From ebd1f5366739447e2d11ff94ecb840d81040c865 Mon Sep 17 00:00:00 2001 From: Lubomir Tetak Date: Fri, 22 Oct 2021 12:42:29 +0200 Subject: [PATCH] DataGrid minimum distance threshold when dragging headers --- .../DataGridColumnHeader.cs | 30 +++++++------------ 1 file changed, 11 insertions(+), 19 deletions(-) diff --git a/src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs b/src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs index 85fd55800a..915b36687c 100644 --- a/src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs +++ b/src/Avalonia.Controls.DataGrid/DataGridColumnHeader.cs @@ -35,6 +35,7 @@ namespace Avalonia.Controls private const int DATAGRIDCOLUMNHEADER_resizeRegionWidth = 5; private const double DATAGRIDCOLUMNHEADER_separatorThickness = 1; + private const int DATAGRIDCOLUMNHEADER_columnsDragTreshold = 5; private bool _areHandlersSuspended; private static DragMode _dragMode; @@ -448,19 +449,6 @@ namespace Avalonia.Controls OnMouseMove_Reorder(ref handled, mousePosition, mousePositionHeaders, distanceFromLeft, distanceFromRight); - // if we still haven't done anything about moving the mouse while - // the button is down, we remember that we're dragging, but we don't - // claim to have actually handled the event - if (_dragMode == DragMode.MouseDown) - { - _dragMode = DragMode.Drag; - } - - _lastMousePositionHeaders = mousePositionHeaders; - - if (args.Pointer.Captured != this && _dragMode == DragMode.Drag) - args.Pointer.Capture(this); - SetDragCursor(mousePosition); } @@ -732,15 +720,19 @@ namespace Avalonia.Controls { return; } - + //handle entry into reorder mode - if (_dragMode == DragMode.MouseDown && _dragColumn == null && (distanceFromRight > DATAGRIDCOLUMNHEADER_resizeRegionWidth && distanceFromLeft > DATAGRIDCOLUMNHEADER_resizeRegionWidth)) + if (_dragMode == DragMode.MouseDown && _dragColumn == null && _lastMousePositionHeaders != null && (distanceFromRight > DATAGRIDCOLUMNHEADER_resizeRegionWidth && distanceFromLeft > DATAGRIDCOLUMNHEADER_resizeRegionWidth)) { - handled = CanReorderColumn(OwningColumn); - - if (handled) + var distanceFromInitial = (Vector)(mousePositionHeaders - _lastMousePositionHeaders); + if (distanceFromInitial.Length > DATAGRIDCOLUMNHEADER_columnsDragTreshold) { - OnMouseMove_BeginReorder(mousePosition); + handled = CanReorderColumn(OwningColumn); + + if (handled) + { + OnMouseMove_BeginReorder(mousePosition); + } } }