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Custom TabControl for Windows Forms with no borders by overriding TCM_ADJUSTRECT. Includes a helper to replace existing tab controls.
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| public partial class NoBorderTabControl : TabControl | |
| { | |
| /// <summary> | |
| /// Fine-tune adjustments to hide the border more precisely. | |
| /// </summary> | |
| public Padding BorderAdjustments { get; set; } = new() | |
| { | |
| Left = 6, | |
| Right = 6, | |
| Top = 2, | |
| Bottom = 6, | |
| }; | |
| [StructLayout(LayoutKind.Sequential)] | |
| public struct RECT | |
| { | |
| public int Left; | |
| public int Top; | |
| public int Right; | |
| public int Bottom; | |
| } | |
| private const string TAB_CONTROL_NAME = "TabControlAsNoBorder"; | |
| private const int TCM_FIRST = 0x1300; | |
| private const int TCM_ADJUSTRECT = TCM_FIRST + 40; | |
| protected override void WndProc(ref Message m) | |
| { | |
| if (m.Msg == TCM_ADJUSTRECT) | |
| { | |
| RECT rc = Marshal.PtrToStructure<RECT>(m.LParam); | |
| // Adjust these values depending on your needs | |
| rc.Left -= BorderAdjustments.Left; | |
| rc.Right += BorderAdjustments.Right; | |
| rc.Top -= BorderAdjustments.Top; | |
| rc.Bottom += BorderAdjustments.Bottom; | |
| Marshal.StructureToPtr(rc, m.LParam, true); | |
| } | |
| base.WndProc(ref m); | |
| } | |
| public static TabControl ReplaceTabControl(Control originalParent, TabControl originalTabControl) | |
| { | |
| if (!originalParent.Controls.ContainsKey(TAB_CONTROL_NAME)) | |
| { | |
| var newTabControl = new CustomTabControl | |
| { | |
| Name = TAB_CONTROL_NAME, | |
| Size = originalTabControl.Size, | |
| Width = originalTabControl.Width, | |
| Location = originalTabControl.Location, | |
| Dock = originalTabControl.Dock | |
| }; | |
| foreach (TabPage tabpage in originalTabControl.TabPages) | |
| { | |
| newTabControl.TabPages.Add(tabpage); | |
| } | |
| originalTabControl.Hide(); | |
| if (originalParent is TableLayoutPanel parentPanel) | |
| { | |
| int row = parentPanel.GetRow(originalTabControl); | |
| int column = parentPanel.GetColumn(originalTabControl); | |
| parentPanel.SetColumnSpan(newTabControl, parentPanel.GetColumnSpan(originalTabControl)); | |
| parentPanel.Controls.Add(newTabControl, column, row); | |
| } | |
| else | |
| { | |
| if (originalTabControl.Parent is null) | |
| { | |
| throw new InvalidOperationException("There is no parent of tab control here"); | |
| } | |
| originalTabControl.Parent.Controls.Add(newTabControl); | |
| } | |
| return newTabControl; | |
| } | |
| else | |
| { | |
| var controlNoBorder = originalParent.Controls[TAB_CONTROL_NAME]; | |
| if (controlNoBorder is TabControl) | |
| { | |
| return (TabControl)controlNoBorder; | |
| } | |
| else | |
| { | |
| throw new InvalidOperationException("There is no tab control in side of tab control parent children"); | |
| } | |
| } | |
| } | |
| } |
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