Added ability to hide footer of chart on demand from backend.

Telegram/SourceFiles/data/data_statistics_chart.h

@@ -61,6 +61,8 @@ struct StatisticalChart {
 
 	float64 timeStep = 0.;
 
+	bool isFooterHidden = false;
+
 };
 
 struct StatisticalGraph final {

Telegram/SourceFiles/statistics/chart_widget.cpp

@@ -836,6 +836,8 @@ ChartWidget::ChartWidget(not_null<Ui::RpWidget*> parent)
 		}
 	}, lifetime());
 	setupChartArea();
+	// We have to create the footer,
+	// even if it has to be hidden, otherwise it breaks some things.
 	setupFooter();
 }
 
@@ -865,15 +867,18 @@ int ChartWidget::resizeGetHeight(int newWidth) {
 		_header->moveToLeft(headerPadding.left(), headerPadding.top());
 		_header->resizeToWidth(newWidth - rect::m::sum::h(headerPadding));
 	}
-	const auto headerHeight = rect::m::sum::v(headerPadding)
+	const auto headerArea = rect::m::sum::v(headerPadding)
 		+ _header->height();
-	const auto resultHeight = headerHeight
+	const auto footerArea = (!_footer->isHidden())
+		? (st::statisticsChartFooterHeight + st::statisticsChartFooterSkip)
+		: 0;
+	const auto resultHeight = headerArea
 		+ st::statisticsChartHeight
-		+ st::statisticsChartFooterHeight
+		+ footerArea
-		+ st::statisticsChartFooterSkip
 		+ filtersTopSkip
 		+ filtersHeight;
 	{
+		if (footerArea) {
 			_footer->setGeometry(
 				0,
 				resultHeight
@@ -882,19 +887,19 @@ int ChartWidget::resizeGetHeight(int newWidth) {
 					- filtersHeight,
 				newWidth,
 				st::statisticsChartFooterHeight);
+		}
 		if (_filterButtons) {
 			_filterButtons->moveToLeft(0, resultHeight - filtersHeight);
 		}
 		_chartArea->setGeometry(
 			0,
-			headerHeight,
+			headerArea,
 			newWidth,
 			resultHeight
-				- headerHeight
+				- headerArea
-				- st::statisticsChartFooterHeight
+				- footerArea
 				- filtersTopSkip
-				- filtersHeight
+				- filtersHeight);
-				- st::statisticsChartFooterSkip);
 
 		{
 			updateChartFullWidth(newWidth);
@@ -906,7 +911,9 @@ int ChartWidget::resizeGetHeight(int newWidth) {
 
 void ChartWidget::updateChartFullWidth(int w) {
 	const auto finalXLimits = _animationController.finalXLimits();
-	_bottomLine.chartFullWidth = w / (finalXLimits.max - finalXLimits.min);
+	_bottomLine.chartFullWidth = (finalXLimits.max == finalXLimits.min)
+		? 0
+		: (w / (finalXLimits.max - finalXLimits.min));
 }
 
 QRect ChartWidget::chartAreaRect() const {
@@ -1266,6 +1273,9 @@ bool ChartWidget::hasLocalZoom() const {
 void ChartWidget::processLocalZoom(int xIndex) {
 	using Type = AbstractChartView::LocalZoomArgs::Type;
 	constexpr auto kFooterZoomDuration = crl::time(400);
+	if (_footer->isHidden()) {
+		return;
+	}
 	const auto wasZoom = _footer->xPercentageLimits();
 
 	const auto header = Ui::CreateChild<Header>(this);
@@ -1390,6 +1400,7 @@ void ChartWidget::setupFilterButtons() {
 		return;
 	}
 	_filterButtons = base::make_unique_q<ChartLinesFilterWidget>(this);
+	_filterButtons->show();
 
 	_filterButtons->buttonEnabledChanges(
 	) | rpl::start_with_next([=](const ChartLinesFilterWidget::Entry &e) {
@@ -1418,6 +1429,10 @@ void ChartWidget::setChartData(
 		}, _waitingSizeLifetime);
 		return;
 	}
+	if (_chartData) {
+		// We don't really support a replacement of chart data in runtime.
+		return;
+	}
 	_chartData = std::move(chartData);
 	FillLineColorsByKey(_chartData);
 
@@ -1425,6 +1440,10 @@ void ChartWidget::setChartData(
 	_chartView->setLinesFilterController(_linesFilterController);
 	_rulersView.setChartData(_chartData, type, _linesFilterController);
 
+	if (_chartData.isFooterHidden) {
+		_footer->hide();
+	}
+
 	setupDetails();
 	setupFilterButtons();
 
@@ -1439,15 +1458,13 @@ void ChartWidget::setChartData(
 		_chartView,
 		_linesFilterController,
 		0);
-	updateChartFullWidth(_chartArea->width());
 	updateHeader();
-	updateBottomDates();
 	_animationController.finish();
 	_rulersView.add(_animationController.finalHeightLimits(), false);
 
-	RpWidget::showChildren();
 	_chartArea->update();
 	_footer->update();
+
 	RpWidget::resizeToWidth(width());
 }
 

Telegram/SourceFiles/statistics/statistics_data_deserialize.cpp

@@ -74,6 +74,12 @@ Data::StatisticalChart StatisticalChartFromJSON(const QByteArray &json) {
 
 	{
 		const auto subchart = root.value(u"subchart"_q).toObject();
+		const auto subchartShowIt = subchart.constFind(u"show"_q);
+		if (subchartShowIt != subchart.constEnd()) {
+			if (subchartShowIt->isBool()) {
+				result.isFooterHidden = !(subchartShowIt->toBool());
+			}
+		}
 		const auto defaultZoomIt = subchart.constFind(u"defaultZoom"_q);
 		auto min = int(0);
 		auto max = int(result.x.size() - 1);