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authorAlessandro Ghedini <al3xbio@gmail.com>2011-11-20 15:50:38 +0100
committerAlessandro Ghedini <al3xbio@gmail.com>2011-11-20 15:50:38 +0100
commitd6b2677825cbb423e2099563c16321c3e23d7899 (patch)
treefd04dbf76a9bc0fdd3f7755e65d1c175ac5c99dd /src/images/renderedText.vala
parent6451a495637c6e3047a5a56573cffc6e3de9a515 (diff)
Imported Upstream version 0.3.1upstream/0.3.1
Diffstat (limited to 'src/images/renderedText.vala')
-rw-r--r--src/images/renderedText.vala110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/images/renderedText.vala b/src/images/renderedText.vala
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+/*
+Copyright (c) 2011 by Simon Schneegans
+
+This program 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.
+
+This program 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
+this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+namespace GnomePie {
+
+/////////////////////////////////////////////////////////////////////////
+/// A class representing string, rendered on an Image.
+/////////////////////////////////////////////////////////////////////////
+
+public class RenderedText : Image {
+
+ /////////////////////////////////////////////////////////////////////
+ /// A cache which stores images. It is cleared when the theme of
+ /// Gnome-Pie changes.
+ /// The key is in form <string>@<width>x<height>:<font>.
+ /////////////////////////////////////////////////////////////////////
+
+ private static Gee.HashMap<string, Cairo.ImageSurface?> cache { private get; private set; }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Initializes the cache.
+ /////////////////////////////////////////////////////////////////////
+
+ public static void init() {
+ clear_cache();
+
+ Config.global.notify["theme"].connect(() => {
+ clear_cache();
+ });
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Clears the cache.
+ /////////////////////////////////////////////////////////////////////
+
+ static void clear_cache() {
+ cache = new Gee.HashMap<string, Cairo.ImageSurface?>();
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// C'tor, creates a new image representation of a string.
+ /////////////////////////////////////////////////////////////////////
+
+ public RenderedText(string text, int width, int height, string font) {
+ var cached = this.cache.get("%s@%ux%u:%s".printf(text, width, height, font));
+
+ if (cached == null) {
+ this.render_text(text, width, height, font);
+ this.cache.set("%s@%ux%u:%s".printf(text, width, height, font), this.surface);
+ } else {
+ this.surface = cached;
+ }
+ }
+
+ /////////////////////////////////////////////////////////////////////
+ /// Creates a new transparent image, with text written onto.
+ /////////////////////////////////////////////////////////////////////
+
+ public void render_text(string text, int width, int height, string font) {
+ this.surface = new Cairo.ImageSurface(Cairo.Format.ARGB32, width, height);
+
+ var ctx = this.context();
+
+ // set the color as specified in the current theme
+ Color color = Config.global.theme.caption_color;
+ ctx.set_source_rgb(color.r, color.g, color.g);
+
+ var layout = Pango.cairo_create_layout(ctx);
+ layout.set_width(Pango.units_from_double(width));
+
+ var font_description = Pango.FontDescription.from_string(font);
+ font_description.set_size((int)(font_description.get_size() * Config.global.global_scale));
+
+ layout.set_font_description(font_description);
+ layout.set_text(text, -1);
+
+ // add newlines at the end of each line, in order to allow ellipsizing
+ string broken_string = "";
+ foreach (var line in layout.get_lines()) {
+ broken_string = broken_string.concat(text.substring(line.start_index, line.length), "\n");
+ }
+ layout.set_text(broken_string, broken_string.length-1);
+
+ layout.set_ellipsize(Pango.EllipsizeMode.END);
+ layout.set_alignment(Pango.Alignment.CENTER);
+
+ Pango.Rectangle extents;
+ layout.get_pixel_extents(null, out extents);
+ ctx.move_to(0, (int)(0.5*(height - extents.height)));
+
+ Pango.cairo_update_layout(ctx, layout);
+ Pango.cairo_show_layout(ctx, layout);
+ }
+}
+
+}