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C# Winform 实现自定义半透明loading加载遮罩层

2024-07-26 03:14:20   226人阅读

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：

View Row Code
1using System;
2using System.Drawing;
3using System.Windows.Forms;
4using System.ComponentModel;
5 
6namespace 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))]
19public class MyOpaqueLayer : System.Windows.Forms.Control
20{
21private bool _transparentBG = true;//是否使用透明
22private int _alpha = 125;//设置透明度
23 
24private System.ComponentModel.Container components = new System.ComponentModel.Container();
25 
26public MyOpaqueLayer()
27: this(125, true)
28{
29}
30 
31public MyOpaqueLayer(int Alpha, bool IsShowLoadingImage)
32{
33SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);
34base.CreateControl();
35 
36this._alpha = Alpha;
37if (IsShowLoadingImage)
38{
39PictureBox pictureBox_Loading = new PictureBox();
40pictureBox_Loading.BackColor = System.Drawing.Color.White;
41pictureBox_Loading.Image = 加载中.Properties.Resources.loading;
42pictureBox_Loading.Name = "pictureBox_Loading";
43pictureBox_Loading.Size = new System.Drawing.Size(48, 48);
44pictureBox_Loading.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
45Point Location = new Point(this.Location.X + (this.Width - pictureBox_Loading.Width) / 2, this.Location.Y + (this.Height - pictureBox_Loading.Height) / 2);//居中
46pictureBox_Loading.Location = Location;
47pictureBox_Loading.Anchor = AnchorStyles.None;
48this.Controls.Add(pictureBox_Loading);
49}
50}
51 
52 
53protected override void Dispose(bool disposing)
54{
55if (disposing)
56{
57if (!((components == null)))
58{
59components.Dispose();
60}
61}
62base.Dispose(disposing);
63}
64 
65/// <summary>
66/// 自定义绘制窗体
67/// </summary>
68/// <param name="e"></param>
69protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
70{
71float vlblControlWidth;
72float vlblControlHeight;
73 
74Pen labelBorderPen;
75SolidBrush labelBackColorBrush;
76 
77if (_transparentBG)
78{
79Color drawColor = Color.FromArgb(this._alpha, this.BackColor);
80labelBorderPen = new Pen(drawColor, 0);
81labelBackColorBrush = new SolidBrush(drawColor);
82}
83else
84{
85labelBorderPen = new Pen(this.BackColor, 0);
86labelBackColorBrush = new SolidBrush(this.BackColor);
87}
88base.OnPaint(e);
89vlblControlWidth = this.Size.Width;
90vlblControlHeight = this.Size.Height;
91e.Graphics.DrawRectangle(labelBorderPen, 0, 0, vlblControlWidth, vlblControlHeight);
92e.Graphics.FillRectangle(labelBackColorBrush, 0, 0, vlblControlWidth, vlblControlHeight);
93}
94 
95 
96protected override CreateParams CreateParams//v1.10
97{
98get
99{
100CreateParams cp = base.CreateParams;
101cp.ExStyle |= 0x00000020; //0x20; // 开启 WS_EX_TRANSPARENT,使控件支持透明
102return 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")]
112public bool TransparentBG
113{
114get
115{
116return _transparentBG;
117}
118set
119{
120_transparentBG = value;
121this.Invalidate();
122}
123}
124 
125[Category("MyOpaqueLayer"), Description("设置透明度")]
126public int Alpha
127{
128get
129{
130return _alpha;
131}
132set
133{
134_alpha = value;
135this.Invalidate();
136}
137}
138}
139}

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

View Row Code
1using System;
2using System.Windows.Forms;
3 
4namespace 加载中
5{
6class OpaqueCommand
7{
8private 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>
16public void ShowOpaqueLayer(Control control, int alpha, bool isShowLoadingImage)
17{
18try
19{
20if (this.m_OpaqueLayer == null)
21{
22this.m_OpaqueLayer = new MyOpaqueLayer.MyOpaqueLayer(alpha, isShowLoadingImage);
23control.Controls.Add(this.m_OpaqueLayer);
24this.m_OpaqueLayer.Dock = DockStyle.Fill;
25this.m_OpaqueLayer.BringToFront();
26}
27this.m_OpaqueLayer.Enabled = true;
28this.m_OpaqueLayer.Visible = true;
29}
30catch { }
31}
32 
33/// <summary>
34/// 隐藏遮罩层
35/// </summary>
36public void HideOpaqueLayer()
37{
38try
39{
40if (this.m_OpaqueLayer != null)
41{
42this.m_OpaqueLayer.Visible = false;
43this.m_OpaqueLayer.Enabled = false;
44}
45}
46catch(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

C# Winform 实现自定义半透明loading加载遮罩层


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