DuiDesigner控件Label无法设置文本对齐属性的BUG解决方案

1、修复duilib资源编辑器的bug:label、按钮控件无法设置除了center之外的文本对齐方式
2、修复duilb文本显示对齐方式的逻辑错误代码,DT_LEFT和DT_RIGHT必须配合属性DT_SINGLELINE使用
3、另外添加了左对齐和右对齐文本显示属性默认纵向居中的逻辑,便于编排控件

首先解决文字绘制不支持左对齐的BUG,因为文字属于绘制逻辑实现的,所以我们先从视图的绘制开始找起。
void CUIDesignerView::OnDraw(CDC* pDrawDC)
找到这一行:
m_LayoutManager.Draw(&hCloneDC);
这个就是布局的绘制逻辑:
void CLayoutManager::Draw(CDC* pDC) { CSize szForm = GetForm()->GetInitSize(); CRect rcPaint(0, 0, szForm.cx, szForm.cy); CControlUI* pForm = m_Manager.GetRoot(); pForm->DoPaint(pDC->GetSafeHdc(), rcPaint); CContainerUI* pContainer = static_cast<CContainerUI*>(pForm->GetInterface(_T("Container"))); ASSERT(pContainer); DrawAuxBorder(pDC, pContainer->GetItemAt(0)); DrawGrid(pDC, rcPaint); }
再继续看:
void CControlUI::DoPaint(HDC hDC, const RECT& rcPaint) { if( !::IntersectRect(&m_rcPaint, &rcPaint, &m_rcItem) ) return; // 绘制循序:背景颜色->背景图->状态图->文本->边框if( m_cxyBorderRound.cx > 0 || m_cxyBorderRound.cy > 0 ) { CRenderClip roundClip; CRenderClip::GenerateRoundClip(hDC, m_rcPaint, m_rcItem, m_cxyBorderRound.cx, m_cxyBorderRound.cy, roundClip); PaintBkColor(hDC); PaintBkImage(hDC); PaintStatusImage(hDC); PaintText(hDC); PaintBorder(hDC); } else { PaintBkColor(hDC); PaintBkImage(hDC); PaintStatusImage(hDC); PaintText(hDC); PaintBorder(hDC); } }
再跟进函数PaintText:
void CControlUI::PaintText(HDC hDC)
{
    return;
}
是一个空函数,一定是基类的虚函数,具体绘制实现在派生类对应的函数中,这里是为了解决按钮和label控件的文字绘制对齐问题,所以这里直接查看CLabelUI(CButtonUI继承自CLabelUI)的PaintText函数:
void CLabelUI::PaintText(HDC hDC) { if( m_dwTextColor == 0 ) m_dwTextColor = m_pManager->GetDefaultFontColor(); if( m_dwDisabledTextColor == 0 ) 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 = 0; if( IsEnabled() ) { if( m_bShowHtml ) CRenderEngine::DrawHtmlText(hDC, m_pManager, rc, m_sText, m_dwTextColor, \ NULL, NULL, nLinks, DT_SINGLELINE | m_uTextStyle); else CRenderEngine::DrawText(hDC, m_pManager, rc, m_sText, m_dwTextColor, \ m_iFont, DT_SINGLELINE |m_uTextStyle); } else { if( m_bShowHtml ) CRenderEngine::DrawHtmlText(hDC, m_pManager, rc, m_sText, m_dwDisabledTextColor, \ NULL, NULL, nLinks, DT_SINGLELINE | m_uTextStyle); else CRenderEngine::DrawText(hDC, m_pManager, rc, m_sText, m_dwDisabledTextColor, \ m_iFont, DT_SINGLELINE |m_uTextStyle); } } else { …… } }       
CRenderEngine::DrawText最后是调用API函数 DrawText绘制的文本:
void CRenderEngine::DrawText(HDC hDC, CPaintManagerUI* pManager, RECT& rc, LPCTSTR pstrText, DWORD dwTextColor, int iFont, UINT uStyle) { ASSERT(::GetObjectType(hDC)==OBJ_DC || ::GetObjectType(hDC)==OBJ_MEMDC); if( pstrText == NULL || pManager == NULL ) return; ::SetBkMode(hDC, TRANSPARENT); ::SetTextColor(hDC, RGB(GetBValue(dwTextColor), GetGValue(dwTextColor), GetRValue(dwTextColor))); HFONT hOldFont = (HFONT)::SelectObject(hDC, pManager->GetFont(iFont)); ::DrawText(hDC, pstrText, -1, &rc, uStyle | DT_NOPREFIX); ::SelectObject(hDC, hOldFont); }
文字对齐属性主要取决于 m_uTextStyle,在CLabelUI的源码中搜索m_uTextStyle的引用,找到SetAttribute函数:
void CLabelUI::SetAttribute(LPCTSTR pstrName, LPCTSTR pstrValue) { if( _tcscmp(pstrName, _T("align")) == 0 ) { if( _tcsstr(pstrValue, _T("left")) != NULL ) { m_uTextStyle &= ~(DT_CENTER | DT_RIGHT | DT_VCENTER | DT_SINGLELINE); m_uTextStyle |= DT_LEFT; }if( _tcsstr(pstrValue, _T("center")) != NULL ) { m_uTextStyle &= ~(DT_LEFT | DT_RIGHT ); m_uTextStyle |= DT_CENTER; } if( _tcsstr(pstrValue, _T("right")) != NULL ) { m_uTextStyle &= ~(DT_LEFT | DT_CENTER | DT_VCENTER | DT_SINGLELINE); m_uTextStyle |= DT_RIGHT; }if( _tcsstr(pstrValue, _T("top")) != NULL ) { m_uTextStyle &= ~(DT_BOTTOM | DT_VCENTER | DT_VCENTER); m_uTextStyle |= (DT_TOP | DT_SINGLELINE); } if( _tcsstr(pstrValue, _T("vcenter")) != NULL ) { m_uTextStyle &= ~(DT_TOP | DT_BOTTOM ); m_uTextStyle |= (DT_CENTER | DT_VCENTER | DT_SINGLELINE); } if( _tcsstr(pstrValue, _T("bottom")) != NULL ) { m_uTextStyle &= ~(DT_TOP | DT_VCENTER | DT_VCENTER); m_uTextStyle |= (DT_BOTTOM | DT_SINGLELINE); } }



现在再来解决问题1,属性的显示是在CUIProperties::ShowLabelProperty中实现的:
void CUIProperties::ShowLabelProperty(CControlUI* pControl) { ShowControlProperty(pControl); ASSERT(pControl); CLabelUI* pLabel=static_cast<CLabelUI*>(pControl->GetInterface(_T("Label"))); ASSERT(pLabel); CMFCPropertyGridProperty* pPropLabel=m_wndPropList.FindItemByData(classLabel,FALSE); ASSERT(pPropLabel); //align
 UINT uStyle=pLabel->GetTextStyle(); CString strStyle; if(uStyle&DT_CENTER) strStyle=_T("Center"); elseif(uStyle&DT_LEFT)  //这里有BUG strStyle=_T("Left"); elseif(uStyle&DT_RIGHT) strStyle=_T("Right"); elseif(uStyle&DT_TOP) strStyle=_T("Top"); elseif(uStyle&DT_BOTTOM) strStyle=_T("Bottom");
注意看处理左对齐的代码逻辑,由于DT_LEFT被定义为0x00000000,因此uStyle&DT_LEFT恒不为真,这也就是为什么设置不了文字左对齐的原因。修改的逻辑如下:
void CUIProperties::ShowLabelProperty(CControlUI* pControl) { ShowControlProperty(pControl); ASSERT(pControl); CLabelUI* pLabel=static_cast<CLabelUI*>(pControl->GetInterface(_T("Label"))); ASSERT(pLabel); CMFCPropertyGridProperty* pPropLabel=m_wndPropList.FindItemByData(classLabel,FALSE); ASSERT(pPropLabel); //align
 UINT uStyle=pLabel->GetTextStyle(); CString strStyle; if(uStyle&DT_CENTER) strStyle=_T("Center"); else if(uStyle==0) strStyle=_T("Left"); elseif(uStyle&DT_RIGHT) strStyle=_T("Right"); elseif(uStyle&DT_TOP) strStyle=_T("Top"); elseif(uStyle&DT_BOTTOM) strStyle=_T("Bottom");
至此,在资源编辑器中便可以设置文本对齐属性了,但是修改完成后保存发现属性并未保存成功,继续排查。
布局文件最终保存为xml文件,因此肯定会使用到xml的操作,而工程中使用了tinyxml,因此通过搜索tinyxml文档类的引用最终找到保存布局文件的函数:CLayoutManager::SaveSkinFile,它会在最后调用:
 SaveProperties(pForm->GetItemAt(0), pNode->ToElement());
我们看CLayoutManager::SaveProperties
void CLayoutManager::SaveProperties(CControlUI* pControl, TiXmlElement* pParentNode
……
  case classLabel:
  case classText:
  SaveLabelProperty(pControl, pNode);
  break;
……
继续查看CLayoutManager::SaveLabelProperty,向下找到代码:
if(uTextStyle & DT_LEFT)  tstrAlgin = _T("left");
仍然是犯了相同的错误,代码应该修改为:
if( uTextStyle==0 )  tstrAlgin = _T("left");

完成以上代码修改后,重新编译并运行DuiDesigner即可。

新的问题:
我们回到上面的 CLabelUI::SetAttribute看,发现里面有一个 vcenter属性, 属性的设置是又外部属性编辑器中发生改变时调用的,但是编辑器中并没有提供 vcenter属性:

而且保存的时候有一个 wrap属性:
    if(uTextStyle & DT_WORDBREAK)
        tstrAlgin += _T(" wrap");

产生原因:
duilib核心库作者一直在维护,但是duidesigner后面没有再维护了,甚至被作者从开源库中删除了,甚至悲剧。所以满足不了需求了,后面修改一下。
先梳理一下实现效果:
//left和top作为默认属性,冲突属性:DT_RIGHT存在时不能有left,DT_BOTTOM存在时不能有top,DT_WORDBREAK存在时不能有left和top
//DT_CENTER存在时不能有left和right,DT_VCENTER存在时不能有top和bottom
DT_WORDBREAK属性也考虑一下,继续设计成wrap属性,并增加一个none属性,表述没有任何风格。

兼容性考虑:
新的设计要兼容老的选项,而代码中处理属性的时候是使用 _tcsstr来判断一个属性例如left或top字符串是否存在,存在则添加上对应的风格,因此新的属性应该至少满足让旧版查询到字符串即可。

修改步骤:
1、选择属性时设置对应的风格: CLabelUI::SetAttribute DT_LEFT、 DT_TOP值为0,处理位操作比较麻烦,穷举方式处理。
2、编辑器初始化时(CUIProperties::InitPropList)Align的选项修改为:LeftVCenter,RightVCenter,Center,TopCenter,BottomCenter,LeftTop,LeftBottom,RightTop,RightBottom,Wrap,None,默认使用LeftVCenter。这种设计可以让老版代码识别。
3、属性保存的时候 CLayoutManager::SaveLabelProperty, CLayoutManager::SaveListHeaderItemProperty
4、点击控件时,显示属性 CUIProperties::ShowLabelProperty。


编辑器初始化时:
    //Label
#pragma region Label pPropUI=new CMFCPropertyGridProperty(_T("Label"),classLabel); //align
    pProp=new CMFCPropertyGridProperty(_T("Align"),_T("Center"),_T("指示文本的对齐方式"),tagAlign); pProp->AddOption(_T("Center")); pProp->AddOption(_T("Left")); pProp->AddOption(_T("Right")); pProp->AddOption(_T("Top")); pProp->AddOption(_T("Bottom")); pProp->AllowEdit(TRUE); pPropUI->AddSubItem(pProp);
修改为:
    //align
    pProp=new CMFCPropertyGridProperty(_T("Align"),_T("LeftVCenter"),_T("指示文本的对齐方式"),tagAlign); pProp->AddOption(_T("LeftVCenter")); pProp->AddOption(_T("RightVCenter")); pProp->AddOption(_T("Center")); pProp->AddOption(_T("TopCenter")); pProp->AddOption(_T("BottomCenter")); pProp->AddOption(_T("LeftTop")); pProp->AddOption(_T("LeftBottom")); pProp->AddOption(_T("RightTop")); pProp->AddOption(_T("RightBottom")); pProp->AddOption(_T("Wrap")); pProp->AddOption(_T("None")); pProp->AllowEdit(FALSE); pPropUI->AddSubItem(pProp);
DuiDesigner控件Label无法设置文本对齐属性的BUG解决方案_第1张图片
属性保存时:
CLayoutManager::SaveLabelProperty:
  std::wstring tstrAlgin; UINT uTextStyle = pLabelUI->GetTextStyle(); uTextStyle &= ~(DT_SINGLELINE); if( uTextStyle == (DT_LEFT | DT_VCENTER) ) { tstrAlgin = _T("leftvcenter"); }else if ( uTextStyle == (DT_RIGHT | DT_VCENTER) ) { tstrAlgin = _T("rightvcenter"); }else if ( uTextStyle == (DT_CENTER | DT_VCENTER) ) { tstrAlgin = _T("center"); }else if ( uTextStyle == (DT_CENTER | DT_TOP) ) { tstrAlgin = _T("topcenter"); }else if ( uTextStyle == (DT_CENTER | DT_BOTTOM) ) { tstrAlgin = _T("bottomcenter"); }else if ( uTextStyle == (DT_LEFT | DT_TOP) ) { tstrAlgin = _T("lefttop"); }else if ( uTextStyle == (DT_LEFT | DT_BOTTOM) ) { tstrAlgin = _T("leftbottom"); }else if ( uTextStyle == (DT_RIGHT | DT_TOP) ) { tstrAlgin = _T("righttop"); }else if ( uTextStyle == (DT_RIGHT | DT_BOTTOM) ) { tstrAlgin = _T("rightbottom"); }else if ( uTextStyle == DT_WORDBREAK ) { tstrAlgin = _T("wrap"); }else{ tstrAlgin = _T(""); }
还有一处用到了Label: CLayoutManager::SaveListHeaderItemProperty
std::wstring tstrAlgin; UINT uTextStyle = pListHeaderItemUI->GetTextStyle(); uTextStyle &= ~(DT_SINGLELINE); if( uTextStyle == (DT_LEFT | DT_VCENTER) ) { tstrAlgin = _T("leftvcenter"); }else if ( uTextStyle == (DT_RIGHT | DT_VCENTER) ) { tstrAlgin = _T("rightvcenter"); }else if ( uTextStyle == (DT_CENTER | DT_VCENTER) ) { tstrAlgin = _T("center"); }else if ( uTextStyle == (DT_CENTER | DT_TOP) ) { tstrAlgin = _T("topcenter"); }else if ( uTextStyle == (DT_CENTER | DT_BOTTOM) ) { tstrAlgin = _T("bottomcenter"); }else if ( uTextStyle == (DT_LEFT | DT_TOP) ) { tstrAlgin = _T("lefttop"); }else if ( uTextStyle == (DT_LEFT | DT_BOTTOM) ) { tstrAlgin = _T("leftbottom"); }else if ( uTextStyle == (DT_RIGHT | DT_TOP) ) { tstrAlgin = _T("righttop"); }else if ( uTextStyle == (DT_RIGHT | DT_BOTTOM) ) { tstrAlgin = _T("rightbottom"); }else if ( uTextStyle == DT_WORDBREAK ) { tstrAlgin = _T("wrap"); }else{ tstrAlgin = _T(""); }

编辑器中显示控件属性:
CUIProperties::ShowLabelProperty:
CString strStyle; UINT uTextStyle=pLabel->GetTextStyle(); uTextStyle &= ~(DT_SINGLELINE); if( uTextStyle == (DT_LEFT | DT_VCENTER) ) { strStyle = _T("LeftVCenter"); }else if ( uTextStyle == (DT_RIGHT | DT_VCENTER) ) { strStyle = _T("RightVCenter"); }else if ( uTextStyle == (DT_CENTER | DT_VCENTER) ) { strStyle = _T("Center"); }else if ( uTextStyle == (DT_CENTER | DT_TOP) ) { strStyle = _T("TopCenter"); }else if ( uTextStyle == (DT_CENTER | DT_BOTTOM) ) { strStyle = _T("BottomCenter"); }else if ( uTextStyle == (DT_LEFT | DT_TOP) ) { strStyle = _T("LeftTop"); }else if ( uTextStyle == (DT_LEFT | DT_BOTTOM) ) { strStyle = _T("LeftBottom"); }else if ( uTextStyle == (DT_RIGHT | DT_TOP) ) { strStyle = _T("RightYop"); }else if ( uTextStyle == (DT_RIGHT | DT_BOTTOM) ) { strStyle = _T("RightBottom"); }else if ( uTextStyle == DT_WORDBREAK ) { strStyle = _T("Wrap"); }else{ strStyle = _T("None"); }

设置控件属性:
CLabelUI::SetAttribute:
if( _tcscmp(pstrValue, _T("leftvcenter")) == 0 ) { m_uTextStyle = DT_LEFT | DT_VCENTER | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("rightvcenter")) == 0 ) { m_uTextStyle = DT_RIGHT | DT_VCENTER | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("center")) == 0 ) { m_uTextStyle = DT_CENTER | DT_VCENTER | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("topcenter")) == 0 ) { m_uTextStyle = DT_CENTER | DT_TOP | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("bottomcenter")) == 0 ) { m_uTextStyle = DT_CENTER | DT_BOTTOM | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("lefttop")) == 0 ) { m_uTextStyle = DT_LEFT | DT_TOP | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("leftbottom")) == 0 ) { m_uTextStyle = DT_LEFT | DT_BOTTOM | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("righttop")) == 0 ) { m_uTextStyle = DT_RIGHT | DT_TOP | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("rightbottom")) == 0 ) { m_uTextStyle = DT_RIGHT | DT_BOTTOM | DT_SINGLELINE; }else if ( _tcscmp(pstrValue, _T("wrap")) == 0 ) { m_uTextStyle = DT_WORDBREAK; }else if ( _tcscmp(pstrValue, _T("none")) == 0 ) { m_uTextStyle = 0x10000000; }else{ m_uTextStyle = 0; }


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