travelExport/travelExport/Popover.cs

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace travelExport
{
    public partial class Popover : Form
    {

        private int triangleSize = 10; // 小三角的边长
        private int triangleOffset; // 小三角的水平偏移量（相对于弹出框）

        public Popover()
        {
            // 初始化弹出框样式
            this.FormBorderStyle = FormBorderStyle.None; // 无边框
            this.StartPosition = FormStartPosition.Manual; // 手动设置位置
            this.BackColor = Color.White; // 背景颜色
            this.Padding = new Padding(10); // 内边距
            this.ShowInTaskbar = false; // 不在任务栏显示
            this.Opacity = 0.95; // 设置透明度
            this.Size = new Size(300, 150); // 默认大小

            // 圆角边框设置
            this.Load += (s, e) => ApplyRoundedCorners();

            // 当弹出框失去焦点时关闭
            this.Deactivate += (s, e) => this.Close();

            // 添加内容
            Label label = new Label
            {
                Text = "这是一个带指向箭头的圆角弹出框",
                AutoSize = true,
                Dock = DockStyle.Top
            };

            Button button = new Button
            {
                Text = "确认",
                Dock = DockStyle.Bottom
            };
            button.Click += (s, e) => this.Close(); // 点击关闭弹出框

            this.Controls.Add(button);
            //this.Controls.Add(label);
        }

        // 圆角和三角指向处理
        private void ApplyRoundedCorners()
        {
            int cornerRadius = 20; // 圆角半径
            var path = new GraphicsPath();

            // 绘制上方圆角矩形
            path.AddArc(0, triangleSize, cornerRadius, cornerRadius, 180, 90);
            path.AddArc(this.Width - cornerRadius, triangleSize, cornerRadius, cornerRadius, 270, 90);
            path.AddArc(this.Width - cornerRadius, this.Height - cornerRadius, cornerRadius, cornerRadius, 0, 90);
            path.AddArc(0, this.Height - cornerRadius, cornerRadius, cornerRadius, 90, 90);
            path.CloseFigure();

            // 绘制小三角
            var triangle = new PointF[]
            {
            new PointF(triangleOffset - triangleSize / 2, triangleSize),
            new PointF(triangleOffset + triangleSize / 2, triangleSize),
            new PointF(triangleOffset, 0)
            };
            path.AddPolygon(triangle);

            this.Region = new Region(path);
        }

        // 根据目标控件的位置调整弹出框的位置
        public void AdjustPosition(Control target, int margin = 10)
        {
            var screenBounds = Screen.FromControl(target).WorkingArea;
            var targetBounds = target.RectangleToScreen(target.ClientRectangle);

            // 默认弹出框显示在控件下方
            var x = targetBounds.Left;
            var y = targetBounds.Bottom + margin;

            // 如果弹出框超出屏幕右侧，调整到控件右侧
            if (x + this.Width > screenBounds.Right)
            {
                x = screenBounds.Right - this.Width - margin;
            }

            // 如果弹出框超出屏幕下方，调整到控件上方
            if (y + this.Height > screenBounds.Bottom)
            {
                y = targetBounds.Top - this.Height - margin;
            }

            // 确保弹出框不会超出屏幕左侧或顶部
            x = Math.Max(x, screenBounds.Left + margin);
            y = Math.Max(y, screenBounds.Top + margin);

            this.Location = new Point(x, y);

            // 计算小三角的水平偏移量
            triangleOffset = targetBounds.Left + targetBounds.Width / 2 - x;
        }

    }
}