近来有好多朋友问如何在RichEdit中实现上标下标,查了好多资料都没找到。今天无意间在Delphi区闲逛，看到一份实现上下标的文章，于是整理成CB语言的贴出来。
以下代码已测试通过。在Form中放置一个RichEdit，两个Button，完整代码如下：
//---------------------------------------------------------------------------
typedef enum
{
CFM_Superscript, // 上标
CFM_Subscript, // 下标
CFM_Normal // 普通文本
}TCharacterFormat;
void MySetCharFormat(TRichEdit *RichEdit, TCharacterFormat CharacterFormat)
{
// ccrun(老妖)根据Delphi超级猛料中的资料修改而成
// 欢迎光临 C++ Builder 研究 http://www.ccrun.com
TCharFormat Format;
Format.cbSize = sizeof(Format);
Format.dwMask = CFM_OFFSET;
// Character offset, in twips, from the baseline.
// If the value of this member is positive,
// the character is a superscript;
// if it is negative, the character is a subscript.
switch(CharacterFormat)
{
case CFM_Superscript:
Format.yOffset = 60;
break;
case CFM_Subscript:
Format.yOffset = -60;
break;
case CFM_Normal:
Format.yOffset = 0;
break;
default:
break;
}
// The EM_SETCHARFORMAT message sets character formatting in a rich edit control.
// SCF_SELECTION: Applies the formatting to the current selection
RichEdit->Perform(EM_SETCHARFORMAT, SCF_SELECTION, Longint(&Format));
}
//---------------------------------------------------------------------------
// 先选中Richedit中的部分文本，然后点击此按钮，选中文本将变成上标
void __fastcall TForm1::Button1Click(TObject *Sender)
{
// 上标
MySetCharFormat(RichEdit1, CFM_Superscript);
}
//---------------------------------------------------------------------------
// 先选中Richedit中的部分文本，然后点击此按钮，选中文本将变成下标
void __fastcall TForm1::Button2Click(TObject *Sender)
{
// 下标
MySetCharFormat(RichEdit1, CFM_Subscript);
}
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