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mutter/clutter/clutter-label.c
Emmanuele Bassi 9955b06542 2007-11-20 Emmanuele Bassi <ebassi@openedhand.com> 
* clutter/clutter-actor.c::
	* clutter/clutter-behaviour-opacity.c:
	* clutter/clutter-clone-texture.c:
	* clutter/clutter-effect.c:
	* clutter/clutter-label.c: Remove the usage of G_PARAM_CONSTRUCT
	without an override for the ::construct virtual function; using
	G_PARAM_CONSTRUCT to set the default value of a property is not
	the recommended approach; default values are set inside the
	instance init function.
2007-11-20 16:05:56 +00:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:clutter-label
* @short_description: Actor for displaying text
*
* #ClutterLabel is a #ClutterActor that displays text using Pango.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-label.h"
#include "clutter-layout.h"
#include "clutter-main.h"
#include "clutter-enum-types.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include "clutter-units.h"
#include "pangoclutter.h"
#define DEFAULT_FONT_NAME "Sans 10"
static void clutter_layout_iface_init (ClutterLayoutIface *iface);
G_DEFINE_TYPE_WITH_CODE (ClutterLabel,
clutter_label,
CLUTTER_TYPE_ACTOR,
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_LAYOUT,
clutter_layout_iface_init));
/* Probably move into main */
static PangoClutterFontMap *_font_map = NULL;
static PangoContext *_context = NULL;
enum
{
PROP_0,
PROP_FONT_NAME,
PROP_TEXT,
PROP_COLOR,
PROP_ATTRIBUTES,
PROP_USE_MARKUP,
PROP_ALIGNMENT,
PROP_WRAP,
PROP_WRAP_MODE,
PROP_JUSTIFY,
PROP_ELLIPSIZE,
PROP_LAYOUT_FLAGS
};
#define CLUTTER_LABEL_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), CLUTTER_TYPE_LABEL, ClutterLabelPrivate))
struct _ClutterLabelPrivate
{
PangoContext *context;
PangoFontDescription *font_desc;
ClutterColor fgcol;
ClutterActorBox allocation;
gchar *text;
gchar *font_name;
gint extents_width;
gint extents_height;
guint alignment : 2;
guint wrap : 1;
guint use_underline : 1;
guint use_markup : 1;
guint ellipsize : 3;
guint single_line_mode : 1;
guint wrap_mode : 3;
guint justify : 1;
PangoAttrList *attrs;
PangoAttrList *effective_attrs;
PangoLayout *layout;
gint width_chars;
gint wrap_width;
};
static gint
get_label_char_width (ClutterLabel *label)
{
ClutterLabelPrivate *priv = label->priv;
PangoContext *context;
PangoFontMetrics *metrics;
gint char_width, digit_width, char_pixels, w;
context = pango_layout_get_context (priv->layout);
metrics = pango_context_get_metrics (context, priv->font_desc,
pango_context_get_language (context));
char_width = pango_font_metrics_get_approximate_char_width (metrics);
digit_width = pango_font_metrics_get_approximate_digit_width (metrics);
char_pixels = MAX (char_width, digit_width);
pango_font_metrics_unref (metrics);
if (priv->width_chars < 0)
{
PangoRectangle rect;
pango_layout_set_width (priv->layout, -1);
pango_layout_get_extents (priv->layout, NULL, &rect);
w = char_pixels * 5;
w = MIN (rect.width, w);
}
else
{
/* enforce minimum width for ellipsized labels at ~5 chars */
w = char_pixels * MAX (priv->width_chars, 5);
}
return w;
}
static gint
get_label_wrap_width (ClutterLabel *label)
{
ClutterLabelPrivate *priv = label->priv;
if (priv->wrap_width < 0)
{
if (priv->width_chars > 0)
priv->wrap_width = get_label_char_width (label);
else
{
PangoLayout *tmp;
tmp = pango_layout_new (_context);
pango_layout_set_font_description (tmp, priv->font_desc);
pango_layout_set_text (tmp, "This is a very long string, which "
"should be enough for a wrap width.",
-1);
pango_layout_get_size (tmp, &priv->wrap_width, NULL);
g_object_unref (tmp);
}
}
return priv->wrap_width;
}
static void
clutter_label_ensure_layout (ClutterLabel *label)
{
ClutterLabelPrivate *priv;
gint width;
priv = label->priv;
/* use the last size requested, if any */
width = CLUTTER_UNITS_TO_INT (priv->allocation.x2 - priv->allocation.x1);
if (!priv->layout)
{
priv->layout = pango_layout_new (_context);
if (priv->effective_attrs)
pango_layout_set_attributes (priv->layout, priv->effective_attrs);
pango_layout_set_alignment (priv->layout, priv->alignment);
pango_layout_set_ellipsize (priv->layout, priv->ellipsize);
pango_layout_set_single_paragraph_mode (priv->layout,
priv->single_line_mode);
pango_layout_set_font_description (priv->layout, priv->font_desc);
pango_layout_set_justify (priv->layout, priv->justify);
if (priv->text)
{
if (!priv->use_markup)
pango_layout_set_text (priv->layout, priv->text, -1);
else
pango_layout_set_markup (priv->layout, priv->text, -1);
}
if (priv->ellipsize)
pango_layout_set_width (priv->layout, width > 0 ? width * PANGO_SCALE
: -1);
else if (priv->wrap)
{
pango_layout_set_wrap (priv->layout, priv->wrap_mode);
if (width > 0)
pango_layout_set_width (priv->layout, width * PANGO_SCALE);
else
{
/* this was adapted from the GtkLabel code */
ClutterActor *stage = clutter_stage_get_default ();
gint stage_width = clutter_actor_get_width (stage);
gint longest_paragraph, height, wrap_width;
PangoRectangle logical_rect;
pango_layout_set_width (priv->layout, -1);
pango_layout_get_extents (priv->layout, NULL, &logical_rect);
width = logical_rect.width;
longest_paragraph = width;
wrap_width = get_label_wrap_width (label);
width = MAX (width, wrap_width);
width = MIN (width, PANGO_SCALE * (stage_width + 1) / 2);
pango_layout_set_width (priv->layout, width);
pango_layout_get_extents (priv->layout, NULL, &logical_rect);
width = logical_rect.width;
height = logical_rect.height;
if (longest_paragraph > 0)
{
gint n_lines, perfect_width;
n_lines = pango_layout_get_line_count (priv->layout);
perfect_width = (longest_paragraph + n_lines - 1) / n_lines;
if (perfect_width < width)
{
pango_layout_set_width (priv->layout, perfect_width);
pango_layout_get_extents (priv->layout, NULL,
&logical_rect);
if (logical_rect.height <= height)
width = logical_rect.width = width;
else
{
gint mid_width = (perfect_width + width) / 2;
if (mid_width > perfect_width)
{
pango_layout_set_width (priv->layout, mid_width);
pango_layout_get_extents (priv->layout, NULL,
&logical_rect);
if (logical_rect.height <= height);
width = logical_rect.width;
}
}
}
}
pango_layout_set_width (priv->layout, width);
}
}
else
pango_layout_set_width (priv->layout, -1);
}
CLUTTER_NOTE (ACTOR, "Label width set to %d pixels", width);
}
static void
clutter_label_clear_layout (ClutterLabel *label)
{
if (label->priv->layout)
{
g_object_unref (label->priv->layout);
label->priv->layout = NULL;
}
}
static void
clutter_label_paint (ClutterActor *self)
{
ClutterLabel *label = CLUTTER_LABEL (self);
ClutterLabelPrivate *priv = label->priv;
if (priv->font_desc == NULL || priv->text == NULL)
{
CLUTTER_NOTE (ACTOR, "layout: %p, desc: %p, text %p",
priv->layout,
priv->font_desc ? priv->font_desc : 0x0,
priv->text ? priv->text : 0x0);
return;
}
CLUTTER_NOTE (PAINT, "painting label (text:`%s')", priv->text);
clutter_label_ensure_layout (label);
priv->fgcol.alpha = clutter_actor_get_opacity (self);
pango_clutter_render_layout (priv->layout, 0, 0, &priv->fgcol, 0);
}
static void
clutter_label_query_coords (ClutterActor *self,
ClutterActorBox *box)
{
ClutterLabel *label = CLUTTER_LABEL(self);
ClutterLabelPrivate *priv;
PangoRectangle logical_rect;
priv = label->priv;
if (priv->wrap)
clutter_label_clear_layout (label);
clutter_label_ensure_layout (label);
pango_layout_get_extents (priv->layout, NULL, &logical_rect);
box->x2 = box->x1 + CLUTTER_UNITS_FROM_PANGO_UNIT (logical_rect.width);
box->y2 = box->y1 + CLUTTER_UNITS_FROM_PANGO_UNIT (logical_rect.height);
return;
}
static void
clutter_label_request_coords (ClutterActor *self,
ClutterActorBox *box)
{
ClutterLabel *label = CLUTTER_LABEL (self);
ClutterLabelPrivate *priv = label->priv;
if (priv->ellipsize)
{
if (priv->layout)
{
gint width;
PangoRectangle logical;
width = CLUTTER_UNITS_TO_INT (box->x2 - box->x1) * PANGO_SCALE;
pango_layout_set_width (priv->layout, -1);
pango_layout_get_extents (priv->layout, NULL, &logical);
if (logical.width > width)
pango_layout_set_width (priv->layout, width);
}
}
else
clutter_label_clear_layout (label);
priv->allocation = *box;
}
static void
clutter_label_dispose (GObject *object)
{
ClutterLabel *self = CLUTTER_LABEL(object);
ClutterLabelPrivate *priv;
priv = self->priv;
if (priv->layout)
{
g_object_unref (priv->layout);
priv->layout = NULL;
}
if (priv->context)
{
g_object_unref (priv->context);
priv->context = NULL;
}
G_OBJECT_CLASS (clutter_label_parent_class)->dispose (object);
}
static void
clutter_label_finalize (GObject *object)
{
ClutterLabel *self = CLUTTER_LABEL(object);
ClutterLabelPrivate *priv;
priv = self->priv;
if (priv->font_desc)
pango_font_description_free (priv->font_desc);
g_free (priv->text);
g_free (priv->font_name);
G_OBJECT_CLASS (clutter_label_parent_class)->finalize (object);
}
static ClutterLayoutFlags
clutter_label_get_layout_flags (ClutterLayout *layout)
{
ClutterLayoutFlags flags;
ClutterFixed angle;
flags = CLUTTER_LAYOUT_NATURAL;
angle = clutter_actor_get_rotationx (CLUTTER_ACTOR (layout),
CLUTTER_Z_AXIS,
NULL, NULL, NULL);
if (angle == 0 || angle == CLUTTER_INT_TO_FIXED (180))
flags |= CLUTTER_LAYOUT_HEIGHT_FOR_WIDTH;
else if (angle == CLUTTER_INT_TO_FIXED (90) || angle == CLUTTER_INT_TO_FIXED (270))
flags |= CLUTTER_LAYOUT_WIDTH_FOR_HEIGHT;
return flags;
}
static void
clutter_label_width_for_height (ClutterLayout *layout,
ClutterUnit *width,
ClutterUnit height)
{
ClutterLabel *label = CLUTTER_LABEL (layout);
PangoLayout *tmp;
gint layout_height;
clutter_label_ensure_layout (label);
tmp = pango_layout_copy (label->priv->layout);
pango_layout_set_width (tmp, CLUTTER_UNITS_TO_PANGO_UNIT (height));
pango_layout_get_pixel_size (tmp, NULL, &layout_height);
if (width)
*width = CLUTTER_UNITS_FROM_INT (layout_height);
g_object_unref (tmp);
}
static void
clutter_label_height_for_width (ClutterLayout *layout,
ClutterUnit width,
ClutterUnit *height)
{
ClutterLabel *label = CLUTTER_LABEL (layout);
PangoLayout *tmp;
gint layout_height;
clutter_label_ensure_layout (label);
tmp = pango_layout_copy (label->priv->layout);
pango_layout_set_width (tmp, CLUTTER_UNITS_TO_PANGO_UNIT (width));
pango_layout_get_pixel_size (tmp, NULL, &layout_height);
if (height)
*height = CLUTTER_UNITS_FROM_INT (layout_height);
g_object_unref (tmp);
}
static void
clutter_label_natural_request (ClutterLayout *layout,
ClutterUnit *width,
ClutterUnit *height)
{
ClutterLabel *label = CLUTTER_LABEL (layout);
PangoLayout *tmp;
PangoRectangle logical_rect = { 0, };
clutter_label_ensure_layout (label);
tmp = pango_layout_copy (label->priv->layout);
pango_layout_set_width (tmp, -1);
pango_layout_set_ellipsize (tmp, PANGO_ELLIPSIZE_NONE);
pango_layout_get_extents (tmp, NULL, &logical_rect);
if (width)
*width = CLUTTER_UNITS_FROM_PANGO_UNIT (logical_rect.width);
if (height)
*height = CLUTTER_UNITS_FROM_PANGO_UNIT (logical_rect.height);
g_object_unref (tmp);
}
static void
clutter_layout_iface_init (ClutterLayoutIface *iface)
{
iface->get_layout_flags = clutter_label_get_layout_flags;
iface->height_for_width = clutter_label_height_for_width;
iface->width_for_height = clutter_label_width_for_height;
iface->natural_request = clutter_label_natural_request;
}
static void
clutter_label_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterLabel *label;
ClutterLabelPrivate *priv;
label = CLUTTER_LABEL(object);
priv = label->priv;
switch (prop_id)
{
case PROP_FONT_NAME:
clutter_label_set_font_name (label, g_value_get_string (value));
break;
case PROP_TEXT:
clutter_label_set_text (label, g_value_get_string (value));
break;
case PROP_COLOR:
clutter_label_set_color (label, g_value_get_boxed (value));
break;
case PROP_ATTRIBUTES:
clutter_label_set_attributes (label, g_value_get_boxed (value));
break;
case PROP_ALIGNMENT:
clutter_label_set_alignment (label, g_value_get_enum (value));
break;
case PROP_USE_MARKUP:
clutter_label_set_use_markup (label, g_value_get_boolean (value));
break;
case PROP_WRAP:
clutter_label_set_line_wrap (label, g_value_get_boolean (value));
break;
case PROP_JUSTIFY:
clutter_label_set_justify (label, g_value_get_boolean (value));
break;
case PROP_WRAP_MODE:
clutter_label_set_line_wrap_mode (label, g_value_get_enum (value));
break;
case PROP_ELLIPSIZE:
clutter_label_set_ellipsize (label, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_label_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterLabel *label;
ClutterLabelPrivate *priv;
ClutterColor color;
label = CLUTTER_LABEL (object);
priv = label->priv;
switch (prop_id)
{
case PROP_FONT_NAME:
g_value_set_string (value, priv->font_name);
break;
case PROP_TEXT:
g_value_set_string (value, priv->text);
break;
case PROP_COLOR:
clutter_label_get_color (label, &color);
g_value_set_boxed (value, &color);
break;
case PROP_ATTRIBUTES:
g_value_set_boxed (value, priv->attrs);
break;
case PROP_ALIGNMENT:
g_value_set_enum (value, priv->alignment);
break;
case PROP_USE_MARKUP:
g_value_set_boolean (value, priv->use_markup);
break;
case PROP_JUSTIFY:
g_value_set_boolean (value, priv->justify);
break;
case PROP_WRAP:
g_value_set_boolean (value, priv->wrap);
break;
case PROP_WRAP_MODE:
g_value_set_enum (value, priv->wrap_mode);
break;
case PROP_ELLIPSIZE:
g_value_set_enum (value, priv->ellipsize);
break;
case PROP_LAYOUT_FLAGS:
g_value_set_flags (value,
clutter_label_get_layout_flags (CLUTTER_LAYOUT (label)));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
clutter_label_class_init (ClutterLabelClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
ClutterActorClass *actor_class = CLUTTER_ACTOR_CLASS (klass);
actor_class->paint = clutter_label_paint;
actor_class->request_coords = clutter_label_request_coords;
actor_class->query_coords = clutter_label_query_coords;
gobject_class->finalize = clutter_label_finalize;
gobject_class->dispose = clutter_label_dispose;
gobject_class->set_property = clutter_label_set_property;
gobject_class->get_property = clutter_label_get_property;
g_object_class_install_property
(gobject_class, PROP_FONT_NAME,
g_param_spec_string ("font-name",
"Font Name",
"Pango font description",
NULL,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_TEXT,
g_param_spec_string ("text",
"Text",
"Text to render",
NULL,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_COLOR,
g_param_spec_boxed ("color",
"Font Colour",
"Font Colour",
CLUTTER_TYPE_COLOR,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_ATTRIBUTES,
g_param_spec_boxed ("attributes",
"Attributes",
"A list of style attributes to apply to the"
"text of the label",
PANGO_TYPE_ATTR_LIST,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_USE_MARKUP,
g_param_spec_boolean ("use-markup",
"Use markup",
"The text of the label includes XML markup."
"See pango_parse_markup()",
FALSE,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_WRAP,
g_param_spec_boolean ("wrap",
"Line wrap",
"If set, wrap lines if the text becomes too wide",
FALSE,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_WRAP_MODE,
g_param_spec_enum ("wrap-mode",
"Line wrap mode",
"If wrap is set, controls how linewrapping is done",
PANGO_TYPE_WRAP_MODE,
PANGO_WRAP_WORD,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_ELLIPSIZE,
g_param_spec_enum ( "ellipsize",
"Ellipsize",
"The preferred place to ellipsize the string,"
"if the label does not have enough room to "
"display the entire string",
PANGO_TYPE_ELLIPSIZE_MODE,
PANGO_ELLIPSIZE_NONE,
CLUTTER_PARAM_READWRITE));
g_object_class_install_property
(gobject_class, PROP_ALIGNMENT,
g_param_spec_enum ( "alignment",
"Alignment",
"The preferred alignment for the string",
PANGO_TYPE_ALIGNMENT,
PANGO_ALIGN_LEFT,
CLUTTER_PARAM_READWRITE));
/**
* ClutterLabel:justify:
*
* Whether the contents of the label should be justified on both
* margins.
*
* Since: 0.6
*/
g_object_class_install_property (gobject_class,
PROP_JUSTIFY,
g_param_spec_boolean ("justify",
"Justify",
"Whether the contents of the label should be justified",
FALSE,
CLUTTER_PARAM_READWRITE));
g_object_class_override_property (gobject_class,
PROP_LAYOUT_FLAGS,
"layout-flags");
g_type_class_add_private (gobject_class, sizeof (ClutterLabelPrivate));
}
static void
clutter_label_init (ClutterLabel *self)
{
ClutterLabelPrivate *priv;
self->priv = priv = CLUTTER_LABEL_GET_PRIVATE (self);
if (G_UNLIKELY (_context == NULL))
{
ClutterBackend *backend;
gdouble resolution;
backend = clutter_get_default_backend ();
resolution = clutter_backend_get_resolution (backend);
if (resolution < 0)
resolution = 96.0;
_font_map = PANGO_CLUTTER_FONT_MAP (pango_clutter_font_map_new ());
pango_clutter_font_map_set_resolution (_font_map, resolution);
_context = pango_clutter_font_map_create_context (_font_map);
}
priv->alignment = PANGO_ALIGN_LEFT;
priv->wrap = FALSE;
priv->wrap_mode = PANGO_WRAP_WORD;
priv->ellipsize = PANGO_ELLIPSIZE_NONE;
priv->use_underline = FALSE;
priv->use_markup = FALSE;
priv->justify = FALSE;
priv->layout = NULL;
priv->text = NULL;
priv->attrs = NULL;
priv->width_chars = -1;
priv->wrap_width = -1;
priv->fgcol.red = 0;
priv->fgcol.green = 0;
priv->fgcol.blue = 0;
priv->fgcol.alpha = 255;
priv->font_name = g_strdup (DEFAULT_FONT_NAME);
priv->font_desc = pango_font_description_from_string (priv->font_name);
CLUTTER_MARK();
}
/**
* clutter_label_new_with_text:
* @font_name: the name (and size) of the font to be used
* @text: the text to be displayed
*
* Creates a new #ClutterLabel displaying @text using @font_name.
*
* Return value: a #ClutterLabel
*/
ClutterActor*
clutter_label_new_with_text (const gchar *font_name,
const gchar *text)
{
return g_object_new (CLUTTER_TYPE_LABEL,
"font-name", font_name,
"text", text,
NULL);
}
/**
* clutter_label_new_full:
* @font_name: the name (and size) of the font to be used
* @text: the text to be displayed
* @color: #ClutterColor for text
*
* Creates a new #ClutterLabel displaying @text with color @color
* using @font_name.
*
* Return value: a #ClutterLabel
*/
ClutterActor*
clutter_label_new_full (const gchar *font_name,
const gchar *text,
const ClutterColor *color)
{
return g_object_new (CLUTTER_TYPE_LABEL,
"font-name", font_name,
"text", text,
"color", color);
}
/**
* clutter_label_new:
*
* Creates a new, empty #ClutterLabel.
*
* Returns: the newly created #ClutterLabel
*/
ClutterActor *
clutter_label_new (void)
{
return g_object_new (CLUTTER_TYPE_LABEL, NULL);
}
/**
* clutter_label_get_text:
* @label: a #ClutterLabel
*
* Retrieves the text displayed by @label
*
* Return value: the text of the label. The returned string is
* owned by #ClutterLabel and should not be modified or freed.
*/
G_CONST_RETURN gchar *
clutter_label_get_text (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), NULL);
return label->priv->text;
}
/**
* clutter_label_set_text:
* @label: a #ClutterLabel
* @text: the text to be displayed
*
* Sets @text as the text to be displayed by @label.
*/
void
clutter_label_set_text (ClutterLabel *label,
const gchar *text)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
priv = label->priv;
g_object_ref (label);
g_free (priv->text);
priv->text = g_strdup (text);
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR(label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR(label));
g_object_notify (G_OBJECT (label), "text");
g_object_unref (label);
}
/**
* clutter_label_get_font_name:
* @label: a #ClutterLabel
*
* Retrieves the font used by @label.
*
* Return value: a string containing the font name, in a format
* understandable by pango_font_description_from_string(). The
* string is owned by #ClutterLabel and should not be modified
* or freed.
*/
G_CONST_RETURN gchar *
clutter_label_get_font_name (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), NULL);
return label->priv->font_name;
}
/**
* clutter_label_set_font_name:
* @label: a #ClutterLabel
* @font_name: a font name and size, or %NULL for the default font
*
* Sets @font_name as the font used by @label.
*
* @font_name must be a string containing the font name and its
* size, similarly to what you would feed to the
* pango_font_description_from_string() function.
*/
void
clutter_label_set_font_name (ClutterLabel *label,
const gchar *font_name)
{
ClutterLabelPrivate *priv;
PangoFontDescription *desc;
g_return_if_fail (CLUTTER_IS_LABEL (label));
if (!font_name || font_name[0] == '\0')
font_name = DEFAULT_FONT_NAME;
priv = label->priv;
if (strcmp (priv->font_name, font_name) == 0)
return;
desc = pango_font_description_from_string (font_name);
if (!desc)
{
g_warning ("Attempting to create a PangoFontDescription for "
"font name `%s', but failed.",
font_name);
return;
}
g_object_ref (label);
g_free (priv->font_name);
priv->font_name = g_strdup (font_name);
if (priv->font_desc)
pango_font_description_free (priv->font_desc);
priv->font_desc = desc;
priv->wrap_width = -1;
if (label->priv->text && label->priv->text[0] != '\0')
{
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (label))
clutter_actor_queue_redraw (CLUTTER_ACTOR (label));
}
g_object_notify (G_OBJECT (label), "font-name");
g_object_unref (label);
}
/**
* clutter_label_set_color:
* @label: a #ClutterLabel
* @color: a #ClutterColor
*
* Sets the color of @label.
*/
void
clutter_label_set_color (ClutterLabel *label,
const ClutterColor *color)
{
ClutterActor *actor;
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
g_return_if_fail (color != NULL);
priv = label->priv;
g_object_ref (label);
priv->fgcol.red = color->red;
priv->fgcol.green = color->green;
priv->fgcol.blue = color->blue;
priv->fgcol.alpha = color->alpha;
actor = CLUTTER_ACTOR (label);
clutter_actor_set_opacity (actor, priv->fgcol.alpha);
if (CLUTTER_ACTOR_IS_VISIBLE (actor))
clutter_actor_queue_redraw (actor);
g_object_notify (G_OBJECT (label), "color");
g_object_unref (label);
}
/**
* clutter_label_get_color:
* @label: a #ClutterLabel
* @color: return location for a #ClutterColor
*
* Retrieves the color of @label.
*/
void
clutter_label_get_color (ClutterLabel *label,
ClutterColor *color)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
g_return_if_fail (color != NULL);
priv = label->priv;
color->red = priv->fgcol.red;
color->green = priv->fgcol.green;
color->blue = priv->fgcol.blue;
color->alpha = priv->fgcol.alpha;
}
/**
* clutter_label_set_ellipsize:
* @label: a #ClutterLabel
* @mode: a #PangoEllipsizeMode
*
* Sets the mode used to ellipsize (add an ellipsis: "...") to the text
* if there is not enough space to render the entire string.
*
* Since: 0.2
**/
void
clutter_label_set_ellipsize (ClutterLabel *label,
PangoEllipsizeMode mode)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
g_return_if_fail (mode >= PANGO_ELLIPSIZE_NONE &&
mode <= PANGO_ELLIPSIZE_END);
priv = label->priv;
if ((PangoEllipsizeMode) priv->ellipsize != mode)
{
g_object_ref (label);
priv->ellipsize = mode;
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR(label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR(label));
g_object_notify (G_OBJECT (label), "ellipsize");
g_object_unref (label);
}
}
/**
* clutter_label_get_ellipsize:
* @label: a #ClutterLabel
*
* Returns the ellipsizing position of the label.
* See clutter_label_set_ellipsize().
*
* Return value: #PangoEllipsizeMode
*
* Since: 0.2
**/
PangoEllipsizeMode
clutter_label_get_ellipsize (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), PANGO_ELLIPSIZE_NONE);
return label->priv->ellipsize;
}
/**
* clutter_label_set_line_wrap:
* @label: a #ClutterLabel
* @wrap: the setting
*
* Toggles line wrapping within the #ClutterLabel widget. %TRUE makes
* it break lines if text exceeds the widget's size. %FALSE lets the
* text get cut off by the edge of the widget if it exceeds the widget
* size.
*
* Since: 0.2
*/
void
clutter_label_set_line_wrap (ClutterLabel *label,
gboolean wrap)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
priv = label->priv;
wrap = wrap != FALSE;
if (priv->wrap != wrap)
{
g_object_ref (label);
priv->wrap = wrap;
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR (label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR (label));
g_object_notify (G_OBJECT (label), "wrap");
g_object_unref (label);
}
}
/**
* clutter_label_get_line_wrap:
* @label: a #ClutterLabel
*
* Returns whether lines in the label are automatically wrapped.
* See clutter_label_set_line_wrap ().
*
* Return value: %TRUE if the lines of the label are automatically wrapped.
*
* Since: 0.2
*/
gboolean
clutter_label_get_line_wrap (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), FALSE);
return label->priv->wrap;
}
/**
* clutter_label_set_line_wrap_mode:
* @label: a #ClutterLabel
* @wrap_mode: the line wrapping mode
*
* If line wrapping is on (see clutter_label_set_line_wrap()) this controls how
* the line wrapping is done. The default is %PANGO_WRAP_WORD which means
* wrap on word boundaries.
*
* Since: 0.2
**/
void
clutter_label_set_line_wrap_mode (ClutterLabel *label,
PangoWrapMode wrap_mode)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
priv = label->priv;
if (priv->wrap_mode != wrap_mode)
{
g_object_ref (label);
priv->wrap_mode = wrap_mode;
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR (label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR (label));
g_object_notify (G_OBJECT (label), "wrap-mode");
g_object_unref (label);
}
}
/**
* clutter_label_get_line_wrap_mode:
* @label: a #ClutterLabel
*
* Returns line wrap mode used by the label.
* See clutter_label_set_line_wrap_mode ().
*
* Return value: %TRUE if the lines of the label are automatically wrapped.
*
* Since: 0.2
*/
PangoWrapMode
clutter_label_get_line_wrap_mode (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), FALSE);
return label->priv->wrap_mode;
}
/**
* clutter_label_get_layout:
* @label: a #ClutterLabel
*
* Gets the #PangoLayout used to display the label.
* The layout is useful to e.g. convert text positions to
* pixel positions.
* The returned layout is owned by the label so need not be
* freed by the caller.
*
* Return value: the #PangoLayout for this label
*
* Since: 0.2
**/
PangoLayout*
clutter_label_get_layout (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), NULL);
clutter_label_ensure_layout (label);
return label->priv->layout;
}
static inline void
clutter_label_set_attributes_internal (ClutterLabel *label,
PangoAttrList *attrs)
{
ClutterLabelPrivate *priv;
priv = label->priv;
g_object_ref (label);
if (attrs)
pango_attr_list_ref (attrs);
if (priv->attrs)
pango_attr_list_unref (priv->attrs);
if (!priv->use_markup)
{
if (attrs)
pango_attr_list_ref (attrs);
if (priv->effective_attrs)
pango_attr_list_unref (priv->effective_attrs);
priv->effective_attrs = attrs;
}
label->priv->attrs = attrs;
g_object_notify (G_OBJECT (label), "attributes");
g_object_unref (label);
}
/**
* clutter_label_set_attributes:
* @label: a #ClutterLabel
* @attrs: a #PangoAttrList
*
* Sets a #PangoAttrList; the attributes in the list are applied to the
* label text. The attributes set with this function will be ignored
* if the "use_markup" property
* is %TRUE.
*
* Since: 0.2
**/
void
clutter_label_set_attributes (ClutterLabel *label,
PangoAttrList *attrs)
{
g_return_if_fail (CLUTTER_IS_LABEL (label));
clutter_label_set_attributes_internal (label, attrs);
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR(label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR(label));
}
/**
* clutter_label_get_attributes:
* @label: a #ClutterLabel
*
* Gets the attribute list that was set on the label using
* clutter_label_set_attributes(), if any.
*
* Return value: the attribute list, or %NULL if none was set.
*
* Since: 0.2
**/
PangoAttrList *
clutter_label_get_attributes (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), NULL);
return label->priv->attrs;
}
/**
* clutter_label_set_use_markup:
* @label: a #ClutterLabel
* @setting: %TRUE if the label's text should be parsed for markup.
*
* Sets whether the text of the label contains markup in <link
* linkend="PangoMarkupFormat">Pango's text markup
* language</link>.
**/
void
clutter_label_set_use_markup (ClutterLabel *label,
gboolean setting)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
priv = label->priv;
if (priv->use_markup != setting)
{
g_object_ref (label);
priv->use_markup = setting;
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR (label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR (label));
g_object_notify (G_OBJECT (label), "use-markup");
g_object_unref (label);
}
}
/**
* clutter_label_get_use_markup:
* @label: a #ClutterLabel
*
* Returns whether the label's text is interpreted as marked up with
* the <link linkend="PangoMarkupFormat">Pango text markup
* language</link>. See clutter_label_set_use_markup ().
*
* Return value: %TRUE if the label's text will be parsed for markup.
**/
gboolean
clutter_label_get_use_markup (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), FALSE);
return label->priv->use_markup;
}
/**
* clutter_label_set_alignment:
* @label: a #ClutterLabel
* @alignment: A #PangoAlignment
*
* Sets text alignment of the label.
**/
void
clutter_label_set_alignment (ClutterLabel *label,
PangoAlignment alignment)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
priv = label->priv;
if (priv->alignment != alignment)
{
g_object_ref (label);
priv->alignment = alignment;
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (CLUTTER_ACTOR (label)))
clutter_actor_queue_redraw (CLUTTER_ACTOR (label));
g_object_notify (G_OBJECT (label), "alignment");
g_object_unref (label);
}
}
/**
* clutter_label_get_alignment:
* @label: a #ClutterLabel
*
* Returns the label's text alignment
*
* Return value: The labels #PangoAlignment
*
* Since 0.2
**/
PangoAlignment
clutter_label_get_alignment (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), FALSE);
return label->priv->alignment;
}
/**
* clutter_label_set_justify:
* @label: a #ClutterLabel
* @justify: whether the text should be justified
*
* Sets whether the text of the @label actor should be justified
* on both margins. This setting is ignored if Clutter is compiled
* against Pango &gt; 1.18.
*
* Since: 0.6
*/
void
clutter_label_set_justify (ClutterLabel *label,
gboolean justify)
{
ClutterLabelPrivate *priv;
g_return_if_fail (CLUTTER_IS_LABEL (label));
priv = label->priv;
if (priv->justify != justify)
{
priv->justify = justify;
clutter_label_clear_layout (label);
if (CLUTTER_ACTOR_IS_VISIBLE (label))
clutter_actor_queue_redraw (CLUTTER_ACTOR (label));
g_object_notify (G_OBJECT (label), "justify");
}
}
/**
* clutter_label_get_justify:
* @label: a #ClutterLabel
*
* Retrieves whether the label should justify the text on both margins.
*
* Return value: %TRUE if the text should be justified
*
* Since: 0.6
*/
gboolean
clutter_label_get_justify (ClutterLabel *label)
{
g_return_val_if_fail (CLUTTER_IS_LABEL (label), FALSE);
return label->priv->justify;
}
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