Doubt about button_press_event and drag and drop

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To GTK Team,

 

    I am new into GTK programmer language and I´ve been develop one application that needs treeview to operate a SQL data base to linux and windows.

    I developed one interface with glade_3 to use gtk 2.12 for windows and mingw c compiler with a treeview that will control database. Inside treeview I need to use some GDKEVENTS that they are:

    Button press, button release,  button release (double click), Button release (right click) to call popup menu, and drag and drop operation to organize the structure.

 

    I´ve been worded hard this 2 last weeks to understand why drag and drop doesn´t work when I define button_press_event or button_release_event.

 

    I made some tests and I see when I don´t  define any button press or release  event drag and drop work fine but when I define them, drag and drop doesn´t  work.

    I read some tutorials that I looked for into internet and the documentation of GTK, GDK, GLIB and see something about drag and drop that explain drag starts with button_press and drop ends with button releases but my doubt go on yet. Main question is:

 

    Is it possible to use button_press ou release events with drag and drop with high level api?

 

    If not,  do I need to detect this events separately? And manually (low level api) starts drag and drop with combination between button_press_event and motion_event?

 

    I will appreciate yours help.

   

    Ubirajara Marques da Cruz

    

    Email: biracruz@xxxxxxxxxxxx

 

To make glade interface i used a window with a treeview only.

 

Program is below

 

#include <gtk/gtk.h>

#include <gdk/gdk.h>

#include <glib.h>

#include <glade/glade.h>

#include <stdio.h>

 

GladeXML *xml;

GtkWidget *varwid;

GtkCellRenderer *renderer;

GtkTreeModel  *model;

GtkTreeStore *store;

GtkTreeIter iter, child, iaux;

GtkTreeViewColumn *coluna;

GtkTreePath *path;

gint i;

 

enum

{

COL_NAME = 0,

COL_AGE,

COL_TESTE,

NUM_COLS,

COLOR_COLUMN

};

void sair(void)

{

      gtk_main_quit();

}

static void messbox(gchar *mensagem)

{

 GtkWidget *dialogo;

 if (mensagem=="")

    mensagem="VAZIO";

 varwid==glade_xml_get_widget(xml,"window");

 dialogo = gtk_message_dialog_new (GTK_WINDOW (varwid),

                           GTK_DIALOG_MODAL /*| GTK_DIALOG_DESTROY_WITH_PARENT*/,

                           GTK_MESSAGE_INFO,

                           GTK_BUTTONS_OK,

                           mensagem);

  gtk_dialog_run (GTK_DIALOG (dialogo));

  gtk_widget_destroy (dialogo);

};

void tv1_release(GtkWidget *tv, GdkEventButton *evento, gpointer usdata)

      {

      if (gtk_tree_view_get_path_at_pos(GTK_TREE_VIEW(tv),evento->x,evento->y,&path,NULL,NULL,NULL))

            gtk_tree_view_set_cursor(GTK_TREE_VIEW(tv),path,coluna,0);

      else

            messbox("path doesn't exist");

      if(evento->button==3 && evento->type==GDK_BUTTON_RELEASE)

            {

            g_print("Left Click!\n");

            }

      if (evento->button==1 && evento->type==GDK_BUTTON_RELEASE)

            {

            g_print("Right Click!\n");

            }

      };

int main (int argc, char **argv)

{

      gtk_init(&argc,&argv);

      glade_init();

      xml = glade_xml_new("treeview.glade","window",NULL);

      varwid=glade_xml_get_widget(xml,"view");

      renderer = gtk_cell_renderer_text_new();

      varwid=glade_xml_get_widget(xml,"view");

      coluna = gtk_tree_view_column_new_with_attributes("Linha",renderer,"text",COL_NAME,"editable",

                  TRUE,"editable-set",TRUE, NULL);

      gtk_tree_view_append_column(GTK_TREE_VIEW(varwid),coluna);

      coluna = gtk_tree_view_column_new_with_attributes("Idade",renderer,"text",COL_AGE, NULL);

      gtk_tree_view_append_column(GTK_TREE_VIEW(varwid),coluna);

      coluna = gtk_tree_view_column_new_with_attributes("Teste",renderer,"text",COL_TESTE,NULL);

      gtk_tree_view_append_column(GTK_TREE_VIEW(varwid),coluna);

      gtk_tree_view_set_grid_lines        (GTK_TREE_VIEW (varwid),

            GTK_TREE_VIEW_GRID_LINES_BOTH);

    store = gtk_tree_store_new (NUM_COLS ,G_TYPE_STRING,G_TYPE_ULONG,G_TYPE_STRING);

    model=GTK_TREE_MODEL(store);

    gtk_tree_view_set_model(GTK_TREE_VIEW(varwid), model);

    gchar *a,buf[5],*pth;

    a="1";

    gdouble c[15];

    /*

     * To fill tree view i assembly an array that show parents and child to understant

     * tree. if you see 0 is first level 1 is second level and so on.

     */

    c[0]=0 ;c[1]=1 ;c[2]=2 ;c[3]=3 ;c[4]=3 ;c[5]=2 ;c[6]=2 ;c[7]=3 ;c[8]=3 ;c[9]=4 ;

    c[10]=0 ;c[11]=1 ;c[12]=0 ;c[13]=0 ;c[14]=1 ;c[15]=0 ;

    gtk_tree_store_append(store,&iter,NULL);

    a=g_ascii_dtostr(buf,2,c[0]);

    pth=gtk_tree_model_get_string_from_iter(model,&iter);

    gtk_tree_store_set(store,&iter,COL_NAME,a,COL_AGE,0,COL_TESTE,pth,-1);

    iaux=iter;

    gint i,k;

    for (i=1;i<16;i++)

    {

    if (c[i]-c[i-1]>0) //son

            {

      gtk_tree_store_append(store,&child,&iaux);

      a=g_ascii_dtostr(buf,2,c[i]);

      pth=gtk_tree_model_get_string_from_iter(model,&child);

      gtk_tree_store_set(store,&child,COL_NAME,a,COL_AGE,i,COL_TESTE,pth,-1);

      iaux=child;

            }

    else

            {

      if (c[i]-c[i-1]==0) //brother

                  {

            if (gtk_tree_model_iter_parent(model,&iaux,&child)) //brother with father

                        {

                  gtk_tree_store_append(store,&child,&iaux);

                  a=g_ascii_dtostr(buf,2,c[i]);

                  pth=gtk_tree_model_get_string_from_iter(model,&child);

                  gtk_tree_store_set(store,&child,COL_NAME,a,COL_AGE,i,COL_TESTE,pth,-1);

                  iaux=child;

                        }

            else

                        {     //brother without father

                  iaux=child;

                  if(gtk_tree_store_iter_depth(store,&iaux)==0)

                             {

                        gtk_tree_store_append(store,&child,NULL);

                        a=g_ascii_dtostr(buf,2,c[i]);

                        pth=gtk_tree_model_get_string_from_iter(model,&child);

                        gtk_tree_store_set(store,&child,COL_NAME,a,COL_AGE,i,COL_TESTE,pth,-1);

                        iaux=child;

                             }

                        }

                  }

      else

                  {     //Level grand father

            k=c[i-1]-c[i];

            while (k>0)

                        {

                  if (gtk_tree_model_iter_parent(model,&iaux,&child)==1)

                             {

                        k=k-1;

                        child=iaux;

                             }

                  else

                        iaux=child;

                        } //end while

            if (gtk_tree_model_iter_parent(model,&iaux,&child)==1) //brother with father

                  {

                  gtk_tree_store_append(store,&child,&iaux);

                a=g_ascii_dtostr(buf,2,c[i]);

                pth=gtk_tree_model_get_string_from_iter(model,&child);

                gtk_tree_store_set(store,&child,COL_NAME,a,COL_AGE,i,COL_TESTE,pth,-1);

                iaux=child;

                  }

            else

                        {     //brother without father

                  iaux=child;

                if(gtk_tree_store_iter_depth(store,&iaux)==0)

                  {

                  gtk_tree_store_append(store,&child,NULL);

                  a=g_ascii_dtostr(buf,2,c[i]);

                  pth=gtk_tree_model_get_string_from_iter(model,&child);

                  gtk_tree_store_set(store,&child,COL_NAME,a,COL_AGE,i,COL_TESTE,pth,-1);

                  iaux=child;

                  }

                  }

                  } //end 2nd if

            }//end 1st if

 

    }// end for

    g_object_unref(model);

      glade_xml_signal_connect(xml,"tv1_release",G_CALLBACK(tv1_release));

      varwid=glade_xml_get_widget(xml,"window");

      gtk_widget_show_all (varwid);

      gtk_main();

    return 0;

}

 

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