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<div class="title">Problems with FLTK </div> </div>
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<div class="textblock"><h2><a class="el" href="classdw_1_1fltk_1_1FltkViewport.html">dw::fltk::FltkViewport</a></h2>
<p>Current problems:</p>
<ul>
<li>
<p class="startli">How should <a class="el" href="classdw_1_1fltk_1_1FltkViewBase.html#a5e068f530f1c8ca8307d631c0e3c27a8" title="Cancel a draw queue request. ">dw::fltk::FltkViewport::cancelQueueDraw</a> be implemented?</p>
<p class="endli"></p>
</li>
<li>
<p class="startli">If the value of a scrollbar is changed by the program, not the user, the callback seems not to be called. Can this be assured?</p>
<p class="endli"></p>
</li>
<li>
<p class="startli">The same for dw::fltk::FltkViewport::layout?</p>
<p class="endli"></p>
</li>
<li>
<p class="startli">Also, the problems with the widgets seems to work. Also sure?</p>
<p class="endli"></p>
</li>
<li>
<p class="startli">When drawing, clipping of 32 bit values is not working properly.</p>
<p class="endli"></p>
</li>
<li>
The item group within a selection widget (menu) should not be selectable. </li>
</ul>
<h2><a class="el" href="classdw_1_1fltk_1_1FltkPlatform.html">dw::fltk::FltkPlatform</a></h2>
<ul>
<li>
<p class="startli">There is the problem, that fltk::font always returns a font, the required one, or a replacements. The latter is not wanted in all cases, e.g. when several fonts are tested. Perhaps, this could be solved by searching in the font list. <em>[This was true of fltk2. What is the state of font handling now with fltk-1.3?]</em></p>
<p class="endli"></p>
</li>
<li>
Distinction between italics and oblique would be nice (<a class="el" href="classdw_1_1fltk_1_1FltkFont.html#a038a5e239cabe7cbbe1d9cd6a1579fe3">dw::fltk::FltkFont::FltkFont</a>). </li>
</ul>
<h2><a class="el" href="classdw_1_1fltk_1_1ui_1_1FltkCheckButtonResource.html">dw::fltk::ui::FltkCheckButtonResource</a></h2>
<p>Groups of Fl_Radio_Button must be added to one Fl_Group, which is not possible in this context. There are two alternatives:</p>
<ol>
<li>
there is a more flexible way to group radio buttons, or </li>
<li>
radio buttons are not grouped, instead, grouping (especially unchecking other buttons) is done by the application. </li>
</ol>
<p>(This is mostly solved.)</p>
<h2><a class="el" href="classdw_1_1fltk_1_1FltkImgbuf.html">dw::fltk::FltkImgbuf</a></h2>
<p>Alpha transparency should be best abstracted by FLTK itself. If not, perhaps different implementations for different window systems could be used. Then, it is for X necessary to use GCs with clipping masks.</p>
<h2><a class="el" href="classdw_1_1fltk_1_1ui_1_1ComplexButton.html">dw::fltk::ui::ComplexButton</a></h2>
<p>Unfortunately, FLTK does not provide a button with Fl_Group as parent, so that children may be added to the button. <a class="el" href="classdw_1_1fltk_1_1ui_1_1ComplexButton.html">dw::fltk::ui::ComplexButton</a> does exactly this, and is, in an ugly way, a modified copy of the FLTK button.</p>
<p>It would be nice, if this is merged with the standard FLTK button. Furthermore, setting the type is strange.</p>
<p>If the files do not compile, it may be useful to create a new one from the FLTK source:</p>
<ol>
<li>
<p class="startli">Copy Fl_Button.H from FLTK to <a class="el" href="fltkcomplexbutton_8hh.html">dw/fltkcomplexbutton.hh</a> and src/Button.cxx to <a class="el" href="fltkcomplexbutton_8cc.html">dw/fltkcomplexbutton.cc</a>.</p>
<p class="endli"></p>
</li>
<li>
<p class="startli">In both files, rename "Button" to "ComplexButton". Automatic replacing should work.</p>
<p class="endli"></p>
</li>
<li>
Apply the changes below. </li>
</ol>
<p>The following changes should be applied manually.</p>
<h3>Changes in <a class="el" href="fltkcomplexbutton_8hh.html">fltkcomplexbutton.hh</a></h3>
<p>First of all, the #define's for avoiding multiple includes:</p>
<div class="fragment"><div class="line">-#ifndef fltk_ComplexButton_h <span class="comment">// fltk_Button_h formerly</span></div>
<div class="line">-#define fltk_ComplexButton_h</div>
<div class="line">+#ifndef __FLTK_COMPLEX_BUTTON_HH__</div>
<div class="line">+#define __FLTK_COMPLEX_BUTTON_HH__</div>
</div><!-- fragment --><p>at the beginning and</p>
<div class="fragment"><div class="line">-#endif</div>
<div class="line">+#endif <span class="comment">// __FLTK_COMPLEX_BUTTON_HH__</span></div>
</div><!-- fragment --><p>at the end. Then, the namespace is changed:</p>
<div class="fragment"><div class="line">-<span class="keyword">namespace </span>fltk {</div>
<div class="line">+<span class="keyword">namespace </span><a class="code" href="namespacedw.html">dw</a> {</div>
<div class="line">+<span class="keyword">namespace </span>fltk {</div>
<div class="line">+<span class="keyword">namespace </span>ui {</div>
</div><!-- fragment --><p>at the beginning and</p>
<div class="fragment"><div class="line">-}</div>
<div class="line">+} <span class="comment">// namespace ui</span></div>
<div class="line">+} <span class="comment">// namespace fltk</span></div>
<div class="line">+} <span class="comment">// namespace dw</span></div>
</div><!-- fragment --><p>at the end. Most important, the base class is changed:</p>
<div class="fragment"><div class="line">-#include <span class="stringliteral">"FL/Fl_Widget.H"</span></div>
<div class="line">+#include <FL/Fl_Group.H></div>
</div><!-- fragment --><p>and</p>
<div class="fragment"><div class="line">-<span class="keyword">class </span>FL_API ComplexButton : <span class="keyword">public</span> Fl_Widget {</div>
<div class="line">+<span class="keyword">class </span>ComplexButton: <span class="keyword">public</span> Fl_Group</div>
<div class="line">+{</div>
</div><!-- fragment --><p>Finally, for dw::fltk::ui::ComplexButton::default_style, there is a namespace conflict:</p>
<div class="fragment"><div class="line">- <span class="keyword">static</span> NamedStyle* default_style;</div>
<div class="line">+ static ::fltk::NamedStyle* default_style;</div>
</div><!-- fragment --><h3>Changes in <a class="el" href="fltkcomplexbutton_8cc.html">fltkcomplexbutton.cc</a></h3>
<p>First, #include's:</p>
<div class="fragment"><div class="line"><span class="preprocessor"> #include <FL/Fl.H></span></div>
<div class="line">-#include <FL/ComplexButton.h> <span class="comment">// <FL/Fl_Button.H> formerly</span></div>
<div class="line"><span class="preprocessor"> #include <FL/Fl_Group.H></span></div>
<div class="line"><span class="preprocessor"> #include <FL/Fl_Window.H></span></div>
<div class="line">+</div>
<div class="line">+#include <span class="stringliteral">"fltkcomplexbutton.hh"</span></div>
</div><!-- fragment --><p>Second, namespaces:</p>
<div class="fragment"><div class="line">+<span class="keyword">using namespace </span><a class="code" href="namespacedw_1_1fltk_1_1ui.html">dw::fltk::ui</a>;</div>
</div><!-- fragment --><p>Since the base class is now Fl_Group, the constructor must be changed:</p>
<div class="fragment"><div class="line">-ComplexButton::ComplexButton(<span class="keywordtype">int</span> x,<span class="keywordtype">int</span> y,<span class="keywordtype">int</span> w,<span class="keywordtype">int</span> h, <span class="keyword">const</span> <span class="keywordtype">char</span> *l) : Fl_Widget(x,y,w,h,l) {</div>
<div class="line">+ComplexButton::ComplexButton(<span class="keywordtype">int</span> x,<span class="keywordtype">int</span> y,<span class="keywordtype">int</span> w,<span class="keywordtype">int</span> h, <span class="keyword">const</span> <span class="keywordtype">char</span> *l) :</div>
<div class="line">+ Fl_Group(x,y,w,h,l)</div>
<div class="line">+{</div>
</div><!-- fragment --><p>Finally, the button must draw its children (end of <a class="el" href="classdw_1_1fltk_1_1ui_1_1ComplexButton.html#a16f178a6d66081f759081026e88bbec6">dw::fltk::ui::ComplexButton::draw()</a>):</p>
<div class="fragment"><div class="line">+</div>
<div class="line">+ <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = children () - 1; i >= 0; i--)</div>
<div class="line">+ draw_child (*child (i));</div>
<div class="line"> }</div>
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