[gtk/constraint-list-model: 2/4] constraint editor: Implement saving

[Matthias Clasen <matthiasc src gnome org>]

commit 9a5ea0a713b7040500a88ac696e5fd4604780145
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Jul 2 04:11:46 2019 +0000

    constraint editor: Implement saving
    
    Save to a ui file.

 demos/constraint-editor/constraint-editor-window.c | 60 ++++++++++++++++++++--
 demos/constraint-editor/constraint-editor.c        | 34 ++++++++++++
 demos/constraint-editor/constraint-editor.h        |  4 ++
 demos/constraint-editor/guide-editor.c             | 23 +++++++++
 demos/constraint-editor/guide-editor.h             |  4 ++
 5 files changed, 120 insertions(+), 5 deletions(-)
---
diff --git a/demos/constraint-editor/constraint-editor-window.c 
b/demos/constraint-editor/constraint-editor-window.c
index c6e4fa42e7..971450e5fa 100644
--- a/demos/constraint-editor/constraint-editor-window.c
+++ b/demos/constraint-editor/constraint-editor-window.c
@@ -102,6 +102,58 @@ open_cb (GtkWidget              *button,
   gtk_native_dialog_show (GTK_NATIVE_DIALOG (dialog));
 }
 
+static void
+serialize_child (GString   *str,
+                 int        indent,
+                 GtkWidget *child)
+{
+  const char *name;
+
+  name = gtk_widget_get_name (child);
+  g_string_append_printf (str, "%*s<child>\n", indent, "");
+  g_string_append_printf (str, "%*s  <object class=\"GtkLabel\" id=\"%s\">\n", indent, "", name);
+  g_string_append_printf (str, "%*s    <property name=\"label\">%s</property>\n", indent, "", name);
+  g_string_append_printf (str, "%*s  </object>\n", indent, "");
+  g_string_append_printf (str, "%*s</child>\n", indent, "");
+}
+
+static char *
+serialize_model (GListModel *list)
+{
+  GString *str = g_string_new ("");
+  int i;
+
+  g_string_append (str, "<interface>\n");
+  g_string_append (str, "  <object class=\"GtkBox\" id=\"view\">\n");
+  g_string_append (str, "    <property name=\"layout-manager\">\n");
+  g_string_append (str, "      <object class=\"GtkConstraintLayout\">\n");
+  g_string_append (str, "        <constraints>\n");
+  for (i = 0; i < g_list_model_get_n_items (list); i++)
+    {
+      gpointer item = g_list_model_get_item (list, i);
+      g_object_unref (item);
+      if (GTK_IS_CONSTRAINT (item))
+        constraint_editor_serialize_constraint (str, 10, GTK_CONSTRAINT (item));
+      else if (GTK_IS_CONSTRAINT_GUIDE (item))
+        guide_editor_serialize_guide (str, 10, GTK_CONSTRAINT_GUIDE (item));
+    }
+  g_string_append (str, "        </constraints>\n");
+  g_string_append (str, "      </object>\n");
+  g_string_append (str, "    </property>\n");
+  for (i = 0; i < g_list_model_get_n_items (list); i++)
+    {
+      gpointer item = g_list_model_get_item (list, i);
+      g_object_unref (item);
+      if (GTK_IS_WIDGET (item))
+        serialize_child (str, 4, GTK_WIDGET (item));
+    }
+  g_string_append (str, "  </object>\n");
+  g_string_append (str, "</interface>\n");
+
+  return g_string_free (str, FALSE);
+}
+
+
 static void
 save_response_cb (GtkNativeDialog        *dialog,
                   gint                    response,
@@ -111,14 +163,12 @@ save_response_cb (GtkNativeDialog        *dialog,
 
   if (response == GTK_RESPONSE_ACCEPT)
     {
+      GListModel *model;
       char *text, *filename;
       GError *error = NULL;
 
-#if 0
-      text = get_current_text (self->text_buffer);
-#else
-      text = "Sorry, Dave";
-#endif
+      model = constraint_view_get_model (CONSTRAINT_VIEW (self->view));
+      text = serialize_model (model);
 
       filename = gtk_file_chooser_get_filename (GTK_FILE_CHOOSER (dialog));
       if (!g_file_set_contents (filename, text, -1, &error))
diff --git a/demos/constraint-editor/constraint-editor.c b/demos/constraint-editor/constraint-editor.c
index e871b6a6c8..8346be7d42 100644
--- a/demos/constraint-editor/constraint-editor.c
+++ b/demos/constraint-editor/constraint-editor.c
@@ -236,6 +236,40 @@ get_strength_nick (GtkConstraintStrength strength)
   return nick;
 }
 
+void
+constraint_editor_serialize_constraint (GString       *str,
+                                        int            indent,
+                                        GtkConstraint *constraint)
+{
+  const char *target;
+  const char *target_attr;
+  const char *relation;
+  const char *source;
+  const char *source_attr;
+  double multiplier;
+  double constant;
+  const char *strength;
+
+  target = get_target_name (gtk_constraint_get_target (constraint));
+  target_attr = get_attr_nick (gtk_constraint_get_target_attribute (constraint));
+  relation = get_relation_nick (gtk_constraint_get_relation (constraint));
+  source = get_target_name (gtk_constraint_get_source (constraint));
+  source_attr = get_attr_nick (gtk_constraint_get_source_attribute (constraint));
+  multiplier = gtk_constraint_get_multiplier (constraint);
+  constant = gtk_constraint_get_constant (constraint);
+  strength = get_strength_nick (gtk_constraint_get_strength (constraint));
+
+  g_string_append_printf (str, "%*s<constraint target=\"%s\" target-attribute=\"%s\"\n", indent, "", target, 
target_attr);
+  g_string_append_printf (str, "%*s            relation=\"%s\"\n", indent, "", relation);
+  if (strcmp (source_attr, "none") != 0)
+    {
+      g_string_append_printf (str, "%*s            source=\"%s\" source-attribute=\"%s\"\n", indent, "", 
source, source_attr);
+      g_string_append_printf (str, "%*s            multiplier=\"%g\"\n", indent, "", multiplier);
+    }
+  g_string_append_printf (str, "%*s            constant=\"%g\"\n", indent, "", constant);
+  g_string_append_printf (str, "%*s            strength=\"%s\" />\n", indent, "", strength);
+}
+
 static void
 create_constraint (GtkButton        *button,
                    ConstraintEditor *editor)
diff --git a/demos/constraint-editor/constraint-editor.h b/demos/constraint-editor/constraint-editor.h
index c5940e254b..b2b5613856 100644
--- a/demos/constraint-editor/constraint-editor.h
+++ b/demos/constraint-editor/constraint-editor.h
@@ -27,3 +27,7 @@ G_DECLARE_FINAL_TYPE (ConstraintEditor, constraint_editor, CONSTRAINT, EDITOR, G
 
 ConstraintEditor * constraint_editor_new (GListModel    *model,
                                           GtkConstraint *constraint);
+
+void constraint_editor_serialize_constraint (GString       *str,
+                                             int            indent,
+                                             GtkConstraint *constraint);
diff --git a/demos/constraint-editor/guide-editor.c b/demos/constraint-editor/guide-editor.c
index 663697337c..a7ea6b5da0 100644
--- a/demos/constraint-editor/guide-editor.c
+++ b/demos/constraint-editor/guide-editor.c
@@ -89,6 +89,29 @@ get_strength_nick (GtkConstraintStrength strength)
   return nick;
 }
 
+void
+guide_editor_serialize_guide (GString *str,
+                              int      indent,
+                              GtkConstraintGuide *guide)
+{
+  int min_width, min_height;
+  int nat_width, nat_height;
+  int max_width, max_height;
+  const char *name;
+  const char *strength;
+
+  gtk_constraint_guide_get_min_size (guide, &min_width, &min_height);
+  gtk_constraint_guide_get_nat_size (guide, &nat_width, &nat_height);
+  gtk_constraint_guide_get_max_size (guide, &max_width, &max_height);
+  name = gtk_constraint_guide_get_name (guide);
+  strength = get_strength_nick (gtk_constraint_guide_get_strength (guide));
+
+  g_string_append_printf (str, "%*s<guide min-width=\"%d\" min-height=\"%d\"\n", indent, "", min_width, 
min_height);
+  g_string_append_printf (str, "%*s       nat-width=\"%d\" nat-height=\"%d\"\n", indent, "", nat_width, 
nat_height);
+  g_string_append_printf (str, "%*s       max-width=\"%d\" max-height=\"%d\"\n", indent, "", max_width, 
max_height);
+  g_string_append_printf (str, "%*s       name=\"%s\" strength=\"%s\" />\n", indent, "", name, strength);
+}
+
 static void
 create_guide (GtkButton   *button,
               GuideEditor *editor)
diff --git a/demos/constraint-editor/guide-editor.h b/demos/constraint-editor/guide-editor.h
index d11cb4f3db..56ccbfd5d3 100644
--- a/demos/constraint-editor/guide-editor.h
+++ b/demos/constraint-editor/guide-editor.h
@@ -26,3 +26,7 @@
 G_DECLARE_FINAL_TYPE (GuideEditor, guide_editor, GUIDE, EDITOR, GtkWidget)
 
 GuideEditor * guide_editor_new (GtkConstraintGuide  *guide);
+
+void guide_editor_serialize_guide (GString            *str,
+                                   int                 indent,
+                                   GtkConstraintGuide *guide);