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Immediate-Mode-UI.Nuklear
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   <div id="projectname">Nuklear
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   <div id="projectbrief">This is a minimal-state, immediate-mode graphical user interface toolkit written in ANSI C and licensed under public domain. It was designed as a simple embeddable user interface for application and does not have any dependencies, a default render backend or OS window/input handling but instead provides a highly modular, library-based approach, with simple input state for input and draw commands describing primitive shapes as output. So instead of providing a layered library that tries to abstract over a number of platform and render backends, it focuses only on the actual UI.</div>
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  <div class="headertitle"><div class="title">nuklear_page_element.c</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="preprocessor">#include &quot;<a class="code" href="nuklear_8h.html">nuklear.h</a>&quot;</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="preprocessor">#include &quot;nuklear_internal.h&quot;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment">/* ===============================================================</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> *</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> *                          PAGE ELEMENT</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> *</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> * ===============================================================*/</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span>NK_LIB <span class="keyword">struct </span><a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a>*</div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span>nk_create_page_element(<span class="keyword">struct</span> <a class="code hl_struct" href="structnk__context.html">nk_context</a> *ctx)</div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span>{</div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span>    <span class="keyword">struct </span><a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a> *elem;</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span>    <span class="keywordflow">if</span> (ctx-&gt;freelist) {</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span>        <span class="comment">/* unlink page element from free list */</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span>        elem = ctx-&gt;freelist;</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span>        ctx-&gt;freelist = elem-&gt;next;</div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span>    } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ctx-&gt;use_pool) {</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span>        <span class="comment">/* allocate page element from memory pool */</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span>        elem = nk_pool_alloc(&amp;ctx-&gt;pool);</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span>        NK_ASSERT(elem);</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span>        <span class="keywordflow">if</span> (!elem) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span>    } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span>        <span class="comment">/* allocate new page element from back of fixed size memory buffer */</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span>        NK_STORAGE <span class="keyword">const</span> nk_size size = <span class="keyword">sizeof</span>(<span class="keyword">struct </span><a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a>);</div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span>        NK_STORAGE <span class="keyword">const</span> nk_size align = NK_ALIGNOF(<span class="keyword">struct</span> <a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a>);</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>        elem = (<span class="keyword">struct </span><a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a>*)nk_buffer_alloc(&amp;ctx-&gt;memory, NK_BUFFER_BACK, size, align);</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span>        NK_ASSERT(elem);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>        <span class="keywordflow">if</span> (!elem) <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>    }</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>    nk_zero_struct(*elem);</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>    elem-&gt;next = 0;</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>    elem-&gt;prev = 0;</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span>    <span class="keywordflow">return</span> elem;</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>}</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>NK_LIB <span class="keywordtype">void</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>nk_link_page_element_into_freelist(<span class="keyword">struct</span> <a class="code hl_struct" href="structnk__context.html">nk_context</a> *ctx,</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>    <span class="keyword">struct</span> <a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a> *elem)</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>{</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>    <span class="comment">/* link table into freelist */</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>    <span class="keywordflow">if</span> (!ctx-&gt;freelist) {</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>        ctx-&gt;freelist = elem;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>    } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>        elem-&gt;next = ctx-&gt;freelist;</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>        ctx-&gt;freelist = elem;</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>    }</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>}</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>NK_LIB <span class="keywordtype">void</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>nk_free_page_element(<span class="keyword">struct</span> <a class="code hl_struct" href="structnk__context.html">nk_context</a> *ctx, <span class="keyword">struct</span> <a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a> *elem)</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>{</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>    <span class="comment">/* we have a pool so just add to free list */</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>    <span class="keywordflow">if</span> (ctx-&gt;use_pool) {</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>        nk_link_page_element_into_freelist(ctx, elem);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>        <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>    }</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>    <span class="comment">/* if possible remove last element from back of fixed memory buffer */</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>    {<span class="keywordtype">void</span> *elem_end = (<span class="keywordtype">void</span>*)(elem + 1);</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>    <span class="keywordtype">void</span> *buffer_end = (nk_byte*)ctx-&gt;memory.<a class="code hl_variable" href="structnk__buffer.html#a228b585debec1d328859fb52080ca3fd">memory</a>.ptr + ctx-&gt;memory.<a class="code hl_variable" href="structnk__buffer.html#a71e66eb6dad2c5827e363f2389ad4505">size</a>;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>    <span class="keywordflow">if</span> (elem_end == buffer_end)</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>        ctx-&gt;memory.<a class="code hl_variable" href="structnk__buffer.html#a71e66eb6dad2c5827e363f2389ad4505">size</a> -= <span class="keyword">sizeof</span>(<span class="keyword">struct </span><a class="code hl_struct" href="structnk__page__element.html">nk_page_element</a>);</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>    <span class="keywordflow">else</span> nk_link_page_element_into_freelist(ctx, elem);}</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>}</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span> </div>
<div class="ttc" id="anuklear_8h_html"><div class="ttname"><a href="nuklear_8h.html">nuklear.h</a></div><div class="ttdoc">main API and documentation file</div></div>
<div class="ttc" id="astructnk__buffer_html_a228b585debec1d328859fb52080ca3fd"><div class="ttname"><a href="structnk__buffer.html#a228b585debec1d328859fb52080ca3fd">nk_buffer::memory</a></div><div class="ttdeci">struct nk_memory memory</div><div class="ttdoc">!&lt; memory management type</div><div class="ttdef"><b>Definition</b> <a href="nuklear_8h_source.html#l04193">nuklear.h:4193</a></div></div>
<div class="ttc" id="astructnk__buffer_html_a71e66eb6dad2c5827e363f2389ad4505"><div class="ttname"><a href="structnk__buffer.html#a71e66eb6dad2c5827e363f2389ad4505">nk_buffer::size</a></div><div class="ttdeci">nk_size size</div><div class="ttdoc">!&lt; number of allocation calls</div><div class="ttdef"><b>Definition</b> <a href="nuklear_8h_source.html#l04198">nuklear.h:4198</a></div></div>
<div class="ttc" id="astructnk__context_html"><div class="ttname"><a href="structnk__context.html">nk_context</a></div><div class="ttdef"><b>Definition</b> <a href="nuklear_8h_source.html#l05705">nuklear.h:5705</a></div></div>
<div class="ttc" id="astructnk__page__element_html"><div class="ttname"><a href="structnk__page__element.html">nk_page_element</a></div><div class="ttdef"><b>Definition</b> <a href="nuklear_8h_source.html#l05682">nuklear.h:5682</a></div></div>
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