winfrom 重绘checkbox 使前面的选着框变大

2013-07-16 03:25:03 678 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C# winform treeView checkbox全选反选 private void treeView2_AfterCheck(object sender, TreeViewEventArgs e) { if (e.Action != TreeViewAction.Unknown) { CheckAllChildNodes(e.Node, e.Node.Checked) 阅读详情

请问这个怎么做啊。

我在网上下了一份示例性的代码



public class SkinCheckBox:CheckBox

	{

		private State state=State.Normal;



		public SkinCheckBox()

		{

			this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);

			this.BackColor = System.Drawing.Color.Transparent;

		}



		protected override void OnMouseEnter(EventArgs e)

		{

			state = State.MouseOver;

			this.Invalidate();

			base.OnMouseEnter(e);

		}



		protected override void OnMouseLeave(EventArgs e)

		{

			state = State.Normal;

			this.Invalidate();

			base.OnMouseLeave(e);

		}



		protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)

		{

			if ((e.Button & MouseButtons.Left) != MouseButtons.Left) return;



			state = State.MouseDown;

			this.Invalidate();

			base.OnMouseDown(e);

		}



		protected override void OnMouseUp(System.Windows.Forms.MouseEventArgs e)

		{

			if ((e.Button & MouseButtons.Left) == MouseButtons.Left)

				state = State.Normal;

			this.Invalidate();

			base.OnMouseUp(e);

		}

		

		protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)

		{	

			if (SkinImage.checkbox.img==null) 

			{

				base.OnPaint(e);

				return;

			}



			int i = (int)state;

			if (!this.Enabled) i = 16;

			if (this.CheckState == CheckState.Checked) i+=16;

			if (this.CheckState == CheckState.Indeterminate) i+=16;



			Rectangle rc = this.ClientRectangle;

			Rectangle r1 = rc;;

			Graphics g = e.Graphics;

			base.OnPaint(e);

			

			int cw = SystemInformation.MenuCheckSize.Width ;



			if (this.CheckAlign == ContentAlignment.MiddleLeft)

			{

				r1=Rectangle.FromLTRB(0,(r1.Height-cw)/2,0+cw,(r1.Height+cw)/2);

			} 

			else

			{

				r1=Rectangle.FromLTRB(r1.Right-cw-1,(r1.Height-cw)/2,r1.Right,(r1.Height+cw)/2);

			}

			SkinDraw.DrawRect1(g,SkinImage.checkbox,r1,i);

		}

	}