c# - 从仅系统托盘应用程序创建工具提示

Question

所以我尝试在屏幕上的某个位置创建工具提示。

ToolTip tip = new ToolTip();
tip.Show("foobar", **IWin32Window window**, new Point(100, 100))

问题是我不知道在上面的 window 参数中插入什么。我的应用程序完全在系统托盘外运行，没有其他 GUI 元素。它称为 notifyIcon1。这是通过 Form1 创建的。当插入 tip.Show() 时，这些值都不起作用。

如何仅使用系统托盘在屏幕上的任意位置生成工具提示？

谢谢。

Answer 1

IWin32Window 接口(interface)是一个简单的接口(interface)，它只提供一个名为Handle 的IntPtr 属性。像这样的事情应该可行:

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace SO_ToolTip
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        public static extern IntPtr GetDesktopWindow();

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            WindowWrapper windowWrapper = new WindowWrapper(GetDesktopWindow());
            ToolTip toolTip = new ToolTip();
            toolTip.Show("Blah blah... Blah blah... Blah blah...", windowWrapper, 1, 1, 10000);
        }
    }

    public class WindowWrapper : IWin32Window
    {
        public WindowWrapper(IntPtr handle)
        {
            Handle = handle;
        }

        public IntPtr Handle { get; protected set; }
    }
}

但事实并非如此。它提示 NullReferenceException，我没有进一步调试。这确实有效:

...
private void button1_Click(object sender, EventArgs e)
{
    ToolTip toolTip = new ToolTip();
    toolTip.Show("Blah blah... Blah blah... Blah blah...", this, 1, 1, 10000);
}
...

虽然位置是相对于当前表单的。也许这会让您朝着正确的方向前进。

编辑:即使这样也行不通，所以我不确定这是 WindowWrapper 的问题(如何？)还是什么:

...
private void button1_Click(object sender, EventArgs e)
{
    WindowWrapper windowWrapper = new WindowWrapper(this.Handle);
    ToolTip toolTip = new ToolTip();
    toolTip.Show("Blah blah... Blah blah... Blah blah...", windowWrapper, 1, 1, 10000);
}
...

---

给你，在显示 ToolTip

之前使用 BringToFront() 的透明最大化表单

Form1代码:

using System;
using System.Windows.Forms;

namespace SO_ToolTip
{
    public partial class Form1 : Form
    {
        Random _Random = new Random();
        ToolTip _ToolTip = new ToolTip();

        public Form1()
        {
            InitializeComponent();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            BringToFront();
            _ToolTip.Show("Blah blah... Blah blah... Blah blah...", this, _Random.Next(0, Width), _Random.Next(0, Height), 10000);
        }
    }
}

Form1 设计器代码:因此您可以看到表单属性:

namespace SO_ToolTip
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.SuspendLayout();
            // 
            // timer1
            // 
            this.timer1.Enabled = true;
            this.timer1.Interval = 1000;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 264);
            this.ControlBox = false;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "Form1";
            this.Opacity = 0;
            this.ShowIcon = false;
            this.ShowInTaskbar = false;
            this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Timer timer1;

    }
}