From: Scott Worley <scottworley@scottworley.com>
Date: Thu, 23 Feb 2023 18:31:09 +0000 (-0800)
Subject: Keep the charts in State
X-Git-Url: http://git.scottworley.com/batteryviewer/commitdiff_plain/fc1a2773a0f61d12cd3ae3771c3afbfe7f255565

Keep the charts in State
---

diff --git a/batteryviewer.c b/batteryviewer.c
index 535ef74..a525a72 100644
--- a/batteryviewer.c
+++ b/batteryviewer.c
@@ -1,8 +1,12 @@
 #include "chart.h"
 #include <gtk/gtk.h>
 
-static void activate(GtkApplication *app,
-                     gpointer user_data __attribute__((unused))) {
+struct State {
+  BVChart *voltage;
+  BVChart *current;
+};
+
+static void activate(GtkApplication *app, gpointer user_data) {
 
   GtkWidget *window = gtk_application_window_new(app);
   gtk_window_set_title(GTK_WINDOW(window), "BatteryViewer");
@@ -11,28 +15,32 @@ static void activate(GtkApplication *app,
   GtkWidget *box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 1);
   gtk_container_add(GTK_CONTAINER(window), box);
 
-  GtkWidget *chart = bv_chart_new();
-  bv_chart_add_point(BV_CHART(chart), 0.0, 0.0);
-  bv_chart_add_point(BV_CHART(chart), 1.0, 1.0);
-  bv_chart_add_point(BV_CHART(chart), 3.0, 2.0);
+  struct State *state = (struct State *)user_data;
+  state->voltage = BV_CHART(bv_chart_new());
+  bv_chart_add_point(state->voltage, 0.0, 0.0);
+  bv_chart_add_point(state->voltage, 1.0, 1.0);
+  bv_chart_add_point(state->voltage, 3.0, 2.0);
   gboolean expand = TRUE;
   gboolean fill = TRUE;
   guint padding = 0;
-  gtk_box_pack_start(GTK_BOX(box), chart, expand, fill, padding);
+  gtk_box_pack_start(GTK_BOX(box), GTK_WIDGET(state->voltage), expand, fill,
+                     padding);
 
-  GtkWidget *chart2 = bv_chart_new();
-  bv_chart_add_point(BV_CHART(chart2), 0.0, 1.0);
-  bv_chart_add_point(BV_CHART(chart2), 1.0, 0.0);
-  gtk_box_pack_end(GTK_BOX(box), chart2, expand, fill, padding);
+  state->current = BV_CHART(bv_chart_new());
+  bv_chart_add_point(state->current, 0.0, 1.0);
+  bv_chart_add_point(state->current, 1.0, 0.0);
+  gtk_box_pack_end(GTK_BOX(box), GTK_WIDGET(state->current), expand, fill,
+                   padding);
 
   gtk_widget_show_all(window);
 }
 
 int main(int argc, char **argv) {
+  struct State state;
 
   GtkApplication *app = gtk_application_new("com.scottworley.batteryviewer",
                                             G_APPLICATION_DEFAULT_FLAGS);
-  g_signal_connect(app, "activate", G_CALLBACK(activate), NULL);
+  g_signal_connect(app, "activate", G_CALLBACK(activate), &state);
   int status = g_application_run(G_APPLICATION(app), argc, argv);
   g_object_unref(app);