Massive UI revamping (v7): better handling of expandable rollup sub widgets. Part of #1209

sdrgui/channel/channelgui.cpp

@@ -140,6 +140,7 @@ ChannelGUI::ChannelGUI(QWidget *parent) :
     m_topLayout->addWidget(m_closeButton);
 
     m_centerLayout = new QHBoxLayout();
+    m_centerLayout->setContentsMargins(0, 0, 0, 0);
     m_rollupContents = new RollupContents(); // Do not delete! Done in child's destructor with "delete ui"
     m_centerLayout->addWidget(m_rollupContents);
 

sdrgui/channel/channelgui.h

@@ -95,6 +95,7 @@ protected:
     void mouseMoveEvent(QMouseEvent* event) override;
     void resetContextMenuType() { m_contextMenuType = ContextMenuNone; }
     void updateIndexLabel();
+    int getAdditionalHeight() const { return 29 + 26; }
 
     DeviceType m_deviceType;
     int m_deviceSetIndex;

sdrgui/gui/rollupcontents.cpp

@@ -92,6 +92,36 @@ void RollupContents::setHighlighted(bool highlighted)
     }
 }
 
+int RollupContents::getAdditionalHeiht()
+{
+    int pos = 0;
+
+    for (int i = 0; i < children().count(); ++i)
+    {
+        QWidget* r = qobject_cast<QWidget*>(children()[i]);
+
+        if (r && isRollupChild(r) && !r->isHidden()) {
+            pos += 5;
+        }
+    }
+
+    return pos;
+}
+
+bool RollupContents::hasExpandableWidgets()
+{
+    for (int i = 0; i < children().count(); ++i)
+    {
+        QWidget* r = qobject_cast<QWidget*>(children()[i]);
+
+        if (r && isRollupChild(r) && !r->isHidden() && (r->sizePolicy().verticalPolicy() == QSizePolicy::Expanding)) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 int RollupContents::arrangeRollups()
 {
     QFontMetrics fm(font());

sdrgui/gui/rollupcontents.h

@@ -34,6 +34,8 @@ public:
     void saveState(RollupState& state) const;
     void restoreState(const RollupState& state);
     int arrangeRollups();
+    int getAdditionalHeiht();
+    bool hasExpandableWidgets();
 
 signals:
     void widgetRolled(QWidget* widget, bool rollDown);