将Tab键顺序限制为单个用户控件

时间:2012-03-23 12:31:02

标签: c# .net winforms user-controls tab-ordering

我有一个用作浮动控件的用户控件,我想将Tab键顺序仅限于我的用户控件,当它可见时。基本上我需要的是一个控件,其行为类似于无边框Form。实际上它是Form,但我需要在MainForm窗口中保留Focus,所以我不得不将它更改为UserControl

所以,设想一个Form A(MainForm)和我的UserControl B.B是A的子控件。假设Form A有一个按钮和一个TextBox,而且控件B也是有一个按钮和一个文本框。目前发生的安全性如下

当前发生的事情(自然标签顺序行为):

当只有A可见时(B不可见):

1. The user manually focuses A textbox
2. Press tab key
3. A button is focused

当A可见且B可见时:(自然标签顺序键如下):

1. The user manually focuses B textbox
2. Press tab key
3. B button is focused
4. Press tab key
5. A textbox is focused
6. Press tab key
7. A button is focused

我需要什么(我需要更改用户控件以保留焦点):

我真正需要的是 B控件保留其中的Tab键顺序,所以当B控件可见时我需要的是:

1. The user manually focuses B texbox
2. Press tab key
3. B button is focused
4. Press tab key
5. B textbox is focused

4 个答案:

答案 0 :(得分:0)

您可以覆盖控件的KeyDown事件,并手动将焦点移动到应该获得焦点的控件上。

除此之外,我同意Will Hughes可能会打破导航......

答案 1 :(得分:0)

我假设您按下某个按钮可以切换B用户控件的可见性。如果它是可见的并具有焦点,那么它将保持焦点。只有当您将其切换为隐藏时,它才会失去焦点。如果是这种情况,您可以在A表单中尝试使用此代码,除非您隐藏用户控件,否则会将您的注意力集中在用户控件上:

// store when we last clicked the toggle B user control visibility
private Stopwatch _sinceLastMouseClick;

public Form1()
{
    InitializeComponent();
    // instantiate the stopwatch and start it ticking
    _sinceLastMouseClick = new Stopwatch();
    _sinceLastMouseClick.Start();
}

用于切换浮动B控件的单击处理程序上的可见性的按钮:

private void btnToggleBUserControlVisibility_Click(object sender, EventArgs e)
{
    // reset the stopwatch because we just clicked it
    _sinceLastMouseClick.Restart();
    myUserControl1.Visible = !myUserControl1.Visible;
}

在您的父A表单中,处理浮动用户控件的Leave事件:

private void myUserControl1_Leave(object sender, EventArgs e)
{
    // see if the mouse is over the toggle button
    Point ptMouse = System.Windows.Forms.Control.MousePosition;
    Point ptClient = this.PointToClient(ptMouse);
    // if the mouse is NOT hovering over the toggle button and has NOT just clicked it,
    // then keep the focus in the user control.
    // We use the stopwatch to make sure that not only are we hovering over the button
    // but that we also clicked it, too
    if (btnToggleBUserControlVisibility != this.GetChildAtPoint(ptClient) ||
        _sinceLastMouseClick.ElapsedMilliseconds > 100)
    {
        myUserControl1.Focus();
    }
}

答案 2 :(得分:0)

最后我解决了问题,包括父控件中的以下代码:

    private int WM_KEYDOWN = 0x100;

    public override bool PreProcessMessage(ref Message msg)
    {
        Keys key = (Keys)msg.WParam.ToInt32();

        if (msg.Msg == WM_KEYDOWN && key == Keys.Tab)
        {
            if (itemSearchControl.Visible)
            {
                bool moveForward = !IsShiftKeyPressed();
                bool result = itemSearchControl.SelectNextControl(itemSearchControl.ActiveControl, true, true, true, true);
                return true;
            }
        }

        return base.PreProcessMessage(ref msg);
    }

答案 3 :(得分:0)

从另一个问题,将其添加到您的UserControl xaml。

KeyboardNavigation.TabNavigation="Cycle"

Restrict tab order to a single user control (WPF)