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Enhance PDF viewer and add embed page with file upload

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- Added CSS styles for `.pdf-viewer` and its child elements
  to ensure proper dimensions and layout for PDF display.
- Enhanced `EnvelopeReceiverPage_DxPdfViewer.razor` with
  conditional rendering for improved user feedback.
- Introduced `EnvelopeReceiverPage_embed.razor` with a new
  route `/envelope/Embed`, drag-and-drop file upload, and
  embedded PDF viewer using `<embed>`.
- Implemented default PDF loading from embedded resources
  and Base64 encoding for embedding.
- Refactored file upload handling with `OnFilesUploading`
  and centralized allowed file types logic.
- Improved user experience with success and informational
  messages for file upload and PDF viewing.
This commit is contained in:
tekh
2026-06-11 17:13:17 +02:00
parent d722742fe8
commit 0780dbdd94
2 changed files with 157 additions and 2 deletions
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34
EnvelopeGenerator.ReceiverUI/Pages/EnvelopeReceiverPage_DxPdfViewer.razor
View File

@@ -30,6 +30,24 @@
.custom-drop-zone > *:not(#overviewDemoSelectButton) {
pointer-events: none;
}
.pdf-viewer {
height: 800px !important;
min-height: 800px !important;
}
.pdf-viewer .dxbrv-surface-wrapper,
.pdf-viewer .dxbrv-document-surface {
height: 100% !important;
min-height: 750px !important;
}
.pdf-viewer .dxbrv-report-preview-content {
width: auto !important;
height: auto !important;
min-width: 200px !important;
min-height: 200px !important;
}
</style>
<div id="overviewDemoDropZone" class="card custom-drop-zone rounded-3 w-100 m-0">
@@ -50,7 +68,20 @@
FilesUploading="OnFilesUploading"
MaxFileSize="2000000">
</DxFileInput>
<DxPdfViewer CssClass="w-100 pdf-viewer" DocumentContent="DocumentContent" />
@if (DocumentContent != null && DocumentContent.Length > 0)
{
<div class="alert alert-success mt-3">
PDF loaded: @DocumentContent.Length bytes
</div>
<DxPdfViewer CssClass="w-100 pdf-viewer" DocumentContent="@DocumentContent" />
}
else
{
<div class="alert alert-info mt-3">
Please upload a PDF file to view it.
</div>
}
@code {
readonly List<string> ALLOWED_FILE_TYPES = new List<string> { ".pdf" };
@@ -78,3 +109,4 @@
}
}
}

123
EnvelopeGenerator.ReceiverUI/Pages/EnvelopeReceiverPage_embed.razor Normal file
View File

@@ -0,0 +1,123 @@
@page "/envelope/Embed"
@using System.IO
@using DevExpress.Blazor
@using System.Reflection
<link href="_content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css" rel="stylesheet" />
<style>
.custom-drop-zone {
padding: 0 !important;
border-style: dashed;
border-width: 2px !important;
height: 230px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
background-color: rgba(183, 183, 183, 0.1);
}
.custom-drop-zone.custom-drop-zone-hover {
border-style: solid;
}
.custom-drop-zone svg {
width: 42px;
height: 42px;
}
.custom-drop-zone > *:not(#overviewDemoSelectButton) {
pointer-events: none;
}
.pdf-viewer {
height: 800px !important;
min-height: 800px !important;
}
.pdf-viewer .dxbrv-surface-wrapper,
.pdf-viewer .dxbrv-document-surface {
height: 100% !important;
min-height: 750px !important;
}
.pdf-viewer .dxbrv-report-preview-content {
width: auto !important;
height: auto !important;
min-width: 200px !important;
min-height: 200px !important;
}
</style>
<div id="overviewDemoDropZone" class="card custom-drop-zone rounded-3 w-100 m-0">
<span class="drop-file-icon mb-3"></span>
<span class="drop-file-label">Drag and Drop File Here</span><span class="m-1">or</span>
<DxButton Id="overviewDemoSelectButton"
CssClass="m-1"
RenderStyle="ButtonRenderStyle.Primary"
Text="Select File" />
</div>
<DxFileInput @ref="fileInput"
AcceptedFileTypes="@ALLOWED_FILE_TYPES"
AllowedFileExtensions="@ALLOWED_FILE_TYPES"
CssClass="w-100"
ExternalDropZoneCssSelector="#overviewDemoDropZone"
ExternalDropZoneDragOverCssClass="custom-drop-zone-hover"
ExternalSelectButtonCssSelector="#overviewDemoSelectButton"
FilesUploading="OnFilesUploading"
MaxFileSize="2000000">
</DxFileInput>
@if (DocumentContent != null && DocumentContent.Length > 0)
{
<div class="alert alert-success mt-3">
PDF loaded: @DocumentContent.Length bytes
</div>
<embed src="@GetPdfDataUrl()" type="application/pdf" class="w-100 pdf-viewer" />
}
else
{
<div class="alert alert-info mt-3">
Please upload a PDF file to view it.
</div>
}
@code {
readonly List<string> ALLOWED_FILE_TYPES = new List<string> { ".pdf" };
DxFileInput fileInput;
byte[] DocumentContent { get; set; }
protected override void OnInitialized()
{
Assembly assembly = Assembly.GetExecutingAssembly();
Stream stream = assembly.GetManifestResourceStream("EnvelopeGenerator.ReceiverUI.Resources.Invoice.pdf");
if (stream != null)
{
using (stream)
using (var binaryReader = new BinaryReader(stream))
DocumentContent = binaryReader.ReadBytes((int)stream.Length);
}
}
protected async Task OnFilesUploading(FilesUploadingEventArgs args)
{
using (MemoryStream stream = new MemoryStream())
{
IFileInputSelectedFile file = args.Files[0];
await file.OpenReadStream(file.Size).CopyToAsync(stream);
DocumentContent = stream.ToArray();
await InvokeAsync(StateHasChanged);
}
}
private string GetPdfDataUrl()
{
if (DocumentContent == null || DocumentContent.Length == 0)
return string.Empty;
string base64 = Convert.ToBase64String(DocumentContent);
return $"data:application/pdf;base64,{base64}#toolbar=0&navpanes=0&scrollbar=1";
}
}