464 lines
13 KiB
C
464 lines
13 KiB
C
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/* gtkoverlaylayout.c: Overlay layout manager
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* Copyright 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 "config.h"
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#include "gtkoverlaylayout.h"
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#include "gtklayoutchild.h"
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#include "gtkoverlay.h"
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#include "gtkprivate.h"
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#include "gtkwidgetprivate.h"
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#include <graphene-gobject.h>
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/**
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* GtkOverlayLayout:
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*
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* `GtkOverlayLayout` is the layout manager used by [class@Gtk.Overlay].
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*
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* It places widgets as overlays on top of the main child.
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*
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* This is not a reusable layout manager, since it expects its widget
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* to be a `GtkOverlay`. It is only listed here so that its layout
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* properties get documented.
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*/
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/**
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* GtkOverlayLayoutChild:
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*
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* `GtkLayoutChild` subclass for children in a `GtkOverlayLayout`.
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*/
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struct _GtkOverlayLayout
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{
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GtkLayoutManager parent_instance;
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};
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struct _GtkOverlayLayoutChild
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{
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GtkLayoutChild parent_instance;
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guint measure : 1;
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guint clip_overlay : 1;
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};
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enum
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{
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PROP_MEASURE = 1,
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PROP_CLIP_OVERLAY,
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N_CHILD_PROPERTIES
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};
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static GParamSpec *child_props[N_CHILD_PROPERTIES];
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G_DEFINE_TYPE (GtkOverlayLayoutChild, gtk_overlay_layout_child, GTK_TYPE_LAYOUT_CHILD)
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static void
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gtk_overlay_layout_child_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GtkOverlayLayoutChild *self = GTK_OVERLAY_LAYOUT_CHILD (gobject);
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switch (prop_id)
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{
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case PROP_MEASURE:
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gtk_overlay_layout_child_set_measure (self, g_value_get_boolean (value));
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break;
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case PROP_CLIP_OVERLAY:
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gtk_overlay_layout_child_set_clip_overlay (self, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_overlay_layout_child_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GtkOverlayLayoutChild *self = GTK_OVERLAY_LAYOUT_CHILD (gobject);
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switch (prop_id)
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{
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case PROP_MEASURE:
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g_value_set_boolean (value, self->measure);
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break;
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case PROP_CLIP_OVERLAY:
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g_value_set_boolean (value, self->clip_overlay);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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gtk_overlay_layout_child_class_init (GtkOverlayLayoutChildClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = gtk_overlay_layout_child_set_property;
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gobject_class->get_property = gtk_overlay_layout_child_get_property;
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/**
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* GtkOverlayLayoutChild:measure: (attributes org.gtk.Property.get=gtk_overlay_layout_child_get_measure org.gtk.Property.set=gtk_overlay_layout_child_set_measure)
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*
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* Whether the child size should contribute to the `GtkOverlayLayout`'s
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* measurement.
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*/
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child_props[PROP_MEASURE] =
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g_param_spec_boolean ("measure", NULL, NULL,
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FALSE,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
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/**
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* GtkOverlayLayoutChild:clip-overlay: (attributes org.gtk.Property.get=gtk_overlay_layout_child_get_clip_overlay org.gtk.Property.set=gtk_overlay_layout_child_set_clip_overlay)
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*
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* Whether the child should be clipped to fit the parent's size.
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*/
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child_props[PROP_CLIP_OVERLAY] =
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g_param_spec_boolean ("clip-overlay", NULL, NULL,
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FALSE,
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GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
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g_object_class_install_properties (gobject_class, N_CHILD_PROPERTIES, child_props);
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}
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static void
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gtk_overlay_layout_child_init (GtkOverlayLayoutChild *self)
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{
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}
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/**
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* gtk_overlay_layout_child_set_measure: (attributes org.gtk.Method.set_property=measure)
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* @child: a `GtkOverlayLayoutChild`
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* @measure: whether to measure this child
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*
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* Sets whether to measure this child.
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*/
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void
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gtk_overlay_layout_child_set_measure (GtkOverlayLayoutChild *child,
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gboolean measure)
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{
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GtkLayoutManager *layout;
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g_return_if_fail (GTK_IS_OVERLAY_LAYOUT_CHILD (child));
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if (child->measure == measure)
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return;
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child->measure = measure;
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layout = gtk_layout_child_get_layout_manager (GTK_LAYOUT_CHILD (child));
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gtk_layout_manager_layout_changed (layout);
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g_object_notify_by_pspec (G_OBJECT (child), child_props[PROP_MEASURE]);
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}
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/**
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* gtk_overlay_layout_child_get_measure: (attributes org.gtk.Method.get_property=measure)
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* @child: a `GtkOverlayLayoutChild`
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*
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* Retrieves whether the child is measured.
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*
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* Returns: whether the child is measured
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*/
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gboolean
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gtk_overlay_layout_child_get_measure (GtkOverlayLayoutChild *child)
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{
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g_return_val_if_fail (GTK_IS_OVERLAY_LAYOUT_CHILD (child), FALSE);
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return child->measure;
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}
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/**
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* gtk_overlay_layout_child_set_clip_overlay: (attributes org.gtk.Method.set_property=clip-overlay)
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* @child: a `GtkOverlayLayoutChild`
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* @clip_overlay: whether to clip this child
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*
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* Sets whether to clip this child.
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*/
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void
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gtk_overlay_layout_child_set_clip_overlay (GtkOverlayLayoutChild *child,
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gboolean clip_overlay)
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{
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GtkLayoutManager *layout;
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g_return_if_fail (GTK_IS_OVERLAY_LAYOUT_CHILD (child));
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if (child->clip_overlay == clip_overlay)
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return;
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child->clip_overlay = clip_overlay;
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layout = gtk_layout_child_get_layout_manager (GTK_LAYOUT_CHILD (child));
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gtk_layout_manager_layout_changed (layout);
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g_object_notify_by_pspec (G_OBJECT (child), child_props[PROP_CLIP_OVERLAY]);
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}
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/**
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* gtk_overlay_layout_child_get_clip_overlay: (attributes org.gtk.Method.get_property=clip-overlay)
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* @child: a `GtkOverlayLayoutChild`
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*
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* Retrieves whether the child is clipped.
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*
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* Returns: whether the child is clipped
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*/
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gboolean
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gtk_overlay_layout_child_get_clip_overlay (GtkOverlayLayoutChild *child)
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{
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g_return_val_if_fail (GTK_IS_OVERLAY_LAYOUT_CHILD (child), FALSE);
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return child->clip_overlay;
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}
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G_DEFINE_TYPE (GtkOverlayLayout, gtk_overlay_layout, GTK_TYPE_LAYOUT_MANAGER)
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static void
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gtk_overlay_layout_measure (GtkLayoutManager *layout_manager,
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GtkWidget *widget,
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GtkOrientation orientation,
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int for_size,
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int *minimum,
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int *natural,
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int *minimum_baseline,
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int *natural_baseline)
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{
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GtkOverlayLayoutChild *child_info;
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GtkWidget *child;
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int min, nat;
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GtkWidget *main_widget;
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main_widget = gtk_overlay_get_child (GTK_OVERLAY (widget));
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min = 0;
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nat = 0;
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for (child = _gtk_widget_get_first_child (widget);
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child != NULL;
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child = _gtk_widget_get_next_sibling (child))
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{
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if (!gtk_widget_should_layout (child))
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continue;
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child_info = GTK_OVERLAY_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (layout_manager, child));
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if (child == main_widget || child_info->measure)
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{
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int child_min, child_nat, child_min_baseline, child_nat_baseline;
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gtk_widget_measure (child,
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orientation,
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for_size,
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&child_min, &child_nat,
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&child_min_baseline, &child_nat_baseline);
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min = MAX (min, child_min);
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nat = MAX (nat, child_nat);
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}
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}
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if (minimum != NULL)
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*minimum = min;
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if (natural != NULL)
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*natural = nat;
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}
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static void
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gtk_overlay_compute_child_allocation (GtkOverlay *overlay,
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GtkWidget *widget,
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GtkOverlayLayoutChild *child,
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GtkAllocation *widget_allocation)
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{
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GtkAllocation allocation;
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gboolean result;
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g_signal_emit_by_name (overlay, "get-child-position",
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widget, &allocation, &result);
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widget_allocation->x = allocation.x;
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widget_allocation->y = allocation.y;
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widget_allocation->width = allocation.width;
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widget_allocation->height = allocation.height;
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}
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static GtkAlign
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effective_align (GtkAlign align,
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GtkTextDirection direction)
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{
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switch (align)
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{
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case GTK_ALIGN_START:
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return direction == GTK_TEXT_DIR_RTL ? GTK_ALIGN_END : GTK_ALIGN_START;
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case GTK_ALIGN_END:
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return direction == GTK_TEXT_DIR_RTL ? GTK_ALIGN_START : GTK_ALIGN_END;
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case GTK_ALIGN_FILL:
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case GTK_ALIGN_CENTER:
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case GTK_ALIGN_BASELINE_FILL:
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case GTK_ALIGN_BASELINE_CENTER:
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default:
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return align;
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}
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}
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static void
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gtk_overlay_child_update_style_classes (GtkOverlay *overlay,
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GtkWidget *child,
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GtkAllocation *child_allocation)
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{
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GtkWidget *widget = GTK_WIDGET (overlay);
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int width, height;
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GtkAlign valign, halign;
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gboolean is_left, is_right, is_top, is_bottom;
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gboolean has_left, has_right, has_top, has_bottom;
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has_left = gtk_widget_has_css_class (child, "left");
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has_right = gtk_widget_has_css_class (child, "right");
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has_top = gtk_widget_has_css_class (child, "top");
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has_bottom = gtk_widget_has_css_class (child, "bottom");
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is_left = is_right = is_top = is_bottom = FALSE;
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width = gtk_widget_get_width (widget);
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height = gtk_widget_get_height (widget);
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halign = effective_align (gtk_widget_get_halign (child),
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gtk_widget_get_direction (child));
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if (halign == GTK_ALIGN_START)
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is_left = (child_allocation->x == 0);
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else if (halign == GTK_ALIGN_END)
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is_right = (child_allocation->x + child_allocation->width == width);
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valign = gtk_widget_get_valign (child);
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if (valign == GTK_ALIGN_START)
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is_top = (child_allocation->y == 0);
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else if (valign == GTK_ALIGN_END)
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is_bottom = (child_allocation->y + child_allocation->height == height);
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if (has_left && !is_left)
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gtk_widget_remove_css_class (child, "left");
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else if (!has_left && is_left)
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gtk_widget_add_css_class (child, "left");
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if (has_right && !is_right)
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gtk_widget_remove_css_class (child, "right");
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else if (!has_right && is_right)
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gtk_widget_add_css_class (child, "right");
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||
|
|
if (has_top && !is_top)
|
||
|
|
gtk_widget_remove_css_class (child, "top");
|
||
|
|
else if (!has_top && is_top)
|
||
|
|
gtk_widget_add_css_class (child, "top");
|
||
|
|
|
||
|
|
if (has_bottom && !is_bottom)
|
||
|
|
gtk_widget_remove_css_class (child, "bottom");
|
||
|
|
else if (!has_bottom && is_bottom)
|
||
|
|
gtk_widget_add_css_class (child, "bottom");
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_overlay_child_allocate (GtkOverlay *overlay,
|
||
|
|
GtkWidget *widget,
|
||
|
|
GtkOverlayLayoutChild *child)
|
||
|
|
{
|
||
|
|
GtkAllocation child_allocation;
|
||
|
|
|
||
|
|
if (!gtk_widget_should_layout (widget))
|
||
|
|
return;
|
||
|
|
|
||
|
|
gtk_overlay_compute_child_allocation (overlay, widget, child, &child_allocation);
|
||
|
|
|
||
|
|
gtk_overlay_child_update_style_classes (overlay, widget, &child_allocation);
|
||
|
|
gtk_widget_size_allocate (widget, &child_allocation, -1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_overlay_layout_allocate (GtkLayoutManager *layout_manager,
|
||
|
|
GtkWidget *widget,
|
||
|
|
int width,
|
||
|
|
int height,
|
||
|
|
int baseline)
|
||
|
|
{
|
||
|
|
GtkWidget *child;
|
||
|
|
GtkWidget *main_widget;
|
||
|
|
|
||
|
|
main_widget = gtk_overlay_get_child (GTK_OVERLAY (widget));
|
||
|
|
if (main_widget && gtk_widget_get_visible (main_widget))
|
||
|
|
gtk_widget_size_allocate (main_widget,
|
||
|
|
&(GtkAllocation) { 0, 0, width, height },
|
||
|
|
-1);
|
||
|
|
|
||
|
|
for (child = _gtk_widget_get_first_child (widget);
|
||
|
|
child != NULL;
|
||
|
|
child = _gtk_widget_get_next_sibling (child))
|
||
|
|
{
|
||
|
|
if (child != main_widget)
|
||
|
|
{
|
||
|
|
GtkOverlayLayoutChild *child_data;
|
||
|
|
child_data = GTK_OVERLAY_LAYOUT_CHILD (gtk_layout_manager_get_layout_child (layout_manager, child));
|
||
|
|
|
||
|
|
gtk_overlay_child_allocate (GTK_OVERLAY (widget), child, child_data);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_overlay_layout_class_init (GtkOverlayLayoutClass *klass)
|
||
|
|
{
|
||
|
|
GtkLayoutManagerClass *layout_class = GTK_LAYOUT_MANAGER_CLASS (klass);
|
||
|
|
|
||
|
|
layout_class->layout_child_type = GTK_TYPE_OVERLAY_LAYOUT_CHILD;
|
||
|
|
layout_class->measure = gtk_overlay_layout_measure;
|
||
|
|
layout_class->allocate = gtk_overlay_layout_allocate;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void
|
||
|
|
gtk_overlay_layout_init (GtkOverlayLayout *self)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* gtk_overlay_layout_new:
|
||
|
|
*
|
||
|
|
* Creates a new `GtkOverlayLayout` instance.
|
||
|
|
*
|
||
|
|
* Returns: the newly created instance
|
||
|
|
*/
|
||
|
|
GtkLayoutManager *
|
||
|
|
gtk_overlay_layout_new (void)
|
||
|
|
{
|
||
|
|
return g_object_new (GTK_TYPE_OVERLAY_LAYOUT, NULL);
|
||
|
|
}
|