internal bool ActivateControlInternal(Control control, bool originator)
{
// Recursive function that makes sure that the chain of active controls
// is coherent.
bool ret = true;
bool updateContainerActiveControl = false;
ContainerControl cc = null;
Control parent = this.ParentInternal;
if (parent != null)
{
cc = (parent.GetContainerControlInternal()) as ContainerControl;
if (cc != null)
{
updateContainerActiveControl = (cc.ActiveControl != this);
}
}
if (control != activeControl || updateContainerActiveControl)
{
if (updateContainerActiveControl)
{
if (!cc.ActivateControlInternal(this, false))
{
return(false);
}
}
ret = AssignActiveControlInternal((control == this) ? null : control);
}
if (originator)
{
ScrollActiveControlIntoView();
}
return(ret);
}
/// <devdoc>
/// WM_SETFOCUS handler
/// </devdoc>
/// <internalonly/>
private void WmSetFocus(ref Message m)
{
if (!HostedInWin32DialogManager)
{
if (ActiveControl != null)
{
ImeSetFocus();
// REGISB: Do not raise GotFocus event since the focus
// is given to the visible ActiveControl
if (!ActiveControl.Visible)
{
OnGotFocus(EventArgs.Empty);
}
FocusActiveControlInternal();
}
else
{
if (ParentInternal != null)
{
IContainerControl c = ParentInternal.GetContainerControlInternal();
if (c != null)
{
bool succeeded = false;
ContainerControl knowncontainer = c as ContainerControl;
if (knowncontainer != null)
{
succeeded = knowncontainer.ActivateControlInternal(this);
}
else
{
// SECREVIEW : Taking focus and activating a control is response
// : to a user gesture (WM_SETFOCUS) is OK.
//
IntSecurity.ModifyFocus.Assert();
try {
succeeded = c.ActivateControl(this);
}
finally {
CodeAccessPermission.RevertAssert();
}
}
if (!succeeded)
{
return;
}
}
}
base.WndProc(ref m);
}
}
else
{
base.WndProc(ref m);
}
}
internal void SetActiveControlInternal(Control value)
{
if (activeControl != value || (value != null && !value.Focused))
{
if (value != null && !Contains(value))
{
throw new ArgumentException(SR.GetString(SR.CannotActivateControl));
}
bool ret;
ContainerControl cc = this;
if (value != null && value.ParentInternal != null)
{
cc = (value.ParentInternal.GetContainerControlInternal()) as ContainerControl;
}
if (cc != null)
{
// Call to the recursive function that corrects the chain
// of active controls
ret = cc.ActivateControlInternal(value, false);
}
else
{
ret = AssignActiveControlInternal(value);
}
if (cc != null && ret)
{
ContainerControl ccAncestor = this;
while (ccAncestor.ParentInternal != null &&
ccAncestor.ParentInternal.GetContainerControlInternal() is ContainerControl)
{
ccAncestor = ccAncestor.ParentInternal.GetContainerControlInternal() as ContainerControl;
Debug.Assert(ccAncestor != null);
}
if (ccAncestor.ContainsFocus &&
(value == null ||
!(value is UserControl) ||
(value is UserControl && !((UserControl)value).HasFocusableChild())))
{
cc.FocusActiveControlInternal();
}
}
}
}
