TekH
f4b78bce36
Introduced a new Blazor component `EnvelopeViewer.razor` to display PDF documents with a user-friendly interface. The component supports dynamic routing via `/envelope/{EnvelopeKey}` and integrates the `pdf.js` library for efficient PDF rendering in the browser.
Key features include:
- Zoom and navigation controls (Next/Previous page, Zoom In/Out).
- Loading spinner, error handling, and fallback UI for robustness.
- Responsive design with modern styling using CSS.
- JavaScript interop via `pdf-viewer.js` for managing PDF rendering, scaling, and navigation.
Added lifecycle methods (`OnInitializedAsync`, `OnAfterRenderAsync`) for dynamic loading and rendering. Ensured asynchronous operations for smooth user interactions. Included a `DisposeAsync` method for cleanup.
377 lines
14 KiB
Plaintext
377 lines
14 KiB
Plaintext
@page "/envelope/{EnvelopeKey}"
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@using EnvelopeGenerator.ReceiverUI.Services
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@using Microsoft.Extensions.Options
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@using EnvelopeGenerator.ReceiverUI.Options
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@using Microsoft.JSInterop
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@inject DocumentService DocumentService
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@inject NavigationManager Navigation
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@inject IOptions<ApiOptions> AppOptions
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@inject IJSRuntime JSRuntime
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@implements IAsyncDisposable
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<link href="_content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css" rel="stylesheet" />
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<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
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<script src="js/pdf-viewer.js"></script>
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<div class="envelope-viewer-layout">
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<div class="envelope-action-bar">
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<div class="envelope-action-bar__inner">
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<div class="d-flex align-items-center gap-3">
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<div class="envelope-logo">
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<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="currentColor" viewBox="0 0 16 16">
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<path d="M14 4.5V14a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V2a2 2 0 0 1 2-2h5.5L14 4.5zm-3 0A1.5 1.5 0 0 1 9.5 3V1H4a1 1 0 0 0-1 1v12a1 1 0 0 0 1 1h8a1 1 0 0 0 1-1V4.5h-2z"/>
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</svg>
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</div>
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<div>
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<div class="envelope-title">Dokumentenansicht</div>
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<div class="envelope-key">ID: @EnvelopeKey</div>
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</div>
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</div>
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@if (_pdfLoaded) {
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<div class="d-flex align-items-center gap-2 ms-auto">
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<div class="pdf-controls">
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<button class="btn btn-sm btn-outline-primary" @onclick="ZoomOut" title="Zoom Out">
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
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<path d="M6.5 1A5.5 5.5 0 0 0 1 6.5v3A5.5 5.5 0 0 0 6.5 15h3a5.5 5.5 0 0 0 5.5-5.5v-3A5.5 5.5 0 0 0 9.5 1h-3zM4 8a.5.5 0 0 1 .5-.5h7a.5.5 0 0 1 0 1h-7A.5.5 0 0 1 4 8z"/>
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</svg>
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</button>
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<span class="zoom-level">@(_currentZoom)%</span>
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<button class="btn btn-sm btn-outline-primary" @onclick="ZoomIn" title="Zoom In">
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
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<path d="M6.5 1A5.5 5.5 0 0 0 1 6.5v3A5.5 5.5 0 0 0 6.5 15h3a5.5 5.5 0 0 0 5.5-5.5v-3A5.5 5.5 0 0 0 9.5 1h-3zM8 4a.5.5 0 0 1 .5.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3A.5.5 0 0 1 8 4z"/>
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</svg>
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</button>
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</div>
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<div class="pdf-navigation">
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<button class="btn btn-sm btn-primary" @onclick="PreviousPage" disabled="@(_currentPage <= 1)">
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
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<path fill-rule="evenodd" d="M11.354 1.646a.5.5 0 0 1 0 .708L5.707 8l5.647 5.646a.5.5 0 0 1-.708.708l-6-6a.5.5 0 0 1 0-.708l6-6a.5.5 0 0 1 .708 0z"/>
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</svg>
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</button>
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<span class="page-info">Seite @_currentPage / @_totalPages</span>
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<button class="btn btn-sm btn-primary" @onclick="NextPage" disabled="@(_currentPage >= _totalPages)">
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<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
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<path fill-rule="evenodd" d="M4.646 1.646a.5.5 0 0 1 .708 0l6 6a.5.5 0 0 1 0 .708l-6 6a.5.5 0 0 1-.708-.708L10.293 8 4.646 2.354a.5.5 0 0 1 0-.708z"/>
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</svg>
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</button>
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</div>
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</div>
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}
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</div>
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</div>
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<div class="envelope-content">
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@if (_isLoading) {
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<div class="d-flex justify-content-center align-items-center h-100">
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<div class="text-center">
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<div class="spinner-border text-white mb-3" style="width: 3.5rem; height: 3.5rem;" role="status">
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<span class="visually-hidden">Lädt...</span>
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</div>
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<p class="text-white fw-semibold">Dokument wird geladen...</p>
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</div>
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</div>
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} else if (_errorMessage is not null) {
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<div class="error-container">
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<div class="alert alert-danger shadow-lg">
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<div class="d-flex align-items-start">
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<svg xmlns="http://www.w3.org/2000/svg" width="28" height="28" fill="currentColor" class="me-3 flex-shrink-0" viewBox="0 0 16 16">
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<path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14zm0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16z"/>
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<path d="M7.002 11a1 1 0 1 1 2 0 1 1 0 0 1-2 0zM7.1 4.995a.905.905 0 1 1 1.8 0l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 4.995z"/>
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</svg>
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<div>
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<h5 class="mb-2">Fehler beim Laden des Dokuments</h5>
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<p class="mb-0">@_errorMessage</p>
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</div>
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</div>
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</div>
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</div>
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} else if (!string.IsNullOrWhiteSpace(_pdfDataUrl)) {
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<div class="pdf-viewer-container">
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<div class="pdf-frame">
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<canvas id="pdf-canvas" class="pdf-canvas"></canvas>
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</div>
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</div>
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} else {
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<div class="error-container">
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<div class="alert alert-warning shadow-lg">
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<div class="d-flex align-items-center">
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<svg xmlns="http://www.w3.org/2000/svg" width="28" height="28" fill="currentColor" class="me-3" viewBox="0 0 16 16">
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<path d="M8.982 1.566a1.13 1.13 0 0 0-1.96 0L.165 13.233c-.457.778.091 1.767.98 1.767h13.713c.889 0 1.438-.99.98-1.767L8.982 1.566zM8 5c.535 0 .954.462.9.995l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 5.995A.905.905 0 0 1 8 5zm.002 6a1 1 0 1 1 0 2 1 1 0 0 1 0-2z"/>
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</svg>
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<span class="fs-5">Dokument konnte nicht geladen werden.</span>
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</div>
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</div>
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</div>
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}
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</div>
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</div>
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<style>
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.envelope-viewer-layout {
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display: flex;
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flex-direction: column;
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height: 100vh;
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overflow: hidden;
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background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #7e22ce 100%);
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}
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.envelope-action-bar {
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background: rgba(255, 255, 255, 0.95);
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backdrop-filter: blur(20px);
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border-bottom: 3px solid rgba(126, 34, 206, 0.3);
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padding: 1.25rem 2rem;
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flex-shrink: 0;
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box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
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}
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.envelope-action-bar__inner {
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max-width: 1600px;
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margin: 0 auto;
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display: flex;
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align-items: center;
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gap: 2rem;
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}
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.envelope-logo svg {
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filter: drop-shadow(0 2px 4px rgba(126, 34, 206, 0.3));
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color: #7e22ce;
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}
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.envelope-title {
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font-size: 1.125rem;
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font-weight: 700;
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color: #1e293b;
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letter-spacing: -0.025em;
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}
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.envelope-key {
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font-size: 0.8125rem;
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color: #64748b;
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font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
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font-weight: 500;
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margin-top: 0.25rem;
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}
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.pdf-controls, .pdf-navigation {
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display: flex;
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align-items: center;
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gap: 0.75rem;
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}
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.zoom-level, .page-info {
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font-size: 0.875rem;
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font-weight: 600;
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color: #475569;
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min-width: 60px;
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text-align: center;
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}
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.envelope-content {
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flex: 1;
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min-height: 0;
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padding: 1.5rem;
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position: relative;
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overflow: auto;
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}
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.pdf-viewer-container {
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height: 100%;
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display: flex;
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align-items: flex-start;
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justify-content: center;
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padding: 0;
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}
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.pdf-frame {
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background: white;
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border-radius: 16px;
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box-shadow:
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0 25px 50px -12px rgba(0, 0, 0, 0.25),
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0 0 0 1px rgba(255, 255, 255, 0.1);
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overflow: auto;
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position: relative;
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padding: 2rem;
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max-height: 100%;
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width: auto;
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}
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.pdf-frame::before {
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content: '';
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position: absolute;
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top: 0;
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left: 0;
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right: 0;
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height: 4px;
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background: linear-gradient(90deg, #7e22ce 0%, #2a5298 100%);
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z-index: 1;
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}
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.pdf-canvas {
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display: block;
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box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
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margin: 0 auto;
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}
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.error-container {
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display: flex;
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align-items: center;
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justify-content: center;
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height: 100%;
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padding: 2rem;
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}
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.alert {
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border-radius: 12px;
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border: none;
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padding: 2rem;
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max-width: 600px;
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}
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.alert-danger {
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background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
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color: #be123c;
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border-left: 4px solid #e11d48;
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}
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.alert-warning {
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background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
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color: #92400e;
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border-left: 4px solid #f59e0b;
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}
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.spinner-border {
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border-width: 0.35rem;
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}
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@@media (max-width: 768px) {
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.envelope-content {
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padding: 0.75rem;
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}
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.pdf-frame {
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border-radius: 12px;
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padding: 1rem;
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}
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.envelope-action-bar {
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padding: 1rem 1.25rem;
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}
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.envelope-action-bar__inner {
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flex-wrap: wrap;
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}
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.envelope-title {
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font-size: 1rem;
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}
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.envelope-key {
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font-size: 0.75rem;
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}
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.envelope-logo svg {
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width: 20px;
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height: 20px;
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}
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.alert {
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padding: 1.5rem;
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}
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}
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</style>
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@code {
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[Parameter] public string? EnvelopeKey { get; set; }
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bool _isLoading = true;
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string? _errorMessage;
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string? _pdfDataUrl;
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bool _pdfLoaded = false;
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int _currentPage = 1;
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int _totalPages = 0;
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int _currentZoom = 150;
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protected override async Task OnInitializedAsync() {
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if (string.IsNullOrWhiteSpace(EnvelopeKey)) {
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_errorMessage = "Envelope-Schlüssel fehlt.";
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_isLoading = false;
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return;
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}
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try {
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var (pdfBytes, statusCode) = await DocumentService.GetDocumentAsync(EnvelopeKey);
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if (pdfBytes is { Length: > 0 }) {
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var base64 = Convert.ToBase64String(pdfBytes);
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_pdfDataUrl = $"data:application/pdf;base64,{base64}";
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Console.WriteLine($"PDF data ready, length: {_pdfDataUrl.Length}");
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} else {
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_errorMessage = $"Dokument konnte nicht geladen werden. HTTP Status: {statusCode}";
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}
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} catch (Exception ex) {
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_errorMessage = $"Fehler: {ex.Message}";
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}
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_isLoading = false;
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// CRITICAL: Force re-render after data is loaded
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await InvokeAsync(StateHasChanged);
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}
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protected override async Task OnAfterRenderAsync(bool firstRender) {
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Console.WriteLine($"OnAfterRenderAsync called - firstRender: {firstRender}, _pdfDataUrl: {(_pdfDataUrl != null ? "exists" : "null")}, _pdfLoaded: {_pdfLoaded}");
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// Only initialize once when data is ready and not already loaded
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if (!_pdfLoaded && !string.IsNullOrWhiteSpace(_pdfDataUrl)) {
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// Wait for DOM and scripts
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await Task.Delay(500);
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try {
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Console.WriteLine("Calling pdfViewer.initialize...");
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var success = await JSRuntime.InvokeAsync<bool>("pdfViewer.initialize", "pdf-canvas", _pdfDataUrl);
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Console.WriteLine($"Initialize returned: {success}");
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if (success) {
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_pdfLoaded = true;
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_totalPages = await JSRuntime.InvokeAsync<int>("pdfViewer.getTotalPages");
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_currentPage = await JSRuntime.InvokeAsync<int>("pdfViewer.getCurrentPage");
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Console.WriteLine($"PDF loaded - Pages: {_totalPages}, Current: {_currentPage}");
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await InvokeAsync(StateHasChanged);
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}
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} catch (Exception ex) {
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Console.WriteLine($"Exception: {ex.Message}\nStack: {ex.StackTrace}");
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_errorMessage = $"PDF.js Fehler: {ex.Message}";
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await InvokeAsync(StateHasChanged);
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}
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}
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}
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async Task NextPage() {
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if (await JSRuntime.InvokeAsync<bool>("pdfViewer.nextPage")) {
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_currentPage = await JSRuntime.InvokeAsync<int>("pdfViewer.getCurrentPage");
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}
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}
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async Task PreviousPage() {
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if (await JSRuntime.InvokeAsync<bool>("pdfViewer.previousPage")) {
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_currentPage = await JSRuntime.InvokeAsync<int>("pdfViewer.getCurrentPage");
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}
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}
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async Task ZoomIn() {
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await JSRuntime.InvokeVoidAsync("pdfViewer.zoomIn");
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var scale = await JSRuntime.InvokeAsync<double>("pdfViewer.getScale");
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_currentZoom = (int)(scale * 100);
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}
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async Task ZoomOut() {
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await JSRuntime.InvokeVoidAsync("pdfViewer.zoomOut");
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var scale = await JSRuntime.InvokeAsync<double>("pdfViewer.getScale");
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_currentZoom = (int)(scale * 100);
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}
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public async ValueTask DisposeAsync() {
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// Cleanup if needed
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}
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}
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