当文本框在ToolStripDropDown编辑时鼠标光标消失

本文关键字：鼠标 光标 消失 编辑 ToolStripDropDown 文本 | 更新日期: 2023-09-27 18:06:48

我有一个用户控件与RichTextBox和两个按钮。我试图在ToolStripDropDown上显示在ToolStripButton点击。我使用ToolStripControlHost把我的控制在ToolStripDrowDown。当我在表单工具栏上单击ToolStripButton时，我在某些位置显示下拉，并将焦点放在ToolStripControlHost控件上。鼠标指针停留在ToolStripButton上方，光标位于RichTextBox。但是，当我开始编辑RichTextBox鼠标指针消失，我可以看到它只有当它的形式矩形。我该怎么修理它?

下面是我的代码: 
private void toolBtnNote_Click(object sender, EventArgs e)
{
   dropDownClosed = false;
   noteChanged = false;
   tsdd = new ToolStripDropDown();
   this.tsdd.Opened += new EventHandler(tsdd_Opened);
   this.tsdd.AutoSize = true;
   NoteEdit ne = new NoteEdit();
   ne.NoteText = note ?? "";
   // appears when user clicks first button at my control
   ne.OkClick += new NoteEdit.NoteEditEvent(ne_OkClick);
   // appears when user clicks second button at my control
   ne.CancelClick += new NoteEdit.NoteEditEvent(ne_CancelClick);
   this.tbh = new ToolStripControlHost(ne, "noteEdit");
   this.tbh.Padding = new Padding(0);
   this.tbh.AutoSize = false;
   this.tbh.Size = ne.Size;
   this.tsdd.Items.Add(tbh);
   this.tsdd.Padding = new Padding(0);
   this.tsdd.Closing += new ToolStripDropDownClosingEventHandler(tsdd_Closing);
   // show toolstripdrowdown at specific position at DataGridView         
   this.tsdd.Show(dgvMarks, cellRect.Location + new Size(0, cellRect.Height));
   while (!this.dropDownClosed)
   {
       Application.DoEvents();
   }
   if(noteChanged) {...}
}
void ne_CancelClick()
{
    tsdd.Close();
}
void ne_OkClick()
{
    noteChanged = true;
    tsdd.Close();
}
void tsdd_Opened(object sender, EventArgs e)
{
    tbh.Focus();
}
void tsdd_Closing(object sender, ToolStripDropDownClosingEventArgs e)
{
    dropDownClosed = true;
}

当文本框在ToolStripDropDown编辑时鼠标光标消失

当您开始编辑TextBox或RichTextBox时，鼠标光标隐藏是正常的行为。当你移动鼠标时，它应该会恢复。您还应该注意调用Cursor。如果你试图在TextChanged或类似的东西中调用Show，它将没有效果。

我找到了解决方案。不是最好的，但很有效。我只是用WinApi模拟点击显示的RichTextBox:

public class WinApiHelper
{
    private const UInt32 MOUSEEVENTF_LEFTDOWN = 0x0002;
    private const UInt32 MOUSEEVENTF_LEFTUP = 0x0004;
    [DllImport("user32.dll")]
    private static extern void mouse_event(
        UInt32 dwFlags, // motion and click options
        UInt32 dx, // horizontal position or change
        UInt32 dy, // vertical position or change
        UInt32 dwData, // wheel movement
        IntPtr dwExtraInfo // application-defined information
        );
    public static void SendClick(Point location)
    {
        Cursor.Position = location;
        mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, new System.IntPtr());
        mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, new System.IntPtr());
    }     
}
private void toolBtnNote_Click(object sender, EventArgs e)
{
        dropDownClosed = false;
        noteChanged = false;
        dgvMarks.Focus();
        tsdd = new ToolStripDropDown();
        this.tsdd.Opened += new EventHandler(tsdd_Opened);
        this.tsdd.AutoSize = true;
        NoteEdit ne = new NoteEdit();
        ne.NoteText = note ?? "";
        ne.OkClick += new NoteEdit.NoteEditEvent(ne_OkClick);
        ne.CancelClick += new NoteEdit.NoteEditEvent(ne_CancelClick);
        this.tbh = new ToolStripControlHost(ne, "noteEdit");
        this.tbh.Padding = new Padding(0);
        this.tbh.AutoSize = false;
        this.tbh.Size = ne.Size;
        this.tsdd.Items.Add(tbh);
        this.tsdd.Padding = new Padding(0);
        this.tsdd.Closing += new ToolStripDropDownClosingEventHandler(tsdd_Closing);
        this.tsdd.Show(dgvMarks, cellRect.Location + new Size(0, cellRect.Height));
        // emulate click on richtextbox at dropdown 
        WinApiHelper.SendClick(tsdd.Location + new Size(ne.Rtb.Location) + new Size(5, 5));
        while (!this.dropDownClosed)
        {
            Application.DoEvents();
        }
        if (noteChanged)
        {...}
 }
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