inertbutton.cs

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// *****************************************************************************
// 
//  Copyright 2004, Weifen Luo
//  All rights reserved. The software and associated documentation 
//  supplied hereunder are the proprietary information of Weifen Luo
//  and are supplied subject to licence terms.
// 
//  WinFormsUI Library Version 1.0
// *****************************************************************************

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

namespace WeifenLuo.WinFormsUI
{
	public class InertButton : Control
	{
		private IContainer components = new Container();
		private int m_borderWidth = 1;
		private bool m_mouseOver = false;
		private bool m_mouseCapture = false;
		private bool m_isPopup = false;
		private Image m_imageEnabled = null;
		private Image m_imageDisabled = null;
		private ImageList m_imageList = null;
		private int m_imageIndexEnabled = -1;
		private int m_imageIndexDisabled = -1;
		private bool m_monochrom = true;
		private ContentAlignment m_textAlign = ContentAlignment.MiddleCenter;
		private ToolTip m_toolTip = null;
		private string m_toolTipText = "";
		private Color m_borderColor = Color.Empty;

		public InertButton()
		{
			InternalConstruct(null, null);
		}

		public InertButton(Image imageEnabled)
		{
			InternalConstruct(imageEnabled, null);
		}

		public InertButton(Image imageEnabled, Image imageDisabled)
		{
			InternalConstruct(imageEnabled, imageDisabled);
		}
		
		private void InternalConstruct(Image imageEnabled, Image imageDisabled)
		{
			// Remember parameters
			ImageEnabled = imageEnabled;
			ImageDisabled = imageDisabled;

			// Prevent drawing flicker by blitting from memory in WM_PAINT
			SetStyle(ControlStyles.ResizeRedraw, true);
			SetStyle(ControlStyles.UserPaint, true);
			SetStyle(ControlStyles.AllPaintingInWmPaint, true);
			SetStyle(ControlStyles.DoubleBuffer, true);

			// Prevent base class from trying to generate double click events and
			// so testing clicks against the double click time and rectangle. Getting
			// rid of this allows the user to press then release button very quickly.
			SetStyle(ControlStyles.StandardDoubleClick, false);

			// Should not be allowed to select this control
			SetStyle(ControlStyles.Selectable, false);
		}

		protected override void Dispose(bool disposing)
		{
			if (disposing)
			{
				if (components != null)
					components.Dispose();
			}
			base.Dispose(disposing);
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.BorderColor.Description")]
		public Color BorderColor
		{
			get	{	return m_borderColor;	}
			set
			{
				if (m_borderColor != value)
				{
					m_borderColor = value;
					Invalidate();
				}
			}
		}

		private bool ShouldSerializeBorderColor()
		{
			return (m_borderColor != Color.Empty);
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.BorderWidth.Description")]
		[DefaultValue(1)]
		public int BorderWidth
		{
			get { return m_borderWidth; }

			set
			{
				if (value < 1)
					value = 1;
				if (m_borderWidth != value)
				{
					m_borderWidth = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.ImageEnabled.Description")]
		[DefaultValue(null)]
		public Image ImageEnabled
		{
			get
			{ 
				if (m_imageEnabled != null)
					return m_imageEnabled;

				try
				{
					if (m_imageList == null || m_imageIndexEnabled == -1)
						return null;
					else
						return m_imageList.Images[m_imageIndexEnabled];
				}
				catch
				{
					return null;
				}
			}

			set
			{
				if (m_imageEnabled != value)
				{
					m_imageEnabled = value;
					Invalidate();
				}
			}
		}

		private bool ShouldSerializeImageEnabled()
		{
			return (m_imageEnabled != null);
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.ImageDisabled.Description")]
		[DefaultValue(null)]
		public Image ImageDisabled
		{
			get
			{
				if (m_imageDisabled != null)
					return m_imageDisabled;

				try
				{
					if (m_imageList == null || m_imageIndexDisabled == -1)
						return null;
					else
						return m_imageList.Images[m_imageIndexDisabled];
				}
				catch
				{
					return null;
				}
			}

			set
			{
				if (m_imageDisabled != value)
				{
					m_imageDisabled = value;
					Invalidate();
				}
			}
		}

		private bool ShouldSerializeImageDisabled()
		{
			return (m_imageDisabled != null);
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.ImageList.Description")]
		[DefaultValue(null)]
		[RefreshProperties(RefreshProperties.Repaint)]
		public ImageList ImageList
		{
			get	{	return m_imageList;	}
			set
			{
				if (m_imageList != value)
				{
					m_imageList = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.ImageIndexEnabled.Description")]
		[DefaultValue(-1)]
		[Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design", "System.Drawing.Design.UITypeEditor,System.Drawing")]
		[TypeConverter(typeof(System.Windows.Forms.ImageIndexConverter))]
		[RefreshProperties(RefreshProperties.Repaint)]
		public int ImageIndexEnabled
		{
			get	{	return m_imageIndexEnabled;	}
			set
			{
				if (m_imageIndexEnabled != value)
				{
					m_imageIndexEnabled = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.ImageIndexDisabled.Description")]
		[DefaultValue(-1)]
		[Editor("System.Windows.Forms.Design.ImageIndexEditor, System.Design", "System.Drawing.Design.UITypeEditor,System.Drawing")]
		[TypeConverter(typeof(System.Windows.Forms.ImageIndexConverter))]
		[RefreshProperties(RefreshProperties.Repaint)]
		public int ImageIndexDisabled
		{
			get	{	return m_imageIndexDisabled;	}
			set
			{
				if (m_imageIndexDisabled != value)
				{
					m_imageIndexDisabled = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.IsPopup.Description")]
		[DefaultValue(false)]
		public bool IsPopup
		{
			get { return m_isPopup; }

			set
			{
				if (m_isPopup != value)
				{
					m_isPopup = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.Monochrom.Description")]
		[DefaultValue(true)]
		public bool Monochrome
		{
			get	{	return m_monochrom;	}
			set
			{
				if (value != m_monochrom)
				{
					m_monochrom = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.TextAlign.Description")]
		[DefaultValue(ContentAlignment.MiddleCenter)]
		public ContentAlignment TextAlign
		{
			get	{	return m_textAlign;	}
			set
			{
				if (m_textAlign != value)
				{
					m_textAlign = value;
					Invalidate();
				}
			}
		}

		[Category("Appearance")]
		[LocalizedDescription("InertButton.ToolTipText.Description")]
		[DefaultValue("")]
		public string ToolTipText
		{
			get	{	return m_toolTipText;	}
			set
			{
				if (m_toolTipText != value)
				{
					if (m_toolTip == null)
						m_toolTip = new ToolTip(this.components);
					m_toolTipText = value;
					m_toolTip.SetToolTip(this, value);
				}
			}
		}

		protected override void OnMouseDown(MouseEventArgs e)
		{
			base.OnMouseDown(e);

			if (e.Button != MouseButtons.Left)
				return;

			if (m_mouseCapture == false || m_mouseOver == false)
			{
				m_mouseCapture = true;
				m_mouseOver = true;

				//Redraw to show button state
				Invalidate();
			}
		}

		protected override void OnMouseUp(MouseEventArgs e)
		{
			base.OnMouseUp(e);

			if (e.Button != MouseButtons.Left)
				return;

			if (m_mouseOver == true || m_mouseCapture == true)
			{
				m_mouseOver = false;
				m_mouseCapture = false;

				// Redraw to show button state
				Invalidate();
			}

			base.OnMouseUp(e);
		}

		protected override void OnMouseMove(MouseEventArgs e)
		{
			base.OnMouseMove(e);

			// Is mouse point inside our client rectangle
			bool over = this.ClientRectangle.Contains(new Point(e.X, e.Y));

			// If entering the button area or leaving the button area...
			if (over != m_mouseOver)
			{
				// Update state
				m_mouseOver = over;

				// Redraw to show button state
				Invalidate();
			}
		}

		protected override void OnMouseEnter(EventArgs e)
		{
			// Update state to reflect mouse over the button area
			if (!m_mouseOver)
			{
				m_mouseOver = true;

				// Redraw to show button state
				Invalidate();
			}

			base.OnMouseEnter(e);
		}

		protected override void OnMouseLeave(EventArgs e)
		{
			// Update state to reflect mouse not over the button area
			if (m_mouseOver)
			{
				m_mouseOver = false;

				// Redraw to show button state
				Invalidate();
			}

			base.OnMouseLeave(e);
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e);
			DrawImage(e.Graphics);
			DrawText(e.Graphics);
			DrawBorder(e.Graphics);
		}

		private void DrawImage(Graphics g)
		{
			Image image = this.Enabled ? ImageEnabled : ((ImageDisabled != null) ? ImageDisabled : ImageEnabled);
			ImageAttributes imageAttr = null;

			if (null == image)
				return;

			if (m_monochrom)
			{
				imageAttr = new ImageAttributes();

				// transform the monochrom image
				// white -> BackColor
				// black -> ForeColor
				ColorMap[] colorMap = new ColorMap[2];
				colorMap[0] = new ColorMap();
				colorMap[0].OldColor = Color.White;
				colorMap[0].NewColor = this.BackColor;
				colorMap[1] = new ColorMap();
				colorMap[1].OldColor = Color.Black;
				colorMap[1].NewColor = this.ForeColor;
				imageAttr.SetRemapTable(colorMap);
			}

			Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);

			if ((!Enabled) && (null == ImageDisabled))
			{
				using (Bitmap bitmapMono = new Bitmap(image, ClientRectangle.Size))
				{
					if (imageAttr != null)
					{
						using (Graphics gMono = Graphics.FromImage(bitmapMono))
						{
							gMono.DrawImage(image, new Point[3] { new Point(0, 0), new Point(image.Width - 1, 0), new Point(0, image.Height - 1) }, rect, GraphicsUnit.Pixel, imageAttr);
						}
					}
					ControlPaint.DrawImageDisabled(g, bitmapMono, 0, 0, this.BackColor);
				}
			}
			else
			{
				// Three points provided are upper-left, upper-right and 
				// lower-left of the destination parallelogram. 
				Point[] pts = new Point[3];
				pts[0].X = (Enabled && m_mouseOver && m_mouseCapture) ? 1 : 0;
				pts[0].Y = (Enabled && m_mouseOver && m_mouseCapture) ? 1 : 0;
				pts[1].X = pts[0].X + ClientRectangle.Width;
				pts[1].Y = pts[0].Y;
				pts[2].X = pts[0].X;
				pts[2].Y = pts[1].Y + ClientRectangle.Height;

				if (imageAttr == null)
					g.DrawImage(image, pts, rect, GraphicsUnit.Pixel);
				else
					g.DrawImage(image, pts, rect, GraphicsUnit.Pixel, imageAttr);
			}
		}	

		private void DrawText(Graphics g)
		{
			if (Text == string.Empty)
				return;

			Rectangle rect = ClientRectangle;

			rect.X += BorderWidth;
			rect.Y += BorderWidth;
			rect.Width -= 2 * BorderWidth;
			rect.Height -= 2 * BorderWidth;

			StringFormat stringFormat = new StringFormat();

			if (TextAlign == ContentAlignment.TopLeft)
			{
				stringFormat.Alignment = StringAlignment.Near;
				stringFormat.LineAlignment = StringAlignment.Near;
			}
			else if (TextAlign == ContentAlignment.TopCenter)
			{
				stringFormat.Alignment = StringAlignment.Center;
				stringFormat.LineAlignment = StringAlignment.Near;
			}
			else if (TextAlign == ContentAlignment.TopRight)
			{
				stringFormat.Alignment = StringAlignment.Far;
				stringFormat.LineAlignment = StringAlignment.Near;
			}
			else if (TextAlign == ContentAlignment.MiddleLeft)
			{
				stringFormat.Alignment = StringAlignment.Near;
				stringFormat.LineAlignment = StringAlignment.Center;
			}
			else if (TextAlign == ContentAlignment.MiddleCenter)
			{
				stringFormat.Alignment = StringAlignment.Center;
				stringFormat.LineAlignment = StringAlignment.Center;
			}
			else if (TextAlign == ContentAlignment.MiddleRight)
			{
				stringFormat.Alignment = StringAlignment.Far;
				stringFormat.LineAlignment = StringAlignment.Center;
			}
			else if (TextAlign == ContentAlignment.BottomLeft)
			{
				stringFormat.Alignment = StringAlignment.Near;
				stringFormat.LineAlignment = StringAlignment.Far;
			}
			else if (TextAlign == ContentAlignment.BottomCenter)
			{
				stringFormat.Alignment = StringAlignment.Center;
				stringFormat.LineAlignment = StringAlignment.Far;
			}
			else if (TextAlign == ContentAlignment.BottomRight)
			{
				stringFormat.Alignment = StringAlignment.Far;
				stringFormat.LineAlignment = StringAlignment.Far;
			}

			using (Brush brush = new SolidBrush(ForeColor))
			{
				g.DrawString(Text, Font, brush, rect, stringFormat);
			}
		}

		private void DrawBorder(Graphics g)
		{
			ButtonBorderStyle bs;

			// Decide on the type of border to draw around image
			if (!this.Enabled)
				bs = m_isPopup ? ButtonBorderStyle.Outset : ButtonBorderStyle.Solid;
			else if (m_mouseOver && m_mouseCapture)
				bs = ButtonBorderStyle.Inset;
			else if (m_isPopup || m_mouseOver)
				bs = ButtonBorderStyle.Outset;
			else
				bs = ButtonBorderStyle.Solid;

			Color colorLeftTop;
			Color colorRightBottom;
			if (bs == ButtonBorderStyle.Solid)
			{
				colorLeftTop = this.BackColor;
				colorRightBottom = this.BackColor;
			}
			else if (bs == ButtonBorderStyle.Outset)
			{
				colorLeftTop = m_borderColor.IsEmpty ? this.BackColor : m_borderColor;
				colorRightBottom = this.BackColor;
			}
			else
			{
				colorLeftTop = this.BackColor;
				colorRightBottom = m_borderColor.IsEmpty ? this.BackColor : m_borderColor;
			}
			ControlPaint.DrawBorder(g, this.ClientRectangle,
				colorLeftTop, m_borderWidth, bs,
				colorLeftTop, m_borderWidth, bs,
				colorRightBottom, m_borderWidth, bs,
				colorRightBottom, m_borderWidth, bs);
		}

		protected override void OnEnabledChanged(EventArgs e)
		{
			base.OnEnabledChanged(e);
			if (Enabled == false)
			{
				m_mouseOver = false;
				m_mouseCapture = false;
			}
			Invalidate();
		}
	}
}