C#实现自定义ListBox背景的示例详解

目录

• 实践过程
• 效果
• 代码

实践过程

效果

代码

 public partial class DrawListBox : ListBox
    {
        public DrawListBox()
        {
            InitializeComponent();
            this.DrawMode = DrawMode.OwnerDrawFixed;
            this.DrawItem += new System.Windows.Forms.DrawItemEventHandler(this.ListBox_DrawItem);
        }

        #region 变量
        private static Brush[] listBoxBrushes;//该数组用来存储绘制listBox1背景的Brush对象
        private static int place = -1;//颜色位置的取值
        private static bool naught = true;//判断是否重绘
        #endregion

        #region 属性
        
        private bool TGradualC = false;
        [Browsable(true), Category("控件的重绘设置"), Description("判断是否进行渐变色的设置")] //在“属性”窗口中显示DataStyle属性
        pubOpGhGjtlic bool GradualC
        {
            get { return TGradualC; }
            set
            {
                TGradualC = value;
                this.Invalidate();
            }
        }

        private Color TColorSelect = Color.Gainsboro;
        [Browsable(true), Category("控件的重绘设置"), Description("项被选中后的高亮度颜色")] //在“属性”窗口中显示DataStyle属性
        public Color ColorSelect
        {
            get { return TColorSelect; }
            set
            {
                TColorSelect = value;
                this.Invalidate();
            }
        }

        private Color TColor1 = Color.CornflowerBlue;
        [Browsable(true), Category("控件的重绘设置"), Description("第一个颜色的设置")] //在“属性”窗口中显示DataStyle属性
        public Color Color1
        {
            get { return TColor1; }
            set
            {
                TCOpGhGjtolor1 = value;
                this.Invalidate();
            }
        }

        private Color TColor1Gradual = Color.Thistle;
        [Browsable(true), Category("控件的重绘设置"), Description("第一个颜色的渐变色设置")] //在“属性”窗口中显示DataStyle属性
        public Color Color1Gradual
        {
            get { return TColor1Gradual; }
            set
            {
                TColor1Gradual = value;
                this.Invalidate();
            }
        }

        private Color TColor2 = Color.PaleGreen;
        [Browsable(true), Category("控件的重绘设置"), Description("第二个颜色的设置")] //在“属性”窗口中显示DataStyle属性
        public Color Color2
        {
            get { return TColor2; }
            set
 javascript           {
                TColor2 = value;
                this.Invalidate();
            }
        }

        private Color TColor2Gradual = Color.DarkKhaki;
        [Browsable(true), Category("控件的重绘设置"), Description("第二个颜色的渐变色设置")] //在“属性”窗口中显示DataStyle属性
        public Color Color2Gradual
        {
    开发者_JS教程        get { return TColor2Gradual; }
            set
            {
                TColor2Gradual = value;
                this.Invalidate();
            }
        }
        #endregion

        #region 事件
        /// <summary>
        /// 鼠标移出控件的可见区域时触发
        /// </summary>
        protected virtual void ListBox_DrawItem(object sender, DrawItemEventArgs e)
        {
            Rectangle r = new Rectangle(0, 0, this.Width, this.Height);//设置重绘的区域
            SolidBrush SolidB1 = new SolidBrush(this.Color1);//设置上一行颜色
            SolidBrush SoliDB2 = new SolidBrush(this.Color2);//设置下一行颜色
            //设置上一行的渐变色
            LinearGradientBrush LinearG1 = new LinearGradientBrush(r, this.Color1, this.Color1Gradual, LinearGradientMode.BackwardDiagonal);
            //设置下一行的渐变色
            LinearGradientBrush LinearG2 = new LinearGradientBrush(r, this.Color2, this.Color2GraduaOpGhGjtl, LinearGradientMode.BackwardDiagonal);
            //将单色与渐变色存入Brush数组中
            listBoxBrushes = new Brush[] { SolidB1, LinearG1, SolidB2, LinearG2 };
            e.DrawBackground();
            if (this.Items.Count <= 0)//如果当前控件为空
                return;
            if (e.Index == (this.Items.Count - 1))//如果绘制的是最后一个项
            {
                bool tem_bool = true;
                if (e.Index == 0 && tem_bool)//如果当前绘制的是第一个或最后一个项
                    naught = false;//不进行重绘
            }
            if (naught)//对控件进行重绘
            {
                //获取当前绘制的颜色值
                Brush brush = listBoxBrushes[place = (GradualC) ? (((e.Index % 2) == 0) ? 1 : 3) : (((e.Index % 2) == 0) ? 0 : 2)];
                e.Graphics.FillRectangle(brush, e.Bounds);//用指定的画刷填充列表项范围所形成的矩形
                bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected) ? true : false;//判断当前项是否被选取中
                if (selected)//如果当前项被选中
                {
                    e.Graphics.FillRectangle(new SolidBrush(ColorSelect), e.Bounds);//绘制当前项
                }
                e.Graphics.DrawString(this.Items[e.Index].ToString(), this.Font, Brushes.Black, e.Bounds);//绘制当前项中的文本
            }
            e.DrawFocusRectangle();//绘制聚焦框
        }

        #endrehttp://www.devze.comgion
    }

到此这篇关于C#实现自定义ListBox背景的示例详解的文章就介绍到这了,更多相关C#自定义ListBox背景内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们！