transitionProgress == 1.) {
 		if (c.footer) {
-			return paintZoomedFooter(p, c);
+			paintZoomedFooter(p, c);
 		} else {
-			return paintZoomed(p, c);
+			paintZoomed(p, c);
 		}
+		return p.setOpacity(0.);
 	}
 	const auto &[localStart, localEnd] = _lastPaintedXIndices;
 	_skipPoints = std::vector<bool>(c.chartData.lines.size(), false);
@@ -365,7 +366,7 @@ void StackLinearChartView::paintChartOrZoomAnimation(
 
 	auto hq = PainterHighQualityEnabler(p);
 
-	p.fillRect(c.rect, st::boxBg);
+	p.fillRect(c.rect + QMargins(0, 0, 0, st::lineWidth), st::boxBg);
 	if (!ovalPath.isEmpty()) {
 		p.setClipPath(ovalPath);
 	}
@@ -401,13 +402,18 @@ void StackLinearChartView::paintChartOrZoomAnimation(
 		p.setPen(st::boxBg);
 		p.drawPath(ovalPath);
 	}
+
+	if (!ovalPath.isEmpty()) {
+		p.setClipRect(c.rect, Qt::NoClip);
+	}
+	p.setOpacity(1. - _transitionProgress);
 }
 
 void StackLinearChartView::paintZoomed(QPainter &p, const PaintContext &c) {
 	if (c.footer) {
 		return;
 	}
-	p.fillRect(c.rect, st::boxBg);
+	p.fillRect(c.rect + QMargins(0, 0, 0, st::lineWidth), st::boxBg);
 	const auto center = QPointF(c.rect.center());
 	const auto side = (c.rect.width() / 2.) * kCircleSizeRatio;
 	const auto rectF = QRectF(