From 9dc0c8e5cc020471cf0bffa455069873ebff0dd9 Mon Sep 17 00:00:00 2001
From: Oleg <64714442+aluarius@users.noreply.github.com>
Date: Tue, 31 Jan 2023 01:01:12 +0700
Subject: [PATCH] [#2871] fallback component integration for va-image (#2874)

---
 packages/docs/src/locales/en/en.json          |  2 +-
 packages/docs/src/locales/ru/ru.json          |  2 +-
 .../ui-elements/image/examples/Slots.vue      | 40 +++++++++++--------
 .../src/components/va-fallback/VaFallback.vue |  4 --
 .../src/components/va-image/VaImage.demo.vue  |  8 +++-
 .../ui/src/components/va-image/VaImage.vue    | 31 +++++++++++---
 6 files changed, 58 insertions(+), 29 deletions(-)

diff --git a/packages/docs/src/locales/en/en.json b/packages/docs/src/locales/en/en.json
index 6a31599749..633660584b 100644
--- a/packages/docs/src/locales/en/en.json
+++ b/packages/docs/src/locales/en/en.json
@@ -2653,7 +2653,7 @@
       },
       "slots": {
         "title": "Status slots",
-        "text": "We're providing 3 status slots: `error` (visible when `src` path is incorrect), `loading` (visible when image is loading) and `placeholder` (works as both previous)."
+        "text": "We're providing 3 status slots: `error` (visible when `src` path is incorrect), `loading` (visible when image is loading) and `placeholder` (works as both previous). As an alternative for error handling, we provide the `fallback-icon`, `fallback-text`, `fallback-image` and `fallback-renderer` props, that will be called if error slot wasn't passed. Also you're able to set global fallback settings via [components config](/getting-started/configuration-guide#components-config)."
       },
       "srcSet": {
         "title": "Srcset",
diff --git a/packages/docs/src/locales/ru/ru.json b/packages/docs/src/locales/ru/ru.json
index d769ffcaa7..907d495542 100644
--- a/packages/docs/src/locales/ru/ru.json
+++ b/packages/docs/src/locales/ru/ru.json
@@ -2527,7 +2527,7 @@
       },
       "slots": {
         "title": "Слоты состояний",
-        "text": "Мы предоставляем 3 слота состояния: `error` (содержимое отображается когда `src` некорректен), `loading` (содержимое отображается когда изображение грузится) and `placeholder` (универсальное решение, заменяющее 2 предыдущих)."
+        "text": "Мы предоставляем 3 слота состояния: `error` (содержимое отображается когда `src` некорректен), `loading` (содержимое отображается когда изображение грузится) and `placeholder` (универсальное решение, заменяющее 2 предыдущих). Также, в качестве альтернативного способа обработки ошибок, вы можете передавать свойства `fallback-icon`, `fallback-text`, `fallback-image` и `fallback-renderer`, которые будут отрабатывать, если `error` слот не был передан. Кроме того, вы можете установить глобальный настройки фолбэка с помощью [components config](/getting-started/configuration-guide#components-config)."
       },
       "srcSet": {
         "title": "Srcset",
diff --git a/packages/docs/src/page-configs/ui-elements/image/examples/Slots.vue b/packages/docs/src/page-configs/ui-elements/image/examples/Slots.vue
index 85aae50246..3b6c34b8d3 100644
--- a/packages/docs/src/page-configs/ui-elements/image/examples/Slots.vue
+++ b/packages/docs/src/page-configs/ui-elements/image/examples/Slots.vue
@@ -8,22 +8,30 @@
       Wrong path
     </va-button>
   </div>
-  <va-image
-    class="flex flex-col md6 lg4"
-    :src="slotImagePath"
-    @loaded="consoleLog"
-    @error="consoleLog"
-  >
-    <template #loader>
-      <va-progress-circle indeterminate />
-    </template>
-
-    <template #error>
-      <div class="p-8 flex items-center justify-center bg-red-300 rounded-3xl">
-        <va-icon name="close" color="danger" :size="32" />
-      </div>
-    </template>
-  </va-image>
+  <div class="row space-x-4">
+    <va-image
+      class="flex flex-col md6 lg4"
+      :src="slotImagePath"
+      @loaded="consoleLog"
+      @error="consoleLog"
+    >
+      <template #loader>
+        <va-progress-circle indeterminate />
+      </template>
+
+      <template #error>
+        <div class="p-8 flex items-center justify-center bg-red-300 rounded-3xl">
+          <va-icon name="close" color="danger" :size="32" />
+        </div>
+      </template>
+    </va-image>
+
+    <va-image
+      class="flex flex-col md6 lg4"
+      :src="slotImagePath"
+      fallback-text="Fallback will work if error slot wasn't passed"
+    />
+  </div>
 </template>
 
 <script setup>
diff --git a/packages/ui/src/components/va-fallback/VaFallback.vue b/packages/ui/src/components/va-fallback/VaFallback.vue
index cac47218f1..d0e526123c 100644
--- a/packages/ui/src/components/va-fallback/VaFallback.vue
+++ b/packages/ui/src/components/va-fallback/VaFallback.vue
@@ -9,19 +9,15 @@ export default defineComponent({
   props: {
     fallbackSrc: {
       type: String,
-      default: '',
     },
     fallbackText: {
       type: String,
-      default: '',
     },
     fallbackIcon: {
       type: String,
-      default: '',
     },
     fallbackRender: {
       type: Function as PropType<() => any | undefined>,
-      default: undefined,
     },
   },
 
diff --git a/packages/ui/src/components/va-image/VaImage.demo.vue b/packages/ui/src/components/va-image/VaImage.demo.vue
index ce36cd9ace..bd5545f8e4 100644
--- a/packages/ui/src/components/va-image/VaImage.demo.vue
+++ b/packages/ui/src/components/va-image/VaImage.demo.vue
@@ -40,13 +40,19 @@
       </va-image>
 
       <va-image
-        class="image"
+        class="image mb-2"
         :src="slotImagePath"
       >
         <template #placeholder>
           Placeholder (both error and loading states)
         </template>
       </va-image>
+
+      <va-image
+        class="image"
+        :src="slotImagePath"
+        fallback-text="Fallback text"
+      />
     </VbCard>
 
     <VbCard title="Default slot">
diff --git a/packages/ui/src/components/va-image/VaImage.vue b/packages/ui/src/components/va-image/VaImage.vue
index dad4bb0acf..883c5ad5c0 100644
--- a/packages/ui/src/components/va-image/VaImage.vue
+++ b/packages/ui/src/components/va-image/VaImage.vue
@@ -28,10 +28,12 @@
     </div>
 
     <div
-      v-if="isError && $slots.error"
+      v-if="isError && ($slots.error || isAnyFallbackPassed)"
       class="va-image__error"
     >
-      <slot name="error" />
+      <slot name="error">
+        <va-fallback v-bind="fallbackProps" @fallback="$emit('fallback')" />
+      </slot>
     </div>
 
     <div
@@ -69,6 +71,7 @@ import {
 } from 'vue'
 
 import { VaAspectRatio } from '../va-aspect-ratio'
+import { VaFallback } from '../va-fallback'
 
 import { useNativeImgAttributes, useNativeImgAttributesProps } from './hooks/useNativeImgAttributes'
 import {
@@ -76,18 +79,24 @@ import {
   useIsMounted,
   useDeprecated,
   useIntersectionObserver,
+  useGlobalConfig,
 } from '../../composables'
 
+import { extractComponentProps, filterComponentProps } from '../../utils/component-options'
+
+const VaFallbackProps = extractComponentProps(VaFallback)
+
 export default defineComponent({
   name: 'VaImage',
 
-  components: { VaAspectRatio },
+  components: { VaAspectRatio, VaFallback },
 
-  emits: ['loaded', 'error'],
+  emits: ['loaded', 'error', 'fallback'],
 
   props: {
     ...useComponentPresetProp,
     ...useNativeImgAttributesProps,
+    ...VaFallbackProps,
     ratio: {
       type: [Number, String] as PropType<number | 'auto'>,
       default: 'auto',
@@ -201,8 +210,10 @@ export default defineComponent({
     onBeforeUnmount(() => clearTimeout(timer))
     watch(() => props.src, init)
 
-    const isPlaceholderShown = computed(() =>
-      ((isLoading.value && !slots?.loader?.()) || (isError.value && !slots?.error?.())) && (slots?.placeholder?.() || props.placeholderSrc))
+    const isPlaceholderPassed = computed(() => slots?.placeholder?.() || props.placeholderSrc)
+    const isLoaderShown = computed(() => isLoading.value && !slots?.loader?.())
+    const isErrorShown = computed(() => isError.value && (!slots?.error?.() && !isAnyFallbackPassed.value))
+    const isPlaceholderShown = computed(() => (isLoaderShown.value || isErrorShown.value) && isPlaceholderPassed.value)
 
     const isSuccessfullyLoaded = computed(() => !(isLoading.value || isError.value))
 
@@ -214,6 +225,11 @@ export default defineComponent({
       ratio: props.ratio,
     }))
 
+    const fallbackProps = filterComponentProps(VaFallbackProps)
+    const checkObjectNonEmptyValues = (obj: Record<string, any> | undefined) => !!Object.values(obj || {}).filter((prop) => prop).length
+    const hasFallbackGlobalConfig = computed(() => checkObjectNonEmptyValues(useGlobalConfig()?.globalConfig?.value?.components?.VaFallback))
+    const isAnyFallbackPassed = computed(() => checkObjectNonEmptyValues(fallbackProps.value) || hasFallbackGlobalConfig.value)
+
     // TODO: refactor (just v-bind fit prop to CSS) in 1.7.0
     const fitComputed = computed(() => {
       if (props.contain) { return 'contain' }
@@ -236,6 +252,9 @@ export default defineComponent({
       isSuccessfullyLoaded,
       imgAttributesComputed,
       aspectRationAttributesComputed,
+
+      isAnyFallbackPassed,
+      fallbackProps,
     }
   },
 })