我希望做一个控制,从TextBox继承并具有一个标签在其内部大棒右侧的文本框中,哪些文本不是用户可编辑的,而是由一个属性设置。如何才能做到这一点?我意识到可能有很多原因,这UX是一个坏主意,但我必须这样做,这样一来。
I want to make a control which inherits from TextBox and which has a label inside which "sticks" to the right side of the text box and which text is not user-editable but rather is set by a property. How can this be done? I realize there may be many reasons why this UX is a bad idea, but I have to do it this way.
从汉斯帕桑特的按钮适应里面的WinForms文本框回答:
public class TextBoxWithLabel : TextBox {
[DllImport("user32.dll")]
private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);
Label label = new Label();
public TextBoxWithLabel() {
label.BackColor = Color.LightGray;
label.Cursor = Cursors.Default;
label.TextAlign = ContentAlignment.MiddleRight;
this.Controls.Add(label);
}
private int LabelWidth() {
return TextRenderer.MeasureText(label.Text, label.Font).Width;
}
public string LabelText {
get { return label.Text; }
set {
label.Text = value;
SendMessage(this.Handle, 0xd3, (IntPtr)2, (IntPtr)(LabelWidth() << 16));
OnResize(EventArgs.Empty);
}
}
protected override void OnResize(EventArgs e) {
base.OnResize(e);
int labelWidth = LabelWidth();
label.Left = this.ClientSize.Width - labelWidth;
label.Top = (this.ClientSize.Height / 2) - (label.Height / 2);
label.Width = labelWidth;
label.Height = this.ClientSize.Height;
}
}
结果: