这篇文章给大家分享的是有关C#如何实现自定义圆角按钮的内容。小编觉得挺实用的,因此分享给大家做个参考,一起跟随小编过来看看吧。
Winform中自带的button没有圆角属性,所以我们继承Button类,重写OnPaint事件来绘制圆角按钮。
1.绘制圆角按钮框需要用到系统自带的绘制方法:首先引入Gdi32.dll中的CreateRoundRectRgn方法。经过验证此方法在大量控件情况下使用,会导致GDI+绘图问题!现在改用自己绘制的圆角GraphicsPath进行填充显示,效果更好,圆角更圆润了!
重写OnPaint方法:
protected override void OnPaint(PaintEventArgs pe) { if (!roundCorner) { base.OnPaint(pe); return; } Graphics g = pe.Graphics; g.SmoothingMode = SmoothingMode.AntiAlias; //g.SmoothingMode = SmoothingMode.HighQuality; //g.CompositingQuality = CompositingQuality.HighQuality; //g.InterpolationMode = InterpolationMode.HighQualityBicubic; Rectangle rect = this.ClientRectangle; Brush brhBorder = new SolidBrush(crBorderPainting); Brush brhRect = new SolidBrush(BackColor); Brush b0 = new SolidBrush(this.Parent.BackColor); Brush bfont = new SolidBrush(ForeColor); try { g.Clear(this.Parent.BackColor); int borderSize = FlatAppearance.BorderSize; try { GraphicsPath path = CreateRoundRect(rect.Left, rect.Top, rect.Left + rect.Width - borderSize, rect.Top + rect.Height - borderSize); g.FillPath(brhBorder, path); path.Dispose(); path = CreateRoundRect(rect.Left + borderSize /2f, rect.Top + borderSize / 2f, rect.Left + rect.Width - borderSize * 2, rect.Top + rect.Height - borderSize * 2); g.FillPath(brhRect, path); path.Dispose(); } catch (Exception e) { Console.WriteLine("FillPath:" + e.Message); } if (this.Text != string.Empty) { StringFormat sf = StringFormat.GenericTypographic; sf.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces; SizeF sizeoftext = g.MeasureString(this.Text, Font); float tx = (float)((this.Width - sizeoftext.Width) / 2.0); float ty = (float)((this.Height - sizeoftext.Height) / 2.0); g.DrawString(this.Text, Font, bfont, tx, ty); } } finally { b0.Dispose(); brhBorder.Dispose(); brhRect.Dispose(); bfont.Dispose(); } }
private GraphicsPath CreateRoundRect(float rleft, float rtop, float rwidth, float rheight) { float r = radius; if (rwidth < rheight) { if (radius > rwidth / 2f) r = rwidth / 2f; } else { if (radius > rheight / 2f) r = rheight / 2f; } GraphicsPath path; RectangleF rectRow = new RectangleF(rleft, rtop + r, rwidth, rheight - r * 2); RectangleF rectColumn = new RectangleF(rleft + r, rtop, rwidth - r * 2, rheight); path = new GraphicsPath(FillMode.Winding); path.AddRectangle(rectRow); path.AddRectangle(rectColumn); //左上 path.AddEllipse(rleft, rtop, r * 2, r * 2); //右上 path.AddEllipse(rleft + rwidth - r * 2, rtop, r * 2, r * 2); //左下 path.AddEllipse(rleft, rtop + rheight - r * 2, r * 2, r * 2); //右下 path.AddEllipse(rleft + rwidth - r * 2, rtop + rheight - r * 2, r * 2, r * 2); return path; }
2.如果需要增加悬浮效果,可以重写OnMouseEnter、OnMouseLeave事件来改变边界及背景色。
private Color crBorderActive = Color.FromArgb(Convert.ToInt32("FF3283C4", 16)); private Color crRectActive = Color.FromArgb(Convert.ToInt32("FFE3F3FB", 16)); private Color crBorderDefault = Color.FromArgb(215, 215, 215); protected override void OnMouseEnter(EventArgs e) { base.OnMouseEnter(e); this.BackColor = crRectActive; this.FlatAppearance.BorderColor = crBorderActive; } protected override void OnMouseLeave(EventArgs e) { base.OnMouseLeave(e); this.BackColor = Color.White; this.FlatAppearance.BorderColor = crBorderDefault; }
至此一个圆角按钮就完成了^_^。效果如下:
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