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Learning_GTK4_tree/gtk/gtktextutil.c

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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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 "gtktextview.h"
#include "gtktextutilprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtktextbuffer.h"
#include "gtktextlayoutprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkrenderbackgroundprivate.h"
#define DRAG_ICON_MAX_WIDTH 250
#define DRAG_ICON_MAX_HEIGHT 250
#define DRAG_ICON_MAX_LINES 7
#define ELLIPSIS_CHARACTER "\xe2\x80\xa6"
static void
append_n_lines (GString *str, const char *text, GSList *lines, int n_lines)
{
PangoLayoutLine *line;
int i;
for (i = 0; i < n_lines; i++)
{
line = lines->data;
g_string_append_len (str,
&text[pango_layout_line_get_start_index (line)],
pango_layout_line_get_length (line));
lines = lines->next;
}
}
static void
limit_layout_lines (PangoLayout *layout)
{
const char *text;
GString *str;
GSList *lines, *elem;
int 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 #char to render the icon
* @len: length of @text, or -1 for NUL-terminated text
*
* Creates a drag and drop icon from @text.
*
* Returns: (transfer full): a `GdkPaintable` to use as DND icon
*/
GdkPaintable *
gtk_text_util_create_drag_icon (GtkWidget *widget,
char *text,
gssize len)
{
GtkCssStyle *style;
GtkSnapshot *snapshot;
PangoContext *context;
PangoLayout *layout;
GdkPaintable *paintable;
int layout_width;
int layout_height;
const GdkRGBA *color;
GdkDisplay *display;
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, NULL);
layout_width = MIN (layout_width, DRAG_ICON_MAX_WIDTH * PANGO_SCALE);
pango_layout_set_width (layout, layout_width);
limit_layout_lines (layout);
snapshot = gtk_snapshot_new ();
style = gtk_css_node_get_style (gtk_widget_get_css_node (widget));
color = gtk_css_color_value_get_rgba (style->core->color);
display = gtk_widget_get_display (widget);
if (!gdk_display_is_rgba (display) ||
!gdk_display_is_composited (display))
{
GtkWidget *bg_widget;
GtkCssBoxes boxes;
if (GTK_IS_TEXT (widget))
bg_widget = gtk_widget_get_parent (widget);
else
bg_widget = widget;
pango_layout_get_size (layout, &layout_width, &layout_height);
style = gtk_css_node_get_style (gtk_widget_get_css_node (bg_widget));
gtk_css_boxes_init_border_box (&boxes, style,
0, 0,
layout_width / PANGO_SCALE,
layout_height / PANGO_SCALE);
gtk_css_style_snapshot_background (&boxes, snapshot);
}
gtk_snapshot_append_layout (snapshot, layout, color);
paintable = gtk_snapshot_free_to_paintable (snapshot, NULL);
g_object_unref (layout);
return paintable;
}
static void
set_attributes_from_style (GtkWidget *widget,
GtkTextAttributes *values)
{
GtkCssStyle *style;
const GdkRGBA black = { 0, };
if (!values->appearance.bg_rgba)
values->appearance.bg_rgba = gdk_rgba_copy (&black);
if (!values->appearance.fg_rgba)
values->appearance.fg_rgba = gdk_rgba_copy (&black);
style = gtk_css_node_get_style (gtk_widget_get_css_node (widget));
*values->appearance.bg_rgba = *gtk_css_color_value_get_rgba (style->background->background_color);
*values->appearance.fg_rgba = *gtk_css_color_value_get_rgba (style->core->color);
if (values->font)
pango_font_description_free (values->font);
values->font = gtk_css_style_get_pango_font (style);
}
static int
get_border_window_size (GtkTextView *text_view,
GtkTextWindowType window_type)
{
GtkWidget *gutter;
gutter = gtk_text_view_get_gutter (text_view, window_type);
if (gutter != NULL)
return gtk_widget_get_width (gutter);
return 0;
}
GdkPaintable *
gtk_text_util_create_rich_drag_icon (GtkWidget *widget,
GtkTextBuffer *buffer,
GtkTextIter *start,
GtkTextIter *end)
{
GdkPaintable *paintable;
GtkSnapshot *snapshot;
int layout_width, layout_height;
GtkTextBuffer *new_buffer;
GtkTextLayout *layout;
GtkTextAttributes *style;
PangoContext *ltr_context, *rtl_context;
GtkTextIter iter;
GdkDisplay *display;
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 = gtk_widget_get_width (widget);
set_attributes_from_style (widget, style);
if (GTK_IS_TEXT_VIEW (widget))
{
layout_width = layout_width
- get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_LEFT)
- get_border_window_size (GTK_TEXT_VIEW (widget), GTK_TEXT_WINDOW_RIGHT);
}
style->direction = gtk_widget_get_direction (widget);
style->wrap_mode = GTK_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);
snapshot = gtk_snapshot_new ();
display = gtk_widget_get_display (widget);
if (!gdk_display_is_rgba (display) ||
!gdk_display_is_composited (display))
{
GtkCssBoxes boxes;
GtkCssStyle *css_style;
css_style = gtk_css_node_get_style (gtk_widget_get_css_node (widget));
gtk_css_boxes_init_border_box (&boxes, css_style,
0, 0, layout_width, layout_height);
gtk_css_style_snapshot_background (&boxes, snapshot);
}
gtk_text_layout_snapshot (layout, widget, snapshot, &(GdkRectangle) { 0, 0, layout_width, layout_height }, 1.0);
g_object_unref (layout);
g_object_unref (new_buffer);
paintable = gtk_snapshot_free_to_paintable (snapshot, &(graphene_size_t) { layout_width, layout_height });
return paintable;
}
static int
layout_get_char_width (PangoLayout *layout)
{
int width;
PangoFontMetrics *metrics;
const PangoFontDescription *font_desc;
PangoContext *context = pango_layout_get_context (layout);
font_desc = pango_layout_get_font_description (layout);
if (!font_desc)
font_desc = pango_context_get_font_description (context);
metrics = pango_context_get_metrics (context, font_desc, NULL);
width = pango_font_metrics_get_approximate_char_width (metrics);
pango_font_metrics_unref (metrics);
return width;
}
/*
* _gtk_text_util_get_block_cursor_location
* @layout: a `PangoLayout`
* @index: index at which cursor is located
* @pos: cursor location
* @at_line_end: whether cursor is drawn at line end, not over some
* character
*
* Returns: whether cursor should actually be drawn as a rectangle.
* It may not be the case if character at index is invisible.
*/
gboolean
_gtk_text_util_get_block_cursor_location (PangoLayout *layout,
int index,
PangoRectangle *pos,
gboolean *at_line_end)
{
PangoRectangle strong_pos, weak_pos;
PangoLayoutLine *layout_line;
gboolean rtl;
int line_no;
const char *text;
g_return_val_if_fail (layout != NULL, FALSE);
g_return_val_if_fail (index >= 0, FALSE);
g_return_val_if_fail (pos != NULL, FALSE);
pango_layout_index_to_pos (layout, index, pos);
if (pos->width != 0)
{
/* cursor is at some visible character, good */
if (at_line_end)
*at_line_end = FALSE;
if (pos->width < 0)
{
pos->x += pos->width;
pos->width = -pos->width;
}
return TRUE;
}
pango_layout_index_to_line_x (layout, index, FALSE, &line_no, NULL);
layout_line = pango_layout_get_line_readonly (layout, line_no);
g_return_val_if_fail (layout_line != NULL, FALSE);
text = pango_layout_get_text (layout);
if (index < pango_layout_line_get_start_index (layout_line) + pango_layout_line_get_length (layout_line))
{
/* this may be a zero-width character in the middle of the line,
* or it could be a character where line is wrapped, we do want
* block cursor in latter case */
if (g_utf8_next_char (text + index) - text !=
pango_layout_line_get_start_index (layout_line) + pango_layout_line_get_length (layout_line))
{
/* zero-width character in the middle of the line, do not
* bother with block cursor */
return FALSE;
}
}
/* Cursor is at the line end. It may be an empty line, or it could
* be on the left or on the right depending on text direction, or it
* even could be in the middle of visual layout in bidi text. */
pango_layout_get_cursor_pos (layout, index, &strong_pos, &weak_pos);
if (strong_pos.x != weak_pos.x)
{
/* do not show block cursor in this case, since the character typed
* in may or may not appear at the cursor position */
return FALSE;
}
/* In case when index points to the end of line, pos->x is always most right
* pixel of the layout line, so we need to correct it for RTL text. */
if (pango_layout_line_get_length (layout_line))
{
if (pango_layout_line_get_resolved_direction (layout_line) == PANGO_DIRECTION_RTL)
{
PangoLayoutIter *iter;
PangoRectangle line_rect;
int i;
int left, right;
const char *p;
p = g_utf8_prev_char (text + index);
pango_layout_line_index_to_x (layout_line, p - text, FALSE, &left);
pango_layout_line_index_to_x (layout_line, p - text, TRUE, &right);
pos->x = MIN (left, right);
iter = pango_layout_get_iter (layout);
for (i = 0; i < line_no; i++)
pango_layout_iter_next_line (iter);
pango_layout_iter_get_line_extents (iter, NULL, &line_rect);
pango_layout_iter_free (iter);
rtl = TRUE;
pos->x += line_rect.x;
}
else
rtl = FALSE;
}
else
{
PangoContext *context = pango_layout_get_context (layout);
rtl = pango_context_get_base_dir (context) == PANGO_DIRECTION_RTL;
}
pos->width = layout_get_char_width (layout);
if (rtl)
pos->x -= pos->width - 1;
if (at_line_end)
*at_line_end = TRUE;
return pos->width != 0;
}
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