Switch-Toolbox/Switch_Toolbox_Library/Forms/Custom/FlatTabControl/FlatTabControl.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Data;
using System.Windows.Forms;
using System.Drawing.Design;
using System.ComponentModel.Design;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;
using Toolbox.Library.Forms;
using System.Windows.Forms;

namespace FlatTabControl
{
	/// <summary>
	/// Summary description for FlatTabControl.
	/// </summary>
	[ToolboxBitmap(typeof(System.Windows.Forms.TabControl))] //,
		//Designer(typeof(Designers.FlatTabControlDesigner))]
	
	public class FlatTabControl : System.Windows.Forms.TabControl
	{

		/// <summary> 
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private SubClass scUpDown = null;
		private bool bUpDown; // true when the button UpDown is required
		private ImageList leftRightImages = null;
		private const int nMargin = 5;
		private Color mBackColor = Color.Empty;
        private Color mShadowColor = Color.Empty;

        public FlatTabControl()
		{
            myBackColor = FormThemes.BaseTheme.FormBackColor;

            // This call is required by the Windows.Forms Form Designer.
            InitializeComponent();

			// double buffering
			this.SetStyle(ControlStyles.UserPaint, true);
			this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
			this.SetStyle(ControlStyles.DoubleBuffer, true);
			this.SetStyle(ControlStyles.ResizeRedraw, true);
			this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);


            bUpDown = false;

			this.ControlAdded += new ControlEventHandler(FlatTabControl_ControlAdded);
			this.ControlRemoved += new ControlEventHandler(FlatTabControl_ControlRemoved);
			this.SelectedIndexChanged += new EventHandler(FlatTabControl_SelectedIndexChanged);

			leftRightImages = new ImageList();
			//leftRightImages.ImageSize = new Size(16, 16); // default

			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(FlatTabControl));
			Bitmap updownImage = ((System.Drawing.Bitmap)(resources.GetObject("TabIcons.bmp")));
			
			if (updownImage != null)
			{
				updownImage.MakeTransparent(Color.White);
			leftRightImages.Images.AddStrip(updownImage);
			}

            Refresh();
		}

        protected override void OnSizeChanged(EventArgs e)
        {
            FindUpDown();
            UpdateUpDown();

            base.OnSizeChanged(e);
        }

        /// <summary> 
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}

				leftRightImages.Dispose();
			}
			base.Dispose( disposing );
		}

        protected override void OnPaint(PaintEventArgs e)
		{
			base.OnPaint(e); 
			
			DrawControl(e.Graphics);
		}

		internal void DrawControl(Graphics g)
		{
			if (!Visible)
				return;

            Rectangle TabControlArea = this.ClientRectangle;
			Rectangle TabArea = this.DisplayRectangle;

			//----------------------------
			// fill client area
			Brush br = new SolidBrush(mBackColor); //(SystemColors.Control); UPDATED
			g.FillRectangle(br, TabControlArea);
			br.Dispose();


			//----------------------------

			//----------------------------
			// draw border
			int nDelta = SystemInformation.Border3DSize.Width;

			Pen border = new Pen(mShadowColor);
			TabArea.Inflate(nDelta, nDelta);
			g.DrawRectangle(border, TabArea);
			border.Dispose();
            //----------------------------

            //----------------------------
            // clip region for drawing tabs
            Region rsaved = g.Clip;
			Rectangle rreg;

			int nWidth = TabArea.Width + nMargin;
			if (bUpDown)
			{
				// exclude updown control for painting
				if (Win32.IsWindowVisible(scUpDown.Handle))
				{
					Rectangle rupdown = new Rectangle();
					Win32.GetWindowRect(scUpDown.Handle, ref rupdown);
					Rectangle rupdown2 = this.RectangleToClient(rupdown);

					nWidth = rupdown2.X;
				}
			}

			rreg = new Rectangle(TabArea.Left, TabControlArea.Top, nWidth - nMargin, TabControlArea.Height);

			g.SetClip(rreg);

			// draw tabs
			for (int i = 0; i < this.TabCount; i++)
				DrawTab(g, this.TabPages[i], i);

			g.Clip = rsaved;
			//----------------------------


			//----------------------------
			// draw background to cover flat border areas
			if (this.SelectedTab != null)
			{
				TabPage tabPage = this.SelectedTab;
                tabPage.BackColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TabPageActive;

                Color color = tabPage.BackColor;
				border = new Pen(color);
				
				TabArea.Offset(1, 1);
				TabArea.Width -= 2;
				TabArea.Height -= 2;
				
				g.DrawRectangle(border, TabArea);
				TabArea.Width -= 1;
				TabArea.Height -= 1;
				g.DrawRectangle(border, TabArea);

				border.Dispose();
			}
			//----------------------------
		}

        private const int WM_SETREDRAW = 11;

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);

        private void UpdateTabColor()
        {

            foreach (TabPage tpCheck in TabPages)
            {
                tpCheck.BackColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TabPageInactive;
                tpCheck.ForeColor = Toolbox.Library.Forms.FormThemes.BaseTheme.DisabledItemColor;
            }

            if (SelectedTab != null)
            {
                SelectedTab.BackColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TabPageActive;
                SelectedTab.ForeColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TextForeColor;
            }

            this.Refresh();
        }

        internal void DrawTab(Graphics g, TabPage tabPage, int nIndex)
		{
            Rectangle recBounds = this.GetTabRect(nIndex);
			RectangleF tabTextArea = (RectangleF)this.GetTabRect(nIndex);

			bool bSelected = (this.SelectedIndex == nIndex);

			Point[] pt = new Point[7];
			if (this.Alignment == TabAlignment.Top)
			{
				pt[0] = new Point(recBounds.Left, recBounds.Bottom);
				pt[1] = new Point(recBounds.Left, recBounds.Top + 3);
				pt[2] = new Point(recBounds.Left + 3, recBounds.Top);
				pt[3] = new Point(recBounds.Right - 3, recBounds.Top);
				pt[4] = new Point(recBounds.Right, recBounds.Top + 3);
				pt[5] = new Point(recBounds.Right, recBounds.Bottom);
				pt[6] = new Point(recBounds.Left, recBounds.Bottom);
			}
			else
			{
				pt[0] = new Point(recBounds.Left, recBounds.Top);
				pt[1] = new Point(recBounds.Right, recBounds.Top);
				pt[2] = new Point(recBounds.Right, recBounds.Bottom - 3);
				pt[3] = new Point(recBounds.Right - 3, recBounds.Bottom);
				pt[4] = new Point(recBounds.Left + 3, recBounds.Bottom);
				pt[5] = new Point(recBounds.Left, recBounds.Bottom - 3);
				pt[6] = new Point(recBounds.Left, recBounds.Top);
			}

			//----------------------------
			// fill this tab with background color
			Brush br = new SolidBrush(tabPage.BackColor);
			g.FillPolygon(br, pt);
			br.Dispose();
			//----------------------------

			//----------------------------
			// draw border
			//g.DrawRectangle(SystemPens.ControlDark, recBounds);
			g.DrawPolygon(new Pen(Color.FromArgb(30,30,30)), pt);

			if (bSelected)
			{
				//----------------------------
				// clear bottom lines
				Pen pen = new Pen(tabPage.BackColor);

				switch (this.Alignment)
				{
					case TabAlignment.Top:
						g.DrawLine(pen, recBounds.Left + 1, recBounds.Bottom, recBounds.Right - 1, recBounds.Bottom);
						g.DrawLine(pen, recBounds.Left + 1, recBounds.Bottom+1, recBounds.Right - 1, recBounds.Bottom+1);
						break;

					case TabAlignment.Bottom:
						g.DrawLine(pen, recBounds.Left + 1, recBounds.Top, recBounds.Right - 1, recBounds.Top);
						g.DrawLine(pen, recBounds.Left + 1, recBounds.Top-1, recBounds.Right - 1, recBounds.Top-1);
						g.DrawLine(pen, recBounds.Left + 1, recBounds.Top-2, recBounds.Right - 1, recBounds.Top-2);
						break;
				}
				
				pen.Dispose();
				//----------------------------
			}
			//----------------------------

			//----------------------------
			// draw tab's icon
			if ((tabPage.ImageIndex >= 0) && (ImageList != null) && (ImageList.Images[tabPage.ImageIndex] != null))
			{
				int nLeftMargin = 8;
				int nRightMargin = 2;

				Image img = ImageList.Images[tabPage.ImageIndex];
				
				Rectangle rimage = new Rectangle(recBounds.X + nLeftMargin, recBounds.Y + 1, img.Width, img.Height);
				
				// adjust rectangles
				float nAdj = (float)(nLeftMargin + img.Width + nRightMargin);

				rimage.Y += (recBounds.Height - img.Height) / 2;
				tabTextArea.X += nAdj;
				tabTextArea.Width -= nAdj;

				// draw icon
				g.DrawImage(img, rimage);
			}
			//----------------------------

			//----------------------------
			// draw string
			StringFormat stringFormat = new StringFormat();
			stringFormat.Alignment = StringAlignment.Center;  
			stringFormat.LineAlignment = StringAlignment.Center;

			br = new SolidBrush(tabPage.ForeColor);

			g.DrawString(tabPage.Text, Font, br, tabTextArea, stringFormat);
			//----------------------------
		}

		internal void DrawIcons(Graphics g)
		{
			if ((leftRightImages == null) || (leftRightImages.Images.Count != 4))
				return;

			//----------------------------
			// calc positions
			Rectangle TabControlArea = this.ClientRectangle;

			Rectangle r0 = new Rectangle();
			Win32.GetClientRect(scUpDown.Handle, ref r0);

			Brush br = new SolidBrush(mBackColor);
			g.FillRectangle(br, r0);
			br.Dispose();
			
			Pen border = new Pen(mShadowColor);
			Rectangle rborder = r0;
			rborder.Inflate(-1, -1);
			g.DrawRectangle(border, rborder);
			border.Dispose();

			int nMiddle = (r0.Width / 2);
			int nTop = (r0.Height - 16) / 2;
			int nLeft = (nMiddle - 16) / 2;

			Rectangle r1 = new Rectangle(nLeft, nTop, 16, 16);
			Rectangle r2 = new Rectangle(nMiddle+nLeft, nTop, 16, 16);
			//----------------------------

			//----------------------------
			// draw buttons
			Image img = leftRightImages.Images[1];
			if (img != null)
			{
				if (this.TabCount > 0)
				{
					Rectangle r3 = this.GetTabRect(0);
					if (r3.Left < TabControlArea.Left)
						g.DrawImage(img, r1);
					else
					{
						img = leftRightImages.Images[3];
						if (img != null)
							g.DrawImage(img, r1);
					}
				}
			}

			img = leftRightImages.Images[0];
			if (img != null)
			{
				if (this.TabCount > 0)
				{
					Rectangle r3 = this.GetTabRect(this.TabCount - 1);
					if (r3.Right > (TabControlArea.Width - r0.Width))
						g.DrawImage(img, r2);
					else
					{
						img = leftRightImages.Images[2];
						if (img != null)
							g.DrawImage(img, r2);
					}
				}
			}
			//----------------------------
		}

		protected override void OnCreateControl()
		{
			base.OnCreateControl();

			FindUpDown();
		}

		private void FlatTabControl_ControlAdded(object sender, ControlEventArgs e)
		{
			FindUpDown();
			UpdateUpDown();
            UpdateTabColor();
        }

		private void FlatTabControl_ControlRemoved(object sender, ControlEventArgs e)
		{
			FindUpDown();
			UpdateUpDown();
		}

		private void FlatTabControl_SelectedIndexChanged(object sender, EventArgs e)
		{
			UpdateUpDown();
			Invalidate();	// we need to update border and background colors
		}

		private void FindUpDown()
		{
			bool bFound = false;

			// find the UpDown control
			IntPtr pWnd = Win32.GetWindow(this.Handle, Win32.GW_CHILD);
			
			while (pWnd != IntPtr.Zero)
			{
				//----------------------------
				// Get the window class name
				char[] className = new char[33];

				int length = Win32.GetClassName(pWnd, className, 32);

				string s = new string(className, 0, length);
				//----------------------------

				if (s == "msctls_updown32")
				{
					bFound = true;

					if (!bUpDown)
					{
						//----------------------------
						// Subclass it
						this.scUpDown = new SubClass(pWnd, true);
						this.scUpDown.SubClassedWndProc += new SubClass.SubClassWndProcEventHandler(scUpDown_SubClassedWndProc);
						//----------------------------

						bUpDown = true;
					}
					break;
				}
				
				pWnd = Win32.GetWindow(pWnd, Win32.GW_HWNDNEXT);
			}

			if ((!bFound) && (bUpDown))
				bUpDown = false;
		}

		private void UpdateUpDown()
		{
			if (bUpDown)
			{
				if (Win32.IsWindowVisible(scUpDown.Handle))
				{
					Rectangle rect = new Rectangle();

					Win32.GetClientRect(scUpDown.Handle, ref rect);
					Win32.InvalidateRect(scUpDown.Handle, ref rect, true);
				}
			}
		}

		#region scUpDown_SubClassedWndProc Event Handler

		private int scUpDown_SubClassedWndProc(ref Message m) 
		{
			switch (m.Msg)
			{
				case Win32.WM_PAINT:
				{
					//------------------------
					// redraw
					IntPtr hDC = Win32.GetWindowDC(scUpDown.Handle);
					Graphics g = Graphics.FromHdc(hDC);

					DrawIcons(g);

					g.Dispose();
					Win32.ReleaseDC(scUpDown.Handle, hDC);
					//------------------------

					// return 0 (processed)
					m.Result = IntPtr.Zero;

					//------------------------
					// validate current rect
					Rectangle rect = new Rectangle();

					Win32.GetClientRect(scUpDown.Handle, ref rect);
					Win32.ValidateRect(scUpDown.Handle, ref rect);
					//------------------------
				}
				return 1;
			}

			return 0;
		}
		#endregion

		#region Component Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify 
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
            this.SuspendLayout();
            // 
            // FlatTabControl
            // 
            this.Selected += new System.Windows.Forms.TabControlEventHandler(this.FlatTabControl_Selected);
            this.ResumeLayout(false);

		}


		#endregion

		#region Properties
		
		[Editor(typeof(TabpageExCollectionEditor), typeof(UITypeEditor))]
		public new TabPageCollection TabPages
		{
			get
			{
				return base.TabPages;
			}
		}

		new public TabAlignment Alignment
		{
			get {return base.Alignment;}
			set {
				TabAlignment ta = value;
				if ((ta != TabAlignment.Top) && (ta != TabAlignment.Bottom))
					ta = TabAlignment.Top;
				
				base.Alignment = ta;}
		}

		[Browsable(false)]
		new public bool Multiline
		{
			get {return base.Multiline;}
			set {base.Multiline = false;}
		}

		[Browsable(true)]
		new public Color myBackColor
		{
			get {return mBackColor;}
			set {mBackColor = value; this.Invalidate();}
		}

		#endregion

		#region TabpageExCollectionEditor

		internal class TabpageExCollectionEditor : CollectionEditor
		{
			public TabpageExCollectionEditor(System.Type type): base(type)
			{
			}
            
			protected override Type CreateCollectionItemType()
			{
				return typeof(TabPage);
			}
		}

        #endregion

        private void FlatTabControl_Selected(object sender, TabControlEventArgs e)
        {
            foreach (TabPage tpCheck in TabPages)
            {
                tpCheck.BackColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TabPageInactive;
                tpCheck.ForeColor = Toolbox.Library.Forms.FormThemes.BaseTheme.DisabledItemColor;
            }

            if (SelectedTab != null)
            {
                SelectedTab.BackColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TabPageActive;
                SelectedTab.ForeColor = Toolbox.Library.Forms.FormThemes.BaseTheme.TextForeColor;
            }
        }
    }

	//#endregion
}