/* 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 #include #include "gtklabel.h" #include "gtksignal.h" #include "gtkwindow.h" #include "gdk/gdkkeysyms.h" #include "gtkclipboard.h" #include "gdk/gdki18n.h" #include #include "gtkintl.h" #include "gtkmenuitem.h" #include "gtknotebook.h" struct _GtkLabelSelectionInfo { GdkWindow *window; gint selection_anchor; gint selection_end; }; 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 }; 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 gint gtk_label_button_press (GtkWidget *widget, GdkEventButton *event); static gint gtk_label_button_release (GtkWidget *widget, GdkEventButton *event); static gint 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); 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, gint *widthp, gint *heightp); 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); static GtkMiscClass *parent_class = NULL; GtkType gtk_label_get_type (void) { static GtkType 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 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); parent_class = gtk_type_class (GTK_TYPE_MISC); 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->mnemonic_activate = gtk_label_mnemonic_activate; g_object_class_install_property (G_OBJECT_CLASS(object_class), PROP_LABEL, g_param_spec_string ("label", _("Label"), _("The text of the label."), NULL, G_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, G_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, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_USE_UNDERLINE, g_param_spec_boolean ("use_underline", _("Use underline"), _("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", _("Justification"), _("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", _("Pattern"), _("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", _("Line wrap"), _("If set, wrap lines if the text becomes too wide."), TRUE, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_SELECTABLE, g_param_spec_boolean ("selectable", _("Selectable"), _("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", _("Mnemonic key"), _("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", _("Mnemonic widget"), _("The widget to be activated when the label's mnemonic " "key is pressed."), GTK_TYPE_WIDGET, G_PARAM_READWRITE)); } static void gtk_label_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GtkLabel *label; guint last_keyval; label = GTK_LABEL (object); last_keyval = label->mnemonic_keyval; switch (prop_id) { case PROP_LABEL: gtk_label_set_label_internal (label, g_strdup (g_value_get_string (value))); gtk_label_recalculate (label); if (last_keyval != label->mnemonic_keyval) gtk_label_setup_mnemonic (label, last_keyval); break; case PROP_ATTRIBUTES: gtk_label_set_attributes (label, g_value_get_boxed (value)); break; case PROP_USE_MARKUP: gtk_label_set_use_markup_internal (label, g_value_get_boolean (value)); gtk_label_recalculate (label); break; case PROP_USE_UNDERLINE: gtk_label_set_use_underline_internal (label, g_value_get_boolean (value)); gtk_label_recalculate (label); if (label->use_underline) gtk_label_setup_mnemonic (label, last_keyval); 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; 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_CENTER; 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 * @returns: a new #GtkLabel * * Creates a new #GtkLabel, containing the text in @str. **/ GtkWidget* gtk_label_new (const gchar *str) { GtkLabel *label; label = gtk_type_new (GTK_TYPE_LABEL); 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 * @returns: a new #GtkLabel * * Creates a new #GtkLabel, containing the text in @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(). * * 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. **/ GtkWidget* gtk_label_new_with_mnemonic (const gchar *str) { GtkLabel *label; label = gtk_type_new (GTK_TYPE_LABEL); 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; 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_beep (); 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_IS_WINDOW (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) { GtkLabel *label = GTK_LABEL (widget); gtk_label_setup_mnemonic (label, label->mnemonic_keyval); } /** * 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_unref (label->mnemonic_widget); label->mnemonic_widget = widget; if (label->mnemonic_widget) gtk_widget_ref (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); 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)); gtk_label_set_attributes_internal (label, NULL); } } 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: a string * * Sets the text of the label to @str. * * 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)); 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); } /** * gtk_label_set_attributes: * @label: a #GtkLabel * @attrs: a #PangoAttrList * * Sets a #PangoAttrList; the attributes in the list are applied to the * label text. **/ 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)); } 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) { gtk_label_set_attributes_internal (label, attrs); pango_attr_list_unref (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 Pango markup format) * * Parses @str which is marked up with the Pango text markup language, * 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 Pango markup format) * * Parses @str which is marked up with the Pango text markup language, * 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 * * 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 (label != NULL, NULL); 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); gtk_label_set_attributes_internal (label, 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)); } 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)); } } 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)); } } void gtk_label_get (GtkLabel *label, gchar **str) { g_return_if_fail (label != NULL); 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 (G_OBJECT (label->layout)); if (label->attrs) pango_attr_list_unref (label->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 (G_OBJECT (label->layout)); label->layout = NULL; } } static void gtk_label_ensure_layout (GtkLabel *label, gint *widthp, gint *heightp) { GtkWidget *widget; PangoRectangle logical_rect; gint rwidth, rheight; widget = GTK_WIDGET (label); /* * There are a number of conditions which will necessitate re-filling * our text: * * 1. text changed. * 2. justification changed either from to to GTK_JUSTIFY_FILL. * 3. font changed. * * These have been detected elsewhere, and label->words will be zero, * if one of the above has occured. * * Additionally, though, if GTK_JUSTIFY_FILL, we need to re-fill if: * * 4. gtk_widget_set_usize has changed the requested width. * 5. gtk_misc_set_padding has changed xpad. * 6. maybe others?... * * Too much of a pain to detect all these case, so always re-fill. I * don't think it's really that slow. */ 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->attrs) pango_layout_set_attributes (label->layout, label->attrs); switch (label->jtype) { case GTK_JUSTIFY_LEFT: align = PANGO_ALIGN_LEFT; break; case GTK_JUSTIFY_RIGHT: align = PANGO_ALIGN_RIGHT; break; case GTK_JUSTIFY_CENTER: align = PANGO_ALIGN_LEFT; break; case GTK_JUSTIFY_FILL: /* FIXME: This just doesn't work to do this */ align = 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; gint real_width; 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); pango_layout_get_extents (label->layout, NULL, &logical_rect); rwidth += aux_info->width; rheight += PANGO_PIXELS (logical_rect.height); } else { pango_layout_set_width (label->layout, -1); pango_layout_get_extents (label->layout, NULL, &logical_rect); width = logical_rect.width; height = logical_rect.height; /* Try to guess a reasonable maximum width */ longest_paragraph = width; width = MIN (width, PANGO_SCALE * gdk_string_width (GTK_WIDGET (label)->style->font, "This long string gives a good enough length for any line to have.")); width = MIN (width, PANGO_SCALE * (gdk_screen_width () + 1) / 2); pango_layout_set_width (label->layout, width); pango_layout_get_extents (label->layout, NULL, &logical_rect); real_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 = perfect_width; real_width = logical_rect.width; height = logical_rect.height; } 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 = mid_width; real_width = logical_rect.width; height = logical_rect.height; } } } } } pango_layout_set_width (label->layout, width); rwidth += PANGO_PIXELS (real_width); rheight += PANGO_PIXELS (height); } } else /* !label->wrap */ { pango_layout_set_width (label->layout, -1); pango_layout_get_extents (label->layout, NULL, &logical_rect); rwidth += PANGO_PIXELS (logical_rect.width); rheight += PANGO_PIXELS (logical_rect.height); } if (widthp) *widthp = rwidth; if (heightp) *heightp = rheight; } static void gtk_label_size_request (GtkWidget *widget, GtkRequisition *requisition) { GtkLabel *label; gint width, height; g_return_if_fail (GTK_IS_LABEL (widget)); g_return_if_fail (requisition != NULL); label = GTK_LABEL (widget); gtk_label_ensure_layout (label, &width, &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 + ((widget->allocation.width - widget->requisition.width) * xalign) + 0.5); y = floor (widget->allocation.y + (gint)misc->ypad + ((widget->allocation.height - widget->requisition.height) * misc->yalign) + 0.5); if (xp) *xp = x; if (yp) *yp = y; } 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, NULL, NULL); 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; 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->white_gc, clip); gdk_draw_layout_with_colors (widget->window, widget->style->white_gc, x, y, label->layout, &widget->style->fg[GTK_STATE_SELECTED], &widget->style->bg[GTK_STATE_SELECTED]); gdk_gc_set_clip_region (widget->style->white_gc, NULL); gdk_region_destroy (clip); } } return TRUE; } 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); /* Convert text to wide characters */ 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 (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; 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); 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; 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); } 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, NULL, NULL); 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 gint 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) return FALSE; 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)) { /* extend (same as motion) */ if (index < label->select_info->selection_end) gtk_label_select_region_index (label, index, label->select_info->selection_end); else gtk_label_select_region_index (label, label->select_info->selection_anchor, index); /* ensure the anchor is opposite index */ if (index == label->select_info->selection_anchor) { gint tmp = label->select_info->selection_end; label->select_info->selection_end = label->select_info->selection_anchor; label->select_info->selection_anchor = tmp; } } else { /* start a replacement */ gtk_label_select_region_index (label, index, index); } return TRUE; } static gint 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 gint 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.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; label->select_info->window = gdk_window_new (widget->window, &attributes, attributes_mask); gdk_window_set_user_data (label->select_info->window, widget); } 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; } 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_new (GtkLabelSelectionInfo, 1); label->select_info->window = NULL; label->select_info->selection_anchor = 0; label->select_info->selection_end = 0; 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; } } if (setting != old_setting) { g_object_notify (G_OBJECT (label), "selectable"); gtk_widget_queue_draw (GTK_WIDGET (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; gchar *str; 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; str = g_strndup (label->text + start, end - start); gtk_selection_data_set_text (selection_data, str); g_free (str); } } 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 = 0; label->select_info->selection_end = 0; gtk_label_clear_layout (label); 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; label->select_info->selection_anchor = anchor_index; label->select_info->selection_end = end_index; clipboard = gtk_clipboard_get (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_label_clear_layout (label); gtk_widget_queue_draw (GTK_WIDGET (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_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. * **/ 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); }