From 532543395a63ebda0c189ee42b459fa4daeb1cc9 Mon Sep 17 00:00:00 2001
From: guy <guy@finereport.com>
Date: Tue, 7 Dec 2021 19:22:42 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=AF=E6=8C=81BI.useContext?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 examples/useContext.html | 94 ++++++++++++++++++++++++++++++++++++++++
 src/core/4.widget.js     | 36 +++++++++++++--
 2 files changed, 127 insertions(+), 3 deletions(-)
 create mode 100644 examples/useContext.html
diff --git a/examples/useContext.html b/examples/useContext.html
new file mode 100644
index 000000000..8762ba34c
--- /dev/null
+++ b/examples/useContext.html
@@ -0,0 +1,94 @@
+<html>
+<head>
+    <meta charset="utf-8">
+    <title></title>
+    <!-- <link rel="stylesheet" type="text/css" href="../dist/2.0/fineui.min.css"/>
+    <script src="../dist/2.0/fineui.js"></script> -->
+    <link rel="stylesheet" type="text/css" href="http://fanruan.design/fineui/2.0/fineui.min.css"/>
+    <script src="http://fanruan.design/fineui/2.0/fineui.min.js"></script>
+</head>
+<body>
+<div id="wrapper"></div>
+<script>
+    // tab上下文环境测试
+    var Model = BI.inherit(BI.Model, {
+        state: function () {
+            return {
+                expand: false
+            };
+        },
+        childContext: ["text"],
+
+        computed: {
+            text: function () {
+                return this.model.expand ? "text-yes" : "text-not";
+            }
+        },
+
+        actions: {
+            toggle: function () {
+                this.model.expand = !this.model.expand;
+            }
+        }
+    });
+    BI.model("demo.model", Model);
+
+    var Child = BI.inherit(BI.Widget, {
+        render: function () {
+            var label;
+            var context = BI.useContext();
+            setInterval(function () {
+                context.toggle();
+            }, 1000);
+            BI.watch(context, "expand", function () {
+                label.setText(context.model.text);
+            });
+            return {
+                type: "bi.label",
+                ref: function (_ref) {
+                    label = _ref;
+                },
+                text: function () {
+                    return context.model.text;
+                }
+            };
+        }
+    });
+    BI.shortcut("demo.child", Child);
+
+    var Widget = BI.inherit(BI.Widget, {
+        _store: function () {
+            return BI.Models.getModel("demo.model");
+        },
+        setup: function () {
+            var child;
+            var store = BI.useStore();
+            return function () {
+                return {
+                    type: "bi.vertical",
+                    vgap: 20,
+                    items: [{
+                        type: "demo.child",
+                        ref: function (_ref) {
+                            child = _ref;
+                        }
+                    }]
+                };
+            };
+        }
+    });
+    BI.shortcut("demo.parent", Widget);
+    BI.createWidget({
+        type: "bi.absolute",
+        items: [{
+            el: {
+                type: "demo.parent"
+            },
+            top: 100,
+            left: 100
+        }],
+        element: "#wrapper"
+    });
+</script>
+</body>
+</html>
diff --git a/src/core/4.widget.js b/src/core/4.widget.js
index c104a03c5..fcd71aab3 100644
--- a/src/core/4.widget.js
+++ b/src/core/4.widget.js
@@ -768,10 +768,40 @@
         }
     };
 
-    BI.watch = function (watch, handler) {
+    BI.useContext = function () {
+        return BI.Model.target;
+    };
+
+    BI.watch = function (vm, watch, handler, options) {
         if (BI.Widget.current) {
-            BI.Widget.current.$watchDelayCallbacks || (BI.Widget.current.$watchDelayCallbacks = []);
-            BI.Widget.current.$watchDelayCallbacks.push([watch, handler]);
+            options = options || {};
+            if (vm instanceof BI.Model) {
+                BI.Widget.current._watchers || (BI.Widget.current._watchers = []);
+                if (BI.isKey(watch)) {
+                    var k = watch;
+                    watch = {};
+                    watch[k] = handler;
+                }
+                for (var key in watch) {
+                    var handler = watch[key];
+                    if (BI.isArray(handler)) {
+                        for (var i = 0; i < handler.length; i++) {
+                            BI.Widget.current._watchers.push(Fix.watch(vm.model, key, handler, BI.extend(options, {
+                                store: vm.store
+                            })));
+                        }
+                    } else {
+                        BI.Widget.current._watchers.push(Fix.watch(vm.model, key, handler, BI.extend(options, {
+                            store: vm.store
+                        })));
+                    }
+                }
+            } else {
+                handler = watch;
+                watch = vm;
+                BI.Widget.current.$watchDelayCallbacks || (BI.Widget.current.$watchDelayCallbacks = []);
+                BI.Widget.current.$watchDelayCallbacks.push([watch, handler]);
+            }
         }
     };
 
