[英]mouse clickable backspace button in c#
我想在 windows 中为我的计算器应用程序制作一个退格按钮,问题是它删除了 cursor 右侧的字符,而不是左侧我该怎么办?
private void DeleteTextValue()
{
//if we don't have any value to delete, return
if (this.UserInput.Text.Length < this.UserInput.SelectionStart + 1)
return;
//remember cursor location
var selectionStart = this.UserInput.SelectionStart;
//delete the char to the right of the cursor
this.UserInput.Text = this.UserInput.Text.Remove(this.UserInput.Text.Length-1, 1);
//restore the cursor location
this.UserInput.SelectionStart = selectionStart;
//unhighlight the text
this.UserInput.SelectionStart = 0 ;
}
试试这个,我使用 substring 而不是删除。
private void DeleteTextValue()
{
//if we don't have any value to delete, return
if (this.UserInput.Text.Length < this.UserInput.SelectionStart + 1)
return;
//remember cursor location
var selectionStart = this.UserInput.SelectionStart;
//delete the char to the right of the cursor
//this.UserInput.Text = this.UserInput.Text.Remove(this.UserInput.Text.Length - 1, 1);
if (UserInput.SelectedText.Length > 0)
{
UserInput.Text = this.UserInput.Text.Substring(0, this.UserInput.SelectionStart) + "" + this.UserInput.Text.Substring(this.UserInput.SelectionStart + this.UserInput.SelectionLength);
selectionStart = selectionStart - this.UserInput.SelectionLength;
}
else
{
UserInput.Text = this.UserInput.Text.Substring(0, this.UserInput.SelectionStart - 1) + "" + this.UserInput.Text.Substring(this.UserInput.SelectionStart);
selectionStart = selectionStart - 1;
}
UserInput.Focus();
//restore the cursor location
this.UserInput.SelectionStart = selectionStart;
//unhighlight the text
this.UserInput.SelectionLength= 0;
}
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