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Double-wide and double-high line support.
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Timothy Johnson
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Sep 5, 2016
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| /* | ||
| * Copyright © 2013–2014 Philipp Emanuel Weidmann <[email protected]> | ||
| * Copyright © 2015-2016 RedHatter <[email protected]> | ||
| * | ||
| * Nemo vir est qui mundum non reddat meliorem. | ||
| * | ||
| * | ||
| * This file is part of Final Term. | ||
| * | ||
| * Final Term 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 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * Final Term 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 Final Term. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| using Gtk; | ||
| using Pango; | ||
|
|
||
| /** | ||
| * Custom TextView to draw double-wide and double-high text. | ||
| */ | ||
| public class TextView : Gtk.TextView { | ||
| public TextView.with_buffer (TextBuffer buffer) { | ||
| set_buffer(buffer); | ||
| editable = false; | ||
| cursor_visible = false; | ||
| wrap_mode = Gtk.WrapMode.CHAR; | ||
| } | ||
|
|
||
| public override void draw_layer (TextViewLayer layer, Cairo.Context cr) { | ||
| // Draw after text has been rendered | ||
| if (layer != TextViewLayer.BELOW) | ||
| return; | ||
|
|
||
| //TODO: Cache layout | ||
| var line = create_pango_layout(null); | ||
| TextIter iter; | ||
|
|
||
| // For each of the three types obtain the text using | ||
| // forward_to_tag_toggle, apply line styles, set clip, and draw with | ||
| // Cairo transforms | ||
|
|
||
| // Double-wide: scale x by a factor of 2 | ||
| buffer.get_iter_at_line(out iter, 0); | ||
| var tag = buffer.tag_table.lookup("double-wide"); | ||
| if (tag != null) { | ||
| while (next_segment(cr, tag, ref iter, line)) { | ||
| cr.scale(2.0, 1.0); | ||
| Pango.cairo_show_layout(cr, line); | ||
| cr.scale(0.5, 1.0); | ||
| } | ||
| } | ||
|
|
||
| // Double-high top half: scale both x and y by a factor of 2 | ||
| buffer.get_iter_at_line(out iter, 0); | ||
| tag = buffer.tag_table.lookup("double-top"); | ||
| if (tag != null) { | ||
| while (next_segment(cr, tag, ref iter, line)) { | ||
| cr.scale(2.0, 2.0); | ||
| Pango.cairo_show_layout(cr, line); | ||
| cr.scale(0.5, 0.5); | ||
| } | ||
| } | ||
|
|
||
| // Double-high bottom half: scale both x and y by a factor of 2 and | ||
| // shift y up one line | ||
| buffer.get_iter_at_line(out iter, 0); | ||
| tag = buffer.tag_table.lookup("double-bottom"); | ||
| if (tag != null) { | ||
| while (next_segment(cr, tag, ref iter, line)) { | ||
| int line_height; | ||
| get_line_yrange (iter, null, out line_height); | ||
| cr.rel_move_to(0, -line_height); | ||
| cr.scale(2.0, 2.0); | ||
| Pango.cairo_show_layout(cr, line); | ||
| cr.scale(0.5, 0.5); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private bool next_segment (Cairo.Context cr, TextTag tag, ref TextIter iter, Pango.Layout line) { | ||
| if (!iter.forward_to_tag_toggle(tag)) | ||
| return false; // No more segments | ||
|
|
||
| var start = iter; | ||
| iter.forward_to_tag_toggle(tag); | ||
|
|
||
| // Extract text | ||
| var text = buffer.get_text(start, iter, true); | ||
| line.set_text(text, -1); | ||
|
|
||
| // TODO: Set all attribues from tags | ||
|
|
||
| // Set color attribute | ||
| var color = get_default_attributes().appearance.fg_color; | ||
| var attr = Pango.attr_foreground_new(color.red, color.green, color.blue); | ||
| attr.start_index = 0; | ||
| attr.end_index = text.length; | ||
| var attr_list = new AttrList(); | ||
| attr_list.change((owned) attr); | ||
| line.set_attributes(attr_list); | ||
|
|
||
| // Get position shifted by scroll | ||
| Gdk.Rectangle pos_rect; | ||
| get_cursor_locations(iter, out pos_rect, null); | ||
| pos_rect.y -= (int) get_vadjustment().value; | ||
| pos_rect.x -= (int) get_hadjustment().value; | ||
|
|
||
| // clip and move Cairo | ||
| int height; | ||
| line.get_pixel_size(null, out height); | ||
| cr.reset_clip(); | ||
| cr.rectangle(pos_rect.x, pos_rect.y, get_allocated_width(), height); | ||
| cr.clip(); | ||
| cr.move_to(pos_rect.x, pos_rect.y); | ||
|
|
||
| return true; | ||
| } | ||
| } |