[英]How to set TextBox cursor position without SelectionStart
I have a Windows Forms textbox with background thread updating its value every second. 我有一个Windows窗体文本框,后台线程每秒更新其值。 If I place cursor inside textbox it will loose its current position at next update.
如果我将光标放在文本框中,它将在下次更新时松开其当前位置。 Same thing with text selection.
文本选择也是如此。
I tried to solve it like that 我试着像那样解决它
protected void SetTextProgrammatically(string value)
{
// save current cursor position and selection
int start = textBox.SelectionStart;
int length = textBox.SelectionLength;
// update text
textBox.Text = value;
// restore cursor position and selection
textBox.SelectionStart = start;
textBox.SelectionLength = length;
}
It works good most of the time. 它大部分时间都很好用。 Here is situation when it does not work:
这是不起作用的情况:
1) I place cursor at the end of the text in textbox 1)我将光标放在文本框中文本的末尾
2) press SHIFT and move cursor to the left using <- arrow key 2)按SHIFT键并使用< - 箭头键将光标向左移动
Selection won't work properly. 选择将无法正常工作。
It looks like combination SelectionStart=10
and SelectionLength=1
automatically moves cursor to position 11 (not 10 as I want it to be). 它看起来像组合
SelectionStart=10
和SelectionLength=1
自动将光标移动到位置11(不是10,因为我希望它)。
Please let me know if there is anything I can do about it! 如果有什么我可以做的话,请告诉我! I am using Framework.NET 2.0.
我正在使用Framework.NET 2.0。
There must be a way to set cursor position in textbox other then SelectionStart+SelectionLength
. 必须有一种方法在文本框中设置光标位置,然后
SelectionStart+SelectionLength
。
//save position
bool focused = textBox1.Focused;
int start = textBox1.SelectionStart;
int len = textBox1.SelectionLength;
//do your work
textBox1.Text = "duviubobioub";
//restore
textBox1.SelectionStart = start;
textBox1.SelectionLength = len ;
textBox1.Select();
I have found the solution! 我找到了解决方案!
// save current cursor position and selection
int start = textBox.SelectionStart;
int length = textBox.SelectionLength;
Point point = new Point();
User32.GetCaretPos(out point);
// update text
textBox.Text = value;
// restore cursor position and selection
textBox.Select(start, length);
User32.SetCaretPos(point.X, point.Y);
Now its working just like it should. 现在它的工作就像它应该的那样。
To set the cursor position in textbox without selection start...! 要在文本框中设置光标位置而不选择开始......!
textbox1.Select(textbox1.text.length,0); /* ===> End of the textbox */
textbox1.Select(0,0); /* ===> Start of the textbox */
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