PIKApp/app/widgets/pikaoverlaybox.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* PikaOverlayBox
* Copyright (C) 2009 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "widgets-types.h"
#include "pikaoverlaybox.h"
#include "pikaoverlaychild.h"
/* local function prototypes */
static void pika_overlay_box_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_overlay_box_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_overlay_box_realize (GtkWidget *widget);
static void pika_overlay_box_unrealize (GtkWidget *widget);
static void pika_overlay_box_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width);
static void pika_overlay_box_get_preferred_height(GtkWidget *widget,
gint *minimum_height,
gint *natural_height);
static void pika_overlay_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean pika_overlay_box_draw (GtkWidget *widget,
cairo_t *cr);
static gboolean pika_overlay_box_damage (GtkWidget *widget,
GdkEventExpose *event);
static void pika_overlay_box_add (GtkContainer *container,
GtkWidget *widget);
static void pika_overlay_box_remove (GtkContainer *container,
GtkWidget *widget);
static void pika_overlay_box_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static GType pika_overlay_box_child_type (GtkContainer *container);
static GdkWindow * pika_overlay_box_pick_embedded_child (GdkWindow *window,
gdouble x,
gdouble y,
PikaOverlayBox *box);
G_DEFINE_TYPE (PikaOverlayBox, pika_overlay_box, GTK_TYPE_CONTAINER)
#define parent_class pika_overlay_box_parent_class
static void
pika_overlay_box_class_init (PikaOverlayBoxClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
object_class->set_property = pika_overlay_box_set_property;
object_class->get_property = pika_overlay_box_get_property;
widget_class->realize = pika_overlay_box_realize;
widget_class->unrealize = pika_overlay_box_unrealize;
widget_class->get_preferred_width = pika_overlay_box_get_preferred_width;
widget_class->get_preferred_height = pika_overlay_box_get_preferred_height;
widget_class->size_allocate = pika_overlay_box_size_allocate;
widget_class->draw = pika_overlay_box_draw;
g_signal_override_class_handler ("damage-event",
PIKA_TYPE_OVERLAY_BOX,
G_CALLBACK (pika_overlay_box_damage));
container_class->add = pika_overlay_box_add;
container_class->remove = pika_overlay_box_remove;
container_class->forall = pika_overlay_box_forall;
container_class->child_type = pika_overlay_box_child_type;
}
static void
pika_overlay_box_init (PikaOverlayBox *box)
{
gtk_widget_set_has_window (GTK_WIDGET (box), TRUE);
}
static void
pika_overlay_box_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_overlay_box_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_overlay_box_realize (GtkWidget *widget)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GtkAllocation allocation;
GdkWindowAttr attributes;
gint attributes_mask;
GList *list;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.event_mask = gtk_widget_get_events (widget);
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
gtk_widget_set_window (widget,
gdk_window_new (gtk_widget_get_parent_window (widget),
&attributes, attributes_mask));
gdk_window_set_user_data (gtk_widget_get_window (widget), widget);
g_signal_connect (gtk_widget_get_window (widget), "pick-embedded-child",
G_CALLBACK (pika_overlay_box_pick_embedded_child),
widget);
for (list = box->children; list; list = g_list_next (list))
pika_overlay_child_realize (box, list->data);
}
static void
pika_overlay_box_unrealize (GtkWidget *widget)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GList *list;
for (list = box->children; list; list = g_list_next (list))
pika_overlay_child_unrealize (box, list->data);
GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
}
static void
pika_overlay_box_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GList *list;
*minimum_width = *natural_width = 0;
for (list = box->children; list; list = g_list_next (list))
{
gint minimum;
gint natural;
pika_overlay_child_get_preferred_width (box, list->data,
&minimum, &natural);
*minimum_width = MAX (*minimum_width, minimum);
*natural_width = MAX (*natural_width, natural);
}
*minimum_width = 0;
*minimum_width +=
2 * gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1;
*natural_width +=
2 * gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1;
}
static void
pika_overlay_box_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GList *list;
*minimum_height = *natural_height = 0;
for (list = box->children; list; list = g_list_next (list))
{
gint minimum;
gint natural;
pika_overlay_child_get_preferred_height (box, list->data,
&minimum, &natural);
*minimum_height = MAX (*minimum_height, minimum);
*natural_height = MAX (*natural_height, natural);
}
*minimum_height = 0;
*minimum_height +=
2 * gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1;
*natural_height +=
2 * gtk_container_get_border_width (GTK_CONTAINER (widget)) + 1;
}
static void
pika_overlay_box_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GList *list;
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
for (list = box->children; list; list = g_list_next (list))
pika_overlay_child_size_allocate (box, list->data);
}
static gboolean
pika_overlay_box_draw (GtkWidget *widget,
cairo_t *cr)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GList *list;
for (list = box->children; list; list = g_list_next (list))
{
if (pika_overlay_child_draw (box, list->data, cr))
return FALSE;
}
return FALSE;
}
static gboolean
pika_overlay_box_damage (GtkWidget *widget,
GdkEventExpose *event)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (widget);
GList *list;
for (list = box->children; list; list = g_list_next (list))
{
if (pika_overlay_child_damage (box, list->data, event))
return FALSE;
}
return FALSE;
}
static void
pika_overlay_box_add (GtkContainer *container,
GtkWidget *widget)
{
pika_overlay_box_add_child (PIKA_OVERLAY_BOX (container), widget, 0.5, 0.5);
}
static void
pika_overlay_box_remove (GtkContainer *container,
GtkWidget *widget)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (container);
PikaOverlayChild *child = pika_overlay_child_find (box, widget);
if (child)
{
if (gtk_widget_get_visible (widget))
pika_overlay_child_invalidate (box, child);
box->children = g_list_remove (box->children, child);
pika_overlay_child_free (box, child);
}
}
static void
pika_overlay_box_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
PikaOverlayBox *box = PIKA_OVERLAY_BOX (container);
GList *list;
list = box->children;
while (list)
{
PikaOverlayChild *child = list->data;
list = list->next;
(* callback) (child->widget, callback_data);
}
}
static GType
pika_overlay_box_child_type (GtkContainer *container)
{
return GTK_TYPE_WIDGET;
}
static GdkWindow *
pika_overlay_box_pick_embedded_child (GdkWindow *parent,
gdouble parent_x,
gdouble parent_y,
PikaOverlayBox *box)
{
GList *list;
for (list = box->children; list; list = g_list_next (list))
{
PikaOverlayChild *child = list->data;
if (pika_overlay_child_pick (box, child, parent_x, parent_y))
return child->window;
}
return NULL;
}
/* public functions */
/**
* pika_overlay_box_new:
*
* Creates a new #PikaOverlayBox widget.
*
* Returns: a new #PikaOverlayBox widget
**/
GtkWidget *
pika_overlay_box_new (void)
{
return g_object_new (PIKA_TYPE_OVERLAY_BOX, NULL);
}
void
pika_overlay_box_add_child (PikaOverlayBox *box,
GtkWidget *widget,
gdouble xalign,
gdouble yalign)
{
PikaOverlayChild *child;
g_return_if_fail (PIKA_IS_OVERLAY_BOX (box));
g_return_if_fail (GTK_IS_WIDGET (widget));
child = pika_overlay_child_new (box, widget, xalign, yalign, 0.0, 0.85);
box->children = g_list_append (box->children, child);
}
void
pika_overlay_box_set_child_alignment (PikaOverlayBox *box,
GtkWidget *widget,
gdouble xalign,
gdouble yalign)
{
PikaOverlayChild *child = pika_overlay_child_find (box, widget);
if (child)
{
xalign = CLAMP (xalign, 0.0, 1.0);
yalign = CLAMP (yalign, 0.0, 1.0);
if (child->has_position ||
child->xalign != xalign ||
child->yalign != yalign)
{
pika_overlay_child_invalidate (box, child);
child->has_position = FALSE;
child->xalign = xalign;
child->yalign = yalign;
gtk_widget_queue_resize (widget);
}
}
}
void
pika_overlay_box_set_child_position (PikaOverlayBox *box,
GtkWidget *widget,
gdouble x,
gdouble y)
{
PikaOverlayChild *child = pika_overlay_child_find (box, widget);
if (child)
{
if (! child->has_position ||
child->x != x ||
child->y != y)
{
pika_overlay_child_invalidate (box, child);
child->has_position = TRUE;
child->x = x;
child->y = y;
gtk_widget_queue_resize (widget);
}
}
}
void
pika_overlay_box_set_child_angle (PikaOverlayBox *box,
GtkWidget *widget,
gdouble angle)
{
PikaOverlayChild *child = pika_overlay_child_find (box, widget);
if (child)
{
if (child->angle != angle)
{
pika_overlay_child_invalidate (box, child);
child->angle = angle;
gtk_widget_queue_draw (widget);
}
}
}
void
pika_overlay_box_set_child_opacity (PikaOverlayBox *box,
GtkWidget *widget,
gdouble opacity)
{
PikaOverlayChild *child = pika_overlay_child_find (box, widget);
if (child)
{
opacity = CLAMP (opacity, 0.0, 1.0);
if (child->opacity != opacity)
{
child->opacity = opacity;
gtk_widget_queue_draw (widget);
}
}
}
/**
* pika_overlay_box_scroll:
* @box: the #PikaOverlayBox widget to scroll.
* @offset_x: the x scroll amount.
* @offset_y: the y scroll amount.
*
* Scrolls the box using gdk_window_scroll(), taking care of properly
* handling overlay children.
**/
void
pika_overlay_box_scroll (PikaOverlayBox *box,
gint offset_x,
gint offset_y)
{
GtkWidget *widget;
GdkWindow *window;
GList *list;
g_return_if_fail (PIKA_IS_OVERLAY_BOX (box));
widget = GTK_WIDGET (box);
/* bug 761118 */
if (! gtk_widget_get_realized (widget))
return;
window = gtk_widget_get_window (widget);
/* Undraw all overlays */
for (list = box->children; list; list = g_list_next (list))
{
PikaOverlayChild *child = list->data;
pika_overlay_child_invalidate (box, child);
}
gdk_window_scroll (window, offset_x, offset_y);
/* Re-draw all overlays */
for (list = box->children; list; list = g_list_next (list))
{
PikaOverlayChild *child = list->data;
pika_overlay_child_invalidate (box, child);
}
}