From 92a395c2933d220c1973777663e6fa9233535382 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Thu, 25 Feb 2021 21:25:25 +0300
Subject: [PATCH] Support overflow modes in label

---
 libs/ui/source/label.cpp | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/libs/ui/source/label.cpp b/libs/ui/source/label.cpp
index 9f0763ce..064e0bdc 100644
--- a/libs/ui/source/label.cpp
+++ b/libs/ui/source/label.cpp
@@ -84,12 +84,48 @@ namespace psemek::ui
 		opts.scale = st->text_scale;
 		cached_state_->glyphs = st->font->shape(text_, opts);
 
+		int lines = 1;
+
+		switch (overflow_)
+		{
+		case overflow_mode::ignore:
+			break;
+		case overflow_mode::drop:
+			{
+				geom::interval<float> x;
+				std::size_t end = 0;
+				for (; end < cached_state_->glyphs.size(); ++end)
+				{
+					x |= cached_state_->glyphs[end].position[0];
+					if (x.length() > shape_.box[0].length())
+						break;
+				}
+				cached_state_->glyphs.resize(end);
+			}
+			break;
+		case overflow_mode::ellipsis:
+			{
+				geom::interval<float> x;
+				std::size_t end = 0;
+				for (; end < cached_state_->glyphs.size(); ++end)
+				{
+					x |= cached_state_->glyphs[end].position[0];
+					if (x.length() > shape_.box[0].length())
+						break;
+				}
+
+				std::string text = text_.substr(0, end);
+				for (std::size_t i = std::max<std::size_t>(3, end) - 3; i < end; ++i)
+					text[i] = '.';
+				cached_state_->glyphs = st->font->shape(text, opts);
+			}
+			break;
+		}
+
 		geom::box<float, 2> bbox;
 		for (auto const & g : cached_state_->glyphs)
 			bbox |= g.position;
 
-		int lines = 1;
-
 		geom::vector<float, 2> offset;
 
 		switch (halign_)