/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Author :
* Damon Chaplin <damon@helixcode.com>
*
* Copyright 1999, Helix Code, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*
* This is similar to GtkLabel but clips itself and displays '...' if it
* can't fit inside its allocated area. The intended use is for inside buttons
* that are a fixed size. The GtkLabel would normally display only the middle
* part of the text, which doesn't look very good. This only supports one line
* of text (so no wrapping/justification), without underlined characters.
*/
#include <math.h>
#include <gdk/gdki18n.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include "e-clipped-label.h"
static void e_clipped_label_class_init (EClippedLabelClass *class);
static void e_clipped_label_init (EClippedLabel *label);
static void e_clipped_label_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void e_clipped_label_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gint e_clipped_label_expose (GtkWidget *widget,
GdkEventExpose *event);
static void e_clipped_label_recalc_chars_displayed (EClippedLabel *label);
static GtkMiscClass *parent_class;
/* This is the string to draw when the label is clipped, e.g. '...'. */
static gchar *e_clipped_label_ellipsis;
/* Flags used in chars_displayed field. Must be negative. */
#define E_CLIPPED_LABEL_NEED_RECALC -1
#define E_CLIPPED_LABEL_SHOW_ENTIRE_LABEL -2
GtkType
e_clipped_label_get_type (void)
{
static GtkType e_clipped_label_type = 0;
if (!e_clipped_label_type){
GtkTypeInfo e_clipped_label_info = {
"EClippedLabel",
sizeof (EClippedLabel),
sizeof (EClippedLabelClass),
(GtkClassInitFunc) e_clipped_label_class_init,
(GtkObjectInitFunc) e_clipped_label_init,
NULL, /* reserved 1 */
NULL, /* reserved 2 */
(GtkClassInitFunc) NULL
};
parent_class = gtk_type_class (GTK_TYPE_MISC);
e_clipped_label_type = gtk_type_unique (GTK_TYPE_MISC,
&e_clipped_label_info);
}
return e_clipped_label_type;
}
static void
e_clipped_label_class_init (EClippedLabelClass *class)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
object_class = (GtkObjectClass *) class;
widget_class = (GtkWidgetClass *) class;
/* Method override */
widget_class->size_request = e_clipped_label_size_request;
widget_class->size_allocate = e_clipped_label_size_allocate;
widget_class->expose_event = e_clipped_label_expose;
e_clipped_label_ellipsis = _("...");
}
static void
e_clipped_label_init (EClippedLabel *label)
{
GTK_WIDGET_SET_FLAGS (label, GTK_NO_WINDOW);
label->label = NULL;
label->label_wc = NULL;
label->chars_displayed = E_CLIPPED_LABEL_NEED_RECALC;
}
/**
* e_clipped_label_new:
*
* @text: The label text.
* @Returns: A new #EClippedLabel.
*
* Creates a new #EClippedLabel with the given text.
**/
GtkWidget *
e_clipped_label_new (const gchar *text)
{
GtkWidget *label;
label = GTK_WIDGET (gtk_type_new (e_clipped_label_get_type ()));
if (text && *text)
e_clipped_label_set_text (E_CLIPPED_LABEL (label), text);
return label;
}
static void
e_clipped_label_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
EClippedLabel *label;
GdkFont *font;
g_return_if_fail (E_IS_CLIPPED_LABEL (widget));
g_return_if_fail (requisition != NULL);
label = E_CLIPPED_LABEL (widget);
font = widget->style->font;
requisition->width = 0;
requisition->height = font->ascent + font->descent
+ 2 * GTK_MISC (widget)->ypad;
}
static void
e_clipped_label_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
EClippedLabel *label;
label = E_CLIPPED_LABEL (widget);
widget->allocation = *allocation;
/* Flag that we need to recalculate how many characters to display. */
label->chars_displayed = E_CLIPPED_LABEL_NEED_RECALC;
}
static gint
e_clipped_label_expose (GtkWidget *widget,
GdkEventExpose *event)
{
EClippedLabel *label;
GtkMisc *misc;
gint x, y;
GdkFont *font;
gchar *tmp_str, tmp_ch;
g_return_val_if_fail (E_IS_CLIPPED_LABEL (widget), FALSE);
g_return_val_if_fail (event != NULL, FALSE);
label = E_CLIPPED_LABEL (widget);
misc = GTK_MISC (widget);
font = widget->style->font;
/* If the label isn't visible or has no text, just return. */
if (!GTK_WIDGET_VISIBLE (widget) || !GTK_WIDGET_MAPPED (widget)
|| !label->label || (*label->label == '\0'))
return TRUE;
/* Recalculate the number of characters displayed, if necessary. */
if (label->chars_displayed == E_CLIPPED_LABEL_NEED_RECALC)
e_clipped_label_recalc_chars_displayed (label);
/*
* 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);
y = floor (widget->allocation.y + (gint)misc->ypad
+ (((gint)widget->allocation.height - 2 * (gint)misc->ypad
- (gint)font->ascent - font->descent)
* misc->yalign) + 0.5) + font->ascent;
if (label->chars_displayed == E_CLIPPED_LABEL_SHOW_ENTIRE_LABEL) {
x = floor (widget->allocation.x + (gint)misc->xpad
+ (((gint)widget->allocation.width -
(gint)label->label_width - 2 * (gint)misc->xpad)
* misc->xalign) + 0.5);
gtk_paint_string (widget->style, widget->window, widget->state,
&event->area, widget, "label",
x, y, label->label);
} else {
x = widget->allocation.x + (gint)misc->xpad;
tmp_ch = label->label_wc[label->chars_displayed];
label->label_wc[label->chars_displayed] = '\0';
tmp_str = gdk_wcstombs (label->label_wc);
if (tmp_str) {
gtk_paint_string (widget->style, widget->window,
widget->state, &event->area,
widget, "label",
x, y, tmp_str);
g_free (tmp_str);
}
label->label_wc[label->chars_displayed] = tmp_ch;
x = widget->allocation.x + (gint)misc->xpad
+ label->ellipsis_x;
gtk_paint_string (widget->style, widget->window, widget->state,
&event->area, widget, "label",
x, y, e_clipped_label_ellipsis);
}
gdk_gc_set_clip_mask (widget->style->white_gc, NULL);
gdk_gc_set_clip_mask (widget->style->fg_gc[widget->state], NULL);
return TRUE;
}
/**
* e_clipped_label_get_text:
*
* @label: An #EClippedLabel.
* @Return: The label text.
*
* Returns the label text, or NULL.
**/
gchar*
e_clipped_label_get_text (EClippedLabel *label)
{
g_return_val_if_fail (E_IS_CLIPPED_LABEL (label), NULL);
return label->label;
}
/**
* e_clipped_label_set_text:
*
* @label: An #EClippedLabel.
* @text: The new label text.
*
* Sets the label text.
**/
void
e_clipped_label_set_text (EClippedLabel *label,
const gchar *text)
{
gint len;
g_return_if_fail (E_IS_CLIPPED_LABEL (label));
if (label->label != text || !label->label || !text
|| strcmp (label->label, text)) {
g_free (label->label);
g_free (label->label_wc);
label->label = NULL;
label->label_wc = NULL;
if (text) {
label->label = g_strdup (text);
len = strlen (text);
label->label_wc = g_new (GdkWChar, len + 1);
label->wc_len = gdk_mbstowcs (label->label_wc,
label->label, len + 1);
label->label_wc[label->wc_len] = '\0';
}
/* Reset the number of characters displayed, so it is
recalculated when needed. */
label->chars_displayed = E_CLIPPED_LABEL_NEED_RECALC;
/* We don't queue a resize, since the label should not affect
the widget size, but we queue a draw. */
gtk_widget_queue_draw (GTK_WIDGET (label));
}
}
static void
e_clipped_label_recalc_chars_displayed (EClippedLabel *label)
{
GdkFont *font;
gint max_width, width, ch, last_width;
font = GTK_WIDGET (label)->style->font;
max_width = GTK_WIDGET (label)->allocation.width
- 2 * GTK_MISC (label)->xpad;
if (!label->label) {
label->chars_displayed = 0;
return;
}
/* See if the entire label fits in the allocated width. */
label->label_width = gdk_string_width (font, label->label);
if (label->label_width <= max_width) {
label->chars_displayed = E_CLIPPED_LABEL_SHOW_ENTIRE_LABEL;
return;
}
/* Calculate the width of the ellipsis string. */
max_width -= gdk_string_measure (font, e_clipped_label_ellipsis);
if (max_width <= 0) {
label->chars_displayed = 0;
label->ellipsis_x = 0;
return;
}
/* Step through the wide-char label, adding on the widths of the
characters, until we can't fit any more in. */
width = last_width = 0;
for (ch = 0; ch < label->wc_len; ch++) {
width += gdk_char_width_wc (font, label->label_wc[ch]);
if (width > max_width) {
label->chars_displayed = ch;
label->ellipsis_x = last_width;
return;
}
last_width = width;
}
g_warning ("Clipped label width not exceeded as expected");
label->chars_displayed = E_CLIPPED_LABEL_SHOW_ENTIRE_LABEL;
}
