From c8734ae98b19adf61d3633d16916e6b28d215b13 Mon Sep 17 00:00:00 2001
From: Cyberarm <matthewlikesrobots@gmail.com>
Date: Fri, 24 Dec 2021 17:00:02 -0600
Subject: [PATCH] Container child elements that are not visible are no longer
 drawn

---
 lib/cyberarm_engine/ui/element.rb            | 8 +++++++-
 lib/cyberarm_engine/ui/elements/container.rb | 3 +++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/cyberarm_engine/ui/element.rb b/lib/cyberarm_engine/ui/element.rb
index d44cc94..fd33713 100644
--- a/lib/cyberarm_engine/ui/element.rb
+++ b/lib/cyberarm_engine/ui/element.rb
@@ -4,7 +4,7 @@ module CyberarmEngine
     include Event
     include Common
 
-    attr_accessor :x, :y, :z, :tip
+    attr_accessor :x, :y, :z, :tip, :element_visible
     attr_reader :parent, :options, :style, :event_handler, :background_canvas, :border_canvas
 
     def initialize(options = {}, block = nil)
@@ -24,6 +24,7 @@ module CyberarmEngine
 
       @root ||= nil
       @gui_state ||= nil
+      @element_visible = true
 
       @x = @style.x
       @y = @style.y
@@ -260,6 +261,10 @@ module CyberarmEngine
       @visible
     end
 
+    def element_visible?
+      @element_visible
+    end
+
     def toggle
       @visible = !@visible
       root.gui_state.request_recalculate
@@ -279,6 +284,7 @@ module CyberarmEngine
 
     def draw
       return unless visible?
+      return unless element_visible?
 
       @style.background_canvas.draw
       @style.background_nine_slice_canvas.draw
diff --git a/lib/cyberarm_engine/ui/elements/container.rb b/lib/cyberarm_engine/ui/elements/container.rb
index c0a9611..1de5fd0 100644
--- a/lib/cyberarm_engine/ui/elements/container.rb
+++ b/lib/cyberarm_engine/ui/elements/container.rb
@@ -129,6 +129,9 @@ module CyberarmEngine
           child.reposition # TODO: Implement top,bottom,left,center, and right positioning
 
           Stats.increment(:gui_recalculations_last_frame, 1)
+
+          child.element_visible = child.x >= @x - child.width && child.x <= @x + width &&
+                                  child.y >= @y - child.height && child.y <= @y + height
         end
 
         update_background