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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"><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="gtkdoc ppc">#include <stdlib.h></span>
<span class="gtkdoc ppc">#include <goocanvas.h></span>
<span class="gtkdoc kwb">static</span> gboolean <span class="function">on_rect_button_press</span> <span class="gtkdoc opt">(</span>GooCanvasItem <span class="gtkdoc opt">*</span>view<span class="gtkdoc opt">,</span>
GooCanvasItem <span class="gtkdoc opt">*</span>target<span class="gtkdoc opt">,</span>
GdkEventButton <span class="gtkdoc opt">*</span>event<span class="gtkdoc opt">,</span>
gpointer data<span class="gtkdoc opt">);</span>
<span class="gtkdoc kwb">static</span> gboolean <span class="function">on_delete_event</span> <span class="gtkdoc opt">(</span>GtkWidget <span class="gtkdoc opt">*</span>window<span class="gtkdoc opt">,</span>
GdkEvent <span class="gtkdoc opt">*</span>event<span class="gtkdoc opt">,</span>
gpointer unused_data<span class="gtkdoc opt">);</span>
<span class="gtkdoc kwb">int</span>
<span class="function">main</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">int</span> argc<span class="gtkdoc opt">,</span> <span class="gtkdoc kwb">char</span> <span class="gtkdoc opt">*</span>argv<span class="gtkdoc opt">[])</span>
<span class="gtkdoc opt">{</span>
GtkWidget <span class="gtkdoc opt">*</span>window<span class="gtkdoc opt">, *</span>scrolled_win<span class="gtkdoc opt">, *</span>canvas<span class="gtkdoc opt">;</span>
GooCanvasItemModel <span class="gtkdoc opt">*</span>root<span class="gtkdoc opt">, *</span>rect_model<span class="gtkdoc opt">, *</span>text_model<span class="gtkdoc opt">;</span>
GooCanvasItem <span class="gtkdoc opt">*</span>rect_item<span class="gtkdoc opt">;</span>
<span class="comment">/* Initialize GTK+. */</span>
gtk_set_locale <span class="gtkdoc opt">();</span>
<span class="function">gtk_init</span> <span class="gtkdoc opt">(&</span>argc<span class="gtkdoc opt">, &</span>argv<span class="gtkdoc opt">);</span>
<span class="comment">/* Create the window and widgets. */</span>
window <span class="gtkdoc opt">=</span> <span class="function">gtk_window_new</span> <span class="gtkdoc opt">(</span>GTK_WINDOW_TOPLEVEL<span class="gtkdoc opt">);</span>
<span class="function">gtk_window_set_default_size</span> <span class="gtkdoc opt">(</span><span class="function">GTK_WINDOW</span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">),</span> <span class="number">640</span><span class="gtkdoc opt">,</span> <span class="number">600</span><span class="gtkdoc opt">);</span>
<span class="function">gtk_widget_show</span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">);</span>
<span class="function">g_signal_connect</span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">,</span> <span class="string">"delete_event"</span><span class="gtkdoc opt">, (</span>GtkSignalFunc<span class="gtkdoc opt">)</span> on_delete_event<span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">);</span>
scrolled_win <span class="gtkdoc opt">=</span> <span class="function">gtk_scrolled_window_new</span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
<span class="function">gtk_scrolled_window_set_shadow_type</span> <span class="gtkdoc opt">(</span><span class="function">GTK_SCROLLED_WINDOW</span> <span class="gtkdoc opt">(</span>scrolled_win<span class="gtkdoc opt">),</span>
GTK_SHADOW_IN<span class="gtkdoc opt">);</span>
<span class="function">gtk_widget_show</span> <span class="gtkdoc opt">(</span>scrolled_win<span class="gtkdoc opt">);</span>
<span class="function">gtk_container_add</span> <span class="gtkdoc opt">(</span><span class="function">GTK_CONTAINER</span> <span class="gtkdoc opt">(</span>window<span class="gtkdoc opt">),</span> scrolled_win<span class="gtkdoc opt">);</span>
canvas <span class="gtkdoc opt">=</span> goo_canvas_new <span class="gtkdoc opt">();</span>
<span class="function">gtk_widget_set_size_request</span> <span class="gtkdoc opt">(</span>canvas<span class="gtkdoc opt">,</span> <span class="number">600</span><span class="gtkdoc opt">,</span> <span class="number">450</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="GooCanvas.html#goo-canvas-set-bounds">goo_canvas_set_bounds</a></span> <span class="gtkdoc opt">(</span><span class="function">GOO_CANVAS</span> <span class="gtkdoc opt">(</span>canvas<span class="gtkdoc opt">),</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">0</span><span class="gtkdoc opt">,</span> <span class="number">1000</span><span class="gtkdoc opt">,</span> <span class="number">1000</span><span class="gtkdoc opt">);</span>
<span class="function">gtk_widget_show</span> <span class="gtkdoc opt">(</span>canvas<span class="gtkdoc opt">);</span>
<span class="function">gtk_container_add</span> <span class="gtkdoc opt">(</span><span class="function">GTK_CONTAINER</span> <span class="gtkdoc opt">(</span>scrolled_win<span class="gtkdoc opt">),</span> canvas<span class="gtkdoc opt">);</span>
root <span class="gtkdoc opt">=</span> <span class="function"><a href="GooCanvasGroupModel.html#goo-canvas-group-model-new">goo_canvas_group_model_new</a></span> <span class="gtkdoc opt">(</span>NULL<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
<span class="comment">/* Add a few simple items. */</span>
rect_model <span class="gtkdoc opt">=</span> <span class="function"><a href="GooCanvasRectModel.html#goo-canvas-rect-model-new">goo_canvas_rect_model_new</a></span> <span class="gtkdoc opt">(</span>root<span class="gtkdoc opt">,</span> <span class="number">100</span><span class="gtkdoc opt">,</span> <span class="number">100</span><span class="gtkdoc opt">,</span> <span class="number">400</span><span class="gtkdoc opt">,</span> <span class="number">400</span><span class="gtkdoc opt">,</span>
<span class="string">"line-width"</span><span class="gtkdoc opt">,</span> <span class="number">10.0</span><span class="gtkdoc opt">,</span>
<span class="string">"radius-x"</span><span class="gtkdoc opt">,</span> <span class="number">20.0</span><span class="gtkdoc opt">,</span>
<span class="string">"radius-y"</span><span class="gtkdoc opt">,</span> <span class="number">10.0</span><span class="gtkdoc opt">,</span>
<span class="string">"stroke-color"</span><span class="gtkdoc opt">,</span> <span class="string">"yellow"</span><span class="gtkdoc opt">,</span>
<span class="string">"fill-color"</span><span class="gtkdoc opt">,</span> <span class="string">"red"</span><span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">);</span>
text_model <span class="gtkdoc opt">=</span> <span class="function"><a href="GooCanvasTextModel.html#goo-canvas-text-model-new">goo_canvas_text_model_new</a></span> <span class="gtkdoc opt">(</span>root<span class="gtkdoc opt">,</span> <span class="string">"Hello World"</span><span class="gtkdoc opt">,</span> <span class="number">300</span><span class="gtkdoc opt">,</span> <span class="number">300</span><span class="gtkdoc opt">, -</span><span class="number">1</span><span class="gtkdoc opt">,</span>
GTK_ANCHOR_CENTER<span class="gtkdoc opt">,</span>
<span class="string">"font"</span><span class="gtkdoc opt">,</span> <span class="string">"Sans 24"</span><span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="GooCanvasItemModel.html#goo-canvas-item-model-rotate">goo_canvas_item_model_rotate</a></span> <span class="gtkdoc opt">(</span>text_model<span class="gtkdoc opt">,</span> <span class="number">45</span><span class="gtkdoc opt">,</span> <span class="number">300</span><span class="gtkdoc opt">,</span> <span class="number">300</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="GooCanvas.html#goo-canvas-set-root-item-model">goo_canvas_set_root_item_model</a></span> <span class="gtkdoc opt">(</span><span class="function">GOO_CANVAS</span> <span class="gtkdoc opt">(</span>canvas<span class="gtkdoc opt">),</span> root<span class="gtkdoc opt">);</span>
<span class="comment">/* Connect a signal handler for the rectangle item. */</span>
rect_item <span class="gtkdoc opt">=</span> <span class="function"><a href="GooCanvas.html#goo-canvas-get-item">goo_canvas_get_item</a></span> <span class="gtkdoc opt">(</span><span class="function">GOO_CANVAS</span> <span class="gtkdoc opt">(</span>canvas<span class="gtkdoc opt">),</span> rect_model<span class="gtkdoc opt">);</span>
<span class="function">g_signal_connect</span> <span class="gtkdoc opt">(</span>rect_item<span class="gtkdoc opt">,</span> <span class="string">"button_press_event"</span><span class="gtkdoc opt">,</span>
<span class="gtkdoc opt">(</span>GtkSignalFunc<span class="gtkdoc opt">)</span> on_rect_button_press<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
<span class="comment">/* Pass control to the GTK+ main event loop. */</span>
gtk_main <span class="gtkdoc opt">();</span>
<span class="keyword">return</span> <span class="number">0</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</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="gtkdoc kwb">static</span> gboolean
<span class="function">on_rect_button_press</span> <span class="gtkdoc opt">(</span>GooCanvasItem <span class="gtkdoc opt">*</span>item<span class="gtkdoc opt">,</span>
GooCanvasItem <span class="gtkdoc opt">*</span>target<span class="gtkdoc opt">,</span>
GdkEventButton <span class="gtkdoc opt">*</span>event<span class="gtkdoc opt">,</span>
gpointer data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
<span class="function">g_print</span> <span class="gtkdoc opt">(</span><span class="string">"rect item received button press event</span><span class="gtkdoc esc">\n</span><span class="string">"</span><span class="gtkdoc opt">);</span>
<span class="keyword">return</span> TRUE<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</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="gtkdoc kwb">static</span> gboolean
<span class="function">on_delete_event</span> <span class="gtkdoc opt">(</span>GtkWidget <span class="gtkdoc opt">*</span>window<span class="gtkdoc opt">,</span>
GdkEvent <span class="gtkdoc opt">*</span>event<span class="gtkdoc opt">,</span>
gpointer unused_data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
<span class="function">exit</span> <span class="gtkdoc opt">(</span><span class="number">0</span><span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span></pre></td>
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