1 files changed, 98 insertions, 0 deletions
diff --git a/src/CheckerboardItemText.vala b/src/CheckerboardItemText.vala
new file mode 100644
index 0000000..8924938
--- /dev/null
+++ b/src/CheckerboardItemText.vala
@@ -0,0 +1,98 @@
+/* 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;
+        }
+    }
+}
+
+