Duilib实现类似电脑管家扫描目录效果

实现原理:

1.后台开线程遍历目录，遍历出一个文件路径在界面上更新显示(通过发消息通知主界面)

2.需要扩展一下Duilib控件，在此我扩展了CLabelUI，重写了PaintText函数

扩展控件的.h文件

 /*************************************************************************************************
 *
 * File Name    : UILabelEx.h
 *
 * Created      : 2016/11/11
 *
 * Author       : http://www.cnblogs.com/chechen/
 *
 * Model        :
 *
 * Description  : [[CN]] 扩展Label控件 [[CN]]
 *
 **************************************************************************************************/
 #ifndef _UILABELEX_H_
 #define _UILABELEX_H_

 class CLabelExUI : public CLabelUI
 {
 public:
     CLabelExUI(void);
     ~CLabelExUI(void);

     LPCTSTR GetClass() const;
     LPVOID GetInterface(LPCTSTR pstrName);

     void PaintText(HDC hDC);
     void SetPos(RECT rc);  

 private:
     Color _MakeRGB(int a, Color cl);
     Color _MakeRGB(int r, int g, int b);
 };
 #endif//_UILABELEX_H_

.cpp

 #include "StdAfx.h"
 #include "UILabelEx.h"

 CLabelExUI::CLabelExUI(void)
 {
 }

 CLabelExUI::~CLabelExUI(void)
 {
 }

 LPCTSTR CLabelExUI::GetClass() const
 {
     return TEXT("LabelExUI");
 }

 LPVOID CLabelExUI::GetInterface(LPCTSTR pstrName)
 {
     if( _tcscmp(pstrName, TEXT("LabelEx")) ==  ) return static_cast<CLabelExUI*>(this);
     return CLabelUI::GetInterface(pstrName);
 }

 Color CLabelExUI::_MakeRGB(int a, Color cl)
 {
     return Color(a, cl.GetR(), cl.GetG(), cl.GetB());
 }  

 Color CLabelExUI::_MakeRGB(int r, int g, int b)
 {
     return Color(, r, g, b);
 }  

 void CLabelExUI::SetPos(RECT rc)
 {
     __super::SetPos(rc);
 }  

 void CLabelExUI::PaintText(HDC hDC)
 {
     if( m_dwTextColor ==  ) m_dwTextColor = m_pManager->GetDefaultFontColor();
     if( m_dwDisabledTextColor ==  ) m_dwDisabledTextColor = m_pManager->GetDefaultDisabledColor();  

     RECT rc = m_rcItem;
     rc.left += m_rcTextPadding.left;
     rc.right -= m_rcTextPadding.right;
     rc.top += m_rcTextPadding.top;
     rc.bottom -= m_rcTextPadding.bottom;  

     if(!GetEnabledEffect())
     {
         if( m_sText.IsEmpty() ) return;
         int nLinks = ;
         if( IsEnabled() ) {
             if( m_bShowHtml )
                 CRenderEngine::DrawHtmlText(hDC, m_pManager, rc, m_sText, m_dwTextColor,
                 NULL, NULL, nLinks, DT_SINGLELINE | m_uTextStyle);
             else
             {
                  ASSERT(::GetObjectType(hDC)==OBJ_DC || ::GetObjectType(hDC)==OBJ_MEMDC);
                 ::SetBkMode(hDC, TRANSPARENT);
                 ::SetTextColor(hDC, RGB(GetBValue(m_dwTextColor), GetGValue(m_dwTextColor), GetRValue(m_dwTextColor)));
                 HFONT hOldFont = (HFONT)::SelectObject(hDC, m_pManager->GetFont(m_iFont));

                 SIZE size;
                 ::GetTextExtentPoint32(hDC,m_sText.GetData(),m_sText.GetLength(),&size);

                 UINT uStyle = ;
                 if(size.cx > rc.right - rc.left)
                 {
                     uStyle = DT_PATH_ELLIPSIS|DT_WORD_ELLIPSIS|DT_END_ELLIPSIS;
                 }
                 else
                 {
                     uStyle = DT_CENTER | DT_VCENTER | DT_SINGLELINE;
                 }
                 ::DrawText(hDC, m_sText, -, &rc, uStyle | DT_NOPREFIX);
                 ::SelectObject(hDC, hOldFont);
             }
         }
         else {
             if( m_bShowHtml )
                 CRenderEngine::DrawHtmlText(hDC, m_pManager, rc, m_sText, m_dwDisabledTextColor,
                 NULL, NULL, nLinks, DT_SINGLELINE | m_uTextStyle);
             else  {
                  ASSERT(::GetObjectType(hDC)==OBJ_DC || ::GetObjectType(hDC)==OBJ_MEMDC);
                 ::SetBkMode(hDC, TRANSPARENT);
                 ::SetTextColor(hDC, RGB(GetBValue(m_dwTextColor), GetGValue(m_dwTextColor), GetRValue(m_dwTextColor)));
                 HFONT hOldFont = (HFONT)::SelectObject(hDC, m_pManager->GetFont(m_iFont));

                 SIZE size;
                 ::GetTextExtentPoint32(hDC,m_sText.GetData(),m_sText.GetLength(),&size);

                 UINT uStyle = ;
                 if(size.cx > rc.right - rc.left)
                 {
                     uStyle = DT_PATH_ELLIPSIS|DT_WORD_ELLIPSIS|DT_END_ELLIPSIS;
                 }
                 else
                 {
                     uStyle = DT_CENTER | DT_VCENTER | DT_SINGLELINE;
                 }
                 ::DrawText(hDC, m_sText, -, &rc, uStyle | DT_NOPREFIX);
                 ::SelectObject(hDC, hOldFont);

                 //CRenderEngine::DrawText(hDC, m_pManager, rc, m_sText, m_dwDisabledTextColor,
                 //m_iFont, /* DT_SINGLELINE | */m_uTextStyle); ///< @todo
             }

         }
     }
     else
     {
         Font    nFont(hDC,m_pManager->GetFont(GetFont()));  

         Graphics nGraphics(hDC);
         nGraphics.SetTextRenderingHint(m_TextRenderingHintAntiAlias);  

         StringFormat format;
         format.SetAlignment((StringAlignment)m_hAlign);
         format.SetLineAlignment((StringAlignment)m_vAlign);  

         RectF nRc((float)rc.left,(float)rc.top,(float)rc.right-rc.left,(float)rc.bottom-rc.top);
         RectF nShadowRc = nRc;
         nShadowRc.X += m_ShadowOffset.X;
         nShadowRc.Y += m_ShadowOffset.Y;  

         int nGradientLength = GetGradientLength();  

         if(nGradientLength == )
             nGradientLength = (rc.bottom-rc.top);  

         LinearGradientBrush nLineGrBrushA(Point(GetGradientAngle(), ),Point(,nGradientLength),_MakeRGB(GetTransShadow(),GetTextShadowColorA()),_MakeRGB(GetTransShadow1(),GetTextShadowColorB() == -?GetTextShadowColorA():GetTextShadowColorB()));
         LinearGradientBrush nLineGrBrushB(Point(GetGradientAngle(), ),Point(,nGradientLength),_MakeRGB(GetTransText(),GetTextColor()),_MakeRGB(GetTransText1(),GetTextColor1() == -?GetTextColor():GetTextColor1()));  

         if(GetEnabledStroke() && GetStrokeColor() > )
         {
             LinearGradientBrush nLineGrBrushStroke(Point(GetGradientAngle(),),Point(,rc.bottom-rc.top+),_MakeRGB(GetTransStroke(),GetStrokeColor()),_MakeRGB(GetTransStroke(),GetStrokeColor()));  

 #ifdef _UNICODE
             nRc.Offset(-,);
             nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(,);
             nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(-,-);
             nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(,);
             nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(,-);
 #else
             USES_CONVERSION;
             wstring mTextValue = A2W(m_TextValue.GetData());  

             nRc.Offset(-,);
             nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(,);
             nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(-,-);
             nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(,);
             nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke);
             nRc.Offset(,-);
 #endif  

         }
 #ifdef _UNICODE
         if(GetEnabledShadow() && (GetTextShadowColorA() >  || GetTextShadowColorB() > ))
             nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nShadowRc,&format,&nLineGrBrushA);  

         nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushB);
 #else
         USES_CONVERSION;
         wstring mTextValue = A2W(m_TextValue.GetData());  

         if(GetEnabledShadow() && (GetTextShadowColorA() >  || GetTextShadowColorB() > ))
             nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nShadowRc,&format,&nLineGrBrushA);  

         nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushB);
 #endif  

     }
 }
   

转载:http://blog.csdn.net/chenlycly/article/details/24294639

参考QQ的效果，如下所示：

DT_END_ELLIPSIS：对于显示的字符串，如果结束的字符串的范围不在矩形内，它会被截断并以省略号标识。

DT_WORDBREAK：当一行中的字符将会延伸到由lpRect指定的矩形的边框时，此行自动地在字之间换行。

DT_WORD_ELLIPSIS：截短不符合矩形的正文，并增加省略号。

DT_PATH_ELLIPSIS：对于显示的字符串，会用省略号替换字符串中间的字符，以确保结果能在矩形范围内。 如果该字符串包含反斜杠（\）字符，它会尽可能的保留最后一个反斜杠之后的正文。

xml文件:

 <?xml version="1.0" encoding="UTF-8"?>
 <Window size="750,500"  caption="0,0,0,60" sizebox="0,0,0,0" roundcorner="4,4">
   <!-- 窗口的初始尺寸(宽500，高350) 标题栏拖拽区域(高32)、可拖拽边框大小(这里添加sizebox后就可以拖拽边框调整大小了) -->
   <Font name="微软雅黑" size="13"/>
   <Font name="微软雅黑" size="16" />
   <Font name="微软雅黑" size="16" bold="true"/>
   <Font name="微软雅黑" size="13" underline="true"/>
   <Font name="宋体" size="13" />
   <Font name="微软雅黑" size="13" />

   <VerticalLayout bkcolor="#FFCCCCCC" bordersize="2" bordercolor="#FFE5DED8" >
     <!-- 整个窗口的背景色 -->
     <!-- 标题栏区 -->
     <HorizontalLayout name="appbar" height="28"  bkcolor="#FF13A8E0">
       <Control width="100"/>
       <HorizontalLayout name="apptitle" >
         <Label text="DuiLibTraverseFolderDemo        http://www.cnblogs.com/chechen/" align="center" textcolor="#FFF5F6F7"/>
       </HorizontalLayout>
       <Button name="minbtn" padding="4,0,0,0" width="24" height="24" tooltip="最小化" normalimage="file='sysbtn/Min.png'" hotimage="file='sysbtn/Min_hot.png'"/>
       <Button name="maxbtn" padding="4,0,0,0" width="24" height="24" tooltip="最大化" normalimage="file='sysbtn/Max.png'" hotimage="file='sysbtn/Max_hot.png'"/>
       <Button name="restorebtn" padding="4,0,0,0" width="24" height="24" tooltip="还原" visible="false" normalimage="file='sysbtn/Restore.png'" hotimage="file='sysbtn/Restore_hot.png'"/>
       <Button name="closebtn" padding="4,0,0,0" width="24" height="24" tooltip="关闭" normalimage="file='sysbtn/Close.png'" hotimage="file='sysbtn/Close_hot.png'"/>
     </HorizontalLayout>

     <HorizontalLayout bkcolor="#FFFFFFFF">

       <Label  text="正在操作,请稍后..."  align="center" font="2"/>
       <LabelEx name="filepath" text="" float="true" pos="225,255,0,0" width="256"  height="20" font="0" />

     </HorizontalLayout>

   </VerticalLayout>
 </Window>

Demo:Duilib实现类似电脑管家扫描目录效果