（十九）c#Winform自定义控件-停靠窗体

前提

入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。

GitHub：https://github.com/kwwwvagaa/NetWinformControl

码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git

如果觉得写的还行，请点个 star 支持一下吧

欢迎前来交流探讨： 企鹅群568015492 

目录

https://www.cnblogs.com/bfyx/p/11364884.html

准备工作

这是一个可停靠在指定位置或停靠在某个控件旁边的无焦点窗体，市区焦点会关闭

开始

添加一个Form，命名为FrmAnchor，实现接口IMessageFilter

有2个构造函数

 1    #region 构造函数
 2         /// 

 3         /// 功能描述:构造函数
 4         /// 作　　者:HZH
 5         /// 创建日期:2019-02-27 11:49:08
 6         /// 任务编号:POS
 7         /// 
 8         /// 父控件
 9         /// 子控件
10         /// 偏移
11         public FrmAnchor(Control parentControl, Control childControl, Point? deviation = null)
12         {
13             m_parentControl = parentControl;
14             InitializeComponent();
15             this.Size = childControl.Size;
16             this.HandleCreated += FrmDownBoard_HandleCreated;
17             this.HandleDestroyed += FrmDownBoard_HandleDestroyed;
18             this.Controls.Add(childControl);
19             childControl.Dock = DockStyle.Fill;
20             Point p = parentControl.Parent.PointToScreen(parentControl.Location);
21             int intX = 0;
22             int intY = 0;
23             if (p.Y + parentControl.Height + childControl.Height > Screen.PrimaryScreen.Bounds.Height)
24             {
25                 intY = p.Y - childControl.Height - 1;
26                 blnDown = false;
27             }
28             else
29             {
30                 intY = p.Y + parentControl.Height + 1;
31                 blnDown = true;
32             }
33 
34             if (p.X + childControl.Width > Screen.PrimaryScreen.Bounds.Width)
35             {
36                 intX = Screen.PrimaryScreen.Bounds.Width - childControl.Width;
37 
38             }
39             else
40             {
41                 intX = p.X;
42             }
43             if (deviation.HasValue)
44             {
45                 intX += deviation.Value.X;
46                 intY += deviation.Value.Y;
47             }
48             this.Location = new Point(intX, intY);
49         }
50 
51         public FrmAnchor(Control parentControl, Size size, Point? deviation = null)
52         {
53             m_parentControl = parentControl;
54             InitializeComponent();
55             this.Size = size;
56             this.HandleCreated += FrmDownBoard_HandleCreated;
57             this.HandleDestroyed += FrmDownBoard_HandleDestroyed;
58 
59             Point p = parentControl.Parent.PointToScreen(parentControl.Location);
60             int intX = 0;
61             int intY = 0;
62             if (p.Y + parentControl.Height + size.Height > Screen.PrimaryScreen.Bounds.Height)
63             {
64                 intY = p.Y - size.Height - 1;
65                 blnDown = false;
66             }
67             else
68             {
69                 intY = p.Y + parentControl.Height + 1;
70                 blnDown = true;
71             }
72 
73             if (p.X + size.Width > Screen.PrimaryScreen.Bounds.Width)
74             {
75                 intX = Screen.PrimaryScreen.Bounds.Width - size.Width;
76 
77             }
78             else
79             {
80                 intX = p.X;
81             }
82             if (deviation.HasValue)
83             {
84                 intX += deviation.Value.X;
85                 intY += deviation.Value.Y;
86             }
87             this.Location = new Point(intX, intY);
88         }
89 
90         #endregion

消息筛选器处理一下

private void FrmDownBoard_HandleDestroyed(object sender, EventArgs e)
        {
            Application.RemoveMessageFilter(this);
        }

        private void FrmDownBoard_HandleCreated(object sender, EventArgs e)
        {
            Application.AddMessageFilter(this);
        }

 public bool PreFilterMessage(ref Message m)
        {
            if (m.Msg != 0x0201 || this.Visible == false)
                return false;
            var pt = this.PointToClient(MousePosition);
            this.Visible = this.ClientRectangle.Contains(pt);
            return false;
        }

无焦点处理

 1   #region 无焦点窗体
 2 
 3         [System.Runtime.InteropServices.DllImport("user32.dll")]
 4         private extern static IntPtr SetActiveWindow(IntPtr handle);
 5         private const int WM_ACTIVATE = 0x006;
 6         private const int WM_ACTIVATEAPP = 0x01C;
 7         private const int WM_NCACTIVATE = 0x086;
 8         private const int WA_INACTIVE = 0;
 9         private const int WM_MOUSEACTIVATE = 0x21;
10         private const int MA_NOACTIVATE = 3;
11         protected override void WndProc(ref Message m)
12         {
13             if (m.Msg == WM_MOUSEACTIVATE)
14             {
15                 m.Result = new IntPtr(MA_NOACTIVATE);
16                 return;
17             }
18             else if (m.Msg == WM_NCACTIVATE)
19             {
20                 if (((int)m.WParam & 0xFFFF) != WA_INACTIVE)
21                 {
22                     if (m.LParam != IntPtr.Zero)
23                     {
24                         SetActiveWindow(m.LParam);
25                     }
26                     else
27                     {
28                         SetActiveWindow(IntPtr.Zero);
29                     }
30                 }
31             }
32             base.WndProc(ref m);
33         }
34 
35         #endregion

 1    private void timer1_Tick(object sender, EventArgs e)
 2         {
 3             if (this.Owner != null)
 4             {
 5                 Form frm = this.Owner as Form;
 6                 IntPtr _ptr = ControlHelper.GetForegroundWindow();
 7                 if (_ptr != frm.Handle)
 8                 {
 9                     this.Hide();
10                 }
11             }
12         }

显示和关闭动画

 1 private void FrmAnchor_VisibleChanged(object sender, EventArgs e)
 2         {
 3             timer1.Enabled = this.Visible;
 4             if (Visible)
 5             {
 6                 if (blnDown)
 7                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_POSITIVE);
 8                 else
 9                 {
10                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_NEGATIVE);
11                 }
12             }
13             else
14             {
15                 if (blnDown)
16                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_NEGATIVE | ControlHelper.AW_HIDE);
17                 else
18                 {
19                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_POSITIVE | ControlHelper.AW_HIDE);
20 
21                 }
22             }
23         }

再看一下完整代码

  1 // 版权所有  黄正辉  交流群：568015492   QQ：623128629
  2 // 文件名称：FrmAnchor.cs
  3 // 创建日期：2019-08-15 16:04:24
  4 // 功能描述：FrmAnchor
  5 // 项目地址：https://gitee.com/kwwwvagaa/net_winform_custom_control
  6 
  7 using System;
  8 using System.Collections.Generic;
  9 using System.ComponentModel;
 10 using System.Data;
 11 using System.Drawing;
 12 using System.Linq;
 13 using System.Text;
 14 using System.Windows.Forms;
 15 
 16 namespace HZH_Controls.Forms
 17 {
 18     /// 

 19     /// 功能描述:停靠窗体
 20     /// 作　　者:HZH
 21     /// 创建日期:2019-02-27 11:49:03
 22     /// 任务编号:POS
 23     /// 
 24     public partial class FrmAnchor : Form, IMessageFilter
 25     {
 26         Control m_parentControl = null;
 27         private bool blnDown = true;
 28         #region 构造函数
 29         /// 

 30         /// 功能描述:构造函数
 31         /// 作　　者:HZH
 32         /// 创建日期:2019-02-27 11:49:08
 33         /// 任务编号:POS
 34         /// 
 35         /// 父控件
 36         /// 子控件
 37         /// 偏移
 38         public FrmAnchor(Control parentControl, Control childControl, Point? deviation = null)
 39         {
 40             m_parentControl = parentControl;
 41             InitializeComponent();
 42             this.Size = childControl.Size;
 43             this.HandleCreated += FrmDownBoard_HandleCreated;
 44             this.HandleDestroyed += FrmDownBoard_HandleDestroyed;
 45             this.Controls.Add(childControl);
 46             childControl.Dock = DockStyle.Fill;
 47             Point p = parentControl.Parent.PointToScreen(parentControl.Location);
 48             int intX = 0;
 49             int intY = 0;
 50             if (p.Y + parentControl.Height + childControl.Height > Screen.PrimaryScreen.Bounds.Height)
 51             {
 52                 intY = p.Y - childControl.Height - 1;
 53                 blnDown = false;
 54             }
 55             else
 56             {
 57                 intY = p.Y + parentControl.Height + 1;
 58                 blnDown = true;
 59             }
 60 
 61             if (p.X + childControl.Width > Screen.PrimaryScreen.Bounds.Width)
 62             {
 63                 intX = Screen.PrimaryScreen.Bounds.Width - childControl.Width;
 64 
 65             }
 66             else
 67             {
 68                 intX = p.X;
 69             }
 70             if (deviation.HasValue)
 71             {
 72                 intX += deviation.Value.X;
 73                 intY += deviation.Value.Y;
 74             }
 75             this.Location = new Point(intX, intY);
 76         }
 77 
 78         public FrmAnchor(Control parentControl, Size size, Point? deviation = null)
 79         {
 80             m_parentControl = parentControl;
 81             InitializeComponent();
 82             this.Size = size;
 83             this.HandleCreated += FrmDownBoard_HandleCreated;
 84             this.HandleDestroyed += FrmDownBoard_HandleDestroyed;
 85 
 86             Point p = parentControl.Parent.PointToScreen(parentControl.Location);
 87             int intX = 0;
 88             int intY = 0;
 89             if (p.Y + parentControl.Height + size.Height > Screen.PrimaryScreen.Bounds.Height)
 90             {
 91                 intY = p.Y - size.Height - 1;
 92                 blnDown = false;
 93             }
 94             else
 95             {
 96                 intY = p.Y + parentControl.Height + 1;
 97                 blnDown = true;
 98             }
 99 
100             if (p.X + size.Width > Screen.PrimaryScreen.Bounds.Width)
101             {
102                 intX = Screen.PrimaryScreen.Bounds.Width - size.Width;
103 
104             }
105             else
106             {
107                 intX = p.X;
108             }
109             if (deviation.HasValue)
110             {
111                 intX += deviation.Value.X;
112                 intY += deviation.Value.Y;
113             }
114             this.Location = new Point(intX, intY);
115         }
116 
117         #endregion
118 
119         private void FrmDownBoard_HandleDestroyed(object sender, EventArgs e)
120         {
121             Application.RemoveMessageFilter(this);
122         }
123 
124         private void FrmDownBoard_HandleCreated(object sender, EventArgs e)
125         {
126             Application.AddMessageFilter(this);
127         }
128 
129         #region 无焦点窗体
130 
131         [System.Runtime.InteropServices.DllImport("user32.dll")]
132         private extern static IntPtr SetActiveWindow(IntPtr handle);
133         private const int WM_ACTIVATE = 0x006;
134         private const int WM_ACTIVATEAPP = 0x01C;
135         private const int WM_NCACTIVATE = 0x086;
136         private const int WA_INACTIVE = 0;
137         private const int WM_MOUSEACTIVATE = 0x21;
138         private const int MA_NOACTIVATE = 3;
139         protected override void WndProc(ref Message m)
140         {
141             if (m.Msg == WM_MOUSEACTIVATE)
142             {
143                 m.Result = new IntPtr(MA_NOACTIVATE);
144                 return;
145             }
146             else if (m.Msg == WM_NCACTIVATE)
147             {
148                 if (((int)m.WParam & 0xFFFF) != WA_INACTIVE)
149                 {
150                     if (m.LParam != IntPtr.Zero)
151                     {
152                         SetActiveWindow(m.LParam);
153                     }
154                     else
155                     {
156                         SetActiveWindow(IntPtr.Zero);
157                     }
158                 }
159             }
160             base.WndProc(ref m);
161         }
162 
163         #endregion
164 
165         public bool PreFilterMessage(ref Message m)
166         {
167             if (m.Msg != 0x0201 || this.Visible == false)
168                 return false;
169             var pt = this.PointToClient(MousePosition);
170             this.Visible = this.ClientRectangle.Contains(pt);
171             return false;
172         }
173 
174         private void FrmAnchor_Load(object sender, EventArgs e)
175         {
176 
177         }
178 
179 
180         private void FrmAnchor_VisibleChanged(object sender, EventArgs e)
181         {
182             timer1.Enabled = this.Visible;
183             if (Visible)
184             {
185                 if (blnDown)
186                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_POSITIVE);
187                 else
188                 {
189                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_NEGATIVE);
190                 }
191             }
192             else
193             {
194                 if (blnDown)
195                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_NEGATIVE | ControlHelper.AW_HIDE);
196                 else
197                 {
198                     ControlHelper.AnimateWindow(this.Handle, 100, ControlHelper.AW_VER_POSITIVE | ControlHelper.AW_HIDE);
199 
200                 }
201             }
202         }
203 
204         private void timer1_Tick(object sender, EventArgs e)
205         {
206             if (this.Owner != null)
207             {
208                 Form frm = this.Owner as Form;
209                 IntPtr _ptr = ControlHelper.GetForegroundWindow();
210                 if (_ptr != frm.Handle)
211                 {
212                     this.Hide();
213                 }
214             }
215         }
216 
217     }
218 }

View Code

 1 namespace HZH_Controls.Forms
 2 {
 3     partial class FrmAnchor
 4     {
 5         /// 

 6         /// Required designer variable.
 7         /// 
 8         private System.ComponentModel.IContainer components = null;
 9 
10         /// 

11         /// Clean up any resources being used.
12         /// 
13         /// true if managed resources should be disposed; otherwise, false.
14         protected override void Dispose(bool disposing)
15         {
16             if (disposing && (components != null))
17             {
18                 components.Dispose();
19             }
20             base.Dispose(disposing);
21         }
22 
23         #region Windows Form Designer generated code
24 
25         /// 

26         /// Required method for Designer support - do not modify
27         /// the contents of this method with the code editor.
28         /// 
29         private void InitializeComponent()
30         {
31             this.components = new System.ComponentModel.Container();
32             System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(FrmAnchor));
33             this.timer1 = new System.Windows.Forms.Timer(this.components);
34             this.SuspendLayout();
35             // 
36             // timer1
37             // 
38             this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
39             // 
40             // FrmAnchor
41             // 
42             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
43             this.ClientSize = new System.Drawing.Size(45, 48);
44             this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
45             this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
46             this.Name = "FrmAnchor";
47             this.ShowIcon = false;
48             this.ShowInTaskbar = false;
49             this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
50             this.Text = "FrmAnchor";
51             this.TopMost = true;
52             this.Load += new System.EventHandler(this.FrmAnchor_Load);
53             this.VisibleChanged += new System.EventHandler(this.FrmAnchor_VisibleChanged);
54             this.ResumeLayout(false);
55 
56         }
57 
58         #endregion
59 
60         private System.Windows.Forms.Timer timer1;
61     }
62 }

View Code

用处及效果

用处：弹出菜单，文本框弹出键盘等

最后的话

如果你喜欢的话，请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星 星吧