Added an option for centring a ThreadWithProgressWindow around a component.

modules/juce_gui_basics/windows/juce_ThreadWithProgressWindow.cpp

@@ -27,7 +27,8 @@ ThreadWithProgressWindow::ThreadWithProgressWindow (const String& title,
                                                     const bool hasProgressBar,
                                                     const bool hasCancelButton,
                                                     const int timeOutMsWhenCancelling_,
-                                                    const String& cancelButtonText)
+                                                    const String& cancelButtonText,
+                                                    Component* componentToCentreAround)
   : Thread ("Juce Progress Window"),
     progress (0.0),
     timeOutMsWhenCancelling (timeOutMsWhenCancelling_)
@@ -35,7 +36,8 @@ ThreadWithProgressWindow::ThreadWithProgressWindow (const String& title,
     alertWindow = LookAndFeel::getDefaultLookAndFeel()
                     .createAlertWindow (title, String::empty, cancelButtonText,
                                         String::empty, String::empty,
-                                        AlertWindow::NoIcon, hasCancelButton ? 1 : 0, 0);
+                                        AlertWindow::NoIcon, hasCancelButton ? 1 : 0,
+                                        componentToCentreAround);
 
     // if there are no buttons, we won't allow the user to interrupt the thread.
     alertWindow->setEscapeKeyCancels (false);

modules/juce_gui_basics/windows/juce_ThreadWithProgressWindow.h

@@ -100,12 +100,15 @@ public:
                                         Thread::stopThread() )
         @param cancelButtonText         the text that should be shown in the cancel button
                                         (if it has one)
+        @param componentToCentreAround  if this is non-null, the window will be positioned
+                                        so that it's centred around this component.
     */
     ThreadWithProgressWindow (const String& windowTitle,
                               bool hasProgressBar,
                               bool hasCancelButton,
                               int timeOutMsWhenCancelling = 10000,
-                              const String& cancelButtonText = "Cancel");
+                              const String& cancelButtonText = "Cancel",
+                              Component* componentToCentreAround = nullptr);
 
     /** Destructor. */
     ~ThreadWithProgressWindow();