UI: Don't delete dock widget in VivyDocumentView

If the dock already exists in the VivyDocumentView, only recreate the
contained widget to preserve the dock position and size.

src/UI/VivyDocumentView.cc

@@ -2,6 +2,7 @@
 #include "PropertyModel.hh"
 #include "DocumentViews/AudioVisualizer.hh"
 #include "DocumentViews/AssLinesView.hh"
+#include "DocumentViews/AssLinesModel.hh"
 #include "../VivyApplication.hh"
 #include "../Lib/Document/VivyDocument.hh"
 
@@ -9,6 +10,8 @@
 #include <QTreeView>
 #include <QVBoxLayout>
 #include <QTableView>
+#include <QWidget>
+#include <QDockWidget>
 
 using namespace Vivy;
 
@@ -75,23 +78,25 @@ VivyDocumentView::getDocumentTabToolTip() const noexcept
 void
 VivyDocumentView::loadVideoView() noexcept
 {
+    if (document->checkDocumentCapabilities(VivyDocument::Capabilities::VideoAble)) {
+    }
 }
 
 void
 VivyDocumentView::loadAssView() noexcept
 {
-    if (assLines)
-        delDockWidget(&assLines);
-
     if (document->checkDocumentCapabilities(VivyDocument::Capabilities::AssAble)) {
-        assModel.reset(new AssLinesModel(document->getAssSubDocument()->getLines()));
+        if (!assLines) {
             assLines = new QDockWidget("ASS Lines", this);
-        assLines->setWidget(new AssLinesView(assModel.get(), assLines));
             assLines->setFeatures(QDockWidget::DockWidgetMovable | QDockWidget::DockWidgetClosable);
             assLines->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea |
                                       Qt::BottomDockWidgetArea);
             addDockWidget(Qt::BottomDockWidgetArea, assLines, Qt::Vertical);
         }
+
+        assModel.reset(new AssLinesModel(document->getAssSubDocument()->getLines()));
+        assLines->setWidget(new AssLinesView(assModel.get(), assLines));
+    }
 }
 
 void
@@ -108,23 +113,25 @@ VivyDocumentView::loadAudioView() noexcept
             return;
         }
 
-        if (visualizer)
-            delDockWidget(&visualizer);
+        if (!visualizer) {
             visualizer = new QDockWidget("Visualizer", this);
 
+            visualizer->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Minimum);
+            visualizer->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::TopDockWidgetArea |
+                                        Qt::BottomDockWidgetArea);
+            visualizer->setFeatures(QDockWidget::DockWidgetMovable |
+                                    QDockWidget::DockWidgetClosable);
+            addDockWidget(Qt::LeftDockWidgetArea, visualizer, Qt::Horizontal);
+        }
+
         AudioVisualizer *visualizerInner = new AudioVisualizer(stream, visualizer);
         if (visualizerInner == nullptr) {
             qCritical() << "Failed to create visualizer for" << audioDocument->getFilePath();
             return;
         }
 
-        visualizer->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Minimum);
         visualizer->setWidget(visualizerInner);
-        visualizer->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::TopDockWidgetArea |
-                                    Qt::BottomDockWidgetArea);
-        visualizer->setFeatures(QDockWidget::DockWidgetMovable | QDockWidget::DockWidgetClosable);
         visualizer->layout()->setAlignment(visualizerInner, Qt::AlignTop);
-        addDockWidget(Qt::LeftDockWidgetArea, visualizer, Qt::Horizontal);
     }
 
     else {
@@ -155,16 +162,17 @@ VivyDocumentView::getDocumentTabIcon() const noexcept
 void
 VivyDocumentView::openProperties() noexcept
 {
-    if (property)
-        delDockWidget(&property);
-
     propertyModel.reset(new PropertyModel(*document.get()));
-    property        = new QDockWidget("Properties", this);
     QTreeView *view = new QTreeView(property);
     view->setModel(propertyModel.get());
     view->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
     view->expandAll();
-    property->setWidget(view);
+
+    if (!property) {
+        property = new QDockWidget("Properties", this);
         property->setAllowedAreas(Qt::AllDockWidgetAreas);
         addDockWidget(Qt::RightDockWidgetArea, property, Qt::Vertical);
     }
+
+    property->setWidget(view);
+}

src/UI/VivyDocumentView.hh

@@ -5,17 +5,17 @@
 #error "This is a C++ header"
 #endif
 
-#include "../Lib/Document/VivyDocument.hh"
-#include "DocumentViews/AudioVisualizer.hh"
-#include "DocumentViews/AssLinesModel.hh"
 #include "AbstractDocumentView.hh"
-#include "PropertyModel.hh"
 
-#include <QWidget>
-#include <QDockWidget>
+class QDockWidget;
+class QWidget;
 
 namespace Vivy
 {
+class PropertyModel;
+class AssLinesModel;
+class VivyDocument;
+
 class VivyDocumentView final : public AbstractDocumentView {
     Q_OBJECT
     VIVY_UNMOVABLE_OBJECT(VivyDocumentView)
@@ -45,6 +45,7 @@ private:
     QDockWidget *visualizer{ nullptr };
     QDockWidget *property{ nullptr };
     QDockWidget *assLines{ nullptr };
+    QDockWidget *videoView{ nullptr };
 };
 
 }