cabana: fix tooltip will not show if chart is partial visible. (#27897)

* use horizontalSpacing

* fix chart toopl tip

tools/cabana/chart/chart.cc

@@ -512,6 +512,13 @@ void ChartView::mouseMoveEvent(QMouseEvent *ev) {
 }
 
 void ChartView::showTip(double sec) {
+  QRect tip_area(0, chart()->plotArea().top(), rect().width(), chart()->plotArea().height());
+  QRect visible_rect = charts_widget->chartVisibleRect(this).intersected(tip_area);
+  if (visible_rect.isEmpty()) {
+    tip_label.hide();
+    return;
+  }
+
   tooltip_x = chart()->mapToPosition({sec, 0}).x();
   qreal x = tooltip_x;
   QStringList text_list(QString::number(chart()->mapToValue({x, 0}).x(), 'f', 3));
@@ -532,9 +539,9 @@ void ChartView::showTip(double sec) {
                        .arg(s.series->color().name(), name, value, min, max);
     }
   }
-  QPointF tooltip_pt(x, chart()->plotArea().top());
-  int plot_right = mapToGlobal(chart()->plotArea().topRight().toPoint()).x();
-  tip_label.showText(mapToGlobal(tooltip_pt.toPoint()), "<p style='white-space:pre'>" + text_list.join("<br />") + "</p>", plot_right);
+  QPoint pt(x, chart()->plotArea().top());
+  QString text = "<p style='white-space:pre'>" % text_list.join("<br />") % "</p>";
+  tip_label.showText(pt, text, this, visible_rect);
   viewport()->update();
 }
 

tools/cabana/chart/chartswidget.cc

@@ -161,14 +161,14 @@ void ChartsWidget::zoomReset() {
   zoom_undo_stack->clear();
 }
 
-void ChartsWidget::showValueTip(double sec) {
+QRect ChartsWidget::chartVisibleRect(ChartView *chart) {
   const QRect visible_rect(-charts_container->pos(), charts_scroll->viewport()->size());
+  return chart->rect().intersected(QRect(chart->mapFrom(charts_container, visible_rect.topLeft()), visible_rect.size()));
+}
+
+void ChartsWidget::showValueTip(double sec) {
   for (auto c : currentCharts()) {
-    if (sec >= 0 && visible_rect.contains(QRect(c->mapTo(charts_container, QPoint(0, 0)), c->size()))) {
-      c->showTip(sec);
-    } else {
-      c->hideTip();
-    }
+    sec >= 0 ? c->showTip(sec) : c->hideTip();
   }
 }
 
@@ -291,7 +291,7 @@ void ChartsWidget::updateLayout(bool force) {
   auto charts_layout = charts_container->charts_layout;
   int n = MAX_COLUMN_COUNT;
   for (; n > 1; --n) {
-    if ((n * CHART_MIN_WIDTH + (n - 1) * charts_layout->spacing()) < charts_layout->geometry().width()) break;
+    if ((n * CHART_MIN_WIDTH + (n - 1) * charts_layout->horizontalSpacing()) < charts_layout->geometry().width()) break;
   }
 
   bool show_column_cb = n > 1;

tools/cabana/chart/chartswidget.h

@@ -59,6 +59,7 @@ private:
   ChartView *createChart();
   void removeChart(ChartView *chart);
   void splitChart(ChartView *chart);
+  QRect chartVisibleRect(ChartView *chart);
   void eventsMerged();
   void updateState();
   void zoomReset();

tools/cabana/chart/tiplabel.cc

@@ -22,18 +22,22 @@ TipLabel::TipLabel(QWidget *parent) : QLabel(parent, Qt::ToolTip | Qt::Frameless
   setVisible(false);
 }
 
-void TipLabel::showText(const QPoint &pt, const QString &text, int right_edge) {
+void TipLabel::showText(const QPoint &pt, const QString &text, QWidget *w, const QRect &rect) {
   setText(text);
   if (!text.isEmpty()) {
     QSize extra(1, 1);
     resize(sizeHint() + extra);
-    QPoint tip_pos(pt.x() + 12, pt.y());
-    if (tip_pos.x() + size().width() >= right_edge) {
+    QPoint tip_pos(pt.x() + 12, rect.top() + 2);
+    if (tip_pos.x() + size().width() >= rect.right()) {
       tip_pos.rx() = pt.x() - size().width() - 12;
     }
-    move(tip_pos);
+    if (rect.contains({tip_pos, size()})) {
+      move(w->mapToGlobal(tip_pos));
+      setVisible(true);
+      return;
     }
-  setVisible(!text.isEmpty());
+  }
+  setVisible(false);
 }
 
 void TipLabel::paintEvent(QPaintEvent *ev) {

tools/cabana/chart/tiplabel.h

@@ -5,6 +5,6 @@
 class TipLabel : public QLabel {
 public:
   TipLabel(QWidget *parent = nullptr);
-  void showText(const QPoint &pt, const QString &sec, int right_edge);
+  void showText(const QPoint &pt, const QString &sec, QWidget *w, const QRect &rect);
   void paintEvent(QPaintEvent *ev) override;
 };