From ead1cff962593c0f6c4433125a6c0a41c7ee385e Mon Sep 17 00:00:00 2001
From: Denis Feklushkin <denis.feklushkin@gmail.com>
Date: Thu, 26 Oct 2017 20:44:02 +0700
Subject: [PATCH 1/4] const added

---
 src/dlangui/widgets/controls.d | 2 +-
 src/dlangui/widgets/widget.d   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/dlangui/widgets/controls.d b/src/dlangui/widgets/controls.d
index 18d54d0b..b5db5363 100644
--- a/src/dlangui/widgets/controls.d
+++ b/src/dlangui/widgets/controls.d
@@ -95,7 +95,7 @@ class TextWidget : Widget {
 
     protected UIString _text;
     /// get widget text
-    override @property dstring text() { return _text; }
+    override @property dstring text() const { return _text; }
     /// set text to show
     override @property Widget text(dstring s) { 
         _text = s; 
diff --git a/src/dlangui/widgets/widget.d b/src/dlangui/widgets/widget.d
index 3ac0e600..8f2be7af 100644
--- a/src/dlangui/widgets/widget.d
+++ b/src/dlangui/widgets/widget.d
@@ -1739,7 +1739,7 @@ class WidgetGroup : Widget {
     protected WidgetList _children;
 
     /// returns number of children of this widget
-    @property override int childCount() { return _children.count; }
+    @property override int childCount() const { return _children.count; }
     /// returns child by index
     override Widget child(int index) { return _children.get(index); }
     /// adds child, returns added item

From 9c85ab7deb42c64dba0017f2f9fbc1d22b8977ad Mon Sep 17 00:00:00 2001
From: Denis Feklushkin <denis.feklushkin@gmail.com>
Date: Thu, 26 Oct 2017 22:00:51 +0700
Subject: [PATCH 2/4] child(int) works with const widget objects too

---
 src/dlangui/core/collections.d | 7 +------
 src/dlangui/widgets/widget.d   | 4 ++--
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/src/dlangui/core/collections.d b/src/dlangui/core/collections.d
index 223508d4..23e9bef8 100644
--- a/src/dlangui/core/collections.d
+++ b/src/dlangui/core/collections.d
@@ -244,12 +244,7 @@ struct ObjectList(T) {
     @property int count() const { return _count; }
     alias length = count;
     /** get item by index */
-    T get(int index) {
-        assert(index >= 0 && index < _count, "child index out of range");
-        return _list[index];
-    }
-    /** get const item by index */
-    const(T) get(int index)  const {
+    inout(T) get(int index) inout {
         assert(index >= 0 && index < _count, "child index out of range");
         return _list[index];
     }
diff --git a/src/dlangui/widgets/widget.d b/src/dlangui/widgets/widget.d
index 8f2be7af..fd3a2f8d 100644
--- a/src/dlangui/widgets/widget.d
+++ b/src/dlangui/widgets/widget.d
@@ -1525,7 +1525,7 @@ public:
     /// returns number of children of this widget
     @property int childCount() { return 0; }
     /// returns child by index
-    Widget child(int index) { return null; }
+    inout(Widget) child(int index) inout { return null; }
     /// adds child, returns added item
     Widget addChild(Widget item) { assert(false, "addChild: children not suported for this widget type"); }
     /// adds child, returns added item
@@ -1741,7 +1741,7 @@ class WidgetGroup : Widget {
     /// returns number of children of this widget
     @property override int childCount() const { return _children.count; }
     /// returns child by index
-    override Widget child(int index) { return _children.get(index); }
+    override inout(Widget) child(int index) inout { return _children.get(index); }
     /// adds child, returns added item
     override Widget addChild(Widget item) { return _children.add(item).parent(this); }
     /// inserts child at given index, returns inserted item

From 6db5d2cece846932f46f5784c6b136477c087054 Mon Sep 17 00:00:00 2001
From: Denis Feklushkin <denis.feklushkin@gmail.com>
Date: Thu, 26 Oct 2017 22:05:37 +0700
Subject: [PATCH 3/4] childCount() const

---
 src/dlangui/widgets/widget.d | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dlangui/widgets/widget.d b/src/dlangui/widgets/widget.d
index fd3a2f8d..7111524a 100644
--- a/src/dlangui/widgets/widget.d
+++ b/src/dlangui/widgets/widget.d
@@ -1523,7 +1523,7 @@ public:
     // Widget hierarhy methods
 
     /// returns number of children of this widget
-    @property int childCount() { return 0; }
+    @property int childCount() const { return 0; }
     /// returns child by index
     inout(Widget) child(int index) inout { return null; }
     /// adds child, returns added item

From 925224fdf80768640a3c4bcdd5a28b8cf90dae98 Mon Sep 17 00:00:00 2001
From: Denis Feklushkin <denis.feklushkin@gmail.com>
Date: Fri, 27 Oct 2017 15:21:15 +0700
Subject: [PATCH 4/4] class Button text() const

---
 src/dlangui/widgets/controls.d | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/dlangui/widgets/controls.d b/src/dlangui/widgets/controls.d
index b5db5363..d5c65705 100644
--- a/src/dlangui/widgets/controls.d
+++ b/src/dlangui/widgets/controls.d
@@ -529,7 +529,7 @@ class RadioButton : ImageTextButton {
 /// Text only button
 class Button : Widget {
     protected UIString _text;
-    override @property dstring text() { return _text; }
+    override @property dstring text() const { return _text; }
     override @property Widget text(dstring s) { _text = s; requestLayout(); return this; }
     override @property Widget text(UIString s) { _text = s; requestLayout(); return this; }
     @property Widget textResource(string s) { _text = s; requestLayout(); return this; }