Add the ability to create spacers, for better layouts

qrenderdoc/Code/Interface/Extensions.h

@@ -513,6 +513,19 @@ which typically has some widgets be only large enough for their content and othe
 )");
   virtual QWidget *CreateGridContainer() = 0;
 
+  DOCUMENT(R"(Creates and returns a spacer widget.
+
+This widget is completely empty but consumes empty space, meaning all other non-greedy widgets in
+the same container will be minimally sized. This can be useful for simple layouts.
+
+:param bool horizontal: ``True`` if this spacer should consume horizontal space, ``False`` if this
+  spacer should consume vertical space. Typically this matches the direction of the layout it is
+  in.
+:return: The handle to the newly created widget.
+:rtype: ``QWidget``
+)");
+  virtual QWidget *CreateSpacer(bool horizontal) = 0;
+
   DOCUMENT(R"(Removes all child widgets from a parent and makes them invisible.
 
 These widgets remain valid and can be re-added to another parent or the same parent.

qrenderdoc/Code/MiniQtHelper.cpp

@@ -220,6 +220,15 @@ QWidget *MiniQtHelper::CreateGridContainer()
   return ret;
 }
 
+QWidget *MiniQtHelper::CreateSpacer(bool horizontal)
+{
+  QWidget *ret = new QWidget();
+  ret->setSizePolicy(horizontal ? QSizePolicy::Expanding : QSizePolicy::Preferred,
+                     horizontal ? QSizePolicy::Preferred : QSizePolicy::Expanding);
+  ret->setMinimumSize(1, 1);
+  return ret;
+}
+
 void MiniQtHelper::ClearContainedWidgets(QWidget *parent)
 {
   if(!parent)
@@ -427,6 +436,7 @@ QWidget *MiniQtHelper::CreateGroupBox(bool collapsible)
     ret = new CollapseGroupBox();
   else
     ret = new QGroupBox();
+  ret->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
   ret->setLayout(new QVBoxLayout());
   return ret;
 }
@@ -449,6 +459,7 @@ QWidget *MiniQtHelper::CreateOutputRenderingWidget()
 {
   CustomPaintWidget *widget = new CustomPaintWidget(NULL);
   widget->SetContext(m_Ctx);
+  widget->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
   return widget;
 }
 
@@ -597,6 +608,7 @@ QWidget *MiniQtHelper::CreateTextBox(bool singleLine, WidgetCallback changed)
       AddWidgetCallback(w, QObject::connect(w, &RDTextEdit::textChanged, [this, w, changed]() {
                           changed(&m_Ctx, w, w->toPlainText());
                         }));
+    w->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
     return w;
   }
 }

qrenderdoc/Code/MiniQtHelper.h

@@ -58,6 +58,7 @@ public:
   QWidget *CreateHorizontalContainer() override;
   QWidget *CreateVerticalContainer() override;
   QWidget *CreateGridContainer() override;
+  QWidget *CreateSpacer(bool horizontal) override;
 
   void ClearContainedWidgets(QWidget *parent) override;
   void AddGridWidget(QWidget *parent, int row, int column, QWidget *child, int rowSpan,

qrenderdoc/Windows/PythonShell.cpp

@@ -150,7 +150,10 @@ struct MiniQtInvoker : ObjectForwarder<IMiniQtHelper>
   {
     return InvokeRetFunction<QWidget *>(&IMiniQtHelper::CreateGridContainer);
   }
-
+  QWidget *CreateSpacer(bool horizontal)
+  {
+    return InvokeRetFunction<QWidget *>(&IMiniQtHelper::CreateSpacer, horizontal);
+  }
   void ClearContainedWidgets(QWidget *parent)
   {
     InvokeVoidFunction(&IMiniQtHelper::ClearContainedWidgets, parent);