Re: TreeView - set border on individual cells

[cecashon aol com]

Hi Mike,

I gave what you said a try and it looks to work well enough. Then, how do you get a box around a selected 
cell. It seems to me if you let the built in renderer do it's thing and then get a cairo_t to just draw a 
rectangle after, it should work, right? OK, a bit of a hack but it works on my computer. GTK3.18. On a newer 
version of GTK I get a deprecated warning about gdk_cairo_create() but it still works.

Eric
   
//gcc -Wall stripe_list2.c -o stripe_list2 `pkg-config --cflags --libs gtk+-3.0`

#include<gtk/gtk.h>
#include<stdlib.h>

enum
{
   ID,
   PROGRAM,
   COLOR,
   COLOR2,
   COLUMNS
};

static gint row_g=0;
static gint column_g=0;

static void get_path(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer renderer1)
  {
    g_print("Get Path\n");
    gchar *string=gtk_tree_path_to_string(path);
    g_print("%s %s\n", string, gtk_tree_view_column_get_title(column));
    row_g=atoi(string);
    g_free(string);

    gint c1=0;
    if(g_strcmp0("ID", gtk_tree_view_column_get_title(column))==0) c1=2;
    if(g_strcmp0("Program", gtk_tree_view_column_get_title(column))==0) c1=3;
    column_g=c1-2;

    GtkTreeIter iter;
    GtkTreeModel *tree_model=gtk_tree_view_get_model(tree_view);
    gtk_tree_model_get_iter(tree_model, &iter, path);
    gtk_list_store_set(GTK_LIST_STORE(tree_model), &iter, c1, "SpringGreen", -1);
    gtk_widget_queue_draw(GTK_WIDGET(tree_view));
  }
static gboolean draw_rectangle(GtkWidget *tree_view, cairo_t *cr, gpointer data)
  {
    GtkTreePath *path=gtk_tree_path_new_from_indices(row_g, -1);

    g_print("Draw Rectangle %i %i\n", row_g, column_g);
    GdkWindow *win=gtk_tree_view_get_bin_window(GTK_TREE_VIEW(tree_view));
    cairo_t *cr2=gdk_cairo_create(win);
    GdkRectangle rect;
    cairo_set_line_width(cr2, 4.0);
    cairo_set_source_rgba(cr2, 1.0, 1.0, 1.0, 1.0);
    GtkTreeViewColumn *column=gtk_tree_view_get_column(GTK_TREE_VIEW(tree_view), column_g);
    gtk_tree_view_get_cell_area(GTK_TREE_VIEW(tree_view), path, column, &rect);
    cairo_rectangle(cr2, rect.x+2, rect.y+2, rect.width-2, rect.height-2);
    cairo_stroke(cr2);
     
    cairo_destroy(cr2);   
    gtk_tree_path_free(path);

    return TRUE;
  }
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), "Stripes");
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
    gtk_window_set_default_size(GTK_WINDOW(window), 300, 300);
    gtk_widget_set_name(window, "main_window");
    g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);

    GtkTreeIter iter;
    GtkListStore *store=gtk_list_store_new(COLUMNS, G_TYPE_UINT, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, ID, 0, PROGRAM, "Gedit", COLOR, "cyan", COLOR2, "chartreuse", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, ID, 1, PROGRAM, "Gimp", COLOR,  "yellow", COLOR2, "chartreuse", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, ID, 2, PROGRAM, "Inkscape", COLOR, "cyan", COLOR2, "chartreuse", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, ID, 3, PROGRAM, "Firefox", COLOR, "yellow", COLOR2, "fuchsia", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, ID, 4, PROGRAM, "Calculator", COLOR, "cyan", COLOR2, "chartreuse", -1);
    gtk_list_store_append(store, &iter);
    gtk_list_store_set(store, &iter, ID, 5, PROGRAM, "Devhelp", COLOR, "yellow", COLOR2, "chartreuse", -1);

    GtkWidget *tree=gtk_tree_view_new_with_model(GTK_TREE_MODEL(store));
    gtk_widget_set_name(tree, "test_tree");
    gtk_widget_set_hexpand(tree, TRUE);
    gtk_widget_set_vexpand(tree, FALSE);
    g_object_set(tree, "activate-on-single-click", TRUE, NULL);
    g_signal_connect_after(tree, "draw", G_CALLBACK(draw_rectangle), NULL);

    GtkTreeSelection *selection=gtk_tree_view_get_selection(GTK_TREE_VIEW(tree));
    gtk_tree_selection_set_mode(selection, GTK_SELECTION_NONE);

    GtkCellRenderer *renderer1=gtk_cell_renderer_text_new();
    g_object_set(renderer1, "editable", FALSE, NULL);

    g_signal_connect(tree, "row-activated", G_CALLBACK(get_path), renderer1);
   
    //Bind the COLOR column to the "cell-background" property.
    GtkTreeViewColumn *column1 = gtk_tree_view_column_new_with_attributes("ID", renderer1, "text", ID, 
"cell-background", COLOR, NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column1);    
    GtkTreeViewColumn *column2 = gtk_tree_view_column_new_with_attributes("Program", renderer1, "text", 
PROGRAM, "cell-background", COLOR2, NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(tree), column2);

    GtkWidget *label=gtk_label_new("Test Label");
    gtk_widget_set_name(label, "test_label");
    gtk_widget_set_hexpand(label, TRUE);
   
    GtkWidget *grid=gtk_grid_new();
    gtk_grid_set_row_homogeneous(GTK_GRID(grid), TRUE);
    gtk_widget_set_name(grid, "test_grid");
    gtk_grid_attach(GTK_GRID(grid), tree, 0, 0, 1, 9);
    gtk_grid_attach(GTK_GRID(grid), label, 0, 10, 1, 1);

    gtk_container_add(GTK_CONTAINER(window), grid);
   
    gtk_widget_show_all(window);

    gtk_main();    return 0;   
  }