CWinForm控件美化扩展系列之ListView

1、先看效果:叱ListViewEkSaalllcon.示例X.Item-3Item-4Itein-5Item-6.Item-8ItewlONET口带的ListView控件本身就有部分BUG,例如当设置显示模式设为Tile（平铺）样式的时候，选择不同的项，就会有些选择后的背景没有完全刷新，会留下部分聚焦框。在美化的过程中，我尽量注意了这些问题，但是也没有做过多的测试，也有可能存在一些问题，首先说一下到目前已经实现了的和没有实现的功能。实现的功能：1、换边框颜色。2、当显示模式为Details和List时，间隔的项显示不同的背景色。3、当显示模式为Details时，对列表头的美化。4、各种显示样式（

2、Largelcon、Smalllcon、List、Tile、Details）的项选择后的背景美化。没有实现的功能：1、不支持显示CheckBox.这个不是不能画出來，问题是获取不到CheckBox显示的位置,因为只有点击的是系统默认的CheckBox的位置，那个项才会被选中，口己绘制的CheckBox跟默认的的位置不对的话，点击了是没用的。所以就没有支持CheckBoxo对各个项的绘制，可以通过GetBounds方法得到图标和文本的所在位置和大小，就是没有获取CheckBox的。Largelcon、Smalllcon、List显示样式的绘制比较容易，Details样式的绘制需要注意的FullR

3、。応elect不同设置时背景的绘制，Tile样式的文本绘制麻烦些，需要分別计算每个Subitem的文本的位置和大小。图标的绘制在项不选中的情况下很简单，选中后要实现想系统口带的那种效果需要要到API函数：ImageList-Getlcon,具体的方法，来看看全部的绘制代码吧:tfregionDrawMethodsinternalvoidDrawItemlnternal(DrawListViewItemEventArgse)if(base.View二二View.Details)return;Graphicsg=eGraphics;ListViewItemitem二e.Item;ListViewI

4、temStatesitemState二e.State;ImageListimageList二item.ImageList;e.DrawBackground();boolbDrawImage二(imageList!二null)&(item.ImageIndex!二T!stringIsNullOrEmpty(item.ImageKey);boolbSelected二(itemState&ListViewItemStatesSelected)!二0;if(bDrawlmage)Drawlmage(g,item,bSelected);if(!stringIsNullOrEmpty(item.Text)

5、RectangletextRect二item.GetBounds(ItemBoundsPortion.Labe1,);DrawBackground(g,e.Itemindex,textRecbSelected);DrawText(g,item,textRect,bSelected);privatevoidDrawlmage(Graphicsg,2;2;ListViewItemitem,boolselected)ImageListimageList二item.ImageList;SizeimageSize二imageListImageSize;RectangleimageRect二item.Ge

6、tBounds(ItemBoundsPortion.Icon);if(imageRectWidthimageSizeWidth)imageRectX+二(imageRectWidth一imageSizeWidth)/2;imageRectWidth二imageSizeWidth;if(imageRectHeightimageSizeHeight)imageRect.Y+二(imageRect.Height一imageSize.Height)/imageRect.Height二imageSize.Height;intimageIndex二item.Imageindex!二T?item.Image

7、Index:imageListImagesIndexOfKey(item.ImageKey);if(selected)IntPtrhlcon二NativeMethodsImageList_GetIcon(imageListHandle,imageIndex,(int)NativeMethodsImageListDrawFlagsILD_SELECTED);gDrawlcon(lcon.FromHandle(hlcon),imageRect);NativeMethodsDestroylcon(hlcon);elseImageimage二imageListImagesimageIndex;gDra

8、wlmage(image,imageRect,0,0,imageWidth，imageHeight,GraphicsUnitPixel);privatevoidDrawBackground(Graphicsg,intitemlndex,Rectanglerect,boolselected)switch(baseView)caseView.Smalllcon:caseViewList:rect.Inflate(T,0);break;if(selected)ColorbaseColor二_selectedColor;ColorborderColor二selectedColor:*Colorinne

9、rBorderColor二Color.FromArgb(150,255，255，255);RenderBackgroundlnternal(g,recbaseColor,borderColor,innerBorderColor,0.45f,true,r)LinearGradientModeVertical);elseif(baseView二二View.List)ColorbackColor二itemIndex%2二二0?rowBackColorl:_rowBackCo1or2;using(SolidBrushbrush二newSolidBrush(backColog.FillRectangle

10、(brush,rect);privatevoidDrawText(Graphicsg,ListViewItemitem,RectangletextRect,boolselected)StringFormatsf二StringFormatGenericTypographic;switch(baseView)caseView.Largelcon：sf.Alignment二StringAlignmentCenter;sf.LineAlignment二StringAlignment.Near;sf.Trimming二StringTrimmingEllipsisCharacter;sf.FormatFl

11、ags&二(StringFormatFlags.LineLimit);if(selected)sf.FormatFlags&二StringFormatFlags.NoWrap;break;caseView.List:caseView.Smalllcon：textRect.Inflate(-1,0);sfAlignment二StringAlignmentNear:sf.LineAlignment二StringAlignmentCenter;sf.Trimming二StringTrimmingEllipsisCharacter;sf.FormatFlags&二(StringFormatFlags.

12、LineLimit);break;caseView.Tile：textRect.Inflate(-2,0);sf.Alignment二StringAlignmentNear:sf.LineAlignment二StringAlignmentCenter;sf.Trimming二StringTrimmingEllipsisCharacter;sf.FormatFlags|=StringFormatFlags.NoWrap;break;if(base.View!二View.Tile|item.SubitemsCount二二1)using(Brushbrush二newSolidBrush(itemFo

13、reColor)g.DrawSt:ring(itemText,item.Font，brush,textRect,sf)；elsestringsubltemText二“A;intheight:boolbBreak二false;RectanglesunltemTextRect二textRect;Subitems)foreach(ListViewItem.ListViewSubItemsubIteminitem.Subitems)if(!stringIsNullOrEmpty(subItem.Text)subltemText二subItem.Text:height二TextRendererMeasu

14、reText(g,subltem.Text,subitem.Font)Height;sunltemTextRect.Height二height:if(sunltemTextRectBottomtextRectBottom)sunltemTextRect.Height二textRectBottom一sunltemTextRectY:bBreak二true;using(Brushbrush二newSolidBrush(subltem.ForeColor)g.DrawString(subltemText,subItemFont,brush,sunltemTextRect，sf)；sunltemTex

15、tRect.Y+二height:if(bBreak)break;privatevoidDrawSubitemDetaiIs(DrawListViewSubItemEventArgse)Rectanglebounds二e.Bounds:ListViewItemStatesitemState二e.ItemState;Graphicsg=eGraphics;ListViewItemitem二e.Item;boolbSelected二(itemState&ListViewItemStatesSelected)!二0;boolbDrawImage二false;boolbFistltem二false;in

16、timagelndex二-1;if(e.ColumnIndex二二0)bFistltem二true:if(item.ImageList!二null)if(item.Imageindex!二T)imageIndex二itemImageindex;elseif(!stringIsNullOrEmpty(item.ImageKey)imageIndex二itemImageListImagesIndexOfKey(item.ImageKey);if(imagelndex!二T)bDrawlmage二true;RectanglebackRect二bounds:RectangleimageRect二Rec

17、tangleEmpty;if(bDrawlmage)imageRect二itemGetBounds(ItemBoundsPortion.Icon);backRect二item.GetBounds(It.emBoundsPortion.Label);backRect.X+=2;backRect.Width-二2;if(bSelected&(baseFullRowSelect(!base.FullRowSelect&bFistItem)backRectHeight一一;ColorbaseColor二_selectedColor;ColorborderColor二selectedColor:*Col

18、orinnerBorderColor二ColorFromArgb(150,255，255,255);RenderBackgroundlnternal(g，backRect,baseColor,borderColor,innerBorderColor,0.45f,false,LinearGradientModeVertical);if(!baseFullRowSelect&bFistltern)backRectWidth-一;using(Penpen二newPen(borderColor)g.DrawRectangle(pen，backRect);backRect.Width+;elsePoin

19、tpoints二newPoint4;points0二newPoint(backRectX，backRectY);points1二newPoint(backRectRight,backRectY):points2二newPoint(backRectRight,backRectBottom);points3二newPoint(backRectX，backRectBottom);using(Penpen二newPen(borderColor)if(bFistItem)gDrawLine(pen,points0,points1);g.DrawLine(pen,points0,points3);gDra

20、wLine(pen,points2,points3);if(e.ColumnIndex二二ColumnCount一1)points1X-；points2X-；g.DrawLine(pen,points0,points1)g.DrawLine(pen,points1,points2)g.DrawLine(pen,points2,points3)elseg.DrawLine(pen,points0,points1)g.DrawLine(pen,points2,points3)elseColorbackColor二e.Itemindex%2二二0?_rowBackColor1:_rowBackCo1or2;using(SolidBrushbrush二newSolidBrush(backColor)gFillRectangle(brush,backRect);TextFormatFlagsflags二GetFormatFlags(eHeader.TextAlign);if