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Fix #377: truncate long lines for better performance

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This commit is contained in:
Paddy Xu
2018-11-07 21:40:18 +02:00
parent 8e74040bb5
commit 7847a02840
1 changed files with 28 additions and 0 deletions
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28
QuickLook.Plugin/QuickLook.Plugin.TextViewer/TextViewerPanel.cs
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@@ -25,6 +25,7 @@ using System.Windows.Threading;
using ICSharpCode.AvalonEdit;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Highlighting;
using ICSharpCode.AvalonEdit.Rendering;
using QuickLook.Common.Helpers;
using QuickLook.Common.Plugin;
using UtfUnknown;
@@ -46,6 +47,8 @@ namespace QuickLook.Plugin.TextViewer
WordWrap = true;
IsReadOnly = true;
IsManipulationEnabled = true;
Options.EnableEmailHyperlinks = false;
Options.EnableHyperlinks = false;
ManipulationInertiaStarting += Viewer_ManipulationInertiaStarting;
ManipulationStarting += Viewer_ManipulationStarting;
@@ -55,6 +58,8 @@ namespace QuickLook.Plugin.TextViewer
FontFamily = new FontFamily(TranslationHelper.Get("Editor_FontFamily"));
TextArea.TextView.ElementGenerators.Add(new TruncateLongLines());
LoadFileAsync(path);
}
@@ -92,6 +97,29 @@ namespace QuickLook.Plugin.TextViewer
e.Mode = ManipulationModes.Translate;
}
private class TruncateLongLines : VisualLineElementGenerator
{
const int maxLength = 10000;
const string ellipsis = "……………";
public override int GetFirstInterestedOffset(int startOffset)
{
var line = CurrentContext.VisualLine.LastDocumentLine;
if (line.Length > maxLength)
{
int ellipsisOffset = line.Offset + maxLength - ellipsis.Length;
if (startOffset <= ellipsisOffset)
return ellipsisOffset;
}
return -1;
}
public override VisualLineElement ConstructElement(int offset)
{
return new FormattedTextElement(ellipsis, CurrentContext.VisualLine.LastDocumentLine.EndOffset - offset);
}
}
private void LoadFileAsync(string path)
{
Task.Run(() =>