basic style cache

Author: ianharrigan

haxe/ui/core/Component.hx

@@ -1243,6 +1243,30 @@ class Component extends ComponentImpl
     // Style related
     //***********************************************************************************************************
 
+    private var _styleCacheKey:String = null;
+    private var styleCacheKey(get, never):String;
+    private function get_styleCacheKey():String {
+        if (_styleCacheKey == null) {
+            var sb = new StringBuf();
+            var ref = this;
+            do {
+                sb.add(ref.className);
+                sb.add("_id:");
+                sb.add(ref.id);
+                sb.add("_classes:");
+                for (c in ref.classes) {
+                    sb.add(c);
+                    sb.add("|");
+                }
+                ref = ref.parentComponent;
+            } while (ref != null);
+
+            //_styleCacheKey = sb.toString();
+            return sb.toString();
+        }
+        return _styleCacheKey;
+    }
+
     @:noCompletion private var _customStyle:Style = null;
 
     /**

haxe/ui/styles/StyleSheet.hx

@@ -3,6 +3,7 @@ package haxe.ui.styles;
 import haxe.crypto.Sha1;
 import haxe.ui.core.Component;
 import haxe.ui.styles.elements.AnimationKeyFrames;
+import haxe.ui.styles.elements.Directive;
 import haxe.ui.styles.elements.ImportElement;
 import haxe.ui.styles.elements.MediaQuery;
 import haxe.ui.styles.elements.RuleElement;
@@ -142,18 +143,45 @@ class StyleSheet {
         }
     }
 
+    private var _componentStyleCache = new Map<String, Array<Map<String, Directive>>>();
+
     public function buildStyleFor(c:Component, style:Style = null):Style {
         if (style == null) {
             style = {};
         }
-        for (r in rules) {
-            if (!r.match(c)) {
-                continue;
+
+        var styleCacheKey = @:privateAccess c.styleCacheKey;
+
+        var cachedDirectives = _componentStyleCache.get(styleCacheKey);
+        if (cachedDirectives != null) {
+            for (directives in cachedDirectives) {
+                style.mergeDirectives(directives);
+            }
+            /*
+            var n = 0;
+            for (_ in _componentStyleCache.keys()) {
+                n++;
+            }
+            trace(n);
+            */
+        } else {
+            //trace(styleCacheKey);
+            cachedDirectives = [];
+            for (r in rules) {
+                if (!r.match(c)) {
+                    continue;
+                }
+    
+                cachedDirectives.push(r.directives);
             }
 
-            style.mergeDirectives(r.directives);
+            for (directives in cachedDirectives) {
+                style.mergeDirectives(directives);
+            }
+            _componentStyleCache.set(styleCacheKey, cachedDirectives);
         }
 
+
         return style;
     }
 }