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<title>GooCanvas Reference Manual: Model/View Canvas Example</title>
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<a name="goocanvas-model-view-canvas"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Model/View Canvas Example</span></h2>
<p>Model/View Canvas Example — how to create a model/view canvas.</p>
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<div class="refsect1">
<a name="model-view-overview"></a><h2>Model View Canvas Example</h2>
<p>
Here's a complete example application that creates a model-view <a class="link" href="GooCanvas.html" title="GooCanvas"><span class="type">GooCanvas</span></a>
with a rectangle and a text item in it.
</p>
<div class="note">
<h3 class="title">Note</h3>
<p>
The Model/View canvas feature may be removed in a future version of
GooCanvas.
</p>
</div>
<div class="informalexample">
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<td class="listing_code"><pre class="programlisting"><span class="preproc">#include</span><span class="normal"> </span><span class="string"><stdlib.h></span>
<span class="preproc">#include</span><span class="normal"> </span><span class="string"><goocanvas.h></span>
<span class="keyword">static</span><span class="normal"> </span><span class="usertype">gboolean</span><span class="normal"> </span><span class="function">on_rect_button_press</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GooCanvasItem</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">view</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GooCanvasItem</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">target</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GdkEventButton</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">event</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> data</span><span class="symbol">);</span>
<span class="keyword">static</span><span class="normal"> </span><span class="usertype">gboolean</span><span class="normal"> </span><span class="function">on_delete_event</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GtkWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">window</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GdkEvent</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">event</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> unused_data</span><span class="symbol">);</span>
<span class="type">int</span>
<span class="function">main</span><span class="normal"> </span><span class="symbol">(</span><span class="type">int</span><span class="normal"> argc</span><span class="symbol">,</span><span class="normal"> </span><span class="type">char</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">argv</span><span class="symbol">[])</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="usertype">GtkWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">window</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">scrolled_win</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">canvas</span><span class="symbol">;</span>
<span class="normal"> </span><span class="usertype">GooCanvasItemModel</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">root</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">rect_model</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">text_model</span><span class="symbol">;</span>
<span class="normal"> </span><span class="usertype">GooCanvasItem</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">rect_item</span><span class="symbol">;</span>
<span class="normal"> </span><span class="comment">/* Initialize GTK+. */</span>
<span class="normal"> gtk_set_locale </span><span class="symbol">();</span>
<span class="normal"> </span><span class="function">gtk_init</span><span class="normal"> </span><span class="symbol">(&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argv</span><span class="symbol">);</span>
<span class="normal"> </span><span class="comment">/* Create the window and widgets. */</span>
<span class="normal"> window </span><span class="symbol">=</span><span class="normal"> </span><span class="function">gtk_window_new</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">GTK_WINDOW_TOPLEVEL</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_window_set_default_size</span><span class="normal"> </span><span class="symbol">(</span><span class="function">GTK_WINDOW</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">window</span><span class="symbol">),</span><span class="normal"> </span><span class="number">640</span><span class="symbol">,</span><span class="normal"> </span><span class="number">600</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_widget_show</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">window</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">g_signal_connect</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">window</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"delete_event"</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">GtkSignalFunc</span><span class="symbol">)</span><span class="normal"> on_delete_event</span><span class="symbol">,</span>
<span class="normal"> NULL</span><span class="symbol">);</span>
<span class="normal"> scrolled_win </span><span class="symbol">=</span><span class="normal"> </span><span class="function">gtk_scrolled_window_new</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">NULL</span><span class="symbol">,</span><span class="normal"> NULL</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_scrolled_window_set_shadow_type</span><span class="normal"> </span><span class="symbol">(</span><span class="function">GTK_SCROLLED_WINDOW</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">scrolled_win</span><span class="symbol">),</span>
<span class="normal"> GTK_SHADOW_IN</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_widget_show</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">scrolled_win</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_container_add</span><span class="normal"> </span><span class="symbol">(</span><span class="function">GTK_CONTAINER</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">window</span><span class="symbol">),</span><span class="normal"> scrolled_win</span><span class="symbol">);</span>
<span class="normal"> canvas </span><span class="symbol">=</span><span class="normal"> goo_canvas_new </span><span class="symbol">();</span>
<span class="normal"> </span><span class="function">gtk_widget_set_size_request</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">canvas</span><span class="symbol">,</span><span class="normal"> </span><span class="number">600</span><span class="symbol">,</span><span class="normal"> </span><span class="number">450</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="GooCanvas.html#goo-canvas-set-bounds">goo_canvas_set_bounds</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function">GOO_CANVAS</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">canvas</span><span class="symbol">),</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1000</span><span class="symbol">,</span><span class="normal"> </span><span class="number">1000</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_widget_show</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">canvas</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">gtk_container_add</span><span class="normal"> </span><span class="symbol">(</span><span class="function">GTK_CONTAINER</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">scrolled_win</span><span class="symbol">),</span><span class="normal"> canvas</span><span class="symbol">);</span>
<span class="normal"> root </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GooCanvasGroupModel.html#goo-canvas-group-model-new">goo_canvas_group_model_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">NULL</span><span class="symbol">,</span><span class="normal"> NULL</span><span class="symbol">);</span>
<span class="normal"> </span><span class="comment">/* Add a few simple items. */</span>
<span class="normal"> rect_model </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GooCanvasRectModel.html#goo-canvas-rect-model-new">goo_canvas_rect_model_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">root</span><span class="symbol">,</span><span class="normal"> </span><span class="number">100</span><span class="symbol">,</span><span class="normal"> </span><span class="number">100</span><span class="symbol">,</span><span class="normal"> </span><span class="number">400</span><span class="symbol">,</span><span class="normal"> </span><span class="number">400</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"line-width"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">10.0</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"radius-x"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">20.0</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"radius-y"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">10.0</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"stroke-color"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"yellow"</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"fill-color"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"red"</span><span class="symbol">,</span>
<span class="normal"> NULL</span><span class="symbol">);</span>
<span class="normal"> text_model </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GooCanvasTextModel.html#goo-canvas-text-model-new">goo_canvas_text_model_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">root</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"Hello World"</span><span class="symbol">,</span><span class="normal"> </span><span class="number">300</span><span class="symbol">,</span><span class="normal"> </span><span class="number">300</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">-</span><span class="number">1</span><span class="symbol">,</span>
<span class="normal"> GTK_ANCHOR_CENTER</span><span class="symbol">,</span>
<span class="normal"> </span><span class="string">"font"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"Sans 24"</span><span class="symbol">,</span>
<span class="normal"> NULL</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="GooCanvasItemModel.html#goo-canvas-item-model-rotate">goo_canvas_item_model_rotate</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">text_model</span><span class="symbol">,</span><span class="normal"> </span><span class="number">45</span><span class="symbol">,</span><span class="normal"> </span><span class="number">300</span><span class="symbol">,</span><span class="normal"> </span><span class="number">300</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function"><a href="GooCanvas.html#goo-canvas-set-root-item-model">goo_canvas_set_root_item_model</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function">GOO_CANVAS</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">canvas</span><span class="symbol">),</span><span class="normal"> root</span><span class="symbol">);</span>
<span class="normal"> </span><span class="comment">/* Connect a signal handler for the rectangle item. */</span>
<span class="normal"> rect_item </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GooCanvas.html#goo-canvas-get-item">goo_canvas_get_item</a></span><span class="normal"> </span><span class="symbol">(</span><span class="function">GOO_CANVAS</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">canvas</span><span class="symbol">),</span><span class="normal"> rect_model</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">g_signal_connect</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">rect_item</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"button_press_event"</span><span class="symbol">,</span>
<span class="normal"> </span><span class="symbol">(</span><span class="normal">GtkSignalFunc</span><span class="symbol">)</span><span class="normal"> on_rect_button_press</span><span class="symbol">,</span><span class="normal"> NULL</span><span class="symbol">);</span>
<span class="normal"> </span><span class="comment">/* Pass control to the GTK+ main event loop. */</span>
<span class="normal"> gtk_main </span><span class="symbol">();</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span>
<span class="cbracket">}</span>
<span class="comment">/* This handles button presses in item views. We simply output a message to</span>
<span class="comment"> the console. */</span>
<span class="keyword">static</span><span class="normal"> gboolean</span>
<span class="function">on_rect_button_press</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GooCanvasItem</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">item</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GooCanvasItem</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">target</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GdkEventButton</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">event</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="function">g_print</span><span class="normal"> </span><span class="symbol">(</span><span class="string">"rect item received button press event</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">);</span>
<span class="normal"> </span><span class="keyword">return</span><span class="normal"> TRUE</span><span class="symbol">;</span>
<span class="cbracket">}</span>
<span class="comment">/* This is our handler for the "delete-event" signal of the window, which</span>
<span class="comment"> is emitted when the 'x' close button is clicked. We just exit here. */</span>
<span class="keyword">static</span><span class="normal"> gboolean</span>
<span class="function">on_delete_event</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GtkWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">window</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">GdkEvent</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">event</span><span class="symbol">,</span>
<span class="normal"> </span><span class="usertype">gpointer</span><span class="normal"> unused_data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal"> </span><span class="function">exit</span><span class="normal"> </span><span class="symbol">(</span><span class="number">0</span><span class="symbol">);</span>
<span class="cbracket">}</span></pre></td>
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