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gtk2/gtk/gtkcellrendererspinner.c
Matthias Clasen 2eae3e8e78 cellrendererspinner: Add a summary
2021-03-11 16:37:37 +00:00

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/* GTK - The GIMP Toolkit
*
* Copyright (C) 2009 Matthias Clasen <mclasen@redhat.com>
* Copyright (C) 2008 Richard Hughes <richard@hughsie.com>
* Copyright (C) 2009 Bastien Nocera <hadess@hadess.net>
*
* 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 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/>.
*/
/*
* Modified by the GTK+ Team and others 2007. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkcellrendererspinner.h"
#include "gtkiconhelperprivate.h"
#include "gtkintl.h"
#include "gtksettings.h"
#include "gtksnapshot.h"
#include "gtktypebuiltins.h"
#include "gtkstylecontextprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include <math.h>
/**
* GtkCellRendererSpinner:
*
* Renders a spinning animation in a cell
*
* GtkCellRendererSpinner renders a spinning animation in a cell, very
* similar to #GtkSpinner. It can often be used as an alternative
* to a #GtkCellRendererProgress for displaying indefinite activity,
* instead of actual progress.
*
* To start the animation in a cell, set the #GtkCellRendererSpinner:active
* property to %TRUE and increment the #GtkCellRendererSpinner:pulse property
* at regular intervals. The usual way to set the cell renderer properties
* for each cell is to bind them to columns in your tree model using e.g.
* gtk_tree_view_column_add_attribute().
*/
enum {
PROP_0,
PROP_ACTIVE,
PROP_PULSE,
PROP_SIZE
};
typedef struct _GtkCellRendererSpinnerClass GtkCellRendererSpinnerClass;
typedef struct _GtkCellRendererSpinnerPrivate GtkCellRendererSpinnerPrivate;
struct _GtkCellRendererSpinner
{
GtkCellRenderer parent;
};
struct _GtkCellRendererSpinnerClass
{
GtkCellRendererClass parent_class;
/* Padding for future expansion */
void (*_gtk_reserved1) (void);
void (*_gtk_reserved2) (void);
void (*_gtk_reserved3) (void);
void (*_gtk_reserved4) (void);
};
struct _GtkCellRendererSpinnerPrivate
{
gboolean active;
guint pulse;
GtkIconSize icon_size;
int size;
};
static void gtk_cell_renderer_spinner_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec);
static void gtk_cell_renderer_spinner_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_cell_renderer_spinner_get_size (GtkCellRendererSpinner *self,
GtkWidget *widget,
const GdkRectangle *cell_area,
int *x_offset,
int *y_offset,
int *width,
int *height);
static void gtk_cell_renderer_spinner_snapshot (GtkCellRenderer *cell,
GtkSnapshot *snapshot,
GtkWidget *widget,
const GdkRectangle *background_area,
const GdkRectangle *cell_area,
GtkCellRendererState flags);
G_DEFINE_TYPE_WITH_PRIVATE (GtkCellRendererSpinner, gtk_cell_renderer_spinner, GTK_TYPE_CELL_RENDERER)
static GtkSizeRequestMode
gtk_cell_renderer_spinner_get_request_mode (GtkCellRenderer *cell)
{
return GTK_SIZE_REQUEST_CONSTANT_SIZE;
}
static void
gtk_cell_renderer_spinner_get_preferred_width (GtkCellRenderer *cell,
GtkWidget *widget,
int *minimum,
int *natural)
{
int size = 0;
gtk_cell_renderer_spinner_get_size (GTK_CELL_RENDERER_SPINNER (cell), widget,
NULL,
NULL, NULL, &size, NULL);
if (minimum != NULL)
*minimum = size;
if (natural != NULL)
*natural = size;
}
static void
gtk_cell_renderer_spinner_get_preferred_height (GtkCellRenderer *cell,
GtkWidget *widget,
int *minimum,
int *natural)
{
int size = 0;
gtk_cell_renderer_spinner_get_size (GTK_CELL_RENDERER_SPINNER (cell), widget,
NULL,
NULL, NULL, NULL, &size);
if (minimum != NULL)
*minimum = size;
if (natural != NULL)
*natural = size;
}
static void
gtk_cell_renderer_spinner_class_init (GtkCellRendererSpinnerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkCellRendererClass *cell_class = GTK_CELL_RENDERER_CLASS (klass);
object_class->get_property = gtk_cell_renderer_spinner_get_property;
object_class->set_property = gtk_cell_renderer_spinner_set_property;
cell_class->get_request_mode = gtk_cell_renderer_spinner_get_request_mode;
cell_class->get_preferred_width = gtk_cell_renderer_spinner_get_preferred_width;
cell_class->get_preferred_height = gtk_cell_renderer_spinner_get_preferred_height;
cell_class->snapshot = gtk_cell_renderer_spinner_snapshot;
/* GtkCellRendererSpinner:active:
*
* Whether the spinner is active (ie. shown) in the cell
*/
g_object_class_install_property (object_class,
PROP_ACTIVE,
g_param_spec_boolean ("active",
P_("Active"),
P_("Whether the spinner is active (ie. shown) in the cell"),
FALSE,
G_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkCellRendererSpinner:pulse:
*
* Pulse of the spinner. Increment this value to draw the next frame of the
* spinner animation. Usually, you would update this value in a timeout.
*
* By default, the #GtkSpinner widget draws one full cycle of the animation,
* consisting of 12 frames, in 750 milliseconds.
*/
g_object_class_install_property (object_class,
PROP_PULSE,
g_param_spec_uint ("pulse",
P_("Pulse"),
P_("Pulse of the spinner"),
0, G_MAXUINT, 0,
G_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkCellRendererSpinner:size:
*
* The #GtkIconSize value that specifies the size of the rendered spinner.
*/
g_object_class_install_property (object_class,
PROP_SIZE,
g_param_spec_enum ("size",
P_("Size"),
P_("The GtkIconSize value that specifies the size of the rendered spinner"),
GTK_TYPE_ICON_SIZE, GTK_ICON_SIZE_INHERIT,
G_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
}
static void
gtk_cell_renderer_spinner_init (GtkCellRendererSpinner *cell)
{
GtkCellRendererSpinnerPrivate *priv = gtk_cell_renderer_spinner_get_instance_private (cell);
priv->pulse = 0;
priv->icon_size = GTK_ICON_SIZE_INHERIT;
}
/**
* gtk_cell_renderer_spinner_new:
*
* Returns a new cell renderer which will show a spinner to indicate
* activity.
*
* Returns: a new #GtkCellRenderer
*/
GtkCellRenderer *
gtk_cell_renderer_spinner_new (void)
{
return g_object_new (GTK_TYPE_CELL_RENDERER_SPINNER, NULL);
}
static void
gtk_cell_renderer_spinner_update_size (GtkCellRendererSpinner *cell,
GtkWidget *widget)
{
GtkCellRendererSpinnerPrivate *priv = gtk_cell_renderer_spinner_get_instance_private (cell);
GtkStyleContext *context;
GtkCssNode *node;
GtkCssStyle *style;
context = gtk_widget_get_style_context (widget);
gtk_style_context_save (context);
gtk_style_context_add_class (context, "spinner");
node = gtk_style_context_get_node (context);
gtk_icon_size_set_style_classes (node, priv->icon_size);
style = gtk_css_node_get_style (node);
priv->size = _gtk_css_number_value_get (style->icon->icon_size, 100);
gtk_style_context_restore (context);
}
static void
gtk_cell_renderer_spinner_get_property (GObject *object,
guint param_id,
GValue *value,
GParamSpec *pspec)
{
GtkCellRendererSpinner *cell = GTK_CELL_RENDERER_SPINNER (object);
GtkCellRendererSpinnerPrivate *priv = gtk_cell_renderer_spinner_get_instance_private (cell);
switch (param_id)
{
case PROP_ACTIVE:
g_value_set_boolean (value, priv->active);
break;
case PROP_PULSE:
g_value_set_uint (value, priv->pulse);
break;
case PROP_SIZE:
g_value_set_enum (value, priv->icon_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
}
}
static void
gtk_cell_renderer_spinner_set_property (GObject *object,
guint param_id,
const GValue *value,
GParamSpec *pspec)
{
GtkCellRendererSpinner *cell = GTK_CELL_RENDERER_SPINNER (object);
GtkCellRendererSpinnerPrivate *priv = gtk_cell_renderer_spinner_get_instance_private (cell);
switch (param_id)
{
case PROP_ACTIVE:
if (priv->active != g_value_get_boolean (value))
{
priv->active = g_value_get_boolean (value);
g_object_notify (object, "active");
}
break;
case PROP_PULSE:
if (priv->pulse != g_value_get_uint (value))
{
priv->pulse = g_value_get_uint (value);
g_object_notify (object, "pulse");
}
break;
case PROP_SIZE:
if (priv->icon_size != g_value_get_enum (value))
{
priv->icon_size = g_value_get_enum (value);
g_object_notify (object, "size");
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
}
}
static void
gtk_cell_renderer_spinner_get_size (GtkCellRendererSpinner *self,
GtkWidget *widget,
const GdkRectangle *cell_area,
int *x_offset,
int *y_offset,
int *width,
int *height)
{
GtkCellRendererSpinnerPrivate *priv = gtk_cell_renderer_spinner_get_instance_private (self);
double align;
int w, h;
int xpad, ypad;
float xalign, yalign;
gboolean rtl;
rtl = gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL;
gtk_cell_renderer_spinner_update_size (self, widget);
g_object_get (self,
"xpad", &xpad,
"ypad", &ypad,
"xalign", &xalign,
"yalign", &yalign,
NULL);
w = h = priv->size;
if (cell_area)
{
if (x_offset)
{
align = rtl ? 1.0 - xalign : xalign;
*x_offset = align * (cell_area->width - w);
*x_offset = MAX (*x_offset, 0);
}
if (y_offset)
{
align = rtl ? 1.0 - yalign : yalign;
*y_offset = align * (cell_area->height - h);
*y_offset = MAX (*y_offset, 0);
}
}
else
{
if (x_offset)
*x_offset = 0;
if (y_offset)
*y_offset = 0;
}
if (width)
*width = w;
if (height)
*height = h;
}
static void
gtk_paint_spinner (GtkStyleContext *context,
cairo_t *cr,
guint step,
int x,
int y,
int width,
int height)
{
GdkRGBA color;
guint num_steps;
double dx, dy;
double radius;
double half;
int i;
guint real_step;
num_steps = 12;
real_step = step % num_steps;
/* set a clip region for the expose event */
cairo_rectangle (cr, x, y, width, height);
cairo_clip (cr);
cairo_translate (cr, x, y);
/* draw clip region */
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
gtk_style_context_get_color (context, &color);
dx = width / 2;
dy = height / 2;
radius = MIN (width / 2, height / 2);
half = num_steps / 2;
for (i = 0; i < num_steps; i++)
{
int inset = 0.7 * radius;
/* transparency is a function of time and initial value */
double t = (double) ((i + num_steps - real_step)
% num_steps) / num_steps;
cairo_save (cr);
cairo_set_source_rgba (cr,
color.red / 65535.,
color.green / 65535.,
color.blue / 65535.,
color.alpha * t);
cairo_set_line_width (cr, 2.0);
cairo_move_to (cr,
dx + (radius - inset) * cos (i * G_PI / half),
dy + (radius - inset) * sin (i * G_PI / half));
cairo_line_to (cr,
dx + radius * cos (i * G_PI / half),
dy + radius * sin (i * G_PI / half));
cairo_stroke (cr);
cairo_restore (cr);
}
}
static void
gtk_cell_renderer_spinner_snapshot (GtkCellRenderer *cell,
GtkSnapshot *snapshot,
GtkWidget *widget,
const GdkRectangle *background_area,
const GdkRectangle *cell_area,
GtkCellRendererState flags)
{
GtkCellRendererSpinner *self = GTK_CELL_RENDERER_SPINNER (cell);
GtkCellRendererSpinnerPrivate *priv = gtk_cell_renderer_spinner_get_instance_private (self);
GdkRectangle pix_rect;
GdkRectangle draw_rect;
int xpad, ypad;
cairo_t *cr;
if (!priv->active)
return;
gtk_cell_renderer_spinner_get_size (self, widget, cell_area,
&pix_rect.x,
&pix_rect.y,
&pix_rect.width,
&pix_rect.height);
g_object_get (self,
"xpad", &xpad,
"ypad", &ypad,
NULL);
pix_rect.x += cell_area->x + xpad;
pix_rect.y += cell_area->y + ypad;
pix_rect.width -= xpad * 2;
pix_rect.height -= ypad * 2;
if (!gdk_rectangle_intersect (cell_area, &pix_rect, &draw_rect))
return;
cr = gtk_snapshot_append_cairo (snapshot,
&GRAPHENE_RECT_INIT (
cell_area->x, cell_area->y,
cell_area->width, cell_area->height
));
gtk_paint_spinner (gtk_widget_get_style_context (widget),
cr,
priv->pulse,
draw_rect.x, draw_rect.y,
draw_rect.width, draw_rect.height);
cairo_destroy (cr);
}
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