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Tweak double buffer use in sample.

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This commit is contained in:
Eugene Wang 2023-04-07 21:20:57 -04:00
parent ebe277e614
commit 0a7ff8b140
2 changed files with 20 additions and 8 deletions
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6
samples/WinForm32/ControlExtensions.cs
View File

@ -10,12 +10,10 @@ namespace WinFormSample
{
static class ControlExtensions
{
public static void SetDoubleBuffered(this Control control, bool value)
public static void SetDoubleBufferedAsNeeded(this Control control)
{
if (SystemInformation.TerminalServerSession) return;
var dbprop = control.GetType().GetProperty("DoubleBuffered", BindingFlags.NonPublic | BindingFlags.Instance);
dbprop!.SetValue(control, value);
dbprop!.SetValue(control, !SystemInformation.TerminalServerSession);
}
}

22
samples/WinForm32/Form1.cs
View File

@ -1,3 +1,4 @@
using Microsoft.Win32;
using NTwain;
using NTwain.Data;
using System;
@ -34,7 +35,8 @@ namespace WinFormSample
twain.TransferError += Twain_TransferError;
twain.DeviceEvent += Twain_DeviceEvent;
capListView.SetDoubleBuffered(true);
capListView.SetDoubleBufferedAsNeeded();
SystemEvents.SessionSwitch += SystemEvents_SessionSwitch;
saveFolder = Path.Combine(Path.GetTempPath(), "ntwain-sample");
Directory.CreateDirectory(saveFolder);
@ -42,6 +44,18 @@ namespace WinFormSample
this.Disposed += Form1_Disposed;
}
private void SystemEvents_SessionSwitch(object sender, SessionSwitchEventArgs e)
{
switch (e.Reason)
{
case SessionSwitchReason.RemoteConnect:
case SessionSwitchReason.SessionUnlock:
case SessionSwitchReason.SessionLogon:
capListView.SetDoubleBufferedAsNeeded();
break;
}
}
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
@ -88,7 +102,7 @@ namespace WinFormSample
private void Twain_DataTransferred(TwainAppSession sender, DataTransferredEventArgs e)
{
Debug.WriteLine($"[thread {Environment.CurrentManagedThreadId}] data transferred with info {e.ImageInfo}");
Debug.WriteLine($"[thread {Environment.CurrentManagedThreadId}] data transferred with info {e.GetImageInfo()}");
if (e.Data == null) return;
using (var stream = new MemoryStream(e.Data))
using (var img = Image.FromStream(stream))
@ -116,7 +130,7 @@ namespace WinFormSample
private void Twain_CurrentSourceChanged(TwainAppSession sender, TW_IDENTITY_LEGACY ds)
{
lblCurrent.Text = ds.ProductName;
lblCurrent.Text = ds.ToString();
if (twain.State == STATE.S4)
{
LoadCapInfoList();
@ -291,7 +305,7 @@ namespace WinFormSample
private void btnStart_Click(object sender, EventArgs e)
{
twain.EnableSource(true, false);
twain.EnableSource(false, false);
}
}
}