自定义一个带圆角的Textbox,没有用win32 Api，相对比用Api要好一点。注意窗口AutoScaleMode设置为None.
[DefaultEvent("TextChanged")]
public partial class BzTextBox : UserControl
{
private Color borderColor = Color.MediumSlateBlue;
private int borderSize = 2;
private bool underlinedStyle = false;
private Color borderFocuseColor = Color.HotPink;
private bool isFocused = false;
private int borderRadius = 0;
private Color placeholderColor = Color.DarkGray;
private string placeholderText = "";
private bool isPlaceholder = false;
private bool isPasswordChar = false;
private string dbFiled = "";
public BzTextBox()
{
InitializeComponent();
}
public new event EventHandler TextChanged;
[Category("BZ Advance")]
public Color BorderColor
{
get
{
return borderColor;
}
set
{
borderColor = value;
this.Invalidate();
}
}
[Category("BZ Advance")]
public int BorderSize
{
get
{
return borderSize;
}
set
{
borderSize = value;
this.Invalidate();
}
}
[Category("BZ Advance")]
public bool UnderlinedStyle
{
get
{
return underlinedStyle;
}
set
{
underlinedStyle = value;
this.Invalidate();
}
}
[Category("BZ Advance")]
public bool PasswordChar
{
get
{
return isPasswordChar;
}
set
{
isPasswordChar = value;
txt.UseSystemPasswordChar = value;
}
}
[Category("BZ Advance")]
public bool Multiline
{
get
{
return txt.Multiline;
}
set {
txt.Multiline = value;
}
}
[Category("BZ Advance")]
public override Color BackColor
{
get
{
return base.BackColor;
}
set
{
base.BackColor = value;
txt.BackColor = value;
}
}
[Category("BZ Advance")]
public override Color ForeColor
{
get
{
return base.ForeColor;
}
set
{
base.ForeColor = value;
txt.ForeColor = value;
}
}
[Category("BZ Advance")]
public override Font Font
{
get
{
return base.Font;
}
set
{
base.Font = value;
txt.Font = value;
if (this.DesignMode)
{
UpdateControlHeight();
}
}
}
[Category("BZ Advance")]
public string Texts
{
get
{
if (isPlaceholder)
{
return "";
}
else
{
return txt.Text;
}
}
set
{
txt.Text = value;
SetPlaceHolder();
}
}
[Category("BZ Advance")]
public ScrollBars ScrollBars
{
get
{
return txt.ScrollBars;
}
set
{
if (Multiline)
{
txt.ScrollBars = value;
UpdateControlHeight();
}
}
}
[Category("BZ Advance")]
public Color BorderFocuseColor
{
get
{
return borderFocuseColor;
}
set
{
borderFocuseColor = value;
}
}
[Category("BZ Advance")]
public int BorderRadius
{
get
{
return borderRadius;
}
set
{
if (value >= 0)
{
borderRadius = value;
this.Invalidate();
}
}
}
[Category("BZ Advance")]
public Color PlaceHolderColor
{
get
{
return placeholderColor;
}
set
{
placeholderColor = value;
if (isPasswordChar)
{
txt.ForeColor = value;
}
}
}
[Category("BZ Advance")]
public string PlaceholderText
{
get
{
return placeholderText;
}
set
{
placeholderText = value;
txt.Text = "";
SetPlaceHolder();
}
}
[Category("BZ Advance")]
public string DbFiled
{
get
{
return dbFiled;
}
set
{
dbFiled = value;
}
}
private void SetPlaceHolder()
{
if (string.IsNullOrWhiteSpace(txt.Text) && placeholderText != "")
{
isPlaceholder = true;
txt.Text = placeholderText;
txt.ForeColor = placeholderColor;
if (isPasswordChar)
{
txt.UseSystemPasswordChar = false;
}
}
}
private void RemovePlaceholder()
{
if (isPlaceholder && placeholderText != "")
{
isPlaceholder = false;
txt.Text = "";
txt.ForeColor = this.ForeColor;
if (isPasswordChar)
{
txt.UseSystemPasswordChar = true;
}
}
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics graphics = e.Graphics;
if (borderRadius > 1)
{
var rectBorderSmooth = this.ClientRectangle;
var rectBorder = Rectangle.Inflate(rectBorderSmooth, -BorderSize, -BorderSize);
int smoothSize = BorderSize > 0 ? BorderSize : 1;
using (GraphicsPath pathBorderSmooth = GetFigurePath(rectBorderSmooth, borderRadius))
using (GraphicsPath pathBorder = GetFigurePath(rectBorder, borderRadius - BorderSize))
using (Pen penBorderSmooth = new Pen(this.Parent.BackColor, smoothSize))
using (Pen penBorder = new Pen(BorderColor, BorderSize))
{
this.Region = new Region(pathBorderSmooth);
if (BorderRadius > 15)
{
SetTextBoxRoundedRegion();
}
graphics.SmoothingMode = SmoothingMode.AntiAlias;
penBorder.Alignment = PenAlignment.Center;
if (isFocused)
{
penBorder.Color = BorderFocuseColor;
}
if (underlinedStyle)
{
graphics.DrawPath(penBorderSmooth, pathBorderSmooth);
graphics.SmoothingMode = SmoothingMode.None;
graphics.DrawLine(penBorder, 0, this.Height - 1, this.Width, this.Height - 1);
}
else
{
graphics.DrawPath(penBorderSmooth, pathBorderSmooth);
graphics.DrawPath(penBorder, pathBorder);
}
}
}
else
{
using (Pen penBorder = new Pen(borderColor, BorderSize))
{
this.Region = new Region(this.ClientRectangle);
penBorder.Alignment = PenAlignment.Inset;
if (!isFocused)
{
if (underlinedStyle)
{
graphics.DrawLine(penBorder, 0, this.Height - 1, this.Width, this.Height - 1);
}
else
{
graphics.DrawRectangle(penBorder, 0, 0, this.Width - 0.5F, this.Height - 0.5F);
}
}
else
{
penBorder.Color = borderFocuseColor;
if (underlinedStyle)
{
graphics.DrawLine(penBorder, 0, this.Height - 1, this.Width, this.Height - 1);
}
else
{
graphics.DrawRectangle(penBorder, 0, 0, this.Width - 0.5F, this.Height - 0.5F);
}
}
}
}
}
private void SetTextBoxRoundedRegion()
{
GraphicsPath pathText;
if (Multiline)
{
pathText = GetFigurePath(txt.ClientRectangle, borderRadius - borderSize);
txt.Region = new Region(pathText);
}
else
{
pathText = GetFigurePath(txt.ClientRectangle, borderSize * 2);
txt.Region = new Region(pathText);
}
}
private GraphicsPath GetFigurePath(RectangleF rect, float radius)
{
GraphicsPath path = new GraphicsPath();
float curveSize = radius * 2F;
path.StartFigure();
path.AddArc(rect.X, rect.Y, curveSize, curveSize, 180, 90);
path.AddArc(rect.Right - curveSize, rect.Y, curveSize, curveSize, 270, 90);
path.AddArc(rect.Right - curveSize, rect.Bottom - curveSize, curveSize, curveSize, 0, 90);
path.AddArc(rect.X, rect.Bottom - curveSize, curveSize, curveSize, 90, 90);
path.CloseAllFigures();
return path;
}
protected override void OnResize(EventArgs e)
{
base.OnResize(e);
UpdateControlHeight();
}
private void UpdateControlHeight()
{
if (txt.Multiline == false)
{
int txtHeight = TextRenderer.MeasureText("Text", this.Font).Height + 1;
txt.Multiline = true;
txt.MinimumSize = new Size(0, txtHeight);
txt.Multiline = false;
this.Height = txt.Height + this.Padding.Top + this.Padding.Bottom;
}
}
private void txt_TextChanged(object sender, EventArgs e)
{
if (TextChanged!=null)
{
TextChanged.Invoke(sender, e);
}
}
private void txt_KeyPress(object sender, KeyPressEventArgs e)
{
this.OnKeyPress(e);
}
private void txt_Click(object sender, EventArgs e)
{
this.OnClick(e);
}
private void txt_MouseEnter(object sender, EventArgs e)
{
this.OnMouseEnter(e);
}
private void txt_MouseLeave(object sender, EventArgs e)
{
this.OnMouseLeave(e);
}
private void txt_Enter(object sender, EventArgs e)
{
isFocused = true;
this.Invalidate();
RemovePlaceholder();
}
private void txt_Leave(object sender, EventArgs e)
{
isFocused = false;
this.Invalidate();
SetPlaceHolder();
}
}
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