透明按钮 控件...
using System;using System.ComponentModel;using System.Drawing;using System.Drawing.Drawing2D;using System.Windows.Forms;namespace GlassButton{#region//控件状态///<summary>/// 控件状态///</summary> public enum State {///<summary>/// 无///</summary> Normal = 0,///<summary>/// 获得焦点///</summary> Focused = 1,///<summary>/// 失去焦点///</summary> LostFocused = 2,///<summary>/// 鼠标指针进入控件///</summary> MouseEnter = 3 }#endregionpublic class GlassButton : Control {#region//私有变量private int bmp_Left;private const int bmp_Top = 5;private const int bmp_Size = 45;private bool _focused = false;private State state = State.Normal;private Bitmap _bmp = null;#endregion#region//构造函数public GlassButton() { SetStyle(ControlStyles.DoubleBuffer, true); //双缓冲防止重绘时闪烁 SetStyle(ControlStyles.AllPaintingInWmPaint, true); //忽略 WM_ERASEBKGND 窗口消息减少闪烁 SetStyle(ControlStyles.UserPaint, true); //自定义绘制控件内容 SetStyle(ControlStyles.SupportsTransparentBackColor, true); //模拟透明 SetStyle(ControlStyles.Selectable, true); //接收焦点 Size = new Size(73, 81); //初始大小 Font = new Font("微软雅黑", 9); //控件字体 }#endregion#region//属性///<summary>/// 获取或设置控件显示的图片///</summary> [Description("获取或设置控件显示的图标")]public Bitmap Bitmap {get { return _bmp; }set { _bmp = value; Invalidate(false); } }///<summary>/// 重写控件焦点属性///</summary> [Description("重写控件焦点属性")]public new bool Focused {get { return _focused; }set { _focused = value;if (_focused) state = State.Focused;else state = State.LostFocused; Invalidate(false); } }#endregion#region//重载事件//自定义绘制 protected override void OnPaint(PaintEventArgs e) {base.OnPaint(e); Graphics g = e.Graphics; g.SmoothingMode = SmoothingMode.HighQuality; g.PixelOffsetMode = PixelOffsetMode.HighQuality;switch (state) {case State.Focused: { DrawSelected(g);break; }case State.MouseEnter: {if (!Focused) g.DrawImage(Properties.Resources.enter, ClientRectangle);else DrawSelected(g);break; } } DrawImage(g); DrawText(g); } //焦点进入 protected override void OnEnter(EventArgs e) {base.OnEnter(e); Focused = true; }//失去焦点 protected override void OnLeave(EventArgs e) {base.OnLeave(e); Focused = false; }//禁止调整大小 protected override void OnResize(EventArgs e) { Width = 73; Height = 81; }protected override void OnMouseEnter(EventArgs e) {base.OnMouseEnter(e); state = State.MouseEnter; Invalidate(false); }protected override void OnMouseLeave(EventArgs e) {base.OnMouseLeave(e);if (!Focused) { state = State.LostFocused; Invalidate(false); } }//只响应单击鼠标左键事件 protected override void OnClick(EventArgs e) { MouseEventArgs m = (MouseEventArgs)e;if (m.Button == MouseButtons.Left) {base.OnClick(e); Focus(); } }#endregion#region//方法#region//Drawvoid DrawSelected(Graphics g) { g.DrawImage(Properties.Resources.down, ClientRectangle); }void DrawImage(Graphics g) {if (_bmp != null) { Bitmap bmp = ScaleZoom(_bmp); bmp_Left = (Width - bmp.Width) / 2; g.DrawImage(bmp, new Rectangle(bmp_Left, bmp_Top, bmp.Width, bmp.Height)); } }void DrawText(Graphics g) { SizeF size = g.MeasureString(Text, Font); g.DrawString(Text, Font, new SolidBrush(ForeColor), (Width - size.Width) / 2, 58); }#endregion#region//按比例缩放图片public Bitmap ScaleZoom(Bitmap bmp) {if (bmp != null) {double zoomScale;if (bmp.Width > bmp_Size || bmp.Height > bmp_Size) {double imageScale = (double)bmp.Width / (double)bmp.Height;double thisScale = 1;if (imageScale > thisScale) { zoomScale = (double)bmp_Size / (double)bmp.Width;return BitMapZoom(bmp, bmp_Size, (int)(bmp.Height * zoomScale)); }else { zoomScale = (double)bmp_Size / (double)bmp.Height;return BitMapZoom(bmp, (int)(bmp.Width * zoomScale), bmp_Size); } } }return bmp; }#endregion#region//缩放BitMap///<summary>/// 图片缩放///</summary>///<param name="bmpSource">源图片</param>///<param name="bmpSize">缩放图片的大小</param>///<returns>缩放的图片</returns> public Bitmap BitMapZoom(Bitmap bmpSource, int bmpWidth, int bmpHeight) { Bitmap bmp, zoomBmp;try { bmp = new Bitmap(bmpSource); zoomBmp = new Bitmap(bmpWidth, bmpHeight); Graphics gh = Graphics.FromImage(zoomBmp); gh.InterpolationMode = InterpolationMode.HighQualityBicubic; gh.DrawImage(bmp, new Rectangle(0, 0, bmpWidth, bmpHeight), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel); gh.Dispose();return zoomBmp; }catch { }finally { bmp = null; zoomBmp = null; GC.Collect(); }return null; }#endregion#endregion }}
转载于:https://www.cnblogs.com/hengbo/archive/2011/11/02/2232552.html
相关资源：C#透明按钮控件GlassButton