Add paging of large data files

Loading a large (100,000+ entry) data file can take a very long
time, and is quite annoying to wait for. This patch breaks the
data up into pages (10,000 rows per page). Then it lets the user
move about the pages with a scroll button.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 70 insertions, 2 deletions

diff --git a/trace-view.c b/trace-view.c
index ac71c7c..555f1aa 100644
--- a/trace-view.c
+++ b/trace-view.c
@@ -80,6 +80,44 @@ cpus_clicked (gpointer data)
         trace_filter_cpu_dialog(trace_tree);
 }
 
+#if 0
+static GtkTreeModel *
+create_combo_box_model(void)
+{
+        GtkListStore *store;
+        GtkTreeIter iter;
+
+        store = gtk_list_store_new(1, G_TYPE_STRING);
+        gtk_list_store_append(store, &iter);
+        gtk_list_store_set(store, &iter, 0, "1", -1);
+
+        return GTK_TREE_MODEL(store);
+}
+#endif
+
+static void
+spin_changed(gpointer data, GtkWidget *spin)
+{
+        GtkTreeView *tree = data;
+        GtkTreeModel *model;
+        gint val, page;
+
+        val = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(spin));
+
+        model = gtk_tree_view_get_model(tree);
+        page = trace_view_store_get_page(TRACE_VIEW_STORE(model));
+        if (page == val)
+                return;
+
+        g_object_ref(model);
+        gtk_tree_view_set_model(tree, NULL);
+
+        trace_view_store_set_page(TRACE_VIEW_STORE(model), val);
+
+        gtk_tree_view_set_model(tree, model);
+        g_object_unref(model);
+}
+
 static GtkTreeModel *
 create_trace_view_model(struct tracecmd_input *handle)
 {
@@ -91,7 +129,8 @@ create_trace_view_model(struct tracecmd_input *handle)
 }
 
 static void
-load_trace_view(GtkWidget *view, struct tracecmd_input *handle)
+load_trace_view(GtkWidget *view, struct tracecmd_input *handle,
+                GtkWidget *spin)
 {
         GtkTreeViewColumn *col;
         GtkCellRenderer *renderer;
@@ -155,6 +194,9 @@ load_trace_view(GtkWidget *view, struct tracecmd_input *handle)
 
         model = create_trace_view_model(handle);
 
+        trace_view_store_set_spin_button(TRACE_VIEW_STORE(model), spin);
+        g_object_unref(spin);
+
         gtk_tree_view_set_model(GTK_TREE_VIEW(view), model);
 
         g_object_unref(model); /* destroy model automatically with view */
@@ -171,6 +213,8 @@ void trace_view(int argc, char **argv)
         GtkWidget *menu_item;
         GtkWidget *sub_item;
         GtkWidget *scrollwin;
+        GtkWidget *label;
+        GtkWidget *spin;
 
         handle = read_trace_header();
         if (!handle)
@@ -279,6 +323,29 @@ void trace_view(int argc, char **argv)
         /* --- End Filter Options --- */
         gtk_menu_item_set_submenu(GTK_MENU_ITEM (menu_item), menu);
 
+
+        /* --- Paging Hbox --- */
+
+        hbox = gtk_hbox_new(FALSE, 0);
+        gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
+        gtk_widget_show(hbox);
+
+        /* --- Page Spin Button --- */
+
+        label = gtk_label_new("Page");
+        gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);
+        gtk_widget_show(label);
+
+        spin = gtk_spin_button_new(NULL, 1.0, 0);
+        gtk_spin_button_set_range(GTK_SPIN_BUTTON(spin), 1, 1);
+        gtk_box_pack_start(GTK_BOX(hbox), spin, FALSE, FALSE, 0);
+        gtk_widget_show(spin);
+
+        g_signal_connect_swapped (G_OBJECT (spin), "value-changed",
+                                  G_CALLBACK (spin_changed),
+                                  (gpointer) trace_tree);
+
+
         /* --- Top Level Hbox --- */
 
         hbox = gtk_hbox_new(FALSE, 0);
@@ -295,7 +362,8 @@ void trace_view(int argc, char **argv)
 
         /* --- Set up Trace Tree --- */
 
-        load_trace_view(trace_tree, handle);
+        load_trace_view(trace_tree, handle, spin);
+
         gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(scrollwin),
                                               trace_tree);
         gtk_widget_show(trace_tree);