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gtk2/gtk/gtktextutil.c
Matthias Clasen e7e84bb8ec Remove debug output. 
2006-12-24  Matthias Clasen  <mclasen@redhat.com>

        * gtk/gtktextutil.c: Remove debug output.

        * gtk/gtktextview.c: Improve the DND scrolling
        behaviour.  (#92387, Carlos Garnacho Parro)
2006-12-25 03:57:39 +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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2001. 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 "gtktextutil.h"
#include "gtktextview.h"
#define GTK_TEXT_USE_INTERNAL_UNSUPPORTED_API
#include "gtktextdisplay.h"
#include "gtktextbuffer.h"
#include "gtkmenuitem.h"
#include "gtkintl.h"
#include "gtkalias.h"
#define DRAG_ICON_MAX_WIDTH 250
#define DRAG_ICON_MAX_HEIGHT 250
#define DRAG_ICON_LAYOUT_BORDER 5
#define DRAG_ICON_MAX_LINES 7
#define ELLIPSIS_CHARACTER "\xe2\x80\xa6"
typedef struct _GtkUnicodeMenuEntry GtkUnicodeMenuEntry;
typedef struct _GtkTextUtilCallbackInfo GtkTextUtilCallbackInfo;
struct _GtkUnicodeMenuEntry {
const char *label;
gunichar ch;
};
struct _GtkTextUtilCallbackInfo
{
GtkTextUtilCharChosenFunc func;
gpointer data;
};
static const GtkUnicodeMenuEntry bidi_menu_entries[] = {
{ N_("LRM _Left-to-right mark"), 0x200E },
{ N_("RLM _Right-to-left mark"), 0x200F },
{ N_("LRE Left-to-right _embedding"), 0x202A },
{ N_("RLE Right-to-left e_mbedding"), 0x202B },
{ N_("LRO Left-to-right _override"), 0x202D },
{ N_("RLO Right-to-left o_verride"), 0x202E },
{ N_("PDF _Pop directional formatting"), 0x202C },
{ N_("ZWS _Zero width space"), 0x200B },
{ N_("ZWJ Zero width _joiner"), 0x200D },
{ N_("ZWNJ Zero width _non-joiner"), 0x200C }
};
static void
activate_cb (GtkWidget *menu_item,
gpointer data)
{
GtkUnicodeMenuEntry *entry;
GtkTextUtilCallbackInfo *info = data;
char buf[7];
entry = g_object_get_data (G_OBJECT (menu_item), "gtk-unicode-menu-entry");
buf[g_unichar_to_utf8 (entry->ch, buf)] = '\0';
(* info->func) (buf, info->data);
}
/**
* _gtk_text_util_append_special_char_menuitems
* @menushell: a #GtkMenuShell
* @callback: call this when an item is chosen
* @data: data for callback
*
* Add menuitems for various bidi control characters to a menu;
* the menuitems, when selected, will call the given function
* with the chosen character.
*
* This function is private/internal in GTK 2.0, the functionality may
* become public sometime, but it probably needs more thought first.
* e.g. maybe there should be a way to just get the list of items,
* instead of requiring the menu items to be created.
**/
void
_gtk_text_util_append_special_char_menuitems (GtkMenuShell *menushell,
GtkTextUtilCharChosenFunc func,
gpointer data)
{
int i;
for (i = 0; i < G_N_ELEMENTS (bidi_menu_entries); i++)
{
GtkWidget *menuitem;
GtkTextUtilCallbackInfo *info;
/* wasteful to have a bunch of copies, but simplifies mem management */
info = g_new (GtkTextUtilCallbackInfo, 1);
info->func = func;
info->data = data;
menuitem = gtk_menu_item_new_with_mnemonic (_(bidi_menu_entries[i].label));
g_object_set_data (G_OBJECT (menuitem), I_("gtk-unicode-menu-entry"),
(gpointer)&bidi_menu_entries[i]);
g_signal_connect_data (menuitem, "activate",
G_CALLBACK (activate_cb),
info, (GClosureNotify) g_free, 0);
gtk_widget_show (menuitem);
gtk_menu_shell_append (menushell, menuitem);
}
}
static void
append_n_lines (GString *str, const gchar *text, GSList *lines, gint n_lines)
{
PangoLayoutLine *line;
gint i;
for (i = 0; i < n_lines; i++)
{
line = lines->data;
g_string_append_len (str, &text[line->start_index], line->length);
lines = lines->next;
}
}
static void
limit_layout_lines (PangoLayout *layout)
{
const gchar *text;
GString *str;
GSList *lines, *elem;
gint n_lines;
n_lines = pango_layout_get_line_count (layout);
if (n_lines >= DRAG_ICON_MAX_LINES)
{
text = pango_layout_get_text (layout);
str = g_string_new (NULL);
lines = pango_layout_get_lines_readonly (layout);
/* get first lines */
elem = lines;
append_n_lines (str, text, elem,
DRAG_ICON_MAX_LINES / 2);
g_string_append (str, "\n" ELLIPSIS_CHARACTER "\n");
/* get last lines */
elem = g_slist_nth (lines, n_lines - DRAG_ICON_MAX_LINES / 2);
append_n_lines (str, text, elem,
DRAG_ICON_MAX_LINES / 2);
pango_layout_set_text (layout, str->str, -1);
g_string_free (str, TRUE);
}
}
/**
* _gtk_text_util_create_drag_icon
* @widget: #GtkWidget to extract the pango context
* @text: a #gchar to render the icon
* @len: length of @text, or -1 for NUL-terminated text
*
* Creates a drag and drop icon from @text.
**/
GdkPixmap *
_gtk_text_util_create_drag_icon (GtkWidget *widget,
gchar *text,
gsize len)
{
GdkDrawable *drawable = NULL;
PangoContext *context;
PangoLayout *layout;
gint pixmap_height, pixmap_width;
gint layout_width, layout_height;
g_return_val_if_fail (widget != NULL, NULL);
g_return_val_if_fail (text != NULL, NULL);
context = gtk_widget_get_pango_context (widget);
layout = pango_layout_new (context);
pango_layout_set_text (layout, text, len);
pango_layout_set_wrap (layout, PANGO_WRAP_WORD_CHAR);
pango_layout_get_size (layout, &layout_width, &layout_height);
layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH * PANGO_SCALE);
pango_layout_set_width (layout, layout_width);
limit_layout_lines (layout);
/* get again layout extents, they may have changed */
pango_layout_get_size (layout, &layout_width, &layout_height);
pixmap_width = layout_width / PANGO_SCALE + DRAG_ICON_LAYOUT_BORDER * 2;
pixmap_height = layout_height / PANGO_SCALE + DRAG_ICON_LAYOUT_BORDER * 2;
drawable = gdk_pixmap_new (widget->window,
pixmap_width + 2,
pixmap_height + 2,
-1);
gdk_draw_rectangle (drawable,
widget->style->base_gc [GTK_WIDGET_STATE (widget)],
TRUE,
0, 0,
pixmap_width + 1,
pixmap_height + 1);
gdk_draw_layout (drawable,
widget->style->text_gc [GTK_WIDGET_STATE (widget)],
1 + DRAG_ICON_LAYOUT_BORDER,
1 + DRAG_ICON_LAYOUT_BORDER,
layout);
gdk_draw_rectangle (drawable,
widget->style->black_gc,
FALSE,
0, 0,
pixmap_width + 1,
pixmap_height + 1);
g_object_unref (layout);
return drawable;
}
static void
gtk_text_view_set_attributes_from_style (GtkTextView *text_view,
GtkTextAttributes *values,
GtkStyle *style)
{
values->appearance.bg_color = style->base[GTK_STATE_NORMAL];
values->appearance.fg_color = style->text[GTK_STATE_NORMAL];
if (values->font)
pango_font_description_free (values->font);
values->font = pango_font_description_copy (style->font_desc);
}
GdkPixmap *
_gtk_text_util_create_rich_drag_icon (GtkWidget *widget,
GtkTextBuffer *buffer,
GtkTextIter *start,
GtkTextIter *end)
{
GdkDrawable *drawable = NULL;
gint pixmap_height, pixmap_width;
gint layout_width, layout_height;
GtkTextBuffer *new_buffer;
GtkTextLayout *layout;
GtkTextAttributes *style;
PangoContext *ltr_context, *rtl_context;
GtkTextIter iter;
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
g_return_val_if_fail (start != NULL, NULL);
g_return_val_if_fail (end != NULL, NULL);
new_buffer = gtk_text_buffer_new (gtk_text_buffer_get_tag_table (buffer));
gtk_text_buffer_get_start_iter (new_buffer, &iter);
gtk_text_buffer_insert_range (new_buffer, &iter, start, end);
gtk_text_buffer_get_start_iter (new_buffer, &iter);
layout = gtk_text_layout_new ();
ltr_context = gtk_widget_create_pango_context (widget);
pango_context_set_base_dir (ltr_context, PANGO_DIRECTION_LTR);
rtl_context = gtk_widget_create_pango_context (widget);
pango_context_set_base_dir (rtl_context, PANGO_DIRECTION_RTL);
gtk_text_layout_set_contexts (layout, ltr_context, rtl_context);
g_object_unref (ltr_context);
g_object_unref (rtl_context);
style = gtk_text_attributes_new ();
layout_width = widget->allocation.width;
if (GTK_IS_TEXT_VIEW (widget))
{
gtk_widget_ensure_style (widget);
gtk_text_view_set_attributes_from_style (GTK_TEXT_VIEW (widget),
style, widget->style);
layout_width = layout_width
- gtk_text_view_get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_LEFT)
- gtk_text_view_get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_RIGHT);
}
style->direction = gtk_widget_get_direction (widget);
style->wrap_mode = PANGO_WRAP_WORD_CHAR;
gtk_text_layout_set_default_style (layout, style);
gtk_text_attributes_unref (style);
gtk_text_layout_set_buffer (layout, new_buffer);
gtk_text_layout_set_cursor_visible (layout, FALSE);
gtk_text_layout_set_screen_width (layout, layout_width);
gtk_text_layout_validate (layout, DRAG_ICON_MAX_HEIGHT);
gtk_text_layout_get_size (layout, &layout_width, &layout_height);
layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH);
layout_height = MIN (layout_height, DRAG_ICON_MAX_HEIGHT);
pixmap_width = layout_width + DRAG_ICON_LAYOUT_BORDER * 2;
pixmap_height = layout_height + DRAG_ICON_LAYOUT_BORDER * 2;
drawable = gdk_pixmap_new (widget->window,
pixmap_width + 2, pixmap_height + 2, -1);
gdk_draw_rectangle (drawable,
widget->style->base_gc [GTK_WIDGET_STATE (widget)],
TRUE,
0, 0,
pixmap_width + 1,
pixmap_height + 1);
gtk_text_layout_draw (layout, widget, drawable,
widget->style->text_gc [GTK_WIDGET_STATE (widget)],
- (1 + DRAG_ICON_LAYOUT_BORDER),
- (1 + DRAG_ICON_LAYOUT_BORDER),
0, 0,
pixmap_width, pixmap_height, NULL);
gdk_draw_rectangle (drawable,
widget->style->black_gc,
FALSE,
0, 0,
pixmap_width + 1,
pixmap_height + 1);
g_object_unref (layout);
g_object_unref (new_buffer);
return drawable;
}
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