feat: add preview theme support (#660)

#### What type of PR is this?

/kind feature
/milestone 2.0

#### What this PR does / why we need it:

Ref https://github.com/halo-dev/halo/pull/2280

支持在 Console 预览主题。

#### Screenshots:

<img width="1920" alt="image" src="https://user-images.githubusercontent.com/21301288/197442483-e89b8c3c-441e-4668-9840-96fe741a1f95.png">


#### Special notes for your reviewer:

测试方式：进入主题管理，打开已安装主题列表，在每一项的更多按钮即可看到预览主题的按钮。

#### Does this PR introduce a user-facing change?

```release-note
支持在 Console 预览主题。
```

src/components/preview/UrlPreviewModal.vue

@@ -0,0 +1,53 @@
+<script lang="ts" setup>
+import { VModal, IconLink } from "@halo-dev/components";
+
+withDefaults(
+  defineProps<{
+    visible: boolean;
+    title?: string;
+    url?: string;
+  }>(),
+  {
+    visible: false,
+    title: undefined,
+    url: "",
+  }
+);
+
+const emit = defineEmits<{
+  (event: "update:visible", visible: boolean): void;
+  (event: "close"): void;
+}>();
+
+const onVisibleChange = (visible: boolean) => {
+  emit("update:visible", visible);
+  if (!visible) {
+    emit("close");
+  }
+};
+</script>
+<template>
+  <VModal
+    :body-class="['!p-0']"
+    :visible="visible"
+    fullscreen
+    :title="title"
+    @update:visible="onVisibleChange"
+  >
+    <template #actions>
+      <slot name="actions"></slot>
+      <span>
+        <a :href="url" target="_blank">
+          <IconLink />
+        </a>
+      </span>
+    </template>
+    <div class="flex h-full items-center justify-center">
+      <iframe
+        v-if="visible"
+        class="h-full w-full border-none transition-all duration-300"
+        :src="url"
+      ></iframe>
+    </div>
+  </VModal>
+</template>

src/modules/interface/themes/components/ThemeListModal.vue

@@ -2,6 +2,8 @@
 import {
   IconAddCircle,
   IconGitHub,
+  IconArrowLeft,
+  IconArrowRight,
   Dialog,
   VButton,
   VEmpty,
@@ -15,6 +17,7 @@ import {
   VTabs,
 } from "@halo-dev/components";
 import LazyImage from "@/components/image/LazyImage.vue";
+import UrlPreviewModal from "@/components/preview/UrlPreviewModal.vue";
 import ThemeUploadModal from "./ThemeUploadModal.vue";
 import { computed, ref, watch } from "vue";
 import type { Theme } from "@halo-dev/api-client";
@@ -57,6 +60,8 @@ const handleFetchThemes = async () => {
   try {
     loading.value = true;
     const { data } = await apiClient.theme.listThemes({
+      page: 0,
+      size: 0,
       uninstalled: activeTab.value !== "installed",
     });
     themes.value = data.items;
@@ -161,6 +166,50 @@ watch(
 defineExpose({
   handleFetchThemes,
 });
+
+const preview = ref(false);
+const selectedPreviewTheme = ref<Theme>();
+
+const previewUrl = computed(() => {
+  if (!selectedPreviewTheme.value) {
+    return "";
+  }
+  return `${import.meta.env.VITE_API_URL}/?preview-theme=${
+    selectedPreviewTheme.value.metadata.name
+  }`;
+});
+
+const previewModalTitle = computed(() => {
+  if (!selectedPreviewTheme.value) {
+    return "";
+  }
+  return `预览主题：${selectedPreviewTheme.value.spec.displayName}`;
+});
+
+const handleOpenPreview = (theme: Theme) => {
+  selectedPreviewTheme.value = theme;
+  preview.value = true;
+};
+
+const handleSelectPreviousPreviewTheme = async () => {
+  const index = themes.value.findIndex(
+    (theme) => theme.metadata.name === selectedPreviewTheme.value?.metadata.name
+  );
+  if (index > 0) {
+    selectedPreviewTheme.value = themes.value[index - 1];
+    return;
+  }
+};
+
+const handleSelectNextPreviewTheme = () => {
+  const index = themes.value.findIndex(
+    (theme) => theme.metadata.name === selectedPreviewTheme.value?.metadata.name
+  );
+  if (index < themes.value.length - 1) {
+    selectedPreviewTheme.value = themes.value[index + 1];
+    return;
+  }
+};
 </script>
 <template>
   <VModal
@@ -299,6 +348,14 @@ defineExpose({
                 v-if="currentUserHasPermission(['system:themes:manage'])"
                 #dropdownItems
               >
+                <VButton
+                  v-close-popper
+                  block
+                  type="secondary"
+                  @click="handleOpenPreview(theme)"
+                >
+                  预览
+                </VButton>
                 <VButton
                   v-close-popper
                   block
@@ -442,4 +499,19 @@ defineExpose({
     v-model:visible="themeInstall"
     @close="handleFetchThemes"
   />
+
+  <UrlPreviewModal
+    v-model:visible="preview"
+    :title="previewModalTitle"
+    :url="previewUrl"
+  >
+    <template #actions>
+      <span @click="handleSelectPreviousPreviewTheme">
+        <IconArrowLeft />
+      </span>
+      <span @click="handleSelectNextPreviewTheme">
+        <IconArrowRight />
+      </span>
+    </template>
+  </UrlPreviewModal>
 </template>