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92006c8e78
gtk2/gtk/gtklabel.c
PDT 1998 Shawn T. Amundson 92006c8e78 Changed LGPL address for FSF in all .h and .c files 
Sun Apr 12 18:54:29 PDT 1998 Shawn T. Amundson <amundson@gtk.org>

        * Changed LGPL address for FSF in all .h and .c files
1998-04-13 02:02:47 +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 Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <string.h>
#include "gtklabel.h"
enum {
ARG_0,
ARG_LABEL,
ARG_JUSTIFY
};
static void gtk_label_class_init (GtkLabelClass *klass);
static void gtk_label_init (GtkLabel *label);
static void gtk_label_set_arg (GtkLabel *label,
GtkArg *arg,
guint arg_id);
static void gtk_label_get_arg (GtkLabel *label,
GtkArg *arg,
guint arg_id);
static void gtk_label_finalize (GtkObject *object);
static void gtk_label_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static gint gtk_label_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gtk_label_state_changed (GtkWidget *widget,
guint previous_state);
static void gtk_label_style_set (GtkWidget *widget,
GtkStyle *previous_style);
static GtkMiscClass *parent_class = NULL;
guint
gtk_label_get_type ()
{
static guint label_type = 0;
if (!label_type)
{
GtkTypeInfo label_info =
{
"GtkLabel",
sizeof (GtkLabel),
sizeof (GtkLabelClass),
(GtkClassInitFunc) gtk_label_class_init,
(GtkObjectInitFunc) gtk_label_init,
(GtkArgSetFunc) gtk_label_set_arg,
(GtkArgGetFunc) gtk_label_get_arg,
};
label_type = gtk_type_unique (gtk_misc_get_type (), &label_info);
}
return label_type;
}
static void
gtk_label_class_init (GtkLabelClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
parent_class = gtk_type_class (gtk_misc_get_type ());
gtk_object_add_arg_type ("GtkLabel::label", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_LABEL);
gtk_object_add_arg_type ("GtkLabel::justify", GTK_TYPE_ENUM, GTK_ARG_READWRITE, ARG_JUSTIFY);
object_class->finalize = gtk_label_finalize;
widget_class->size_request = gtk_label_size_request;
widget_class->expose_event = gtk_label_expose;
widget_class->style_set = gtk_label_style_set;
widget_class->state_changed = gtk_label_state_changed;
}
static void
gtk_label_set_arg (GtkLabel *label,
GtkArg *arg,
guint arg_id)
{
switch (arg_id)
{
case ARG_LABEL:
gtk_label_set (label, GTK_VALUE_STRING (*arg));
break;
case ARG_JUSTIFY:
gtk_label_set_justify (label, GTK_VALUE_ENUM (*arg));
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static void gtk_label_get_arg (GtkLabel *label,
GtkArg *arg,
guint arg_id)
{
switch (arg_id)
{
case ARG_LABEL:
GTK_VALUE_STRING (*arg) = g_strdup (label->label);
break;
case ARG_JUSTIFY:
GTK_VALUE_ENUM (*arg) = label->jtype;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}
static void
gtk_label_init (GtkLabel *label)
{
GTK_WIDGET_SET_FLAGS (label, GTK_NO_WINDOW);
label->label = NULL;
label->row = NULL;
label->jtype = GTK_JUSTIFY_CENTER;
label->needs_clear = 0;
gtk_label_set (label, "");
}
GtkWidget*
gtk_label_new (const char *str)
{
GtkLabel *label;
g_return_val_if_fail (str != NULL, NULL);
label = gtk_type_new (gtk_label_get_type ());
gtk_label_set (label, str);
return GTK_WIDGET (label);
}
void
gtk_label_set (GtkLabel *label,
const char *str)
{
char* p;
g_return_if_fail (label != NULL);
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (str != NULL);
if (label->label)
g_free (label->label);
label->label = g_strdup (str);
if (label->row)
g_slist_free (label->row);
label->row = NULL;
label->row = g_slist_append (label->row, label->label);
p = label->label;
while ((p = strchr(p, '\n')))
label->row = g_slist_append (label->row, ++p);
if (GTK_WIDGET_VISIBLE (label))
{
if (GTK_WIDGET_MAPPED (label))
gdk_window_clear_area (GTK_WIDGET (label)->window,
GTK_WIDGET (label)->allocation.x,
GTK_WIDGET (label)->allocation.y,
GTK_WIDGET (label)->allocation.width,
GTK_WIDGET (label)->allocation.height);
gtk_widget_queue_resize (GTK_WIDGET (label));
}
}
void
gtk_label_set_justify (GtkLabel *label, GtkJustification jtype)
{
g_return_if_fail (label != NULL);
g_return_if_fail (GTK_IS_LABEL (label));
if ((GtkJustification) label->jtype != jtype)
{
label->jtype = jtype;
if (GTK_WIDGET_VISIBLE (label))
{
if (GTK_WIDGET_MAPPED (label))
gdk_window_clear_area (GTK_WIDGET (label)->window,
GTK_WIDGET (label)->allocation.x,
GTK_WIDGET (label)->allocation.y,
GTK_WIDGET (label)->allocation.width,
GTK_WIDGET (label)->allocation.height);
gtk_widget_queue_resize (GTK_WIDGET (label));
}
}
}
void
gtk_label_get (GtkLabel *label,
char **str)
{
g_return_if_fail (label != NULL);
g_return_if_fail (GTK_IS_LABEL (label));
g_return_if_fail (str != NULL);
*str = label->label;
}
static void
gtk_label_finalize (GtkObject *object)
{
GtkLabel *label;
g_return_if_fail (object != NULL);
g_return_if_fail (GTK_IS_LABEL (object));
label = GTK_LABEL (object);
g_free (label->label);
g_slist_free (label->row);
(* GTK_OBJECT_CLASS (parent_class)->finalize) (object);
}
static void
gtk_label_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkLabel *label;
GSList *row;
gint width;
g_return_if_fail (widget != NULL);
g_return_if_fail (GTK_IS_LABEL (widget));
g_return_if_fail (requisition != NULL);
label = GTK_LABEL (widget);
row = label->row;
width = 0;
while (row)
{
if (row->next)
width = MAX (width,
gdk_text_width (GTK_WIDGET (label)->style->font,
row->data,
(gchar*) row->next->data - (gchar*) row->data) - 1);
else
width = MAX (width, gdk_string_width (GTK_WIDGET (label)->style->font, row->data));
row = row->next;
}
requisition->width = width + label->misc.xpad * 2;
requisition->height = ((GTK_WIDGET (label)->style->font->ascent +
GTK_WIDGET (label)->style->font->descent + 2) *
g_slist_length(label->row) +
label->misc.ypad * 2);
}
static gint
gtk_label_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkLabel *label;
GtkMisc *misc;
GSList *row;
gint state;
gint offset;
gint len;
gint maxl;
gint x, y;
g_return_val_if_fail (widget != NULL, FALSE);
g_return_val_if_fail (GTK_IS_LABEL (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget))
{
label = GTK_LABEL (widget);
misc = GTK_MISC (widget);
state = widget->state;
maxl = widget->requisition.width - misc->xpad * 2;
/*
* GC Clipping
*/
gdk_gc_set_clip_rectangle (widget->style->white_gc, &event->area);
gdk_gc_set_clip_rectangle (widget->style->fg_gc[state], &event->area);
/* We clear the whole allocation here so that if a partial
* expose is triggered we don't just clear part and mess up
* when the queued redraw comes along. (There will always
* be a complete queued redraw when the needs_clear flag
* is set.)
*/
if (label->needs_clear)
{
gdk_window_clear_area (widget->window,
widget->allocation.x,
widget->allocation.y,
widget->allocation.width,
widget->allocation.height);
label->needs_clear = FALSE;
}
x = widget->allocation.x + misc->xpad +
(widget->allocation.width - widget->requisition.width)
* misc->xalign + 0.5;
y = (widget->allocation.y * (1.0 - misc->yalign) +
(widget->allocation.y + widget->allocation.height -
(widget->requisition.height - misc->ypad * 2)) *
misc->yalign + widget->style->font->ascent) + 1.5;
row = label->row;
while (row && row->next)
{
len = (gchar*) row->next->data - (gchar*) row->data - 1;
offset = 0;
if (label->jtype == GTK_JUSTIFY_CENTER)
offset = (maxl - gdk_text_width (widget->style->font, row->data, len)) / 2;
else if (label->jtype == GTK_JUSTIFY_RIGHT)
offset = (maxl - gdk_text_width (widget->style->font, row->data, len));
if (state == GTK_STATE_INSENSITIVE)
gdk_draw_text (widget->window, widget->style->font,
widget->style->white_gc,
offset + x + 1, y + 1, row->data, len);
gdk_draw_text (widget->window, widget->style->font,
widget->style->fg_gc[state],
offset + x, y, row->data, len);
row = row->next;
y += widget->style->font->ascent + widget->style->font->descent + 2;
}
/*
* COMMENT: we can avoid gdk_text_width() calls here storing in label->row
* the widths of the rows calculated in gtk_label_set.
* Once we have a wrapping interface we can support GTK_JUSTIFY_FILL.
*/
offset = 0;
if (label->jtype == GTK_JUSTIFY_CENTER)
offset = (maxl - gdk_string_width (widget->style->font, row->data)) / 2;
else if (label->jtype == GTK_JUSTIFY_RIGHT)
offset = (maxl - gdk_string_width (widget->style->font, row->data));
if (state == GTK_STATE_INSENSITIVE)
gdk_draw_string (widget->window, widget->style->font,
widget->style->white_gc,
offset + x + 1, y + 1, row->data);
gdk_draw_string (widget->window, widget->style->font,
widget->style->fg_gc[state],
offset + x, y, row->data);
gdk_gc_set_clip_mask (widget->style->white_gc, NULL);
gdk_gc_set_clip_mask (widget->style->fg_gc[state], NULL);
}
return TRUE;
}
static void
gtk_label_state_changed (GtkWidget *widget,
guint previous_state)
{
GTK_LABEL (widget)->needs_clear = 1;
}
static void
gtk_label_style_set (GtkWidget *widget,
GtkStyle *previous_style)
{
GTK_LABEL (widget)->needs_clear = 1;
}
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