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fix: Improve mouse wheel handling for high-resolution devices (#2346)

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This commit is contained in:
Garrett Holland
2026-05-07 13:55:46 +02:00
committed by GitHub
parent 17cc90efed
commit 54b6360ce9
1 changed files with 15 additions and 5 deletions
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Aga.Controls/Tree/TreeViewAdv.Input.cs
+15 -5
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@@ -116,15 +116,25 @@ namespace Aga.Controls.Tree
_search.EndSearch();
if (SystemInformation.MouseWheelScrollLines > 0)
{
int lines = e.Delta / 120 * SystemInformation.MouseWheelScrollLines;
int newValue = _vScrollBar.Value - lines;
newValue = Math.Min(_vScrollBar.Maximum - _vScrollBar.LargeChange + 1, newValue);
newValue = Math.Min(_vScrollBar.Maximum, newValue);
_vScrollBar.Value = Math.Max(_vScrollBar.Minimum, newValue);
// Accumulate sub-120 deltas from high-resolution precision trackpads.
// Classic scroll wheels always send multiples of 120; precision devices
// send smaller values (e.g. 15) that would integer-divide to zero.
_wheelDeltaRemainder += e.Delta;
int lines = _wheelDeltaRemainder / 120 * SystemInformation.MouseWheelScrollLines;
_wheelDeltaRemainder %= 120;
if (lines != 0)
{
int newValue = _vScrollBar.Value - lines;
newValue = Math.Min(_vScrollBar.Maximum - _vScrollBar.LargeChange + 1, newValue);
newValue = Math.Min(_vScrollBar.Maximum, newValue);
_vScrollBar.Value = Math.Max(_vScrollBar.Minimum, newValue);
}
}
base.OnMouseWheel(e);
}
private int _wheelDeltaRemainder;
protected override void OnMouseDown(MouseEventArgs e)
{
if (CurrentEditorOwner != null)