.net cf在焦點上顯示鍵盤的TextBox

Question

我的UI上有一些文本框，我想在控件有焦點時顯示移動鍵盤，然后消失。

注意：對於此特定程序，它是一個高屏幕，設備上沒有物理鍵盤。

Answer 1

將InputPanel添加到表單，連接TextBox的GotFocus和LostFocus事件，並在事件處理程序中顯示/隱藏輸入面板：

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

回應ctacke的完整性要求; 這是連接事件處理程序的示例代碼。 通常我會使用設計器（選擇文本框，顯示屬性網格，切換到事件列表並為GotFocus和LostFocus設置環境），但如果UI包含多個文本框，您可能希望讓它更自動化。

下面的類公開了兩個靜態方法，AttachGotLostFocusEvents和DetachGotLostFocusEvents; 他們接受ControlCollection和兩個事件處理程序。

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);
            }
        }
    }
}

表單中的用法示例：

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類 。 在獲得焦點時啟用它，在失去焦點時禁用它。