From ad9e63035809ce65054df80bde95572b993de415 Mon Sep 17 00:00:00 2001
From: Jake Mannens <jake@asger.xyz>
Date: Wed, 6 Sep 2023 12:22:27 +1000
Subject: Added DialogService to manage dialog z-indexes

---
 Pages/Component/Dialog.razor | 39 +++++++++++++++++++++++++++++++++++----
 Program.cs                   |  1 +
 Services/DialogService.cs    | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 75 insertions(+), 4 deletions(-)
 create mode 100644 Services/DialogService.cs

diff --git a/Pages/Component/Dialog.razor b/Pages/Component/Dialog.razor
index f479368..e71ddc6 100644
--- a/Pages/Component/Dialog.razor
+++ b/Pages/Component/Dialog.razor
@@ -1,6 +1,8 @@
-@implements IDialog
+@inject IDialogService dialogService
+@implements IDialog
+@implements IDisposable
 
-<div style="@(heightStyle + visiblilityStyle)">
+<div @onclick=Bump style="@(style)">
     @if(Title is not null) {
         <p>@Title</p>
         <hr/>
@@ -24,20 +26,49 @@
         get => visible;
         set {
             visible = value;
+            if(value)
+                Bump();
             StateHasChanged();
         }
     }
 
-    public void Show() => Visible = true;
-    public void Hide() => Visible = false;
+    public int? ZIndex {
+        get => zIndex;
+        set {
+            zIndex = value;
+            StateHasChanged();
+        }
+    }
 
     private bool visible = false;
 
+    private int? zIndex;
+
     private string? height;
 
+    protected override void OnInitialized() =>
+       dialogService.Register(this);
+
+    public void Show() => Visible = true;
+    public void Hide() => Visible = false;
+
+    private void Bump() =>
+        dialogService.BumpZIndex(this);
+
+    private string style =>
+        zIndexStyle +
+        heightStyle +
+        visiblilityStyle;
+
+    private string zIndexStyle =>
+        zIndex is null ? "display:none;" : $"z-index:{zIndex};";
+
     private string heightStyle =>
         $"{(height is null ? "" : $"max-height:{height};")}";
 
     private string visiblilityStyle =>
         Visible ? "opacity:1;visibility:visible;" : "opacity:0;visibility:hidden;";
+
+    public void Dispose() =>
+        dialogService.Unregister(this);
 }
diff --git a/Program.cs b/Program.cs
index 564ab30..494a808 100644
--- a/Program.cs
+++ b/Program.cs
@@ -21,6 +21,7 @@ public class Program {
         builder.Services.AddScoped<ITagService, TagService>();
         builder.Services.AddScoped<IMediaService, MediaService>();
         builder.Services.AddSingleton<IUserService, UserService>();
+        builder.Services.AddScoped<IDialogService, DialogService>();
         builder.Services.AddHostedService<OcrService>();
 
         var app = builder.Build();
diff --git a/Services/DialogService.cs b/Services/DialogService.cs
new file mode 100644
index 0000000..5967d95
--- /dev/null
+++ b/Services/DialogService.cs
@@ -0,0 +1,39 @@
+using HyperBooru.Pages.Component;
+
+namespace HyperBooru.Services;
+
+public interface IDialogService {
+    public void Register(Dialog dialog);
+    public void Unregister(Dialog dialog);
+    public void BumpZIndex(Dialog dialog);
+}
+
+public class DialogService : IDialogService {
+    private const int MinZLevel = 900;
+
+    private List<Dialog> dialogs = new();
+
+    public void Register(Dialog dialog) {
+        if(!dialogs.Contains(dialog))
+            dialogs.Add(dialog);
+
+        dialog.ZIndex = dialogs.Count() - 1 + MinZLevel;
+    }
+
+    public void Unregister(Dialog dialog) {
+        dialogs.Remove(dialog);
+        for(int i = 0; i < dialogs.Count(); i++)
+            dialogs[i].ZIndex = i + MinZLevel;
+    }
+
+    public void BumpZIndex(Dialog dialog) {
+        if(!dialogs.Contains(dialog))
+            return;
+
+        dialogs.Remove(dialog);
+        dialogs.Add(dialog);
+
+        for(int i = 0; i < dialogs.Count(); i++)
+            dialogs[i].ZIndex = i + MinZLevel;
+    }
+}
\ No newline at end of file
-- 
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