从Control类直接继承自定义控件(适合CF,因为CF没有UserControl基类)!

1.支持Click事件的Label控件

 

using System;
using System.Windows.Forms;
using System.Drawing;
namespace WindowsApplication1 {
    public enum VAlign {
        Top,Middle,Bottom
    }
    public enum HAlign {
        Left,Middle,Right
    }
    public class ClickableLabel:System.Windows.Forms.Control {

        private VAlign vrtAlign=VAlign.Middle;
        private HAlign hrtAlign=HAlign.Middle;
        private BorderStyle bdrStyle=BorderStyle.None;

        public ClickableLabel() {
            
        }

        public VAlign VAlign {
            get {
                return this.vrtAlign;
            }
            set {
                this.vrtAlign=value;
                this.Invalidate();
            }
        }

        public HAlign HAlign {
            get {
                return this.hrtAlign;
            }
            set {
                this.hrtAlign=value;
                this.Invalidate();
            }
        }

        public BorderStyle BorderStyle {
            get {
                return this.bdrStyle;
            }
            set {
                this.bdrStyle=value;
                this.Invalidate();
            }
        }

        public override string Text {
            get {
                return base.Text;
            }
            set {
                base.Text = value;
                this.Invalidate();
            }
        }

        protected override void OnPaint(PaintEventArgs e) {
            int borderSpace=0;
            Graphics gr=e.Graphics;

            using (Pen penDraw=new Pen(Color.Black)) {
                switch(this.BorderStyle) {
                    case BorderStyle.FixedSingle:
                        gr.DrawRectangle(penDraw,0,0,this.Width-1,this.Height-1);
                        borderSpace=2;
                        break;
                    case BorderStyle.Fixed3D:
                        gr.DrawRectangle(penDraw,this.ClientRectangle);
                        borderSpace=2;
                        break;
                    case BorderStyle.None:
                        borderSpace=0;
                        break;
                }

                SizeF sizeText=gr.MeasureString(this.Text,this.Font);
                float posX=0.0F;
                float posY=0.0F;
                switch(this.HAlign) {
                    case HAlign.Left:
                        posX=borderSpace;
                        break;
                    case HAlign.Middle:
                        posX=(this.Width-sizeText.Width)/2;
                        break;
                    case HAlign.Right:
                        posX=(this.Width-sizeText.Width)-borderSpace;
                        break;
                }

                switch(this.VAlign) {
                    case VAlign.Top:
                        posY=borderSpace;
                        break;
                    case VAlign.Middle:
                        posY=(this.Height-sizeText.Height)/2;
                        break;
                    case VAlign.Bottom:
                        posY=(this.Height-sizeText.Height)-borderSpace;
                        break;
                }

                SolidBrush b=new SolidBrush(this.ForeColor);
                gr.DrawString(this.Text,this.Font,b,posX,posY);
                b.Dispose();
            }
            base.OnPaint (e);
        }

    }

}


 

2.窗体测试代码:

 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication1 {
    public class Form1 : System.Windows.Forms.Form {
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.RadioButton radioButton1;
        private System.Windows.Forms.RadioButton radioButton2;
        private System.Windows.Forms.RadioButton radioButton3;
        private System.Windows.Forms.GroupBox groupBox2;
        private System.Windows.Forms.RadioButton radioButton4;
        private System.Windows.Forms.RadioButton radioButton5;
        private System.Windows.Forms.RadioButton radioButton6;
        private System.Windows.Forms.GroupBox groupBox3;
        private System.Windows.Forms.RadioButton radioButton7;
        private System.Windows.Forms.RadioButton radioButton8;
        private System.Windows.Forms.RadioButton radioButton9;

        private System.ComponentModel.Container components = null;
        private ClickableLabel label=null;
        public Form1() {

            InitializeComponent();

            label=new ClickableLabel();
            label.ForeColor=Color.Black;
            label.Location=new System.Drawing.Point(152, 10);
            label.Size=new Size(92,30);
            label.Text="测试Label";
            label.Click+=new EventHandler(label_Click);
            this.Controls.Add(label);

        }

        protected override void Dispose( bool disposing ) {
            if( disposing ) {
                if (components != null) {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows 窗体设计器生成的代码

        [STAThread]
        static void Main() {
            Application.Run(new Form1());
        }

        private void radioButton1_CheckedChanged(object sender, System.EventArgs e) {
            RadioButton r=null;
            if (sender==this.radioButton1) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.BorderStyle=BorderStyle.FixedSingle;
                }
            }
            if (sender==this.radioButton2) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.BorderStyle=BorderStyle.Fixed3D;
                }
            }
            if (sender==this.radioButton3) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.BorderStyle=BorderStyle.None;
                }
            }

            if (sender==this.radioButton4) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.HAlign=HAlign.Right;
                }
            }
            if (sender==this.radioButton5) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.HAlign=HAlign.Middle;
                }
            }
            if (sender==this.radioButton6) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.HAlign=HAlign.Left;
                }
            }

            if (sender==this.radioButton7) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.VAlign=VAlign.Bottom;
                }
            }
            if (sender==this.radioButton8) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.VAlign=VAlign.Middle;
                }
            }
            if (sender==this.radioButton9) {
                r=(RadioButton)sender;
                if (r.Checked==true) {
                    this.label.VAlign=VAlign.Top;
                }
            }
        }

        private void label_Click(object sender, EventArgs e) {
            MessageBox.Show("This is a label than can be able to click!");
        }
    }
}

 

posted @ 2006-09-30 10:37  吴东雷  阅读(958)  评论(0)    收藏  举报