TekH
b913d5a88a
Refactor the `ToggleThumbnails` method to be asynchronous (`async Task`) to support asynchronous operations. Add logic to re-render thumbnails when toggled on, including forcing a UI update, waiting for DOM rendering, and invoking `RenderThumbnailsAsync`. These changes improve the user experience by ensuring thumbnails are properly updated when displayed.
405 lines
20 KiB
Plaintext
405 lines
20 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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@inject AnnotationService AnnotService
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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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<link href="css/envelope-viewer.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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</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">L<>dt...</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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@if (_pdfLoaded) {
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<div class="pdf-toolbar">
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<div class="pdf-toolbar__section">
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<button class="pdf-toolbar__btn pdf-toolbar__btn--toggle" @onclick="ToggleThumbnails" title="@(_showThumbnails ? "Seitenleiste ausblenden" : "Seitenleiste einblenden")">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16">
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<path d="M1 2.5A1.5 1.5 0 0 1 2.5 1h3A1.5 1.5 0 0 1 7 2.5v3A1.5 1.5 0 0 1 5.5 7h-3A1.5 1.5 0 0 1 1 5.5v-3zm8 0A1.5 1.5 0 0 1 10.5 1h3A1.5 1.5 0 0 1 15 2.5v3A1.5 1.5 0 0 1 13.5 7h-3A1.5 1.5 0 0 1 9 5.5v-3zm-8 8A1.5 1.5 0 0 1 2.5 9h3A1.5 1.5 0 0 1 7 10.5v3A1.5 1.5 0 0 1 5.5 15h-3A1.5 1.5 0 0 1 1 13.5v-3zm8 0A1.5 1.5 0 0 1 10.5 9h3a1.5 1.5 0 0 1 1.5 1.5v3a1.5 1.5 0 0 1-1.5 1.5h-3A1.5 1.5 0 0 1 9 13.5v-3z"/>
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</svg>
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</button>
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</div>
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<div class="pdf-toolbar__divider"></div>
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<div class="pdf-toolbar__section">
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<button class="pdf-toolbar__btn" @onclick="PreviousPage" disabled="@(_currentPage <= 1)" title="Vorherige Seite">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" 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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<div class="pdf-toolbar__page-input-group">
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<input type="number" class="pdf-toolbar__page-input" min="1" max="@_totalPages" value="@_currentPage" @onchange="OnPageInputChanged" />
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<span class="pdf-toolbar__page-total">/ @_totalPages</span>
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</div>
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<button class="pdf-toolbar__btn" @onclick="NextPage" disabled="@(_currentPage >= _totalPages)" title="Nächste Seite">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" 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 class="pdf-toolbar__divider"></div>
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<div class="pdf-toolbar__section pdf-toolbar__zoom-section">
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<button class="pdf-toolbar__btn" @onclick="ZoomOut" disabled="@(_currentZoom <= 50)" title="Verkleinern">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16">
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<path d="M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.1zM12 6.5a5.5 5.5 0 1 1-11 0 5.5 5.5 0 0 1 11 0zM4 6a.5.5 0 0 0 0 1h5a.5.5 0 0 0 0-1H4z"/>
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</svg>
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</button>
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<div class="pdf-toolbar__zoom-slider-container">
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<input type="range" class="pdf-toolbar__zoom-slider" min="50" max="300" step="1" value="@_currentZoom" @oninput="OnZoomSliderChanged" title="@(_currentZoom)%" />
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<div class="pdf-toolbar__zoom-label">@(_currentZoom)%</div>
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</div>
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<button class="pdf-toolbar__btn" @onclick="ZoomIn" disabled="@(_currentZoom >= 300)" title="Vergrößern">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16">
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<path d="M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.1zM12 6.5a5.5 5.5 0 1 1-11 0 5.5 5.5 0 0 1 11 0zM6.5 3a.5.5 0 0 0-1 0v2.5H3a.5.5 0 0 0 0 1h2.5V9a.5.5 0 0 0 1 0V6.5H9a.5.5 0 0 0 0-1H6.5V3z"/>
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</svg>
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</button>
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</div>
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<div class="pdf-toolbar__divider"></div>
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<div class="pdf-toolbar__section">
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<button class="pdf-toolbar__btn pdf-toolbar__btn--preset" @onclick="() => SetZoom(100)" title="Tatsächliche Größe">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16" class="me-1">
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<path d="M8 4.754a3.246 3.246 0 1 0 0 6.492 3.246 3.246 0 0 0 0-6.492zM5.754 8a2.246 2.246 0 1 1 4.492 0 2.246 2.246 0 0 1-4.492 0z"/>
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<path d="M9.796 1.343c-.527-1.79-3.065-1.79-3.592 0l-.094.319a.873.873 0 0 1-1.255.52l-.292-.16c-1.64-.892-3.433.902-2.54 2.541l.159.292a.873.873 0 0 1-.52 1.255l-.319.094c-1.79.527-1.79 3.065 0 3.592l.319.094a.873.873 0 0 1 .52 1.255l-.16.292c-.892 1.64.901 3.434 2.541 2.54l.292-.159a.873.873 0 0 1 1.255.52l.094.319c.527 1.79 3.065 1.79 3.592 0l.094-.319a.873.873 0 0 1 1.255-.52l.292.16c1.64.893 3.434-.902 2.54-2.541l-.159-.292a.873.873 0 0 1 .52-1.255l.319-.094c1.79-.527 1.79-3.065 0-3.592l-.319-.094a.873.873 0 0 1-.52-1.255l.16-.292c.893-1.64-.902-3.433-2.541-2.54l-.292.159a.873.873 0 0 1-1.255-.52l-.094-.319z"/>
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</svg>
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100%
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</button>
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<button class="pdf-toolbar__btn pdf-toolbar__btn--preset" @onclick="FitToWidth" title="An Breite anpassen">
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<svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" fill="currentColor" viewBox="0 0 16 16" class="me-1">
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<path d="M1 3.5a.5.5 0 0 1 .5-.5h13a.5.5 0 0 1 0 1h-13a.5.5 0 0 1-.5-.5zM7.5 7a.5.5 0 0 0 0 1h1a.5.5 0 0 0 0-1h-1z"/>
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<path d="M0 2a2 2 0 0 1 2-2h12a2 2 0 0 1 2 2v12a2 2 0 0 1-2 2H2a2 2 0 0 1-2-2V2zm1 0v12a1 1 0 0 0 1 1h12a1 1 0 0 0 1-1V2a1 1 0 0 0-1-1H2a1 1 0 0 0-1 1z"/>
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</svg>
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Breite
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</button>
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</div>
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</div>
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}
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<div class="pdf-frame">
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@if (_pdfLoaded && _showThumbnails) {
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<!-- PDF Thumbnail Sidebar -->
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<div class="pdf-thumbnails" style="width: @(_thumbnailWidth)px">
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<div class="pdf-thumbnails__content">
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@for (int i = 1; i <= _totalPages; i++) {
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var pageNum = i;
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<div class="pdf-thumbnail @(pageNum == _currentPage ? "pdf-thumbnail--active" : "")" @onclick="() => GoToPageFromThumbnail(pageNum)">
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<div class="pdf-thumbnail__preview">
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<canvas id="thumb-canvas-@pageNum" class="pdf-thumbnail__canvas"></canvas>
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</div>
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<div class="pdf-thumbnail__label">@pageNum</div>
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</div>
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}
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</div>
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</div>
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<!-- Resizable Splitter -->
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<div class="pdf-splitter @(_isResizing ? "resizing" : "")"
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@onmousedown="OnSplitterMouseDown"
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@onmousedown:preventDefault="true">
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</div>
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}
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<div class="pdf-canvas-wrapper">
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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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</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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@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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bool _showThumbnails = true;
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DotNetObjectReference<EnvelopeViewer>? _dotNetRef;
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// Resizable splitter state
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int _thumbnailWidth = 260;
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bool _isResizing = false;
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int _resizeStartX = 0;
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int _resizeStartWidth = 0;
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const int MinThumbnailWidth = 150;
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const int MaxThumbnailWidth = 400;
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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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} else {
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_errorMessage = $"Dokument konnte nicht geladen werden. HTTP Status: {statusCode}";
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}
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var annots = await AnnotService.GetAnnotationsAsync(EnvelopeKey);
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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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await InvokeAsync(StateHasChanged);
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}
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protected override async Task OnAfterRenderAsync(bool firstRender) {
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if (firstRender) {
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// Load saved thumbnail width from localStorage
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try {
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var savedWidth = await JSRuntime.InvokeAsync<string>("localStorage.getItem", "envelopeViewer_thumbnailWidth");
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if (!string.IsNullOrEmpty(savedWidth) && int.TryParse(savedWidth, out var width)) {
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_thumbnailWidth = Math.Clamp(width, MinThumbnailWidth, MaxThumbnailWidth);
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await InvokeAsync(StateHasChanged);
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}
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} catch {
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// Ignore localStorage errors
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}
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}
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if (!_pdfLoaded && !string.IsNullOrWhiteSpace(_pdfDataUrl)) {
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await Task.Delay(500);
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try {
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_dotNetRef = DotNetObjectReference.Create(this);
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var success = await JSRuntime.InvokeAsync<bool>("pdfViewer.initialize", "pdf-canvas", _pdfDataUrl, _dotNetRef);
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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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// Attach resize listeners
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await JSRuntime.InvokeVoidAsync("pdfViewer.attachResizeListeners", _dotNetRef);
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await InvokeAsync(StateHasChanged);
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// Wait for DOM to be ready, then render thumbnails
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await Task.Delay(100);
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await RenderThumbnailsAsync();
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}
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} catch (Exception ex) {
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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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[JSInvokable]
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public async Task OnZoomChanged(double scale)
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{
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_currentZoom = (int)(scale * 100);
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await InvokeAsync(StateHasChanged);
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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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if (_currentZoom >= 300) return;
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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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if (_currentZoom <= 50) return;
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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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async Task SetZoom(int percentage) {
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var scale = percentage / 100.0;
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await JSRuntime.InvokeVoidAsync("pdfViewer.setScale", scale);
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_currentZoom = percentage;
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}
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async Task OnZoomSliderChanged(ChangeEventArgs e) {
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if (int.TryParse(e.Value?.ToString(), out var zoom)) {
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await SetZoom(zoom);
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}
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}
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async Task OnPageInputChanged(ChangeEventArgs e) {
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if (int.TryParse(e.Value?.ToString(), out var pageNum) && pageNum >= 1 && pageNum <= _totalPages) {
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if (await JSRuntime.InvokeAsync<bool>("pdfViewer.goToPage", pageNum)) {
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_currentPage = pageNum;
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}
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}
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}
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async Task FitToWidth() {
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await JSRuntime.InvokeVoidAsync("pdfViewer.fitToWidth");
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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 ToggleThumbnails() {
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_showThumbnails = !_showThumbnails;
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// Re-render thumbnails when showing them
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if (_showThumbnails && _pdfLoaded) {
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await InvokeAsync(StateHasChanged); // Force UI update first
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await Task.Delay(150); // Wait for DOM to render canvas elements
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await RenderThumbnailsAsync();
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}
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}
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async Task GoToPageFromThumbnail(int pageNum) {
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if (await JSRuntime.InvokeAsync<bool>("pdfViewer.goToPage", pageNum)) {
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_currentPage = pageNum;
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}
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}
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async Task RenderThumbnailsAsync() {
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try {
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// Sequential rendering to avoid overwhelming the browser
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for (int i = 1; i <= _totalPages; i++) {
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await JSRuntime.InvokeVoidAsync("pdfViewer.renderThumbnail", i, $"thumb-canvas-{i}");
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// Small delay between renders to keep UI responsive
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if (i < _totalPages) {
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await Task.Delay(50);
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}
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}
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} catch (Exception ex) {
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// Thumbnail rendering is not critical
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System.Diagnostics.Debug.WriteLine($"Thumbnail rendering error: {ex.Message}");
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}
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}
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// Resizable splitter methods
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void OnSplitterMouseDown(MouseEventArgs e) {
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_isResizing = true;
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_resizeStartX = (int)e.ClientX;
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_resizeStartWidth = _thumbnailWidth;
|
||
|
||
// Add resizing class to body to prevent text selection
|
||
_ = JSRuntime.InvokeVoidAsync("eval", "document.body.classList.add('resizing')");
|
||
_ = JSRuntime.InvokeVoidAsync("pdfViewer.startResize");
|
||
}
|
||
|
||
[JSInvokable]
|
||
public async Task OnSplitterMouseMove(int clientX) {
|
||
if (!_isResizing) return;
|
||
|
||
var delta = clientX - _resizeStartX;
|
||
var newWidth = _resizeStartWidth + delta;
|
||
|
||
// Clamp to min/max
|
||
_thumbnailWidth = Math.Clamp(newWidth, MinThumbnailWidth, MaxThumbnailWidth);
|
||
|
||
await InvokeAsync(StateHasChanged);
|
||
}
|
||
|
||
[JSInvokable]
|
||
public async Task OnSplitterMouseUp() {
|
||
if (!_isResizing) return;
|
||
|
||
_isResizing = false;
|
||
|
||
// Remove resizing class from body
|
||
await JSRuntime.InvokeVoidAsync("eval", "document.body.classList.remove('resizing')");
|
||
|
||
// Save preference to localStorage
|
||
await JSRuntime.InvokeVoidAsync("localStorage.setItem", "envelopeViewer_thumbnailWidth", _thumbnailWidth.ToString());
|
||
|
||
await InvokeAsync(StateHasChanged);
|
||
}
|
||
|
||
public async ValueTask DisposeAsync() {
|
||
if (_pdfLoaded) {
|
||
try {
|
||
await JSRuntime.InvokeVoidAsync("pdfViewer.dispose");
|
||
} catch {
|
||
// Ignore errors during disposal
|
||
}
|
||
}
|
||
_dotNetRef?.Dispose();
|
||
}
|
||
}
|