C# 系统应用之透明罩MyOpaqueLayer实现360界面阴影效果

一.自定义透明罩MyOpaqueLayer组件

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

namespace MyOpaqueLayer
{
    /* 
     * [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。
    */
    [ToolboxBitmap(typeof(MyOpaqueLayer))]

    /// <summary>
    /// 自定义控件:透明罩控件(继承Control)
    /// </summary>
    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);  //设置控件样式
            base.CreateControl();                                       //创建控件
            this._alpha = Alpha;
            //放置加载进度的图片代码此处被省略
        }

        //释放组件占用内存
        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;                     //定义Pen
            SolidBrush labelBackColorBrush;         //定义单色画笔

            if (_transparentBG)                     //使用透明
            {
                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);
        }

        //获取创建控件句柄时所需要的创建参数
        protected override CreateParams CreateParams //v1.10 
        {
            get
            {
                CreateParams cp = base.CreateParams;  //扩展派生类CreateParams属性
                cp.ExStyle |= 0x00000020;             //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();
            }
        }
        //设置透明度
        [Category("MyOpaqueLayer"), Description("设置透明度")]
        public int Alpha
        {
            get
            {
                return _alpha;
            }
            set
            {
                _alpha = value;
                this.Invalidate();
            }
        }

        //初始化窗体
        private void InitializeComponent()
        {
            this.SuspendLayout();      //临时挂起控件的布局逻辑,它与ResumeLayout()配合使用
            this.ResumeLayout(false);  //恢复正常逻辑
        }
    }
}

二.自定义透明罩类OpaqueCommand

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EMSecure
{
    class OpaqueCommand
    {
        //透明罩
        private MyOpaqueLayer.MyOpaqueLayer m_OpaqueLayer = null;

        /// <summary>
        /// 显示透明层
        /// </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 (Exception msg)              //异常处理
            {
                MessageBox.Show(msg.Message);
            }
        }

        /// <summary>
        /// 隐藏透明层
        /// </summary>
        public void HideOpaqueLayer()
        {
            try
            {
                if (this.m_OpaqueLayer != null)
                {
                    this.m_OpaqueLayer.Visible = false;
                    this.m_OpaqueLayer.Enabled = false;
                }
            }
            catch (Exception msg)             //异常处理
            {
                MessageBox.Show(msg.Message);
            }
        }
    }
}

三.使用透明罩

//鼠标离开
private void myOpaqueLayer1_MouseLeave(object sender, EventArgs e)
{
    this.myOpaqueLayer1.Visible = false;
    this.label4.ForeColor = Color.White;
}
//鼠标进入
private void pictureBox1_MouseEnter(object sender, EventArgs e)
{
    this.myOpaqueLayer1.Visible = true;
    this.label4.ForeColor = Color.Yellow;
}

//自定义类OpaqueCommand
OpaqueCommand cmd = new OpaqueCommand();
//定义点击panel时透明罩情况
bool isClick = false;

//鼠标进入"清除IE"
private void panel_mol1_MouseEnter(object sender, EventArgs e)
{
    //透明罩设置 没点击才取消透明罩
    cmd.ShowOpaqueLayer(panel_mol1, 125, true);
}
private void panel_mol1_MouseEnter(object sender, EventArgs e)
{
    cmd.HideOpaqueLayer();
}

四.总结

个人感觉该设计还有很多地方需要自己改进,同时想实现ToolBar方法和了解如何添加自定义组件而不是拖拽,期望自己能解决这些问题.希望该文章对大家有所帮助,同时感谢下面3篇文章及博主,是讲述透明罩和如何自定义控件的文章,个人感觉非常不错.如果文章中有不足或错误的地方,请海涵!

(By:Eastmount 2014-3-10 中午2点 原创:http://blog.csdn.net/eastmount)

参考资料及在线笔记:

1.C#实现Winform自定义半透明遮罩层-海华(主要参考透明罩的设定)

http://www.cnblogs.com/JuneZhang/archive/2012/07/06/2579215.html

2.C#中自定义控件-杨友山(自定义控件简述)

/article/1419573.html

3.C#自定义控件开发-百度文库(详细介绍自定义控件\复合控件\扩展控件)

http://wenku.baidu.com/view/89a47f6e58fafab069dc02bf.html