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C#仿QQ皮肤－GroupBox 控件实现(一)

2013年10月30日 ⁄ 综合 ⁄ 共 16045字 ⁄ 字号 小 中 大 ⁄ 评论关闭

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                                                              http://www.cnblogs.com/sufei/archive/2010/03/10/1682847.html 

       

这一次我们先要研究一下系统的是怎么完成的

           我们使用Reflector反编译一下GroupBox一起来看看它的内部是怎么实现的。

 

从类的开始第一行我们可以看得出来它是继承Control这个类而来的，下面是所有引用的命名空间和继承的源

 

代码

 using System;
    using System.ComponentModel;
    using System.Drawing;
    using System.Drawing.Text;
    using System.Runtime.InteropServices;
    using System.Security;
    using System.Security.Permissions;
    using System.Windows.Forms.Internal;
    using System.Windows.Forms.Layout;
    using System.Windows.Forms.VisualStyles;

    [DefaultEvent("Enter"), Designer("System.Windows.Forms.Design.GroupBoxDesigner, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"), ClassInterface(ClassInterfaceType.AutoDispatch), DefaultProperty("Text"), ComVisible(true), System.Windows.Forms.SRDescription("DescriptionGroupBox")]
    public class GroupBox : Control
    {

 

其实这里告诉我们这样几个问题

1.所有引用的命名空间

2.默认的事件 DefaultEvent("Enter"), 

3.在实现设计时服务的类 System.Windows.Forms.Design.GroupBoxDesigner

4.为Com指定接口类型ClassInterface

5.默认的属性DefaultProperty("Text")

6.托管类型或是成员的Com可访问性ComVisible

7.继承自 public class GroupBox : Control

 

关于事件的注册

 

  我们以一个AutoSizeChanged事件来说明

  

EditorBrowsable(EditorBrowsableState.Always)

 

用上面的语句指定属性和方法是否在编辑器里的可见方式  在这里我们合作Always代表是编辑器里是始终可见的

然后让它显示在属性窗口中

 

 Browsable(true)

 

 

看一下MS的实现方式吧

 

代码


        [EditorBrowsable(EditorBrowsableState.Always), System.Windows.Forms.SRCategory("CatPropertyChanged"), System.Windows.Forms.SRDescription("ControlOnAutoSizeChangedDescr"), Browsable(true)]
        public event EventHandler AutoSizeChanged
        {
            add
            {
                base.AutoSizeChanged += value;
            }
            remove
            {
                base.AutoSizeChanged -= value;
            }
        }

 

 

 我们现在再来看Click事件的实现就更为简单了

  

代码

  [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced)]
        public event EventHandler Click
        {
            add
            {
                base.Click += value;
            }
            remove
            {
                base.Click -= value;
            }
        }

 

以后的事件基本上和这个差不多，就不再多说了

 

具体的实现

 

 

     我们一起来看看他的构造方法

 

代码

  public GroupBox()
        {
            base.SetState2(0x800, true);
            base.SetStyle(ControlStyles.ContainerControl, true);
            base.SetStyle(ControlStyles.SupportsTransparentBackColor | ControlStyles.ResizeRedraw | ControlStyles.UserPaint, this.OwnerDraw);
            base.SetStyle(ControlStyles.Selectable, false);
            this.TabStop = false;
        }

 

呵呵 ，其实这里跟我用来实现Combox控件时的情况差不了多少。

          DrawGroupBox事件的实现方法如果你看过我的Combox的实现的话应该很容易能看明白，

 

代码

 private void DrawGroupBox(PaintEventArgs e)
        {
            Graphics graphics = e.Graphics;
            Rectangle clientRectangle = base.ClientRectangle;
            int num = 8;
            Color disabledColor = base.DisabledColor;
            Pen pen = new Pen(ControlPaint.Light(disabledColor, 1f));
            Pen pen2 = new Pen(ControlPaint.Dark(disabledColor, 0f));
            clientRectangle.X += num;
            clientRectangle.Width -= 2 * num;
            try
            {
                Size size;
                int num2;
                if (this.UseCompatibleTextRendering)
                {
                    using (Brush brush = new SolidBrush(this.ForeColor))
                    {
                        using (StringFormat format = new StringFormat())
                        {
                            format.HotkeyPrefix = this.ShowKeyboardCues ? HotkeyPrefix.Show : HotkeyPrefix.Hide;
                            if (this.RightToLeft == RightToLeft.Yes)
                            {
                                format.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
                            }
                            size = Size.Ceiling(graphics.MeasureString(this.Text, this.Font, clientRectangle.Width, format));
                            if (base.Enabled)
                            {
                                graphics.DrawString(this.Text, this.Font, brush, clientRectangle, format);
                            }
                            else
                            {
                                ControlPaint.DrawStringDisabled(graphics, this.Text, this.Font, disabledColor, clientRectangle, format);
                            }
                        }
                        goto Label_01E7;
                    }
                }
                using (WindowsGraphics graphics2 = WindowsGraphics.FromGraphics(graphics))
                {
                    IntTextFormatFlags flags = IntTextFormatFlags.TextBoxControl | IntTextFormatFlags.WordBreak;
                    if (!this.ShowKeyboardCues)
                    {
                        flags |= IntTextFormatFlags.HidePrefix;
                    }
                    if (this.RightToLeft == RightToLeft.Yes)
                    {
                        flags |= IntTextFormatFlags.RightToLeft;
                        flags |= IntTextFormatFlags.Right;
                    }
                    using (WindowsFont font = WindowsGraphicsCacheManager.GetWindowsFont(this.Font))
                    {
                        size = graphics2.MeasureText(this.Text, font, new Size(clientRectangle.Width, 0x7fffffff), flags);
                        if (base.Enabled)
                        {
                            graphics2.DrawText(this.Text, font, clientRectangle, this.ForeColor, flags);
                        }
                        else
                        {
                            ControlPaint.DrawStringDisabled(graphics2, this.Text, this.Font, disabledColor, clientRectangle, (TextFormatFlags) flags);
                        }
                    }
                }
            Label_01E7:
                num2 = num;
                if (this.RightToLeft == RightToLeft.Yes)
                {
                    num2 += clientRectangle.Width - size.Width;
                }
                int num3 = Math.Min((int) (num2 + size.Width), (int) (base.Width - 6));
                int num4 = base.FontHeight / 2;
                graphics.DrawLine(pen, 1, num4, 1, base.Height - 1);
                graphics.DrawLine(pen2, 0, num4, 0, base.Height - 2);
                graphics.DrawLine(pen, 0, base.Height - 1, base.Width, base.Height - 1);
                graphics.DrawLine(pen2, 0, base.Height - 2, base.Width - 1, base.Height - 2);
                graphics.DrawLine(pen2, 0, num4 - 1, num2, num4 - 1);
                graphics.DrawLine(pen, 1, num4, num2, num4);
                graphics.DrawLine(pen2, num3, num4 - 1, base.Width - 2, num4 - 1);
                graphics.DrawLine(pen, num3, num4, base.Width - 1, num4);
                graphics.DrawLine(pen, (int) (base.Width - 1), (int) (num4 - 1), (int) (base.Width - 1), (int) (base.Height - 1));
                graphics.DrawLine(pen2, base.Width - 2, num4, base.Width - 2, base.Height - 2);
            }
            finally
            {
                pen.Dispose();
                pen2.Dispose();
            }
        }

 

   在这里不得不说MS的方法没有多少高明之处啊，不过还是值得我敬佩的

我把所有的代码都放上来大家参考一下吧，然后再接着说我的控件是怎么实现的

 

代码

namespace System.Windows.Forms
{
    using System;
    using System.ComponentModel;
    using System.Drawing;
    using System.Drawing.Text;
    using System.Runtime.InteropServices;
    using System.Security;
    using System.Security.Permissions;
    using System.Windows.Forms.Internal;
    using System.Windows.Forms.Layout;
    using System.Windows.Forms.VisualStyles;

    [DefaultEvent("Enter"), Designer("System.Windows.Forms.Design.GroupBoxDesigner, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"), ClassInterface(ClassInterfaceType.AutoDispatch), DefaultProperty("Text"), ComVisible(true), System.Windows.Forms.SRDescription("DescriptionGroupBox")]
    public class GroupBox : Control
    {
        private Font cachedFont;
        private System.Windows.Forms.FlatStyle flatStyle = System.Windows.Forms.FlatStyle.Standard;
        private int fontHeight = -1;

        [EditorBrowsable(EditorBrowsableState.Always), System.Windows.Forms.SRCategory("CatPropertyChanged"), System.Windows.Forms.SRDescription("ControlOnAutoSizeChangedDescr"), Browsable(true)]
        public event EventHandler AutoSizeChanged
        {
            add
            {
                base.AutoSizeChanged += value;
            }
            remove
            {
                base.AutoSizeChanged -= value;
            }
        }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced)]
        public event EventHandler Click
        {
            add
            {
                base.Click += value;
            }
            remove
            {
                base.Click -= value;
            }
        }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced)]
        public event EventHandler DoubleClick
        {
            add
            {
                base.DoubleClick += value;
            }
            remove
            {
                base.DoubleClick -= value;
            }
        }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced)]
        public event KeyEventHandler KeyDown
        {
            add
            {
                base.KeyDown += value;
            }
            remove
            {
                base.KeyDown -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event KeyPressEventHandler KeyPress
        {
            add
            {
                base.KeyPress += value;
            }
            remove
            {
                base.KeyPress -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event KeyEventHandler KeyUp
        {
            add
            {
                base.KeyUp += value;
            }
            remove
            {
                base.KeyUp -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event MouseEventHandler MouseClick
        {
            add
            {
                base.MouseClick += value;
            }
            remove
            {
                base.MouseClick -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event MouseEventHandler MouseDoubleClick
        {
            add
            {
                base.MouseDoubleClick += value;
            }
            remove
            {
                base.MouseDoubleClick -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event MouseEventHandler MouseDown
        {
            add
            {
                base.MouseDown += value;
            }
            remove
            {
                base.MouseDown -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event EventHandler MouseEnter
        {
            add
            {
                base.MouseEnter += value;
            }
            remove
            {
                base.MouseEnter -= value;
            }
        }

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced)]
        public event EventHandler MouseLeave
        {
            add
            {
                base.MouseLeave += value;
            }
            remove
            {
                base.MouseLeave -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event MouseEventHandler MouseMove
        {
            add
            {
                base.MouseMove += value;
            }
            remove
            {
                base.MouseMove -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event MouseEventHandler MouseUp
        {
            add
            {
                base.MouseUp += value;
            }
            remove
            {
                base.MouseUp -= value;
            }
        }

        [EditorBrowsable(EditorBrowsableState.Advanced), Browsable(false)]
        public event EventHandler TabStopChanged
        {
            add
            {
                base.TabStopChanged += value;
            }
            remove
            {
                base.TabStopChanged -= value;
            }
        }

        public GroupBox()
        {
            base.SetState2(0x800, true);
            base.SetStyle(ControlStyles.ContainerControl, true);
            base.SetStyle(ControlStyles.SupportsTransparentBackColor | ControlStyles.ResizeRedraw | ControlStyles.UserPaint, this.OwnerDraw);
            base.SetStyle(ControlStyles.Selectable, false);
            this.TabStop = false;
        }

        protected override AccessibleObject CreateAccessibilityInstance()
        {
            return new GroupBoxAccessibleObject(this);
        }

        private void DrawGroupBox(PaintEventArgs e)
        {
            Graphics graphics = e.Graphics;
            Rectangle clientRectangle = base.ClientRectangle;
            int num = 8;
            Color disabledColor = base.DisabledColor;
            Pen pen = new Pen(ControlPaint.Light(disabledColor, 1f));
            Pen pen2 = new Pen(ControlPaint.Dark(disabledColor, 0f));
            clientRectangle.X += num;
            clientRectangle.Width -= 2 * num;
            try
            {
                Size size;
                int num2;
                if (this.UseCompatibleTextRendering)
                {
                    using (Brush brush = new SolidBrush(this.ForeColor))
                    {
                        using (StringFormat format = new StringFormat())
                        {
                            format.HotkeyPrefix = this.ShowKeyboardCues ? HotkeyPrefix.Show : HotkeyPrefix.Hide;
                            if (this.RightToLeft == RightToLeft.Yes)
                            {
                                format.FormatFlags |= StringFormatFlags.DirectionRightToLeft;
                            }
                            size = Size.Ceiling(graphics.MeasureString(this.Text, this.Font, clientRectangle.Width, format));
                            if (base.Enabled)
                            {
                                graphics.DrawString(this.Text, this.Font, brush, clientRectangle, format);
                            }
                            else
                            {
                                ControlPaint.DrawStringDisabled(graphics, this.Text, this.Font, disabledColor, clientRectangle, format);
                            }
                        }
                        goto Label_01E7;
                    }
                }
                using (WindowsGraphics graphics2 = WindowsGraphics.FromGraphics(graphics))
                {
                    IntTextFormatFlags flags = IntTextFormatFlags.TextBoxControl | IntTextFormatFlags.WordBreak;
                    if (!this.ShowKeyboardCues)
                    {
                        flags |= IntTextFormatFlags.HidePrefix;
                    }
                    if (this.RightToLeft == RightToLeft.Yes)
                    {
                        flags |= IntTextFormatFlags.RightToLeft;
                        flags |= IntTextFormatFlags.Right;
                    }
                    using (WindowsFont font = WindowsGraphicsCacheManager.GetWindowsFont(this.Font))
                    {
                        size = graphics2.MeasureText(this.Text, font, new Size(clientRectangle.Width, 0x7fffffff), flags);
                        if (base.Enabled)
                        {
                            graphics2.DrawText(this.Text, font, clientRectangle, this.ForeColor, flags);
                        }
                        else
                        {
                            ControlPaint.DrawStringDisabled(graphics2, this.Text, this.Font, disabledColor, clientRectangle, (TextFormatFlags) flags);
                        }
                    }
                }
            Label_01E7:
                num2 = num;
                

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