Display pipeline properties in a scroll area

To stop the widget that contains pipeline properties from constant
resizing and taking space away from other widgets, its contents were put
in a scroll area that only resizes horizontally, and scrolls vertically.

application/gui/mainwindow.cpp

@@ -39,6 +39,7 @@
 #include "core/pipeline/abstractprocessor.h"
 
 #include <QMdiSubWindow>
+#include <QScrollBar>
 
 namespace campvis {
 
@@ -83,24 +84,31 @@ namespace campvis {
         _pipelineWidget = new PipelineTreeWidget();
         ui.pipelineTreeDock->setWidget(_pipelineWidget);
 
-        QWidget* rightWidget = new QWidget();
-        ui.pipelinePropertiesDock->setWidget(rightWidget);
+        _pipelinePropertiesScrollArea = new QScrollArea();
+        _pipelinePropertiesScrollArea->setWidgetResizable(true);
+        _pipelinePropertiesScrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+        _pipelinePropertiesScrollArea->setFrameStyle(QScrollArea::NoFrame);
+
+        _pipelinePropertiesWidget = new QWidget();
+        _pipelinePropertiesWidget->installEventFilter(this);
+        _pipelinePropertiesScrollArea->setWidget(_pipelinePropertiesWidget);
+        ui.pipelinePropertiesDock->setWidget(_pipelinePropertiesScrollArea);
 
         QVBoxLayout* rightLayout = new QVBoxLayout();
         rightLayout->setSpacing(4);
-        rightWidget->setLayout(rightLayout);
+        _pipelinePropertiesWidget->setLayout(rightLayout);
 
-        _btnExecute = new QPushButton("Execute Selected Pipeline/Processor", rightWidget);
+        _btnExecute = new QPushButton("Execute Selected Pipeline/Processor");
         rightLayout->addWidget(_btnExecute);
 
-        _btnShowDataContainerInspector = new QPushButton("Inspect DataContainer of Selected Pipeline", rightWidget);
+        _btnShowDataContainerInspector = new QPushButton("Inspect DataContainer of Selected Pipeline");
         rightLayout->addWidget(_btnShowDataContainerInspector);
 
         _propCollectionWidget = new PropertyCollectionWidget();
         rightLayout->addWidget(_propCollectionWidget);
+        rightLayout->addStretch();
 
         _logViewer = new LogViewerWidget();
-        ui.logViewerDock->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);
         ui.logViewerDock->setWidget(_logViewer);
 
         _dcInspectorWidget = new DataContainerInspectorWidget();
@@ -123,6 +131,15 @@ namespace campvis {
         _application->s_PipelinesChanged.connect(this, &MainWindow::onPipelinesChanged);
     }
 
+    bool MainWindow::eventFilter(QObject* watched, QEvent* event) {
+        if (watched == _pipelinePropertiesWidget && event->type() == QEvent::Resize) {
+            _pipelinePropertiesScrollArea->setMinimumWidth(_pipelinePropertiesWidget->minimumSizeHint().width() +
+                                                           _pipelinePropertiesScrollArea->verticalScrollBar()->width());
+        }
+
+        return false;
+    }
+
     void MainWindow::onPipelinesChanged() {
         emit updatePipelineWidget(_application->_pipelines);
     }

application/gui/mainwindow.h

@@ -43,6 +43,7 @@
 #include <QHBoxLayout>
 #include <QPushButton>
 #include <QMdiArea>
+#include <QScrollArea>
 #include <vector>
 
 namespace campvis {
@@ -54,7 +55,7 @@ namespace campvis {
      * Wraps a nice Qt GUI around the CampVisApplication instance given during creation.
      */
     class MainWindow : public QMainWindow, public sigslot::has_slots<> {
-        Q_OBJECT;
+        Q_OBJECT
 
     public:
         /**
@@ -97,6 +98,14 @@ namespace campvis {
          */
         void addVisualizationPipelineWidget(const std::string& name, QWidget* canvas);
 
+    protected:
+        /**
+         * Listens to resize events on _pipelinePropertiesWidget and resizes _pipelinePropertiesScrollArea accordingly
+         * \param   watched    the object that caused the event
+         * \param   event      the event to be filtered
+         */
+        bool eventFilter(QObject* watched, QEvent* event);
+
     signals:
         /// Qt signal for updating the PipelineWidget.
         void updatePipelineWidget(const std::vector<AbstractPipeline*>&);
@@ -144,6 +153,8 @@ namespace campvis {
 
         QMdiArea* _mdiArea;                                 ///< MDI area (the window's central widget)
         PipelineTreeWidget* _pipelineWidget;                ///< Widget for browsing the active pipelines
+        QWidget* _pipelinePropertiesWidget;                 ///< Widget showing the selected pipeline's properties
+        QScrollArea* _pipelinePropertiesScrollArea;         ///< Scroll area for _pipelinePropertiesWidget
         PropertyCollectionWidget* _propCollectionWidget;    ///< Widget for brosing the PropertyCollection of the selected pipeline/processor
         DataContainerInspectorWidget* _dcInspectorWidget;   ///< Widget for inspecting the DataContainer of the selected pipeline.
         QDockWidget* _dcInspectorDock;                      ///< Dock storing the above DataContainerInspectorWidget instance.