fix component preview styles

src/components/component_preview/component_preview.js

@@ -0,0 +1,80 @@
+import Checkbox from 'src/components/checkbox/checkbox.vue'
+import ColorInput from 'src/components/color_input/color_input.vue'
+
+import genRandomSeed from 'src/services/random_seed/random_seed.service.js'
+
+export default {
+  components: {
+    Checkbox,
+    ColorInput
+  },
+  props: [
+    'shadow',
+    'shadowControl',
+    'previewClass',
+    'previewStyle',
+    'previewCss',
+    'disabled',
+    'invalid',
+    'noColorControl'
+  ],
+  emits: ['update:shadow'],
+  data () {
+    return {
+      colorOverride: undefined,
+      lightGrid: false,
+      zoom: 100,
+      randomSeed: genRandomSeed()
+    }
+  },
+  computed: {
+    hideControls () {
+      return typeof this.shadow === 'string'
+    }
+  },
+  watch: {
+    previewCss () {
+      this.update()
+    },
+    previewStyle () {
+      this.update()
+    },
+    zoom () {
+      this.update()
+    }
+  },
+  methods: {
+    updateProperty (axis, value) {
+      this.$emit('update:shadow', { axis, value: Number(value) })
+    },
+    update () {
+      const styleEl = document.getElementById('component-style-holder')
+      const styleSheet = styleEl.sheet
+
+      for (let i = styleEl.sheet.cssRules.length - 1; i >= 0; --i) {
+        styleEl.sheet.deleteRule(i)
+      }
+
+      const result = []
+
+      if (this.colorOverride) result.push(`--background: ${this.colorOverride}`)
+
+      const styleRule = [
+        '#component-preview-', this.randomSeed, ' {\n',
+        '.preview-block {\n',
+        `zoom: ${this.zoom / 100};`,
+        this.previewStyle,
+        '\n}',
+        '\n}'
+      ].join('')
+
+      styleSheet.insertRule(styleRule)
+      styleSheet.insertRule([
+        '#component-preview-', this.randomSeed, ' {\n',
+        this.previewCss,
+        ...result,
+        '\n}'
+      ].join(''), 'index-max')
+    }
+  }
+}