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gtk2/gtk/gtklabel.c
Federico Mena Quintero 80581c3011 Fixes #136082 and #135265, patch by Morten Welinder. 
2004-03-05  Federico Mena Quintero  <federico@ximian.com>

	Fixes #136082 and #135265, patch by Morten Welinder.

	* configure.in: Use AC_SYS_LARGEFILE.

	* */*.c: #include <config.h>
2004-03-06 03:38:59 +00:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. 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 <math.h>
#include <string.h>
#include "gtklabel.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkwindow.h"
#include "gdk/gdkkeysyms.h"
#include "gtkclipboard.h"
#include <pango/pango.h>
#include "gtkimagemenuitem.h"
#include "gtkintl.h"
#include "gtkseparatormenuitem.h"
#include "gtkmenuitem.h"
#include "gtknotebook.h"
#include "gtkstock.h"
#include "gtkbindings.h"
struct _GtkLabelSelectionInfo
{
GdkWindow *window;
gint selection_anchor;
gint selection_end;
GtkWidget *popup_menu;
};
enum {
MOVE_CURSOR,
COPY_CLIPBOARD,
POPULATE_POPUP,
LAST_SIGNAL
};
enum {
PROP_0,
PROP_LABEL,
PROP_ATTRIBUTES,
PROP_USE_MARKUP,
PROP_USE_UNDERLINE,
PROP_JUSTIFY,
PROP_PATTERN,
PROP_WRAP,
PROP_SELECTABLE,
PROP_MNEMONIC_KEYVAL,
PROP_MNEMONIC_WIDGET,
PROP_CURSOR_POSITION,
PROP_SELECTION_BOUND
};
static guint signals[LAST_SIGNAL] = { 0 };
static void gtk_label_class_init (GtkLabelClass *klass);
static void gtk_label_init (GtkLabel *label);
static void gtk_label_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_label_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_label_destroy (GtkObject *object);
static void gtk_label_finalize (GObject *object);
static void gtk_label_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gtk_label_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gtk_label_state_changed (GtkWidget *widget,
GtkStateType state);
static void gtk_label_style_set (GtkWidget *widget,
GtkStyle *previous_style);
static void gtk_label_direction_changed (GtkWidget *widget,
GtkTextDirection previous_dir);
static gint gtk_label_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_label_realize (GtkWidget *widget);
static void gtk_label_unrealize (GtkWidget *widget);
static void gtk_label_map (GtkWidget *widget);
static void gtk_label_unmap (GtkWidget *widget);
static gboolean gtk_label_button_press (GtkWidget *widget,
GdkEventButton *event);
static gboolean gtk_label_button_release (GtkWidget *widget,
GdkEventButton *event);
static gboolean gtk_label_motion (GtkWidget *widget,
GdkEventMotion *event);
static void gtk_label_set_text_internal (GtkLabel *label,
gchar *str);
static void gtk_label_set_label_internal (GtkLabel *label,
gchar *str);
static void gtk_label_set_use_markup_internal (GtkLabel *label,
gboolean val);
static void gtk_label_set_use_underline_internal (GtkLabel *label,
gboolean val);
static void gtk_label_set_attributes_internal (GtkLabel *label,
PangoAttrList *attrs);
static void gtk_label_set_uline_text_internal (GtkLabel *label,
const gchar *str);
static void gtk_label_set_pattern_internal (GtkLabel *label,
const gchar *pattern);
static void set_markup (GtkLabel *label,
const gchar *str,
gboolean with_uline);
static void gtk_label_recalculate (GtkLabel *label);
static void gtk_label_hierarchy_changed (GtkWidget *widget,
GtkWidget *old_toplevel);
static void gtk_label_screen_changed (GtkWidget *widget,
GdkScreen *old_screen);
static void gtk_label_create_window (GtkLabel *label);
static void gtk_label_destroy_window (GtkLabel *label);
static void gtk_label_clear_layout (GtkLabel *label);
static void gtk_label_ensure_layout (GtkLabel *label);
static void gtk_label_select_region_index (GtkLabel *label,
gint anchor_index,
gint end_index);
static gboolean gtk_label_mnemonic_activate (GtkWidget *widget,
gboolean group_cycling);
static void gtk_label_setup_mnemonic (GtkLabel *label,
guint last_key);
/* For selectable lables: */
static void gtk_label_move_cursor (GtkLabel *label,
GtkMovementStep step,
gint count,
gboolean extend_selection);
static void gtk_label_copy_clipboard (GtkLabel *label);
static void gtk_label_select_all (GtkLabel *label);
static void gtk_label_do_popup (GtkLabel *label,
GdkEventButton *event);
static gint gtk_label_move_forward_word (GtkLabel *label,
gint start);
static gint gtk_label_move_backward_word (GtkLabel *label,
gint start);
static GtkMiscClass *parent_class = NULL;
GType
gtk_label_get_type (void)
{
static GType label_type = 0;
if (!label_type)
{
static const GTypeInfo label_info =
{
sizeof (GtkLabelClass),
NULL, /* base_init */
NULL, /* base_finalize */
(GClassInitFunc) gtk_label_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GtkLabel),
32, /* n_preallocs */
(GInstanceInitFunc) gtk_label_init,
};
label_type = g_type_register_static (GTK_TYPE_MISC, "GtkLabel",
&label_info, 0);
}
return label_type;
}
static void
add_move_binding (GtkBindingSet *binding_set,
guint keyval,
guint modmask,
GtkMovementStep step,
gint count)
{
g_return_if_fail ((modmask & GDK_SHIFT_MASK) == 0);
gtk_binding_entry_add_signal (binding_set, keyval, modmask,
"move_cursor", 3,
G_TYPE_ENUM, step,
G_TYPE_INT, count,
G_TYPE_BOOLEAN, FALSE);
/* Selection-extending version */
gtk_binding_entry_add_signal (binding_set, keyval, modmask | GDK_SHIFT_MASK,
"move_cursor", 3,
G_TYPE_ENUM, step,
G_TYPE_INT, count,
G_TYPE_BOOLEAN, TRUE);
}
static void
gtk_label_class_init (GtkLabelClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkObjectClass *object_class = GTK_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
GtkBindingSet *binding_set;
parent_class = g_type_class_peek_parent (class);
gobject_class->set_property = gtk_label_set_property;
gobject_class->get_property = gtk_label_get_property;
gobject_class->finalize = gtk_label_finalize;
object_class->destroy = gtk_label_destroy;
widget_class->size_request = gtk_label_size_request;
widget_class->size_allocate = gtk_label_size_allocate;
widget_class->state_changed = gtk_label_state_changed;
widget_class->style_set = gtk_label_style_set;
widget_class->direction_changed = gtk_label_direction_changed;
widget_class->expose_event = gtk_label_expose;
widget_class->realize = gtk_label_realize;
widget_class->unrealize = gtk_label_unrealize;
widget_class->map = gtk_label_map;
widget_class->unmap = gtk_label_unmap;
widget_class->button_press_event = gtk_label_button_press;
widget_class->button_release_event = gtk_label_button_release;
widget_class->motion_notify_event = gtk_label_motion;
widget_class->hierarchy_changed = gtk_label_hierarchy_changed;
widget_class->screen_changed = gtk_label_screen_changed;
widget_class->mnemonic_activate = gtk_label_mnemonic_activate;
class->move_cursor = gtk_label_move_cursor;
class->copy_clipboard = gtk_label_copy_clipboard;
signals[MOVE_CURSOR] =
g_signal_new ("move_cursor",
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkLabelClass, move_cursor),
NULL, NULL,
_gtk_marshal_VOID__ENUM_INT_BOOLEAN,
G_TYPE_NONE, 3,
GTK_TYPE_MOVEMENT_STEP,
G_TYPE_INT,
G_TYPE_BOOLEAN);
signals[COPY_CLIPBOARD] =
g_signal_new ("copy_clipboard",
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkLabelClass, copy_clipboard),
NULL, NULL,
_gtk_marshal_VOID__VOID,
G_TYPE_NONE, 0);
signals[POPULATE_POPUP] =
g_signal_new ("populate_popup",
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkLabelClass, populate_popup),
NULL, NULL,
_gtk_marshal_VOID__OBJECT,
G_TYPE_NONE, 1,
GTK_TYPE_MENU);
g_object_class_install_property (gobject_class,
PROP_LABEL,
g_param_spec_string ("label",
P_("Label"),
P_("The text of the label"),
NULL,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_ATTRIBUTES,
g_param_spec_boxed ("attributes",
P_("Attributes"),
P_("A list of style attributes to apply to the text of the label"),
PANGO_TYPE_ATTR_LIST,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_USE_MARKUP,
g_param_spec_boolean ("use_markup",
P_("Use markup"),
P_("The text of the label includes XML markup. See pango_parse_markup()"),
FALSE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_USE_UNDERLINE,
g_param_spec_boolean ("use_underline",
P_("Use underline"),
P_("If set, an underline in the text indicates the next character should be used for the mnemonic accelerator key"),
FALSE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_JUSTIFY,
g_param_spec_enum ("justify",
P_("Justification"),
P_("The alignment of the lines in the text of the label relative to each other. This does NOT affect the alignment of the label within its allocation. See GtkMisc::xalign for that"),
GTK_TYPE_JUSTIFICATION,
GTK_JUSTIFY_LEFT,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_PATTERN,
g_param_spec_string ("pattern",
P_("Pattern"),
P_("A string with _ characters in positions correspond to characters in the text to underline"),
NULL,
G_PARAM_WRITABLE));
g_object_class_install_property (gobject_class,
PROP_WRAP,
g_param_spec_boolean ("wrap",
P_("Line wrap"),
P_("If set, wrap lines if the text becomes too wide"),
FALSE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_SELECTABLE,
g_param_spec_boolean ("selectable",
P_("Selectable"),
P_("Whether the label text can be selected with the mouse"),
FALSE,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_MNEMONIC_KEYVAL,
g_param_spec_uint ("mnemonic_keyval",
P_("Mnemonic key"),
P_("The mnemonic accelerator key for this label"),
0,
G_MAXUINT,
GDK_VoidSymbol,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_MNEMONIC_WIDGET,
g_param_spec_object ("mnemonic_widget",
P_("Mnemonic widget"),
P_("The widget to be activated when the label's mnemonic "
"key is pressed"),
GTK_TYPE_WIDGET,
G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_CURSOR_POSITION,
g_param_spec_int ("cursor_position",
P_("Cursor Position"),
P_("The current position of the insertion cursor in chars"),
0,
G_MAXINT,
0,
G_PARAM_READABLE));
g_object_class_install_property (gobject_class,
PROP_SELECTION_BOUND,
g_param_spec_int ("selection_bound",
P_("Selection Bound"),
P_("The position of the opposite end of the selection from the cursor in chars"),
0,
G_MAXINT,
0,
G_PARAM_READABLE));
/*
* Key bindings
*/
binding_set = gtk_binding_set_by_class (class);
/* Moving the insertion point */
add_move_binding (binding_set, GDK_Right, 0,
GTK_MOVEMENT_VISUAL_POSITIONS, 1);
add_move_binding (binding_set, GDK_Left, 0,
GTK_MOVEMENT_VISUAL_POSITIONS, -1);
add_move_binding (binding_set, GDK_KP_Right, 0,
GTK_MOVEMENT_VISUAL_POSITIONS, 1);
add_move_binding (binding_set, GDK_KP_Left, 0,
GTK_MOVEMENT_VISUAL_POSITIONS, -1);
add_move_binding (binding_set, GDK_f, GDK_CONTROL_MASK,
GTK_MOVEMENT_LOGICAL_POSITIONS, 1);
add_move_binding (binding_set, GDK_b, GDK_CONTROL_MASK,
GTK_MOVEMENT_LOGICAL_POSITIONS, -1);
add_move_binding (binding_set, GDK_Right, GDK_CONTROL_MASK,
GTK_MOVEMENT_WORDS, 1);
add_move_binding (binding_set, GDK_Left, GDK_CONTROL_MASK,
GTK_MOVEMENT_WORDS, -1);
add_move_binding (binding_set, GDK_KP_Right, GDK_CONTROL_MASK,
GTK_MOVEMENT_WORDS, 1);
add_move_binding (binding_set, GDK_KP_Left, GDK_CONTROL_MASK,
GTK_MOVEMENT_WORDS, -1);
add_move_binding (binding_set, GDK_a, GDK_CONTROL_MASK,
GTK_MOVEMENT_PARAGRAPH_ENDS, -1);
add_move_binding (binding_set, GDK_e, GDK_CONTROL_MASK,
GTK_MOVEMENT_PARAGRAPH_ENDS, 1);
add_move_binding (binding_set, GDK_f, GDK_MOD1_MASK,
GTK_MOVEMENT_WORDS, 1);
add_move_binding (binding_set, GDK_b, GDK_MOD1_MASK,
GTK_MOVEMENT_WORDS, -1);
add_move_binding (binding_set, GDK_Home, 0,
GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
add_move_binding (binding_set, GDK_End, 0,
GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
add_move_binding (binding_set, GDK_KP_Home, 0,
GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
add_move_binding (binding_set, GDK_KP_End, 0,
GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
add_move_binding (binding_set, GDK_Home, GDK_CONTROL_MASK,
GTK_MOVEMENT_BUFFER_ENDS, -1);
add_move_binding (binding_set, GDK_End, GDK_CONTROL_MASK,
GTK_MOVEMENT_BUFFER_ENDS, 1);
add_move_binding (binding_set, GDK_KP_Home, GDK_CONTROL_MASK,
GTK_MOVEMENT_BUFFER_ENDS, -1);
add_move_binding (binding_set, GDK_KP_End, GDK_CONTROL_MASK,
GTK_MOVEMENT_BUFFER_ENDS, 1);
/* copy */
gtk_binding_entry_add_signal (binding_set, GDK_c, GDK_CONTROL_MASK,
"copy_clipboard", 0);
}
static void
gtk_label_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkLabel *label;
label = GTK_LABEL (object);
switch (prop_id)
{
case PROP_LABEL:
gtk_label_set_label (label, g_value_get_string (value));
break;
case PROP_ATTRIBUTES:
gtk_label_set_attributes (label, g_value_get_boxed (value));
break;
case PROP_USE_MARKUP:
gtk_label_set_use_markup (label, g_value_get_boolean (value));
break;
case PROP_USE_UNDERLINE:
gtk_label_set_use_underline (label, g_value_get_boolean (value));
break;
case PROP_JUSTIFY:
gtk_label_set_justify (label, g_value_get_enum (value));
break;
case PROP_PATTERN:
gtk_label_set_pattern (label, g_value_get_string (value));
break;
case PROP_WRAP:
gtk_label_set_line_wrap (label, g_value_get_boolean (value));
break;
case PROP_SELECTABLE:
gtk_label_set_selectable (label, g_value_get_boolean (value));
break;
case PROP_MNEMONIC_WIDGET:
gtk_label_set_mnemonic_widget (label, (GtkWidget*) g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_label_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkLabel *label;
label = GTK_LABEL (object);
switch (prop_id)
{
case PROP_LABEL:
g_value_set_string (value, label->label);
break;
case PROP_ATTRIBUTES:
g_value_set_boxed (value, label->attrs);
break;
case PROP_USE_MARKUP:
g_value_set_boolean (value, label->use_markup);
break;
case PROP_USE_UNDERLINE:
g_value_set_boolean (value, label->use_underline);
break;
case PROP_JUSTIFY:
g_value_set_enum (value, label->jtype);
break;
case PROP_WRAP:
g_value_set_boolean (value, label->wrap);
break;
case PROP_SELECTABLE:
g_value_set_boolean (value, gtk_label_get_selectable (label));
break;
case PROP_MNEMONIC_KEYVAL:
g_value_set_uint (value, label->mnemonic_keyval);
break;
case PROP_MNEMONIC_WIDGET:
g_value_set_object (value, (GObject*) label->mnemonic_widget);
break;
case PROP_CURSOR_POSITION:
if (label->select_info)
{
gint offset = g_utf8_pointer_to_offset (label->text,
label->text + label->select_info->selection_end);
g_value_set_int (value, offset);
}
else
g_value_set_int (value, 0);
break;
case PROP_SELECTION_BOUND:
if (label->select_info)
{
gint offset = g_utf8_pointer_to_offset (label->text,
label->text + label->select_info->selection_anchor);
g_value_set_int (value, offset);
}
else
g_value_set_int (value, 0);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_label_init (GtkLabel *label)
{
GTK_WIDGET_SET_FLAGS (label, GTK_NO_WINDOW);
label->label = NULL;
label->jtype = GTK_JUSTIFY_LEFT;
label->wrap = FALSE;
label->use_underline = FALSE;
label->use_markup = FALSE;
label->mnemonic_keyval = GDK_VoidSymbol;
label->layout = NULL;
label->text = NULL;
label->attrs = NULL;
label->mnemonic_widget = NULL;
label->mnemonic_window = NULL;
gtk_label_set_text (label, "");
}
/**
* gtk_label_new:
* @str: The text of the label
*
* Creates a new label with the given text inside it. You can
* pass %NULL to get an empty label widget.
*
* Return value: the new #GtkLabel
**/
GtkWidget*
gtk_label_new (const gchar *str)
{
GtkLabel *label;
label = g_object_new (GTK_TYPE_LABEL, NULL);
if (str && *str)
gtk_label_set_text (label, str);
return GTK_WIDGET (label);
}
/**
* gtk_label_new_with_mnemonic:
* @str: The text of the label, with an underscore in front of the
* mnemonic character
*
* Creates a new #GtkLabel, containing the text in @str.
*
* If characters in @str are preceded by an underscore, they are
* underlined. If you need a literal underscore character in a label, use
* '__' (two underscores). The first underlined character represents a
* keyboard accelerator called a mnemonic. The mnemonic key can be used
* to activate another widget, chosen automatically, or explicitly using
* gtk_label_set_mnemonic_widget().
*
* If gtk_label_set_mnemonic_widget()
* is not called, then the first activatable ancestor of the #GtkLabel
* will be chosen as the mnemonic widget. For instance, if the
* label is inside a button or menu item, the button or menu item will
* automatically become the mnemonic widget and be activated by
* the mnemonic.
*
* Return value: the new #GtkLabel
**/
GtkWidget*
gtk_label_new_with_mnemonic (const gchar *str)
{
GtkLabel *label;
label = g_object_new (GTK_TYPE_LABEL, NULL);
if (str && *str)
gtk_label_set_text_with_mnemonic (label, str);
return GTK_WIDGET (label);
}
static gboolean
gtk_label_mnemonic_activate (GtkWidget *widget,
gboolean group_cycling)
{
GtkWidget *parent;
if (GTK_LABEL (widget)->mnemonic_widget)
return gtk_widget_mnemonic_activate (GTK_LABEL (widget)->mnemonic_widget, group_cycling);
/* Try to find the widget to activate by traversing the
* widget's ancestry.
*/
parent = widget->parent;
if (parent && GTK_IS_NOTEBOOK (parent))
return FALSE;
while (parent)
{
if (GTK_WIDGET_CAN_FOCUS (parent) ||
(!group_cycling && GTK_WIDGET_GET_CLASS (parent)->activate_signal) ||
(parent->parent && GTK_IS_NOTEBOOK (parent->parent)) ||
(GTK_IS_MENU_ITEM (parent)))
return gtk_widget_mnemonic_activate (parent, group_cycling);
parent = parent->parent;
}
/* barf if there was nothing to activate */
g_warning ("Couldn't find a target for a mnemonic activation.");
gdk_display_beep (gtk_widget_get_display (widget));
return FALSE;
}
static void
gtk_label_setup_mnemonic (GtkLabel *label,
guint last_key)
{
GtkWidget *toplevel;
if (last_key != GDK_VoidSymbol && label->mnemonic_window)
{
gtk_window_remove_mnemonic (label->mnemonic_window,
last_key,
GTK_WIDGET (label));
label->mnemonic_window = NULL;
}
if (label->mnemonic_keyval == GDK_VoidSymbol)
return;
toplevel = gtk_widget_get_toplevel (GTK_WIDGET (label));
if (GTK_WIDGET_TOPLEVEL (toplevel))
{
gtk_window_add_mnemonic (GTK_WINDOW (toplevel),
label->mnemonic_keyval,
GTK_WIDGET (label));
label->mnemonic_window = GTK_WINDOW (toplevel);
}
}
static void
gtk_label_hierarchy_changed (GtkWidget *widget,
GtkWidget *old_toplevel)
{
GtkLabel *label = GTK_LABEL (widget);
gtk_label_setup_mnemonic (label, label->mnemonic_keyval);
}
static void
gtk_label_screen_changed (GtkWidget *widget,
GdkScreen *old_screen)
{
gtk_label_clear_layout (GTK_LABEL (widget));
}
static void
label_mnemonic_widget_weak_notify (gpointer data,
GObject *where_the_object_was)
{
GtkLabel *label = data;
label->mnemonic_widget = NULL;
g_object_notify (G_OBJECT (label), "mnemonic_widget");
}
/**
* gtk_label_set_mnemonic_widget:
* @label: a #GtkLabel
* @widget: the target #GtkWidget
*
* If the label has been set so that it has an mnemonic key (using
* i.e. gtk_label_set_markup_with_mnemonic(),
* gtk_label_set_text_with_mnemonic(), gtk_label_new_with_mnemonic()
* or the "use_underline" property) the label can be associated with a
* widget that is the target of the mnemonic. When the label is inside
* a widget (like a #GtkButton or a #GtkNotebook tab) it is
* automatically associated with the correct widget, but sometimes
* (i.e. when the target is a #GtkEntry next to the label) you need to
* set it explicitly using this function.
*
* The target widget will be accelerated by emitting "mnemonic_activate" on it.
* The default handler for this signal will activate the widget if there are no
* mnemonic collisions and toggle focus between the colliding widgets otherwise.
**/
void
gtk_label_set_mnemonic_widget (GtkLabel *label,
GtkWidget *widget)
{
g_return_if_fail (GTK_IS_LABEL (label));
if (widget)
g_return_if_fail (GTK_IS_WIDGET (widget));
if (label->mnemonic_widget)
{
gtk_widget_remove_mnemonic_label (label->mnemonic_widget, GTK_WIDGET (label));
g_object_weak_unref (G_OBJECT (label->mnemonic_widget),
label_mnemonic_widget_weak_notify,
label);
}
label->mnemonic_widget = widget;
if (label->mnemonic_widget)
{
g_object_weak_ref (G_OBJECT (label->mnemonic_widget),
label_mnemonic_widget_weak_notify,
label);
gtk_widget_add_mnemonic_label (label->mnemonic_widget, GTK_WIDGET (label));
}
g_object_notify (G_OBJECT (label), "mnemonic_widget");
}
/**
* gtk_label_get_mnemonic_widget:
* @label: a #GtkLabel
*
* Retrieves the target of the mnemonic (keyboard shortcut) of this
* label. See gtk_label_set_mnemonic_widget ().
*
* Return value: the target of the label's mnemonic, or %NULL if none
* has been set and the default algorithm will be used.
**/
GtkWidget *
gtk_label_get_mnemonic_widget (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), NULL);
return label->mnemonic_widget;
}
/**
* gtk_label_get_mnemonic_keyval:
* @label: a #GtkLabel
*
* If the label has been set so that it has an mnemonic key this function
* returns the keyval used for the mnemonic accelerator. If there is no
* mnemonic set up it returns #GDK_VoidSymbol.
*
* Returns: GDK keyval usable for accelerators, or #GDK_VoidSymbol
**/
guint
gtk_label_get_mnemonic_keyval (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), GDK_VoidSymbol);
return label->mnemonic_keyval;
}
static void
gtk_label_set_text_internal (GtkLabel *label,
gchar *str)
{
g_free (label->text);
label->text = str;
gtk_label_select_region_index (label, 0, 0);
}
static void
gtk_label_set_label_internal (GtkLabel *label,
gchar *str)
{
g_free (label->label);
label->label = str;
g_object_notify (G_OBJECT (label), "label");
}
static void
gtk_label_set_use_markup_internal (GtkLabel *label,
gboolean val)
{
val = val != FALSE;
if (label->use_markup != val)
{
g_object_notify (G_OBJECT (label), "use_markup");
label->use_markup = val;
}
}
static void
gtk_label_set_use_underline_internal (GtkLabel *label,
gboolean val)
{
val = val != FALSE;
if (label->use_underline != val)
{
g_object_notify (G_OBJECT (label), "use_underline");
label->use_underline = val;
}
}
static void
gtk_label_set_attributes_internal (GtkLabel *label,
PangoAttrList *attrs)
{
if (attrs)
pango_attr_list_ref (attrs);
if (label->attrs)
pango_attr_list_unref (label->attrs);
if (!label->use_markup && !label->use_underline)
{
if (attrs)
pango_attr_list_ref (attrs);
if (label->effective_attrs)
pango_attr_list_unref (label->effective_attrs);
label->effective_attrs = attrs;
}
label->attrs = attrs;
g_object_notify (G_OBJECT (label), "attributes");
}
/* Calculates text, attrs and mnemonic_keyval from
* label, use_underline and use_markup
*/
static void
gtk_label_recalculate (GtkLabel *label)
{
if (label->use_markup)
set_markup (label, label->label, label->use_underline);
else
{
if (label->use_underline)
gtk_label_set_uline_text_internal (label, label->label);
else
{
gtk_label_set_text_internal (label, g_strdup (label->label));
if (label->attrs)
pango_attr_list_ref (label->attrs);
if (label->effective_attrs)
pango_attr_list_unref (label->effective_attrs);
label->effective_attrs = label->attrs;
}
}
if (!label->use_underline)
{
guint keyval = label->mnemonic_keyval;
label->mnemonic_keyval = GDK_VoidSymbol;
gtk_label_setup_mnemonic (label, keyval);
}
gtk_label_clear_layout (label);
gtk_widget_queue_resize (GTK_WIDGET (label));
}
/**
* gtk_label_set_text:
* @label: a #GtkLabel
* @str: The text you want to set.
*
* Sets the text within the #GtkLabel widget. It overwrites any text that
* was there before.
*
* This will also clear any previously set mnemonic accelerators.
**/
void
gtk_label_set_text (GtkLabel *label,
const gchar *str)
{
g_return_if_fail (GTK_IS_LABEL (label));
g_object_freeze_notify (G_OBJECT (label));
gtk_label_set_label_internal (label, g_strdup (str ? str : ""));
gtk_label_set_use_markup_internal (label, FALSE);
gtk_label_set_use_underline_internal (label, FALSE);
gtk_label_recalculate (label);
g_object_thaw_notify (G_OBJECT (label));
}
/**
* gtk_label_set_attributes:
* @label: a #GtkLabel
* @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_underline" property or the "use_markup" property
* is %TRUE.
**/
void
gtk_label_set_attributes (GtkLabel *label,
PangoAttrList *attrs)
{
g_return_if_fail (GTK_IS_LABEL (label));
gtk_label_set_attributes_internal (label, attrs);
gtk_label_clear_layout (label);
gtk_widget_queue_resize (GTK_WIDGET (label));
}
/**
* gtk_label_get_attributes:
* @label: a #GtkLabel
*
* Gets the attribute list that was set on the label using
* gtk_label_set_attributes(), if any. This function does
* not reflect attributes that come from the labels markup
* (see gtk_label_set_markup()). If you want to get the
* effective attributes for the label, use
* pango_layout_get_attribute (gtk_label_get_layout (label)).
*
* Return value: the attribute list, or %NULL if none was set.
**/
PangoAttrList *
gtk_label_get_attributes (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), NULL);
return label->attrs;
}
/**
* gtk_label_set_label:
* @label: a #GtkLabel
* @str: the new text to set for the label
*
* Sets the text of the label. The label is interpreted as
* including embedded underlines and/or Pango markup depending
* on the values of label->use_underline and label->use_markup.
**/
void
gtk_label_set_label (GtkLabel *label,
const gchar *str)
{
guint last_keyval;
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (str != NULL);
last_keyval = label->mnemonic_keyval;
gtk_label_set_label_internal (label, g_strdup (str));
gtk_label_recalculate (label);
if (last_keyval != label->mnemonic_keyval)
gtk_label_setup_mnemonic (label, last_keyval);
}
/**
* gtk_label_get_label:
* @label: a #GtkLabel
*
* Fetches the text from a label widget including any embedded
* underlines indicating mnemonics and Pango markup. (See
* gtk_label_get_text ()).
*
* Return value: the text of the label widget. This string is
* owned by the widget and must not be modified or freed.
**/
G_CONST_RETURN gchar *
gtk_label_get_label (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), NULL);
return label->label;
}
static void
set_markup (GtkLabel *label,
const gchar *str,
gboolean with_uline)
{
gchar *text = NULL;
GError *error = NULL;
PangoAttrList *attrs = NULL;
gunichar accel_char = 0;
if (!pango_parse_markup (str,
-1,
with_uline ? '_' : 0,
&attrs,
&text,
with_uline ? &accel_char : NULL,
&error))
{
g_warning ("Failed to set label from markup due to error parsing markup: %s",
error->message);
g_error_free (error);
return;
}
if (text)
gtk_label_set_text_internal (label, text);
if (attrs)
{
if (label->effective_attrs)
pango_attr_list_unref (label->effective_attrs);
label->effective_attrs = attrs;
}
if (accel_char != 0)
label->mnemonic_keyval = gdk_keyval_to_lower (gdk_unicode_to_keyval (accel_char));
else
label->mnemonic_keyval = GDK_VoidSymbol;
}
/**
* gtk_label_set_markup:
* @label: a #GtkLabel
* @str: a markup string (see <link linkend="PangoMarkupFormat">Pango markup format</link>)
*
* Parses @str which is marked up with the <link linkend="PangoMarkupFormat">Pango text markup language</link>,
* setting the label's text and attribute list based on the parse results.
**/
void
gtk_label_set_markup (GtkLabel *label,
const gchar *str)
{
g_return_if_fail (GTK_IS_LABEL (label));
gtk_label_set_label_internal (label, g_strdup (str ? str : ""));
gtk_label_set_use_markup_internal (label, TRUE);
gtk_label_set_use_underline_internal (label, FALSE);
gtk_label_recalculate (label);
}
/**
* gtk_label_set_markup_with_mnemonic:
* @label: a #GtkLabel
* @str: a markup string (see <link linkend="PangoMarkupFormat">Pango markup format</link>)
*
* Parses @str which is marked up with the <link linkend="PangoMarkupFormat">Pango text markup language</link>,
* setting the label's text and attribute list based on the parse results.
* If characters in @str are preceded by an underscore, they are underlined
* indicating that they represent a keyboard accelerator called a mnemonic.
*
* The mnemonic key can be used to activate another widget, chosen automatically,
* or explicitly using gtk_label_set_mnemonic_widget().
**/
void
gtk_label_set_markup_with_mnemonic (GtkLabel *label,
const gchar *str)
{
guint last_keyval;
g_return_if_fail (GTK_IS_LABEL (label));
last_keyval = label->mnemonic_keyval;
gtk_label_set_label_internal (label, g_strdup (str ? str : ""));
gtk_label_set_use_markup_internal (label, TRUE);
gtk_label_set_use_underline_internal (label, TRUE);
gtk_label_recalculate (label);
gtk_label_setup_mnemonic (label, last_keyval);
}
/**
* gtk_label_get_text:
* @label: a #GtkLabel
*
* Fetches the text from a label widget, as displayed on the
* screen. This does not include any embedded underlines
* indicating mnemonics or Pango markup. (See gtk_label_get_label())
*
* Return value: the text in the label widget. This is the internal
* string used by the label, and must not be modified.
**/
G_CONST_RETURN gchar *
gtk_label_get_text (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), NULL);
return label->text;
}
static PangoAttrList *
gtk_label_pattern_to_attrs (GtkLabel *label,
const gchar *pattern)
{
const char *start;
const char *p = label->text;
const char *q = pattern;
PangoAttrList *attrs;
attrs = pango_attr_list_new ();
while (1)
{
while (*p && *q && *q != '_')
{
p = g_utf8_next_char (p);
q++;
}
start = p;
while (*p && *q && *q == '_')
{
p = g_utf8_next_char (p);
q++;
}
if (p > start)
{
PangoAttribute *attr = pango_attr_underline_new (PANGO_UNDERLINE_LOW);
attr->start_index = start - label->text;
attr->end_index = p - label->text;
pango_attr_list_insert (attrs, attr);
}
else
break;
}
return attrs;
}
static void
gtk_label_set_pattern_internal (GtkLabel *label,
const gchar *pattern)
{
PangoAttrList *attrs;
g_return_if_fail (GTK_IS_LABEL (label));
attrs = gtk_label_pattern_to_attrs (label, pattern);
if (label->effective_attrs)
pango_attr_list_unref (label->effective_attrs);
label->effective_attrs = attrs;
}
void
gtk_label_set_pattern (GtkLabel *label,
const gchar *pattern)
{
g_return_if_fail (GTK_IS_LABEL (label));
gtk_label_set_pattern_internal (label, pattern);
gtk_label_clear_layout (label);
gtk_widget_queue_resize (GTK_WIDGET (label));
}
/**
* gtk_label_set_justify:
* @label: a #GtkLabel
* @jtype: a #GtkJustification
*
* Sets the alignment of the lines in the text of the label relative to
* each other. %GTK_JUSTIFY_LEFT is the default value when the
* widget is first created with gtk_label_new(). If you instead want
* to set the alignment of the label as a whole, use
* gtk_misc_set_alignment() instead. gtk_label_set_justify() has no
* effect on labels containing only a single line.
**/
void
gtk_label_set_justify (GtkLabel *label,
GtkJustification jtype)
{
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (jtype >= GTK_JUSTIFY_LEFT && jtype <= GTK_JUSTIFY_FILL);
if ((GtkJustification) label->jtype != jtype)
{
label->jtype = jtype;
/* No real need to be this drastic, but easier than duplicating the code */
gtk_label_clear_layout (label);
g_object_notify (G_OBJECT (label), "justify");
gtk_widget_queue_resize (GTK_WIDGET (label));
}
}
/**
* gtk_label_get_justify:
* @label: a #GtkLabel
*
* Returns the justification of the label. See gtk_label_set_justify ().
*
* Return value: #GtkJustification
**/
GtkJustification
gtk_label_get_justify (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), 0);
return label->jtype;
}
/**
* gtk_label_set_line_wrap:
* @label: a #GtkLabel
* @wrap: the setting
*
* Toggles line wrapping within the #GtkLabel 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.
**/
void
gtk_label_set_line_wrap (GtkLabel *label,
gboolean wrap)
{
g_return_if_fail (GTK_IS_LABEL (label));
wrap = wrap != FALSE;
if (label->wrap != wrap)
{
label->wrap = wrap;
g_object_notify (G_OBJECT (label), "wrap");
gtk_widget_queue_resize (GTK_WIDGET (label));
}
}
/**
* gtk_label_get_line_wrap:
* @label: a #GtkLabel
*
* Returns whether lines in the label are automatically wrapped. See gtk_label_set_line_wrap ().
*
* Return value: %TRUE if the lines of the label are automatically wrapped.
*/
gboolean
gtk_label_get_line_wrap (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), FALSE);
return label->wrap;
}
void
gtk_label_get (GtkLabel *label,
gchar **str)
{
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (str != NULL);
*str = label->text;
}
static void
gtk_label_destroy (GtkObject *object)
{
GtkLabel *label = GTK_LABEL (object);
gtk_label_set_mnemonic_widget (label, NULL);
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gtk_label_finalize (GObject *object)
{
GtkLabel *label;
g_return_if_fail (GTK_IS_LABEL (object));
label = GTK_LABEL (object);
g_free (label->label);
g_free (label->text);
if (label->layout)
g_object_unref (label->layout);
if (label->attrs)
pango_attr_list_unref (label->attrs);
if (label->effective_attrs)
pango_attr_list_unref (label->effective_attrs);
g_free (label->select_info);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gtk_label_clear_layout (GtkLabel *label)
{
if (label->layout)
{
g_object_unref (label->layout);
label->layout = NULL;
}
}
typedef struct _LabelWrapWidth LabelWrapWidth;
struct _LabelWrapWidth
{
gint width;
PangoFontDescription *font_desc;
};
static void
label_wrap_width_free (gpointer data)
{
LabelWrapWidth *wrap_width = data;
pango_font_description_free (wrap_width->font_desc);
g_free (wrap_width);
}
static gint
get_label_wrap_width (GtkLabel *label)
{
PangoLayout *layout;
GtkStyle *style = GTK_WIDGET (label)->style;
LabelWrapWidth *wrap_width = g_object_get_data (G_OBJECT (style), "gtk-label-wrap-width");
if (!wrap_width)
{
wrap_width = g_new0 (LabelWrapWidth, 1);
g_object_set_data_full (G_OBJECT (style), "gtk-label-wrap-width",
wrap_width, label_wrap_width_free);
}
if (wrap_width->font_desc && pango_font_description_equal (wrap_width->font_desc, style->font_desc))
return wrap_width->width;
if (wrap_width->font_desc)
pango_font_description_free (wrap_width->font_desc);
wrap_width->font_desc = pango_font_description_copy (style->font_desc);
layout = gtk_widget_create_pango_layout (GTK_WIDGET (label),
"This long string gives a good enough length for any line to have.");
pango_layout_get_size (layout, &wrap_width->width, NULL);
g_object_unref (layout);
return wrap_width->width;
}
static void
gtk_label_ensure_layout (GtkLabel *label)
{
GtkWidget *widget;
PangoRectangle logical_rect;
gint rwidth, rheight;
gboolean rtl;
widget = GTK_WIDGET (label);
rtl = gtk_widget_get_direction(widget) == GTK_TEXT_DIR_RTL;
rwidth = label->misc.xpad * 2;
rheight = label->misc.ypad * 2;
if (!label->layout)
{
PangoAlignment align = PANGO_ALIGN_LEFT; /* Quiet gcc */
label->layout = gtk_widget_create_pango_layout (widget, label->text);
if (label->effective_attrs)
pango_layout_set_attributes (label->layout, label->effective_attrs);
switch (label->jtype)
{
case GTK_JUSTIFY_LEFT:
align = rtl ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
break;
case GTK_JUSTIFY_RIGHT:
align = rtl ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT;
break;
case GTK_JUSTIFY_CENTER:
align = PANGO_ALIGN_CENTER;
break;
case GTK_JUSTIFY_FILL:
/* FIXME: This just doesn't work to do this */
align = rtl ? PANGO_ALIGN_RIGHT : PANGO_ALIGN_LEFT;
pango_layout_set_justify (label->layout, TRUE);
break;
default:
g_assert_not_reached();
}
pango_layout_set_alignment (label->layout, align);
if (label->wrap)
{
GtkWidgetAuxInfo *aux_info;
gint longest_paragraph;
gint width, height;
aux_info = _gtk_widget_get_aux_info (widget, FALSE);
if (aux_info && aux_info->width > 0)
pango_layout_set_width (label->layout, aux_info->width * PANGO_SCALE);
else
{
GdkScreen *screen = gtk_widget_get_screen (GTK_WIDGET (label));
gint wrap_width;
pango_layout_set_width (label->layout, -1);
pango_layout_get_extents (label->layout, NULL, &logical_rect);
width = logical_rect.width;
/* Try to guess a reasonable maximum width */
longest_paragraph = width;
wrap_width = get_label_wrap_width (label);
width = MIN (width, wrap_width);
width = MIN (width,
PANGO_SCALE * (gdk_screen_get_width (screen) + 1) / 2);
pango_layout_set_width (label->layout, width);
pango_layout_get_extents (label->layout, NULL, &logical_rect);
width = logical_rect.width;
height = logical_rect.height;
/* Unfortunately, the above may leave us with a very unbalanced looking paragraph,
* so we try short search for a narrower width that leaves us with the same height
*/
if (longest_paragraph > 0)
{
gint nlines, perfect_width;
nlines = pango_layout_get_line_count (label->layout);
perfect_width = (longest_paragraph + nlines - 1) / nlines;
if (perfect_width < width)
{
pango_layout_set_width (label->layout, perfect_width);
pango_layout_get_extents (label->layout, NULL, &logical_rect);
if (logical_rect.height <= height)
width = logical_rect.width;
else
{
gint mid_width = (perfect_width + width) / 2;
if (mid_width > perfect_width)
{
pango_layout_set_width (label->layout, mid_width);
pango_layout_get_extents (label->layout, NULL, &logical_rect);
if (logical_rect.height <= height)
width = logical_rect.width;
}
}
}
}
pango_layout_set_width (label->layout, width);
}
}
else /* !label->wrap */
pango_layout_set_width (label->layout, -1);
}
}
static void
gtk_label_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkLabel *label;
gint width, height;
PangoRectangle logical_rect;
GtkWidgetAuxInfo *aux_info;
g_return_if_fail (GTK_IS_LABEL (widget));
g_return_if_fail (requisition != NULL);
label = GTK_LABEL (widget);
/*
* If word wrapping is on, then the height requisition can depend
* on:
*
* - Any width set on the widget via gtk_widget_set_usize().
* - The padding of the widget (xpad, set by gtk_misc_set_padding)
*
* Instead of trying to detect changes to these quantities, if we
* are wrapping, we just rewrap for each size request. Since
* size requisitions are cached by the GTK+ core, this is not
* expensive.
*/
if (label->wrap)
gtk_label_clear_layout (label);
gtk_label_ensure_layout (label);
width = label->misc.xpad * 2;
height = label->misc.ypad * 2;
pango_layout_get_extents (label->layout, NULL, &logical_rect);
aux_info = _gtk_widget_get_aux_info (widget, FALSE);
if (label->wrap && aux_info && aux_info->width > 0)
width += aux_info->width;
else
width += PANGO_PIXELS (logical_rect.width);
height += PANGO_PIXELS (logical_rect.height);
requisition->width = width;
requisition->height = height;
}
static void
gtk_label_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkLabel *label;
label = GTK_LABEL (widget);
(* GTK_WIDGET_CLASS (parent_class)->size_allocate) (widget, allocation);
if (label->select_info && label->select_info->window)
{
gdk_window_move_resize (label->select_info->window,
allocation->x,
allocation->y,
allocation->width,
allocation->height);
}
}
static void
gtk_label_state_changed (GtkWidget *widget,
GtkStateType prev_state)
{
GtkLabel *label;
label = GTK_LABEL (widget);
if (label->select_info)
gtk_label_select_region (label, 0, 0);
if (GTK_WIDGET_CLASS (parent_class)->state_changed)
GTK_WIDGET_CLASS (parent_class)->state_changed (widget, prev_state);
}
static void
gtk_label_style_set (GtkWidget *widget,
GtkStyle *previous_style)
{
GtkLabel *label;
g_return_if_fail (GTK_IS_LABEL (widget));
label = GTK_LABEL (widget);
/* We have to clear the layout, fonts etc. may have changed */
gtk_label_clear_layout (label);
}
static void
gtk_label_direction_changed (GtkWidget *widget,
GtkTextDirection previous_dir)
{
GtkLabel *label = GTK_LABEL (widget);
if (label->layout)
pango_layout_context_changed (label->layout);
GTK_WIDGET_CLASS (parent_class)->direction_changed (widget, previous_dir);
}
#if 0
static void
gtk_label_paint_word (GtkLabel *label,
gint x,
gint y,
GtkLabelWord *word,
GdkRectangle *area)
{
GtkWidget *widget = GTK_WIDGET (label);
GtkLabelULine *uline;
gchar *tmp_str;
tmp_str = gdk_wcstombs (word->beginning);
if (tmp_str)
{
gtk_paint_string (widget->style, widget->window, widget->state,
area, widget, "label",
x + word->x,
y + word->y,
tmp_str);
g_free (tmp_str);
}
for (uline = word->uline; uline; uline = uline->next)
gtk_paint_hline (widget->style, widget->window,
widget->state, area,
widget, "label",
x + uline->x1, x + uline->x2, y + uline->y);
}
#endif
static void
get_layout_location (GtkLabel *label,
gint *xp,
gint *yp)
{
GtkMisc *misc;
GtkWidget *widget;
gfloat xalign;
gint x, y;
misc = GTK_MISC (label);
widget = GTK_WIDGET (label);
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
xalign = misc->xalign;
else
xalign = 1.0 - misc->xalign;
x = floor (widget->allocation.x + (gint)misc->xpad +
xalign * (widget->allocation.width - widget->requisition.width)
+ 0.5);
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
x = MAX (x, widget->allocation.x + misc->xpad);
else
x = MIN (x,
widget->allocation.x + widget->allocation.width -
widget->requisition.width - misc->xpad);
y = floor (widget->allocation.y + (gint)misc->ypad
+ MAX (((widget->allocation.height - widget->requisition.height) * misc->yalign)
+ 0.5, 0));
if (xp)
*xp = x;
if (yp)
*yp = y;
}
static void
draw_insertion_cursor (GtkLabel *label,
GdkRectangle *cursor_location,
gboolean is_primary,
PangoDirection direction,
gboolean draw_arrow)
{
GtkWidget *widget = GTK_WIDGET (label);
GtkTextDirection text_dir;
if (direction == PANGO_DIRECTION_LTR)
text_dir = GTK_TEXT_DIR_LTR;
else
text_dir = GTK_TEXT_DIR_RTL;
gtk_draw_insertion_cursor (widget, widget->window, NULL,
cursor_location,
is_primary, text_dir, draw_arrow);
}
static PangoDirection
get_cursor_direction (GtkLabel *label)
{
GSList *l;
g_assert (label->select_info);
gtk_label_ensure_layout (label);
for (l = pango_layout_get_lines (label->layout); l; l = l->next)
{
PangoLayoutLine *line = l->data;
/* If label->select_info->selection_end is at the very end of
* the line, we don't know if the cursor is on this line or
* the next without looking ahead at the next line. (End
* of paragraph is different from line break.) But it's
* definitely in this paragraph, which is good enough
* to figure out the resolved direction.
*/
if (line->start_index + line->length >= label->select_info->selection_end)
return line->resolved_dir;
}
return PANGO_DIRECTION_LTR;
}
static void
gtk_label_draw_cursor (GtkLabel *label, gint xoffset, gint yoffset)
{
if (label->select_info == NULL)
return;
if (GTK_WIDGET_DRAWABLE (label))
{
GtkWidget *widget = GTK_WIDGET (label);
PangoDirection keymap_direction;
PangoDirection cursor_direction;
PangoRectangle strong_pos, weak_pos;
gboolean split_cursor;
PangoRectangle *cursor1 = NULL;
PangoRectangle *cursor2 = NULL;
GdkRectangle cursor_location;
PangoDirection dir1 = PANGO_DIRECTION_NEUTRAL;
PangoDirection dir2 = PANGO_DIRECTION_NEUTRAL;
keymap_direction = gdk_keymap_get_direction (gdk_keymap_get_for_display (gtk_widget_get_display (widget)));
cursor_direction = get_cursor_direction (label);
gtk_label_ensure_layout (label);
pango_layout_get_cursor_pos (label->layout, label->select_info->selection_end,
&strong_pos, &weak_pos);
g_object_get (gtk_widget_get_settings (widget),
"gtk-split-cursor", &split_cursor,
NULL);
dir1 = cursor_direction;
if (split_cursor)
{
cursor1 = &strong_pos;
if (strong_pos.x != weak_pos.x ||
strong_pos.y != weak_pos.y)
{
dir2 = (cursor_direction == PANGO_DIRECTION_LTR) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
cursor2 = &weak_pos;
}
}
else
{
if (keymap_direction == cursor_direction)
cursor1 = &strong_pos;
else
cursor1 = &weak_pos;
}
cursor_location.x = xoffset + PANGO_PIXELS (cursor1->x);
cursor_location.y = yoffset + PANGO_PIXELS (cursor1->y);
cursor_location.width = 0;
cursor_location.height = PANGO_PIXELS (cursor1->height);
draw_insertion_cursor (label,
&cursor_location, TRUE, dir1,
dir2 != PANGO_DIRECTION_NEUTRAL);
if (dir2 != PANGO_DIRECTION_NEUTRAL)
{
cursor_location.x = xoffset + PANGO_PIXELS (cursor2->x);
cursor_location.y = yoffset + PANGO_PIXELS (cursor2->y);
cursor_location.width = 0;
cursor_location.height = PANGO_PIXELS (cursor2->height);
draw_insertion_cursor (label,
&cursor_location, FALSE, dir2,
TRUE);
}
}
}
static gint
gtk_label_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkLabel *label;
gint x, y;
g_return_val_if_fail (GTK_IS_LABEL (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
label = GTK_LABEL (widget);
gtk_label_ensure_layout (label);
if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget) &&
label->text && (*label->text != '\0'))
{
get_layout_location (label, &x, &y);
gtk_paint_layout (widget->style,
widget->window,
GTK_WIDGET_STATE (widget),
FALSE,
&event->area,
widget,
"label",
x, y,
label->layout);
if (label->select_info &&
(label->select_info->selection_anchor !=
label->select_info->selection_end))
{
gint range[2];
GdkRegion *clip;
GtkStateType state;
range[0] = label->select_info->selection_anchor;
range[1] = label->select_info->selection_end;
if (range[0] > range[1])
{
gint tmp = range[0];
range[0] = range[1];
range[1] = tmp;
}
clip = gdk_pango_layout_get_clip_region (label->layout,
x, y,
range,
1);
/* FIXME should use gtk_paint, but it can't use a clip
* region
*/
gdk_gc_set_clip_region (widget->style->black_gc, clip);
state = GTK_STATE_SELECTED;
if (!GTK_WIDGET_HAS_FOCUS (widget))
state = GTK_STATE_ACTIVE;
gdk_draw_layout_with_colors (widget->window,
widget->style->black_gc,
x, y,
label->layout,
&widget->style->text[state],
&widget->style->base[state]);
gdk_gc_set_clip_region (widget->style->black_gc, NULL);
gdk_region_destroy (clip);
}
else if (label->select_info && GTK_WIDGET_HAS_FOCUS (widget))
gtk_label_draw_cursor (label, x, y);
}
return FALSE;
}
static void
gtk_label_set_uline_text_internal (GtkLabel *label,
const gchar *str)
{
guint accel_key = GDK_VoidSymbol;
gchar *new_str;
gchar *pattern;
const gchar *src;
gchar *dest, *pattern_dest;
gboolean underscore;
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (str != NULL);
/* Split text into the base text and a separate pattern
* of underscores.
*/
new_str = g_new (gchar, strlen (str) + 1);
pattern = g_new (gchar, g_utf8_strlen (str, -1) + 1);
underscore = FALSE;
if (str == NULL)
str = "";
src = str;
dest = new_str;
pattern_dest = pattern;
while (*src)
{
gunichar c;
gchar *next_src;
c = g_utf8_get_char (src);
if (c == (gunichar)-1)
{
g_warning ("Invalid input string");
g_free (new_str);
g_free (pattern);
return;
}
next_src = g_utf8_next_char (src);
if (underscore)
{
if (c == '_')
*pattern_dest++ = ' ';
else
{
*pattern_dest++ = '_';
if (accel_key == GDK_VoidSymbol)
accel_key = gdk_keyval_to_lower (gdk_unicode_to_keyval (c));
}
while (src < next_src)
*dest++ = *src++;
underscore = FALSE;
}
else
{
if (c == '_')
{
underscore = TRUE;
src = next_src;
}
else
{
while (src < next_src)
*dest++ = *src++;
*pattern_dest++ = ' ';
}
}
}
*dest = 0;
*pattern_dest = 0;
gtk_label_set_text_internal (label, new_str);
gtk_label_set_pattern_internal (label, pattern);
g_free (pattern);
label->mnemonic_keyval = accel_key;
}
guint
gtk_label_parse_uline (GtkLabel *label,
const gchar *str)
{
guint keyval;
guint orig_keyval;
g_return_val_if_fail (GTK_IS_LABEL (label), GDK_VoidSymbol);
g_return_val_if_fail (str != NULL, GDK_VoidSymbol);
orig_keyval = label->mnemonic_keyval;
g_object_freeze_notify (G_OBJECT (label));
gtk_label_set_label_internal (label, g_strdup (str ? str : ""));
gtk_label_set_use_markup_internal (label, FALSE);
gtk_label_set_use_underline_internal (label, TRUE);
gtk_label_recalculate (label);
keyval = label->mnemonic_keyval;
label->mnemonic_keyval = GDK_VoidSymbol;
gtk_label_setup_mnemonic (label, orig_keyval);
g_object_thaw_notify (G_OBJECT (label));
return keyval;
}
/**
* gtk_label_set_text_with_mnemonic:
* @label: a #GtkLabel
* @str: a string
*
* Sets the label's text from the string @str.
* If characters in @str are preceded by an underscore, they are underlined
* indicating that they represent a keyboard accelerator called a mnemonic.
* The mnemonic key can be used to activate another widget, chosen automatically,
* or explicitly using gtk_label_set_mnemonic_widget().
**/
void
gtk_label_set_text_with_mnemonic (GtkLabel *label,
const gchar *str)
{
guint last_keyval;
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (str != NULL);
last_keyval = label->mnemonic_keyval;
g_object_freeze_notify (G_OBJECT (label));
gtk_label_set_label_internal (label, g_strdup (str ? str : ""));
gtk_label_set_use_markup_internal (label, FALSE);
gtk_label_set_use_underline_internal (label, TRUE);
gtk_label_recalculate (label);
gtk_label_setup_mnemonic (label, last_keyval);
g_object_thaw_notify (G_OBJECT (label));
}
static void
gtk_label_realize (GtkWidget *widget)
{
GtkLabel *label;
label = GTK_LABEL (widget);
(* GTK_WIDGET_CLASS (parent_class)->realize) (widget);
if (label->select_info)
gtk_label_create_window (label);
}
static void
gtk_label_unrealize (GtkWidget *widget)
{
GtkLabel *label;
label = GTK_LABEL (widget);
if (label->select_info)
gtk_label_destroy_window (label);
(* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
static void
gtk_label_map (GtkWidget *widget)
{
GtkLabel *label;
label = GTK_LABEL (widget);
(* GTK_WIDGET_CLASS (parent_class)->map) (widget);
if (label->select_info)
gdk_window_show (label->select_info->window);
}
static void
gtk_label_unmap (GtkWidget *widget)
{
GtkLabel *label;
label = GTK_LABEL (widget);
if (label->select_info)
gdk_window_hide (label->select_info->window);
(* GTK_WIDGET_CLASS (parent_class)->unmap) (widget);
}
static void
window_to_layout_coords (GtkLabel *label,
gint *x,
gint *y)
{
gint lx, ly;
GtkWidget *widget;
widget = GTK_WIDGET (label);
/* get layout location in widget->window coords */
get_layout_location (label, &lx, &ly);
if (x)
{
*x += widget->allocation.x; /* go to widget->window */
*x -= lx; /* go to layout */
}
if (y)
{
*y += widget->allocation.y; /* go to widget->window */
*y -= ly; /* go to layout */
}
}
#if 0
static void
layout_to_window_coords (GtkLabel *label,
gint *x,
gint *y)
{
gint lx, ly;
GtkWidget *widget;
widget = GTK_WIDGET (label);
/* get layout location in widget->window coords */
get_layout_location (label, &lx, &ly);
if (x)
{
*x += lx; /* go to widget->window */
*x -= widget->allocation.x; /* go to selection window */
}
if (y)
{
*y += ly; /* go to widget->window */
*y -= widget->allocation.y; /* go to selection window */
}
}
#endif
static void
get_layout_index (GtkLabel *label,
gint x,
gint y,
gint *index)
{
gint trailing = 0;
const gchar *cluster;
const gchar *cluster_end;
*index = 0;
gtk_label_ensure_layout (label);
window_to_layout_coords (label, &x, &y);
x *= PANGO_SCALE;
y *= PANGO_SCALE;
pango_layout_xy_to_index (label->layout,
x, y,
index, &trailing);
cluster = label->text + *index;
cluster_end = cluster;
while (trailing)
{
cluster_end = g_utf8_next_char (cluster_end);
--trailing;
}
*index += (cluster_end - cluster);
}
static void
gtk_label_select_word (GtkLabel *label)
{
gint min, max;
gint start_index = gtk_label_move_backward_word (label, label->select_info->selection_end);
gint end_index = gtk_label_move_forward_word (label, label->select_info->selection_end);
min = MIN (label->select_info->selection_anchor,
label->select_info->selection_end);
max = MAX (label->select_info->selection_anchor,
label->select_info->selection_end);
min = MIN (min, start_index);
max = MAX (max, end_index);
gtk_label_select_region_index (label, min, max);
}
static gboolean
gtk_label_button_press (GtkWidget *widget,
GdkEventButton *event)
{
GtkLabel *label;
gint index = 0;
label = GTK_LABEL (widget);
if (label->select_info == NULL)
return FALSE;
if (event->button == 1)
{
if (!GTK_WIDGET_HAS_FOCUS (widget))
gtk_widget_grab_focus (widget);
if (event->type == GDK_3BUTTON_PRESS)
{
gtk_label_select_region_index (label, 0, strlen (label->text));
return TRUE;
}
if (event->type == GDK_2BUTTON_PRESS)
{
gtk_label_select_word (label);
return TRUE;
}
get_layout_index (label, event->x, event->y, &index);
if ((label->select_info->selection_anchor !=
label->select_info->selection_end) &&
(event->state & GDK_SHIFT_MASK))
{
gint min, max;
/* extend (same as motion) */
min = MIN (label->select_info->selection_anchor,
label->select_info->selection_end);
max = MAX (label->select_info->selection_anchor,
label->select_info->selection_end);
min = MIN (min, index);
max = MAX (max, index);
/* ensure the anchor is opposite index */
if (index == min)
{
gint tmp = min;
min = max;
max = tmp;
}
gtk_label_select_region_index (label, min, max);
}
else
{
if (event->type == GDK_3BUTTON_PRESS)
gtk_label_select_region_index (label, 0, strlen (label->text));
else if (event->type == GDK_2BUTTON_PRESS)
gtk_label_select_word (label);
else
/* start a replacement */
gtk_label_select_region_index (label, index, index);
}
return TRUE;
}
else if (event->button == 3 && event->type == GDK_BUTTON_PRESS)
{
gtk_label_do_popup (label, event);
return TRUE;
}
return FALSE;
}
static gboolean
gtk_label_button_release (GtkWidget *widget,
GdkEventButton *event)
{
GtkLabel *label;
label = GTK_LABEL (widget);
if (label->select_info == NULL)
return FALSE;
if (event->button != 1)
return FALSE;
/* The goal here is to return TRUE iff we ate the
* button press to start selecting.
*/
return TRUE;
}
static gboolean
gtk_label_motion (GtkWidget *widget,
GdkEventMotion *event)
{
GtkLabel *label;
gint index;
gint x, y;
label = GTK_LABEL (widget);
if (label->select_info == NULL)
return FALSE;
if ((event->state & GDK_BUTTON1_MASK) == 0)
return FALSE;
gdk_window_get_pointer (label->select_info->window,
&x, &y, NULL);
get_layout_index (label, x, y, &index);
gtk_label_select_region_index (label,
label->select_info->selection_anchor,
index);
return TRUE;
}
static void
gtk_label_create_window (GtkLabel *label)
{
GtkWidget *widget;
GdkWindowAttr attributes;
gint attributes_mask;
g_assert (label->select_info);
g_assert (GTK_WIDGET_REALIZED (label));
if (label->select_info->window)
return;
widget = GTK_WIDGET (label);
attributes.x = widget->allocation.x;
attributes.y = widget->allocation.y;
attributes.width = widget->allocation.width;
attributes.height = widget->allocation.height;
attributes.window_type = GDK_WINDOW_TEMP;
attributes.wclass = GDK_INPUT_ONLY;
attributes.override_redirect = TRUE;
attributes.cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
GDK_XTERM);
attributes.event_mask = gtk_widget_get_events (widget) |
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_MOTION_MASK;
attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_NOREDIR | GDK_WA_CURSOR;
label->select_info->window = gdk_window_new (widget->window,
&attributes, attributes_mask);
gdk_window_set_user_data (label->select_info->window, widget);
gdk_cursor_unref (attributes.cursor);
}
static void
gtk_label_destroy_window (GtkLabel *label)
{
g_assert (label->select_info);
if (label->select_info->window == NULL)
return;
gdk_window_set_user_data (label->select_info->window, NULL);
gdk_window_destroy (label->select_info->window);
label->select_info->window = NULL;
}
/**
* gtk_label_set_selectable:
* @label: a #GtkLabel
* @setting: %TRUE to allow selecting text in the label
*
* Selectable labels allow the user to select text from the label, for
* copy-and-paste.
*
**/
void
gtk_label_set_selectable (GtkLabel *label,
gboolean setting)
{
gboolean old_setting;
g_return_if_fail (GTK_IS_LABEL (label));
setting = setting != FALSE;
old_setting = label->select_info != NULL;
if (setting)
{
if (label->select_info == NULL)
{
label->select_info = g_new0 (GtkLabelSelectionInfo, 1);
GTK_WIDGET_SET_FLAGS (label, GTK_CAN_FOCUS);
if (GTK_WIDGET_REALIZED (label))
gtk_label_create_window (label);
if (GTK_WIDGET_MAPPED (label))
gdk_window_show (label->select_info->window);
}
}
else
{
if (label->select_info)
{
/* unselect, to give up the selection */
gtk_label_select_region (label, 0, 0);
if (label->select_info->window)
{
gtk_label_destroy_window (label);
}
g_free (label->select_info);
label->select_info = NULL;
GTK_WIDGET_UNSET_FLAGS (label, GTK_CAN_FOCUS);
}
}
if (setting != old_setting)
{
g_object_freeze_notify (G_OBJECT (label));
g_object_notify (G_OBJECT (label), "selectable");
g_object_notify (G_OBJECT (label), "cursor_position");
g_object_notify (G_OBJECT (label), "selection_bound");
g_object_thaw_notify (G_OBJECT (label));
gtk_widget_queue_draw (GTK_WIDGET (label));
}
}
/**
* gtk_label_get_selectable:
* @label: a #GtkLabel
*
* Gets the value set by gtk_label_set_selectable().
*
* Return value: %TRUE if the user can copy text from the label
**/
gboolean
gtk_label_get_selectable (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), FALSE);
return label->select_info != NULL;
}
static void
get_text_callback (GtkClipboard *clipboard,
GtkSelectionData *selection_data,
guint info,
gpointer user_data_or_owner)
{
GtkLabel *label;
label = GTK_LABEL (user_data_or_owner);
if ((label->select_info->selection_anchor !=
label->select_info->selection_end) &&
label->text)
{
gint start, end;
gint len;
start = MIN (label->select_info->selection_anchor,
label->select_info->selection_end);
end = MAX (label->select_info->selection_anchor,
label->select_info->selection_end);
len = strlen (label->text);
if (end > len)
end = len;
if (start > len)
start = len;
gtk_selection_data_set_text (selection_data,
label->text + start,
end - start);
}
}
static void
clear_text_callback (GtkClipboard *clipboard,
gpointer user_data_or_owner)
{
GtkLabel *label;
label = GTK_LABEL (user_data_or_owner);
if (label->select_info)
{
label->select_info->selection_anchor = label->select_info->selection_end;
gtk_widget_queue_draw (GTK_WIDGET (label));
}
}
static void
gtk_label_select_region_index (GtkLabel *label,
gint anchor_index,
gint end_index)
{
static const GtkTargetEntry targets[] = {
{ "STRING", 0, 0 },
{ "TEXT", 0, 0 },
{ "COMPOUND_TEXT", 0, 0 },
{ "UTF8_STRING", 0, 0 }
};
g_return_if_fail (GTK_IS_LABEL (label));
if (label->select_info)
{
GtkClipboard *clipboard;
if (label->select_info->selection_anchor == anchor_index &&
label->select_info->selection_end == end_index)
return;
label->select_info->selection_anchor = anchor_index;
label->select_info->selection_end = end_index;
clipboard = gtk_widget_get_clipboard (GTK_WIDGET (label),
GDK_SELECTION_PRIMARY);
if (anchor_index != end_index)
{
gtk_clipboard_set_with_owner (clipboard,
targets,
G_N_ELEMENTS (targets),
get_text_callback,
clear_text_callback,
G_OBJECT (label));
}
else
{
if (gtk_clipboard_get_owner (clipboard) == G_OBJECT (label))
gtk_clipboard_clear (clipboard);
}
gtk_widget_queue_draw (GTK_WIDGET (label));
g_object_freeze_notify (G_OBJECT (label));
g_object_notify (G_OBJECT (label), "cursor_position");
g_object_notify (G_OBJECT (label), "selection_bound");
g_object_thaw_notify (G_OBJECT (label));
}
}
/**
* gtk_label_select_region:
* @label: a #GtkLabel
* @start_offset: start offset (in characters not bytes)
* @end_offset: end offset (in characters not bytes)
*
* Selects a range of characters in the label, if the label is selectable.
* See gtk_label_set_selectable(). If the label is not selectable,
* this function has no effect. If @start_offset or
* @end_offset are -1, then the end of the label will be substituted.
*
**/
void
gtk_label_select_region (GtkLabel *label,
gint start_offset,
gint end_offset)
{
g_return_if_fail (GTK_IS_LABEL (label));
if (label->text && label->select_info)
{
if (start_offset < 0)
start_offset = g_utf8_strlen (label->text, -1);
if (end_offset < 0)
end_offset = g_utf8_strlen (label->text, -1);
gtk_label_select_region_index (label,
g_utf8_offset_to_pointer (label->text, start_offset) - label->text,
g_utf8_offset_to_pointer (label->text, end_offset) - label->text);
}
}
/**
* gtk_label_get_selection_bounds:
* @label: a #GtkLabel
* @start: return location for start of selection, as a character offset
* @end: return location for end of selection, as a character offset
*
* Gets the selected range of characters in the label, returning %TRUE
* if there's a selection.
*
* Return value: %TRUE if selection is non-empty
**/
gboolean
gtk_label_get_selection_bounds (GtkLabel *label,
gint *start,
gint *end)
{
g_return_val_if_fail (GTK_IS_LABEL (label), FALSE);
if (label->select_info == NULL)
{
/* not a selectable label */
if (start)
*start = 0;
if (end)
*end = 0;
return FALSE;
}
else
{
gint start_index, end_index;
gint start_offset, end_offset;
gint len;
start_index = MIN (label->select_info->selection_anchor,
label->select_info->selection_end);
end_index = MAX (label->select_info->selection_anchor,
label->select_info->selection_end);
len = strlen (label->text);
if (end_index > len)
end_index = len;
if (start_index > len)
start_index = len;
start_offset = g_utf8_strlen (label->text, start_index);
end_offset = g_utf8_strlen (label->text, end_index);
if (start_offset > end_offset)
{
gint tmp = start_offset;
start_offset = end_offset;
end_offset = tmp;
}
if (start)
*start = start_offset;
if (end)
*end = end_offset;
return start_offset != end_offset;
}
}
/**
* gtk_label_get_layout:
* @label: a #GtkLabel
*
* Gets the #PangoLayout used to display the label.
* The layout is useful to e.g. convert text positions to
* pixel positions, in combination with gtk_label_get_layout_offsets().
* The returned layout is owned by the label so need not be
* freed by the caller.
*
* Return value: the #PangoLayout for this label
**/
PangoLayout*
gtk_label_get_layout (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), NULL);
gtk_label_ensure_layout (label);
return label->layout;
}
/**
* gtk_label_get_layout_offsets:
* @label: a #GtkLabel
* @x: location to store X offset of layout, or %NULL
* @y: location to store Y offset of layout, or %NULL
*
* Obtains the coordinates where the label will draw the #PangoLayout
* representing the text in the label; useful to convert mouse events
* into coordinates inside the #PangoLayout, e.g. to take some action
* if some part of the label is clicked. Of course you will need to
* create a #GtkEventBox to receive the events, and pack the label
* inside it, since labels are a #GTK_NO_WINDOW widget. Remember
* when using the #PangoLayout functions you need to convert to
* and from pixels using PANGO_PIXELS() or #PANGO_SCALE.
*
**/
void
gtk_label_get_layout_offsets (GtkLabel *label,
gint *x,
gint *y)
{
g_return_if_fail (GTK_IS_LABEL (label));
get_layout_location (label, x, y);
}
/**
* gtk_label_set_use_markup:
* @label: a #GtkLabel
* @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>. See gtk_label_set_markup().
**/
void
gtk_label_set_use_markup (GtkLabel *label,
gboolean setting)
{
g_return_if_fail (GTK_IS_LABEL (label));
gtk_label_set_use_markup_internal (label, setting);
gtk_label_recalculate (label);
}
/**
* gtk_label_get_use_markup:
* @label: a #GtkLabel
*
* Returns whether the label's text is interpreted as marked up with
* the <link linkend="PangoMarkupFormat">Pango text markup
* language</link>. See gtk_label_set_use_markup ().
*
* Return value: %TRUE if the label's text will be parsed for markup.
**/
gboolean
gtk_label_get_use_markup (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), FALSE);
return label->use_markup;
}
/**
* gtk_label_set_use_underline:
* @label: a #GtkLabel
* @setting: %TRUE if underlines in the text indicate mnemonics
*
* If true, an underline in the text indicates the next character should be
* used for the mnemonic accelerator key.
*/
void
gtk_label_set_use_underline (GtkLabel *label,
gboolean setting)
{
g_return_if_fail (GTK_IS_LABEL (label));
gtk_label_set_use_underline_internal (label, setting);
gtk_label_recalculate (label);
if (label->use_underline)
gtk_label_setup_mnemonic (label, label->mnemonic_keyval);
}
/**
* gtk_label_get_use_underline:
* @label: a #GtkLabel
*
* Returns whether an embedded underline in the label indicates a
* mnemonic. See gtk_label_set_use_underline ().
*
* Return value: %TRUE whether an embedded underline in the label indicates
* the mnemonic accelerator keys.
**/
gboolean
gtk_label_get_use_underline (GtkLabel *label)
{
g_return_val_if_fail (GTK_IS_LABEL (label), FALSE);
return label->use_underline;
}
/* Compute the X position for an offset that corresponds to the "more important
* cursor position for that offset. We use this when trying to guess to which
* end of the selection we should go to when the user hits the left or
* right arrow key.
*/
static void
get_better_cursor (GtkLabel *label,
gint index,
gint *x,
gint *y)
{
GdkKeymap *keymap = gdk_keymap_get_for_display (gtk_widget_get_display (GTK_WIDGET (label)));
PangoDirection keymap_direction = gdk_keymap_get_direction (keymap);
PangoDirection cursor_direction = get_cursor_direction (label);
gboolean split_cursor;
PangoRectangle strong_pos, weak_pos;
g_object_get (gtk_widget_get_settings (GTK_WIDGET (label)),
"gtk-split-cursor", &split_cursor,
NULL);
gtk_label_ensure_layout (label);
pango_layout_get_cursor_pos (label->layout, index,
&strong_pos, &weak_pos);
if (split_cursor)
{
*x = strong_pos.x / PANGO_SCALE;
*y = strong_pos.y / PANGO_SCALE;
}
else
{
if (keymap_direction == cursor_direction)
{
*x = strong_pos.x / PANGO_SCALE;
*y = strong_pos.y / PANGO_SCALE;
}
else
{
*x = weak_pos.x / PANGO_SCALE;
*y = weak_pos.y / PANGO_SCALE;
}
}
}
static gint
gtk_label_move_logically (GtkLabel *label,
gint start,
gint count)
{
gint offset = g_utf8_pointer_to_offset (label->text,
label->text + start);
if (label->text)
{
PangoLogAttr *log_attrs;
gint n_attrs;
gint length;
gtk_label_ensure_layout (label);
length = g_utf8_strlen (label->text, -1);
pango_layout_get_log_attrs (label->layout, &log_attrs, &n_attrs);
while (count > 0 && offset < length)
{
do
offset++;
while (offset < length && !log_attrs[offset].is_cursor_position);
count--;
}
while (count < 0 && offset > 0)
{
do
offset--;
while (offset > 0 && !log_attrs[offset].is_cursor_position);
count++;
}
g_free (log_attrs);
}
return g_utf8_offset_to_pointer (label->text, offset) - label->text;
}
static gint
gtk_label_move_visually (GtkLabel *label,
gint start,
gint count)
{
gint index;
index = start;
while (count != 0)
{
int new_index, new_trailing;
gboolean split_cursor;
gboolean strong;
gtk_label_ensure_layout (label);
g_object_get (gtk_widget_get_settings (GTK_WIDGET (label)),
"gtk-split-cursor", &split_cursor,
NULL);
if (split_cursor)
strong = TRUE;
else
{
GdkKeymap *keymap = gdk_keymap_get_for_display (gtk_widget_get_display (GTK_WIDGET (label)));
PangoDirection keymap_direction = gdk_keymap_get_direction (keymap);
strong = keymap_direction == get_cursor_direction (label);
}
if (count > 0)
{
pango_layout_move_cursor_visually (label->layout, strong, index, 0, 1, &new_index, &new_trailing);
count--;
}
else
{
pango_layout_move_cursor_visually (label->layout, strong, index, 0, -1, &new_index, &new_trailing);
count++;
}
if (new_index < 0 || new_index == G_MAXINT)
break;
index = new_index;
while (new_trailing--)
index = g_utf8_next_char (label->text + new_index) - label->text;
}
return index;
}
static gint
gtk_label_move_forward_word (GtkLabel *label,
gint start)
{
gint new_pos = g_utf8_pointer_to_offset (label->text,
label->text + start);
gint length;
length = g_utf8_strlen (label->text, -1);
if (new_pos < length)
{
PangoLogAttr *log_attrs;
gint n_attrs;
gtk_label_ensure_layout (label);
pango_layout_get_log_attrs (label->layout, &log_attrs, &n_attrs);
/* Find the next word end */
new_pos++;
while (new_pos < n_attrs && !log_attrs[new_pos].is_word_end)
new_pos++;
g_free (log_attrs);
}
return g_utf8_offset_to_pointer (label->text, new_pos) - label->text;
}
static gint
gtk_label_move_backward_word (GtkLabel *label,
gint start)
{
gint new_pos = g_utf8_pointer_to_offset (label->text,
label->text + start);
gint length;
length = g_utf8_strlen (label->text, -1);
if (new_pos > 0)
{
PangoLogAttr *log_attrs;
gint n_attrs;
gtk_label_ensure_layout (label);
pango_layout_get_log_attrs (label->layout, &log_attrs, &n_attrs);
new_pos -= 1;
/* Find the previous word beginning */
while (new_pos > 0 && !log_attrs[new_pos].is_word_start)
new_pos--;
g_free (log_attrs);
}
return g_utf8_offset_to_pointer (label->text, new_pos) - label->text;
}
static void
gtk_label_move_cursor (GtkLabel *label,
GtkMovementStep step,
gint count,
gboolean extend_selection)
{
gint new_pos;
if (label->select_info == NULL)
return;
new_pos = label->select_info->selection_end;
if (label->select_info->selection_end != label->select_info->selection_anchor &&
!extend_selection)
{
/* If we have a current selection and aren't extending it, move to the
* start/or end of the selection as appropriate
*/
switch (step)
{
case GTK_MOVEMENT_VISUAL_POSITIONS:
{
gint end_x, end_y;
gint anchor_x, anchor_y;
gboolean end_is_left;
get_better_cursor (label, label->select_info->selection_end, &end_x, &end_y);
get_better_cursor (label, label->select_info->selection_anchor, &anchor_x, &anchor_y);
end_is_left = (end_y < anchor_y) || (end_y == anchor_y && end_x < anchor_x);
if (count < 0)
new_pos = end_is_left ? label->select_info->selection_end : label->select_info->selection_anchor;
else
new_pos = !end_is_left ? label->select_info->selection_end : label->select_info->selection_anchor;
break;
}
case GTK_MOVEMENT_LOGICAL_POSITIONS:
case GTK_MOVEMENT_WORDS:
if (count < 0)
new_pos = MIN (label->select_info->selection_end, label->select_info->selection_anchor);
else
new_pos = MAX (label->select_info->selection_end, label->select_info->selection_anchor);
break;
case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
case GTK_MOVEMENT_PARAGRAPH_ENDS:
case GTK_MOVEMENT_BUFFER_ENDS:
/* FIXME: Can do better here */
new_pos = count < 0 ? 0 : strlen (label->text);
break;
case GTK_MOVEMENT_DISPLAY_LINES:
case GTK_MOVEMENT_PARAGRAPHS:
case GTK_MOVEMENT_PAGES:
case GTK_MOVEMENT_HORIZONTAL_PAGES:
break;
}
}
else
{
switch (step)
{
case GTK_MOVEMENT_LOGICAL_POSITIONS:
new_pos = gtk_label_move_logically (label, new_pos, count);
break;
case GTK_MOVEMENT_VISUAL_POSITIONS:
new_pos = gtk_label_move_visually (label, new_pos, count);
break;
case GTK_MOVEMENT_WORDS:
while (count > 0)
{
new_pos = gtk_label_move_forward_word (label, new_pos);
count--;
}
while (count < 0)
{
new_pos = gtk_label_move_backward_word (label, new_pos);
count++;
}
break;
case GTK_MOVEMENT_DISPLAY_LINE_ENDS:
case GTK_MOVEMENT_PARAGRAPH_ENDS:
case GTK_MOVEMENT_BUFFER_ENDS:
/* FIXME: Can do better here */
new_pos = count < 0 ? 0 : strlen (label->text);
break;
case GTK_MOVEMENT_DISPLAY_LINES:
case GTK_MOVEMENT_PARAGRAPHS:
case GTK_MOVEMENT_PAGES:
case GTK_MOVEMENT_HORIZONTAL_PAGES:
break;
}
}
if (extend_selection)
gtk_label_select_region_index (label,
label->select_info->selection_anchor,
new_pos);
else
gtk_label_select_region_index (label, new_pos, new_pos);
}
static void
gtk_label_copy_clipboard (GtkLabel *label)
{
if (label->text && label->select_info)
{
gint start, end;
gint len;
start = MIN (label->select_info->selection_anchor,
label->select_info->selection_end);
end = MAX (label->select_info->selection_anchor,
label->select_info->selection_end);
len = strlen (label->text);
if (end > len)
end = len;
if (start > len)
start = len;
if (start != end)
gtk_clipboard_set_text (gtk_widget_get_clipboard (GTK_WIDGET (label),
GDK_SELECTION_CLIPBOARD),
label->text + start, end - start);
}
}
static void
gtk_label_select_all (GtkLabel *label)
{
gtk_label_select_region_index (label, 0, strlen (label->text));
}
/* Quick hack of a popup menu
*/
static void
activate_cb (GtkWidget *menuitem,
GtkLabel *label)
{
const gchar *signal = g_object_get_data (G_OBJECT (menuitem), "gtk-signal");
g_signal_emit_by_name (label, signal);
}
static void
append_action_signal (GtkLabel *label,
GtkWidget *menu,
const gchar *stock_id,
const gchar *signal,
gboolean sensitive)
{
GtkWidget *menuitem = gtk_image_menu_item_new_from_stock (stock_id, NULL);
g_object_set_data (G_OBJECT (menuitem), "gtk-signal", (char *)signal);
g_signal_connect (menuitem, "activate",
G_CALLBACK (activate_cb), label);
gtk_widget_set_sensitive (menuitem, sensitive);
gtk_widget_show (menuitem);
gtk_menu_shell_append (GTK_MENU_SHELL (menu), menuitem);
}
static void
popup_menu_detach (GtkWidget *attach_widget,
GtkMenu *menu)
{
GtkLabel *label;
label = GTK_LABEL (attach_widget);
if (label->select_info)
label->select_info->popup_menu = NULL;
}
static void
popup_position_func (GtkMenu *menu,
gint *x,
gint *y,
gboolean *push_in,
gpointer user_data)
{
GtkLabel *label;
GtkWidget *widget;
GtkRequisition req;
GdkScreen *screen;
label = GTK_LABEL (user_data);
widget = GTK_WIDGET (label);
if (label->select_info == NULL)
return;
g_return_if_fail (GTK_WIDGET_REALIZED (label));
screen = gtk_widget_get_screen (widget);
gdk_window_get_origin (widget->window, x, y);
gtk_widget_size_request (label->select_info->popup_menu, &req);
*x += widget->allocation.width / 2;
*y += widget->allocation.height;
*x = CLAMP (*x, 0, MAX (0, gdk_screen_get_width (screen) - req.width));
*y = CLAMP (*y, 0, MAX (0, gdk_screen_get_height (screen) - req.height));
}
static void
gtk_label_do_popup (GtkLabel *label,
GdkEventButton *event)
{
GtkWidget *menuitem;
gboolean have_selection;
if (label->select_info == NULL)
return;
if (label->select_info->popup_menu)
gtk_widget_destroy (label->select_info->popup_menu);
label->select_info->popup_menu = gtk_menu_new ();
gtk_menu_attach_to_widget (GTK_MENU (label->select_info->popup_menu),
GTK_WIDGET (label),
popup_menu_detach);
have_selection =
label->select_info->selection_anchor != label->select_info->selection_end;
append_action_signal (label, label->select_info->popup_menu, GTK_STOCK_CUT, "cut_clipboard",
FALSE);
append_action_signal (label, label->select_info->popup_menu, GTK_STOCK_COPY, "copy_clipboard",
have_selection);
append_action_signal (label, label->select_info->popup_menu, GTK_STOCK_PASTE, "paste_clipboard",
FALSE);
menuitem = gtk_menu_item_new_with_label (_("Select All"));
g_signal_connect_swapped (menuitem, "activate",
G_CALLBACK (gtk_label_select_all), label);
gtk_widget_show (menuitem);
gtk_menu_shell_append (GTK_MENU_SHELL (label->select_info->popup_menu), menuitem);
menuitem = gtk_separator_menu_item_new ();
gtk_widget_show (menuitem);
gtk_menu_shell_append (GTK_MENU_SHELL (label->select_info->popup_menu), menuitem);
menuitem = gtk_menu_item_new_with_label (_("Input Methods"));
gtk_widget_show (menuitem);
gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), gtk_menu_new ());
gtk_widget_set_sensitive (menuitem, FALSE);
gtk_menu_shell_append (GTK_MENU_SHELL (label->select_info->popup_menu), menuitem);
g_signal_emit (label,
signals[POPULATE_POPUP],
0,
label->select_info->popup_menu);
if (event)
gtk_menu_popup (GTK_MENU (label->select_info->popup_menu), NULL, NULL,
NULL, NULL,
event->button, event->time);
else
gtk_menu_popup (GTK_MENU (label->select_info->popup_menu), NULL, NULL,
popup_position_func, label,
0, gtk_get_current_event_time ());
}
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