VScrollBar.LargeChange : VScrollBar « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. VScrollBar

VScrollBar.LargeChange

  

using System;
using System.Drawing;
using System.Windows.Forms;
   
class ColorScrollDialogBox: Form
{
     Label[]      alabelName  = new Label[3];
     Label[]      alabelValue = new Label[3];
     VScrollBar[] avscroll    = new VScrollBar[3];
   
     public event EventHandler Changed;
   
     public ColorScrollDialogBox()
     {
          Color[] acolor = { Color.Red, Color.Green, Color.Blue };
   
          for (int i = 0; i < 3; i++)
          {
               alabelName[i] = new Label();
               alabelName[i].Parent = this;
               alabelName[i].ForeColor = acolor[i];
               alabelName[i].Text = "&" + acolor[i].ToKnownColor();
               alabelName[i].TextAlign = ContentAlignment.MiddleCenter;
   
               avscroll[i] = new VScrollBar();
               avscroll[i].Parent = this;
               avscroll[i].SmallChange = 1;
               avscroll[i].LargeChange = 16;
               avscroll[i].Minimum  = 0;
               avscroll[i].Maximum = 255 + avscroll[i].LargeChange - 1;
               avscroll[i].ValueChanged +=  new EventHandler(ScrollOnValueChanged);
               avscroll[i].TabStop = true;
   
               alabelValue[i] = new Label();
               alabelValue[i].Parent = this;
               alabelValue[i].TextAlign = ContentAlignment.MiddleCenter;
          }
   
          OnResize(EventArgs.Empty);
     }
     public Color Color
     {
          get 
          { 
               return Color.FromArgb(avscroll[0].Value,
                                     avscroll[1].Value,
                                     avscroll[2].Value); 
          }
          set 
          {
               avscroll[0].Value = value.R;
               avscroll[1].Value = value.G;
               avscroll[2].Value = value.B;
          }
     }
     protected override void OnResize(EventArgs ea)
     {
          base.OnResize(ea);
   
          int cx = ClientSize.Width;
          int cy = ClientSize.Height;
          int cyFont = Font.Height;
   
          for (int i = 0; i < 3; i++)
          {
               alabelName[i].Location = new Point(i * cx / 3, cyFont / 2);
               alabelName[i].Size = new Size(cx / 3, cyFont);
               avscroll[i].Location = new Point((4 * i + 1) * cx / 12,2 * cyFont);
               avscroll[i].Size = new Size(cx / 6, cy - 4 * cyFont);
               alabelValue[i].Location = new Point(i * cx / 3,cy - 3 * cyFont / 2);
               alabelValue[i].Size = new Size(cx / 3, cyFont);
          }
     }
     void ScrollOnValueChanged(Object obj, EventArgs ea)
     {
          for (int i = 0; i < 3; i++)
               if((VScrollBar) obj == avscroll[i])
                    alabelValue[i].Text = avscroll[i].Value.ToString();
          if (Changed != null)
               Changed(this, new EventArgs());
     }
}

   
class ModelessColorScroll: Form
{
     public static void Main()
     {
          Application.Run(new ModelessColorScroll());
     }
     public ModelessColorScroll()
     {
          ColorScrollDialogBox dlg = new ColorScrollDialogBox();
          
          dlg.Owner = this;
          dlg.Color = BackColor;
          dlg.Changed += new EventHandler(ColorScrollOnChanged);
          dlg.Show();
     }
     void ColorScrollOnChanged(object obj, EventArgs ea)
     {
          ColorScrollDialogBox dlg = (ColorScrollDialogBox) obj;
   
          BackColor = dlg.Color;
     }
}

   
    
  

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