346 lines
11 KiB
C
346 lines
11 KiB
C
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/* Copyright (C) 2019 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <gtk/gtk.h>
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#include "constraint-view.h"
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struct _ConstraintView
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{
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GtkWidget parent;
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GListModel *model;
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GtkWidget *drag_widget;
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};
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G_DEFINE_TYPE (ConstraintView, constraint_view, GTK_TYPE_WIDGET);
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static void
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constraint_view_dispose (GObject *object)
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{
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ConstraintView *view = CONSTRAINT_VIEW (object);
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GtkWidget *child;
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while ((child = gtk_widget_get_first_child (GTK_WIDGET (view))) != NULL)
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gtk_widget_unparent (child);
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g_clear_object (&view->model);
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G_OBJECT_CLASS (constraint_view_parent_class)->dispose (object);
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}
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static void
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constraint_view_class_init (ConstraintViewClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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object_class->dispose = constraint_view_dispose;
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gtk_widget_class_set_css_name (widget_class, "constraintview");
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}
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static void
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update_weak_position (ConstraintView *self,
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GtkWidget *child,
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double x,
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double y)
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{
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GtkLayoutManager *manager;
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GtkConstraint *constraint;
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manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
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constraint = (GtkConstraint *)g_object_get_data (G_OBJECT (child), "x-constraint");
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if (constraint)
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{
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gtk_constraint_layout_remove_constraint (GTK_CONSTRAINT_LAYOUT (manager),
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constraint);
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g_object_set_data (G_OBJECT (child), "x-constraint", NULL);
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}
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if (x != -100)
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{
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constraint = gtk_constraint_new_constant (child,
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GTK_CONSTRAINT_ATTRIBUTE_CENTER_X,
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GTK_CONSTRAINT_RELATION_EQ,
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x,
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GTK_CONSTRAINT_STRENGTH_WEAK);
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g_object_set_data (G_OBJECT (constraint), "internal", (char *)"yes");
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gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (manager),
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constraint);
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g_object_set_data (G_OBJECT (child), "x-constraint", constraint);
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}
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constraint = (GtkConstraint *)g_object_get_data (G_OBJECT (child), "y-constraint");
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if (constraint)
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{
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gtk_constraint_layout_remove_constraint (GTK_CONSTRAINT_LAYOUT (manager),
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constraint);
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g_object_set_data (G_OBJECT (child), "y-constraint", NULL);
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}
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if (y != -100)
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{
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constraint = gtk_constraint_new_constant (child,
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GTK_CONSTRAINT_ATTRIBUTE_CENTER_Y,
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GTK_CONSTRAINT_RELATION_EQ,
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y,
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GTK_CONSTRAINT_STRENGTH_WEAK);
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g_object_set_data (G_OBJECT (constraint), "internal", (char *)"yes");
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gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (manager),
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constraint);
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g_object_set_data (G_OBJECT (child), "y-constraint", constraint);
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}
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}
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static void
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drag_begin (GtkGestureDrag *drag,
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double start_x,
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double start_y,
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ConstraintView *self)
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{
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GtkWidget *widget;
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widget = gtk_widget_pick (GTK_WIDGET (self), start_x, start_y, GTK_PICK_DEFAULT);
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if (GTK_IS_LABEL (widget))
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{
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widget = gtk_widget_get_ancestor (widget, GTK_TYPE_FRAME);
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if (widget &&
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gtk_widget_get_parent (widget) == (GtkWidget *)self)
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{
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self->drag_widget = widget;
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}
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}
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}
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static void
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drag_update (GtkGestureDrag *drag,
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double offset_x,
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double offset_y,
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ConstraintView *self)
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{
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double x, y;
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if (!self->drag_widget)
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return;
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gtk_gesture_drag_get_start_point (drag, &x, &y);
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update_weak_position (self, self->drag_widget, x + offset_x, y + offset_y);
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}
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static void
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drag_end (GtkGestureDrag *drag,
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double offset_x,
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double offset_y,
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ConstraintView *self)
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{
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self->drag_widget = NULL;
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}
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static gboolean
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omit_internal (gpointer item, gpointer user_data)
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{
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if (g_object_get_data (G_OBJECT (item), "internal"))
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return FALSE;
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return TRUE;
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}
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static void
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constraint_view_init (ConstraintView *self)
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{
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GtkLayoutManager *manager;
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GtkEventController *controller;
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GListStore *list;
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GListModel *all_children;
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GListModel *all_constraints;
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GListModel *guides;
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GListModel *children;
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GListModel *constraints;
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GtkFilter *filter;
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manager = gtk_constraint_layout_new ();
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gtk_widget_set_layout_manager (GTK_WIDGET (self), manager);
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guides = gtk_constraint_layout_observe_guides (GTK_CONSTRAINT_LAYOUT (manager));
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all_constraints = gtk_constraint_layout_observe_constraints (GTK_CONSTRAINT_LAYOUT (manager));
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filter = GTK_FILTER (gtk_custom_filter_new (omit_internal, NULL, NULL));
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constraints = (GListModel *)gtk_filter_list_model_new (all_constraints, filter);
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all_children = gtk_widget_observe_children (GTK_WIDGET (self));
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filter = GTK_FILTER (gtk_custom_filter_new (omit_internal, NULL, NULL));
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children = (GListModel *)gtk_filter_list_model_new (all_children, filter);
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list = g_list_store_new (G_TYPE_LIST_MODEL);
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g_list_store_append (list, children);
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g_list_store_append (list, guides);
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g_list_store_append (list, constraints);
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g_object_unref (children);
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g_object_unref (guides);
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g_object_unref (constraints);
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self->model = G_LIST_MODEL (gtk_flatten_list_model_new (G_LIST_MODEL (list)));
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controller = (GtkEventController *)gtk_gesture_drag_new ();
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g_signal_connect (controller, "drag-begin", G_CALLBACK (drag_begin), self);
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g_signal_connect (controller, "drag-update", G_CALLBACK (drag_update), self);
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g_signal_connect (controller, "drag-end", G_CALLBACK (drag_end), self);
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gtk_widget_add_controller (GTK_WIDGET (self), controller);
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}
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ConstraintView *
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constraint_view_new (void)
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{
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return g_object_new (CONSTRAINT_VIEW_TYPE, NULL);
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}
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void
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constraint_view_add_child (ConstraintView *view,
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const char *name)
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{
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GtkWidget *frame;
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GtkWidget *label;
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label = gtk_label_new (name);
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frame = gtk_frame_new (NULL);
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gtk_widget_add_css_class (frame, "child");
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gtk_widget_set_name (frame, name);
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gtk_frame_set_child (GTK_FRAME (frame), label);
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gtk_widget_set_parent (frame, GTK_WIDGET (view));
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update_weak_position (view, frame, 100, 100);
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}
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void
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constraint_view_remove_child (ConstraintView *view,
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GtkWidget *child)
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{
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update_weak_position (view, child, -100, -100);
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gtk_widget_unparent (child);
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}
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void
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constraint_view_add_guide (ConstraintView *view,
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GtkConstraintGuide *guide)
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{
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GtkConstraintLayout *layout;
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GtkWidget *frame;
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GtkWidget *label;
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const char *name;
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GtkConstraint *constraint;
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struct {
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const char *name;
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GtkConstraintAttribute attr;
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} names[] = {
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{ "left-constraint", GTK_CONSTRAINT_ATTRIBUTE_LEFT },
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{ "top-constraint", GTK_CONSTRAINT_ATTRIBUTE_TOP },
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{ "width-constraint", GTK_CONSTRAINT_ATTRIBUTE_WIDTH },
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{ "height-constraint", GTK_CONSTRAINT_ATTRIBUTE_HEIGHT },
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};
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int i;
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name = gtk_constraint_guide_get_name (guide);
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label = gtk_label_new (name);
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g_object_bind_property (guide, "name",
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label, "label",
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G_BINDING_DEFAULT);
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frame = gtk_frame_new (NULL);
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gtk_widget_add_css_class (frame, "guide");
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g_object_set_data (G_OBJECT (frame), "internal", (char *)"yes");
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gtk_frame_set_child (GTK_FRAME (frame), label);
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gtk_widget_insert_after (frame, GTK_WIDGET (view), NULL);
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g_object_set_data (G_OBJECT (guide), "frame", frame);
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layout = GTK_CONSTRAINT_LAYOUT (gtk_widget_get_layout_manager (GTK_WIDGET (view)));
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gtk_constraint_layout_add_guide (layout, g_object_ref (guide));
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for (i = 0; i < G_N_ELEMENTS (names); i++)
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{
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constraint = gtk_constraint_new (frame,
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names[i].attr,
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GTK_CONSTRAINT_RELATION_EQ,
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guide,
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names[i].attr,
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1.0, 0.0,
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GTK_CONSTRAINT_STRENGTH_REQUIRED);
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g_object_set_data (G_OBJECT (constraint), "internal", (char *)"yes");
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gtk_constraint_layout_add_constraint (layout, constraint);
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g_object_set_data (G_OBJECT (guide), names[i].name, constraint);
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}
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update_weak_position (view, frame, 150, 150);
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}
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void
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constraint_view_remove_guide (ConstraintView *view,
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GtkConstraintGuide *guide)
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{
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GtkConstraintLayout *layout;
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GtkWidget *frame;
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GtkConstraint *constraint;
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const char *names[] = {
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"left-constraint",
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"top-constraint",
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"width-constraint",
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"height-constraint"
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};
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int i;
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layout = GTK_CONSTRAINT_LAYOUT (gtk_widget_get_layout_manager (GTK_WIDGET (view)));
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for (i = 0; i < G_N_ELEMENTS (names); i++)
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{
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constraint = (GtkConstraint*)g_object_get_data (G_OBJECT (guide), names[i]);
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gtk_constraint_layout_remove_constraint (layout, constraint);
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}
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frame = (GtkWidget *)g_object_get_data (G_OBJECT (guide), "frame");
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update_weak_position (view, frame, -100, -100);
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gtk_widget_unparent (frame);
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gtk_constraint_layout_remove_guide (layout, guide);
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}
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void
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constraint_view_add_constraint (ConstraintView *view,
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GtkConstraint *constraint)
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{
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GtkLayoutManager *manager;
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manager = gtk_widget_get_layout_manager (GTK_WIDGET (view));
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gtk_constraint_layout_add_constraint (GTK_CONSTRAINT_LAYOUT (manager),
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g_object_ref (constraint));
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}
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void
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constraint_view_remove_constraint (ConstraintView *view,
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GtkConstraint *constraint)
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{
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GtkLayoutManager *manager;
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manager = gtk_widget_get_layout_manager (GTK_WIDGET (view));
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gtk_constraint_layout_remove_constraint (GTK_CONSTRAINT_LAYOUT (manager),
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constraint);
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}
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GListModel *
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constraint_view_get_model (ConstraintView *view)
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{
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return view->model;
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}
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