Learning_GTK4_tree/demos/constraint-editor/constraint-editor.c

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/*
* Copyright © 2019 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Matthias Clasen
*/
#include "config.h"
#include "constraint-editor.h"
#include "constraint-view.h"
struct _ConstraintEditor
{
GtkWidget parent_instance;
GtkWidget *grid;
GtkWidget *target;
GtkWidget *target_attr;
GtkWidget *relation;
GtkWidget *source;
GtkWidget *source_attr;
GtkWidget *multiplier;
GtkWidget *constant;
GtkWidget *strength;
GtkWidget *preview;
GtkWidget *button;
GtkConstraint *constraint;
GListModel *model;
gboolean constructed;
};
enum {
PROP_MODEL = 1,
PROP_CONSTRAINT,
LAST_PROP
};
static GParamSpec *pspecs[LAST_PROP];
enum {
DONE,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL];
G_DEFINE_TYPE(ConstraintEditor, constraint_editor, GTK_TYPE_WIDGET);
static const char *
get_target_name (GtkConstraintTarget *target)
{
if (target == NULL)
return "Super";
else if (GTK_IS_WIDGET (target))
return gtk_widget_get_name (GTK_WIDGET (target));
else if (GTK_IS_CONSTRAINT_GUIDE (target))
return gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (target));
else
return "";
}
static void
constraint_target_combo (GListModel *model,
GtkWidget *combo,
gboolean is_source)
{
GtkStringList *targets;
int i;
targets = gtk_string_list_new (NULL);
gtk_string_list_append (targets, "Super");
if (model)
{
for (i = 0; i < g_list_model_get_n_items (model); i++)
{
GObject *item = g_list_model_get_object (model, i);
if (GTK_IS_CONSTRAINT (item))
continue;
gtk_string_list_append (targets, get_target_name (GTK_CONSTRAINT_TARGET (item)));
g_object_unref (item);
}
}
gtk_drop_down_set_model (GTK_DROP_DOWN (combo), G_LIST_MODEL (targets));
g_object_unref (targets);
}
static gpointer
get_target (GListModel *model,
const char *id)
{
int i;
if (id == NULL)
return NULL;
if (strcmp ("Super", id) == 0)
return NULL;
for (i = 0; i < g_list_model_get_n_items (model); i++)
{
GObject *item = g_list_model_get_object (model, i);
g_object_unref (item);
if (GTK_IS_CONSTRAINT (item))
continue;
else if (GTK_IS_WIDGET (item))
{
if (strcmp (id, gtk_widget_get_name (GTK_WIDGET (item))) == 0)
return item;
}
else if (GTK_IS_CONSTRAINT_GUIDE (item))
{
if (strcmp (id, gtk_constraint_guide_get_name (GTK_CONSTRAINT_GUIDE (item))) == 0)
return item;
}
}
return NULL;
}
static void
select_target (GtkDropDown *combo,
const char *target_name)
{
GListModel *model = gtk_drop_down_get_model (combo);
for (unsigned int i = 0; i < g_list_model_get_n_items (model); i++)
{
GtkStringObject *s = g_list_model_get_item (model, i);
g_object_unref (s);
if (strcmp (target_name, gtk_string_object_get_string (s)) == 0)
{
gtk_drop_down_set_selected (GTK_DROP_DOWN (combo), i);
return;
}
}
}
static GtkConstraintAttribute
get_attr (unsigned int id)
{
switch (id)
{
case 0: return GTK_CONSTRAINT_ATTRIBUTE_NONE;
case 1: return GTK_CONSTRAINT_ATTRIBUTE_LEFT;
case 2: return GTK_CONSTRAINT_ATTRIBUTE_RIGHT;
case 3: return GTK_CONSTRAINT_ATTRIBUTE_TOP;
case 4: return GTK_CONSTRAINT_ATTRIBUTE_BOTTOM;
case 5: return GTK_CONSTRAINT_ATTRIBUTE_START;
case 6: return GTK_CONSTRAINT_ATTRIBUTE_END;
case 7: return GTK_CONSTRAINT_ATTRIBUTE_WIDTH;
case 8: return GTK_CONSTRAINT_ATTRIBUTE_HEIGHT;
case 9: return GTK_CONSTRAINT_ATTRIBUTE_CENTER_X;
case 10: return GTK_CONSTRAINT_ATTRIBUTE_CENTER_Y;
case 11: return GTK_CONSTRAINT_ATTRIBUTE_BASELINE;
default: g_assert_not_reached ();
}
}
static unsigned int
get_attr_id (GtkConstraintAttribute attr)
{
switch (attr)
{
case GTK_CONSTRAINT_ATTRIBUTE_NONE: return 0;
case GTK_CONSTRAINT_ATTRIBUTE_LEFT: return 1;
case GTK_CONSTRAINT_ATTRIBUTE_RIGHT: return 2;
case GTK_CONSTRAINT_ATTRIBUTE_TOP: return 3;
case GTK_CONSTRAINT_ATTRIBUTE_BOTTOM: return 4;
case GTK_CONSTRAINT_ATTRIBUTE_START: return 5;
case GTK_CONSTRAINT_ATTRIBUTE_END: return 6;
case GTK_CONSTRAINT_ATTRIBUTE_WIDTH: return 7;
case GTK_CONSTRAINT_ATTRIBUTE_HEIGHT: return 8;
case GTK_CONSTRAINT_ATTRIBUTE_CENTER_X: return 9;
case GTK_CONSTRAINT_ATTRIBUTE_CENTER_Y: return 10;
case GTK_CONSTRAINT_ATTRIBUTE_BASELINE: return 11;
default: g_assert_not_reached ();
}
}
static const char *
get_attr_nick (GtkConstraintAttribute attr)
{
GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_ATTRIBUTE);
GEnumValue *value = g_enum_get_value (class, attr);
const char *nick = value->value_nick;
g_type_class_unref (class);
return nick;
}
static GtkConstraintRelation
get_relation (unsigned int id)
{
switch (id)
{
case 0: return GTK_CONSTRAINT_RELATION_LE;
case 1: return GTK_CONSTRAINT_RELATION_EQ;
case 2: return GTK_CONSTRAINT_RELATION_GE;
default: g_assert_not_reached ();
}
}
static unsigned int
get_relation_id (GtkConstraintRelation relation)
{
switch (relation)
{
case GTK_CONSTRAINT_RELATION_LE: return 0;
case GTK_CONSTRAINT_RELATION_EQ: return 1;
case GTK_CONSTRAINT_RELATION_GE: return 2;
default: g_assert_not_reached ();
}
}
static const char *
get_relation_nick (GtkConstraintRelation relation)
{
GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_RELATION);
GEnumValue *value = g_enum_get_value (class, relation);
const char *nick = value->value_nick;
g_type_class_unref (class);
return nick;
}
static const char *
get_relation_display_name (GtkConstraintRelation relation)
{
switch (relation)
{
case GTK_CONSTRAINT_RELATION_LE:
return "";
case GTK_CONSTRAINT_RELATION_EQ:
return "=";
case GTK_CONSTRAINT_RELATION_GE:
return "";
default:
return "?";
}
}
static GtkConstraintStrength
get_strength (unsigned int id)
{
switch (id)
{
case 0: return GTK_CONSTRAINT_STRENGTH_WEAK;
case 1: return GTK_CONSTRAINT_STRENGTH_MEDIUM;
case 2: return GTK_CONSTRAINT_STRENGTH_STRONG;
case 3: return GTK_CONSTRAINT_STRENGTH_REQUIRED;
default: g_assert_not_reached ();
}
}
static unsigned int
get_strength_id (GtkConstraintStrength strength)
{
switch (strength)
{
case GTK_CONSTRAINT_STRENGTH_WEAK: return 0;
case GTK_CONSTRAINT_STRENGTH_MEDIUM: return 1;
case GTK_CONSTRAINT_STRENGTH_STRONG: return 2;
case GTK_CONSTRAINT_STRENGTH_REQUIRED: return 3;
default: g_assert_not_reached ();
}
}
static const char *
get_strength_nick (GtkConstraintStrength strength)
{
GEnumClass *class = g_type_class_ref (GTK_TYPE_CONSTRAINT_STRENGTH);
GEnumValue *value = g_enum_get_value (class, strength);
const char *nick = value->value_nick;
g_type_class_unref (class);
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)
{
gpointer obj;
gpointer target;
GtkConstraintAttribute target_attr;
gpointer source;
GtkConstraintAttribute source_attr;
GtkConstraintRelation relation;
double multiplier;
double constant;
int strength;
GtkConstraint *constraint;
obj = gtk_drop_down_get_selected_item (GTK_DROP_DOWN (editor->target));
if (obj)
target = get_target (editor->model, gtk_string_object_get_string (GTK_STRING_OBJECT (obj)));
else
target = NULL;
target_attr = get_attr (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->target_attr)));
obj = gtk_drop_down_get_selected_item (GTK_DROP_DOWN (editor->source));
if (obj)
source = get_target (editor->model, gtk_string_object_get_string (GTK_STRING_OBJECT (obj)));
else
source = NULL;
source_attr = get_attr (gtk_drop_down_get_selected (GTK_DROP_DOWN(editor->source_attr)));
relation = get_relation (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->relation)));
multiplier = g_ascii_strtod (gtk_editable_get_text (GTK_EDITABLE (editor->multiplier)), NULL);
constant = g_ascii_strtod (gtk_editable_get_text (GTK_EDITABLE (editor->constant)), NULL);
strength = get_strength (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->strength)));
constraint = gtk_constraint_new (target, target_attr,
relation,
source, source_attr,
multiplier,
constant,
strength);
g_signal_emit (editor, signals[DONE], 0, constraint);
g_object_unref (constraint);
}
static void
source_attr_changed (ConstraintEditor *editor)
{
if (get_attr (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->source_attr))) == GTK_CONSTRAINT_ATTRIBUTE_NONE)
{
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->source), GTK_INVALID_LIST_POSITION);
gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), "");
gtk_widget_set_sensitive (editor->source, FALSE);
gtk_widget_set_sensitive (editor->multiplier, FALSE);
}
else
{
gtk_widget_set_sensitive (editor->source, TRUE);
gtk_widget_set_sensitive (editor->multiplier, TRUE);
gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), "1");
}
}
char *
constraint_editor_constraint_to_string (GtkConstraint *constraint)
{
GString *str;
const char *name;
const char *attr;
const char *relation;
double c, m;
str = g_string_new ("");
name = get_target_name (gtk_constraint_get_target (constraint));
attr = get_attr_nick (gtk_constraint_get_target_attribute (constraint));
relation = get_relation_display_name (gtk_constraint_get_relation (constraint));
if (name == NULL)
name = "[ ]";
g_string_append_printf (str, "%s.%s %s ", name, attr, relation);
c = gtk_constraint_get_constant (constraint);
attr = get_attr_nick (gtk_constraint_get_source_attribute (constraint));
if (strcmp (attr, "none") != 0)
{
name = get_target_name (gtk_constraint_get_source (constraint));
m = gtk_constraint_get_multiplier (constraint);
if (name == NULL)
name = "[ ]";
g_string_append_printf (str, "%s.%s", name, attr);
if (m != 1.0)
g_string_append_printf (str, " × %g", m);
if (c > 0.0)
g_string_append_printf (str, " + %g", c);
else if (c < 0.0)
g_string_append_printf (str, " - %g", -c);
}
else
g_string_append_printf (str, "%g", c);
return g_string_free (str, FALSE);
}
static void
update_preview (ConstraintEditor *editor)
{
GString *str;
const char *name;
const char *attr;
const char *relation;
const char *multiplier;
const char *constant;
double c, m;
if (!editor->constructed)
return;
str = g_string_new ("");
name = gtk_string_object_get_string (GTK_STRING_OBJECT (gtk_drop_down_get_selected_item (GTK_DROP_DOWN (editor->target))));
attr = get_attr_nick (get_attr (gtk_drop_down_get_selected ((GTK_DROP_DOWN (editor->target_attr)))));
relation = get_relation_nick (get_relation (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->relation))));
if (name == NULL)
name = "[ ]";
g_string_append_printf (str, "%s.%s %s ", name, attr, relation);
constant = gtk_editable_get_text (GTK_EDITABLE (editor->constant));
c = g_ascii_strtod (constant, NULL);
attr = get_attr_nick (get_attr (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->source_attr))));
if (strcmp (attr, "none") != 0)
{
name = gtk_string_object_get_string (GTK_STRING_OBJECT (gtk_drop_down_get_selected_item (GTK_DROP_DOWN (editor->source))));
multiplier = gtk_editable_get_text (GTK_EDITABLE (editor->multiplier));
m = g_ascii_strtod (multiplier, NULL);
if (name == NULL)
name = "[ ]";
g_string_append_printf (str, "%s.%s", name, attr);
if (m != 1.0)
g_string_append_printf (str, " × %g", m);
if (c > 0.0)
g_string_append_printf (str, " + %g", c);
else if (c < 0.0)
g_string_append_printf (str, " - %g", -c);
}
else
g_string_append_printf (str, "%g", c);
gtk_label_set_label (GTK_LABEL (editor->preview), str->str);
g_string_free (str, TRUE);
}
static void
update_button (ConstraintEditor *editor)
{
gpointer obj;
const char *target;
const char *source;
GtkConstraintAttribute source_attr = get_attr (gtk_drop_down_get_selected (GTK_DROP_DOWN (editor->source_attr)));
obj = gtk_drop_down_get_selected_item (GTK_DROP_DOWN (editor->target));
target = obj ? gtk_string_object_get_string (GTK_STRING_OBJECT (obj)) : NULL;
obj = gtk_drop_down_get_selected_item (GTK_DROP_DOWN (editor->source));
source = obj ? gtk_string_object_get_string (GTK_STRING_OBJECT (obj)) : NULL;
if (target && (source || (source_attr == GTK_CONSTRAINT_ATTRIBUTE_NONE)))
gtk_widget_set_sensitive (editor->button, TRUE);
else
gtk_widget_set_sensitive (editor->button, FALSE);
}
static void
constraint_editor_init (ConstraintEditor *editor)
{
gtk_widget_init_template (GTK_WIDGET (editor));
}
static void
constraint_editor_constructed (GObject *object)
{
ConstraintEditor *editor = CONSTRAINT_EDITOR (object);
constraint_target_combo (editor->model, editor->target, FALSE);
constraint_target_combo (editor->model, editor->source, TRUE);
if (editor->constraint)
{
GtkConstraintTarget *target;
GtkConstraintAttribute attr;
GtkConstraintRelation relation;
GtkConstraintStrength strength;
char *val;
double multiplier;
double constant;
target = gtk_constraint_get_target (editor->constraint);
select_target (GTK_DROP_DOWN (editor->target), get_target_name (target));
attr = gtk_constraint_get_target_attribute (editor->constraint);
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->target_attr), get_attr_id (attr));
target = gtk_constraint_get_source (editor->constraint);
select_target (GTK_DROP_DOWN (editor->source), get_target_name (target));
attr = gtk_constraint_get_source_attribute (editor->constraint);
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->source_attr), get_attr_id (attr));
relation = gtk_constraint_get_relation (editor->constraint);
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->relation), get_relation_id (relation));
multiplier = gtk_constraint_get_multiplier (editor->constraint);
val = g_strdup_printf ("%g", multiplier);
gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), val);
g_free (val);
constant = gtk_constraint_get_constant (editor->constraint);
val = g_strdup_printf ("%g", constant);
gtk_editable_set_text (GTK_EDITABLE (editor->constant), val);
g_free (val);
strength = gtk_constraint_get_strength (editor->constraint);
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->strength), get_strength_id (strength));
gtk_button_set_label (GTK_BUTTON (editor->button), "Apply");
}
else
{
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->target_attr), get_attr_id (GTK_CONSTRAINT_ATTRIBUTE_LEFT));
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->source_attr), get_attr_id (GTK_CONSTRAINT_ATTRIBUTE_LEFT));
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->relation), get_relation_id (GTK_CONSTRAINT_RELATION_EQ));
gtk_drop_down_set_selected (GTK_DROP_DOWN (editor->strength), get_strength_id (GTK_CONSTRAINT_STRENGTH_REQUIRED));
gtk_editable_set_text (GTK_EDITABLE (editor->multiplier), "1.0");
gtk_editable_set_text (GTK_EDITABLE (editor->constant), "0.0");
gtk_button_set_label (GTK_BUTTON (editor->button), "Create");
}
editor->constructed = TRUE;
update_preview (editor);
update_button (editor);
}
static void
constraint_editor_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
ConstraintEditor *self = CONSTRAINT_EDITOR (object);
switch (property_id)
{
case PROP_MODEL:
self->model = g_value_dup_object (value);
break;
case PROP_CONSTRAINT:
self->constraint = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
constraint_editor_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
ConstraintEditor *self = CONSTRAINT_EDITOR (object);
switch (property_id)
{
case PROP_MODEL:
g_value_set_object (value, self->model);
break;
case PROP_CONSTRAINT:
g_value_set_object (value, self->constraint);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
constraint_editor_dispose (GObject *object)
{
ConstraintEditor *self = (ConstraintEditor *)object;
g_clear_object (&self->model);
g_clear_object (&self->constraint);
gtk_widget_dispose_template (GTK_WIDGET (object), CONSTRAINT_EDITOR_TYPE);
G_OBJECT_CLASS (constraint_editor_parent_class)->dispose (object);
}
static void
constraint_editor_class_init (ConstraintEditorClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
object_class->constructed = constraint_editor_constructed;
object_class->dispose = constraint_editor_dispose;
object_class->set_property = constraint_editor_set_property;
object_class->get_property = constraint_editor_get_property;
pspecs[PROP_CONSTRAINT] =
g_param_spec_object ("constraint", "constraint", "constraint",
GTK_TYPE_CONSTRAINT,
G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY);
pspecs[PROP_MODEL] =
g_param_spec_object ("model", "model", "model",
G_TYPE_LIST_MODEL,
G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (object_class, LAST_PROP, pspecs);
signals[DONE] =
g_signal_new ("done",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL,
NULL,
G_TYPE_NONE, 1, GTK_TYPE_CONSTRAINT);
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
gtk_widget_class_set_template_from_resource (widget_class,
"/org/gtk/gtk4/constraint-editor/constraint-editor.ui");
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, grid);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, target);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, target_attr);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, relation);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, source);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, source_attr);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, multiplier);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, constant);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, strength);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, preview);
gtk_widget_class_bind_template_child (widget_class, ConstraintEditor, button);
gtk_widget_class_bind_template_callback (widget_class, update_preview);
gtk_widget_class_bind_template_callback (widget_class, update_button);
gtk_widget_class_bind_template_callback (widget_class, create_constraint);
gtk_widget_class_bind_template_callback (widget_class, source_attr_changed);
}
ConstraintEditor *
constraint_editor_new (GListModel *model,
GtkConstraint *constraint)
{
return g_object_new (CONSTRAINT_EDITOR_TYPE,
"model", model,
"constraint", constraint,
NULL);
}