971011: How to Customize Diagram Interactions Using Native Blazor Events

KB-Samples/InteractionCustomizationWithNativeEvents/App.razor

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+@namespace InteractionCustomizationWithNativeEvents
+<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>
+

KB-Samples/InteractionCustomizationWithNativeEvents/InteractionCustomizationWithNativeEvents_NET8.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Blazor.Diagram" Version="*" />
+    <PackageReference Include="Syncfusion.Blazor.Themes" Version="*" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="wwwroot\" />
+  </ItemGroup>
+</Project>

KB-Samples/InteractionCustomizationWithNativeEvents/InteractionCustomizationWithNativeEvents_NET9.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Syncfusion.Blazor.Diagram" Version="*" />
+    <PackageReference Include="Syncfusion.Blazor.Themes" Version="*" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="wwwroot\" />
+  </ItemGroup>
+</Project>

KB-Samples/InteractionCustomizationWithNativeEvents/Pages/Index.razor

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+@page "/"
+@using Syncfusion.Blazor.Diagram
+
+<div style="width: 100%; height: 600px;" @onmousedown="OnMouseDown" @onmouseup="OnMouseUp">
+    <SfDiagramComponent @ref="@diagram"
+                        PositionChanging="OnPositionChanging"
+                        Height="600px"
+                        Width="100%"
+                        Nodes="@nodes">
+        <ContextMenuSettings Show="true"></ContextMenuSettings>
+    </SfDiagramComponent>
+</div>
+
+@code {
+    @code {
+        SfDiagramComponent diagram;
+        DiagramObjectCollection<Node> nodes = new DiagramObjectCollection<Node>();
+        bool isLeftMouseButton = false;
+
+        protected override void OnInitialized()
+        {
+            InitializeNodes();
+        }
+
+        // Captures mouse button press events
+        private void OnMouseDown(MouseEventArgs args)
+        {
+            if (args.Button == 0) // 0 = Left button, 1 = Middle button, 2 = Right button
+                isLeftMouseButton = true;
+        }
+
+        // Captures mouse button release events
+        private void OnMouseUp(MouseEventArgs args)
+        {
+            isLeftMouseButton = false;
+        }
+
+        // Controls drag operations based on mouse button state
+        private void OnPositionChanging(PositionChangingEventArgs args)
+        {
+            if (!isLeftMouseButton)
+            {
+                args.Cancel = true; // Prevents dragging for non-left clicks
+            }
+        }
+
+        private void InitializeNodes()
+        {
+            Node node = new Node()
+            {
+                ID = "node1",
+                Width = 100,
+                Height = 100,
+                OffsetX = 300,
+                OffsetY = 200,
+                Style = new ShapeStyle()
+                {
+                    Fill = "#6495ED",
+                    StrokeColor = "#4169E1",
+                    StrokeWidth = 2
+                },
+                Shape = new BasicShape()
+                {
+                    Type = NodeShapes.Basic,
+                    Shape = NodeBasicShapes.Rectangle
+                },
+                Annotations = new DiagramObjectCollection<ShapeAnnotation>()
+           {
+               new ShapeAnnotation
+               {
+                   Content = "Node",
+                   Style = new TextStyle()
+                   {
+                       Color = "white",
+                       FontSize = 12,
+                       FontFamily = "Arial"
+                   }
+               }
+           }
+            };
+            nodes.Add(node);
+        }
+    }
+}

KB-Samples/InteractionCustomizationWithNativeEvents/Pages/_Host.cshtml

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+@page "/"
+@namespace InteractionCustomizationWithNativeEvents.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+@{
+    Layout = "_Layout";
+}
+
+<component type="typeof(App)" render-mode="ServerPrerendered" />

KB-Samples/InteractionCustomizationWithNativeEvents/Pages/_Layout.cshtml

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+@using Microsoft.AspNetCore.Components.Web
+@namespace InteractionCustomizationWithNativeEvents.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <base href="~/" />
+    <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
+    <link href="css/site.css" rel="stylesheet" />
+     <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
+<link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
+    <component type="typeof(HeadOutlet)" render-mode="ServerPrerendered" />
+</head>
+<body>
+    @RenderBody()
+
+
+
+    <script src="_framework/blazor.server.js"></script>
+</body>
+</html>

KB-Samples/InteractionCustomizationWithNativeEvents/Program.cs

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+
+using Microsoft.AspNetCore.Components;
+using Microsoft.AspNetCore.Components.Web;
+using Syncfusion.Blazor;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+builder.Services.AddRazorPages();
+builder.Services.AddServerSideBlazor();
+builder.Services.AddSyncfusionBlazor();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error");
+    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+    app.UseHsts();
+}
+
+app.UseHttpsRedirection();
+
+app.UseStaticFiles();
+
+app.UseRouting();
+
+app.MapBlazorHub();
+app.MapFallbackToPage("/_Host");
+
+app.Run();

KB-Samples/InteractionCustomizationWithNativeEvents/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:11920",
+      "sslPort": 44341
+    }
+  },
+  "profiles": {
+    "InteractionCustomizationWithNativeEvents": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7204;http://localhost:5236",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

KB-Samples/InteractionCustomizationWithNativeEvents/Shared/MainLayout.razor

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+@namespace InteractionCustomizationWithNativeEvents.Shared
+@inherits LayoutComponentBase
+
+<PageTitle>InteractionCustomizationWithNativeEvents</PageTitle>
+
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
+    </div>
+
+
+    <main>
+
+        <article class="content px-4">
+            @Body
+        </article>
+    </main>
+</div>

KB-Samples/InteractionCustomizationWithNativeEvents/Shared/MainLayout.razor.css

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+.page {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex: 1;
+}
+
+.sidebar {
+    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+}
+
+.top-row {
+    background-color: #f7f7f7;
+    border-bottom: 1px solid #d6d5d5;
+    justify-content: flex-end;
+    height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+    .top-row ::deep a, .top-row .btn-link {
+        white-space: nowrap;
+        margin-left: 1.5rem;
+    }
+
+    .top-row a:first-child {
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+
+@media (max-width: 640.98px) {
+    .top-row:not(.auth) {
+        display: none;
+    }
+
+    .top-row.auth {
+        justify-content: space-between;
+    }
+
+    .top-row a, .top-row .btn-link {
+        margin-left: 0;
+    }
+}
+
+@media (min-width: 641px) {
+    .page {
+        flex-direction: row;
+    }
+
+    .sidebar {
+        width: 250px;
+        height: 100vh;
+        position: sticky;
+        top: 0;
+    }
+
+    .top-row {
+        position: sticky;
+        top: 0;
+        z-index: 1;
+    }
+
+    .top-row, article {
+        padding-left: 2rem !important;
+        padding-right: 1.5rem !important;
+    }
+}

KB-Samples/InteractionCustomizationWithNativeEvents/_Imports.razor

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+@using System.Net.Http
+@using Microsoft.AspNetCore.Authorization
+@using Microsoft.AspNetCore.Components.Authorization
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.AspNetCore.Components.Web.Virtualization
+@using Microsoft.JSInterop
+@using InteractionCustomizationWithNativeEvents
+@using InteractionCustomizationWithNativeEvents.Shared

KB-Samples/InteractionCustomizationWithNativeEvents/appsettings.Development.json

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+{
+  "DetailedErrors": true,
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

KB-Samples/InteractionCustomizationWithNativeEvents/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}