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   源码介绍

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// ImageListPopup by John O'Byrne
// This class pops up window displaying the different images
// contained in an ImageList and allows to select one.
// History: 24/02/2003 : Initial Release
//          25/02/2003 : Added Keyboard support (arrows   space or enter to validate)
//                       Added Drag'n'Drop Support (disabled by default) - The selected Image
//                       and its Id are available to the drop target

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace CustomUIControls
{
	public class ImageListPopupEventArgs : EventArgs
	{      
		public int SelectedItem;
		
		public ImageListPopupEventArgs(int selectedItem)
		{
			SelectedItem = selectedItem;
		}
	}

	public delegate void ImageListPopupEventHandler(object sender, ImageListPopupEventArgs ilpea);

	public class ImageListPopup : System.Windows.Forms.Form
	{
		#region Protected Member Variables
		protected Bitmap	_Bitmap = null;
		protected ImageList	_imageList = null;
		protected int		_nBitmapWidth = 0;
		protected int		_nBitmapHeight = 0;
		protected int		_nItemWidth = 0;
		protected int		_nItemHeight = 0;
		protected int		_nRows = 0;
		protected int		_nColumns = 0;
		protected int		_nHSpace = 0;
		protected int		_nVSpace = 0;
		protected int		_nCoordX = -1;
		protected int		_nCoordY = -1;
		protected bool		_bIsMouseDown = false;
		#endregion

		#region Public Properties
		public Color		BackgroundColor = Color.FromArgb(255,255,255);
		public Color		BackgroundOverColor = Color.FromArgb(241,238,231);
		public Color		HLinesColor = Color.FromArgb(222,222,222);
		public Color		VLinesColor = Color.FromArgb(165,182,222);
		public Color		BorderColor = Color.FromArgb(0,16,123);
		public bool			EnableDragDrop = false;
		#endregion

		#region Events
		public event		ImageListPopupEventHandler ItemClick = null;
		#endregion

		#region Constructor
		public ImageListPopup()
		{
			// Window Style
			FormBorderStyle = FormBorderStyle.None;
			WindowState = FormWindowState.Minimized;
			base.Show();
			base.Hide();
			WindowState = FormWindowState.Normal;
			ShowInTaskbar = false;
			TopMost = true;
			MaximizeBox = false;
			MinimizeBox = false;
			ControlBox = false;
		}
		#endregion

		#region Public Methods
		public bool Init(ImageList imageList, int nHSpace, int nVSpace, int nColumns, int nRows)
		{
			_imageList = imageList;
			_nColumns = nColumns;
			_nRows = nRows;
			_nHSpace = nHSpace;
			_nVSpace = nVSpace;
			_nItemWidth = _imageList.ImageSize.Width   nHSpace;
			_nItemHeight = _imageList.ImageSize.Height   nVSpace;
			_nBitmapWidth = _nColumns * _nItemWidth   1;
			_nBitmapHeight = _nRows * _nItemHeight   1;
			this.Width = _nBitmapWidth;
			this.Height = _nBitmapHeight;


			_Bitmap = new Bitmap(_nBitmapWidth,_nBitmapHeight);
			Graphics grfx =	Graphics.FromImage(_Bitmap);
			grfx.FillRectangle(new SolidBrush(BackgroundColor), 0, 0, _nBitmapWidth, _nBitmapHeight);
			for (int i=0;i<_nColumns;i  )
				grfx.DrawLine(new Pen(VLinesColor), i*_nItemWidth, 0, i*_nItemWidth, _nBitmapHeight-1);
			for (int i=0;i<_nRows;i  )
				grfx.DrawLine(new Pen(HLinesColor), 0, i*_nItemHeight, _nBitmapWidth-1, i*_nItemHeight);
			
			grfx.DrawRectangle(new Pen(BorderColor), 0 ,0 , _nBitmapWidth-1, _nBitmapHeight-1);

			for (int i=0;i<_nColumns;i  )
				for (int j=0;j<_nRows ;j  )
					if ((j*_nColumns i) < imageList.Images.Count)
						imageList.Draw(grfx,
										i*_nItemWidth _nHSpace/2,
										j*_nItemHeight nVSpace/2,
										imageList.ImageSize.Width,
										imageList.ImageSize.Height,
										j*_nColumns i);

			return true;
		}
	
		public void Show(int x, int y)
		{
			this.Left = x;
			this.Top = y;
			base.Show();
		}
		#endregion

		#region Overrides
		protected override void OnMouseLeave(EventArgs ea)
		{
			// We repaint the popup if the mouse is no more over it
			base.OnMouseLeave(ea);
			_nCoordX = -1;
			_nCoordY = -1;
			Invalidate();
		}

		protected override void OnDeactivate(EventArgs ea)
		{
			// If the form loses focus, we hide it
			this.Hide();
		}

		protected override void OnKeyDown(KeyEventArgs kea)
		{
			if (_nCoordX==-1 || _nCoordY==-1)
			{
				_nCoordX = 0;
				_nCoordY = 0;
				Invalidate();
			}
			else
			{
				switch(kea.KeyCode)
				{
					case Keys.Down:
						if (_nCoordY<_nRows-1)
						{
							_nCoordY  ;
							Invalidate();
						}
						break;
					case Keys.Up:
						if (_nCoordY>0)
						{
							_nCoordY--;
							Invalidate();
						}
						break;
					case Keys.Right:
						if (_nCoordX<_nColumns-1)
						{
							_nCoordX  ;
							Invalidate();
						}
						break;
					case Keys.Left:
						if (_nCoordX>0)
						{
							_nCoordX--;
							Invalidate();
						}
						break;
					case Keys.Enter:
					case Keys.Space:
						// We fire the event only when the mouse is released
						int nImageId = _nCoordY*_nColumns   _nCoordX;
						if (ItemClick != null && nImageId>=0 && nImageId<_imageList.Images.Count)
						{
							ItemClick(this, new ImageListPopupEventArgs(nImageId));
							_nCoordX = -1;
							_nCoordY = -1;
							Hide();
						}
						break;
					case Keys.Escape:
						_nCoordX = -1;
						_nCoordY = -1;
						Hide();
						break;
				}
			}
		}

		protected override void OnMouseMove(MouseEventArgs mea)
		{
			// Update the popup only if the image selection has changed
			if (ClientRectangle.Contains(new Point(mea.X,mea.Y)))
			{
				if (EnableDragDrop && _bIsMouseDown)
				{
					int nImage = _nCoordY*_nColumns _nCoordX;
					DataObject data = new DataObject();
					data.SetData(DataFormats.Text,nImage.ToString());
					data.SetData(DataFormats.Bitmap,_imageList.Images[nImage]);
					DragDropEffects dde = DoDragDrop(data, DragDropEffects.Copy | DragDropEffects.Move);
					_bIsMouseDown = false;
				}

				if ( ((mea.X/_nItemWidth)!=_nCoordX) || ((mea.Y/_nItemHeight)!=_nCoordY) )
				{
					_nCoordX = mea.X/_nItemWidth;
					_nCoordY = mea.Y/_nItemHeight;
					Invalidate();
				}
			}
			else
			{
				_nCoordX = -1;
				_nCoordY = -1;
				Invalidate();
			}
			base.OnMouseMove(mea);
		}

		protected override void OnMouseDown(MouseEventArgs mea)
		{
			base.OnMouseDown(mea);
			_bIsMouseDown = true;
			Invalidate();
		}

		protected override void OnMouseUp(MouseEventArgs mea)
		{
			base.OnMouseDown(mea);
			_bIsMouseDown = false;
			
			// We fire the event only when the mouse is released
			int nImageId = _nCoordY*_nColumns   _nCoordX;
			if (ItemClick != null && nImageId>=0 && nImageId<_imageList.Images.Count)
			{
				ItemClick(this, new ImageListPopupEventArgs(nImageId));
				Hide();
			}
		}

		protected override void OnPaintBackground(PaintEventArgs pea)
		{
			Graphics grfx = pea.Graphics;
			grfx.PageUnit = GraphicsUnit.Pixel;
			
			// Basic double buffering technique
			Bitmap offscreenBitmap = new Bitmap(_nBitmapWidth, _nBitmapHeight);
			Graphics offscreenGrfx = Graphics.FromImage(offscreenBitmap);
			// We blit the precalculated bitmap on the offscreen Graphics
			offscreenGrfx.DrawImage(_Bitmap, 0, 0);

			if (_nCoordX!=-1 && _nCoordY!=-1 && (_nCoordY*_nColumns _nCoordX)<_imageList.Images.Count)
			{
				// We draw the selection rectangle
				offscreenGrfx.FillRectangle(new SolidBrush(BackgroundOverColor), _nCoordX*_nItemWidth   1, _nCoordY*_nItemHeight   1, _nItemWidth-1, _nItemHeight-1);
				if (_bIsMouseDown)
				{
					// Mouse Down aspect for the image
					_imageList.Draw(offscreenGrfx,
						_nCoordX*_nItemWidth   _nHSpace/2   1,
						_nCoordY*_nItemHeight   _nVSpace/2   1,
						_imageList.ImageSize.Width,
						_imageList.ImageSize.Height,
						_nCoordY*_nColumns   _nCoordX);
				}
				else
				{
					// Normal aspect for the image
					_imageList.Draw(offscreenGrfx,
						_nCoordX*_nItemWidth   _nHSpace/2,
						_nCoordY*_nItemHeight   _nVSpace/2,
						_imageList.ImageSize.Width,
						_imageList.ImageSize.Height,
						_nCoordY*_nColumns   _nCoordX);
				}
				// Border selection Rectangle
				offscreenGrfx.DrawRectangle(new Pen(BorderColor), _nCoordX*_nItemWidth, _nCoordY*_nItemHeight, _nItemWidth, _nItemHeight);
			}

			// We blit the offscreen image on the screen
			grfx.DrawImage(offscreenBitmap, 0, 0);
		}
		#endregion
	}
}