irrlicht/examples/05.UserInterface/tutorial.html

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<div class="title">Tutorial 5: User Interface </div> </div>
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<p>This tutorial shows how to use the built in User Interface of the Irrlicht Engine. It will give a brief overview and show how to create and use windows, buttons, scroll bars, static texts, and list boxes.</p>
<p>As always, we include the header files, and use the irrlicht namespaces. We also store a pointer to the Irrlicht device, a counter variable for changing the creation position of a window, and a pointer to a listbox. </p><div class="fragment"><div class="line"><span class="preprocessor">#include &lt;irrlicht.h&gt;</span></div><div class="line"><span class="preprocessor">#include &quot;driverChoice.h&quot;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span>irr;</div><div class="line"></div><div class="line"><span class="keyword">using namespace </span>core;</div><div class="line"><span class="keyword">using namespace </span>scene;</div><div class="line"><span class="keyword">using namespace </span>video;</div><div class="line"><span class="keyword">using namespace </span>io;</div><div class="line"><span class="keyword">using namespace </span>gui;</div><div class="line"></div><div class="line"><span class="preprocessor">#ifdef _IRR_WINDOWS_</span></div><div class="line"><span class="preprocessor">#pragma comment(lib, &quot;Irrlicht.lib&quot;)</span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></div><div class="line"><span class="comment">// Declare a structure to hold some context for the event receiver so that it</span></div><div class="line"><span class="comment">// has it available inside its OnEvent() method.</span></div><div class="line"><span class="keyword">struct </span>SAppContext</div><div class="line">{</div><div class="line"> IrrlichtDevice *device;</div><div class="line"> s32 counter;</div><div class="line"> IGUIListBox* listbox;</div><div class="line">};</div><div class="line"></div><div class="line"><span class="comment">// Define some values that we&#39;ll use to identify individual GUI controls.</span></div><div class="line"><span class="keyword">enum</span></div><div class="line">{</div><div class="line"> GUI_ID_QUIT_BUTTON = 101,</div><div class="line"> GUI_ID_NEW_WINDOW_BUTTON,</div><div class="line"> GUI_ID_FILE_OPEN_BUTTON,</div><div class="line"> GUI_ID_TRANSPARENCY_SCROLL_BAR</div><div class="line">};</div></div><!-- fragment --><p> Set the skin transparency by changing the alpha values of all skin-colors </p><div class="fragment"><div class="line"><span class="keywordtype">void</span> setSkinTransparency(s32 alpha, irr::gui::IGUISkin * skin)</div><div class="line">{</div><div class="line"> <span class="keywordflow">for</span> (s32 i=0; i&lt;irr::gui::EGDC_COUNT ; ++i)</div><div class="line"> {</div><div class="line"> video::SColor col = skin-&gt;getColor((EGUI_DEFAULT_COLOR)i);</div><div class="line"> col.setAlpha(alpha);</div><div class="line"> skin-&gt;setColor((EGUI_DEFAULT_COLOR)i, col);</div><div class="line"> }</div><div class="line">}</div></div><!-- fragment --><p> The Event Receiver is not only capable of getting keyboard and mouse input events, but also events of the graphical user interface (gui). There are events for almost everything: Button click, Listbox selection change, events that say that a element was hovered and so on. To be able to react to some of these events, we create an event receiver. We only react to gui events, and if it's such an event, we get the id of the caller (the gui element which caused the event) and get the pointer to the gui environment. </p><div class="fragment"><div class="line"><span class="keyword">class </span>MyEventReceiver : <span class="keyword">public</span> IEventReceiver</div><div class="line">{</div><div class="line"><span class="keyword">public</span>:</div><div class="line"> MyEventReceiver(SAppContext &amp; context) : Context(context) { }</div><div class="line"></div><div class="line"> <span class="keyword">virtual</span> <span class="keywordtype">bool</span> OnEvent(<span class="keyword">const</span> SEvent&amp; event)</div><div class="line"> {</div><div class="line"> <span class="keywordflow">if</span> (event.EventType == EET_GUI_EVENT)</div><div class="line">
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