From 4459a5f60db483bc3e63587b1c911ca98f415ec7 Mon Sep 17 00:00:00 2001
From: and3md <and3md@gmail.com>
Date: Wed, 22 Mar 2017 19:31:28 +0100
Subject: [PATCH 1/3] Ability to safe destroy widget later by event.

---
 src/dlangui/core/events.d               | 14 ++++++++++++++
 src/dlangui/platforms/common/platform.d |  8 +++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/dlangui/core/events.d b/src/dlangui/core/events.d
index 3caa30de..f7c95a0b 100644
--- a/src/dlangui/core/events.d
+++ b/src/dlangui/core/events.d
@@ -1649,6 +1649,20 @@ class RunnableEvent : CustomEvent {
     }
 }
 
+/// save destroy event
+class SafeDestroyEvent : RunnableEvent {
+    Widget _widgetToDestroy;
+    this (Widget widgetToDestroy)
+    {
+        _widgetToDestroy = widgetToDestroy;
+        super(1,null, delegate void () {
+            if (_widgetToDestroy.parent) 
+                _widgetToDestroy.parent.removeChild(_widgetToDestroy);
+            destroy(_widgetToDestroy);
+        });
+    }
+}
+
 interface CustomEventTarget {
     /// post event to handle in UI thread (this method can be used from background thread)
     void postEvent(CustomEvent event);
diff --git a/src/dlangui/platforms/common/platform.d b/src/dlangui/platforms/common/platform.d
index 63629585..b41617a9 100644
--- a/src/dlangui/platforms/common/platform.d
+++ b/src/dlangui/platforms/common/platform.d
@@ -519,7 +519,13 @@ class Window : CustomEventTarget {
         destroy(_timerQueue);
         _eventList = null;
     }
-
+    /// safe destroy widget
+    void safeWidgetDestroy(Widget widgetToDestroy)
+    {
+        SafeDestroyEvent ev = new SafeDestroyEvent(widgetToDestroy);
+        postEvent(ev);
+    }
+    
     private void animate(Widget root, long interval) {
         if (root is null)
             return;

From a99064eb03df0e4ede28465bed83be8cc3b50a41 Mon Sep 17 00:00:00 2001
From: and3md <and3md@gmail.com>
Date: Thu, 6 Apr 2017 18:46:01 +0200
Subject: [PATCH 2/3] Change name safeWidgetDestroy() and SaveDestroyEvent  to
 more accurate queueWidgetDestroy() and QueueDestroyEvent

---
 src/dlangui/core/events.d               | 4 ++--
 src/dlangui/platforms/common/platform.d | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/dlangui/core/events.d b/src/dlangui/core/events.d
index f7c95a0b..cf495e3d 100644
--- a/src/dlangui/core/events.d
+++ b/src/dlangui/core/events.d
@@ -1649,8 +1649,8 @@ class RunnableEvent : CustomEvent {
     }
 }
 
-/// save destroy event
-class SafeDestroyEvent : RunnableEvent {
+/// queue destroy event
+class QueueDestroyEvent : RunnableEvent {
     Widget _widgetToDestroy;
     this (Widget widgetToDestroy)
     {
diff --git a/src/dlangui/platforms/common/platform.d b/src/dlangui/platforms/common/platform.d
index b41617a9..abaa366a 100644
--- a/src/dlangui/platforms/common/platform.d
+++ b/src/dlangui/platforms/common/platform.d
@@ -519,10 +519,10 @@ class Window : CustomEventTarget {
         destroy(_timerQueue);
         _eventList = null;
     }
-    /// safe destroy widget
-    void safeWidgetDestroy(Widget widgetToDestroy)
+    /// queue destroy widget
+    void queueWidgetDestroy(Widget widgetToDestroy)
     {
-        SafeDestroyEvent ev = new SafeDestroyEvent(widgetToDestroy);
+        QueueDestroyEvent ev = new QueueDestroyEvent(widgetToDestroy);
         postEvent(ev);
     }
     

From 73944287adce43b5416c364b2bddb5e719fbde7f Mon Sep 17 00:00:00 2001
From: and3md <and3md@gmail.com>
Date: Sat, 8 Apr 2017 13:42:34 +0200
Subject: [PATCH 3/3] _widgetToDestroy should be private, enlarged
 documentation

---
 src/dlangui/core/events.d               |  9 +++++++--
 src/dlangui/platforms/common/platform.d | 13 ++++++++++++-
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/dlangui/core/events.d b/src/dlangui/core/events.d
index cf495e3d..5c3358ab 100644
--- a/src/dlangui/core/events.d
+++ b/src/dlangui/core/events.d
@@ -1649,9 +1649,14 @@ class RunnableEvent : CustomEvent {
     }
 }
 
-/// queue destroy event
+/**
+Queue destroy event.
+
+This event allows delayed widget destruction and is used internally by 
+$(LINK2 $(DDOX_ROOT_DIR)dlangui/platforms/common/platform/Window.queueWidgetDestroy.html, Window.queueWidgetDestroy()).
+*/
 class QueueDestroyEvent : RunnableEvent {
-    Widget _widgetToDestroy;
+    private Widget _widgetToDestroy;
     this (Widget widgetToDestroy)
     {
         _widgetToDestroy = widgetToDestroy;
diff --git a/src/dlangui/platforms/common/platform.d b/src/dlangui/platforms/common/platform.d
index abaa366a..399505c3 100644
--- a/src/dlangui/platforms/common/platform.d
+++ b/src/dlangui/platforms/common/platform.d
@@ -519,7 +519,18 @@ class Window : CustomEventTarget {
         destroy(_timerQueue);
         _eventList = null;
     }
-    /// queue destroy widget
+    
+    /**
+    Allows queue destroy of widget.
+    
+    Sometimes when you have very complicated UI with dynamic create/destroy lists of widgets calling simple destroy() 
+    on widget makes segmentation fault.
+    
+    Usually because you destroy widget that on some stage call another that tries to destroy widget that calls it.
+    When the control flow returns widget not exist and you have seg. fault.
+    
+    This function use internally $(LINK2 $(DDOX_ROOT_DIR)dlangui/core/events/QueueDestroyEvent.html, QueueDestroyEvent).
+    */
     void queueWidgetDestroy(Widget widgetToDestroy)
     {
         QueueDestroyEvent ev = new QueueDestroyEvent(widgetToDestroy);