feat: add switch

packages/switch/src/switch.pcss

@@ -0,0 +1,48 @@
+
+@component-namespace o2{
+  @component switch { 
+    height: 29px;
+    width: 49px;
+    display: inline-block;
+    border-radius: 16px;
+    position: relative;
+    border: 1px solid;
+
+    @descendent node {
+      width: 27px;
+      height: 27px;
+      border-radius: 100%;
+      background-color: #fff;
+      border: .5px solid rgba(0, 0, 0, .1);
+      position: absolute;
+      box-shadow: 0 3px 1px 0 rgba(0, 0, 0, .05), 0 2px 2px 0 rgba(0, 0, 0, .1), 0 3px 3px 0 rgba(0, 0, 0, .05);
+      @when on {
+        left: 0;
+      }
+
+      @when off {
+        right: 0;
+      }
+
+    }
+
+    @when on {
+      background-color: #44db5e;
+      border-color: #44db5e;
+    }
+
+    @when off {
+      background-color: #fff;
+      border-color: rgba(0, 0, 0, .1);
+    }
+
+    @when loading {
+        /* TODO */
+    }
+
+    @when disabled {
+      background-color: #f2f2f2;
+      border-color: rgba(0, 0, 0, .1);
+    }
+  }
+}

packages/switch/src/switch.vue

@@ -0,0 +1,71 @@
+<template>
+<div class="o2-switch" :class="['is-' + switchState]" @click="toggleState">
+  <div class="o2-switch-node"></div>
+</div>
+</template>
+
+<script>
+/**
+ * o2-switch
+ * @module components/switch
+ * @desc 开关
+ * @param {boolean} [checked=false] - 开关状态
+ * @param {boolean} [disabled=false] - 禁用
+ * @param {boolean} [loading=false] - loading状态
+ * @param {callback} [onChange] - 开关状态改变回调函数。
+ *
+ * @example
+ * <o2-switch checked="true" disabled="false"></o2-switch>
+ */
+export default 
+{
+  name: 'o2-switch',
+  props: {
+    checked: {
+      type: Boolean,
+      default: false
+    },
+    disabled: {
+      type: Boolean,
+      default: false
+    },
+    loading: {
+      type: Boolean,
+      default: false
+    },
+    onChange: {
+      type: Function,
+      default: function() {}
+    }
+  },
+  computed: {
+    switchState: function() {
+      if (this.disabled) {
+          return 'disabled';
+      } else if (this.loading) {
+          return 'loading';
+      } else if (this.checked) {
+          return 'on';
+      } else {
+          return 'off';
+      }
+    }
+  },
+  methods: {
+    /*
+     * 开关状态交互。
+     */
+    toggleState: function() {
+      if(this.disabled || this.loading) return;
+      this.onChange(!this.checked);
+    },
+
+    /*
+     * 
+     */
+    getState: function() {
+      return this.checked;
+    }
+  }
+};
+</script>