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[gtk/constraint-list-model: 5/7] constraint editor: Implement saving

commit ad9863cb940d87ae691cf77c460dded271ad83fa
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Jul 1 18:39:36 2019 +0000

    constraint editor: Implement saving
    
    Save to a ui file.

 .../constraint-editor-application.c                |  21 +++
 demos/constraint-editor/constraint-editor-window.c | 147 +++++++++++++++++++++
 .../constraint-editor/constraint-editor-window.ui  |  14 ++
 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 +
 7 files changed, 247 insertions(+)
---
diff --git a/demos/constraint-editor/constraint-editor-application.c 
b/demos/constraint-editor/constraint-editor-application.c
index 09b5d64270..aa130d9c13 100644
--- a/demos/constraint-editor/constraint-editor-application.c
+++ b/demos/constraint-editor/constraint-editor-application.c
@@ -51,6 +51,7 @@ static void
 constraint_editor_application_startup (GApplication *app)
 {
   const char *quit_accels[2] = { "<Ctrl>Q", NULL };
+  const char *open_accels[2] = { "<Ctrl>O", NULL };
   GtkCssProvider *provider;
 
   G_APPLICATION_CLASS (constraint_editor_application_parent_class)->startup (app);
@@ -59,6 +60,7 @@ constraint_editor_application_startup (GApplication *app)
                                    app_entries, G_N_ELEMENTS (app_entries),
                                    app);
   gtk_application_set_accels_for_action (GTK_APPLICATION (app), "app.quit", quit_accels);
+  gtk_application_set_accels_for_action (GTK_APPLICATION (app), "win.open", open_accels);
 
   provider = gtk_css_provider_new ();
   gtk_css_provider_load_from_resource (provider, "/org/gtk/gtk4/constraint-editor/constraint-editor.css");
@@ -76,6 +78,23 @@ constraint_editor_application_activate (GApplication *app)
   gtk_window_present (GTK_WINDOW (win));
 }
 
+static void
+constraint_editor_application_open (GApplication  *app,
+                                    GFile        **files,
+                                    gint           n_files,
+                                    const gchar   *hint)
+{
+  ConstraintEditorWindow *win;
+  gint i;
+
+  for (i = 0; i < n_files; i++)
+    {
+      win = constraint_editor_window_new (CONSTRAINT_EDITOR_APPLICATION (app));
+      constraint_editor_window_load (win, files[i]);
+      gtk_window_present (GTK_WINDOW (win));
+    }
+}
+
 static void
 constraint_editor_application_class_init (ConstraintEditorApplicationClass *class)
 {
@@ -83,6 +102,7 @@ constraint_editor_application_class_init (ConstraintEditorApplicationClass *clas
 
   application_class->startup = constraint_editor_application_startup;
   application_class->activate = constraint_editor_application_activate;
+  application_class->open = constraint_editor_application_open;
 }
 
 ConstraintEditorApplication *
@@ -90,5 +110,6 @@ constraint_editor_application_new (void)
 {
   return g_object_new (CONSTRAINT_EDITOR_APPLICATION_TYPE,
                        "application-id", "org.gtk.gtk4.ConstraintEditor",
+                       "flags", G_APPLICATION_HANDLES_OPEN,
                        NULL);
 }
diff --git a/demos/constraint-editor/constraint-editor-window.c 
b/demos/constraint-editor/constraint-editor-window.c
index bd9fd3e171..971450e5fa 100644
--- a/demos/constraint-editor/constraint-editor-window.c
+++ b/demos/constraint-editor/constraint-editor-window.c
@@ -65,6 +65,151 @@ constraint_editor_window_load (ConstraintEditorWindow *self,
   return TRUE;
 }
 
+static void
+open_response_cb (GtkNativeDialog        *dialog,
+                  gint                    response,
+                  ConstraintEditorWindow *self)
+{
+  gtk_native_dialog_hide (dialog);
+
+  if (response == GTK_RESPONSE_ACCEPT)
+    {
+      GFile *file;
+
+      file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (dialog));
+      constraint_editor_window_load (self, file);
+      g_object_unref (file);
+    }
+
+  gtk_native_dialog_destroy (dialog);
+}
+
+static void
+open_cb (GtkWidget              *button,
+         ConstraintEditorWindow *self)
+{
+  GtkFileChooserNative *dialog;
+
+  dialog = gtk_file_chooser_native_new ("Open file",
+                                        GTK_WINDOW (self),
+                                        GTK_FILE_CHOOSER_ACTION_OPEN,
+                                        "_Load",
+                                        "_Cancel");
+
+  gtk_native_dialog_set_modal (GTK_NATIVE_DIALOG (dialog), TRUE);
+  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), ".");
+  g_signal_connect (dialog, "response", G_CALLBACK (open_response_cb), self);
+  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,
+                  ConstraintEditorWindow *self)
+{
+  gtk_native_dialog_hide (dialog);
+
+  if (response == GTK_RESPONSE_ACCEPT)
+    {
+      GListModel *model;
+      char *text, *filename;
+      GError *error = NULL;
+
+      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))
+        {
+          GtkWidget *dialog;
+
+          dialog = gtk_message_dialog_new (GTK_WINDOW (gtk_widget_get_root (GTK_WIDGET (self))),
+                                           GTK_DIALOG_MODAL|GTK_DIALOG_DESTROY_WITH_PARENT,
+                                           GTK_MESSAGE_INFO,
+                                           GTK_BUTTONS_OK,
+                                           "Saving failed");
+          gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (dialog),
+                                                    "%s", error->message);
+          g_signal_connect (dialog, "response", G_CALLBACK (gtk_widget_destroy), NULL);
+          gtk_widget_show (dialog);
+          g_error_free (error);
+        }
+      g_free (filename);
+    }
+
+  gtk_native_dialog_destroy (dialog);
+}
+
+static void
+save_cb (GtkWidget              *button,
+         ConstraintEditorWindow *self)
+{
+  GtkFileChooserNative *dialog;
+
+  dialog = gtk_file_chooser_native_new ("Save constraints",
+                                        GTK_WINDOW (gtk_widget_get_root (GTK_WIDGET (button))),
+                                        GTK_FILE_CHOOSER_ACTION_SAVE,
+                                        "_Save",
+                                        "_Cancel");
+
+  gtk_native_dialog_set_modal (GTK_NATIVE_DIALOG (dialog), TRUE);
+  gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (dialog), ".");
+  g_signal_connect (dialog, "response", G_CALLBACK (save_response_cb), self);
+  gtk_native_dialog_show (GTK_NATIVE_DIALOG (dialog));
+}
+
 static void
 constraint_editor_window_finalize (GObject *object)
 {
@@ -213,6 +358,8 @@ constraint_editor_window_class_init (ConstraintEditorWindowClass *class)
   gtk_widget_class_bind_template_child (widget_class, ConstraintEditorWindow, view);
   gtk_widget_class_bind_template_child (widget_class, ConstraintEditorWindow, list);
 
+  gtk_widget_class_bind_template_callback (widget_class, open_cb);
+  gtk_widget_class_bind_template_callback (widget_class, save_cb);
   gtk_widget_class_bind_template_callback (widget_class, add_child);
   gtk_widget_class_bind_template_callback (widget_class, add_guide);
   gtk_widget_class_bind_template_callback (widget_class, add_constraint);
diff --git a/demos/constraint-editor/constraint-editor-window.ui 
b/demos/constraint-editor/constraint-editor-window.ui
index c2c9a009ec..0d2e72fcea 100644
--- a/demos/constraint-editor/constraint-editor-window.ui
+++ b/demos/constraint-editor/constraint-editor-window.ui
@@ -11,6 +11,20 @@
       <object class="GtkHeaderBar" id="header">
         <property name="title" translatable="yes">GTK Constraint Editor</property>
         <property name="show-title-buttons">1</property>
+        <child type="start">
+          <object class="GtkButton">
+            <property name="icon-name">document-open-symbolic</property>
+            <property name="tooltip-text">Open ui file</property>
+            <signal name="clicked" handler="open_cb"/>
+          </object>
+        </child>
+        <child type="start">
+          <object class="GtkButton">
+            <property name="icon-name">document-save-symbolic</property>
+            <property name="tooltip-text">Save to ui file</property>
+            <signal name="clicked" handler="save_cb"/>
+          </object>
+        </child>
       </object>
     </child>
     <child>
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);
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