C#用户控件之转换开关
如何自定义一个转换键(Toggle)?
三步绘制一个精美控件:
- 定义属性;
- 画布重绘;
- 添加事件;
主要技能:
- 如何自定义属性;
- 画布重绘的一般格式;
- 控件的事件触发过程;
- 技能扩展
-
转换按钮使能时添加二次确认弹框?
-
在From窗体中应用控件时,点击事件没有触发?
-
属性名称在控件属性树中的排列如何定义?
-
添加一个字体更改属性?
-
1.定义属性
- 字体(Font)
- 颜色(Color)
- 字符串(String)
- 枚举(Enum)
- 属性说明 [Browsable(true)]
#region 属性
private Font displayFont = new Font("Segoe UI", 12);
[Browsable(true)]
[Category("布局_G")]
[Description("字体格式")]
public Font DisplayFont
{
get { return displayFont; }
set
{
if (value != null)
{
displayFont = value;
this.Invalidate(); // Trigger redraw
}
}
}
private bool _checked = false;
[Browsable(true)] //说明(需放在属性前边):是否选中
[Category("布局_G")]
[Description("是否选中")]
public bool Checked
{
get { return _checked; }
set
{
_checked = value;
this.Invalidate();
//激活触发事件
this.MouseDown_G?.Invoke(this, null);
}
}
private string falseText = "关闭";
[Browsable(true)] //说明:文本关闭
[Category("布局_G")]
[Description("文本关闭")]
public string FalseText
{
get { return falseText; }
set { falseText = value; this.Invalidate(); }
}
//样式切换
public enum SwType
{
Ellipse, //椭圆
Rectangle, //矩形
}
private SwType switchType = SwType.Ellipse;
[Browsable(true)] //说明:切换样式
[Category("布局_G")]
[Description("切换样式")]
public SwType SwitchType
{
get { return switchType; }
set { switchType = value; this.Invalidate(); }
}
private Color sliderColor = Color.White; //Color.White
[Browsable(true)] //说明:滑块颜色
[Category("布局_G")]
[Description("滑块颜色")]
public Color SliderColor
{
get { return sliderColor; }
set { sliderColor = value; this.Invalidate(); }
}
#endregion
属性名称在控件属性树中的排列如何定义?
答:根据属性说明安装A~Z的字母顺序排列
2.画布重绘
- 画带四角圆弧的矩形、滑块、文本;
- 画椭圆、滑块、文本
#region 画布
private Graphics graphics;
private int width;
private int height;
//矩形绘制
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
graphics = e.Graphics;
graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
this.width = this.Width;
this.height = this.Height;
if (this.switchType == SwType.Rectangle) //字段选择为矩形时
{
//填充色
Color fillColor = this._checked ? trueColor : falseColor;
//带四角圆弧的矩形
GraphicsPath path = new GraphicsPath();
int diameter = 10; //默认圆弧直径
//左上角圆弧:起始坐标,宽,高,开始角度,扫描角度
path.AddArc(0, 0, diameter, diameter, 180f, 90f);
path.AddArc(this.width - diameter, 0, diameter, diameter, 270f, 90f); //右上角
path.AddArc(this.width - diameter, this.height - diameter, diameter, diameter, 0f, 90f); //右下角
path.AddArc(0, this.height - diameter, diameter, diameter, 90f, 90f); //左下角
graphics.FillPath(new SolidBrush(fillColor), path); //填充色
//文本
string strText = this._checked ? trueText : falseText;
//滑块(true\false 两种形态)
if (_checked)
{
//绘制滑块
path = new GraphicsPath();
int sliderwidth = this.height - 4;
path.AddArc(this.width - sliderwidth - 2, 2, diameter, diameter, 180f, 90f);
path.AddArc(this.width - diameter - 2, 2, diameter, diameter, 270f, 90f);
path.AddArc(this.width - diameter - 2, this.height - diameter - 2, diameter, diameter, 0f, 90f);
path.AddArc(this.width - sliderwidth - 2, this.height - diameter - 2, diameter, diameter, 90f, 90f);
graphics.FillPath(new SolidBrush(sliderColor), path);
//绘制文本
Rectangle rec = new Rectangle(0, 0, this.width - sliderwidth - 2, this.height);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
graphics.DrawString(strText, DisplayFont, new SolidBrush(sliderColor), rec, sf);
}
else
{
//绘制滑块
path = new GraphicsPath();
int sliderwidth = this.height - 4;
path.AddArc(2, 2, diameter, diameter, 180f, 90f);
path.AddArc(sliderwidth - diameter + 2, 2, diameter, diameter, 270f, 90f);
path.AddArc(sliderwidth - diameter + 2, sliderwidth - diameter + 2, diameter, diameter, 0f, 90f);
path.AddArc(2, sliderwidth - diameter + 2, diameter, diameter, 90f, 90f);
graphics.FillPath(new SolidBrush(sliderColor), path);
//绘制文本
Rectangle rec = new Rectangle(sliderwidth + 2, 0, this.width - sliderwidth - 2, this.height);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
graphics.DrawString(strText, DisplayFont, new SolidBrush(sliderColor), rec, sf);
}
}
else if (this.switchType == SwType.Ellipse) //字段选择为椭圆时
{
//填充色
Color fillColor = this._checked ? trueColor : falseColor;
//椭圆形
GraphicsPath path = new GraphicsPath();
path.AddArc(1, 1, this.height - 2, this.height - 2, 90f, 180f);
path.AddArc(this.width - (this.height - 2) - 1, 1, this.height - 2, this.height - 2, 270f, 180f);
graphics.FillPath(new SolidBrush(fillColor), path); //填充色
//文本
string strText = this._checked ? TrueText : falseText;
//滑块(true\false 两种形态)
if (_checked)
{
//绘制滑块
int ciclewidth = this.height - 6;
graphics.FillEllipse(new SolidBrush(sliderColor), new Rectangle(this.width - ciclewidth - 3, 3, ciclewidth, ciclewidth));
//绘制文本
Rectangle rec = new Rectangle(0, 0, this.width - ciclewidth - 3, this.height);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
graphics.DrawString(strText, DisplayFont, new SolidBrush(sliderColor), rec, sf);
}
else
{
//绘制滑块
int ciclewidth = this.height - 6;
graphics.FillEllipse(new SolidBrush(sliderColor), new Rectangle(3, 3, ciclewidth, ciclewidth));
//绘制文本
Rectangle rec = new Rectangle(ciclewidth + 3, 0, this.width - ciclewidth - 3, this.height);
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
graphics.DrawString(strText, DisplayFont, new SolidBrush(sliderColor), rec, sf);
}
}
}
#endregion
3.添加事件
理解 :在From中控件的鼠标点击事件的执行过程
先执行控件内部的MouseDown方法——其方法内部的属性——其属性中的触发事件——最后执行From后台的点击生成的自定义方法(可自定义)
其他技巧: 应用控件时拉出来双击即可生成自定义方法
<From中双击控件默认是Load方法,想让他自动生成自己设置的事件需要在控件代码中添加:[DefaultEvent("MouseDown_G")]>。
//指定默认事件(双击控件进入)
[DefaultEvent("MouseDown_G")]
关键代码:点击控件弹出框确认后再执行From的事件中的代码
//事件声明 public event EventHandler MouseDown_G;
//激活事件 this.MouseDown_G?.Invoke(this, null); ——执行完成跳转到From中的双击事件方法中
//构造函数添加鼠标点击事件——点击控件事件处理
this.MouseDown += Toggle_MouseDown;
//构造函数添加事件处理后自动生成此方法(无需在控件的属性中双击)
private void Toggle_MouseDown(object sender, MouseEventArgs e)
{
DialogResult dr = MessageBox.Show("二次确认操作?", "提示您", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
if (dr == DialogResult.OK)
{
Checked = !Checked;
}
else return;
}
发现一个错误,当应用该控件时,在From中点击无效;经过两天的查询(断点查询)才发现问题所在,在Form的设计器中的From属性的Enable为False,改为true才可使能
原因:控件更新后没有及时生成导致From崩盘后(空窗口后没在意),导致Designer的默认代码更改。
End
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标签:控件,自定义,diameter,C#,height,90f,new,path From: https://www.cnblogs.com/guoenshuo/p/18391635