Question

我已经在C＃中进行了自定义控制，并且只要用户的光标悬停在自定义控件上，我就希望光标显示为“手”。我在哪里放置代码来做这样的事情？

????.Cursor = Cursors.Hand;

为了使鼠标悬停在此自定义控件上时显示手形光标？

namespace CustomRangeBar
{
    public partial class RangeBar : UserControl
    {
        public RangeBar()
        {
            InitializeComponent();
            label1.ForeColor = Color.Black;
            this.ForeColor = SystemColors.Highlight; // set the default color the rangeBar
            this.Click += new EventHandler(RangeBar_Click); 
        }

        protected float percent = 0.0f; // Protected because we don't want this to be accessed from the outside
        // Create a Value property for the rangeBar
        public float Value
        {
            get
            {
                return percent;
            }
            set
            {
                // Maintain the value between 0 and 100
                if (value < 0) value = 0;
                else if (value > 100) value = 100;
                percent = value;
                label1.Text = value.ToString();
                //redraw the rangeBar every time the value changes
                this.Invalidate();
            }
        }
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            Brush b = new SolidBrush(this.ForeColor); //create brush that will draw the background of the range bar
            // create a linear gradient that will be drawn over the background. FromArgb means you can use the Alpha value which is the transparency
            LinearGradientBrush lb = new LinearGradientBrush(new Rectangle(0, 0, this.Width, this.Height), Color.FromArgb(255, Color.White), Color.FromArgb(50, Color.White), LinearGradientMode.Vertical);

            // calculate how much has the rangeBar to be filled for 'x' %
            int width = (int)((percent / 100) * this.Width);
            e.Graphics.FillRectangle(b, 0, 0, width, this.Height);
            e.Graphics.FillRectangle(lb, 0, 0, width, this.Height);
            b.Dispose(); lb.Dispose();
        }

        private void RangeBar_SizeChanged(object sender, EventArgs e)
        {
            // maintain the label in the center of the rangeBar
            label1.Location = new Point(this.Width / 2 - 21 / 2 - 4, this.Height / 2 - 15 / 2);
        }

    }
}

public void RangeBar_Click(object obj, EventArgs ea)
{
    // This get executed if the pictureBox gets clicked
    label1.text = "Increment 1";
}

Answer 1

UserControl派生自Control，因此应该已经从该类继承了Cursor属性。在代码/属性中没有看到Cursor属性吗？

自定义控件使用光标手

1 个答案: