libgoocanvas-dev 0.15-1.1 / usr / share / gtk-doc / html / goocanvas / goocanvas-model-view-canvas.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Model/View Canvas Example</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.73.2">
<link rel="start" href="index.html" title="GooCanvas Reference Manual">
<link rel="up" href="ch01.html" title="Introduction">
<link rel="prev" href="goocanvas-simple-canvas.html" title="Simple Canvas Example">
<link rel="next" href="goocanvas-architecture.html" title="Underlying Architecture">
<meta name="generator" content="GTK-Doc V1.9 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
<link rel="chapter" href="ch01.html" title="Introduction">
<link rel="chapter" href="ch02.html" title="Core Objects">
<link rel="chapter" href="ch03.html" title="Standard Canvas Items">
<link rel="chapter" href="ch04.html" title="Standard Canvas Item Models">
<link rel="chapter" href="ch05.html" title="Miscellaneous">
</head>
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<div class="refentry" lang="en">
<a name="goocanvas-model-view-canvas"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle">Model/View Canvas Example</span></h2>
<p>Model/View Canvas Example &#8212; how to create a model/view canvas.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1" lang="en">
<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="informalexample"><pre class="programlisting">
  #include &lt;stdlib.h&gt;
  #include &lt;goocanvas.h&gt;
  
  
  static gboolean on_rect_button_press (GooCanvasItem  *view,
                                        GooCanvasItem  *target,
                                        GdkEventButton *event,
                                        gpointer        data);
  
  static gboolean on_delete_event      (GtkWidget      *window,
                                        GdkEvent       *event,
                                        gpointer        unused_data);
  
  
  int
  main (int argc, char *argv[])
  {
    GtkWidget *window, *scrolled_win, *canvas;
    GooCanvasItemModel *root, *rect_model, *text_model;
    GooCanvasItem *rect_item;
  
    /* Initialize GTK+. */
    gtk_set_locale&#160;();
    gtk_init (&amp;argc, &amp;argv);
  
    /* Create the window and widgets. */
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size (GTK_WINDOW (window), 640, 600);
    gtk_widget_show (window);
    g_signal_connect (window, "delete_event", (GtkSignalFunc) on_delete_event,
                      NULL);
  
    scrolled_win = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_win),
                                         GTK_SHADOW_IN);
    gtk_widget_show (scrolled_win);
    gtk_container_add (GTK_CONTAINER (window), scrolled_win);
  
    canvas = goo_canvas_new&#160;();
    gtk_widget_set_size_request (canvas, 600, 450);
    goo_canvas_set_bounds (GOO_CANVAS (canvas), 0, 0, 1000, 1000);
    gtk_widget_show (canvas);
    gtk_container_add (GTK_CONTAINER (scrolled_win), canvas);
  
    root = goo_canvas_group_model_new (NULL, NULL);
  
    /* Add a few simple items. */
    rect_model = goo_canvas_rect_model_new (root, 100, 100, 400, 400,
                                            "line-width", 10.0,
                                            "radius-x", 20.0,
                                            "radius-y", 10.0,
                                            "stroke-color", "yellow",
                                            "fill-color", "red",
                                            NULL);
  
    text_model = goo_canvas_text_model_new (root, "Hello World", 300, 300, -1,
                                            GTK_ANCHOR_CENTER,
                                            "font", "Sans 24",
                                            NULL);
    goo_canvas_item_model_rotate (text_model, 45, 300, 300);
  
    goo_canvas_set_root_item_model (GOO_CANVAS (canvas), root);
  
    /* Connect a signal handler for the rectangle item. */
    rect_item = goo_canvas_get_item (GOO_CANVAS (canvas), rect_model);
    g_signal_connect (rect_item, "button_press_event",
                      (GtkSignalFunc) on_rect_button_press, NULL);
  
    /* Pass control to the GTK+ main event loop. */
    gtk_main&#160;();
  
    return 0;
  }
  
  
  /* This handles button presses in item views. We simply output a message to
     the console. */
  static gboolean
  on_rect_button_press (GooCanvasItem  *item,
                        GooCanvasItem  *target,
                        GdkEventButton *event,
                        gpointer        data)
  {
    g_print ("rect item received button press event\n");
    return TRUE;
  }
  
  
  /* This is our handler for the "delete-event" signal of the window, which
     is emitted when the 'x' close button is clicked. We just exit here. */
  static gboolean
  on_delete_event (GtkWidget *window,
                   GdkEvent  *event,
                   gpointer   unused_data)
  {
    exit (0);
  }
 </pre></div>
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