Make Popup dodge the screen edge

[pulseview.git] / pv / widgets / popup.cpp

diff --git a/pv/widgets/popup.cpp b/pv/widgets/popup.cpp
index 9863887ed5dab9595e69f6c8ba5b1308186223dd..73ac1d84bd81eb5d268bd48c82492c6d84afc935 100644 (file)
--- a/pv/widgets/popup.cpp
+++ b/pv/widgets/popup.cpp
@@ -64,6 +64,34 @@ void Popup::set_position(const QPoint point, Position pos)
 
 }
 
+bool Popup::space_for_arrow() const
+{
+       // Check if there is room for the arrow
+       switch (_pos) {
+       case Right:
+               if (_point.x() > x())
+                       return false;
+               return true;
+
+       case Bottom:
+               if (_point.y() > y())
+                       return false;
+               return true;            
+
+       case Left:
+               if (_point.x() < (x() + width()))
+                       return false;
+               return true;
+
+       case Top:
+               if (_point.y() < (y() + height()))
+                       return false;
+               return true;
+       }
+
+       return true;
+}
+
 QPolygon Popup::arrow_polygon() const
 {
        QPolygon poly;
@@ -144,13 +172,19 @@ QRegion Popup::bubble_region() const
 
 QRegion Popup::popup_region() const
 {
-       return arrow_region().united(bubble_region());
+       if (space_for_arrow())
+               return arrow_region().united(bubble_region());
+       else
+               return bubble_region();
 }
 
 void Popup::reposition_widget()
 {
        QPoint o;
 
+       const QRect screen_rect = QApplication::desktop()->availableGeometry(
+               QApplication::desktop()->screenNumber(_point));
+
        if (_pos == Right || _pos == Left)
                o.ry() = -height() / 2;
        else
@@ -161,7 +195,11 @@ void Popup::reposition_widget()
        else if(_pos == Top)
                o.ry() = -height();
 
-       move(_point + o);
+       o += _point;
+       move(max(min(o.x(), screen_rect.right() - width()),
+                       screen_rect.left()),
+               max(min(o.y(), screen_rect.bottom() - height()),
+                       screen_rect.top()));
 }
 
 void Popup::closeEvent(QCloseEvent*)
@@ -177,6 +215,7 @@ void Popup::paintEvent(QPaintEvent*)
        const QColor outline_color(QApplication::palette().color(
                QPalette::Dark));
 
+       // Draw the bubble
        const QRegion b = bubble_region();
        const QRegion bubble_outline = QRegion(rect()).subtracted(
                b.translated(1, 0).intersected(b.translated(0, 1).intersected(
@@ -186,6 +225,10 @@ void Popup::paintEvent(QPaintEvent*)
        painter.setBrush(QApplication::palette().brush(QPalette::Window));
        painter.drawRect(rect());
 
+       // Draw the arrow
+       if (!space_for_arrow())
+               return;
+
        const QPoint ArrowOffsets[] = {
                QPoint(1, 0), QPoint(0, -1), QPoint(-1, 0), QPoint(0, 1)};