[improvement] extract checkbox mixin (#2653)

packages/mixins/checkbox.js

@@ -0,0 +1,76 @@
+/**
+ * Common part of Checkbox & Radio
+ */
+import Icon from '../icon';
+import findParent from './find-parent';
+
+export default ({ parent, bem }) => ({
+  mixins: [findParent],
+
+  props: {
+    name: null,
+    value: null,
+    disabled: Boolean,
+    checkedColor: String,
+    labelPosition: String,
+    labelDisabled: Boolean,
+    shape: {
+      type: String,
+      default: 'round'
+    }
+  },
+
+  created() {
+    this.findParent(parent);
+  },
+
+  computed: {
+    isDisabled() {
+      return (this.parent && this.parent.disabled) || this.disabled;
+    },
+
+    iconStyle() {
+      const { checkedColor } = this;
+      if (checkedColor && this.checked && !this.isDisabled) {
+        return {
+          borderColor: checkedColor,
+          backgroundColor: checkedColor
+        };
+      }
+    }
+  },
+
+  render(h) {
+    const CheckIcon = this.$scopedSlots.icon ? (
+      this.$scopedSlots.icon({ checked: this.checked })
+    ) : (
+      <Icon name="success" style={this.iconStyle} />
+    );
+
+    const Label = this.$slots.default && (
+      <span
+        class={bem('label', [this.labelPosition, { disabled: this.isDisabled }])}
+        onClick={this.onClickLabel}
+      >
+        {this.$slots.default}
+      </span>
+    );
+
+    return (
+      <div
+        class={bem()}
+        onClick={() => {
+          this.$emit('click');
+        }}
+      >
+        <div
+          class={bem('icon', [this.shape, { disabled: this.isDisabled, checked: this.checked }])}
+          onClick={this.onClickIcon}
+        >
+          {CheckIcon}
+        </div>
+        {Label}
+      </div>
+    );
+  }
+});