[frontend] Interactive scroller for note attachments!

Iceshrimp.Frontend/Components/AttachmentView.razor

@@ -0,0 +1,91 @@
+@using Iceshrimp.Shared.Schemas
+@using Iceshrimp.Assets.PhosphorIcons
+@inject IJSRuntime Js
+
+<dialog class="attachment-view" @ref="Dialog">
+    <button @onclick="CloseDialog" class="close"><Icon Name="Icons.X" Size="5rem"></Icon></button>
+    @if (Focused < _refs.Count -1 )
+    {
+        <button @onclick="Next" class="next"><Icon Name="Icons.ArrowRight" Size="5rem"></Icon></button>
+    }
+    @if (Focused > 0)
+    {
+        <button @onclick="Prev" class="prev"><Icon Name="Icons.ArrowLeft" Size="5rem"></Icon></button>
+    }
+    <div class="wrap" @ref="Scroller" @onscroll="Scroll">
+        @foreach (var element in Attachments)
+        {
+            <div class="container" @ref="@Ref">
+                <img class="attachment" src="@element.Url" alt="@element.AltText"/>
+            </div>
+        }
+    </div>
+</dialog>
+
+@code {
+    [Parameter][EditorRequired] public IList<NoteAttachment>  Attachments { get; set; }
+    private                            ElementReference       Dialog      { get; set; }
+    private                            IJSObjectReference?    Module      { get; set; }
+    private                            int                    Focused     { get; set; }
+    private                            List<ElementReference> _refs = [];
+    public                             ElementReference       Ref         { set => _refs.Add(value); }
+    private                            ElementReference       Scroller    { get; set; }
+    private                            int                    ScrollWidth { get; set; }
+    private                            int                    ScrollLeft  { get; set; }
+
+    protected override void OnParametersSet()
+    {
+        Focused = 0;
+    }
+    
+    private async Task Scroll()
+    {
+        // This should probably be moved to floating point.
+        // So the state transition happens sooner, i.e. at 2.5 vs 3?
+        ScrollLeft = await Module.InvokeAsync<int>("getScrollLeft", Scroller);
+        var fraction = ScrollWidth / _refs.Count;
+        var section  = ScrollLeft / fraction;
+        Focused = section;
+    }
+
+    private async Task Next()
+    {
+        if (Focused >= _refs.Count)
+        {
+            return;
+        }
+        Focused += 1;
+        await Module.InvokeVoidAsync("scrollTo", _refs[Focused]);
+    }
+
+    private async Task Prev()
+    {
+        if (Focused <= 0)
+        {
+            return;
+        }
+        Focused -= 1;
+        await Module.InvokeVoidAsync("scrollTo", _refs[Focused]);
+
+    }
+
+    public async Task OpenDialog()
+    {
+        await Module.InvokeVoidAsync("openDialog", Dialog);
+        ScrollWidth = await Module.InvokeAsync<int>("getScrollWidth", Scroller);
+    }
+
+    private async Task CloseDialog()
+    {
+        await Module.InvokeVoidAsync("closeDialog", Dialog);
+    }
+    
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        if (firstRender)
+        {
+            Module = await Js.InvokeAsync<IJSObjectReference>("import",
+                                                               "./Components/AttachmentView.razor.js");
+        }
+    }
+}

Iceshrimp.Frontend/Components/AttachmentView.razor.css

@@ -0,0 +1,60 @@
+.attachment-view {
+    background-color: transparent;
+    max-height: 100vh;
+    max-width: 100vw;
+}
+
+.container {
+    display: flex;
+    flex: 0 0 auto;
+    width: 100%;
+    height: 100%;
+    scroll-snap-align: center;
+    justify-content: center;
+    align-content: center;
+    background-color: transparent;
+}
+.attachment {
+    max-width: 85%;
+    max-height: 85%;
+    object-fit: contain;
+    margin: auto;
+}
+.wrap {
+    background-color: transparent;
+    scroll-snap-type: x mandatory;
+    width: 100vw;
+    height: 100vh;
+    display: flex;
+    overflow: scroll;
+    flex-wrap: nowrap;
+}
+
+::backdrop{
+    opacity: 50%;
+    background-color: black;
+}
+
+.close{
+    position: absolute;
+    top: 0%;
+    right: 0%;
+    background-color: transparent;
+    color: white;
+}
+
+.next {
+    position: absolute;
+    top: 50%;
+    right: 0%;
+    background-color: transparent;
+    color: white;
+}
+
+.prev {
+    position: absolute;
+    top: 50%;
+    left: 0%;
+    background-color: transparent;
+    color: white;
+}

Iceshrimp.Frontend/Components/AttachmentView.razor.js

@@ -0,0 +1,18 @@
+export function openDialog(element){
+    element.showModal()
+}
+export function closeDialog(element){
+    element.close()
+}
+
+export function scrollTo(element) {
+    element.scrollIntoView()
+}
+
+export function getScrollLeft(element){
+    return element.scrollLeft
+}
+
+export function getScrollWidth(element){
+    return element.scrollWidth
+}

Iceshrimp.Frontend/Components/NoteAttachments.razor

@@ -0,0 +1,20 @@
+@using Iceshrimp.Shared.Schemas
+
+<div class="attachment-container">
+    @foreach (var element in Attachments)
+    {
+        <div class="wrapper" @onclick="Open">
+            <img class="attachment" src="@element.Url" alt="@element.AltText"/>
+        </div>
+    }
+    <AttachmentView @ref="View" Attachments="Attachments"></AttachmentView>
+</div>
+@code {
+    [Parameter] [EditorRequired] public IList<NoteAttachment> Attachments    { get; set; }
+    private                             AttachmentView        View { get; set; }
+
+    private void Open()
+    {
+        View.OpenDialog();
+    }
+}

Iceshrimp.Frontend/Components/NoteAttachments.razor.css

@@ -0,0 +1,16 @@
+.attachment {
+    max-width: 100%;
+    object-fit: contain;
+    max-height: 25rem;
+    border-radius: 0.5rem;
+}
+.wrapper {
+    flex: 1 1 48%;
+    margin-right: 0.2em;
+    margin-left: 0.2em;
+    text-align: center;
+}
+.attachment-container {
+    display: flex;
+    flex-wrap: wrap;
+}

Iceshrimp.Frontend/Components/NoteAttachments.razor.js

@@ -0,0 +1,5 @@
+export class NoteAttachments {
+  
+}
+
+window.NoteAttachments = NoteAttachments;

Iceshrimp.Frontend/Components/NoteBody.razor

@@ -1,4 +1,3 @@
-@using Iceshrimp.Frontend.Pages
 @using Iceshrimp.Shared.Schemas
 
 @if (NoteBase.Cw != null)
@@ -33,12 +32,10 @@
 }
 @if (NoteBase.Attachments.Count > 0)
 {
-    foreach (var element in NoteBase.Attachments)
+    <NoteAttachments Attachments="NoteBase.Attachments"/>
-    {
-        <img class="attachment" src="@element.Url"/>
-    }
 }
 
+
 @code {
     [Parameter] public required NoteBase NoteBase   { get; set; }
     [Parameter] public required bool     OverLength { get; set; }

Iceshrimp.Frontend/Components/NoteBody.razor.css

@@ -24,6 +24,3 @@
 .hidden {
     display: none;
 }
-.attachment {
-    max-width: 100%;
-}

Iceshrimp.Frontend/wwwroot/css/app.css

@@ -68,6 +68,8 @@ menu {
 
 dialog {
     border: 0;
+    margin: 0;
+    padding: 0;
 }
 
 button {