标签:formatrange Richedit TForm1 BCB LogY RichEdit1 richdc rc 总行
BCB 中测量Richedit 的文本总行高
1,需要使用EM_FORMATRANGE 消息
2,实现的代码如下:
//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
RichEdit1->Text = RichEdit1->Text.TrimRight();
int LogX,LogY;
HDC richdc = GetDC(RichEdit1->Handle);
LogX = GetDeviceCaps(richdc, LOGPIXELSX);
LogY = GetDeviceCaps(richdc, LOGPIXELSY);
FORMATRANGE formatrange = {0};
formatrange.hdc = richdc;
formatrange.hdcTarget = richdc;
formatrange.rc.left = 0;
formatrange.rc.top = 0;
formatrange.rc.right = RichEdit1->ClientWidth * 1440 / LogX;
formatrange.rc.bottom= Screen->Height* 1440 / LogY;
formatrange.rcPage = formatrange.rc;
formatrange.chrg.cpMin = 0;
formatrange.chrg.cpMax = -1;
RichEdit1->Perform(EM_FORMATRANGE,0,(long)&formatrange);
int totalHeight = formatrange.rc.bottom * LogY / 1440;
ShowMessage("文本总高度"+IntToStr(formatrange.rc.bottom * LogY / 1440));
RichEdit1->Perform(EM_FORMATRANGE,0,NULL);//free the cache
if (totalHeight > (RichEdit1->ClientHeight+3))
{
ShowMessage("文字超出范围!");
}
ReleaseDC(RichEdit1->Handle,richdc);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button2Click(TObject *Sender)
{
RichEdit1->Font->Size++;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Button3Click(TObject *Sender)
{
RichEdit1->Font->Size--;
}
//---------------------------------------------------------------------------
标签:formatrange,Richedit,TForm1,BCB,LogY,RichEdit1,richdc,rc,总行 来源: https://blog.csdn.net/huang714/article/details/88785936
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