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-rw-r--r--src/CheckerboardItemText.vala98
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diff --git a/src/CheckerboardItemText.vala b/src/CheckerboardItemText.vala
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+/* Copyright 2016 Software Freedom Conservancy Inc.
+ *
+ * This software is licensed under the GNU LGPL (version 2.1 or later).
+ * See the COPYING file in this distribution.
+ */
+
+private class CheckerboardItemText {
+ private static int one_line_height = 0;
+
+ private string text;
+ private bool marked_up;
+ private Pango.Alignment alignment;
+ private Pango.Layout layout = null;
+ private bool single_line = true;
+ private int height = 0;
+
+ public Gdk.Rectangle allocation = Gdk.Rectangle();
+
+ public CheckerboardItemText(string text, Pango.Alignment alignment = Pango.Alignment.LEFT,
+ bool marked_up = false) {
+ this.text = text;
+ this.marked_up = marked_up;
+ this.alignment = alignment;
+
+ single_line = is_single_line();
+ }
+
+ private bool is_single_line() {
+ return !String.contains_char(text, '\n');
+ }
+
+ public bool is_marked_up() {
+ return marked_up;
+ }
+
+ public bool is_set_to(string text, bool marked_up, Pango.Alignment alignment) {
+ return (this.marked_up == marked_up && this.alignment == alignment && this.text == text);
+ }
+
+ public string get_text() {
+ return text;
+ }
+
+ public int get_height() {
+ if (height == 0)
+ update_height();
+
+ return height;
+ }
+
+ public Pango.Layout get_pango_layout(int max_width = 0) {
+ if (layout == null)
+ create_pango();
+
+ if (max_width > 0)
+ layout.set_width(max_width * Pango.SCALE);
+
+ return layout;
+ }
+
+ public void clear_pango_layout() {
+ layout = null;
+ }
+
+ private void update_height() {
+ if (one_line_height != 0 && single_line)
+ height = one_line_height;
+ else
+ create_pango();
+ }
+
+ private void create_pango() {
+ // create layout for this string and ellipsize so it never extends past its laid-down width
+ layout = AppWindow.get_instance().create_pango_layout(null);
+ if (!marked_up)
+ layout.set_text(text, -1);
+ else
+ layout.set_markup(text, -1);
+
+ layout.set_ellipsize(Pango.EllipsizeMode.END);
+ layout.set_alignment(alignment);
+
+ // getting pixel size is expensive, and we only need the height, so use cached values
+ // whenever possible
+ if (one_line_height != 0 && single_line) {
+ height = one_line_height;
+ } else {
+ int width;
+ layout.get_pixel_size(out width, out height);
+
+ // cache first one-line height discovered
+ if (one_line_height == 0 && single_line)
+ one_line_height = height;
+ }
+ }
+}
+
+