核心类:
1 using System; 2 using System.Collections.Generic; 3 using System.Drawing; 4 using System.Linq; 5 using System.Text; 6 using System.Threading.Tasks; 7 using System.Windows.Forms; 8 9 namespace ControlTest 10 public class AddControlDragAttr 11 { 12 //委托事件 用于支持将其他的可拖拉的控件描点置隐藏 13 public event EventHandler OtherLabelsVisibleEvent; 14 15 /// <summary> 16 /// 当前控件 17 /// </summary> 18 public Control CurrControl { get; private set; } 19 20 /// <summary> 21 /// 当前鼠标点击坐标 22 /// </summary> 23 Point downPoint; 24 /// <summary> 25 /// 当前控件的左右宽高 26 /// </summary> 27 int normalLeft, normalTop, normalWidth, normalHeight; 28 29 /// <summary> 30 /// 是否允许拖拉 31 /// </summary> 32 bool draging; 33 34 /// <summary> 35 /// 控件最小值 36 /// </summary> 37 public int ControlMinSize => 10; 38 39 /// <summary> 40 /// 是否已点击 41 /// </summary> 42 bool isDown = false; 43 /// <summary> 44 /// 点击可拖动的描点的控件 45 /// </summary> 46 Label[] labels = new Label[8]; 47 48 private Color barColor = Color.Black; 49 /// <summary> 50 /// 拖动块的颜色 51 /// </summary> 52 public Color BarColor 53 { 54 get => this.barColor; 55 set 56 { 57 for (int i = 0; i < labels.Length; i++) 58 { 59 labels[i].BackColor = value; 60 } 61 this.barColor = value; 62 } 63 } 64 private bool labsVisible = false; 65 /// <summary> 66 /// 是否显示拖动块的描点 67 /// </summary> 68 public bool LabsVisible 69 { 70 get => labsVisible; 71 set 72 { 73 foreach (var lab in labels) 74 { 75 lab.Visible = value; 76 } 77 78 labsVisible = value; 79 } 80 } 81 82 private int barSize = 7; 83 /// <summary> 84 /// 拖动块描点的大小 85 /// </summary> 86 public int BarSize 87 { 88 get => this.barSize; 89 set 90 { 91 foreach (var item in labels) 92 { 93 item.Size = new Size(value, value); 94 } 95 this.barSize = value; 96 } 97 } 98 99 /// <summary> 100 ///系统自带的可拖动描点 101 /// </summary> 102 Cursor[] cursors = new Cursor[] 103 { 104 //获取双向对角线（西北/东南）大小调整光标 105 Cursors.SizeNWSE, 106 //获取双向垂直（北/南）大小调整光标 107 Cursors.SizeNS, 108 //获取双向对角线（东北/西南）大小调整光标 109 Cursors.SizeNESW, 110 //获取双向水平（西/东）大小调整光标 111 Cursors.SizeWE, 112 Cursors.SizeNWSE, 113 Cursors.SizeNS, 114 Cursors.SizeNESW, 115 Cursors.SizeWE, 116 }; 117 118 public AddControlDragAttr(Control control) 119 { 120 CurrControl = control; 121 CurrControl.MouseDown += control_MouseDown; 122 CurrControl.MouseUp += control_MouseUp; 123 CurrControl.MouseMove += control_MouseMove; 124 for (int i = 0; i < labels.Length; i++) 125 { 126 labels[i] = new Label 127 { 128 TabIndex = i, 129 BackColor = BarColor, 130 Cursor = cursors[i], 131 Text = "", 132 Visible = false, 133 //置顶 134 }; 135 labels[i].MouseDown += label_MouseDown; 136 labels[i].MouseMove += label_MouseMove; 137 labels[i].MouseUp += label_MouseUp; 138 139 CurrControl.Parent.Controls.Add(labels[i]); 140 } 141 } 142 143 //控件事件 144 private void control_MouseDown(object sender, MouseEventArgs e) 145 { 146 downPoint = e.Location; 147 isDown = true; 148 LabsVisible = false; 149 150 } 151 152 private void control_MouseMove(object sender, MouseEventArgs e) 153 { 154 if (isDown) 155 { 156 int x = CurrControl.Location.X + e.Location.X - downPoint.X; 157 int y = CurrControl.Location.Y + e.Location.Y - downPoint.Y; 158 159 CurrControl.Location = new Point(x, y); 160 LabsVisible = false; 161 } 162 } 163 164 private void control_MouseUp(object sender, MouseEventArgs e) 165 { 166 int x = CurrControl.Location.X + e.Location.X - downPoint.X; 167 int y = CurrControl.Location.Y + e.Location.Y - downPoint.Y; 168 169 CurrControl.Location = new Point(x, y); 170 171 SetBarBounds(); 172 isDown = false; 173 174 LabsVisible = true; 175 176 OtherLabelsVisibleEvent?.Invoke(null,null); 177 } 178 179 //控件拖动块描点事件 180 private void label_MouseDown(object sender, MouseEventArgs e) 181 { 182 this.draging = true; 183 this.normalLeft = CurrControl.Left; 184 this.normalTop = CurrControl.Top; 185 this.normalWidth = CurrControl.Width; 186 this.normalHeight = CurrControl.Height; 187 this.LabsVisible = false; 188 } 189 190 /// <summary> 191 /// 0 1 2 192 /// 7 3 193 /// 6 5 4 194 /// </summary> 195 /// <param name="sender"></param> 196 /// <param name="e"></param> 197 private void label_MouseMove(object sender, MouseEventArgs e) 198 { 199 int left = CurrControl.Left; 200 int width = CurrControl.Width; 201 int top = CurrControl.Top; 202 int height = CurrControl.Height; 203 if (draging) 204 { 205 switch (((Control)sender).TabIndex) 206 { 207 case 0: 208 left = normalLeft + e.X < normalLeft + normalWidth - ControlMinSize ? normalLeft + e.X : normalLeft + normalWidth - ControlMinSize; 209 top = normalTop + e.Y < normalTop + normalHeight - ControlMinSize ? normalTop + e.Y : normalTop + normalHeight - ControlMinSize; 210 width = normalLeft + normalWidth - CurrControl.Left; 211 height = normalTop + normalHeight - CurrControl.Top; 212 break; 213 case 1: 214 top = normalTop + e.Y < normalTop + normalHeight - ControlMinSize ? normalTop + e.Y : normalTop + normalHeight - ControlMinSize; 215 height = normalTop + normalHeight - CurrControl.Top; 216 break; 217 case 2: 218 width = normalWidth + e.X > ControlMinSize ? normalWidth + e.X : ControlMinSize; 219 top = normalTop + e.Y < normalTop + normalHeight - ControlMinSize ? normalTop + e.Y : normalTop + normalHeight - ControlMinSize; 220 height = normalTop + normalHeight - CurrControl.Top; 221 break; 222 case 3: 223 width = normalWidth + e.X > ControlMinSize ? normalWidth + e.X : ControlMinSize; 224 break; 225 case 4: 226 width = normalWidth + e.X > ControlMinSize ? normalWidth + e.X : ControlMinSize; 227 height = normalHeight + e.Y > ControlMinSize ? normalHeight + e.Y : ControlMinSize; 228 break; 229 case 5: 230 height = normalHeight + e.Y > ControlMinSize ? normalHeight + e.Y : ControlMinSize; 231 break; 232 case 6: 233 left = normalLeft + e.X < normalLeft + normalWidth - ControlMinSize ? normalLeft + e.X : normalLeft + normalWidth - ControlMinSize; 234 width = normalLeft + normalWidth - CurrControl.Left; 235 height = normalHeight + e.Y > ControlMinSize ? normalHeight + e.Y : ControlMinSize; 236 break; 237 case 7: 238 left = normalLeft + e.X < normalLeft + normalWidth - ControlMinSize ? normalLeft + e.X : normalLeft + normalWidth - ControlMinSize; 239 width = normalLeft + normalWidth - CurrControl.Left; 240 break; 241 } 242 left = (left < 0) ? 0 : left; 243 top = (top < 0) ? 0 : top; 244 CurrControl.SetBounds(left, top, width, height); 245 } 246 } 247 248 private void label_MouseUp(object sender, MouseEventArgs e) 249 { 250 draging = false; 251 SetBarBounds(); 252 this.LabsVisible = true; 253 } 254 255 //设置拖动块描点的位置 256 private void SetBarBounds() 257 { 258 int x = CurrControl.Left - BarSize; 259 int y = CurrControl.Top - BarSize; 260 int w = CurrControl.Width + BarSize; 261 int h = CurrControl.Height + BarSize; 262 int b = BarSize / 2; 263 var px = new List<int> 264 { 265 x + b, 266 x + w / 2, 267 x + w - b, 268 x + w - b, 269 x + w - b, 270 x + w / 2, 271 x + b, 272 x + b, 273 }; 274 var py = new List<int> 275 { 276 y + b, 277 y + b, 278 y + b, 279 y + h / 2, 280 y + h - b, 281 y + h - b, 282 y + h - b, 283 y + h / 2 284 }; 285 286 for (int i = 0; i < labels.Length; i++) 287 { 288 labels[i].SetBounds(px[i], py[i], BarSize, BarSize); 289 } 290 } 291 } 292 }
调用实例：
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.IO; 7 using System.Linq; 8 using System.Text; 9 using System.Threading.Tasks; 10 using System.Windows.Forms; 11 12 namespace ControlTest 13 { 14 public partial class Form1 : Form 15 { 16 List<AddControlDragAttr> listcontrolsattr = new List<AddControlDragAttr>(); 17 18 public Form1() 19 { 20 InitializeComponent(); 21 } 22 23 protected override void OnLoad(EventArgs e) 24 { 25 base.OnLoad(e); 26 this.Controls.AddRange(new Control[] { 27 new UserControl1{ Name = "usercontrol1" }, 28 new Button{ Name ="btn1", Size = new Size(250,100) 29 ,Text= "马克思和恩格斯对社会主义发展出了他们的理论体系，亦认为社会主义社会是资本主义社会向共产主义社会过渡的社会形态" }, 30 new PictureBox{ Name="pic1", Size = new Size(200,100), Location = new Point(100,50) 31 ,BackgroundImage = Image.FromFile(Path.Combine(AppDomain.CurrentDomain.BaseDirectory , "img.jpg")) 32 ,BackgroundImageLayout = ImageLayout.Stretch} 33 }); 34 35 foreach (Control control in this.Controls) 36 { 37 var controlattr = new AddControlDragAttr(control); 38 39 //将其他控件的描点隐藏 40 controlattr.OtherLabelsVisibleEvent += (sender1,e1) => { 41 SetOtherLabelVisible(control); 42 }; 43 44 listcontrolsattr.Add(controlattr); 45 } 46 } 47 48 public void SetOtherLabelVisible(Control control) 49 { 50 foreach (AddControlDragAttr item in listcontrolsattr) 51 { 52 if (item.CurrControl.Name != control.Name) 53 item.LabsVisible = false; 54 } 55 } 56 57 } 58 }