public ChildElementForm(bool Fixed)
{
//Tabbing forward through a form with an element host as its only control
//will result in tabbing through to the next MDI child instead
//of rotating around.
//Tabbing backward is seemingly uneffected.
//The quick fix adds a hidden focusable control behind it that redirects
//back to the element host.
//The internal HwndSource is reflected out in order to call
//IKeyboardInputSink.TabInto()
if (Fixed)
{
var ElementHost = new FormElementHost();
ElementHost.Dock = DockStyle.Fill;
ElementHost.Child = new ChildElementControl();
ElementHost.TabIndex = 0;
this.Controls.Add(ElementHost);
var Panel = new TextBox();
Panel.TabIndex = 1;
Panel.GotFocus += (s, e) =>
{
ElementHost.TabInto();
};
this.Controls.Add(Panel);
this.Text = "ChildElementForm Fixed";
}
else
{
var ElementHost = new ElementHost();
ElementHost.Dock = DockStyle.Fill;
ElementHost.Child = new ChildElementControl();
ElementHost.TabIndex = 0;
this.Controls.Add(ElementHost);
this.Text = "ChildElementForm Broke";
}
}
public ChildElementForm(bool Fixed)
{
//Tabbing forward through a form with an element host as its only control
//will result in tabbing through to the next MDI child instead
//of rotating around.
//Tabbing backward is seemingly uneffected.
//The quick fix adds a hidden focusable control behind it that redirects
//back to the element host.
//The internal HwndSource is reflected out in order to call
//IKeyboardInputSink.TabInto()
if (Fixed)
{
var ElementHost = new FormElementHost();
ElementHost.Dock = DockStyle.Fill;
ElementHost.Child = new ChildElementControl();
ElementHost.TabIndex = 0;
this.Controls.Add(ElementHost);
var Panel = new TextBox();
Panel.TabIndex = 1;
Panel.GotFocus += (s, e) =>
{
ElementHost.TabInto();
};
this.Controls.Add(Panel);
this.Text = "ChildElementForm Fixed";
}
else
{
var ElementHost = new ElementHost();
ElementHost.Dock = DockStyle.Fill;
ElementHost.Child = new ChildElementControl();
ElementHost.TabIndex = 0;
this.Controls.Add(ElementHost);
this.Text = "ChildElementForm Broke";
}
}