gtk2/gtk/gtktextdisplay.c
Havoc Pennington a291b0be4c add new marshallers used by the text widget
2000-10-26  Havoc Pennington  <hp@redhat.com>

	* gtk/gtkmarshal.list: add new marshallers used by the text widget

	* gtk/gtktextbuffer.c (gtk_text_buffer_class_init): fix marshaller
	types

	* gtk/gtktexttagtable.c (gtk_text_tag_table_class_init): fix
	marshaller types

	* gtk/gtktextlayout.h, gtk/gtktextlayout.c, gtk/gtktextdisplay.h,
	gtk/gtktextdisplay.c: We need to preserve Tk copyrights and
	license on these files.

	* gtk/gtktextiter.c (gtk_text_iter_backward_search): Make this
	work.

	* gtk/gtktextbtree.c (gtk_text_btree_new): init stamps to
	runtime random number different for each tree, instead of
	a constant I made up.
2000-10-26 23:05:43 +00:00

706 lines
22 KiB
C

/* gtktextdisplay.c - display layed-out text
*
* Copyright (c) 1992-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 2000 Red Hat, Inc.
* Tk->Gtk port by Havoc Pennington
*
* This file can be used under your choice of two licenses, the LGPL
* and the original Tk license.
*
* LGPL:
*
* 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.
*
* Original Tk license:
*
* This software is copyrighted by the Regents of the University of
* California, Sun Microsystems, Inc., and other parties. The
* following terms apply to all files associated with the software
* unless explicitly disclaimed in individual files.
*
* The authors hereby grant permission to use, copy, modify,
* distribute, and license this software and its documentation for any
* purpose, provided that existing copyright notices are retained in
* all copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses. Modifications to this
* software may be copyrighted by their authors and need not follow
* the licensing terms described here, provided that the new terms are
* clearly indicated on the first page of each file where they apply.
*
* IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
* DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION,
* OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
* NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
* AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
* MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* GOVERNMENT USE: If you are acquiring this software on behalf of the
* U.S. government, the Government shall have only "Restricted Rights"
* in the software and related documentation as defined in the Federal
* Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you
* are acquiring the software on behalf of the Department of Defense,
* the software shall be classified as "Commercial Computer Software"
* and the Government shall have only "Restricted Rights" as defined
* in Clause 252.227-7013 (c) (1) of DFARs. Notwithstanding the
* foregoing, the authors grant the U.S. Government and others acting
* in its behalf permission to use and distribute the software in
* accordance with the terms specified in this license.
*
*/
/*
* 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 "gtktextdisplay.h"
#include "gtktextiterprivate.h"
#include <pango/pango.h>
typedef struct _GtkTextRenderState GtkTextRenderState;
struct _GtkTextRenderState
{
GtkWidget *widget;
GtkTextAppearance *last_appearance;
GdkGC *fg_gc;
GdkGC *bg_gc;
GdkRectangle clip_rect;
};
static void get_item_properties (PangoItem *item,
GtkTextAppearance **appearance);
static GdkRegion *get_selected_clip (GtkTextRenderState *render_state,
PangoLayout *layout,
PangoLayoutLine *line,
int x,
int y,
int height,
int start_index,
int end_index);
static GtkTextRenderState *
gtk_text_render_state_new (GtkWidget *widget,
GdkDrawable *drawable,
GdkRectangle *clip_rect)
{
GtkTextRenderState *state = g_new0 (GtkTextRenderState, 1);
state->widget = widget;
state->fg_gc = gdk_gc_new (drawable);
state->bg_gc = gdk_gc_new (drawable);
state->clip_rect = *clip_rect;
return state;
}
static void
gtk_text_render_state_destroy (GtkTextRenderState *state)
{
gdk_gc_unref (state->fg_gc);
gdk_gc_unref (state->bg_gc);
g_free (state);
}
static void
gtk_text_render_state_set_color (GtkTextRenderState *state,
GdkGC *gc,
GdkColor *color)
{
gdk_colormap_alloc_color (gtk_widget_get_colormap (state->widget), color, FALSE, TRUE);
gdk_gc_set_foreground (gc, color);
}
static void
gtk_text_render_state_update (GtkTextRenderState *state,
GtkTextAppearance *new_appearance)
{
if (!state->last_appearance ||
!gdk_color_equal (&new_appearance->fg_color, &state->last_appearance->fg_color))
gtk_text_render_state_set_color (state, state->fg_gc, &new_appearance->fg_color);
if (!state->last_appearance ||
new_appearance->fg_stipple != state->last_appearance->fg_stipple)
{
if (new_appearance->fg_stipple)
{
gdk_gc_set_fill(state->fg_gc, GDK_STIPPLED);
gdk_gc_set_stipple(state->fg_gc, new_appearance->fg_stipple);
}
else
{
gdk_gc_set_fill(state->fg_gc, GDK_SOLID);
}
}
if (new_appearance->draw_bg)
{
if (!state->last_appearance ||
!gdk_color_equal (&new_appearance->bg_color, &state->last_appearance->bg_color))
gtk_text_render_state_set_color (state, state->bg_gc, &new_appearance->bg_color);
if (!state->last_appearance ||
new_appearance->bg_stipple != state->last_appearance->bg_stipple)
{
if (new_appearance->bg_stipple)
{
gdk_gc_set_fill(state->bg_gc, GDK_STIPPLED);
gdk_gc_set_stipple(state->bg_gc, new_appearance->bg_stipple);
}
else
{
gdk_gc_set_fill(state->bg_gc, GDK_SOLID);
}
}
}
state->last_appearance = new_appearance;
}
static void
render_layout_line (GdkDrawable *drawable,
GtkTextRenderState *render_state,
PangoLayoutLine *line,
GSList **pixbuf_pointer,
int x,
int y,
gboolean selected)
{
GSList *tmp_list = line->runs;
PangoRectangle overall_rect;
PangoRectangle logical_rect;
PangoRectangle ink_rect;
gint x_off = 0;
pango_layout_line_get_extents (line, NULL, &overall_rect);
while (tmp_list)
{
PangoLayoutRun *run = tmp_list->data;
GtkTextAppearance *appearance;
tmp_list = tmp_list->next;
get_item_properties (run->item, &appearance);
if (appearance) /* A text segment */
{
GdkGC *fg_gc;
if (selected)
{
fg_gc = render_state->widget->style->fg_gc[GTK_STATE_SELECTED];
}
else
{
gtk_text_render_state_update (render_state, appearance);
fg_gc = render_state->fg_gc;
}
if (appearance->underline == PANGO_UNDERLINE_NONE && !appearance->strikethrough)
pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
NULL, &logical_rect);
else
pango_glyph_string_extents (run->glyphs, run->item->analysis.font,
&ink_rect, &logical_rect);
if (appearance->draw_bg && !selected)
gdk_draw_rectangle (drawable, render_state->bg_gc, TRUE,
x + (x_off + logical_rect.x) / PANGO_SCALE,
y + logical_rect.y / PANGO_SCALE,
logical_rect.width / PANGO_SCALE,
logical_rect.height / PANGO_SCALE);
gdk_draw_glyphs (drawable, fg_gc,
run->item->analysis.font,
x + x_off / PANGO_SCALE, y, run->glyphs);
switch (appearance->underline)
{
case PANGO_UNDERLINE_NONE:
break;
case PANGO_UNDERLINE_DOUBLE:
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 4,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 4);
/* Fall through */
case PANGO_UNDERLINE_SINGLE:
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + 2,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + 2);
break;
case PANGO_UNDERLINE_LOW:
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, y + (ink_rect.y + ink_rect.height) / PANGO_SCALE + 2);
break;
}
if (appearance->strikethrough)
{
gint strikethrough_y = y + (0.3 * logical_rect.y) / PANGO_SCALE;
gdk_draw_line (drawable, fg_gc,
x + (x_off + ink_rect.x) / PANGO_SCALE - 1, strikethrough_y,
x + (x_off + ink_rect.x + ink_rect.width) / PANGO_SCALE, strikethrough_y);
}
x_off += logical_rect.width;
}
else /* Pixbuf segment */
{
GtkTextPixbuf *pixbuf = (*pixbuf_pointer)->data;
gint width, height;
GdkRectangle pixbuf_rect, draw_rect;
GdkBitmap *mask = NULL;
*pixbuf_pointer = (*pixbuf_pointer)->next;
width = gdk_pixbuf_get_width (pixbuf->pixbuf);
height = gdk_pixbuf_get_height (pixbuf->pixbuf);
pixbuf_rect.x = x + x_off / PANGO_SCALE;
pixbuf_rect.y = y - height;
pixbuf_rect.width = width;
pixbuf_rect.height = height;
if (gdk_rectangle_intersect (&pixbuf_rect, &render_state->clip_rect,
&draw_rect))
{
if (gdk_pixbuf_get_has_alpha (pixbuf->pixbuf))
{
mask = gdk_pixmap_new (drawable,
gdk_pixbuf_get_width (pixbuf->pixbuf),
gdk_pixbuf_get_height (pixbuf->pixbuf),
1);
gdk_pixbuf_render_threshold_alpha (pixbuf->pixbuf, mask,
0, 0, 0, 0,
gdk_pixbuf_get_width (pixbuf->pixbuf),
gdk_pixbuf_get_height (pixbuf->pixbuf),
128);
}
if (mask)
{
gdk_gc_set_clip_mask (render_state->fg_gc, mask);
gdk_gc_set_clip_origin (render_state->fg_gc,
pixbuf_rect.x, pixbuf_rect.y);
}
gdk_pixbuf_render_to_drawable (pixbuf->pixbuf,
drawable,
render_state->fg_gc,
draw_rect.x - pixbuf_rect.x,
draw_rect.y - pixbuf_rect.y,
draw_rect.x, draw_rect.y,
draw_rect.width,
draw_rect.height,
GDK_RGB_DITHER_NORMAL,
0, 0);
if (mask)
{
gdk_gc_set_clip_rectangle (render_state->fg_gc,
&render_state->clip_rect);
g_object_unref (G_OBJECT (mask));
}
}
x_off += width * PANGO_SCALE;
}
}
}
static void
render_para (GdkDrawable *drawable,
GtkTextRenderState *render_state,
GtkTextLineDisplay *line_display,
int x,
int y,
int selection_start_index,
int selection_end_index)
{
PangoRectangle logical_rect;
GSList *pixbuf_pointer = line_display->pixbufs;
GSList *tmp_list;
PangoAlignment align;
PangoLayout *layout = line_display->layout;
int indent;
int total_width;
int y_offset = 0;
int byte_offset = 0;
gboolean first = TRUE;
indent = pango_layout_get_indent (layout);
total_width = pango_layout_get_width (layout);
align = pango_layout_get_alignment (layout);
if (total_width < 0)
total_width = line_display->total_width * PANGO_SCALE;
tmp_list = pango_layout_get_lines (layout);
while (tmp_list)
{
PangoLayoutLine *line = tmp_list->data;
int x_offset;
int selection_y, selection_height;
pango_layout_line_get_extents (line, NULL, &logical_rect);
x_offset = line_display->left_margin * PANGO_SCALE;
switch (align)
{
case PANGO_ALIGN_RIGHT:
x_offset += total_width - logical_rect.width;
break;
case PANGO_ALIGN_CENTER:
x_offset += (total_width - logical_rect.width) / 2;
break;
default:
break;
}
if (first)
{
if (indent > 0)
{
if (align == PANGO_ALIGN_LEFT)
x_offset += indent;
else
x_offset -= indent;
}
}
else
{
if (indent < 0)
{
if (align == PANGO_ALIGN_LEFT)
x_offset -= indent;
else
x_offset += indent;
}
}
selection_y = y + y_offset / PANGO_SCALE;
selection_height = logical_rect.height / PANGO_SCALE;
if (first)
{
selection_y -= line_display->top_margin;
selection_height += line_display->top_margin;
}
if (!tmp_list->next)
selection_height += line_display->bottom_margin;
first = FALSE;
if (selection_start_index < byte_offset &&
selection_end_index > line->length + byte_offset) /* All selected */
{
gdk_draw_rectangle (drawable,
render_state->widget->style->bg_gc[GTK_STATE_SELECTED],
TRUE,
x + line_display->left_margin, selection_y,
total_width / PANGO_SCALE, selection_height);
render_layout_line (drawable, render_state, line, &pixbuf_pointer,
x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE,
TRUE);
}
else
{
GSList *pixbuf_pointer_tmp = pixbuf_pointer;
render_layout_line (drawable, render_state, line, &pixbuf_pointer,
x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE,
FALSE);
if (selection_start_index < byte_offset + line->length &&
selection_end_index > byte_offset) /* Some selected */
{
GdkRegion *clip_region = get_selected_clip (render_state, layout, line,
x + line_display->x_offset,
selection_y, selection_height,
selection_start_index, selection_end_index);
gdk_gc_set_clip_region (render_state->widget->style->fg_gc [GTK_STATE_SELECTED], clip_region);
gdk_gc_set_clip_region (render_state->widget->style->bg_gc [GTK_STATE_SELECTED], clip_region);
gdk_draw_rectangle (drawable,
render_state->widget->style->bg_gc[GTK_STATE_SELECTED],
TRUE,
x + x_offset / PANGO_SCALE, selection_y,
logical_rect.width / PANGO_SCALE,
selection_height);
render_layout_line (drawable, render_state, line, &pixbuf_pointer_tmp,
x + x_offset / PANGO_SCALE, y + (y_offset - logical_rect.y) / PANGO_SCALE,
TRUE);
gdk_gc_set_clip_region (render_state->widget->style->fg_gc [GTK_STATE_SELECTED], NULL);
gdk_gc_set_clip_region (render_state->widget->style->bg_gc [GTK_STATE_SELECTED], NULL);
gdk_region_destroy (clip_region);
/* Paint in the ends of the line */
if (x_offset > line_display->left_margin * PANGO_SCALE &&
((line_display->direction == GTK_TEXT_DIR_LTR && selection_start_index < byte_offset) ||
(line_display->direction == GTK_TEXT_DIR_RTL && selection_end_index > byte_offset + line->length)))
{
gdk_draw_rectangle (drawable,
render_state->widget->style->bg_gc[GTK_STATE_SELECTED],
TRUE,
x + line_display->left_margin, selection_y,
x + x_offset / PANGO_SCALE - line_display->left_margin,
selection_height);
}
if (x_offset + logical_rect.width < line_display->left_margin * PANGO_SCALE + total_width &&
((line_display->direction == GTK_TEXT_DIR_LTR && selection_end_index > byte_offset + line->length) ||
(line_display->direction == GTK_TEXT_DIR_RTL && selection_start_index < byte_offset)))
{
gdk_draw_rectangle (drawable,
render_state->widget->style->bg_gc[GTK_STATE_SELECTED],
TRUE,
x + (x_offset + logical_rect.width) / PANGO_SCALE,
selection_y,
x + (line_display->left_margin * PANGO_SCALE + total_width - x_offset - logical_rect.width) / PANGO_SCALE,
selection_height);
}
}
}
byte_offset += line->length;
y_offset += logical_rect.height;
tmp_list = tmp_list->next;
}
}
static GdkRegion *
get_selected_clip (GtkTextRenderState *render_state,
PangoLayout *layout,
PangoLayoutLine *line,
int x,
int y,
int height,
int start_index,
int end_index)
{
gint *ranges;
gint n_ranges, i;
GdkRegion *clip_region = gdk_region_new ();
GdkRegion *tmp_region;
PangoRectangle logical_rect;
pango_layout_line_get_extents (line, NULL, &logical_rect);
pango_layout_line_get_x_ranges (line, start_index, end_index, &ranges, &n_ranges);
for (i=0; i < n_ranges; i++)
{
GdkRectangle rect;
rect.x = x + ranges[2*i] / PANGO_SCALE;
rect.y = y;
rect.width = (ranges[2*i + 1] - ranges[2*i]) / PANGO_SCALE;
rect.height = height;
gdk_region_union_with_rect (clip_region, &rect);
}
tmp_region = gdk_region_rectangle (&render_state->clip_rect);
gdk_region_intersect (clip_region, tmp_region);
gdk_region_destroy (tmp_region);
g_free (ranges);
return clip_region;
}
static void
get_item_properties (PangoItem *item,
GtkTextAppearance **appearance)
{
GSList *tmp_list = item->extra_attrs;
*appearance = NULL;
while (tmp_list)
{
PangoAttribute *attr = tmp_list->data;
if (attr->klass->type == gtk_text_attr_appearance_type)
{
*appearance = &((GtkTextAttrAppearance *)attr)->appearance;
}
tmp_list = tmp_list->next;
}
}
void
gtk_text_layout_draw (GtkTextLayout *layout,
GtkWidget *widget,
GdkDrawable *drawable,
/* Location of the layout
in buffer coordinates */
gint x_offset,
gint y_offset,
/* Region of the layout to
render */
gint x,
gint y,
gint width,
gint height)
{
GdkRectangle clip;
gint current_y;
GSList *line_list;
GSList *tmp_list;
GSList *cursor_list;
GtkTextRenderState *render_state;
GtkTextIter selection_start, selection_end;
gboolean have_selection = FALSE;
g_return_if_fail (GTK_IS_TEXT_LAYOUT (layout));
g_return_if_fail (layout->default_style != NULL);
g_return_if_fail (layout->buffer != NULL);
g_return_if_fail (drawable != NULL);
g_return_if_fail (x_offset >= 0);
g_return_if_fail (y_offset >= 0);
g_return_if_fail (width >= 0);
g_return_if_fail (height >= 0);
if (width == 0 || height == 0)
return;
line_list = gtk_text_layout_get_lines (layout, y + y_offset, y + y_offset + height, &current_y);
current_y -= y_offset;
if (line_list == NULL)
return; /* nothing on the screen */
clip.x = x;
clip.y = y;
clip.width = width;
clip.height = height;
render_state = gtk_text_render_state_new (widget, drawable, &clip);
gdk_gc_set_clip_rectangle (render_state->fg_gc, &clip);
gdk_gc_set_clip_rectangle (render_state->bg_gc, &clip);
gtk_text_layout_wrap_loop_start (layout);
if (gtk_text_buffer_get_selection_bounds (layout->buffer,
&selection_start,
&selection_end))
have_selection = TRUE;
tmp_list = line_list;
while (tmp_list != NULL)
{
GtkTextLineDisplay *line_display;
gint selection_start_index = -1;
gint selection_end_index = -1;
GtkTextLine *line = tmp_list->data;
line_display = gtk_text_layout_get_line_display (layout, line, FALSE);
if (have_selection)
{
GtkTextIter line_start, line_end;
gint byte_count = gtk_text_line_byte_count (line);
gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
&line_start,
line, 0);
gtk_text_btree_get_iter_at_line (_gtk_text_buffer_get_btree (layout->buffer),
&line_end,
line, byte_count - 1);
if (gtk_text_iter_compare (&selection_start, &line_end) < 0 &&
gtk_text_iter_compare (&selection_end, &line_start) > 0)
{
if (gtk_text_iter_compare (&selection_start, &line_start) >= 0)
selection_start_index = gtk_text_iter_get_line_index (&selection_start);
else
selection_start_index = -1;
if (gtk_text_iter_compare (&selection_end, &line_end) <= 0)
selection_end_index = gtk_text_iter_get_line_index (&selection_end);
else
selection_end_index = byte_count;
}
}
render_para (drawable, render_state, line_display,
- x_offset,
current_y + line_display->top_margin,
selection_start_index, selection_end_index);
/* We paint the cursors last, because they overlap another chunk
and need to appear on top. */
cursor_list = line_display->cursors;
while (cursor_list)
{
GtkTextCursorDisplay *cursor = cursor_list->data;
GdkGC *gc;
if (cursor->is_strong)
gc = widget->style->bg_gc[GTK_STATE_SELECTED];
else
gc = widget->style->fg_gc[GTK_STATE_NORMAL];
gdk_draw_line (drawable, gc,
line_display->x_offset + cursor->x,
current_y + line_display->top_margin + cursor->y,
line_display->x_offset + cursor->x,
current_y + line_display->top_margin + cursor->y + cursor->height);
cursor_list = cursor_list->next;
}
current_y += line_display->height;
gtk_text_layout_free_line_display (layout, line_display);
tmp_list = g_slist_next (tmp_list);
}
gtk_text_layout_wrap_loop_end (layout);
gtk_text_render_state_destroy (render_state);
g_slist_free (line_list);
}