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Member "gtkdatabox-1.0.0/examples/keycontrol.c" (31 Mar 2021, 6253 Bytes) of package /linux/privat/gtkdatabox-1.0.0.tar.gz:

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    1 /* $Id: keycontrol.c 4 2008-06-22 09:19:11Z rbock $ */
    2 /* GtkDatabox - An extension to the gtk+ library
    3  * Copyright (C) 1998 - 2008  Dr. Roland Bock
    4  *
    5  * This program is free software; you can redistribute it and/or
    6  * modify it under the terms of the GNU Lesser General Public License
    7  * as published by the Free Software Foundation; either version 2.1
    8  * of the License, or (at your option) any later version.
    9  * 
   10  * This program is distributed in the hope that it will be useful,
   11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13  * GNU Lesser General Public License for more details.
   14  * 
   15  * You should have received a copy of the GNU General Public License
   16  * along with this program; if not, write to the Free Software
   17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   18  */
   19 #include <stdio.h>
   20 
   21 #include <gtk/gtk.h>
   22 #include <gtkdatabox.h>
   23 #include <gtkdatabox_lines.h>
   24 #include <gtkdatabox_markers.h>
   25 #include <gdk/gdkkeysyms.h>
   26 #include <glib/gprintf.h>
   27 #include <math.h>
   28 
   29 #define POINTS 10
   30 
   31 /*----------------------------------------------------------------
   32  *  databox basics
   33  *----------------------------------------------------------------*/
   34 
   35 gfloat *X;
   36 gfloat *Y;
   37 gfloat *markX;
   38 gfloat *markY;
   39 guint markIndex;
   40 gchar markLabel[100];
   41 
   42 static void
   43 shift_markers (GtkDatabox * box, GtkDataboxMarkers * markers)
   44 {
   45    markX[0] = X[markIndex];
   46    markY[0] = Y[markIndex];
   47 
   48    g_sprintf (markLabel, "(%2.2f, %2.2f)", X[markIndex], Y[markIndex]);
   49    gtk_databox_markers_set_label (markers, 1,
   50                  GTK_DATABOX_MARKERS_TEXT_SW, markLabel, TRUE);
   51    gtk_widget_queue_draw (GTK_WIDGET(box));
   52 }
   53 
   54 static gint
   55 key_press_cb (GtkDatabox * box,
   56           GdkEventKey * event, GtkDataboxMarkers * markers)
   57 {
   58    if (event->type != GDK_KEY_PRESS)
   59       return FALSE;
   60 
   61    switch (event->keyval)
   62    {
   63    case GDK_KEY_KP_Right:
   64       if (markIndex < POINTS - 1)
   65       {
   66      markIndex++;
   67      shift_markers (box, markers);
   68       }
   69       break;
   70    case GDK_KEY_KP_Left:
   71       if (markIndex > 0)
   72       {
   73      markIndex--;
   74      shift_markers (box, markers);
   75       }
   76       break;
   77    case GDK_KEY_c:;
   78       break;
   79    case GDK_KEY_n:
   80       break;
   81    case GDK_KEY_p:
   82       g_printerr ("p");
   83       break;
   84    case GDK_KEY_h:
   85       gtk_databox_zoom_home (box);
   86       break;
   87    case GDK_KEY_o:
   88       gtk_databox_zoom_out (box);
   89       break;
   90    default:
   91       break;
   92    }
   93 
   94    return FALSE;
   95 }
   96 
   97 
   98 static void
   99 create_basics (void)
  100 {
  101    GtkWidget *window = NULL;
  102    GtkWidget *box1;
  103    GtkWidget *box2;
  104    GtkWidget *close_button;
  105    GtkWidget *box;
  106    GtkWidget *label;
  107    GtkWidget *separator;
  108    GtkWidget *table;
  109    GtkDataboxGraph *graph;
  110    GdkRGBA color;
  111    gfloat left, right, top, bottom;
  112    gint i;
  113 
  114    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  115    gtk_widget_set_size_request (window, 400, 400);
  116 
  117    g_signal_connect (G_OBJECT (window), "destroy",
  118              G_CALLBACK (gtk_main_quit), NULL);
  119 
  120    gtk_window_set_title (GTK_WINDOW (window), "GtkDatabox: Key Controls");
  121    gtk_container_set_border_width (GTK_CONTAINER (window), 0);
  122 
  123    box1 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
  124    gtk_container_add (GTK_CONTAINER (window), box1);
  125 
  126    label =
  127       gtk_label_new
  128       ("As long as the GtkDatabox has the focus,\nthe following keys will work in this example:\nKeypad-Right: Move markers to next data point\nKeypad-Left: Move markers to previous data point\no: zoom out (only useful if you zoomed in previously)\nh: zoom_home (only useful if you zoomed in previously)");
  129    gtk_box_pack_start (GTK_BOX (box1), label, FALSE, FALSE, 0);
  130    separator = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
  131    gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, FALSE, 0);
  132 
  133    gtk_databox_create_box_with_scrollbars_and_rulers (&box, &table,
  134                               TRUE, TRUE, TRUE, TRUE);
  135    gtk_widget_add_events (box, GDK_KEY_PRESS_MASK);
  136    gtk_widget_set_can_focus(box, TRUE);
  137    gtk_widget_set_can_default(box, TRUE);
  138 
  139    gtk_box_pack_start (GTK_BOX (box1), table, TRUE, TRUE, 0);
  140 
  141    gtk_databox_set_bg_color (GTK_DATABOX (box), "#545454");
  142 
  143    X = g_new0 (gfloat, POINTS);
  144    Y = g_new0 (gfloat, POINTS);
  145 
  146    for (i = 0; i < POINTS; i++)
  147    {
  148       X[i] = i;
  149       Y[i] = 100. * sin (i * 2 * G_PI / (POINTS - 1));
  150    }
  151    color.red = 0;
  152    color.green = 1;
  153    color.blue = 0;
  154    color.alpha = 1;
  155 
  156    graph = gtk_databox_lines_new (POINTS, X, Y, &color, 1);
  157    gtk_databox_graph_add (GTK_DATABOX (box), graph);
  158 
  159    markX = g_new0 (gfloat, 2);
  160    markY = g_new0 (gfloat, 2);
  161 
  162    color.red = 1;
  163    color.green = 0;
  164    color.blue = 0;
  165    color.alpha = 1;
  166 
  167    graph = gtk_databox_markers_new (2, markX, markY, &color, 7,
  168                    GTK_DATABOX_MARKERS_TRIANGLE);
  169    gtk_databox_markers_set_position (GTK_DATABOX_MARKERS (graph), 0,
  170                     GTK_DATABOX_MARKERS_S);
  171    gtk_databox_markers_set_position (GTK_DATABOX_MARKERS (graph), 1,
  172                     GTK_DATABOX_MARKERS_N);
  173    markIndex = 0;
  174    shift_markers (GTK_DATABOX (box), GTK_DATABOX_MARKERS (graph));
  175    gtk_databox_graph_add (GTK_DATABOX (box), graph);
  176 
  177    g_signal_connect (G_OBJECT (box), "key_press_event",
  178              G_CALLBACK (key_press_cb), graph);
  179 
  180    gtk_databox_auto_rescale (GTK_DATABOX (box), 0.05);
  181 
  182    gtk_databox_get_total_limits (GTK_DATABOX (box), &left, &right, &top,
  183                  &bottom);
  184 
  185    markX[1] = right;
  186    markY[1] = top;
  187 
  188    separator = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
  189    gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, TRUE, 0);
  190 
  191    box2 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 10);
  192    gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
  193    gtk_box_pack_end (GTK_BOX (box1), box2, FALSE, TRUE, 0);
  194    close_button = gtk_button_new_with_label ("close");
  195    g_signal_connect_swapped (G_OBJECT (close_button), "clicked",
  196                  G_CALLBACK (gtk_main_quit), G_OBJECT (box));
  197    gtk_box_pack_start (GTK_BOX (box2), close_button, TRUE, TRUE, 0);
  198    gtk_widget_grab_default (box);
  199    gtk_widget_grab_focus (box);
  200 
  201    gtk_widget_show_all (window);
  202    gdk_window_set_cursor (gtk_widget_get_window(box), gdk_cursor_new_for_display (gdk_display_get_default (), GDK_CROSS));
  203 }
  204 
  205 gint
  206 main (gint argc, char *argv[])
  207 {
  208    gtk_init (&argc, &argv);
  209 
  210    create_basics ();
  211    gtk_main ();
  212 
  213    return 0;
  214 }