[gtk/matthiasc/lottie2: 6/8] Add an interactive path test

[Matthias Clasen <matthiasc src gnome org>]

commit db92023e4ff231f7de3ec381f1d1f9f5b280f3f9
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 24 14:24:40 2020 -0500

    Add an interactive path test
    
    This one is for interactive exploring of svg paths.
    
    You can enter an SVG path in the entry and hit Enter
    to see how GSK renders it.

 tests/curve2.c    | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/meson.build |   1 +
 2 files changed, 152 insertions(+)
---
diff --git a/tests/curve2.c b/tests/curve2.c
new file mode 100644
index 0000000000..0f594d597f
--- /dev/null
+++ b/tests/curve2.c
@@ -0,0 +1,151 @@
+#include <gtk/gtk.h>
+
+#define DEMO_TYPE_WIDGET (demo_widget_get_type ())
+G_DECLARE_FINAL_TYPE (DemoWidget, demo_widget, DEMO, WIDGET, GtkWidget)
+
+struct _DemoWidget
+{
+  GtkWidget parent_instance;
+  GskPath *path;
+};
+
+struct _DemoWidgetClass
+{
+  GtkWidgetClass parent_class;
+};
+
+G_DEFINE_TYPE (DemoWidget, demo_widget, GTK_TYPE_WIDGET)
+
+static void
+demo_widget_init (DemoWidget *self)
+{
+}
+
+static void
+demo_widget_snapshot (GtkWidget   *widget,
+                      GtkSnapshot *snapshot)
+{
+  DemoWidget *self = DEMO_WIDGET (widget);
+  int width, height;
+  GskStroke *stroke;
+
+  if (!self->path)
+    return;
+
+  width = gtk_widget_get_width (widget);
+  height = gtk_widget_get_width (widget);
+
+  stroke = gsk_stroke_new (1.0);
+  gtk_snapshot_push_stroke (snapshot, self->path, stroke);
+  gsk_stroke_free (stroke);
+
+  gtk_snapshot_append_color (snapshot,
+                             &(GdkRGBA){ 0, 0, 0, 1},
+                             &GRAPHENE_RECT_INIT (0, 0, width, height ));
+
+  gtk_snapshot_pop (snapshot);
+}
+
+static void
+demo_widget_dispose (GObject *object)
+{
+  DemoWidget *self = DEMO_WIDGET (object);
+
+  g_clear_pointer (&self->path, gsk_path_unref);
+
+  G_OBJECT_CLASS (demo_widget_parent_class)->dispose (object);
+}
+
+static void
+demo_widget_class_init (DemoWidgetClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+  GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
+
+  object_class->dispose = demo_widget_dispose;
+
+  widget_class->snapshot = demo_widget_snapshot;
+}
+
+static GtkWidget *
+demo_widget_new (void)
+{
+  return g_object_new (DEMO_TYPE_WIDGET, NULL);
+}
+
+static void
+demo_widget_set_path (DemoWidget *self,
+                      GskPath    *path)
+{
+  g_clear_pointer (&self->path, gsk_path_unref);
+  self->path = gsk_path_ref (path);
+  gtk_widget_queue_draw (GTK_WIDGET (self));
+}
+
+static void
+activate (GtkEntry *entry,
+          DemoWidget *demo)
+{
+  GskPath *path;
+
+  path = gsk_path_new_from_string (gtk_editable_get_text (GTK_EDITABLE (entry)));
+  if (path)
+    {
+      demo_widget_set_path (demo, path);
+      gsk_path_unref (path);
+    }
+}
+
+static void
+init_demo (DemoWidget  *demo,
+           GtkEditable *editable)
+{
+  GskPathBuilder *builder;
+  GskPath *path;
+  char *string;
+
+  builder = gsk_path_builder_new ();
+  gsk_path_builder_add_circle (builder, &GRAPHENE_POINT_INIT (150, 150), 100);
+  gsk_path_builder_add_rect (builder, 100, 100, 100, 100);
+  path = gsk_path_builder_free_to_path (builder);
+
+  demo_widget_set_path (demo, path);
+
+  string = gsk_path_to_string (path);
+  gtk_editable_set_text (editable, string);
+  g_free (string);
+  gsk_path_unref (path);
+}
+
+int
+main (int argc, char *argv[])
+{
+  GtkWidget *window, *box, *demo, *entry;
+
+  gtk_init ();
+
+  window = gtk_window_new ();
+  gtk_window_set_default_size (GTK_WINDOW (window), 600, 400);
+  box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+  gtk_window_set_child (GTK_WINDOW (window), box);
+
+  demo = demo_widget_new ();
+
+  gtk_widget_set_hexpand (demo, TRUE);
+  gtk_widget_set_vexpand (demo, TRUE);
+  gtk_box_append (GTK_BOX (box), demo);
+
+  entry = gtk_entry_new ();
+  g_signal_connect (entry, "activate", G_CALLBACK (activate), demo);
+
+  init_demo (DEMO_WIDGET (demo), GTK_EDITABLE (entry));
+
+  gtk_box_append (GTK_BOX (box), entry);
+
+  gtk_window_present (GTK_WINDOW (window));
+
+  while (g_list_model_get_n_items (gtk_window_get_toplevels ()) > 0)
+    g_main_context_iteration (NULL, TRUE);
+
+  return 0;
+}
diff --git a/tests/meson.build b/tests/meson.build
index 99f95009f0..42c492b67f 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -1,5 +1,6 @@
 gtk_tests = [
   # testname, optional extra sources
+  ['curve2'],
   ['testupload'],
   ['testtransform'],
   ['testdropdown'],