Re: Visual Keyboard

[Emmanuel Gontcho <gontcho gmail com>]

My problem was to be able to insert the on-screen keyboard on a Window of my application. No it to be a floating window. I joined source code of the keyboard. When building a new keyboard, pass it a GtkLabel or a GtkEntry as parameter and from it, you'll be able to retreive your text.

2010/11/25 Piñeiro <apinheiro igalia com>

From: Emmanuel Gontcho <gontcho gmail com>

> Thank you all for your answer,
>
> I have never tried before to write a widget from scratch, nor now,
> cause I have no time, the software must work before 15th december. So
> quickly I made what you can see in the attachment, using one or two
> functions, GtkTable and buttons, I think it is enough for the
> begining.

As it seems that you are creating a widget for your specific project,
I think that it is worth to comment that there are already some
projects that are creating a keyboard on-screen like Caribou [1]
or Onboard.

[1] http://live.gnome.org/Caribou
===
API (apinheiro igalia com)

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   /**********************************************************************
    *This program is free software: you can redistribute it and/or modify *
    *it under the terms of the GNU General Public License as published by *
    *the Free Software Foundation, either version 3 of the License, or    *
    *(at your option) any later version.                                  *
    *                                                                     *
    *This program is distributed in the hope that it will be useful,      *
    *but WITHOUT ANY WARRANTY; without even the implied warranty of       *
    *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
    *GNU General Public License for more details.                         *
    *                                                                     *
    *You should have received a copy of the GNU General Public License    *
    *along with this program.  If not, see <http://www.gnu.org/licenses/>.*
    ***********************************************************************/
#include <stdlib.h>
#include <string.h>
#include <gtk/gtk.h>
#include "keyboard.h"

void touch_clicked (GtkWidget *button, GtkWidget *label)
{
  char *buffer = NULL;
  char *labeltext = NULL;
  char *buttontext = NULL;

  buttontext = (char *) gtk_button_get_label (GTK_BUTTON (button));

  if (GTK_IS_LABEL (label) == TRUE)
    labeltext = (char *) gtk_label_get_text (GTK_LABEL (label));
  if ( GTK_IS_ENTRY (label) == TRUE)
    labeltext = (char *) gtk_entry_get_text (GTK_ENTRY (label));

  if (strcmp (buttontext, "BSP") == 0)
  {
    int size;
    size = sizeof (char) * strlen (labeltext);
    if (size < 1) return;
    buffer = malloc (size);
    strncpy (buffer, labeltext, size);
    strncpy (buffer + (strlen (labeltext) - 1), "\0", 1);
  }
  else if (strcmp (buttontext, "ESP") == 0)
  {
    asprintf (&buffer, "%s%s", labeltext ? labeltext : "", " ");
  }
  else if (strcmp (buttontext, "DEL") == 0)
  {
    asprintf (&buffer, "%s", "");
  }
  else
  {
    asprintf (&buffer, "%s%s", labeltext ? labeltext : "", buttontext);
  }

  if (GTK_IS_LABEL (label) == TRUE)
    gtk_label_set_text (GTK_LABEL (label), buffer);
  if ( GTK_IS_ENTRY (label) == TRUE)
    gtk_entry_set_text (GTK_ENTRY (label), buffer);
}

GtkWidget *new_keyboard (GtkWidget *label)
{
  GtkWidget *board;
  GtkWidget *touch;
  int i, j, k;
  char *lab;

  printf ("abount to launch building table\n");
  board = gtk_table_new (3, 9, FALSE);
  k = 65;
  for (i = 0; i < 4; i++)
  {
    for (j = 0; j < 9; j++)
    {
      printf ("about to asprint %c\n", k);
      asprintf (&lab, "%c", k++);
      touch = gtk_button_new_with_label (k == 92 ? "ESP" : k == 93 ? "BSP" : k == 94 ? "DEL" : lab);
      gtk_widget_set_size_request (touch, 50, 50);
      gtk_table_attach (GTK_TABLE (board), touch, j, j+1, i, i+1, GTK_FILL, GTK_FILL, 2, 2);
      g_signal_connect (G_OBJECT (touch), "clicked", G_CALLBACK (touch_clicked), label);
      if (k == 94) break;
    }
    if (k == 94) break;
  }
  return board;
}

    /**********************************************************************
    *This program is free software: you can redistribute it and/or modify *
    *it under the terms of the GNU General Public License as published by *
    *the Free Software Foundation, either version 3 of the License, or    *
    *(at your option) any later version.                                  *
    *                                                                     *
    *This program is distributed in the hope that it will be useful,      *
    *but WITHOUT ANY WARRANTY; without even the implied warranty of       *
    *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
    *GNU General Public License for more details.                         *
    *                                                                     *
    *You should have received a copy of the GNU General Public License    *
    *along with this program.  If not, see <http://www.gnu.org/licenses/>.*
    ***********************************************************************/

#ifndef KEYBOARD_H_INCLUDED
#define KEYBOARD_H_INCLUDED
#include <gtk/gtk.h>

GtkWidget *new_keyboard (GtkWidget *label);


#endif // KEYBOARD_H_INCLUDED