Allow configuring a callback to create tool windows on-demand

* This means we can start with an empty manager, load a layout, and just
  create the needed windows as we go according to what the layout needs.

qrenderdoc/3rdparty/toolwindowmanager/ToolWindowManager.cpp

@@ -66,6 +66,7 @@ ToolWindowManager::ToolWindowManager(QWidget *parent) :
   m_dropSuggestionSwitchTimer.setInterval(1000);
   m_dropCurrentSuggestionIndex = 0;
   m_allowFloatingWindow = true;
+  m_createCallback = NULL;
 
   m_rectRubberBand = new QRubberBand(QRubberBand::Rectangle, this);
   m_lineRubberBand = new QRubberBand(QRubberBand::Line, this);
@@ -271,6 +272,21 @@ void ToolWindowManager::removeToolWindow(QWidget *toolWindow) {
   m_toolWindowProperties.remove(toolWindow);
 }
 
+QWidget* ToolWindowManager::createToolWindow(const QString& objectName)
+{
+  if (m_createCallback) {
+    QWidget *toolWindow = m_createCallback(objectName);
+    if(toolWindow) {
+      m_toolWindows << toolWindow;
+      m_toolWindowProperties[toolWindow] = ToolWindowProperty(0);
+      QObject::connect(toolWindow, &QWidget::windowTitleChanged, this, &ToolWindowManager::windowTitleChanged);
+      return toolWindow;
+    }
+  }
+
+  return NULL;
+}
+
 void ToolWindowManager::setSuggestionSwitchInterval(int msec) {
   m_dropSuggestionSwitchTimer.setInterval(msec);
 }

qrenderdoc/3rdparty/toolwindowmanager/ToolWindowManager.h

@@ -35,6 +35,8 @@
 #include <QVariant>
 #include <QLabel>
 
+#include <functional>
+
 class ToolWindowManagerArea;
 class ToolWindowManagerWrapper;
 
@@ -240,6 +242,12 @@ public:
    */
   void restoreState(const QVariantMap& data);
 
+  typedef std::function<QWidget*(const QString &)> CreateCallback;
+
+  void setToolWindowCreateCallback(const CreateCallback &cb) { m_createCallback = cb; }
+  QWidget *createToolWindow(const QString& objectName);
+
+  bool checkValidSplitter(QWidget *w);
 
   /*! \cond PRIVATE */
   void setSuggestionSwitchInterval(int msec);
@@ -289,6 +297,8 @@ private:
                                     // (e.g. always 0 if there is only one possible drop location)
   QTimer m_dropSuggestionSwitchTimer; // used for switching drop suggestions
 
+  CreateCallback m_createCallback;
+
   // last widget used for adding tool windows, or 0 if there isn't one
   // (warning: may contain pointer to deleted object)
   ToolWindowManagerArea* m_lastUsedArea;

qrenderdoc/3rdparty/toolwindowmanager/ToolWindowManagerArea.cpp

@@ -186,6 +186,7 @@ void ToolWindowManagerArea::restoreState(const QVariantMap &data) {
         break;
       }
     }
+    if (t == NULL) t = m_manager->createToolWindow(objectName);
     if (t) {
         t->setProperty("persistData", objectData["data"]);
         addToolWindow(t);