效果预览
还是先看看最终的效果图(和QQ登陆中的输入框效果差不多):

效果说明: 1.实现了水印的效果 2.实现了鼠标移上去的时候周围产生辉光 3.输入前端可以设置图片
实现辉光效果
整体说明:
前面显示的那个图片我采用的是一个picturebox,当然如果你愿意也可以自己画(后续的“button再探讨”中就采用的是自己画的方式)。图片后面的输入文本框采用的是textbox控件,这样一来就避免了许多绘制textbox的麻烦(我一开始打算自己绘制用户输入的字符的,不过发现不理想)。然后边框和辉光都是画出来的。
具体实现:
先抛开水印不说。最重要的就是重写的OnPaint方法,如下:- protected override void OnPaint(PaintEventArgs e)
- {
- Graphics g = e.Graphics;
- g.InterpolationMode = InterpolationMode.HighQualityBicubic;
- g.SmoothingMode = SmoothingMode.HighQuality;
- CalculateSizeAndPosition();
- Draw(e.ClipRectangle, e.Graphics);
- base.OnPaint(e);
- }
复制代码 可以看出里面调用了两个方法,做过前面窗体换肤的可能对这个不陌生。就是绘画之前计算好所有的位置大小信息,然后再调用draw画出来。那么这次的calculateSizeAndPosition又做了什么呢?2点!1.判断是否有前端图片需要显示,2.判断是否处于multiline模式。代码如下:- private void CalculateSizeAndPosition()
- {
- if (ForeImage != null)
- {
- //图片大小固定为16
- pic.Height = pic.Width = 16;
- pic.Top = pic.Left = 3;
- txt.Width = Width - pic.Width - 12;
- txt.Location = new Point(16 + 3 + 3, 6);
- }
- else
- {
- pic.Left = -40; //隐藏图片
- txt.Width = Width - 9;
- txt.Location = new Point(3, 6);
- }
- //单行
- if (!txt.Multiline)
- {
- Height = txt.Height + 9;
- }
- else
- {
- txt.Height = Height - 9; //如果是多行则设置实际里面的输入文本框的高度
- }
- }
复制代码 在这个方法里面主要画了三个东西,大家看注释也知道了,分别是:背景,边框,辉光。要注意的就是这里面的微小距离要设置好,我也改了好几次才设置正确。在画边框和辉光的时候,因为实现了圆角边框所以要对圆角度进行判断。
现在绘画的方法也做好了,接下来就是出发重绘的事件了。不然它也不会自动帮你绘画啊^_^。显然当鼠标移上去和移出去的时候需要重新绘画。那我们就在下面几个方法中引发重绘事件:private void Draw(Rectangle rectangle, Graphics g)- private void TextBoxEx2_MouseEnter(object sender, EventArgs e)
- {
- _isFouse = true;
- this.Invalidate();
- }
- private void TextBoxEx2_MouseLeave(object sender, EventArgs e)
- {
- _isFouse = false;
- this.Invalidate();
- }
复制代码 代码很简单,不解释。
基本上面的做好了,大部分就完成了。下面我们完成水印的功能。至此,textbox美化讲解完毕,希望对你有帮助
实现水印效果
水印我是这样子实现的:当用户离开输入焦点的时候检测当前用户有没有输入字符,如果没有输入则改变输入框的颜色(灰色),然后看起来就像是水印的感觉啦。我们专门写了一个函数来设置水印,如下:- private void SetWaterMark()
- {
- if (_waterMark != null && (txt.Text == " " || txt.Text == @" " + WaterMark)) //用户没有输入
- {
- txt.ForeColor = _waterMarkColor;
- txt.Text = @" " + WaterMark;
- }
- else
- {
- txt.ForeColor = ForeColor;
- }
- }
复制代码 然后在什么地方调用呢?刚才上面也已经说了当用户离开焦点的时候判断,不过用户获得输入焦点的时候我们还要设置一下,如果当前的文本时水印的话就清空文本等待输入:- private void Txt_GotFocus(object sender, EventArgs e)
- {
- if (txt.Text == @" " + WaterMark)
- {
- //获得焦点,切换正常文字等待填写
- txt.ForeColor = ForeColor;
- txt.Text = " ";
- }
- }
- private void Txt_LostFocus(object sender, EventArgs e)
- {
- SetWaterMark();
- }
复制代码 这里还有一点需要注意的是,在pageload里面我们也需要调用一下setwatermark方法,不然它一开始是不会显示滴!
源代码快照- namespace QLFUI
- {
- public partial class TextBoxEx : UserControl
- {
- #region - 变量 -
- private Color _borderColor = Color.FromArgb(166, 208, 226);
- private Color _shadowColor = Color.FromArgb(175, 212, 228);
- private Image _foreImage = null;
- private bool _isFouse = false;
- private Color _backColor = Color.Transparent;
- private string _waterMark = null;
- private Color _waterMarkColor = Color.Silver;
- private Color _foreColor = Color.Black;
- private int _radius = 3;
- #endregion
- #region - 属性 -
- [Category("QLFUI"), Description("边框颜色,BorderStyle为FixedSingle有效")]
- public Color BorderColor
- {
- get { return _borderColor; }
- set
- {
- _borderColor = value;
- this.Invalidate();
- }
- }
- [Category("QLFUI"), Description("边框阴影颜色,BorderStyle为FixedSingle有效")]
- public Color ShadowColor
- {
- get { return _shadowColor; }
- set
- {
- _shadowColor = value;
- this.Invalidate();
- }
- }
- [Category("QLFUI"), Description("显示的前端的图片")]
- public Image ForeImage
- {
- get { return pic.Image; }
- set
- {
- _foreImage = value;
- pic.Image = _foreImage;
- Invalidate();
- }
- }
- [Category("QLFUI"), Description("文字")]
- public string Caption
- {
- get
- {
- return txt.Text;
- }
- set
- {
- txt.Text = value;
- SetWaterMark();
- Invalidate();
- }
- }
- [Category("行为"), Description("是否多行显示")]
- public bool Multiline
- {
- get { return txt.Multiline; }
- set
- {
- txt.Multiline = value;
- }
- }
- [Category("行为"), Description("是否以密码形式显示字符")]
- public bool UseSystemPasswordChar
- {
- get { return txt.UseSystemPasswordChar; }
- set
- {
- txt.UseSystemPasswordChar = value;
- }
- }
- [Category("QLFUI"), Description("水印文字")]
- public string WaterMark
- {
- get { return _waterMark; }
- set
- {
- _waterMark = value;
- Invalidate();
- }
- }
- [Category("QLFUI"), Description("水印颜色")]
- public Color WaterMarkColor
- {
- get { return _waterMarkColor; }
- set
- {
- _waterMarkColor = value;
- Invalidate();
- }
- }
- #region 需要被隐藏的属性
- [Browsable(false)]
- public new BorderStyle BorderStyle
- {
- get { return BorderStyle.None; }
- }
- [Browsable(false)]
- public new Color BackColor
- {
- get { return base.BackColor; }
- set { base.BackColor = value; }
- }
- [Browsable(false)]
- public new Image BackgroundImage
- {
- get { return null; }
- }
- [Browsable(false)]
- public new ImageLayout BackgroundImageLayout
- {
- get { return base.BackgroundImageLayout; }
- set { base.BackgroundImageLayout = value; }
- }
- #endregion
- [Category("QLFUI"), Description("边角弯曲的角度(1-10),数值越大越弯曲")]
- public int Radius
- {
- get { return _radius; }
- set
- {
- if (value > 10)
- {
- value = 10;
- }
- if (value < 0)
- {
- value = 0;
- }
- _radius = value;
- this.Invalidate();
- }
- }
- [Browsable(true)]
- [Category("外观"), Description("文本颜色")]
- public new Color ForeColor
- {
- get { return _foreColor; }
- set { _foreColor = value; }
- }
- [Browsable(true)]
- [Category("外观"), Description("鼠标形状")]
- public new Cursor Cursor
- {
- get { return txt.Cursor; }
- set { txt.Cursor = value; }
- }
- [Category("行为"), Description("自动提示方式")]
- public AutoCompleteMode AutoCompleteMode
- {
- get { return txt.AutoCompleteMode; }
- set { txt.AutoCompleteMode = value; }
- }
- [Category("行为"), Description("自动提示类型")]
- public AutoCompleteSource AutoCompleteSource
- {
- get { return txt.AutoCompleteSource; }
- set { txt.AutoCompleteSource = value; }
- }
- #endregion
- #region - 构造函数 -
- public TextBoxEx()
- {
- SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
- InitializeComponent();
- BackColor = Color.Transparent;
- //下面的图片和文本框的大小位置必须设置,否则首次启动时
- //会出现莫名其妙的断痕
- pic.SizeMode = PictureBoxSizeMode.StretchImage;
- pic.BorderStyle = BorderStyle.None;
- pic.Height = pic.Width = 16;//图片大小固定为16
- pic.Left = -40; //隐藏图片
- txt.Width = Width - 9;
- txt.Location = new Point(3, 6);
- txt.MouseEnter += new EventHandler(TextBoxEx2_MouseEnter);
- txt.MouseLeave += new EventHandler(TextBoxEx2_MouseLeave);
- pic.MouseEnter += new EventHandler(TextBoxEx2_MouseEnter);
- pic.MouseLeave += new EventHandler(TextBoxEx2_MouseLeave);
- txt.LostFocus += new EventHandler(Txt_LostFocus);
- txt.GotFocus += new EventHandler(Txt_GotFocus);
- pic.BackColor = Color.White; //不设置成白色则边框会一同加阴影
- }
- #endregion
- #region - 事件 -
- private void TextBoxEx_Load(object sender, EventArgs e)
- {
- SetWaterMark();
- }
- private void TextBoxEx2_MouseEnter(object sender, EventArgs e)
- {
- _isFouse = true;
- this.Invalidate();
- }
- private void TextBoxEx2_MouseLeave(object sender, EventArgs e)
- {
- _isFouse = false;
- this.Invalidate();
- }
- private void Txt_GotFocus(object sender, EventArgs e)
- {
- if (txt.Text == @" " + WaterMark)
- {
- //获得焦点,切换正常文字等待填写
- txt.ForeColor = ForeColor;
- txt.Text = " ";
- }
- }
- private void Txt_LostFocus(object sender, EventArgs e)
- {
- SetWaterMark();
- }
- protected override void OnPaint(PaintEventArgs e)
- {
- Graphics g = e.Graphics;
- g.InterpolationMode = InterpolationMode.HighQualityBicubic;
- g.SmoothingMode = SmoothingMode.HighQuality;
- CalculateSizeAndPosition();
- Draw(e.ClipRectangle, e.Graphics);
-
- base.OnPaint(e);
- }
- #endregion
- #region - 帮助方法 -
- private void SetWaterMark()
- {
- if (_waterMark != null && (txt.Text == " " || txt.Text == @" " + WaterMark)) //用户没有输入
- {
- txt.ForeColor = _waterMarkColor;
- txt.Text = @" " + WaterMark;
- }
- else
- {
- txt.ForeColor = ForeColor;
- }
- }
- private void CalculateSizeAndPosition()
- {
- if (ForeImage != null)
- {
- pic.Top = pic.Left = 3;
- txt.Width = Width - pic.Width - 12;
- txt.Location = new Point(16 + 3 + 3, 6);
- }
- else
- {
- pic.Left = -40; //隐藏图片
- txt.Width = Width - 9;
- txt.Location = new Point(3, 6);
- }
- //单行
- if (!txt.Multiline)
- {
- Height = txt.Height + 9;
- }
- else
- {
- txt.Height = Height - 9;
- }
- }
- private void Draw(Rectangle rectangle, Graphics g)
- {
- #region 画背景
- using (SolidBrush backgroundBrush = new SolidBrush(Color.White))
- {
- g.FillRectangle(backgroundBrush, 2, 2, this.Width - 5, this.Height -4);
- }
- #endregion
- #region 画阴影(外边框)
- Color drawShadowColor = _shadowColor;
- if (!_isFouse) //判断是否获得焦点
- {
- drawShadowColor = Color.Transparent;
- }
- using (Pen shadowPen = new Pen(drawShadowColor))
- {
- if (_radius == 0)
- {
- g.DrawRectangle(shadowPen, new Rectangle(rectangle.X, rectangle.Y, rectangle.Width - 1, rectangle.Height - 1));
- }
- else
- {
- g.DrawPath(shadowPen, DrawHelper.DrawRoundRect(rectangle.X, rectangle.Y, rectangle.Width - 2, rectangle.Height - 1, _radius));
- }
- }
- #endregion
- #region 画边框
- using (Pen borderPen = new Pen(_borderColor))
- {
- if (_radius == 0)
- {
- g.DrawRectangle(borderPen, new Rectangle(rectangle.X + 1, rectangle.Y + 1, rectangle.Width - 3, rectangle.Height - 3));
- }
- else
- {
- g.DrawPath(borderPen, DrawHelper.DrawRoundRect(rectangle.X + 1, rectangle.Y + 1, rectangle.Width - 3, rectangle.Height - 2, _radius));
- }
- }
- #endregion
- }
- #endregion
- }
- }
复制代码 代码下载:
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