.net cf在焦点上显示键盘的TextBox

Question

我的UI上有一些文本框，我想在控件有焦点时显示移动键盘，然后消失。

注意：对于此特定程序，它是一个高屏幕，设备上没有物理键盘。

Answer 1

将InputPanel添加到表单，连接TextBox的GotFocus和LostFocus事件，并在事件处理程序中显示/隐藏输入面板：

private void TextBox_GotFocus(object sender, EventArgs e)
{
    SetKeyboardVisible(true);
}

private void TextBox_LostFocus(object sender, EventArgs e)
{
    SetKeyboardVisible(false);
}

protected void SetKeyboardVisible(bool isVisible)
{
    inputPanel.Enabled = isVisible;
}

更新

回应ctacke的完整性要求; 这是连接事件处理程序的示例代码。 通常我会使用设计器（选择文本框，显示属性网格，切换到事件列表并为GotFocus和LostFocus设置环境），但如果UI包含多个文本框，您可能希望让它更自动化。

下面的类公开了两个静态方法，AttachGotLostFocusEvents和DetachGotLostFocusEvents; 他们接受ControlCollection和两个事件处理程序。

internal static class ControlHelper
{
    private static bool IsGotLostFocusControl(Control ctl)
    {
        return ctl.GetType().IsSubclassOf(typeof(TextBoxBase)) ||
           (ctl.GetType() == typeof(ComboBox) && (ctl as ComboBox).DropDownStyle == ComboBoxStyle.DropDown);
    }

    public static void AttachGotLostFocusEvents(
        System.Windows.Forms.Control.ControlCollection controls,
        EventHandler gotFocusEventHandler,
        EventHandler lostFocusEventHandler)
    {
        foreach (Control ctl in controls)
        {
            if (IsGotLostFocusControl(ctl))
            {
                ctl.GotFocus += gotFocusEventHandler;
                ctl.LostFocus += lostFocusEventHandler ;
            }
            else if (ctl.Controls.Count > 0)
            {
                AttachGotLostFocusEvents(ctl.Controls, gotFocusEventHandler, lostFocusEventHandler);
            }
        }
    }

    public static void DetachGotLostFocusEvents(
        System.Windows.Forms.Control.ControlCollection controls,
        EventHandler gotFocusEventHandler,
        EventHandler lostFocusEventHandler)
    {
        foreach (Control ctl in controls)
        {
            if (IsGotLostFocusControl(ctl))
            {
                ctl.GotFocus -= gotFocusEventHandler;
                ctl.LostFocus -= lostFocusEventHandler;
            }
            else if (ctl.Controls.Count > 0)
            {
                DetachGotLostFocusEvents(ctl.Controls, gotFocusEventHandler, lostFocusEventHandler);
            }
        }
    }
}

表单中的用法示例：

private void Form_Load(object sender, EventArgs e)
{
    ControlHelper.AttachGotLostFocusEvents(
        this.Controls,
        new EventHandler(EditControl_GotFocus),
        new EventHandler(EditControl_LostFocus));
}

private void Form_Closed(object sender, EventArgs e)
{
    ControlHelper.DetachGotLostFocusEvents(
        this.Controls,
        new EventHandler(EditControl_GotFocus),
        new EventHandler(EditControl_LostFocus));
}

private void EditControl_GotFocus(object sender, EventArgs e)
{
    ShowKeyboard();
}

private void EditControl_LostFocus(object sender, EventArgs e)
{
    HideKeyboard();
}

Answer 2

使用InputPanel类 。 在获得焦点时启用它，在失去焦点时禁用它。