BCB中获得RichEdit 默认行间距

首先，这些功能支持RichEdit2.0 以上功能；

其次，用常规的方法是无法获得LineSpace 的；

• 你使用 EM_GETPARAFORMAT也得不到，你会发现dyLineSpacing 的值永远是0
• 你先EM_SETPARAFORMAT ，指定 bLineSpacingRule = 4，再用GETPARAFORMAT 去取dyLineSpacing 同样是0

也许RichEdit的作者有办法。

https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/f67f6416-eab3-4aee-bfcc-85b9f26fde39/rich-edit-control-line-height

下面是richedit 作者的blog

https://blogs.msdn.microsoft.com/murrays/2010/01/12/richedit-versions-1-0-through-3-0/#comment-12105

下面是我的解决办法。

我发现了一个规律，当用EM_SETPARAFORMAT ，改变行间距的时候。整体文本区域的高度也改变了。

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" 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" alt="" />

代码如下

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;

static int LineSpace = ;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    RichEdit1->SelectAll();
    PARAFORMAT2 Para;
    Para.cbSize = sizeof(Para);
    Para.dwMask = PFM_LINESPACING;
    Para.bLineSpacingRule = ;
    Para.dyLineSpacing = LineSpace;
    SendMessage(RichEdit1->Handle, EM_SETPARAFORMAT, , LPARAM(&Para));
}
//---------------------------------------------------------------------------

由此我们得到启发，如果我们1开始，制定LinSpace 是1，然后逐渐累加。

当，文本区域的高度和默认文本高度相同时，是不是就得到，LineSpace 对应的值了呢？

问题1，如何得到文本区域的高度？  看我的另一个博客 http://www.cnblogs.com/songr/p/5485187.html

问题2，计算，这个超级简单；

下面是实现代码

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;

static int LineSpace = ;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    RichEdit1->SelectAll();
    PARAFORMAT2 Para;
    Para.cbSize = sizeof(Para);
    Para.dwMask = PFM_LINESPACING;
    Para.bLineSpacingRule = ;
    Para.dyLineSpacing = LineSpace;
    SendMessage(RichEdit1->Handle, EM_SETPARAFORMAT, , LPARAM(&Para));
}
//---------------------------------------------------------------------------

int TForm1::getTextAreaHeight()
{
    RichEdit1->Text = RichEdit1->Text.TrimRight();
    int LogX,LogY;
    HDC richdc = GetDC(RichEdit1->Handle);
    LogX = GetDeviceCaps(richdc, LOGPIXELSX);
    LogY = GetDeviceCaps(richdc, LOGPIXELSY);

    FORMATRANGE formatrange = {};
    formatrange.hdc = richdc;
    formatrange.hdcTarget = richdc;
    formatrange.rc.left = ;
    formatrange.rc.top  = ;
    formatrange.rc.right = RichEdit1->ClientWidth *  / LogX;
    formatrange.rc.bottom= Screen->Height*  / LogY;
    formatrange.rcPage = formatrange.rc;
    formatrange.chrg.cpMin = ;
    formatrange.chrg.cpMax = -;
    RichEdit1->Perform(EM_FORMATRANGE,,(long)&formatrange);
    int totalHeight = formatrange.rc.bottom * LogY / ;
    RichEdit1->Perform(EM_FORMATRANGE,,NULL);
    ReleaseDC(RichEdit1->Handle,richdc);
    return totalHeight;
}

void __fastcall TForm1::Button2Click(TObject *Sender)
{
//首先将RichEdit 设置成默认Single spacing
    RichEdit1->SelectAll();
    PARAFORMAT2 Para;
    Para.cbSize = sizeof(Para);
    Para.dwMask = PFM_LINESPACING;
    Para.bLineSpacingRule = ;
    SendMessage(RichEdit1->Handle, EM_SETPARAFORMAT, , LPARAM(&Para));
//得到默认情况下的文本区域高度
    int defTextAreaHeight = getTextAreaHeight();
    int i = ;
    do
    {
//不停的改变行间距，直到文本区域高度和默认情况下相同
        i++;
        PARAFORMAT2 Para;
        Para.cbSize = sizeof(Para);
        Para.dwMask = PFM_LINESPACING;
        Para.bLineSpacingRule = ;
        Para.dyLineSpacing = i;
        SendMessage(RichEdit1->Handle, EM_SETPARAFORMAT, , LPARAM(&Para));
    }
    while (defTextAreaHeight != getTextAreaHeight());

    ShowMessage(IntToStr(i));
}
//---------------------------------------------------------------------------

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" alt="" />

说明，当累加到 278 的时候，文本区域的高度相同了。也就是说，278 是，默认行高的基准线。

有了这个基准线之后。我就可以用这个278 作为，我们计算行高的基础值了。（例如，减少行高时，不能小于这个值。）