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<h1>main.hh File Reference</h1>Initialization and main processing loop interface. <a href="#_details">More...</a>
<p>
<code>#include <<a class="elRef" doxygen="gfccore.tag:" href="pointer_8hh.html">gfc/pointer.hh</a>></code><br>
<code>#include <<a class="el" href="gdk_2types_8hh-source.html">gfc/gdk/types.hh</a>></code><br>
<code>#include <sigc++/sigc++.h></code><br>
<code>#include <gtk/gtkmain.h></code><br>
<code>#include <vector></code><br>
<p>
<a href="main_8hh-source.html">Go to the source code of this file.</a><h2>Namespaces</h2>
<ul>
<li>namespace <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a>
<li>namespace <a class="el" href="namespaceGFC_1_1Gdk.html">GFC::Gdk</a>
<li>namespace <a class="el" href="namespaceGFC_1_1Gtk.html">GFC::Gtk</a>
<li>namespace <a class="el" href="namespaceGFC_1_1Main.html">GFC::Main</a>
</ul>
<h2>Classes</h2>
<ul>
<li>class <a class="el" href="classGFC_1_1Main_1_1QuitSignal.html">GFC::Main::QuitSignal</a>
<dl class="el"><dd class="mdescRight">Quit signal class. <a href="classGFC_1_1Main_1_1QuitSignal.html#_details">More...</a><br></dl><li>class <a class="el" href="classGFC_1_1Main_1_1KeySnooperSignal.html">GFC::Main::KeySnooperSignal</a>
<dl class="el"><dd class="mdescRight">KeySnooper signal class. <a href="classGFC_1_1Main_1_1KeySnooperSignal.html#_details">More...</a><br></dl></ul>
<h2>Initializers</h2>
<ul>
<li>void <a class="el" href="namespaceGFC_1_1Main.html#a2">init</a> (int *argc, char ***argv)
<dl class="el"><dd class="mdescRight">Initialize the <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> library. <a href="#a2"></a><br></dl><li>bool <a class="el" href="namespaceGFC_1_1Main.html#a3">init_check</a> (int *argc, char ***argv)
<dl class="el"><dd class="mdescRight">Initialize the <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> library. <a href="#a3"></a><br></dl><li>void <a class="el" href="namespaceGFC_1_1Main.html#a4">init_add</a> (const sigc::slot< bool > &callback)
<dl class="el"><dd class="mdescRight">Register a slot to be called when the mainloop is started. <a href="#a4"></a><br></dl></ul>
<h2>Accessors</h2>
<ul>
<li>PangoLanguage * <a class="el" href="namespaceGFC_1_1Main.html#a5">default_language</a> ()
<dl class="el"><dd class="mdescRight">Get the default language currently in effect. <a href="#a5"></a><br></dl><li>bool <a class="el" href="namespaceGFC_1_1Main.html#a6">events_pending</a> ()
<dl class="el"><dd class="mdescRight">Checks if any events are pending. <a href="#a6"></a><br></dl><li>Pointer< Gdk::Event > <a class="el" href="namespaceGFC_1_1Main.html#a7">get_current_event</a> ()
<dl class="el"><dd class="mdescRight">Obtains a copy of the event currently being processed by GTK+. <a href="#a7"></a><br></dl><li>unsigned int <a class="el" href="namespaceGFC_1_1Main.html#a8">get_current_event_time</a> ()
<dl class="el"><dd class="mdescRight">If there is a current event and it has a timestamp, return that timestamp, otherwise return GDK_CURRENT_TIME. <a href="#a8"></a><br></dl><li>bool <a class="el" href="namespaceGFC_1_1Main.html#a9">get_current_event_state</a> (<a class="el" href="namespaceGFC_1_1Gdk.html#a136">Gdk::ModifierTypeField</a> *state)
<dl class="el"><dd class="mdescRight">If there is a current event and it has a state field, place that state field in <em>state</em> and return true, otherwise return false. <a href="#a9"></a><br></dl><li>Pointer< Gtk::Widget > <a class="el" href="namespaceGFC_1_1Main.html#a10">get_event_widget</a> (Gdk::Event &event)
<dl class="el"><dd class="mdescRight">Get the widget that originally received the <em>event</em>. <a href="#a10"></a><br></dl></ul>
<h2>Main Event Loop</h2>
<ul>
<li>void <a class="el" href="namespaceGFC_1_1Main.html#a11">run</a> ()
<dl class="el"><dd class="mdescRight">Runs the main loop until <a class="el" href="namespaceGFC_1_1Main.html#a13">quit()</a> is called. <a href="#a11"></a><br></dl><li>int <a class="el" href="namespaceGFC_1_1Main.html#a12">level</a> ()
<dl class="el"><dd class="mdescRight">Asks for the current nesting level of the main loop. <a href="#a12"></a><br></dl><li><a class="anchor" name="a13" doxytag="main.hh::quit" ></a>
void <a class="el" href="namespaceGFC_1_1Main.html#a13">quit</a> ()
<dl class="el"><dd class="mdescRight">Makes the innermost invocation of the main loop return when it regains control. <br></dl><li>bool <a class="el" href="namespaceGFC_1_1Main.html#a14">iterate</a> (bool blocking=true)
<dl class="el"><dd class="mdescRight">Runs a single iteration of the mainloop. <a href="#a14"></a><br></dl><li>void <a class="el" href="namespaceGFC_1_1Main.html#a15">grab_add</a> (Gtk::Widget &widget)
<dl class="el"><dd class="mdescRight">Makes <em>widget</em> the current grabbed widget. <a href="#a15"></a><br></dl><li>Pointer< Gtk::Widget > <a class="el" href="namespaceGFC_1_1Main.html#a16">grab_get_current</a> ()
<dl class="el"><dd class="mdescRight">Queries the current grab. <a href="#a16"></a><br></dl><li>void <a class="el" href="namespaceGFC_1_1Main.html#a17">grab_remove</a> (Gtk::Widget &widget)
<dl class="el"><dd class="mdescRight">Removes the grab from the given widget. <a href="#a17"></a><br></dl></ul>
<h2>Signals</h2>
<ul>
<li><a class="anchor" name="a0" doxytag="main.hh::quit_signal" ></a>
QuitSignal <a class="el" href="namespaceGFC_1_1Main.html#a0">quit_signal</a>
<dl class="el"><dd class="mdescRight">A namespace instance of the <a class="el" href="classGFC_1_1Main_1_1QuitSignal.html">QuitSignal</a> for connecting slots to be invoked at the termination of the current mainloop. <br></dl><li><a class="anchor" name="a1" doxytag="main.hh::key_snooper_signal" ></a>
KeySnooperSignal <a class="el" href="namespaceGFC_1_1Main.html#a1">key_snooper_signal</a>
<dl class="el"><dd class="mdescRight">A namespace instance of the <a class="el" href="classGFC_1_1Main_1_1KeySnooperSignal.html">KeySnooperSignal</a> for connecting slots that will receive keypress events. <br></dl></ul>
<h2>Defines</h2>
<ul>
<li><a class="anchor" name="a0" doxytag="main.hh::GFC_MAIN" ></a>
#define <a class="el" href="main_8hh.html#a0">GFC_MAIN</a>(MainWidget)
<dl class="el"><dd class="mdescRight">GFC_MAIN is a convenience macro that writes a simple main function. <br></dl></ul>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Initialization and main processing loop interface.
<p>
<a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> wraps the GTK+ initialization functions and events into the Main namespace rather than a static class. Before using <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a>, you need to initialize it. Initialization connects to the window system display, and parses some standard command line arguments. The <a class="el" href="namespaceGFC_1_1Main.html#a2">init()</a> function initializes <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a>. <a class="el" href="namespaceGFC_1_1Main.html#a2">init()</a> exits the application if errors occur; to avoid this, use <a class="el" href="namespaceGFC_1_1Main.html#a3">init_check()</a>. <a class="el" href="namespaceGFC_1_1Main.html#a3">init_check()</a> allows you to recover from a failed <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> initialization - you might start up your application in text mode instead.<p>
Like all GUI toolkits, <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> uses an event-driven programming model. When the user is doing nothing, <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> sits in the main loop and waits for input. If the user performs some action - say, a mouse click - then the main loop "wakes up" and delivers an event to <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a>. <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> forwards the event to one or more widgets.<p>
When widgets receive an event, they frequently emit one or more signals. Signals notify your program that "something interesting happened" by invoking slots you've connected to the signal with the signal's connect() method. Slots are callable objects that can be connected to signals. Slots can be used to connect static functions, class methods and function objects to a signal. When your slot is called it invokes your function or method.<p>
When your methods are invoked, you would typically take some action - for example, when an Open button is clicked you might display a Gtk::FileSelectionDialog. After a callback finishes, <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> will return to the main loop and await more user input.<hr><h2>Function Documentation</h2>
<a class="anchor" name="a5" doxytag="main.hh::default_language" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> PangoLanguage* default_language </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Get the default language currently in effect.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The ISO language code for the default language currently in effect.</dd></dl>
<br>
Note that this can change over the life of an application. The default language is derived from the current locale. It determines, for example, whether <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> uses the right-to-left or left-to-right text direction. </td>
</tr>
</table>
<a class="anchor" name="a6" doxytag="main.hh::events_pending" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> bool events_pending </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Checks if any events are pending.
<p>
<dl compact><dt><b>Returns:</b></dt><dd><em>true</em> if any events are pending, <em>false</em> otherwise.</dd></dl>
<br>
This can be used to update the GUI and invoke timeouts etc. while doing some time intensive computation.<p>
<b>Example:</b> Updating the GUI during a long computation. <div class="fragment"><pre> <span class="comment">// computation going on</span>
...
<span class="keywordflow">while</span> (<a class="code" href="namespaceGFC_1_1Main.html#a6">events_pending</a>())
<a class="code" href="namespaceGFC_1_1Main.html#a14">iterate</a>();
...
<span class="comment">// computation continued</span>
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="a7" doxytag="main.hh::get_current_event" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> Pointer<Gdk::Event> get_current_event </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Obtains a copy of the event currently being processed by GTK+.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>A copy of the current event, or null if there is no current event.</dd></dl>
<br>
For example, if you get a "clicked" signal from <a class="el" href="classGFC_1_1Gtk_1_1Button.html">Gtk::Button</a>, the current event will be the <a class="el" href="classGFC_1_1Gdk_1_1EventButton.html">Gdk::EventButton</a> that triggered the "clicked" signal. If there is no current event, the function returns null. </td>
</tr>
</table>
<a class="anchor" name="a9" doxytag="main.hh::get_current_event_state" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> bool get_current_event_state </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="namespaceGFC_1_1Gdk.html#a136">Gdk::ModifierTypeField</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>state</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
If there is a current event and it has a state field, place that state field in <em>state</em> and return true, otherwise return false.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>state</em> </td><td>The location to store the state of the current event. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd><em>true</em> if there was a current event and it had a state field. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a8" doxytag="main.hh::get_current_event_time" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> unsigned int get_current_event_time </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
If there is a current event and it has a timestamp, return that timestamp, otherwise return GDK_CURRENT_TIME.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The timestamp from the current event, or GDK_CURRENT_TIME. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a10" doxytag="main.hh::get_event_widget" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> Pointer<Gtk::Widget> get_event_widget </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">Gdk::Event & </td>
<td class="mdname1" valign="top" nowrap> <em>event</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Get the widget that originally received the <em>event</em>.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>event</em> </td><td>A reference to a <a class="el" href="classGFC_1_1Gdk_1_1Event.html">Gdk::Event</a>. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>The widget that originally received event, or null.</dd></dl>
<br>
If <em>event</em> is null or the event was not associated with any widget, returns null, otherwise returns the widget that received the event originally. The widget is returned as a smart pointer because there is the possiblity that the widget was wrapped for the first time and needs to be unreferenced. </td>
</tr>
</table>
<a class="anchor" name="a15" doxytag="main.hh::grab_add" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void grab_add </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">Gtk::Widget & </td>
<td class="mdname1" valign="top" nowrap> <em>widget</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Makes <em>widget</em> the current grabbed widget.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>widget</em> </td><td>The widget that grabs keyboard and pointer events.</td></tr>
</table>
</dl>
<br>
This means that interaction with other widgets in the same application is blocked and mouse as well as keyboard events are delivered to this widget. </td>
</tr>
</table>
<a class="anchor" name="a16" doxytag="main.hh::grab_get_current" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> Pointer<Gtk::Widget> grab_get_current </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Queries the current grab.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The widget which currently has the grab or null if no grab is active. </dd></dl>
</td>
</tr>
</table>
<a class="anchor" name="a17" doxytag="main.hh::grab_remove" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void grab_remove </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">Gtk::Widget & </td>
<td class="mdname1" valign="top" nowrap> <em>widget</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Removes the grab from the given widget.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>widget</em> </td><td>The widget which gives up the grab. You have to pair calls to <a class="el" href="namespaceGFC_1_1Main.html#a15">grab_add()</a> and <a class="el" href="namespaceGFC_1_1Main.html#a17">grab_remove()</a>. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="a2" doxytag="main.hh::init" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void init </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int * </td>
<td class="mdname" nowrap> <em>argc</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>char *** </td>
<td class="mdname" nowrap> <em>argv</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Initialize the <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> library.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>argc</em> </td><td>Address of the argc parameter of your main function. Changed if any arguments were handled. </td></tr>
<tr><td></td><td valign=top><em>argv</em> </td><td>Address of the argv parameter of main(). Any parameters understood by <a class="el" href="namespaceGFC_1_1Main.html#a2">init()</a> are stripped before returning.</td></tr>
</table>
</dl>
<br>
Call this method before using any other <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> methods in your GUI applications. It will initialize everything needed to operate the toolkit and parses some standard command line options. argc and argv are adjusted accordingly so your own code will never see those standard arguments. </td>
</tr>
</table>
<a class="anchor" name="a4" doxytag="main.hh::init_add" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void init_add </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const sigc::slot< bool > & </td>
<td class="mdname1" valign="top" nowrap> <em>callback</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Register a slot to be called when the mainloop is started.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>callback</em> </td><td>A slot to invoke when main() is called next.</td></tr>
</table>
</dl>
<br>
The callback slot should return false to remove it from the list of slots to call, otherwise it might get called again. </td>
</tr>
</table>
<a class="anchor" name="a3" doxytag="main.hh::init_check" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> bool init_check </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int * </td>
<td class="mdname" nowrap> <em>argc</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>char *** </td>
<td class="mdname" nowrap> <em>argv</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Initialize the <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> library.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>argc</em> </td><td>A reference to the argc of the main() function. </td></tr>
<tr><td></td><td valign=top><em>argv</em> </td><td>A reference to the argv of the main() function. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd><em>true</em> if the GUI has been successfully initialized, <em>false</em> otherwise.</dd></dl>
<br>
This method does the same work as <a class="el" href="namespaceGFC_1_1Main.html#a2">init()</a> with only a single change: It does not terminate the program if the GUI can't be initialized. Instead it returns <em>false</em> on failure. This way the application can fall back to some other means of communication with the user - for example a command line interface. </td>
</tr>
</table>
<a class="anchor" name="a14" doxytag="main.hh::iterate" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> bool iterate </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">bool </td>
<td class="mdname1" valign="top" nowrap> <em>blocking</em> = <code>true</code> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Runs a single iteration of the mainloop.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>blocking</em> </td><td>Set <em>true</em> if you want to block if no events are pending. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd><em>true</em> if <a class="el" href="namespaceGFC_1_1Main.html#a13">quit()</a> has been called for the innermost mainloop.</dd></dl>
<br>
If <em>blocking</em> is true and no events are waiting to be processed <a class="elRef" doxygen="gfccore.tag:" href="namespaceGFC.html">GFC</a> will block until the next event is noticed. If <em>blocking</em> is false and no events are available return. </td>
</tr>
</table>
<a class="anchor" name="a12" doxytag="main.hh::level" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> int level </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Asks for the current nesting level of the main loop.
<p>
<dl compact><dt><b>Returns:</b></dt><dd>The nesting level of the current invocation of the main loop.</dd></dl>
<br>
This can be useful when connecting a slot to the <em>quit_signal</em>. </td>
</tr>
</table>
<a class="anchor" name="a11" doxytag="main.hh::run" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void run </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Runs the main loop until <a class="el" href="namespaceGFC_1_1Main.html#a13">quit()</a> is called.
<p>
You can nest calls to <a class="el" href="namespaceGFC_1_1Main.html#a11">run()</a>. In that case <a class="el" href="namespaceGFC_1_1Main.html#a13">quit()</a> will make the innermost invocation of the main loop return. </td>
</tr>
</table>
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