bitfoundation · msynk · Jun 13, 2026 · Jun 13, 2026 · Jun 14, 2026 · Jun 14, 2026
diff --git a/src/Bmotion/Bit.Bmotion.Demos/App.razor b/src/Bmotion/Bit.Bmotion.Demos/App.razor
@@ -0,0 +1,12 @@
+<Router AppAssembly="@typeof(App).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <PageTitle>Not found</PageTitle>
+        <LayoutView Layout="@typeof(MainLayout)">
+            <p role="alert">Sorry, there's nothing at this address.</p>
+        </LayoutView>
+    </NotFound>
+</Router>
diff --git a/src/Bmotion/Bit.Bmotion.Demos/Bit.Bmotion.Demos.csproj b/src/Bmotion/Bit.Bmotion.Demos/Bit.Bmotion.Demos.csproj
@@ -0,0 +1,26 @@
+<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <NoDefaultLaunchSettingsFile>true</NoDefaultLaunchSettingsFile>
+    <!--
+      Disable static web asset fingerprinting for this dev/sample app so the running
+      dev server and the browser's cached boot manifest can't drift and trigger SRI
+      integrity 404s on fingerprinted _framework assets.
+    -->
+    <WasmFingerprintAssets>false</WasmFingerprintAssets>
+    <StaticWebAssetFingerprintingEnabled>false</StaticWebAssetFingerprintingEnabled>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="10.0.8" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="10.0.8" PrivateAssets="all" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Bit.Bmotion\Bit.Bmotion.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/src/Bmotion/Bit.Bmotion.Demos/Layout/MainLayout.razor b/src/Bmotion/Bit.Bmotion.Demos/Layout/MainLayout.razor
@@ -0,0 +1,19 @@
+@inherits LayoutComponentBase
+
+<div class="bm-nav">
+    <span class="logo">Bmotion</span>
+    <NavLink href="" Match="NavLinkMatch.All">Home</NavLink>
+    <NavLink href="basic">Basics</NavLink>
+    <NavLink href="springs">Springs</NavLink>
+    <NavLink href="gestures">Gestures</NavLink>
+    <NavLink href="variants">Variants</NavLink>
+    <NavLink href="keyframes">Keyframes</NavLink>
+    <NavLink href="presence">AnimatePresence</NavLink>
+    <NavLink href="drag">Drag</NavLink>
+    <NavLink href="scroll">Scroll</NavLink>
+    <NavLink href="layout">Layout</NavLink>
+</div>
+
+<div class="bm-page">
+    @Body
+</div>
diff --git a/src/Bmotion/Bit.Bmotion.Demos/Pages/AnimatePresencePage.razor b/src/Bmotion/Bit.Bmotion.Demos/Pages/AnimatePresencePage.razor
@@ -0,0 +1,207 @@
+@page "/presence"
+
+<div class="demo-section">
+    <h2>AnimatePresence</h2>
+    <p>
+        Wrap conditional content in <strong>AnimatePresence</strong>. When
+        <c>IsPresent</c> becomes <c>false</c> the children play their <c>Exit</c>
+        animation before being removed from the DOM.
+    </p>
+
+    <div class="demo-row">
+        <div class="demo-card" style="min-height:200px; position:relative; overflow:hidden;">
+            <BmotionAnimatePresence IsPresent="@_visible">
+                <Bmotion Tag="div"
+                        Class="box"
+                        Initial="@(new BmotionAnimationProps { Opacity = 0, Y = 40, Scale = 0.8 })"
+                        Animate="@(new BmotionAnimationProps { Opacity = 1, Y = 0,  Scale = 1   })"
+                        Exit="@(new BmotionAnimationProps    { Opacity = 0, Y = -40, Scale = 0.8 })"
+                        Transition="@BmotionTransitionConfig.Spring(stiffness:220, damping:18)" />
+            </BmotionAnimatePresence>
+        </div>
+    </div>
+
+    <button class="btn-bm" style="margin-top:1rem" @onclick="@(() => _visible = !_visible)">
+        @(_visible ? "Remove" : "Add")
+    </button>
+
+    <CodeSnippet Code="@_presenceCode" />
+</div>
+
+<div class="demo-section">
+    <h2>List Items</h2>
+    <p>Add and remove items from a list with staggered enter/exit animations.</p>
+
+    <div class="demo-row">
+        <div class="demo-card" style="flex-direction:column;gap:.5rem;align-items:stretch;width:100%;min-width:280px;">
+            @foreach (var item in _items)
+            {
+                <BmotionAnimatePresence IsPresent="@item.Present" @key="item.Id">
+                    <Bmotion Tag="div"
+                            Style="display:flex;justify-content:space-between;align-items:center;background:rgba(108,71,255,.12);border:1px solid rgba(108,71,255,.25);border-radius:8px;padding:.6rem 1rem;"
+                            Initial="@(new BmotionAnimationProps { Opacity = 0, X = -30 })"
+                            Animate="@(new BmotionAnimationProps { Opacity = 1, X = 0   })"
+                            Exit="@(new BmotionAnimationProps    { Opacity = 0, X = 30  })"
+                            Transition="@BmotionTransitionConfig.Spring(stiffness:300, damping:25)">
+                        <span>@item.Label</span>
+                        <button style="background:none;border:none;color:#ff4785;cursor:pointer;font-size:1.1rem"
+                                aria-label="Remove item"
+                                @onclick="@(() => RemoveItem(item.Id))">✕</button>
+                    </Bmotion>
+                </BmotionAnimatePresence>
+            }
+        </div>
+    </div>
+
+    <button class="btn-bm" style="margin-top:1rem" @onclick="AddItem">Add item</button>
+
+    <CodeSnippet Code="@_listCode" />
+</div>
+
+@code {
+    private bool _visible = true;
+    private int  _nextId  = 4;
+
+    private sealed class Item(int id, string label)
+    {
+        public int Id { get; } = id;
+        public string Label { get; } = label;
+        // Drives the per-item AnimatePresence: flipped to false to play the exit animation
+        // *before* the item is removed from the collection.
+        public bool Present { get; set; } = true;
+    }
+
+    private List<Item> _items = [new(1,"Item One"), new(2,"Item Two"), new(3,"Item Three")];
+
+    void AddItem() => _items.Add(new(_nextId++, $"Item {_nextId - 1}"));
+
+    async Task RemoveItem(int id)
+    {
+        var item = _items.Find(i => i.Id == id);
+        if (item is null || !item.Present) return;
+        item.Present = false;   // trigger the exit animation
+        await Task.Delay(400);  // let it finish before dropping the item from the list
+        _items.Remove(item);
+    }
+
+    private const string _presenceCode = """
+        @using Bit.Bmotion
+
+        <style>
+            :root { --bm-primary: #6c47ff; --bm-secondary: #ff4785; --bm-card: #1e1e2e; }
+            .demo-section { margin-bottom: 3rem; }
+            .demo-section h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: .5rem; }
+            .demo-row { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: center; }
+            .demo-card {
+                background: var(--bm-card); border: 1px solid rgba(255,255,255,.07);
+                border-radius: 12px; padding: 2rem; min-height: 160px; flex: 1; min-width: 220px;
+                display: flex; align-items: center; justify-content: center;
+            }
+            .box {
+                width: 80px; height: 80px; border-radius: 10px;
+                background: linear-gradient(135deg, var(--bm-primary), var(--bm-secondary));
+            }
+            .btn-bm {
+                background: var(--bm-primary); color: #fff; border: none; border-radius: 8px;
+                padding: .6rem 1.4rem; font-weight: 600; cursor: pointer;
+            }
+        </style>
+
+        <div class="demo-section">
+            <h2>AnimatePresence</h2>
+
+            <div class="demo-row">
+                <div class="demo-card" style="min-height:200px; position:relative; overflow:hidden;">
+                    <BmotionAnimatePresence IsPresent="@_visible">
+                        <Bmotion Tag="div"
+                                Class="box"
+                                Initial="@(new BmotionAnimationProps { Opacity = 0, Y = 40, Scale = 0.8 })"
+                                Animate="@(new BmotionAnimationProps { Opacity = 1, Y = 0,  Scale = 1   })"
+                                Exit="@(new BmotionAnimationProps    { Opacity = 0, Y = -40, Scale = 0.8 })"
+                                Transition="@BmotionTransitionConfig.Spring(stiffness:220, damping:18)" />
+                    </BmotionAnimatePresence>
+                </div>
+            </div>
+
+            <button class="btn-bm" style="margin-top:1rem" @onclick="@(() => _visible = !_visible)">
+                @(_visible ? "Remove" : "Add")
+            </button>
+        </div>
+
+        @code {
+            private bool _visible = true;
+        }
+        """;
+
+    private const string _listCode = """
+        @using Bit.Bmotion
+
+        <style>
+            .demo-section { margin-bottom: 3rem; }
+            .demo-section h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: .5rem; }
+            .demo-section p { color: #888; margin-bottom: 1.5rem; line-height: 1.6; }
+            .demo-row { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: center; }
+            .demo-card {
+                background: #1e1e2e; border: 1px solid rgba(255,255,255,.07);
+                border-radius: 12px; padding: 2rem; min-height: 160px; flex: 1; min-width: 220px;
+                display: flex; align-items: center; justify-content: center;
+            }
+            .btn-bm {
+                background: #6c47ff; color: #fff; border: none; border-radius: 8px;
+                padding: .6rem 1.4rem; font-weight: 600; cursor: pointer;
+            }
+        </style>
+
+        <div class="demo-section">
+            <h2>List Items</h2>
+            <p>Add and remove items from a list with staggered enter/exit animations.</p>
+
+            <div class="demo-row">
+                <div class="demo-card" style="flex-direction:column;gap:.5rem;align-items:stretch;width:100%;min-width:280px;">
+                    @foreach (var item in _items)
+                    {
+                        <BmotionAnimatePresence IsPresent="@item.Present" @key="item.Id">
+                            <Bmotion Tag="div"
+                                    Style="display:flex;justify-content:space-between;align-items:center;background:rgba(108,71,255,.12);border:1px solid rgba(108,71,255,.25);border-radius:8px;padding:.6rem 1rem;"
+                                    Initial="@(new BmotionAnimationProps { Opacity = 0, X = -30 })"
+                                    Animate="@(new BmotionAnimationProps { Opacity = 1, X = 0   })"
+                                    Exit="@(new BmotionAnimationProps    { Opacity = 0, X = 30  })"
+                                    Transition="@BmotionTransitionConfig.Spring(stiffness:300, damping:25)">
+                                <span>@item.Label</span>
+                                <button style="background:none;border:none;color:#ff4785;cursor:pointer;font-size:1.1rem"
+                                        aria-label="Remove item"
+                                        @onclick="@(() => RemoveItem(item.Id))">✕</button>
+                            </Bmotion>
+                        </BmotionAnimatePresence>
+                    }
+                </div>
+            </div>
+
+            <button class="btn-bm" style="margin-top:1rem" @onclick="AddItem">Add item</button>
+        </div>
+
+        @code {
+            private int _nextId = 4;
+
+            private sealed class Item(int id, string label)
+            {
+                public int Id { get; } = id;
+                public string Label { get; } = label;
+                public bool Present { get; set; } = true;
+            }
+
+            private List<Item> _items = [new(1,"Item One"), new(2,"Item Two"), new(3,"Item Three")];
+
+            void AddItem() => _items.Add(new(_nextId++, $"Item {_nextId - 1}"));
+
+            async Task RemoveItem(int id)
+            {
+                var item = _items.Find(i => i.Id == id);
+                if (item is null || !item.Present) return;
+                item.Present = false;   // trigger the exit animation
+                await Task.Delay(400);  // let it finish before removing the item
+                _items.Remove(item);
+            }
+        }
+        """;
+}