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Scintilla Usage Notes
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<img src="SciTEIco.png" border="3" height="64" width="64" alt="Scintilla icon" />
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<td>
<a href="index.html" style="color:white;text-decoration:none"><font size="5">Scintilla
Usage Notes</font></a>
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<h2>
Implementing Auto-Indent
</h2>
<p>
The key idea is to use the SCN_CHARADDED notification to add indentation after a newline.
</p>
<p>
The lParam on the notification is a pointer to a SCNotification structure whose ch member
specifies the character added. If a newline was added, the previous line can be retrieved and
the same indentation can be added to the new line.
</p>
<p>
Here is the relevant portion of code from SciTE: (SciTE.cxx SciTEWindow::CharAdded)
</p>
<span class='S5'>if</span><span class='S0'> </span> <span class='S10'>(</span><span
class='S11'>ch</span><span class='S0'> </span> <span class='S10'>==</span><span
class='S0'> </span> <span class='S7'>'\r'</span><span class='S0'> </span> <span
class='S10'>||</span><span class='S0'> </span> <span class='S11'>ch</span><span
class='S0'> </span> <span class='S10'>==</span><span class='S0'> </span> <span
class='S7'>'\n'</span><span class='S10'>)</span><span class='S0'> </span> <span
class='S10'>{</span><span class='S0'><br />
</span> <span class='S5'>char</span><span class='S0'> </span>
<span class='S11'>linebuf</span><span class='S10'>[</span><span class='S4'>1000</span><span
class='S10'>];</span><span class='S0'><br />
</span> <span class='S5'>int</span><span class='S0'> </span>
<span class='S11'>curLine</span><span class='S0'> </span> <span class='S10'>=</span><span
class='S0'> </span> <span class='S11'>GetCurrentLineNumber</span><span
class='S10'>();</span><span class='S0'><br />
</span> <span class='S5'>int</span><span class='S0'> </span>
<span class='S11'>lineLength</span><span class='S0'> </span> <span class='S10'>
=</span><span class='S0'> </span> <span class='S11'>SendEditor</span><span
class='S10'>(</span><span class='S11'>SCI_LINELENGTH</span><span class='S10'>,</span><span
class='S0'> </span> <span class='S11'>curLine</span><span class='S10'>);</span><span
class='S0'><br />
</span> <span class='S2'>
//Platform::DebugPrintf("[CR] %d len = %d\n", curLine, lineLength);</span><span
class='S0'><br />
</span> <span class='S5'>if</span><span class='S0'> </span> <span
class='S10'>(</span><span class='S11'>curLine</span><span class='S0'> </span> <span
class='S10'>></span><span class='S0'> </span> <span class='S4'>0</span><span
class='S0'> </span> <span class='S10'>&&</span><span class='S0'> </span>
<span class='S11'>lineLength</span><span class='S0'> </span> <span class='S10'>
<=</span><span class='S0'> </span> <span class='S4'>2</span><span
class='S10'>)</span><span class='S0'> </span> <span class='S10'>{</span><span
class='S0'><br />
</span> <span class='S5'>int</span><span class='S0'> </span>
<span class='S11'>prevLineLength</span><span class='S0'> </span> <span class='S10'>
=</span><span class='S0'> </span> <span class='S11'>SendEditor</span><span
class='S10'>(</span><span class='S11'>SCI_LINELENGTH</span><span class='S10'>,</span><span
class='S0'> </span> <span class='S11'>curLine</span><span class='S0'> </span> <span
class='S10'>-</span><span class='S0'> </span> <span class='S4'>1</span><span
class='S10'>);</span><span class='S0'><br />
</span> <span class='S5'>if</span><span class='S0'> </span> <span
class='S10'>(</span><span class='S11'>prevLineLength</span><span class='S0'> </span> <span
class='S10'><</span><span class='S0'> </span> <span class='S5'>sizeof</span><span
class='S10'>(</span><span class='S11'>linebuf</span><span class='S10'>))</span><span
class='S0'> </span> <span class='S10'>{</span><span class='S0'><br />
</span> <span class='S11'>WORD</span><span
class='S0'> </span> <span class='S11'>buflen</span><span class='S0'> </span> <span
class='S10'>=</span><span class='S0'> </span> <span class='S5'>sizeof</span><span
class='S10'>(</span><span class='S11'>linebuf</span><span class='S10'>);</span><span
class='S0'><br />
</span> <span class='S11'>memcpy</span><span
class='S10'>(</span><span class='S11'>linebuf</span><span class='S10'>,</span><span
class='S0'> </span> <span class='S10'>&</span><span class='S11'>buflen</span><span
class='S10'>,</span><span class='S0'> </span> <span class='S5'>sizeof</span><span
class='S10'>(</span><span class='S11'>buflen</span><span class='S10'>));</span><span
class='S0'><br />
</span> <span class='S11'>
SendEditor</span><span class='S10'>(</span><span class='S11'>EM_GETLINE</span><span
class='S10'>,</span><span class='S0'> </span> <span class='S11'>curLine</span><span
class='S0'> </span> <span class='S10'>-</span><span class='S0'> </span> <span
class='S4'>1</span><span class='S10'>,</span><span class='S0'><br />
</span>
<span class='S5'>reinterpret_cast</span><span class='S10'><</span><span
class='S11'>LPARAM</span><span class='S10'>>(</span><span class='S5'>static_cast</span><span
class='S10'><</span><span class='S5'>char</span><span class='S0'> </span> <span
class='S10'>*>(</span><span class='S11'>linebuf</span><span class='S10'>)));</span><span
class='S0'><br />
</span> <span class='S11'>linebuf</span><span
class='S10'>[</span><span class='S11'>prevLineLength</span><span class='S10'>]</span><span
class='S0'> </span> <span class='S10'>=</span><span class='S0'> </span> <span
class='S7'>'\0'</span><span class='S10'>;</span><span class='S0'><br />
</span> <span class='S5'>for</span><span
class='S0'> </span> <span class='S10'>(</span><span class='S5'>int</span><span
class='S0'> </span> <span class='S11'>pos</span><span class='S0'> </span> <span
class='S10'>=</span><span class='S0'> </span> <span class='S4'>0</span><span
class='S10'>;</span><span class='S0'> </span> <span class='S11'>linebuf</span><span
class='S10'>[</span><span class='S11'>pos</span><span class='S10'>];</span><span
class='S0'> </span> <span class='S11'>pos</span><span class='S10'>++)</span><span
class='S0'> </span> <span class='S10'>{</span><span class='S0'><br />
</span> <span
class='S5'>if</span><span class='S0'> </span> <span class='S10'>(</span><span
class='S11'>linebuf</span><span class='S10'>[</span><span class='S11'>pos</span><span
class='S10'>]</span><span class='S0'> </span> <span class='S10'>!=</span><span
class='S0'> </span> <span class='S7'>' '</span><span class='S0'> </span> <span
class='S10'>&&</span><span class='S0'> </span> <span class='S11'>
linebuf</span><span class='S10'>[</span><span class='S11'>pos</span><span
class='S10'>]</span><span class='S0'> </span> <span class='S10'>!=</span><span
class='S0'> </span> <span class='S7'>'\t'</span><span class='S10'>)</span><span
class='S0'><br />
</span>
<span class='S11'>linebuf</span><span class='S10'>[</span><span class='S11'>pos</span><span
class='S10'>]</span><span class='S0'> </span> <span class='S10'>=</span><span
class='S0'> </span> <span class='S7'>'\0'</span><span class='S10'>;</span><span
class='S0'><br />
</span> <span class='S10'>}</span><span
class='S0'><br />
</span> <span class='S11'>
SendEditor</span><span class='S10'>(</span><span class='S11'>EM_REPLACESEL</span><span
class='S10'>,</span><span class='S0'> </span> <span class='S4'>0</span><span
class='S10'>,</span><span class='S0'> </span> <span class='S5'>
reinterpret_cast</span><span class='S10'><</span><span class='S11'>LPARAM</span><span
class='S10'>>(</span><span class='S5'>static_cast</span><span class='S10'><</span><span
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