/// <include file='doc\TabControlDesigner.uex' path='docs/doc[@for="TabControlDesigner.GetHitTest"]/*' />
/// <devdoc>
/// Allows your component to support a design time user interface. A TabStrip
/// control, for example, has a design time user interface that allows the user
/// to click the tabs to change tabs. To implement this, TabStrip returns
/// true whenever the given point is within its tabs.
/// </devdoc>
protected override bool GetHitTest(Point point)
{
TabControl tc = ((TabControl)Control);
// tabControlSelected tells us if a tab page or the tab control itself is selected.
// If the tab control is selected, then we need to return true from here - so we can switch back and forth
// between tabs. If we're not currently selected, we want to select the tab control
// so return false.
if (tabControlSelected)
{
NativeMethods.TCHITTESTINFO tcInfo = new NativeMethods.TCHITTESTINFO();
tcInfo.pt = Control.PointToClient(point);;
UnsafeNativeMethods.SendMessage(Control.Handle, NativeMethods.TCM_HITTEST, 0, tcInfo);
return(tcInfo.flags != NativeMethods.TabControlHitTest.TCHT_NOWHERE);
}
return(false);
}
/// <summary>
/// Gets hot tab index.
/// </summary>
/// <returns>Index of the tab over that the mouse is hovering or -1 if the mouse isn't over any tab.</returns>
private unsafe int HitTest()
{
NativeMethods.TCHITTESTINFO hti = new NativeMethods.TCHITTESTINFO();
Point mousePos = this.PointToClient(TabControl.MousePosition);
hti.pt.x = mousePos.X; hti.pt.y = mousePos.Y;
return (int)NativeMethods.SendMessage(this.Handle, NativeMethods.TCM_HITTEST, IntPtr.Zero, (IntPtr)(&hti));
}
private TabPage TabUnderMouse()
{
NativeMethods.TCHITTESTINFO HTI = new NativeMethods.TCHITTESTINFO(tabControl.PointToClient(Cursor.Position));
int tabID = NativeMethods.SendMessage(tabControl.Handle, NativeMethods.TCM_HITTEST, IntPtr.Zero, ref HTI);
return tabID == -1 ? null : tabControl.TabPages[tabID];
}
/// <summary>
/// Gets hot tab index.
/// </summary>
/// <returns>Index of the tab over that the mouse is hovering or -1 if the mouse isn't over any tab.</returns>
private int HitTest()
{
NativeMethods.TCHITTESTINFO hti = new NativeMethods.TCHITTESTINFO();
Point mousePos = PointToClient(MousePosition);
hti.pt.x = mousePos.X;
hti.pt.y = mousePos.Y;
IntPtr htiPointer = Marshal.AllocCoTaskMem(Marshal.SizeOf(hti));
Marshal.StructureToPtr(hti, htiPointer, false);
int result = (int)NativeMethods.SendMessage(Handle, NativeMethods.TCM_HITTEST,
IntPtr.Zero, htiPointer);
Marshal.DestroyStructure(htiPointer, typeof(NativeMethods.TCHITTESTINFO));
Marshal.FreeCoTaskMem(htiPointer);
return result;
}
public static extern IntPtr SendMessage(IntPtr hwnd, int msg, int wparam, NativeMethods.TCHITTESTINFO lparam);
