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<h1>GFC::Gtk::DrawingArea Class Reference</h1>A GtkDrawingArea C++ wrapper class.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="drawingarea_8hh-source.html">gfc/gtk/drawingarea.hh</a>></code>
<p>
<p>Inheritance diagram for GFC::Gtk::DrawingArea:
<p><center><img src="classGFC_1_1Gtk_1_1DrawingArea.png" usemap="#GFC::Gtk::DrawingArea_map" border="0" alt=""></center>
<map name="GFC::Gtk::DrawingArea_map">
<area href="classGFC_1_1Gtk_1_1Widget.html" alt="GFC::Gtk::Widget" shape="rect" coords="76,224,219,248">
<area href="classGFC_1_1Gtk_1_1Object.html" alt="GFC::Gtk::Object" shape="rect" coords="0,168,143,192">
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<area doxygen="gfccore.tag:" href="classGFC_1_1G_1_1Object.html" alt="GFC::G::Object" shape="rect" coords="0,112,143,136">
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</map>
<a href="classGFC_1_1Gtk_1_1DrawingArea-members.html">List of all members.</a><h2>Public Member Functions</h2>
<tr><td colspan="2"><div class="groupHeader">Constructors</div></td></tr>
<ul>
<li><a class="anchor" name="z487_0" doxytag="GFC::Gtk::DrawingArea::DrawingArea" ></a>
<a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html#z487_0">DrawingArea</a> ()
<dl class="el"><dd class="mdescRight">Construct a new <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a>. <br></dl><li><a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html#z487_1">DrawingArea</a> (int width, int height)
<dl class="el"><dd class="mdescRight">Construct a new <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> with the specified width and height. <a href="#z487_1"></a><br></dl><li><a class="anchor" name="z487_2" doxytag="GFC::Gtk::DrawingArea::~DrawingArea" ></a>
virtual <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html#z487_2">~DrawingArea</a> ()
<dl class="el"><dd class="mdescRight">Destructor. <br></dl></ul>
<tr><td colspan="2"><div class="groupHeader">Accessors</div></td></tr>
<ul>
<li><a class="anchor" name="z488_0" doxytag="GFC::Gtk::DrawingArea::gtk_drawing_area" ></a>
GtkDrawingArea * <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html#z488_0">gtk_drawing_area</a> () const
<dl class="el"><dd class="mdescRight">Get a pointer to the GtkDrawingArea structure. <br></dl><li><a class="anchor" name="z488_1" doxytag="GFC::Gtk::DrawingArea::operator GtkDrawingArea *" ></a>
<a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html#z488_1">operator GtkDrawingArea *</a> () const
<dl class="el"><dd class="mdescRight">Conversion operator; safely converts a <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> to a GtkDrawingArea pointer. <br></dl></ul>
<h2>Protected Member Functions</h2>
<tr><td colspan="2"><div class="groupHeader">Constructors</div></td></tr>
<ul>
<li><a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html#z486_0">DrawingArea</a> (GtkDrawingArea *drawing_area, bool <a class="elRef" doxygen="gfccore.tag:" href="classGFC_1_1Trackable.html#z143_1">owns_reference</a>=false)
<dl class="el"><dd class="mdescRight">Construct a new <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> from an existing GtkDrawingArea. <a href="#z486_0"></a><br></dl></ul>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A GtkDrawingArea C++ wrapper class.
<p>
The <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> widget is used for creating custom user interface elements. It's essentially a blank widget you can draw on. After creating a drawing area, the application may want to connect to mouse and button press signals to respond to input from the user. Use <a class="el" href="classGFC_1_1Gtk_1_1Widget.html#z1053_58">Gtk::Widget::add_events()</a> to enable events you wish to receive. Connect to the "realize" signal to take any necessary actions when the widget is instantiated on a particular display. (Create GDK resources in response to this signal.) Connect to the "configure_event" signal to take any necessary actions when the widget changes size. Connect to the "expose_event" signal to handle redrawing the contents of the widget.<p>
The following code portion demonstrates using a drawing area to display a circle in the normal widget foreground color. Note that GDK automatically clears the exposed area to the background color before sending the expose event, and that drawing is implicitly clipped to the exposed area.<p>
<b>Example:</b> Simple <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> usage. <div class="fragment"><pre><span class="preprocessor"> #include <gfc/main.h></span>
<span class="preprocessor"> #include <gfc/gtk/drawingarea.h></span>
<span class="preprocessor"> #include <gfc/gtk/style.h></span>
<span class="preprocessor"> #include <gfc/gtk/window.h></span>
<span class="preprocessor"> #include <gfc/gdk/window.h></span>
<span class="keyword">using</span> <span class="keyword">namespace </span>GFC;
<span class="keyword">class </span>Window : <span class="keyword">public</span> Gtk::Window
{
Gtk::DrawingArea *area;
<span class="keyword">protected</span>:
<span class="keywordtype">bool</span> on_area_expose_event(GdkEventExpose *event);
<span class="keyword">public</span>:
Window();
};
Window::Window()
{
area = <span class="keyword">new</span> Gtk::DrawingArea(100, 100);
area->sig_expose_event().connect(slot(<span class="keyword">this</span>, &Window::on_area_expose_event));
add(*area);
area->show();
}
<span class="keywordtype">bool</span>
Window::on_area_expose_event(GdkEventExpose *event)
{
area->get_window()->draw_arc(*area->get_style()->fg_gc(area->get_state()), <span class="comment">// context</span>
0, 0, <span class="comment">// x, y,</span>
area->get_allocation().width, <span class="comment">// width</span>
area->get_allocation().height, <span class="comment">// height</span>
0, 64 * 360); <span class="comment">// angle1, angle2</span>
<span class="keywordflow">return</span> <span class="keyword">true</span>;
}
<span class="keywordtype">int</span> main (<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])
{
<span class="keyword">using</span> <span class="keyword">namespace </span>Main;
<a class="code" href="namespaceGFC_1_1Main.html#a2">init</a>(&argc, &argv);
Window window;
window.sig_destroy().connect(slot(&GFC::Main::quit));
window->show();
<a class="code" href="namespaceGFC_1_1Main.html#a11">run</a>();
<span class="keywordflow">return</span> 0;
}
</pre></div><p>
Expose events are normally delivered when a drawing area first comes onscreen, or when it's covered by another window and then uncovered (exposed). You can also force an expose event by adding to the "damage region" of the drawing area's window; <a class="el" href="classGFC_1_1Gtk_1_1Widget.html#z1053_15">Gtk::Widget::queue_draw_area()</a> and Gdk::Window::invalidate_rect() are equally good ways to do this. You'll then get an expose event for the invalid region. (See also Gdk::Pixbuf::render_to_drawable() for drawing a <a class="el" href="classGFC_1_1Gdk_1_1Pixbuf.html">Gdk::Pixbuf</a>.)<p>
To receive mouse events on a drawing area, you will need to enable them with <a class="el" href="classGFC_1_1Gtk_1_1Widget.html#z1053_58">Gtk::Widget::add_events()</a>. To receive keyboard events, you will need to set the CAN_FOCUS flag on the drawing area, and should probably draw some user-visible indication that the drawing area is focused. Use <a class="el" href="classGFC_1_1Gtk_1_1Widget.html#z1052_12">Gtk::Widget::has_focus()</a> in your expose event handler to decide whether to draw the focus indicator. (See <a class="el" href="classGFC_1_1Gtk_1_1Style.html#z850_20">Gtk::Style::draw_focus()</a> for one way to draw the focus.)
<p>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="z486_0" doxytag="GFC::Gtk::DrawingArea::DrawingArea" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
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<tr>
<td class="md" nowrap valign="top"> GFC::Gtk::DrawingArea::DrawingArea </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">GtkDrawingArea * </td>
<td class="mdname" nowrap> <em>drawing_area</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>bool </td>
<td class="mdname" nowrap> <em>owns_reference</em> = <code>false</code></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [explicit, protected]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Construct a new <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> from an existing GtkDrawingArea.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>drawing_area</em> </td><td>A pointer to a GtkDrawingArea. </td></tr>
<tr><td></td><td valign=top><em>owns_reference</em> </td><td>Set false if the initial reference count is floating, set true if it's not.</td></tr>
</table>
</dl>
<br>
The <em>drawing_area</em> can be a newly created GtkDrawingArea or an existing GtkDrawingArea (see <a class="elRef" doxygen="gfccore.tag:" href="classGFC_1_1G_1_1Object.html#z68_0">G::Object::Object</a>). </td>
</tr>
</table>
<a class="anchor" name="z487_1" doxytag="GFC::Gtk::DrawingArea::DrawingArea" ></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"> GFC::Gtk::DrawingArea::DrawingArea </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">int </td>
<td class="mdname" nowrap> <em>width</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>int </td>
<td class="mdname" nowrap> <em>height</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>
Construct a new <a class="el" href="classGFC_1_1Gtk_1_1DrawingArea.html">DrawingArea</a> with the specified width and height.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign=top><em>width</em> </td><td>The width to request. </td></tr>
<tr><td></td><td valign=top><em>height</em> </td><td>The height to request. </td></tr>
</table>
</dl>
</td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="drawingarea_8hh-source.html">drawingarea.hh</a></ul>
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