Winfrom下实现类似百度、Google搜索智能提示功能代码,CSharp代码库,德仔网

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【CSharp】 Winfrom下实现类似百度、Google搜索智能提示功能

作者:rock870210 / 发布于2014/6/26/ 703

数据源来自页面的一个ComboBox的数据源List集合页面放置一个TextBox(搜索框)、ListBox（显示搜索出来的数据），ListBox位置位于TextBox正下方，初始化隐藏。 TextBox--->txtSearch ListBox--->listBox1关于两个控件的事件，详见代码：


	#region 自能提示
	 Point pList = new Point();

	 private void txtSearch_TextChanged(object sender, EventArgs e)
	 {
	 if (this.txtSearch.Text.Trim() != "")
	 {
	 List<Contract> source = getDataTable(this.txtSearch.Text.Trim());
	 BindList(source);
	 this.listBox1.Visible = true;
	 }
	 else
	 {
	 this.listBox1.Items.Clear();
	 this.listBox1.Visible = false;
	 }
	 }

	 private void txtSearch_KeyDown(object sender, KeyEventArgs e)
	 {
	 if (e.KeyCode == Keys.Down && this.listBox1.Visible)
	 {
	 this.listBox1.Focus();

	 if (this.listBox1.SelectedItems.Count > 0)
	 {
	 this.listBox1.SetSelected(this.listBox1.SelectedIndex, false);
	 }
	 if (this.listBox1.Items.Count > 0)
	 {
	 this.listBox1.SetSelected(0, true);

	 }
	 }
	 }

	 private void listBox1_MouseUp(object sender, MouseEventArgs e)
	 {
	 if (this.listBox1.SelectedItems.Count > 0)
	 {
	 this.txtSearch.Text = this.listBox1.Text;
	 cboChoCont.Text = this.txtSearch.Text;
	 this.listBox1.Visible = false;
	 this.txtSearch.Focus();
	 }
	 }

	 private void listBox1_MouseMove(object sender, MouseEventArgs e)
	 {
	 Point m = new Point(e.X, e.Y);
	 int index = GetItemAt(this.listBox1, e.X, e.Y);
	 if (this.listBox1.SelectedItems.Count > 0 && this.listBox1.SelectedIndex != index)
	 {
	 this.listBox1.SetSelected(this.listBox1.SelectedIndex, false);
	 }

	 if (index != -1 && this.listBox1.SelectedIndex != index)
	 {

	 this.listBox1.SetSelected(index, true);
	 }
	 }

	 private void listBox1_KeyDown(object sender, KeyEventArgs e)
	 {
	 if (e.KeyCode == Keys.Enter && this.listBox1.Visible && this.listBox1.SelectedItems.Count > 0)
	 {
	 this.txtSearch.Text = this.listBox1.SelectedItems[0].ToString();
	 this.cboChoCont.Text = this.txtSearch.Text;
	 this.listBox1.Visible = false;
	 this.txtSearch.Focus();
	 }
	 }

	 private bool GetItemAt(Point Mousep, int index)
	 {
	 int ph = this.listBox1.GetItemHeight(index) * index;
	 int ph1 = this.listBox1.GetItemHeight(index) * index + this.listBox1.GetItemHeight(index);

	 if (Mousep.Y > ph && Mousep.Y < ph1 && Mousep.X > 0 && Mousep.X < this.listBox1.Width)
	 {
	 return true;
	 }
	 else
	 {
	 return false;
	 }

	
	 }
	 private int GetItemAt(ListBox listBox, int X, int Y)
	 {
	 int index = -1;
	 for (int i = 0; i < listBox.Items.Count; i++)
	 {
	 System.Drawing.Rectangle r = listBox.GetItemRectangle(i);
	 if (r.Contains(new Point(X, Y)))
	 {
	 index = i; ;
	 break;
	 }
	 }
	 return index;
	 }

	 private void BindList(List<Contract> source)
	 {
	 this.listBox1.Items.Clear();
	 for (int i = 0; i < source.Count; i++)
	 {
	 this.listBox1.Items.Add(source[i].Con_Name_Serial);
	 }
	 if (source.Count < 11)
	 {
	 this.listBox1.Height = 15 * source.Count + 15;
	 }
	 else
	 {
	 this.listBox1.Height = 150;
	 }
	 this.listBox1.Visible = true;
	 }

	
	 private List<Contract> getDataTable(string s)
	 {
	 List<Contract> searchList = new List<Contract>();
	 int length = list.Count;
	 for (int i = 0; i < length; i++)
	 {
	 if (list[i].Con_Name_Serial.IndexOf(s) == 0)
	 searchList.Add(list[i]);
	 }
	 return searchList;
	 }

	 private void listBox1_DrawItem(object sender, DrawItemEventArgs e)
	 {
	 // Set the DrawMode property to draw fixed sized items.
	 listBox1.DrawMode = DrawMode.OwnerDrawFixed;
	 // Draw the background of the ListBox control for each item.
	 e.DrawBackground();
	 // Define the default color of the brush as black.
	 Brush myBrush = Brushes.Black;
	 FontFamily fontFamily = new FontFamily("宋体");
	 System.Drawing.Font myFont = new Font(fontFamily, 9);
	 // Determine the color of the brush to draw each item based on the index of the item to draw.
	 if((e.State & DrawItemState.Selected) == DrawItemState.Selected)
	 {
	 //e.Graphics.FillRectangle(Brushes.Blue, e.Bounds);
	 if(e.Index > -1)
	 {
	 e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), myFont, Brushes.White, e.Bounds, StringFormat.GenericDefault);
	 }
	 }
	 else
	 {
	 //e.Graphics.FillRectangle(Brushes.White, e.Bounds);
	 if(e.Index > -1)
	 {
	 e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), myFont, myBrush, e.Bounds, StringFormat.GenericDefault);
	 }
	 }
	 // Draw the current item text based on the current Font and the custom brush settings.
	 //e.Graphics.DrawString(listBox1.Items[e.Index].ToString(), e.Font, myBrush, e.Bounds, StringFormat.GenericDefault);

	
	 // If the ListBox has focus, draw a focus rectangle around the selected item.
	 e.DrawFocusRectangle();
	 }
	 #endregion

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　Winfrom　　智能提示　　提示功能　

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