Winform窗体程序 实现TextBox背景透明，水印提示，背影半透明效果 |
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Winform窗体程序 实现TextBox背景透明，水印提示，背影半透明效果
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效果图： 1.透明TextBox效果和水印效果
2.背影半透明效果
新建一个FormLogins窗体
项目添加BaseTextBox 类库 在此类库下建立一个TextBox1类，实现背景透明效果和水印效果
出自：https://blog.csdn.net/x894802545/article/details/48736087 再添加一个类库 BaseContro 里面新建一个 TransparentRect 类，实现背影效果
using System; using System.Collections.Generic; using System.Drawing; using System.Drawing.Drawing2D; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace BaseContro { public class TransparentRect : UserControl { public enum ShapeBorderStyles { ShapeBSNone, ShapeBSFixedSingle, }; private ShapeBorderStyles _borderStyle = ShapeBorderStyles.ShapeBSNone; private Color _backColor = Color.Black; private Color _borderColor = Color.White; private int _radius = 20; private int _opacity = 125; protected int pointX = 0; protected int pointY = 0; protected Rectangle iRect = new Rectangle(); public TransparentRect() { base.BackColor = Color.Transparent; SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer | ControlStyles.ResizeRedraw | ControlStyles.SupportsTransparentBackColor | ControlStyles.UserPaint, true); SetStyle(ControlStyles.Opaque, false); UpdateStyles(); } public new Color BackColor { get { return _backColor; } set { _backColor = value; Invalidate(); } } public ShapeBorderStyles ShapeBorderStyle { get { return _borderStyle; } set { _borderStyle = value; this.Invalidate(); } } public Color BorderColor { get { return _borderColor; } set { _borderColor = value; Invalidate(); } } public int Opacity { get { return _opacity; } set { _opacity = value; this.Invalidate(); } } public int Radius { get { return _radius; } set { _radius = value; this.Invalidate(); } } public override Color ForeColor { get { return base.ForeColor; } set { base.ForeColor = value; this.Invalidate(); } } protected override void OnPaint(PaintEventArgs e) { SmoothingMode sm = e.Graphics.SmoothingMode; e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; if (_borderStyle == ShapeBorderStyles.ShapeBSFixedSingle) DrawBorder(e.Graphics); DrawLabelBackground(e.Graphics); e.Graphics.SmoothingMode = sm; } private void DrawBorder(Graphics g) { Rectangle rect = this.ClientRectangle; rect.Width--; rect.Height--; using (GraphicsPath bp = GetPath(rect, _radius)) { using (Pen p = new Pen(_borderColor)) { g.DrawPath(p, bp); } } } private void DrawLabelBackground(Graphics g) { Rectangle rect = this.ClientRectangle; iRect = rect; rect.X++; rect.Y++; rect.Width -= 2; rect.Height -= 2; using (GraphicsPath bb = GetPath(rect, _radius)) { using (Brush br = new SolidBrush(Color.FromArgb(_opacity, _backColor))) { g.FillPath(br, bb); } } } protected GraphicsPath GetPath(Rectangle rc, int r) { int x = rc.X, y = rc.Y, w = rc.Width, h = rc.Height; r = r 0) { if (r > h) { r = h; }; if (r > w) { r = w; }; path.AddArc(x, y, r, r, 180, 90); path.AddArc(x + w - r, y, r, r, 270, 90); path.AddArc(x + w - r, y + h - r, r, r, 0, 90); path.AddArc(x, y + h - r, r, r, 90, 90); path.CloseFigure(); } else { path.AddRectangle(rc); } return path; } } } 项目结构：
最后，重新编译解决方案。打开FormLogins窗体界面，再打开工具栏。 工具栏会出现重写后的两个组件，TextBox1,TransparentRect
然后就可以像平常使用winform组件一样，拉进窗体使劲造了。 出自:https://bbs.csdn.net/topics/392587176 代码：https://download.csdn.net/download/weixin_39237340/15107248 参考文献：https://bbs.csdn.net/topics/392587176 参考文献：https://www.cnblogs.com/ZCoding/p/4269637.html 参考文献：https://blog.csdn.net/x894802545/article/details/48736087
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