feat: scroll to top button

apps/NwaifuWeb/src/app/app.component.ts

@@ -1,5 +1,5 @@
 import { Component } from "@angular/core";
-import { RouterModule } from '@angular/router';
+import { RouterModule } from "@angular/router";
 import { PanelComponent } from "./modules/panel/panel.component";
 
 @Component({

apps/NwaifuWeb/src/app/pages/nitroplus-translator/components/text_list/text_list.component.scss

@@ -6,7 +6,7 @@
   margin-inline: 2rem;
 }
 
-h1 {
+h1, h2 {
   color: #efdee0;
   text-align: center;
   margin: 1rem 2rem;

apps/NwaifuWeb/src/app/pages/nitroplus-translator/nitroplus-translator.component.html

@@ -28,3 +28,6 @@
   <button id="close_win" (click)="onCloseClicked()"><i class="lni lni-close"></i></button>
 </div>
 <app-text-list [elements]="elements"></app-text-list>
+<nwui-button class="to-top-btn" (click)="scrollToTop()"
+  ><i class="lni lni-arrow-up"></i
+></nwui-button>

apps/NwaifuWeb/src/app/pages/nitroplus-translator/nitroplus-translator.component.less

@@ -45,3 +45,14 @@
   min-height: calc(100vh - 2rem);
   scrollbar-color: #413738;
 }
+.to-top-btn {
+  position: fixed;
+  width: 2rem;
+  left: 2rem;
+  bottom: -5rem;
+  transition: bottom 0.3s ease-in-out;
+
+  &.active {
+    bottom: 1rem;
+  }
+}

apps/NwaifuWeb/src/app/pages/nitroplus-translator/nitroplus-translator.component.ts

@@ -1,7 +1,8 @@
 import { CommonModule } from "@angular/common";
-import { Component, OnInit, ViewChild } from "@angular/core";
+import { AfterViewInit, Component, OnInit, ViewChild } from "@angular/core";
 import { Router } from "@angular/router";
 import { NWUIButtonComponent } from "@nwaifu-ui";
+import { fromEvent, map } from "rxjs";
 import { TextListComponent } from "./components/text_list/text_list.component";
 import { LocalStorageKeys } from "./consts";
 import { NpsFile, TranslateData } from "./dto/translate_data.dto";
@@ -14,7 +15,7 @@ import { parse } from "./lib/parser";
   templateUrl: "./nitroplus-translator.component.html",
   styleUrl: "./nitroplus-translator.component.less",
 })
-export class NitroplusComponent implements OnInit {
+export class NitroplusComponent implements OnInit, AfterViewInit {
   title = "NitroPlusTranslator";
   elements: TranslateData[] = [];
   @ViewChild("fileInput") fileInput: HTMLInputElement | null = null;
@@ -36,6 +37,25 @@ export class NitroplusComponent implements OnInit {
     }
   }
 
+  ngAfterViewInit(): void {
+    const container = document.querySelector("main");
+    if (container) {
+      fromEvent(container, "scroll")
+        .pipe(map(() => container.scrollTop > 100))
+        .subscribe((val) => {
+          if (val) document.querySelector(".to-top-btn")?.classList.add("active");
+          else document.querySelector(".to-top-btn")?.classList.remove("active");
+        });
+    }
+  }
+
+  scrollToTop() {
+    const container = document.querySelector("main");
+    if (container) {
+      container.scrollTo({ top: 0, behavior: "smooth" });
+    }
+  }
+
   submitFile($event: Event) {
     const target = $event.target as HTMLInputElement;
     if (target.files) {