From 395617f2d3dac74d01049b087928443febb12d71 Mon Sep 17 00:00:00 2001
From: CKY <caikaiyi@zj.tech>
Date: Fri, 30 Sep 2022 17:28:09 +0800
Subject: [PATCH] feat: upgrade tags view

---
 src/layout/components/TagsView/ScrollPane.vue | 83 +++++++++++++++++--
 src/layout/components/TagsView/index.vue      |  4 +-
 2 files changed, 79 insertions(+), 8 deletions(-)

diff --git a/src/layout/components/TagsView/ScrollPane.vue b/src/layout/components/TagsView/ScrollPane.vue
index eec31e45..076762d8 100644
--- a/src/layout/components/TagsView/ScrollPane.vue
+++ b/src/layout/components/TagsView/ScrollPane.vue
@@ -1,15 +1,86 @@
+<script lang="ts" setup>
+import { ref } from "vue"
+import { ElScrollbar } from "element-plus"
+import { ArrowLeftBold, ArrowRightBold } from "@element-plus/icons-vue"
+const scrollContainerRef = ref<HTMLDivElement>()
+const scrollbarBoxRef = ref<HTMLDivElement>()
+const scrollbarRef = ref<InstanceType<typeof ElScrollbar>>()
+
+// current scrolled distance
+let currentScrollLeft = 0
+// the distance of each manual trigger scroll
+const translatePerDistance = 200
+const toleranceDistance = 40
+
+// scroll trigger
+const scrollChange = ({ scrollLeft = 0 }) => {
+  currentScrollLeft = scrollLeft
+}
+
+// click to scroll
+const scrollTo = (type: string) => {
+  // container width
+  const scrollContainerWidth = scrollContainerRef.value!.clientWidth
+  // content width
+  const scrollbarBoxWidth = scrollbarBoxRef.value!.clientWidth
+  // If no scroll bar appears, return directly
+  if (scrollContainerWidth > scrollbarBoxWidth) return
+  let translateDistance = 0
+  if (type === "prev") {
+    translateDistance =
+      currentScrollLeft > translatePerDistance + toleranceDistance ? currentScrollLeft - translatePerDistance : 0
+  } else if (type === "next") {
+    // remaining unscrolled width on the right
+    const lastDistance = scrollbarBoxWidth - currentScrollLeft - scrollContainerWidth
+    translateDistance =
+      lastDistance > translatePerDistance + toleranceDistance
+        ? currentScrollLeft + translatePerDistance
+        : currentScrollLeft + lastDistance
+  }
+  scrollbarRef.value!.setScrollLeft(translateDistance)
+}
+</script>
+
 <template>
-  <el-scrollbar :vertical="false" class="scroll-container">
-    <slot />
-  </el-scrollbar>
+  <div ref="scrollContainerRef" class="scroll-container">
+    <el-button class="scroll-indicator prev" :icon="ArrowLeftBold" @click="scrollTo('prev')" />
+    <el-scrollbar ref="scrollbarRef" :vertical="false" class="scroll-bar" @scroll="scrollChange">
+      <div ref="scrollbarBoxRef" class="scroll-bar_box">
+        <slot />
+      </div>
+    </el-scrollbar>
+    <el-button class="scroll-indicator next" :icon="ArrowRightBold" @click="scrollTo('next')" />
+  </div>
 </template>
 
 <style lang="scss" scoped>
 .scroll-container {
-  // 超出窗口长度时，显示滚动条
-  white-space: nowrap;
   position: relative;
-  overflow: hidden;
   width: 100%;
+  .scroll-indicator {
+    position: absolute;
+    top: 0;
+    z-index: 1;
+    padding: 2px;
+    &.prev {
+      left: 0;
+    }
+    &.next {
+      right: 0;
+    }
+  }
+  .scroll-bar {
+    // 超出窗口长度时，显示滚动条
+    white-space: nowrap;
+    position: relative;
+    overflow: hidden;
+    width: 100%;
+    :deep(.el-scrollbar__wrap) {
+      scroll-behavior: smooth;
+    }
+    .scroll-bar_box {
+      display: inline-block;
+    }
+  }
 }
 </style>
diff --git a/src/layout/components/TagsView/index.vue b/src/layout/components/TagsView/index.vue
index 11b04361..392c0c21 100644
--- a/src/layout/components/TagsView/index.vue
+++ b/src/layout/components/TagsView/index.vue
@@ -205,10 +205,10 @@ onMounted(() => {
       margin-left: 5px;
       margin-top: 4px;
       &:first-of-type {
-        margin-left: 15px;
+        margin-left: 24px;
       }
       &:last-of-type {
-        margin-right: 15px;
+        margin-right: 24px;
       }
       &.active {
         background-color: var(--v3-tagsview-tag-active-bg-color);