Cache signal label text size at draw time for later use

[pulseview.git] / pv / signal.cpp

diff --git a/pv/signal.cpp b/pv/signal.cpp
index 1a11cfeec1909d39c7a2ffeca54c24b91899dc80..091dd8d4406ef62dfc56b325c96f770890342323 100644 (file)
--- a/pv/signal.cpp
+++ b/pv/signal.cpp
@@ -25,6 +25,7 @@
 namespace pv {
 
 const QSizeF Signal::LabelPadding(4, 0);
+const int Signal::LabelHitPadding = 2;
 
 Signal::Signal(QString name) :
        _name(name)
@@ -36,29 +37,15 @@ QString Signal::get_name() const
        return _name;
 }
 
-QRectF Signal::get_label_rect(QPainter &p, const QRect &rect)
-{
-       const QSizeF text_size = p.boundingRect(
-               QRectF(0, 0, rect.width(), 0), 0, _name).size();
-
-       const float nominal_offset = get_nominal_offset(rect);
-       const QSizeF label_size(
-               text_size.width() + LabelPadding.width() * 2,
-               text_size.height() + LabelPadding.height() * 2);
-       const float label_arrow_length = label_size.height() / 2;
-       return QRectF(
-               rect.right() - label_arrow_length - label_size.width(),
-               nominal_offset - label_size.height() / 2,
-               label_size.width(), label_size.height());
-}
-
-void Signal::paint_label(QPainter &p, const QRect &rect)
+void Signal::paint_label(QPainter &p, const QRect &rect, bool hover)
 {
        p.setBrush(get_colour());
 
        const QColor colour = get_colour();
        const float nominal_offset = get_nominal_offset(rect);
-       const QRectF label_rect = get_label_rect(p, rect);
+
+       compute_text_size(p);
+       const QRectF label_rect = get_label_rect(rect);
 
        // Paint the label
        const QPointF points[] = {
@@ -78,7 +65,7 @@ void Signal::paint_label(QPainter &p, const QRect &rect)
        };
 
        p.setPen(Qt::transparent);
-       p.setBrush(colour);
+       p.setBrush(hover ? colour.lighter() : colour);
        p.drawPolygon(points, countof(points));
 
        p.setPen(colour.lighter());
@@ -94,4 +81,33 @@ void Signal::paint_label(QPainter &p, const QRect &rect)
        p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, _name);
 }
 
+bool Signal::pt_in_label_rect(const QRect &rect, const QPoint &point)
+{
+       const QRectF label = get_label_rect(rect);
+       return QRectF(
+               QPointF(label.left() - LabelHitPadding,
+                       label.top() - LabelHitPadding),
+               QPointF(rect.right(),
+                       label.bottom() + LabelHitPadding)
+               ).contains(point);
+}
+
+void Signal::compute_text_size(QPainter &p)
+{
+       _text_size = p.boundingRect(QRectF(), 0, _name).size();
+}
+
+QRectF Signal::get_label_rect(const QRect &rect)
+{
+       const float nominal_offset = get_nominal_offset(rect);
+       const QSizeF label_size(
+               _text_size.width() + LabelPadding.width() * 2,
+               _text_size.height() + LabelPadding.height() * 2);
+       const float label_arrow_length = label_size.height() / 2;
+       return QRectF(
+               rect.right() - label_arrow_length - label_size.width(),
+               nominal_offset - label_size.height() / 2,
+               label_size.width(), label_size.height());
+}
+
 } // namespace pv