gtk2/gtk/gtklabel.c
Owen Taylor 0c2240ba37 Add a 'text' argument to set the initial text.
Sun Jul  2 18:19:50 2000  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkwidget.[ch] (gtk_widget_create_pango_layout): Add a 'text' argument to
	set the initial text.

	* gtk/gtkaccellabel.c gtk/gtkcalendar.c gtk/gtkclist.c
	gtk/gtkentry.c gtk/gtkhruler.c gtk/gtkhscale.c gtk/gtklabel.c
	gtk/gtkprogressbar.c gtk/gtkscale.c gtk/gtkvruler.c
	gtk/gtkvscale.c: Adapt to new argument of create_pango_layout().

	* gtk/gtkclist.c (_gtk_clist_create_cell_layout): Use new
	pango_layout_set_font_description to simplify.
2000-07-02 22:30:54 +00:00

713 lines
17 KiB
C

/* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-1999. 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 <math.h>
#include <string.h>
#include "gtklabel.h"
#include "gdk/gdkkeysyms.h"
#include "gdk/gdki18n.h"
#include <pango/pango.h>
enum {
ARG_0,
ARG_LABEL,
ARG_PATTERN,
ARG_JUSTIFY,
ARG_WRAP
};
static void gtk_label_class_init (GtkLabelClass *klass);
static void gtk_label_init (GtkLabel *label);
static void gtk_label_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_label_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id);
static void gtk_label_finalize (GObject *object);
static void gtk_label_size_request (GtkWidget *widget,
GtkRequisition *requisition);
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 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);
}
return label_type;
}
static void
gtk_label_class_init (GtkLabelClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (class);
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = (GtkObjectClass*) class;
widget_class = (GtkWidgetClass*) class;
parent_class = gtk_type_class (GTK_TYPE_MISC);
gtk_object_add_arg_type ("GtkLabel::label", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_LABEL);
gtk_object_add_arg_type ("GtkLabel::pattern", GTK_TYPE_STRING, GTK_ARG_READWRITE, ARG_PATTERN);
gtk_object_add_arg_type ("GtkLabel::justify", GTK_TYPE_JUSTIFICATION, GTK_ARG_READWRITE, ARG_JUSTIFY);
gtk_object_add_arg_type ("GtkLabel::wrap", GTK_TYPE_BOOL, GTK_ARG_READWRITE, ARG_WRAP);
gobject_class->finalize = gtk_label_finalize;
object_class->set_arg = gtk_label_set_arg;
object_class->get_arg = gtk_label_get_arg;
widget_class->size_request = gtk_label_size_request;
widget_class->style_set = gtk_label_style_set;
widget_class->direction_changed = gtk_label_direction_changed;
widget_class->expose_event = gtk_label_expose;
}
static void
gtk_label_set_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkLabel *label;
label = GTK_LABEL (object);
switch (arg_id)
{
case ARG_LABEL:
gtk_label_set_text (label, GTK_VALUE_STRING (*arg));
break;
case ARG_PATTERN:
gtk_label_set_pattern (label, GTK_VALUE_STRING (*arg));
break;
case ARG_JUSTIFY:
gtk_label_set_justify (label, GTK_VALUE_ENUM (*arg));
break;
case ARG_WRAP:
gtk_label_set_line_wrap (label, GTK_VALUE_BOOL (*arg));
break;
default:
break;
}
}
static void
gtk_label_get_arg (GtkObject *object,
GtkArg *arg,
guint arg_id)
{
GtkLabel *label;
label = GTK_LABEL (object);
switch (arg_id)
{
case ARG_LABEL:
GTK_VALUE_STRING (*arg) = g_strdup (label->label);
break;
case ARG_PATTERN:
GTK_VALUE_STRING (*arg) = g_strdup (label->pattern);
break;
case ARG_JUSTIFY:
GTK_VALUE_ENUM (*arg) = label->jtype;
break;
case ARG_WRAP:
GTK_VALUE_BOOL (*arg) = label->wrap;
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->pattern = NULL;
label->jtype = GTK_JUSTIFY_CENTER;
label->wrap = FALSE;
label->layout = NULL;
gtk_label_set_text (label, "");
}
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);
}
static inline void
gtk_label_set_text_internal (GtkLabel *label,
gchar *str)
{
g_free (label->label);
label->label = str;
if (label->layout)
pango_layout_set_text (label->layout, str, -1);
gtk_widget_queue_resize (GTK_WIDGET (label));
}
void
gtk_label_set_text (GtkLabel *label,
const gchar *str)
{
g_return_if_fail (GTK_IS_LABEL (label));
gtk_label_set_text_internal (label, g_strdup (str ? str : ""));
}
/**
* gtk_label_get_text:
* @label: a #GtkLabel
*
* Fetches the text from a label widget
*
* Return value: the text in the label widget. This value must
* be freed with g_free().
**/
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 g_strdup (label->label);
}
void
gtk_label_set_pattern (GtkLabel *label,
const gchar *pattern)
{
g_return_if_fail (GTK_IS_LABEL (label));
g_free (label->pattern);
label->pattern = g_strdup (pattern);
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;
if (label->layout)
{
/* No real need to be this drastic, but easier than duplicating the code */
g_object_unref (G_OBJECT (label->layout));
label->layout = NULL;
}
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;
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->label;
}
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->pattern);
if (label->layout)
g_object_unref (G_OBJECT (label->layout));
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static PangoAttrList *
gtk_label_pattern_to_attrs (GtkLabel *label)
{
PangoAttrList *attrs = pango_attr_list_new ();
if (label->pattern)
{
const char *start;
const char *p = label->label;
const char *q = label->pattern;
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->label;
attr->end_index = p - label->label;
pango_attr_list_insert (attrs, attr);
}
else
break;
}
}
return attrs;
}
static void
gtk_label_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkLabel *label;
PangoRectangle logical_rect;
g_return_if_fail (GTK_IS_LABEL (widget));
g_return_if_fail (requisition != NULL);
label = GTK_LABEL (widget);
/*
* 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.
*/
requisition->width = label->misc.xpad;
requisition->height = label->misc.ypad;
if (!label->layout)
{
PangoAlignment align = PANGO_ALIGN_LEFT; /* Quiet gcc */
PangoAttrList *attrs = gtk_label_pattern_to_attrs (label);
label->layout = gtk_widget_create_pango_layout (widget, label->label);
pango_layout_set_attributes (label->layout, attrs);
pango_attr_list_unref (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_object_get_data (GTK_OBJECT (widget), "gtk-aux-info");
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);
requisition->width += aux_info->width;
requisition->height += 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);
requisition->width += PANGO_PIXELS (real_width);
requisition->height += PANGO_PIXELS (height);
}
}
else /* !label->wrap */
{
pango_layout_set_width (label->layout, -1);
pango_layout_get_extents (label->layout, NULL, &logical_rect);
requisition->width += PANGO_PIXELS (logical_rect.width);
requisition->height += PANGO_PIXELS (logical_rect.height);
}
}
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);
if (previous_style && label->layout)
pango_layout_context_changed (label->layout);
}
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 gint
gtk_label_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GtkLabel *label;
GtkMisc *misc;
gint x, y;
gfloat xalign;
g_return_val_if_fail (GTK_IS_LABEL (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
label = GTK_LABEL (widget);
if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_MAPPED (widget) &&
label->label && (*label->label != '\0'))
{
misc = GTK_MISC (widget);
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR)
xalign = misc->xalign;
else
xalign = 1. - misc->xalign;
/*
* GC Clipping
*/
gdk_gc_set_clip_rectangle (widget->style->white_gc, &event->area);
gdk_gc_set_clip_rectangle (widget->style->fg_gc[widget->state], &event->area);
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);
gdk_draw_layout (widget->window, widget->style->fg_gc [widget->state], x, y, label->layout);
gdk_gc_set_clip_rectangle (widget->style->white_gc, NULL);
gdk_gc_set_clip_rectangle (widget->style->fg_gc[widget->state], NULL);
}
return TRUE;
}
guint
gtk_label_parse_uline (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_val_if_fail (GTK_IS_LABEL (label), GDK_VoidSymbol);
g_return_val_if_fail (str != NULL, GDK_VoidSymbol);
/* 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;
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 GDK_VoidSymbol;
}
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 (label, pattern);
g_free (pattern);
return accel_key;
}