mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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311 lines
9.1 KiB
C
311 lines
9.1 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2022 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkrenderlayoutprivate.h"
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#include "gtkcsscolorvalueprivate.h"
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#include "gtkcssshadowvalueprivate.h"
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#include "gtkpangoprivate.h"
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#include "gtksnapshot.h"
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#include "gtktypebuiltins.h"
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#include "gtksettings.h"
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void
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gtk_css_style_snapshot_layout (GtkCssBoxes *boxes,
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GtkSnapshot *snapshot,
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int x,
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int y,
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PangoLayout *layout)
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{
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GtkCssStyle *style;
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const GdkRGBA *color;
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gboolean has_shadow;
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gtk_snapshot_push_debug (snapshot, "Layout");
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if (x != 0 || y != 0)
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{
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gtk_snapshot_save (snapshot);
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gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
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}
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style = boxes->style;
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color = gtk_css_color_value_get_rgba (style->core->color);
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has_shadow = gtk_css_shadow_value_push_snapshot (style->font->text_shadow, snapshot);
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gtk_snapshot_append_layout (snapshot, layout, color);
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if (has_shadow)
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gtk_snapshot_pop (snapshot);
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if (x != 0 || y != 0)
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gtk_snapshot_restore (snapshot);
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gtk_snapshot_pop (snapshot);
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}
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static void
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draw_insertion_cursor (cairo_t *cr,
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double x,
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double y,
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double width,
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double height,
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double aspect_ratio,
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const GdkRGBA *color,
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PangoDirection direction,
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gboolean draw_arrow)
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{
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int stem_width;
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double angle;
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double dx, dy;
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double xx1, yy1, xx2, yy2;
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cairo_save (cr);
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cairo_new_path (cr);
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gdk_cairo_set_source_rgba (cr, color);
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stem_width = height * aspect_ratio + 1;
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yy1 = y;
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yy2 = y + height;
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if (width < 0)
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{
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xx1 = x;
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xx2 = x - width;
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}
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else
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{
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xx1 = x + width;
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xx2 = x;
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}
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angle = atan2 (height, width);
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dx = (stem_width/2.0) * cos (M_PI/2 - angle);
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dy = (stem_width/2.0) * sin (M_PI/2 - angle);
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if (draw_arrow)
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{
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if (direction == PANGO_DIRECTION_RTL)
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{
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double x0, y0, x1, y1, x2, y2;
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x0 = xx2 - dx + 2 * dy;
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y0 = yy2 - dy - 2 * dx;
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x1 = x0 + 4 * dy;
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y1 = y0 - 4 * dx;
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x2 = x0 + 2 * dy - 3 * dx;
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y2 = y0 - 2 * dx - 3 * dy;
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cairo_move_to (cr, xx1 + dx, yy1 + dy);
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cairo_line_to (cr, xx2 + dx, yy2 + dy);
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cairo_line_to (cr, x2, y2);
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cairo_line_to (cr, x1, y1);
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cairo_line_to (cr, xx1 - dx, yy1 - dy);
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}
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else if (direction == PANGO_DIRECTION_LTR)
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{
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double x0, y0, x1, y1, x2, y2;
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x0 = xx2 + dx + 2 * dy;
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y0 = yy2 + dy - 2 * dx;
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x1 = x0 + 4 * dy;
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y1 = y0 - 4 * dx;
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x2 = x0 + 2 * dy + 3 * dx;
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y2 = y0 - 2 * dx + 3 * dy;
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cairo_move_to (cr, xx1 - dx, yy1 - dy);
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cairo_line_to (cr, xx2 - dx, yy2 - dy);
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cairo_line_to (cr, x2, y2);
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cairo_line_to (cr, x1, y1);
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cairo_line_to (cr, xx1 + dx, yy1 + dy);
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}
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else
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g_assert_not_reached();
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}
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else
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{
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cairo_move_to (cr, xx1 + dx, yy1 + dy);
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cairo_line_to (cr, xx2 + dx, yy2 + dy);
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cairo_line_to (cr, xx2 - dx, yy2 - dy);
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cairo_line_to (cr, xx1 - dx, yy1 - dy);
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}
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cairo_fill (cr);
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cairo_restore (cr);
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}
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static void
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get_insertion_cursor_bounds (double width,
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double height,
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double aspect_ratio,
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PangoDirection direction,
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gboolean draw_arrow,
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graphene_rect_t *bounds)
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{
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int stem_width;
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if (width < 0)
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width = - width;
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stem_width = height * aspect_ratio + 1;
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graphene_rect_init (bounds,
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- 2 * stem_width, - stem_width,
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width + 4 * stem_width, height + 2 * stem_width);
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}
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static void
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snapshot_insertion_cursor (GtkSnapshot *snapshot,
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GtkCssStyle *style,
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double width,
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double height,
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double aspect_ratio,
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gboolean is_primary,
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PangoDirection direction,
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gboolean draw_arrow)
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{
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GdkRGBA color;
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if (is_primary)
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color = *gtk_css_color_value_get_rgba (style->font->caret_color ? style->font->caret_color : style->core->color);
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else
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color = *gtk_css_color_value_get_rgba (style->font->secondary_caret_color ? style->font->secondary_caret_color : style->core->color);
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if (width != 0 || draw_arrow)
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{
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cairo_t *cr;
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graphene_rect_t bounds;
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get_insertion_cursor_bounds (width, height, aspect_ratio, direction, draw_arrow, &bounds);
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cr = gtk_snapshot_append_cairo (snapshot, &bounds);
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draw_insertion_cursor (cr, 0, 0, width, height, aspect_ratio, &color, direction, draw_arrow);
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cairo_destroy (cr);
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}
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else
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{
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int stem_width;
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int offset;
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stem_width = height * aspect_ratio + 1;
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/* put (stem_width % 2) on the proper side of the cursor */
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if (direction == PANGO_DIRECTION_LTR)
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offset = stem_width / 2;
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else
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offset = stem_width - stem_width / 2;
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gtk_snapshot_append_color (snapshot,
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&color,
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&GRAPHENE_RECT_INIT (- offset, 0, stem_width, height));
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}
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}
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void
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gtk_css_style_snapshot_caret (GtkCssBoxes *boxes,
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GdkDisplay *display,
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GtkSnapshot *snapshot,
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int x,
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int y,
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PangoLayout *layout,
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int index,
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PangoDirection direction)
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{
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gboolean split_cursor;
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double aspect_ratio;
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PangoRectangle strong_pos, weak_pos;
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PangoRectangle *cursor1, *cursor2;
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GdkSeat *seat;
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PangoDirection keyboard_direction;
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PangoDirection direction2;
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g_object_get (gtk_settings_get_for_display (display),
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"gtk-split-cursor", &split_cursor,
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"gtk-cursor-aspect-ratio", &aspect_ratio,
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NULL);
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keyboard_direction = PANGO_DIRECTION_LTR;
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seat = gdk_display_get_default_seat (display);
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if (seat)
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{
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GdkDevice *keyboard = gdk_seat_get_keyboard (seat);
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if (keyboard)
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keyboard_direction = gdk_device_get_direction (keyboard);
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}
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pango_layout_get_caret_pos (layout, index, &strong_pos, &weak_pos);
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direction2 = PANGO_DIRECTION_NEUTRAL;
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if (split_cursor)
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{
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cursor1 = &strong_pos;
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if (strong_pos.x != weak_pos.x || strong_pos.y != weak_pos.y)
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{
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direction2 = (direction == PANGO_DIRECTION_LTR) ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
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cursor2 = &weak_pos;
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}
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}
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else
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{
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if (keyboard_direction == direction)
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cursor1 = &strong_pos;
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else
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cursor1 = &weak_pos;
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}
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gtk_snapshot_save (snapshot);
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gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x + PANGO_PIXELS (MIN (cursor1->x, cursor1->x + cursor1->width)), y + PANGO_PIXELS (cursor1->y)));
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snapshot_insertion_cursor (snapshot,
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boxes->style,
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PANGO_PIXELS (cursor1->width),
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PANGO_PIXELS (cursor1->height),
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aspect_ratio,
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TRUE,
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direction,
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direction2 != PANGO_DIRECTION_NEUTRAL);
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gtk_snapshot_restore (snapshot);
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if (direction2 != PANGO_DIRECTION_NEUTRAL)
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{
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gtk_snapshot_save (snapshot);
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gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x + PANGO_PIXELS (MIN (cursor2->x, cursor2->x + cursor2->width)), y + PANGO_PIXELS (cursor2->y)));
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snapshot_insertion_cursor (snapshot,
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boxes->style,
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PANGO_PIXELS (cursor2->width),
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PANGO_PIXELS (cursor2->height),
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aspect_ratio,
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FALSE,
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direction2,
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TRUE);
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gtk_snapshot_restore (snapshot);
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}
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}
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