how to Invalidate Tab Control when the Form is Maximize ?

[loyal]

hi All

 

I do painting my Tab Control with Linear Brush

 

it works well but when the application is minimize then

 

Maximize the exception Handle with this message

 

An unhandled exception of type 'System.ArgumentException' occurred in system.windows.forms.dll

 

Additional information: Rectangle '{X=0,Y=0,Width=0,Height=0}' cannot have a width or height equal to zero.

 

then I know there's a method called

 

Invalidate()

 

but where should I use it

 

and should I use a Refresh() Method

 

or make no sense :D

 

anyone help please

[aewarnick]

Are you changing the size of the Brush on Form_Resized? If you are, just prevent the Brush from being created with a 0 Rectangle.

 

All Invalidate does is tell the Window or control to redraw itself.

I myself have never used Refresh, but I'm sure it has it's purpose.

[aewarnick]

I just saw your title more closely. Take a look at this Form class it probably does what you want and more. Ignore all the junk. At the bottom you will probably see the answer to your problem.

/// <summary>
		/// Inherits from Form and has additional features including the ability to center an image on the form at all times with transparency if you want. You can also paint the background with any brush you want.
		/// </summary>
		public class aForm : Form
		{

			/*public class FormBrush
			{
				public FormBrush(){}

				FormBrush FB=new FormBrush();
				public FormBrush Brush
				{
					get{return FB;}
					set{FB=value;}
				}
			}

			/// <summary>
			/// Colors the BackGround of the Form.
			/// </summary>
			[ TypeConverter(typeof(ExpandableObjectConverter)) ]
			public class brush
			{
				Color c1= a.Colors.aControl;
				Color c2= a.Colors.aControl;
				Rectangle fiStartEndArea=new Rectangle(0,0,100,100);
				int rot=20;
//-----------------------------
				public brush(Color color1, Color color2, Rectangle fillStartEndArea, int rotation)
				{
					Color1= color1;
					Color2= color2;
					FillStartEndArea= fillStartEndArea;
					Rotation= rotation;
				}

				public brush(Color color1)
				{
					Color1= color1;
					Color2= color1;
				}

				public brush()
				{
					
				}
//-----------------------------
				public Color Color1
				{
					get{return c1;}
					set{c1=value;}
				}
//-----------------------------
				public Color Color2
				{
					get{return c2;}
					set{c2=value;}
				}
//-----------------------------
				public Rectangle FillStartEndArea
				{
					get{return fiStartEndArea;}
					set{fiStartEndArea=value;}
				}
//-----------------------------
				public int Rotation
				{
					get{return rot;}
					set{rot=value;}
				}
			} //end class FormBrush
//----------------------------*/

			Brush backgrdBrush=null;
			Image backgrdImage=null;
			int backgrdImageTransp=100;
			bool controlsTransp=true;
			bool controlsTranspInclBut=false;

			/// <summary>
			/// If some controls are not being colored right you may be able to figure out why.
			/// </summary>
			public string Errors="Check to see if the FormBorderStyle is set to 3D.\n\n";

			/// <summary>
			/// A brush to paint the background any color you want. Will always be behind the image.
			/// </summary>
			public Brush BackgrdBrush
			{
				get{return backgrdBrush;}
				set{backgrdBrush=value; this.Invalidate();}
			}

			/// <summary>
			/// Places an image in the center of the form keeping its proportions.
			/// </summary>
			public Image BackgrdIm
			{
				get{return backgrdImage;}
				set{backgrdImage=value; this.Invalidate();}
			}

			/// <summary>
			/// Sets the transparency percent to the backgrdImage.  0 is clear.  If the image is not transparent at all the painting will draw faster: 100.
			/// </summary>
			public int BackgrdImTransp
			{
				get{return backgrdImageTransp;}
				set{backgrdImageTransp=value; this.Invalidate();}
			}

			/// <summary>
			/// Set to false if you want the controls on the form to take on the BackColor of the form.
			/// </summary>
			public bool ControlsTransp
			{
				get{return this.controlsTransp;}
				set{this.controlsTransp=value; this.Invalidate();}
			}

			/// <summary>
			/// You want your buttons to be transparent too.
			/// </summary>
			public bool ControlsTranspInclBut
			{
				get{return this.controlsTranspInclBut;}
				set{this.controlsTranspInclBut=value; this.Invalidate();}
			}

			//------------------------
			public aForm()
			{
				this.SetStyle(ControlStyles.DoubleBuffer, true);
				this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
				this.SetStyle(ControlStyles.UserPaint, true);

				this.BackColor= a.Colors.aControl;
			}
			//------------------------

			protected override void OnPaint(PaintEventArgs e)
			{
				e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
				base.OnPaint(e);

				if( (controlsTransp || controlsTranspInclBut) && (this.backgrdBrush != null || this.backgrdImage != null) )
				{
					if(controlsTranspInclBut)
					{
						foreach(Control c in this.Controls)
						{
							try
							{
								if(c is Label || c is GroupBox || c is Panel || c is LinkLabel || c is Button || c is CheckBox || c is RadioButton)
									((Control)c).BackColor= Color.FromArgb(0,0,0,0);
								/*else if(c is TabControl)
								{
									foreach(TabPage tp in ((TabControl)c).TabPages)
										tp.BackColor= Color.FromArgb(0,0,0,0);
								}*/
							}
							catch(Exception er) { this.Errors+= er+"\n\n"+c+"\n\n"; }
						}
					}
					else
					{
						ArrayList buttonsList= new ArrayList(2);
						ArrayList buttonsColorList= new ArrayList(2);

						foreach(Control c in this.Controls)
						{
							try
							{
								if(c is Label || c is GroupBox || c is Panel || c is LinkLabel || c is CheckBox || c is RadioButton)
									((Control)c).BackColor= Color.FromArgb(0,0,0,0);
						
								else if(c is TabControl)
								{
									foreach(TabPage tp in ((TabControl)c).TabPages)
									{
										foreach(Control tc in tp.Controls)
										{
											if(tc is Button)
											{
												buttonsList.Add(tc);
												buttonsColorList.Add(tc.BackColor);
											}
										}

										tp.BackColor= Color.FromArgb(0,0,0,0);
								
										for(int i=0; i<buttonsList.Count; i++)
										{
											((Button)buttonsList[i]).BackColor= ((Color)buttonsColorList[i]);
										}
									}
								}
							}
							catch(Exception er) { this.Errors+= er+"\n\n"+c+"\n\n"; }
						}
					}
				}

				try
				{
					if(this.backgrdBrush != null)
					{
						//LinearGradientBrush LGB=new LinearGradientBrush(this.backgrdBrush.FillStartEndArea, this.backgrdBrush.Color1, this.backgrdBrush.Color2, this.backgrdBrush.Rotation);
						e.Graphics.FillRectangle(this.backgrdBrush, this.ClientRectangle);
					}

					if(this.backgrdImage != null)
					{
						Size ImSize= a.graphics.ProportionalSize(backgrdImage.Size, new Size(this.ClientRectangle.Width, this.ClientRectangle.Height));

						Rectangle centerR= a.graphics.CenterRect(this.ClientRectangle, ImSize);

						if(this.backgrdImageTransp != 100)
						{
							ImageAttributes IA = a.graphics.TrasparentImage(backgrdImageTransp);
							e.Graphics.DrawImage(backgrdImage, centerR, 0, 0, backgrdImage.Size.Width, backgrdImage.Size.Height, GraphicsUnit.Pixel, IA);
						}
						else
							e.Graphics.DrawImage(backgrdImage, centerR, 0, 0, backgrdImage.Size.Width, backgrdImage.Size.Height, GraphicsUnit.Pixel);
					}
				}
				catch(Exception er) { this.Errors += er+"\n\n"; }
			}
			//-------------------
			protected override void OnResize(EventArgs e)
			{
				base.OnResize(e);

				if(this.backgrdBrush != null || this.backgrdImage != null)
					this.Invalidate();
			}
		
		}

[loyal]

hi in fact I didn't get it well as you read my Q

 

this is the code I've written to paint the Tab control

 

Private Sub tabTables_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs)
       Dim g As Graphics = e.Graphics
       Dim lBrush As LinearGradientBrush = New _
        LinearGradientBrush(Me.ClientRectangle, Color.MediumBlue, _
        Color.RoyalBlue, LinearGradientMode.BackwardDiagonal)
       g.FillRectangle(lBrush, Me.ClientRectangle)

   End Sub

 

 

and I added a handler in Form Load

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
       AddHandler tb.Paint, AddressOf tabTables_Paint

   End Sub

 

 

now What should I do to solve repaint when the Form Is Maximize ?

 

I hope it clear

[aewarnick]

It's in my code above. In Resize call Invalidate();

[loyal]

I am quite sorry , i do both but the exception still exist

 

Private Sub Form1_Resize(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Resize
       Me.Invalidate()
       Me.tb.Invalidate()

   End Sub

   Protected Overrides Sub OnResize(ByVal e As System.EventArgs)
       Me.Invalidate()
       Me.tb.Invalidate()

   End Sub

 

 

neither help

[aewarnick]

When you override, you must call the base class.

 

You are also overriding the Form's OnResize not the TabControls.

You must make a custom TabControl inheriting form TabControl.

public class TB : TabControl
{
}

 

Remember to check for an empty Rectangle. One with (anything, anything, 0, 0).