遮罩层实现

1 新建组件 代码

namespace MyOpaqueLayer
{
/// <summary>
/// 自定义控件:半透明控件
/// </summary>
/*
* [ToolboxBitmap(typeof(MyOpaqueLayer))]
* 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。
* 正确写法应该是
* [ToolboxBitmap(typeof(XXXXControl),"xxx.bmp")]
* 其中XXXXControl是你的自定义控件，"xxx.bmp"是你要用的图标名称。
*/
[System.Drawing.ToolboxBitmap(typeof(MyOpaqueLayer))]
public class MyOpaqueLayer : System.Windows.Forms.Control
{
private bool _transparentBG = true;//是否使用透明
private int _alpha = 125;//设置透明度

private System.ComponentModel.Container components = new System.ComponentModel.Container();

public MyOpaqueLayer()
: this(125, true)
{
}

public MyOpaqueLayer(int Alpha, bool IsShowLoadingImage)
{
SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);
base.CreateControl();

this._alpha = Alpha;
if (IsShowLoadingImage)
{
PictureBox pictureBox_Loading = new PictureBox();
pictureBox_Loading.BackColor = System.Drawing.Color.White;
pictureBox_Loading.Image = wait.Properties.Resources.loading;
pictureBox_Loading.Name = "pictureBox_Loading";
pictureBox_Loading.Size = new System.Drawing.Size(48, 48);
pictureBox_Loading.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
Point Location = new Point(this.Location.X + (this.Width - pictureBox_Loading.Width) / 2, this.Location.Y + (this.Height - pictureBox_Loading.Height) / 2);//居中
pictureBox_Loading.Location = Location;
pictureBox_Loading.Anchor = AnchorStyles.None;
this.Controls.Add(pictureBox_Loading);
}
}

protected override void Dispose(bool disposing)
{
if (disposing)
{
if (!((components == null)))
{
components.Dispose();
}
}
base.Dispose(disposing);
}

/// <summary>
/// 自定义绘制窗体
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
float vlblControlWidth;
float vlblControlHeight;

Pen labelBorderPen;
SolidBrush labelBackColorBrush;

if (_transparentBG)
{
Color drawColor = Color.FromArgb(this._alpha, this.BackColor);
labelBorderPen = new Pen(drawColor, 0);
labelBackColorBrush = new SolidBrush(drawColor);
}
else
{
labelBorderPen = new Pen(this.BackColor, 0);
labelBackColorBrush = new SolidBrush(this.BackColor);
}
base.OnPaint(e);
vlblControlWidth = this.Size.Width;
vlblControlHeight = this.Size.Height;
e.Graphics.DrawRectangle(labelBorderPen, 0, 0, vlblControlWidth, vlblControlHeight);
e.Graphics.FillRectangle(labelBackColorBrush, 0, 0, vlblControlWidth, vlblControlHeight);
}

protected override CreateParams CreateParams//v1.10
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00000020; //0x20; // 开启 WS_EX_TRANSPARENT,使控件支持透明
return cp;
}
}

/*
* [Category("myOpaqueLayer"), Description("是否使用透明,默认为True")]
* 一般用于说明你自定义控件的属性（Property）。
* 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。
*/
[Category("MyOpaqueLayer"), Description("是否使用透明,默认为True")]
public bool TransparentBG
{
get
{
return _transparentBG;
}
set
{
_transparentBG = value;
this.Invalidate();
}
}

[Category("MyOpaqueLayer"), Description("设置透明度")]
public int Alpha
{
get
{
return _alpha;
}
set
{
_alpha = value;
this.Invalidate();
}
}

private void InitializeComponent()
{
this.SuspendLayout();
//
// MyOpaqueLayer
//
this.BackgroundImage = global::wait.Properties.Resources.loading;
this.ResumeLayout(false);

}
}
}

2 控制遮罩层

新建类 

class OpaqueCommand
{
private MyOpaqueLayer.MyOpaqueLayer m_OpaqueLayer = null;//半透明蒙板层

/// <summary>
/// 显示遮罩层
/// </summary>
/// <param name="control">控件</param>
/// <param name="alpha">透明度</param>
/// <param name="isShowLoadingImage">是否显示图标</param>
public void ShowOpaqueLayer(Control control, int alpha, bool isShowLoadingImage)
{
try
{
if (this.m_OpaqueLayer == null)
{
this.m_OpaqueLayer = new MyOpaqueLayer.MyOpaqueLayer(alpha, isShowLoadingImage);
control.Controls.Add(this.m_OpaqueLayer);
this.m_OpaqueLayer.Dock = DockStyle.Fill;
this.m_OpaqueLayer.BringToFront();
}
this.m_OpaqueLayer.Enabled = true;
this.m_OpaqueLayer.Visible = true;
}
catch { }
}

/// <summary>
/// 隐藏遮罩层
/// </summary>
public void HideOpaqueLayer()
{
try
{
if (this.m_OpaqueLayer != null)
{
this.m_OpaqueLayer.Visible = false;
this.m_OpaqueLayer.Enabled = false;
}
}
catch (Exception ex)
{
//MessageBox.Show(ex.Message);
}
}

}

 

3 应用遮罩层

   OpaqueCommand cmd = new OpaqueCommand(); // new 新建的类

private void button1_Click(object sender, EventArgs e)
{

cmd.ShowOpaqueLayer(dataGridView1, 125, true);  //显示遮罩层 datagridview 遮罩容器

 cmd.HideOpaqueLayer(); //隐藏遮罩层

}