gcomboxbase.cs

语音视频功能 里面实现了基本的QQ与语音对话

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

namespace gowk.controls
{
	/// <summary>
	/// GComboBox 的摘要说明。
	/// </summary>
	public class GComboxBase:GEditBase
	{
		private GButton gPanel1;	
		private ListBox lb;
		private Form f;
		private int maxDrawDownItems=5;
		public event System.EventHandler SelectedIndexChanged;
		public GComboxBase():base(null)
		{
			this.gPanel1 = new GButton();
			this.gPanel1.Dock=DockStyle.Right;
			this.gPanel1.Width=14;
			this.gPanel1.Click+=new EventHandler(gPanel1_Click);
			this.Controls.Add(gPanel1);

			this.lb=new ListBox();
			this.lb.Dock=DockStyle.Fill;
		//	this.lb.DrawMode=DrawMode.OwnerDrawVariable;
		//	this.lb.DrawItem+=new System.Windows.Forms.DrawItemEventHandler(lb_DrawItem);
		//	this.lb.MeasureItem+=new MeasureItemEventHandler(lb_MeasureItem);
			this.lb.BorderStyle=BorderStyle.None;
			this.lb.MouseMove+=new MouseEventHandler(lb_MouseMove);
			this.lb.Paint+=new PaintEventHandler(GComboxBase_Paint);
			this.lb.Click+=new EventHandler(lb_Click);
			this.lb.SelectedIndexChanged+=new EventHandler(lb_SelectedIndexChanged);

			this.f=new Form();
			this.f.TopMost=true;
			this.f.ShowInTaskbar=false;
			this.f.FormBorderStyle=FormBorderStyle.None;
			this.f.StartPosition=System.Windows.Forms.FormStartPosition.Manual;
			this.f.Deactivate+=new EventHandler(f_Deactivate);
			f.Controls.Add(this.lb);

			System.Reflection.MethodInfo mi=typeof(ListBox).GetMethod("SetStyle",BindingFlags.Instance|BindingFlags.NonPublic);
			mi.Invoke(this.lb,new object[]{ControlStyles.DoubleBuffer|ControlStyles.AllPaintingInWmPaint|ControlStyles.UserPaint,true});
		}

		private void lb_DrawItem(object sender, DrawItemEventArgs e)
		{
			this.OnDrawItem(e);
		}
		protected virtual void OnDrawItem(DrawItemEventArgs e)
		{
			if(e.Index==-1)return;

			bool focus=(e.State & DrawItemState.Focus)==DrawItemState.Focus;
			GComboxItem item=(GComboxItem)this.Items[e.Index];
			Rectangle imgRect=new Rectangle(e.Bounds.X+4,e.Bounds.Y+2,16,16);
			Rectangle strRect=new Rectangle(e.Bounds.X+26,e.Bounds.Y,e.Bounds.Width-18,e.Bounds.Height);
			if(focus)imgRect.Offset(-1,-1);

//background
			e.Graphics.FillRectangle(new SolidBrush(this.BackColor),e.Bounds);
			//draw image
			if(item.Image!=null)
			{
				e.Graphics.DrawImage(item.Image,imgRect);
			}
		//draw text	
			StringFormat sf=new StringFormat();
			sf.Trimming=StringTrimming.EllipsisCharacter;
			sf.LineAlignment=StringAlignment.Center;
			e.Graphics.DrawString(item.Text,this.Font,new SolidBrush(this.ForeColor),strRect,sf);
//focus item
			if(focus)
			{
				e.Graphics.DrawRectangle(new Pen(this.BorderColor.NormalColor),new Rectangle(e.Bounds.X,e.Bounds.Y,e.Bounds.Width-1,e.Bounds.Height-1));
			}
		}

		private void gPanel1_Click(object sender, EventArgs e)
		{
			Point p=this.PointToScreen(new Point(0,this.Height));
			this.f.Height=(this.Height-4)*this.maxDrawDownItems;
			this.f.Width=this.Width;
			this.f.Show();
			this.f.Location=p;
		}

		private void f_Deactivate(object sender, EventArgs e)
		{
			this.f.Hide();
		}
		private void OnMeasureItem(MeasureItemEventArgs e)
		{
			e.ItemHeight=this.Height-4;
		}

		protected virtual void lb_MeasureItem(object sender, MeasureItemEventArgs e)
		{
			this.OnMeasureItem(e);
		}
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
		Editor("System.Windows.Forms.Design.ListControlStringCollectionEditor, System.Design", typeof(UITypeEditor))]
		public System.Windows.Forms.ListBox.ObjectCollection Items
		{
			get{return this.lb.Items;}
		}

		private void lb_MouseMove(object sender, MouseEventArgs e)
		{
			this.lb.Invalidate();
		}

		private void GComboxBase_Paint(object sender, PaintEventArgs e)
		{
			for(int i=0;i<this.Items.Count;i++)
			{
				Rectangle rect=this.lb.GetItemRectangle(i);
				if(rect.Bottom<=0)
					continue;
				else if(rect.Top>this.lb.Height)
					break;
				else
				{
					DrawItemState state=DrawItemState.Default;
					if(rect.Contains(this.lb.PointToClient(Control.MousePosition)))
					{
						state|=DrawItemState.Focus;
					}
					if(i==this.lb.SelectedIndex)
					{
						state|=DrawItemState.Selected;
					}
					else
					{
					}
					this.OnDrawItem(new DrawItemEventArgs(e.Graphics,this.Font,rect,i,state));
				}
			}
		}

		public int MaxDropDownItems
		{
			get{return this.maxDrawDownItems;}
			set{this.maxDrawDownItems=value;}
		}
		private void lb_Click(object sender, EventArgs e)
		{
			this.f_Deactivate(null,null);
		}
		public int SelectedIndex
		{
			get{return this.lb.SelectedIndex;}
			set{this.lb.SelectedIndex=value;}
		}
		public object SelectedItem
		{
			get{return this.lb.SelectedItem;}
			set{this.lb.SelectedItem=value;}
		}

		private void lb_SelectedIndexChanged(object sender, EventArgs e)
		{
			if(this.SelectedIndexChanged!=null)this.SelectedIndexChanged(this,e);
			this.EditControl.Text=this.lb.GetItemText(this.SelectedItem);
		}
		public override Color BackColor
		{
			get
			{
				return base.BackColor;
			}
			set
			{
				base.BackColor = value;
				this.gPanel1.BackColor=value;
			}
		}

		public GImage DropDownButtonImage
		{
			get{return this.gPanel1.GImage;}
			set{this.gPanel1.GImage=value;}
		}
	}
	public class GComboxItem
	{
		public GComboxItem(){}
		public GComboxItem(string text){this.Text=text;}
		public GComboxItem(string text,Image img):this(text){this.Image=img;}
		public object Tag;
		public Image Image;
		public string Text;
		public override string ToString()
		{
			return this.Text;
		}

	}
}