graphiccolumn.cs

实现SHP

///GeoCon, free tool to create gml & svg from gis files. 
///Copyright(C) 2005 Amri Rosyada
///Distributed under GNU-LGPL, see a copy of the license in root directory
using System;
using System.Data; 
using System.Windows.Forms;
using System.Drawing;

using GeoCon.Classification;

namespace GeoCon.util
{
	/// <summary>
	/// Column Style for displaying Bin Symbol in datagrid.
	/// </summary>
	public class DataGridGraphicColumn : DataGridColumnStyle
	{
		private Button button=new Button();
		private CurrencyManager cm;
		private int iCurrentRow;

		/// <summary>
		/// Constructs new DataGridGraphicColumn
		/// </summary>
		public DataGridGraphicColumn()
		{
			button.BackColor=Color.Transparent; 
			button.FlatStyle=FlatStyle.Popup;
			button.Leave +=new EventHandler(button_Leave);
			button.Click +=new EventHandler(button_Click);
			//button.Paint +=new PaintEventHandler(button_Paint);
		}

		/// <summary>
		/// Refresh column drawing.
		/// </summary>
		public void updateCurrencyManager()
		{
			cm =(CurrencyManager) this.DataGridTableStyle.DataGrid.BindingContext[this.DataGridTableStyle.DataGrid.DataSource];
			this.button.Hide();
			this.Invalidate();
		}

		#region must override members
		protected override void Edit(CurrencyManager source, int rowNum, Rectangle bounds, bool readOnly, string instantText, bool cellIsVisible)
		{
			if(readOnly || cellIsVisible==false) return;
			cm=source;
			iCurrentRow = rowNum;
			button.Parent=this.DataGridTableStyle.DataGrid; 
			Rectangle rect=this.DataGridTableStyle.DataGrid.GetCurrentCellBounds();
			button.Location=rect.Location;
			button.Size=new Size(rect.Width, rect.Height);

			button.BringToFront();
			button.Show();
			button.Focus();
			this.DataGridTableStyle.DataGrid.Scroll+=new EventHandler(DataGrid_Scroll);
		}
		private void DataGrid_Scroll(object sender, EventArgs e)
		{
			this.button.Hide();
		}

		protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum)	
		{
			cm=source;
			Bin b = (Bin)cm.List[rowNum];
			b.Symbol.DrawIcon(g,bounds);
		}
		protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, bool alignToRight)
		{
			cm=source;
			Bin b = (Bin)cm.List[rowNum];
			b.Symbol.DrawIcon(g,bounds);
		}
		protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight)
		{
			cm=source;
			g.FillRectangle(backBrush,bounds);
			Bin b = (Bin)cm.List[rowNum];
			b.Symbol.DrawIcon(g,bounds);
		}
		protected override void Abort(int rowNum)
		{
		}
		protected override bool Commit(CurrencyManager dataSource, int rowNum)
		{
			this.ConcedeFocus();
			return true;
		}
		protected override int GetMinimumHeight(){return 0;}
		protected override int GetPreferredHeight(Graphics g, object value)	{return 20;}
		protected override Size GetPreferredSize(Graphics g, object value){return new Size(50,20);}
		#endregion

		#region optional override members
		protected override void SetColumnValueAtRow(CurrencyManager source, int rowNum, object Value)
		{
			base.SetColumnValueAtRow (source, rowNum, Value);
		}
		protected override object GetColumnValueAtRow(CurrencyManager source, int rowNum)
		{
			return source.List[rowNum];
		}
		protected override void UpdateUI(CurrencyManager source, int rowNum, string instantText)
		{
			base.UpdateUI (source, rowNum, instantText);
		}
		
//		protected override void ConcedeFocus()
//		{
//			this.button.Hide();
//			this.Invalidate();
//			base.ConcedeFocus ();
//		}
//		void Dispose()
//		{
//			button.Dispose();
//			if(!FStyle.IsDisposed) FStyle.Dispose();
//			Dispose(true);
//			GC.SuppressFinalize(this);
//		}
//		~DataGridGraphicColumn()
//		{
//			Dispose(false);
//		}
		#endregion
		
		#region button event handler
		/// <summary>
		/// 
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void button_Leave(object sender, EventArgs e)
		{
			this.button.Hide();
			this.Invalidate();
		}

		private GeoCon.StyleForm FStyle=new StyleForm();
		/// <summary>
		/// 
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void button_Click(object sender, EventArgs e)
		{
			if(FStyle.IsDisposed) FStyle = new StyleForm();
			FStyle.Owner=MainForm.ActiveForm; 
			FStyle.CurrencyMgr = cm;
			FStyle.Show();
			FStyle.BringToFront();

			//TODO : re-translate the icon to reflect clicked button
		}

		#endregion

	}
}