Hi Phil,
You should be able to resize columns if you want. If you have set sizes of text
to display in the tree view and want to allocate sizes you can do that.
Eric
/*
Tested with Ubuntu16.04 and GTK3.18.
gcc -Wall tree_column1.c -o tree_column1 `pkg-config --cflags --libs
gtk+-3.0`
*/
#include<gtk/gtk.h>
static GtkTreeStore* get_tree_store();
static void set_column2_width(GtkComboBox *combo, GtkTreeViewColumn *column2);
int main(int argc, char *argv[])
{
gtk_init(&argc, &argv);
GtkWidget *window=gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_title(GTK_WINDOW(window), "Tree View");
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 400, 400);
g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
GtkTreeStore *store=get_tree_store();
GtkWidget *tree=gtk_tree_view_new_with_model(GTK_TREE_MODEL(store));
g_object_unref(G_OBJECT(store));
GtkCellRenderer *renderer1=gtk_cell_renderer_text_new();
g_object_set(renderer1, "editable", FALSE, NULL);
GtkTreeViewColumn
*column1=gtk_tree_view_column_new_with_attributes("Column1", renderer1, "text",
0, NULL);
gtk_tree_view_column_set_sizing(GTK_TREE_VIEW_COLUMN(column1),
GTK_TREE_VIEW_COLUMN_FIXED);
gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column1), 100);
GtkTreeViewColumn
*column2=gtk_tree_view_column_new_with_attributes("Column2", renderer1, "text",
1, NULL);
gtk_tree_view_column_set_sizing(GTK_TREE_VIEW_COLUMN(column2),
GTK_TREE_VIEW_COLUMN_FIXED);
gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column2), 25);
GtkTreeViewColumn
*column3=gtk_tree_view_column_new_with_attributes("Column3", renderer1, "text",
2, NULL);
gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column1);
gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column2);
gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column3);
GtkWidget *scroll=gtk_scrolled_window_new(NULL, NULL);
gtk_container_set_border_width(GTK_CONTAINER(scroll), 5);
gtk_widget_set_vexpand(scroll, TRUE);
gtk_widget_set_hexpand(scroll, TRUE);
gtk_container_add(GTK_CONTAINER(scroll), tree);
GtkWidget *combo=gtk_combo_box_text_new();
gtk_widget_set_hexpand(combo, TRUE);
gtk_combo_box_text_insert(GTK_COMBO_BOX_TEXT(combo), 0, "1", "Column2 width
25");
gtk_combo_box_text_insert(GTK_COMBO_BOX_TEXT(combo), 1, "2", "Column2 width
50");
gtk_combo_box_text_insert(GTK_COMBO_BOX_TEXT(combo), 2, "3", "Column2 width
100");
gtk_combo_box_text_insert(GTK_COMBO_BOX_TEXT(combo), 3, "4", "Column2 width
150");
gtk_combo_box_set_active(GTK_COMBO_BOX(combo), 0);
g_signal_connect(combo, "changed", G_CALLBACK(set_column2_width), column2);
GtkWidget *grid=gtk_grid_new();
gtk_container_set_border_width(GTK_CONTAINER(grid), 20);
gtk_grid_attach(GTK_GRID(grid), scroll, 0, 0, 1, 1);
gtk_grid_attach(GTK_GRID(grid), combo, 0, 1, 1, 1);
gtk_container_add(GTK_CONTAINER(window), grid);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
static GtkTreeStore* get_tree_store()
{
gint i=0;
GtkTreeStore *store=gtk_tree_store_new(3, G_TYPE_INT, G_TYPE_STRING,
G_TYPE_STRING);
GtkTreeIter iter1;
for(i=0;i<10;i++)
{
gchar *string1=g_strdup_printf("Name %i", i);
gtk_tree_store_append(store, &iter1, NULL);
gtk_tree_store_set(store, &iter1, 0, i, 1, string1, 2, string1, -1);
g_free(string1);
}
return store;
}
static void set_column2_width(GtkComboBox *combo, GtkTreeViewColumn *column2)
{
gint combo_id=gtk_combo_box_get_active(combo);
if(combo_id==0)
gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column2), 25);
else if(combo_id==1)
gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column2), 50);
else if(combo_id==2)
gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column2), 100);
else gtk_tree_view_column_set_fixed_width(GTK_TREE_VIEW_COLUMN(column2),
150);
}
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