Mirrors/PowerToys
1
0
Fork 0
mirror of https://github.com/microsoft/PowerToys.git synced 2025-12-16 19:57:57 +01:00
Code Issues Packages Projects Releases Wiki Activity

[FileExplorer Add-ons] If SVG file is bigger than 2MB save it as html page and preview the page (#18186)

Browse Source 
* If SVG file is bigger than 2MB save it as html page and navigate WebView2 to it

Reason: WebView2.NavigateToString() has 2MB string limitation

* Cleanup and add limitation link to comment

* Lower the limit after testing it
This commit is contained in:
Stefan Markovic
2022-05-15 22:35:15 +02:00
committed by GitHub
parent 3443c73d0e
commit 3548e6820e
2 changed files with 93 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
src/modules/previewpane/SvgThumbnailProvider/SvgThumbnailProvider.cs
View File

@@ -49,7 +49,7 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
/// <summary>
/// Name of the virtual host
/// </summary>
public const string VirtualHostName = "PowerToysLocalSvgThumbnail";
private const string VirtualHostName = "PowerToysLocalSvgThumbnail";
/// <summary>
/// Gets the path of the current assembly.
@@ -57,7 +57,7 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
/// <remarks>
/// Source: https://stackoverflow.com/a/283917/14774889
/// </remarks>
public static string AssemblyDirectory
private static string AssemblyDirectory
{
get
{
@@ -68,6 +68,12 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
}
}
/// <summary>
/// Represent WebView2 user data folder path.
/// </summary>
private string _webView2UserDataFolder = System.Environment.GetEnvironmentVariable("USERPROFILE") +
"\\AppData\\LocalLow\\Microsoft\\PowerToys\\SvgThumbnailPreview-Temp";
/// <summary>
/// Render SVG using WebView2 control, capture the WebView2
/// preview and create Bitmap out of it.
@@ -76,6 +82,8 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
/// <param name="cx">The maximum thumbnail size, in pixels.</param>
public Bitmap GetThumbnail(string content, uint cx)
{
CleanupWebView2UserDataFolder();
if (cx == 0 || cx > MaxThumbnailSize || string.IsNullOrEmpty(content) || !content.Contains("svg"))
{
return null;
@@ -117,8 +125,7 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
ConfiguredTaskAwaitable<CoreWebView2Environment>.ConfiguredTaskAwaiter
webView2EnvironmentAwaiter = CoreWebView2Environment
.CreateAsync(userDataFolder: System.Environment.GetEnvironmentVariable("USERPROFILE") +
"\\AppData\\LocalLow\\Microsoft\\PowerToys\\SvgThumbnailPreview-Temp")
.CreateAsync(userDataFolder: _webView2UserDataFolder)
.ConfigureAwait(true).GetAwaiter();
webView2EnvironmentAwaiter.OnCompleted(async () =>
{
@@ -129,9 +136,22 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
await _browser.CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync("window.addEventListener('contextmenu', window => {window.preventDefault();});");
_browser.CoreWebView2.SetVirtualHostNameToFolderMapping(VirtualHostName, AssemblyDirectory, CoreWebView2HostResourceAccessKind.Allow);
_browser.CoreWebView2.Settings.AreDefaultScriptDialogsEnabled = false;
_browser.NavigateToString(wrappedContent);
// WebView2.NavigateToString() limitation
// See https://docs.microsoft.com/en-us/dotnet/api/microsoft.web.webview2.core.corewebview2.navigatetostring?view=webview2-dotnet-1.0.864.35#remarks
// While testing the limit, it turned out it is ~1.5MB, so to be on a safe side we go for 1.5m bytes
if (wrappedContent.Length > 1_500_000)
{
string filename = _webView2UserDataFolder + "\\" + Guid.NewGuid().ToString() + ".html";
File.WriteAllText(filename, wrappedContent);
_browser.Source = new Uri(filename);
}
else
{
_browser.NavigateToString(wrappedContent);
}
}
catch (NullReferenceException)
catch (Exception)
{
}
});
@@ -249,5 +269,25 @@ namespace Microsoft.PowerToys.ThumbnailHandler.Svg
{
GC.SuppressFinalize(this);
}
/// <summary>
/// Cleanup the previously created tmp html files from svg files bigger than 2MB.
/// </summary>
private void CleanupWebView2UserDataFolder()
{
try
{
// Cleanup temp dir
var dir = new DirectoryInfo(_webView2UserDataFolder);
foreach (var file in dir.EnumerateFiles("*.html"))
{
file.Delete();
}
}
catch (Exception)
{
}
}
}
}