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Re: Lucky B.C.'s reply to GtkDrawingArea "width" and "height" <properties>

Thanks Lucky B. C. for replying to my email, I have already tried

                  <property name="width">4000</property>

                  <property name="height">1000</property>

without success (see code below).

     I am attempting to draw a Cairo line from two points entered with spin buttons that is built with 
builder.ui, using C language on Ubuntu 14.04, with Gtk+ 3.0. I have already built a gui coded in C without 
using a builder.ui file and am now attempting to reproduce this with a builder.ui to make the application. 
The interface opens, the 'hello' and 'quit' buttons work, the spinbuttons are (now) working correctly, but I 
am encountering two or three problems with drawing that may or may not be connected:

1) I cannot work out how to set the size of the GtkDrawingArea in the builder.ui file, which is a simple 
thing to do in the program using, for example:



  darea = gtk_drawing_area_new();

  gtk_widget_set_size_request (darea, 800, 500);

  gtk_fixed_put (GTK_FIXED (fixed), darea, 0, 0);

  g_signal_connect(G_OBJECT(darea), "draw", G_CALLBACK(on_draw_event), NULL);



2) Despite the warnings the Cairo drawing is drawn when I click on tab2, although ultimately I would like to 
use a GtkLayout to contain spinbuttons and the drawing within the same notebook page, and to have the drawing 
updated as the spinbutton values are changed, so far with no success, but for now let's deal with the sizing 
of the GtkDrawingArea, so that my pre-existing gui program can be converted into an application.



Any help with these problems would be greatly appreciated, sorry about the length of this email, if the code 
below is copied to your computer it should run, thanks, Roger.



With the drawing area “width” and “height” <properties> commented-out in builder.ui these are the commands, 
errors and warnings:



$ gedit darea_widthheight.c

$ make

gcc -mcmodel=large `pkg-config --cflags gtk+-3.0` -o darea_widthheight darea_widthheight.c `pkg-config --libs 
gtk+-3.0` -lm

$ ./darea_widthheight

(darea_widthheight:2787): Gtk-CRITICAL **: gtk_buildable_add_child: assertion 'iface->add_child != NULL' 
failed

(darea_widthheight:2787): Gtk-CRITICAL **: gtk_buildable_add_child: assertion 'iface->add_child != NULL' 
failed

(darea_widthheight:2787): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkWindow'

(darea_widthheight:2787): Gtk-CRITICAL **: gtk_window_get_size: assertion 'GTK_IS_WINDOW (window)' failed

winwidth_draw1 = 1734702190, winheight_draw1 = 741438053

Hello World

$



Then when the drawing area “width” and “height” <properties> are uncommented in builder.ui, note that “width” 
and “height” <properties> are not recognised.



$ ./darea_widthheight

(darea_widthheight:2928): Gtk-CRITICAL **: gtk_buildable_add_child: assertion 'iface->add_child != NULL' 
failed

(darea_widthheight:2928): Gtk-CRITICAL **: gtk_buildable_add_child: assertion 'iface->add_child != NULL' 
failed

(darea_widthheight:2928): Gtk-WARNING **: Unknown property: GtkDrawingArea.width

(darea_widthheight:2928): Gtk-WARNING **: Unknown property: GtkDrawingArea.height

(darea_widthheight:2928): GLib-GObject-WARNING **: invalid unclassed pointer in cast to 'GtkWindow'

(darea_widthheight:2928): Gtk-CRITICAL **: gtk_window_get_size: assertion 'GTK_IS_WINDOW (window)' failed

winwidth_draw1 = 1734702190, winheight_draw1 = 741438053

Hello World

$



darea_widthheight.c----------------------------------------------------------------------------:

#include <stdio.h>

#include <math.h>

#include <errno.h>

#include <sys/time.h>

#include <sys/resource.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <gtk/gtk.h>



float float1 = 53.1;

int integer1 = 53;



static void

print_hello (GtkWidget *widget, gpointer   data)

{

  g_print ("Hello World\n");

}



static void get_new_number_float_float1(GtkWidget *widget, gpointer data)

{

float1 = gtk_spin_button_get_value(GTK_SPIN_BUTTON(widget));

write_file2();

}



static void get_new_number_int_integer1(GtkWidget *widget, gpointer data)

{

integer1 = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(widget));

write_file2();

}



static void do_drawing1(cairo_t *, GtkWidget *);



static gboolean on_draw_event(GtkWidget *widget, cairo_t *cr,

    gpointer user_data)

{

do_drawing1(cr, widget);

return FALSE;

}



static void do_drawing1(cairo_t *cr, GtkWidget *widget)

{

  GtkWidget *win = gtk_widget_get_toplevel(widget);



char paramname1, paramname2;

 FILE* infile_file2 = fopen("file2", "r");

 fscanf(infile_file2,"%s %f\n%s %d\n", &paramname1, &float1, &paramname2, &integer1);

 fclose(infile_file2);



  int winwidth_draw1, winheight_draw1;

  gtk_window_get_size(GTK_WINDOW(win), &winwidth_draw1, &winheight_draw1);

printf("winwidth_draw1 = %d, winheight_draw1 = %d\n", winwidth_draw1, winheight_draw1);

  cairo_set_source_rgb(cr, 0.6, 0.0, 0.0);

  cairo_set_line_width(cr, 1.0);

  cairo_move_to(cr, float1, float1);

  cairo_line_to(cr, integer1, integer1);

  cairo_stroke(cr);

}



static void activate (GtkApplication *app, gpointer user_data)

{

int   argc;

char **argv;



  GtkBuilder *builder1;

  GObject *window, *notebook;

  GObject *label1, *spin_float1, *adjustment1;

  GObject *label2, *spin_int1, *adjustment2;

  GObject *notebook_tab1;

  GObject *drawing1;

  GObject *notebook_tab2;

  GObject *button_hello;

  GObject *notebook_tab3;

  GObject *button_quit;

  GObject *notebook_tab4;



  gtk_init (&argc, &argv);



  /* Construct a GtkBuilder instance and load our UI description */

  builder1 = gtk_builder_new ();

  gtk_builder_add_from_file (builder1, "builder2.ui", NULL);



  /* Connect signal handlers to the constructed widgets. */

  window = gtk_builder_get_object (builder1, "window");

  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);



  spin_float1 = gtk_builder_get_object (builder1, "button1");

  g_signal_connect (spin_float1, "value-changed", G_CALLBACK (get_new_number_float_float1), NULL);

  g_signal_connect (spin_float1, "scroll-event", G_CALLBACK(gtk_true), NULL);



  spin_int1 = gtk_builder_get_object (builder1, "button2");

  g_signal_connect (spin_int1, "value-changed", G_CALLBACK (get_new_number_int_integer1), NULL);

  g_signal_connect (spin_int1, "scroll-event", G_CALLBACK(gtk_true), NULL);



  drawing1 = gtk_builder_get_object (builder1, "drawing1");

  g_signal_connect (G_OBJECT (drawing1), "draw", G_CALLBACK (on_draw_event), NULL);



  button_hello = gtk_builder_get_object (builder1, "button_hello");

  g_signal_connect (button_hello, "clicked", G_CALLBACK (print_hello), NULL);

  g_signal_connect (button_hello, "scroll-event", G_CALLBACK(gtk_true), NULL);



  button_quit = gtk_builder_get_object (builder1, "quit");

  g_signal_connect (button_quit, "clicked", G_CALLBACK (gtk_main_quit), NULL);

  g_signal_connect (button_quit, "scroll-event", G_CALLBACK(gtk_true), NULL);



write_file2();

gtk_main ();

}



int main (int argc, char **argv)

{

  GtkApplication *app;

  int status;



  app = gtk_application_new ("com.hotmail.matthews.roger.dareawidthheight",

        G_APPLICATION_FLAGS_NONE);

  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);

  status = g_application_run (G_APPLICATION (app), argc, argv);

  g_object_unref (app);

  return status;

}



int write_file2()

{

 FILE* outfile_file2 = fopen("file2", "w");

 fprintf(outfile_file2,"float1, %f\ninteger1, %d\n", float1, integer1);

 fclose(outfile_file2);

return;

}



builder.ui------------------------------------------------------------------------------:

<?xml version="1.0" encoding="UTF-8"?>

<interface>

  <!-- interface-requires gtk+ 3.8 -->

<!--<template class="ExampleAppWindow" parent="GtkApplicationWindow">

    <property name="title" translatable="yes">Example Application</property> -->

  <object id="window" class="GtkWindow">

    <property name="visible">True</property>

    <property name="title">Roger's App</property>

    <property name="border-width">10</property>

    <property name="default-width">600</property>

    <property name="default-height">400</property>

    <child>

      <object id="notebook" class="GtkNotebook">

        <property name="visible">True</property>

        <property name="can_focus">True</property>

        <child>

          <object id="swin" class="GtkScrolledWindow">

            <property name="visible">True</property>

            <child>

              <object class="GtkLayout" id="layout1">

                <property name="visible">True</property>

                <property name="width">2000</property>

                <property name="height">2000</property>

                  <child>

                    <object class="GtkLabel" id="label1">

                      <property name="label">Label1</property>

                      <property name="visible">True</property>

                    </object>

                      <packing>

                      <property name="x">1</property>

                      <property name="y">1</property>

                      </packing>

                  </child>

                  <child>

                    <object id="button1" class="GtkSpinButton">

                      <property name="visible">True</property>

                      <property name="numeric">True</property>

                      <property name="snap-to-ticks">True</property>

                      <property name="value">53.1</property>

                      <property name="climb-rate">1</property>

                      <property name="digits">1</property>

                      <property name="adjustment">adjustment1</property>

                      <child>

                        <object id="adjustment1" class="GtkAdjustment">

                          <property name="upper">121.0</property>

                          <property name="lower">-10.0</property>

                          <property name="value">53.1</property>

                          <property name="step-increment">0.1</property>

                          <property name="page-increment">1</property>

                          <property name="page-size">1</property>

                        </object>

                      </child>

                    </object>

                    <packing>

                      <property name="x">1</property>

                      <property name="y">20</property>

                    </packing>

                  </child>

                  <child>

                    <object class="GtkLabel" id="label2">

                      <property name="label">Label2</property>

                      <property name="visible">True</property>

                    </object>

                      <packing>

                      <property name="x">120</property>

                      <property name="y">1</property>

                      </packing>

                  </child>

                  <child>

                    <object id="button2" class="GtkSpinButton">

                      <property name="visible">True</property>

                      <property name="numeric">True</property>

                      <property name="snap-to-ticks">True</property>

                      <property name="climb-rate">1</property>

                      <property name="digits">0</property>

                      <property name="adjustment">adjustment2</property>

                     <child>

                       <object id="adjustment2" class="GtkAdjustment">

                         <property name="upper">101</property>

                         <property name="lower">0</property>

                         <property name="value">53</property>

                         <property name="step-increment">1</property>

                         <property name="page-increment">1</property>

                         <property name="page-size">1</property>

                       </object>

                     </child>

                    </object>

                    <packing>

                      <property name="x">120</property>

                      <property name="y">20</property>

                    </packing>

                  </child>

              </object>

            </child>

          </object>

        </child>

        <child type="tab">

          <object class="GtkLabel" id="notebook_tab1">

            <property name="label">Tab1</property>

          </object>

        </child>

        <child>

          <object id="swin2" class="GtkScrolledWindow">

            <property name="visible">True</property>

              <child>

                <object class="GtkDrawingArea" id="drawing1">

                  <property name="visible">True</property>

                  <property name="width">4000</property>

                  <property name="height">1000</property>

                </object>

                  <packing>

                    <property name="left-attach">1</property>

                    <property name="top-attach">1</property>

                  </packing>

              </child>

          </object>

        </child>

        <child type="tab">

          <object class="GtkLabel" id="notebook_tab2">

            <property name="label">Tab2</property>

          </object>

        </child>

        <child>

          <object id="swin3" class="GtkScrolledWindow">

            <property name="visible">True</property>

            <child>

              <object class="GtkLayout" id="layout2">

                <property name="visible">True</property>

                <property name="width">2000</property>

                <property name="height">2000</property>

                <child>

                  <object id="button_hello" class="GtkButton">

                    <property name="visible">True</property>

                    <property name="label">Hello World</property>

                  </object>

                  <packing>

                    <property name="x">120</property>

                    <property name="y">20</property>

                  </packing>

                </child>

              </object>

            </child>

          </object>

        </child>

        <child type="tab">

          <object class="GtkLabel" id="notebook_tab3">

            <property name="label">Tab3</property>

          </object>

        </child>

        <child>

          <object id="quit" class="GtkButton">

            <property name="visible">True</property>

            <property name="label">Quit</property>

          </object>

          <packing>

          </packing>

        </child>

        <child type="tab">

          <object class="GtkLabel" id="notebook_tab4">

            <property name="label">Tab4</property>

          </object>

        </child>

      </object>

    </child>

  </object>

</interface>
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