Add Manual Zoom Support (#956)

Author: diegosyswork

blazorbootstrap/Components/PdfViewer/PdfViewer.razor.cs

@@ -59,6 +59,14 @@ protected override async Task OnParametersSetAsync()
         await base.OnParametersSetAsync();
     }
 
+    public async Task SetManualZoomPercentage(PdfViewerManualZoomPercentage manualZoomPercentage)
+    {
+        zoomLevel = (int)manualZoomPercentage;
+        var zp = GetZoomPercentage(zoomLevel);
+        zoomPercentage = $"{zp}%";
+        scale = 0.01 * zp;
+        await PdfViewerJsInterop.ZoomInOutAsync(objRef!, Id!, scale);
+    }
     [JSInvokable]
     public void DocumentLoaded(PdfViewerModel pdfViewerModel)
     {

blazorbootstrap/Enums/PdfViewerManualZoomPercentage.cs

@@ -0,0 +1,22 @@
+namespace BlazorBootstrap;
+
+public enum PdfViewerManualZoomPercentage
+{
+    x25Percent = 1,
+    x33Percent,
+    x50Percent,
+    x67Percent,
+    x75Percent,
+    x80Percent,
+    x90Percent,
+    x100Percent,
+    x110Percent,
+    x125Percent,
+    x150Percent,
+    x175Percent,
+    x200Percent,
+    x250Percent,
+    x300Percent,
+    x400Percent,
+    x500Percent
+}