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
1 /************************************************************************************************* 2 * 3 * File Name : UILabelEx.h 4 * 5 * Created : 2016/11/11 6 * 7 * Author : http://www.cnblogs.com/chechen/ 8 * 9 * Model : 10 * 11 * Description : [[CN]] 扩展Label控件 [[CN]] 12 * 13 **************************************************************************************************/ 14 #ifndef _UILABELEX_H_ 15 #define _UILABELEX_H_ 16 17 18 class CLabelExUI : public CLabelUI 19 { 20 public: 21 CLabelExUI(void); 22 ~CLabelExUI(void); 23 24 LPCTSTR GetClass() const; 25 LPVOID GetInterface(LPCTSTR pstrName); 26 27 void PaintText(HDC hDC); 28 void SetPos(RECT rc); 29 30 private: 31 Color _MakeRGB(int a, Color cl); 32 Color _MakeRGB(int r, int g, int b); 33 }; 34 #endif//_UILABELEX_H_
.cpp
1 #include "StdAfx.h" 2 #include "UILabelEx.h" 3 4 5 CLabelExUI::CLabelExUI(void) 6 { 7 } 8 9 10 CLabelExUI::~CLabelExUI(void) 11 { 12 } 13 14 15 LPCTSTR CLabelExUI::GetClass() const 16 { 17 return TEXT("LabelExUI"); 18 } 19 20 21 LPVOID CLabelExUI::GetInterface(LPCTSTR pstrName) 22 { 23 if( _tcscmp(pstrName, TEXT("LabelEx")) == 0 ) return static_cast<CLabelExUI*>(this); 24 return CLabelUI::GetInterface(pstrName); 25 } 26 27 28 Color CLabelExUI::_MakeRGB(int a, Color cl) 29 { 30 return Color(a, cl.GetR(), cl.GetG(), cl.GetB()); 31 } 32 33 34 Color CLabelExUI::_MakeRGB(int r, int g, int b) 35 { 36 return Color(255, r, g, b); 37 } 38 39 40 void CLabelExUI::SetPos(RECT rc) 41 { 42 __super::SetPos(rc); 43 } 44 45 46 void CLabelExUI::PaintText(HDC hDC) 47 { 48 if( m_dwTextColor == 0 ) m_dwTextColor = m_pManager->GetDefaultFontColor(); 49 if( m_dwDisabledTextColor == 0 ) m_dwDisabledTextColor = m_pManager->GetDefaultDisabledColor(); 50 51 RECT rc = m_rcItem; 52 rc.left += m_rcTextPadding.left; 53 rc.right -= m_rcTextPadding.right; 54 rc.top += m_rcTextPadding.top; 55 rc.bottom -= m_rcTextPadding.bottom; 56 57 if(!GetEnabledEffect()) 58 { 59 if( m_sText.IsEmpty() ) return; 60 int nLinks = 0; 61 if( IsEnabled() ) { 62 if( m_bShowHtml ) 63 CRenderEngine::DrawHtmlText(hDC, m_pManager, rc, m_sText, m_dwTextColor, 64 NULL, NULL, nLinks, DT_SINGLELINE | m_uTextStyle); 65 else 66 { 67 ASSERT(::GetObjectType(hDC)==OBJ_DC || ::GetObjectType(hDC)==OBJ_MEMDC); 68 ::SetBkMode(hDC, TRANSPARENT); 69 ::SetTextColor(hDC, RGB(GetBValue(m_dwTextColor), GetGValue(m_dwTextColor), GetRValue(m_dwTextColor))); 70 HFONT hOldFont = (HFONT)::SelectObject(hDC, m_pManager->GetFont(m_iFont)); 71 72 SIZE size; 73 ::GetTextExtentPoint32(hDC,m_sText.GetData(),m_sText.GetLength(),&size); 74 75 UINT uStyle = 0; 76 if(size.cx > rc.right - rc.left) 77 { 78 uStyle = DT_PATH_ELLIPSIS|DT_WORD_ELLIPSIS|DT_END_ELLIPSIS; 79 } 80 else 81 { 82 uStyle = DT_CENTER | DT_VCENTER | DT_SINGLELINE; 83 } 84 ::DrawText(hDC, m_sText, -1, &rc, uStyle | DT_NOPREFIX); 85 ::SelectObject(hDC, hOldFont); 86 } 87 } 88 else { 89 if( m_bShowHtml ) 90 CRenderEngine::DrawHtmlText(hDC, m_pManager, rc, m_sText, m_dwDisabledTextColor, 91 NULL, NULL, nLinks, DT_SINGLELINE | m_uTextStyle); 92 else { 93 ASSERT(::GetObjectType(hDC)==OBJ_DC || ::GetObjectType(hDC)==OBJ_MEMDC); 94 ::SetBkMode(hDC, TRANSPARENT); 95 ::SetTextColor(hDC, RGB(GetBValue(m_dwTextColor), GetGValue(m_dwTextColor), GetRValue(m_dwTextColor))); 96 HFONT hOldFont = (HFONT)::SelectObject(hDC, m_pManager->GetFont(m_iFont)); 97 98 SIZE size; 99 ::GetTextExtentPoint32(hDC,m_sText.GetData(),m_sText.GetLength(),&size); 100 101 UINT uStyle = 0; 102 if(size.cx > rc.right - rc.left) 103 { 104 uStyle = DT_PATH_ELLIPSIS|DT_WORD_ELLIPSIS|DT_END_ELLIPSIS; 105 } 106 else 107 { 108 uStyle = DT_CENTER | DT_VCENTER | DT_SINGLELINE; 109 } 110 ::DrawText(hDC, m_sText, -1, &rc, uStyle | DT_NOPREFIX); 111 ::SelectObject(hDC, hOldFont); 112 113 //CRenderEngine::DrawText(hDC, m_pManager, rc, m_sText, m_dwDisabledTextColor, 114 //m_iFont, /* DT_SINGLELINE | */m_uTextStyle); ///< @todo 115 } 116 117 } 118 } 119 else 120 { 121 Font nFont(hDC,m_pManager->GetFont(GetFont())); 122 123 Graphics nGraphics(hDC); 124 nGraphics.SetTextRenderingHint(m_TextRenderingHintAntiAlias); 125 126 StringFormat format; 127 format.SetAlignment((StringAlignment)m_hAlign); 128 format.SetLineAlignment((StringAlignment)m_vAlign); 129 130 RectF nRc((float)rc.left,(float)rc.top,(float)rc.right-rc.left,(float)rc.bottom-rc.top); 131 RectF nShadowRc = nRc; 132 nShadowRc.X += m_ShadowOffset.X; 133 nShadowRc.Y += m_ShadowOffset.Y; 134 135 int nGradientLength = GetGradientLength(); 136 137 if(nGradientLength == 0) 138 nGradientLength = (rc.bottom-rc.top); 139 140 LinearGradientBrush nLineGrBrushA(Point(GetGradientAngle(), 0),Point(0,nGradientLength),_MakeRGB(GetTransShadow(),GetTextShadowColorA()),_MakeRGB(GetTransShadow1(),GetTextShadowColorB() == -1?GetTextShadowColorA():GetTextShadowColorB())); 141 LinearGradientBrush nLineGrBrushB(Point(GetGradientAngle(), 0),Point(0,nGradientLength),_MakeRGB(GetTransText(),GetTextColor()),_MakeRGB(GetTransText1(),GetTextColor1() == -1?GetTextColor():GetTextColor1())); 142 143 if(GetEnabledStroke() && GetStrokeColor() > 0) 144 { 145 LinearGradientBrush nLineGrBrushStroke(Point(GetGradientAngle(),0),Point(0,rc.bottom-rc.top+2),_MakeRGB(GetTransStroke(),GetStrokeColor()),_MakeRGB(GetTransStroke(),GetStrokeColor())); 146 147 #ifdef _UNICODE 148 nRc.Offset(-1,0); 149 nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke); 150 nRc.Offset(2,0); 151 nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke); 152 nRc.Offset(-1,-1); 153 nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke); 154 nRc.Offset(0,2); 155 nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushStroke); 156 nRc.Offset(0,-1); 157 #else 158 USES_CONVERSION; 159 wstring mTextValue = A2W(m_TextValue.GetData()); 160 161 nRc.Offset(-1,0); 162 nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke); 163 nRc.Offset(2,0); 164 nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke); 165 nRc.Offset(-1,-1); 166 nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke); 167 nRc.Offset(0,2); 168 nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushStroke); 169 nRc.Offset(0,-1); 170 #endif 171 172 } 173 #ifdef _UNICODE 174 if(GetEnabledShadow() && (GetTextShadowColorA() > 0 || GetTextShadowColorB() > 0)) 175 nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nShadowRc,&format,&nLineGrBrushA); 176 177 nGraphics.DrawString(m_TextValue,m_TextValue.GetLength(),&nFont,nRc,&format,&nLineGrBrushB); 178 #else 179 USES_CONVERSION; 180 wstring mTextValue = A2W(m_TextValue.GetData()); 181 182 if(GetEnabledShadow() && (GetTextShadowColorA() > 0 || GetTextShadowColorB() > 0)) 183 nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nShadowRc,&format,&nLineGrBrushA); 184 185 nGraphics.DrawString(mTextValue.c_str(),mTextValue.length(),&nFont,nRc,&format,&nLineGrBrushB); 186 #endif 187 188 } 189 } 190
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:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <Window size="750,500" caption="0,0,0,60" sizebox="0,0,0,0" roundcorner="4,4"> 3 <!-- 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) --> 4 <Font name="微软雅黑" size="13"/> 5 <Font name="微软雅黑" size="16" /> 6 <Font name="微软雅黑" size="16" bold="true"/> 7 <Font name="微软雅黑" size="13" underline="true"/> 8 <Font name="宋体" size="13" /> 9 <Font name="微软雅黑" size="13" /> 10 11 <VerticalLayout bkcolor="#FFCCCCCC" bordersize="2" bordercolor="#FFE5DED8" > 12 <!-- 整个窗口的背景色 --> 13 <!-- 标题栏区 --> 14 <HorizontalLayout name="appbar" height="28" bkcolor="#FF13A8E0"> 15 <Control width="100"/> 16 <HorizontalLayout name="apptitle" > 17 <Label text="DuiLibTraverseFolderDemo http://www.cnblogs.com/chechen/" align="center" textcolor="#FFF5F6F7"/> 18 </HorizontalLayout> 19 <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'"/> 20 <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'"/> 21 <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'"/> 22 <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'"/> 23 </HorizontalLayout> 24 25 <HorizontalLayout bkcolor="#FFFFFFFF"> 26 27 <Label text="正在操作,请稍后..." align="center" font="2"/> 28 <LabelEx name="filepath" text="" float="true" pos="225,255,0,0" width="256" height="20" font="0" /> 29 30 </HorizontalLayout> 31 32 </VerticalLayout> 33 </Window>
Demo:Duilib实现类似电脑管家扫描目录效果