winform 自定义控件:半透明Loading控件

by wgscd

date:2015-05-05

效果：

using System;
using System.Drawing;
using System.Windows.Forms;
using System.ComponentModel;
using System.Threading;

namespace wgscd
{
/// <summary>
/// 自定义控件:半透明控件
/// </summary>

[ToolboxBitmap(typeof(MyLoadingCtl))]
public class MyLoadingCtl : System.Windows.Forms.Control
{
private bool _transparentBG = true;//是否使用透明
private int _alpha = 125;//设置透明度
private SolidBrush fontBrush= new SolidBrush(Color.FromArgb(206,94,94,94));

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

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

/// <summary>
/// 显示遮罩层
/// </summary>
/// <param name="form">要显示的父窗体</param>
public void ShowLoading(Form form)
{

try
{
// SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);
base.CreateControl();
form.Controls.Add(this);
// this._alpha = Alpha;
// if (isShowLoadingImage)
//{
// PictureBox pictureBox_Loading = new PictureBox();
// pictureBox_Loading.BackColor = System.Drawing.Color.White;
// pictureBox_Loading.Image = 加载中.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);
//}

this.Dock = DockStyle.Fill;
this.BringToFront();
this.Enabled = true;
this.Visible = true;
Refresh();
Invalidate();

}
catch { }

}

public MyLoadingCtl(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 = 加载中.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);
Invalidate();
}
}

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);
e.Graphics.DrawString("正在加载...",new Font("黑体",10), fontBrush, vlblControlWidth/2-30, vlblControlHeight/2+40);

}

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("MyLoadingCtl"), 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("MyLoadingCtl"), Description("是否使用透明,默认为True")]
public bool TransparentBG
{
get
{
return _transparentBG;
}
set
{
_transparentBG = value;
this.Invalidate();
}
}

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

}

外部窗体调用：

public Form1()
{
InitializeComponent();
bgWorker.DoWork += BgWorker_DoWork;
bgWorker.RunWorkerCompleted += BgWorker_RunWorkerCompleted;
}

BackgroundWorker bgWorker = new BackgroundWorker();
wgscd.MyLoadingCtl loadingCtl = new wgscd.MyLoadingCtl(162,true);//定义加载控件
private void BgWorker_DoWork(object sender, DoWorkEventArgs e)
{

System.Threading.Thread.Sleep(3333);

}

private void BgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
loadingCtl.Hide();

}

private void btnShow_Click(object sender, EventArgs e)
{
//显示加载动画
loadingCtl.ShowLoading(this);
Application.DoEvents();
bgWorker.RunWorkerAsync();

}

用到是loading GIF图片：