refactor: reorganize all components (#8303)

src/checkbox/Checkbox.tsx

@@ -0,0 +1,99 @@
+import { computed, watch, defineComponent } from 'vue';
+
+// Utils
+import { createNamespace, pick } from '../utils';
+import {
+  CHECKBOX_GROUP_KEY,
+  CheckboxGroupProvide,
+} from '../checkbox-group/CheckboxGroup';
+
+// Composables
+import { useParent } from '@vant/use';
+import { useExpose } from '../composables/use-expose';
+import { useLinkField } from '../composables/use-link-field';
+
+// Components
+import Checker, { checkerProps } from './Checker';
+
+const [name, bem] = createNamespace('checkbox');
+
+export default defineComponent({
+  name,
+
+  props: {
+    ...checkerProps,
+    bindGroup: {
+      type: Boolean,
+      default: true,
+    },
+  },
+
+  emits: ['change', 'update:modelValue'],
+
+  setup(props, { emit, slots }) {
+    const { parent } = useParent<CheckboxGroupProvide>(CHECKBOX_GROUP_KEY);
+
+    const setParentValue = (checked: boolean) => {
+      const { name } = props;
+      const { max, modelValue } = parent!.props;
+      const value = modelValue.slice();
+
+      if (checked) {
+        const overlimit = max && value.length >= max;
+
+        if (!overlimit && !value.includes(name)) {
+          value.push(name);
+
+          if (props.bindGroup) {
+            parent!.updateValue(value);
+          }
+        }
+      } else {
+        const index = value.indexOf(name);
+
+        if (index !== -1) {
+          value.splice(index, 1);
+
+          if (props.bindGroup) {
+            parent!.updateValue(value);
+          }
+        }
+      }
+    };
+
+    const checked = computed(() => {
+      if (parent && props.bindGroup) {
+        return parent.props.modelValue.indexOf(props.name) !== -1;
+      }
+      return !!props.modelValue;
+    });
+
+    const toggle = (newValue = !checked.value) => {
+      if (parent && props.bindGroup) {
+        setParentValue(newValue);
+      } else {
+        emit('update:modelValue', newValue);
+      }
+    };
+
+    watch(
+      () => props.modelValue,
+      (value) => emit('change', value)
+    );
+
+    useExpose({ toggle, props, checked });
+    useLinkField(() => props.modelValue);
+
+    return () => (
+      <Checker
+        v-slots={pick(slots, ['default', 'icon'])}
+        bem={bem}
+        role="checkbox"
+        parent={parent}
+        checked={checked.value}
+        onToggle={toggle}
+        {...props}
+      />
+    );
+  },
+});