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对TabControl的简单优化

  之前由于忙于赶项目进度而忽视了软件的用户体验,界面挺难看,有一天看见组长优化了某个窗体,让人感觉完全不一样,我也不甘示弱,要把我的程序做顺眼一点才行。我的程序是一个以TabControl为主要容器的窗体,这样的程序窗体在目前广泛使用,谷歌浏览器Chrome,360安全卫士,QQ,鲁大师等。

 

重点是头部的TabItem的变迁,从文字到图标结合文字和单纯图标,让TabControl以一种比较友好的形式融入到界面中去。先看看控件的效果

为了让新的TabControl能适应三种情况(文字,图标下衬文字,图标),就定义了如下枚举,

1         public enum TabTypeEnum2         {3             ImageText,4             Text,5             Image,6         }

 

同时在新的TabControl类里面定义了对应的属性TabType和私有字段_tabType

        private TabTypeEnum _tabType;        public TabTypeEnum TabType        {            get { return _tabType; }            set            {                _tabType = value;                if (TabType != TabTypeEnum.Text)                {                    SetStyle(ControlStyles.UserPaint |                                           ControlStyles.OptimizedDoubleBuffer |                                 ControlStyles.AllPaintingInWmPaint |                               ControlStyles.ResizeRedraw |                                        ControlStyles.SupportsTransparentBackColor,                         true);                    base.UpdateStyles();                    this.SizeMode = TabSizeMode.Fixed;                }                else                {                    SizeMode = defaultSizeModel;                    this.Size = defaultSize;                }            }        }

在改变Tab的类型时要额外加一些处理逻辑,如果是Tab包含图标的,肯定要对控件的Style进行设置

SetStyle(ControlStyles.UserPaint |                                           ControlStyles.OptimizedDoubleBuffer |                               ControlStyles.AllPaintingInWmPaint |
ControlStyles.ResizeRedraw | ControlStyles.SupportsTransparentBackColor, true); base.UpdateStyles();

 

这里设置的都与重绘控件时有关:双缓冲,改变大小则重绘控件。对于单纯图标还有图标+文字,单纯文字这三种方式的Tab大小会有所不同,这个Tab的大小通过ItemSize设置,这里我默认设置了纯文字则按回它初始值的大小,这个初始值在构造函数里获取;图标+文字和纯图标这两种方式在重绘时计算设置。

  描绘控件又是去重写OnPaint方法,这样又用回疏远了很久的GDI+去描绘这个TabItem。这里有三种Tab方式,但着重介绍图标+文字这种方式,Tab选中会有阴影的,阴影可以自己PS一个圆角矩形,我这个是网上抠别人的,这个图片已添加“已有项”的形式添加到项目中,然后生成操作选“嵌入资源”。

然后在构造函数里面以下面的形式获取阴影图片资源

backImage = new Bitmap(this.GetType(), "select_background.jpg");

 

在绘图时,先绘阴影,再绘文字,最后绘图标。

获取当前Tab的矩形主要通过TabControl的GetTabRect(int index)方法,通过判断当前的Tab是不是被选中的,来决定绘不绘制阴影

                if (this.SelectedIndex == i)                {                    e.Graphics.DrawImage(backImage, this.GetTabRect(i));                }

然后根据Tab文字的Size来决定TabSize,

                if (this.ItemSize.Width < (textSize.Width + this.Padding.X * 2))                    this.ItemSize =                        new System.Drawing.Size((int)textSize.Width + this.Padding.X * 2,                            this.ItemSize.Height);                if (this.ItemSize.Height < (int)textSize.Height + ImageList.ImageSize.Height + this.Padding.Y * 2)                    new System.Drawing.Size(this.ItemSize.Width,                        (int)textSize.Height + ImageList.ImageSize.Height + this.Padding.Y * 2);

然后按照文字的Size还有Tab矩形的位置大小计算出文字的位置,描绘出文字

                textPoint.X                    = bounds.X + (bounds.Width - textSize.Width) / 2;                textPoint.Y                    = bounds.Bottom - textSize.Height - this.Padding.Y;                e.Graphics.DrawString(                    this.TabPages[i].Text,                    this.Font,                    SystemBrushes.ControlText,                        textPoint.X,                    textPoint.Y);

最后描绘图标也是结合了图标的Size和Tab的位置与大小来决定图标所在的位置,

                    e.Graphics.DrawImage(                        icon,                        bounds.X + (bounds.Width - icon.Width) / 2,                        bounds.Top + this.Padding.Y);

加上了这行代码,能让描绘出来的文字少点锯齿

e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;  

Tab的描绘就完成了,其余两种Tab只是省去了文字部分或者图标部分的描绘而已,两部分的代码都会在最后列举整个控件源码时顺带列举出来。

         这个控件很大程度上参考了CSDN网友的源码,原本的博文一下子找不出来,要是哪位园友知道的顺带告诉我,我作为参考链接附在文中,谢谢!

  1     class ImageTabControl:TabControl  2     {  3         public enum TabTypeEnum  4         {  5             ImageText,  6             Text,  7             Image,  8         }  9  10         Image backImage; 11         Size defaultSize; 12         TabSizeMode defaultSizeModel; 13  14         public ImageTabControl() 15         { 16             defaultSize = this.ItemSize; 17             defaultSizeModel = this.SizeMode; 18  19             this.TabType = TabTypeEnum.ImageText; 20             backImage = new Bitmap(this.GetType(), "select_background.jpg"); 21         } 22  23         private TabTypeEnum _tabType; 24         public TabTypeEnum TabType 25         { 26             get { return _tabType; } 27             set 28             { 29                 _tabType = value; 30                 if (TabType != TabTypeEnum.Text) 31                 { 32                     SetStyle(ControlStyles.UserPaint |                      // 控件将自行绘制,而不是通过操作系统来绘制   33                      ControlStyles.OptimizedDoubleBuffer |          // 该控件首先在缓冲区中绘制,而不是直接绘制到屏幕上,这样可以减少闪烁   34                      ControlStyles.AllPaintingInWmPaint |           // 控件将忽略 WM_ERASEBKGND 窗口消息以减少闪烁   35                      ControlStyles.ResizeRedraw |                   // 在调整控件大小时重绘控件   36                      ControlStyles.SupportsTransparentBackColor,    // 控件接受 alpha 组件小于 255 的 BackColor 以模拟透明   37                      true); 38                     base.UpdateStyles(); 39  40                     this.SizeMode = TabSizeMode.Fixed; 41                 } 42                 else 43                 { 44  45                     SizeMode = defaultSizeModel; 46                     this.Size = defaultSize; 47                 } 48             } 49         } 50  51         protected override void OnPaint(PaintEventArgs e) 52         { 53             base.OnPaint(e); 54  55             if (TabType == TabTypeEnum.ImageText) 56                 DrawImageTextItem(e); 57             else if (TabType == TabTypeEnum.Image) 58                 DrawImageItem(e); 59             else if (TabType == TabTypeEnum.Text) 60                 DrawTextItem(e); 61         } 62  63         protected virtual void DrawImageTextItem(PaintEventArgs e) 64         { 65             for (int i = 0; i < this.TabCount; i++) 66             { 67                 //e.Graphics.DrawRectangle(Pens.Red, this.GetTabRect(i)); 68                 if (this.SelectedIndex == i) 69                 { 70                     e.Graphics.DrawImage(backImage, this.GetTabRect(i)); 71                 } 72  73                 // Calculate text position   74                 Rectangle bounds = this.GetTabRect(i); 75                 PointF textPoint = new PointF(); 76                 SizeF textSize = TextRenderer.MeasureText(this.TabPages[i].Text, this.Font); 77  78                 if (this.ItemSize.Width < (textSize.Width + this.Padding.X * 2)) 79                     this.ItemSize = 80                         new System.Drawing.Size((int)textSize.Width + this.Padding.X * 2, 81                             this.ItemSize.Height); 82                 if (this.ItemSize.Height < (int)textSize.Height + ImageList.ImageSize.Height + this.Padding.Y * 2) 83                     new System.Drawing.Size(this.ItemSize.Width, 84                         (int)textSize.Height + ImageList.ImageSize.Height + this.Padding.Y * 2); 85  86                 // 注意要加上每个标签的左偏移量X   87                 textPoint.X 88                     = bounds.X + (bounds.Width - textSize.Width) / 2; 89                 textPoint.Y 90                     = bounds.Bottom - textSize.Height - this.Padding.Y; 91  92                 // Draw highlights   93                 e.Graphics.DrawString( 94                     this.TabPages[i].Text, 95                     this.Font, 96                     SystemBrushes.ControlLightLight,    // 高光颜色   97                     textPoint.X, 98                     textPoint.Y); 99 100                 // 绘制正常文字  101                 textPoint.Y--;102                 e.Graphics.DrawString(103                     this.TabPages[i].Text,104                     this.Font,105                     SystemBrushes.ControlText,    // 正常颜色  106                     textPoint.X,107                     textPoint.Y);108 109 110                 if (this.ImageList != null)111                 {112                     int index = this.TabPages[i].ImageIndex;113                     string key = this.TabPages[i].ImageKey;114                     Image icon = new Bitmap(1, 1);115 116                     if (index > -1)117                     {118                         icon = this.ImageList.Images[index];119                     }120                     if (!string.IsNullOrEmpty(key))121                     {122                         icon = this.ImageList.Images[key];123                     }124                     e.Graphics.DrawImage(125                         icon,126                         bounds.X + (bounds.Width - icon.Width) / 2,127                         bounds.Top + this.Padding.Y);128                 }129             }130 131             e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;  132         }133 134         protected virtual void DrawImageItem(PaintEventArgs e)135         {136             for (int i = 0; i < this.TabPages.Count; i++)137             {138                 if (i == this.SelectedIndex)139                 {140                     e.Graphics.DrawImage(backImage, this.GetTabRect(i));141                 }142 143                 RectangleF itemRec = this.GetTabRect(i);144 145                 if (ImageList != null)146                 { 147                     int imageIndex=this.TabPages[i].ImageIndex;148                     string imageKey=this.TabPages[i].ImageKey;149                     Image ico=new Bitmap(1,1);150                     if (imageIndex >= 0)151                         ico = this.ImageList.Images[i];152                     if (!string.IsNullOrEmpty(imageKey))153                         ico = this.ImageList.Images[imageKey];154 155                     if (this.ItemSize.Height < ImageList.ImageSize.Height + this.Padding.Y * 2)156                         this.ItemSize = new System.Drawing.Size(this.ItemSize.Width,157                             ImageList.ImageSize.Height + this.Padding.Y * 2);158                     if (this.ItemSize.Width < ImageList.ImageSize.Width + this.Padding.X * 2)159                         this.ItemSize = new System.Drawing.Size(ImageList.ImageSize.Width + this.Padding.X * 2,160                             this.ItemSize.Height);161 162                     e.Graphics.DrawImage(ico, itemRec.X + (itemRec.Width - ico.Width) / 2, itemRec.Y + this.Padding.Y);163                 }164             }165         }166 167         protected virtual void DrawTextItem(PaintEventArgs e)168         {169             for (int i = 0; i < this.TabCount; i++)170             {171                 //e.Graphics.DrawRectangle(Pens.Red, this.GetTabRect(i));172                 if (this.SelectedIndex == i)173                 {174                     e.Graphics.DrawImage(backImage, this.GetTabRect(i));175                 }176 177                 // Calculate text position  178                 Rectangle bounds = this.GetTabRect(i);179                 PointF textPoint = new PointF();180                 SizeF textSize = TextRenderer.MeasureText(this.TabPages[i].Text, this.Font);181 182                 // 注意要加上每个标签的左偏移量X  183                 textPoint.X184                     = bounds.X + (bounds.Width - textSize.Width) / 2;185                 textPoint.Y186                     = bounds.Y+(bounds.Height-textSize.Height)/2;187 188                 // Draw highlights  189                 e.Graphics.DrawString(190                     this.TabPages[i].Text,191                     this.Font,192                     SystemBrushes.ControlLightLight,    // 高光颜色  193                     textPoint.X,194                     textPoint.Y);195 196                 // 绘制正常文字  197                 textPoint.Y--;198                 e.Graphics.DrawString(199                     this.TabPages[i].Text,200                     this.Font,201                     SystemBrushes.ControlText,    // 正常颜色  202                     textPoint.X,203                     textPoint.Y);204 205             }206         }207     }
ImageTabControl

 

对TabControl的简单优化