[MSCE C++]创建动态的textblock，使其内容和某一元素的参数相关联

Question

请教一个问题，在创建出textblock以后，在 textblock中输入的文本，是否有办法将输入的文本与某一元素的属性相关联，比如说画了一条10cm的直线，然后创建一个textblock，textblock的文本内容为直线长度10，当改变直线长度为15cm的时候，文本内容自动更新为15。这个功能和标注的关联标注有点类似。

Yongan.Fu · Accepted Answer

该功能MS自带，不需要我们做开发了。请学习一下TextField的使用。

Yongan.Fu · Answer

该编程较为复杂，需要用到EC的编程技术。目前C++可实现。如下示例演示了放置一个与弧元素的长度相关的TextField。 
 /*--------------------------------------------------------
| createText
+-------------------------------------------------------*/
TextFieldPtr createField(DgnModelR model)
 {
 // "DgnElementSchema" and "ArcElement" are found from ...\MicroStation\ECSchemas\Dgn\DgnElementSchema.01.00.ecschema.xml
 DgnFileP pDgnFile = ISessionMgr::GetActiveDgnFile();
 SchemaInfo schemaInfo(ECN::SchemaKey(L"DgnElementSchema", 1, 0), *pDgnFile);
	DgnECManagerR ecMan = DgnECManager::GetManager();
	ECN::ECSchemaPtr pSchema = ecMan.LocateSchemaInDgnFile(schemaInfo, ECN::SchemaMatchType::SCHEMAMATCHTYPE_LatestCompatible);
 if (pSchema == NULL)
 return NULL;
 ECN::ECClassCR ecClass = *pSchema->GetClassCP(L"ArcElement");

 ElementId elemId = 6173; // An arc element id
 ElementHandle elem(elemId, &model);
 if (!elem.IsValid())
 return NULL;
 DgnElementECInstancePtr pElemInst = ecMan.FindInstanceOnElement(elem, ecClass);

 return TextField::CreateForElement(*pElemInst, L"Length", nullptr, model);
 }

void createText(WCharCP unparsed)
 {
 DgnModelP pActiveModel = ISessionMgr::GetActiveDgnModelP();
 TextBlockPropertiesPtr pTBProp = TextBlockProperties::Create(*pActiveModel);
 pTBProp->SetIsViewIndependent(true);
 ParagraphPropertiesPtr pParaProp = ParagraphProperties::Create(*pActiveModel);
 DgnTextStylePtr pTextStyle = DgnTextStyle::GetActive();
 RunPropertiesPtr pRunProp = RunProperties::Create(*pTextStyle, *pActiveModel);

 TextBlockPtr pTextBlock = TextBlock::Create(*pTBProp, *pParaProp, *pRunProp, *pActiveModel);
 pTextBlock->AppendText(L"This is a ViewIndependent text");

 TextFieldPtr pField = createField(*pActiveModel);
 if (pField != NULL)
 pTextBlock->AppendField(*pField);

 EditElementHandle eeh;
 if (TEXTBLOCK_TO_ELEMENT_RESULT_Success ==
 TextHandlerBase::CreateElement(eeh, nullptr, *pTextBlock))
 {
 eeh.AddToModel();
 }
 }

杨 昊霖 · Answer

谢谢符老师

[MSCE C++]创建动态的textblock，使其内容和某一元素的参数相关联

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