Scrolllabel - Horizontal scrollendes Label

Beschreibung:

Ein Label das (ähnlich wie der "Marquee" Effekt) horizontal über die Form scrollen kann. Wahlweise von rechts nach links (standard), links nach rechts oder hin- und her scrollen ("bounce").
Zusätzlich kann noch rechts und links ein Offset angegeben werden.

using System;
using System.Windows.Forms;
using System.Drawing;

namespace Scavanger
{
    /// <summary>
    /// ScrollLabel: Ein  horizontal scrollendes Label
    /// </summary>
    public class ScrollLabel : Label
    {
        private bool scroll, change;
        private Direction scrollDirection;
        private int scroll_offset_left, scroll_offset_right;

        private Timer scrollTimer = new Timer();

        public ScrollLabel()
        {
            scrollTimer.Interval = 20;
            scrollTimer.Tick += new EventHandler(scrollTimer_Tick);
        }

        public enum Direction : int
        {
            Left = 0,
            Right = 1,
            Bounce = 2
        }

        /// <summary>
        /// Legt fest ob das Label scrollt
        /// </summary>
        public bool Scroll
        {
            set
            {
                if (value)
                {
                    scrollTimer.Start();
                    scroll = true;
                }
                else
                {
                    scrollTimer.Stop();
                    scroll = false;
                }
            }

            get
            {
                return scroll;
            }
        }

        /// <summary>
        /// Offset links
        /// </summary>
        public int Scroll_Offet_Left
        {
            set
            {
                scroll_offset_left = value;
            }

            get
            {
                return scroll_offset_left;
            }
        }

        /// <summary>
        /// Offset rechts
        /// </summary>
        public int Scroll_Offet_Right
        {
            set
            {
                scroll_offset_right = value;
            }

            get
            {
                return scroll_offset_right;
            }
        }

        /// <summary>
        /// Legt die Scrollrichtung fest.
        /// </summary>
        public Direction ScrollDirection
        {
            set
            {
                scrollDirection = value;
            }

            get
            {
                return scrollDirection;
            }
        }


        private void scrollTimer_Tick(object sender, EventArgs e)
        {
            if (scrollDirection == Direction.Left)
            {
                if (this.Location.X == -this.Size.Width + scroll_offset_left)
                    this.Location = new Point(Parent.Size.Width - scroll_offset_right, this.Location.Y);

                this.Location = new Point(this.Location.X - 1, this.Location.Y);
            }
            else if (scrollDirection == Direction.Right)
            {
                if (this.Location.X == this.Size.Width + Parent.Size.Width - scroll_offset_left)
                    this.Location = new Point(-this.Size.Width + scroll_offset_right, this.Location.Y);

                this.Location = new Point(this.Location.X + 1, this.Location.Y);
            }
            else if (scrollDirection == Direction.Bounce)
            {
                if (this.Location.X == scroll_offset_left)
                    change = true;

                if (this.Location.X == Parent.Size.Width - this.Size.Width - scroll_offset_right)
                    change = false;

                if (change)
                    this.Location = new Point(this.Location.X + 1, this.Location.Y);
                else
                    this.Location = new Point(this.Location.X - 1, this.Location.Y);
            }
        }
    }
}

Schlagwörter: scroll, scrollen, label, marquee