C# Winform 实现自定义半透明loading加载遮罩层

在网页中通过div+css实现半透明效果不难,今天我们看看一种在winfrom中实现的方法:

效果图如下,正常时:

C# Winform 实现自定义半透明遮罩层 - 1

显示遮罩层时:

C# Winform 实现自定义半透明遮罩层 - 2

自定义遮罩层控件的源码如下:

1 using System;
2 using System.Drawing;
3 using System.Windows.Forms;
4 using System.ComponentModel;
5  
6 namespace MyOpaqueLayer
7 {
8 /// <summary>
9 /// 自定义控件:半透明控件
10 /// </summary>
11 /*
12 * [ToolboxBitmap(typeof(MyOpaqueLayer))]
13 * 用于指定当把你做好的自定义控件添加到工具栏时,工具栏显示的图标。
14 * 正确写法应该是
15 * [ToolboxBitmap(typeof(XXXXControl),"xxx.bmp")]
16 * 其中XXXXControl是你的自定义控件,"xxx.bmp"是你要用的图标名称。
17 */
18 [ToolboxBitmap(typeof(MyOpaqueLayer))]
19 public class MyOpaqueLayer : System.Windows.Forms.Control
20 {
21 private bool _transparentBG = true;//是否使用透明
22 private int _alpha = 125;//设置透明度
23  
24 private System.ComponentModel.Container components = new System.ComponentModel.Container();
25  
26 public MyOpaqueLayer()
27 : this(125, true)
28 {
29 }
30  
31 public MyOpaqueLayer(int Alpha, bool IsShowLoadingImage)
32 {
33 SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);
34 base.CreateControl();
35  
36 this._alpha = Alpha;
37 if (IsShowLoadingImage)
38 {
39 PictureBox pictureBox_Loading = new PictureBox();
40 pictureBox_Loading.BackColor = System.Drawing.Color.White;
41 pictureBox_Loading.Image = 加载中.Properties.Resources.loading;
42 pictureBox_Loading.Name = "pictureBox_Loading";
43 pictureBox_Loading.Size = new System.Drawing.Size(48, 48);
44 pictureBox_Loading.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
45 Point Location = new Point(this.Location.X + (this.Width - pictureBox_Loading.Width) / 2, this.Location.Y + (this.Height - pictureBox_Loading.Height) / 2);//居中
46 pictureBox_Loading.Location = Location;
47 pictureBox_Loading.Anchor = AnchorStyles.None;
48 this.Controls.Add(pictureBox_Loading);
49 }
50 }
51  
52  
53 protected override void Dispose(bool disposing)
54 {
55 if (disposing)
56 {
57 if (!((components == null)))
58 {
59 components.Dispose();
60 }
61 }
62 base.Dispose(disposing);
63 }
64  
65 /// <summary>
66 /// 自定义绘制窗体
67 /// </summary>
68 /// <param name="e"></param>
69 protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
70 {
71 float vlblControlWidth;
72 float vlblControlHeight;
73  
74 Pen labelBorderPen;
75 SolidBrush labelBackColorBrush;
76  
77 if (_transparentBG)
78 {
79 Color drawColor = Color.FromArgb(this._alpha, this.BackColor);
80 labelBorderPen = new Pen(drawColor, 0);
81 labelBackColorBrush = new SolidBrush(drawColor);
82 }
83 else
84 {
85 labelBorderPen = new Pen(this.BackColor, 0);
86 labelBackColorBrush = new SolidBrush(this.BackColor);
87 }
88 base.OnPaint(e);
89 vlblControlWidth = this.Size.Width;
90 vlblControlHeight = this.Size.Height;
91 e.Graphics.DrawRectangle(labelBorderPen, 0, 0, vlblControlWidth, vlblControlHeight);
92 e.Graphics.FillRectangle(labelBackColorBrush, 0, 0, vlblControlWidth, vlblControlHeight);
93 }
94  
95  
96 protected override CreateParams CreateParams//v1.10
97 {
98 get
99 {
100 CreateParams cp = base.CreateParams;
101 cp.ExStyle |= 0x00000020; //0x20; // 开启 WS_EX_TRANSPARENT,使控件支持透明
102 return cp;
103 }
104 }
105  
106 /*
107 * [Category("myOpaqueLayer"), Description("是否使用透明,默认为True")]
108 * 一般用于说明你自定义控件的属性(Property)。
109 * Category用于说明该属性属于哪个分类,Description自然就是该属性的含义解释。
110 */
111 [Category("MyOpaqueLayer"), Description("是否使用透明,默认为True")]
112 public bool TransparentBG
113 {
114 get
115 {
116 return _transparentBG;
117 }
118 set
119 {
120 _transparentBG = value;
121 this.Invalidate();
122 }
123 }
124  
125 [Category("MyOpaqueLayer"), Description("设置透明度")]
126 public int Alpha
127 {
128 get
129 {
130 return _alpha;
131 }
132 set
133 {
134 _alpha = value;
135 this.Invalidate();
136 }
137 }
138 }
139 }

OpaqueCommand的方法:ShowOpaqueLayer(显示遮罩层)和HideOpaqueLayer(隐藏遮罩层)

1 using System;
2 using System.Windows.Forms;
3  
4 namespace 加载中
5 {
6 class OpaqueCommand
7 {
8 private MyOpaqueLayer.MyOpaqueLayer m_OpaqueLayer = null;//半透明蒙板层
9  
10 /// <summary>
11 /// 显示遮罩层
12 /// </summary>
13 /// <param name="control">控件</param>
14 /// <param name="alpha">透明度</param>
15 /// <param name="isShowLoadingImage">是否显示图标</param>
16 public void ShowOpaqueLayer(Control control, int alpha, bool isShowLoadingImage)
17 {
18 try
19 {
20 if (this.m_OpaqueLayer == null)
21 {
22 this.m_OpaqueLayer = new MyOpaqueLayer.MyOpaqueLayer(alpha, isShowLoadingImage);
23 control.Controls.Add(this.m_OpaqueLayer);
24 this.m_OpaqueLayer.Dock = DockStyle.Fill;
25 this.m_OpaqueLayer.BringToFront();
26 }
27 this.m_OpaqueLayer.Enabled = true;
28 this.m_OpaqueLayer.Visible = true;
29 }
30 catch { }
31 }
32  
33 /// <summary>
34 /// 隐藏遮罩层
35 /// </summary>
36 public void HideOpaqueLayer()
37 {
38 try
39 {
40 if (this.m_OpaqueLayer != null)
41 {
42 this.m_OpaqueLayer.Visible = false;
43 this.m_OpaqueLayer.Enabled = false;
44 }
45 }
46 catch(Exception ex)
47 {
48 //MessageBox.Show(ex.Message);
49 }
50 }
51 }
52 }

自定义半透明遮罩层源码下载:

files.cnblogs.com/JuneZhang/%E8%87%AA%E5%AE%9A%E4%B9%89%E5%8D%8A%E9%80%8F%E6%98%8E%E9%81%AE%E7%BD%A9%E5%B1%82-%E6%BA%90%E7%A0%81.rar

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