From 5394f202a104a46efdfe2f2914c433d3d8db8407 Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Thu, 13 Mar 2025 22:07:10 +0300
Subject: [PATCH] fix multiline width calculation & feat: multiline tooltips
 support

---
 src/graphics/core/Font.cpp         |  4 ++--
 src/graphics/core/Font.hpp         |  4 ++--
 src/graphics/ui/GUI.cpp            |  2 +-
 src/graphics/ui/elements/Label.cpp | 32 ++++++++++++++++++++++++++++--
 src/graphics/ui/elements/Label.hpp |  3 ++-
 5 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/src/graphics/core/Font.cpp b/src/graphics/core/Font.cpp
index 2116fdd3..74a78932 100644
--- a/src/graphics/core/Font.cpp
+++ b/src/graphics/core/Font.cpp
@@ -38,11 +38,11 @@ bool Font::isPrintableChar(uint codepoint) const {
     }
 }
 
-int Font::calcWidth(const std::wstring& text, size_t length) const {
+int Font::calcWidth(std::wstring_view text, size_t length) const {
     return calcWidth(text, 0, length);
 }
 
-int Font::calcWidth(const std::wstring& text, size_t offset, size_t length) const {
+int Font::calcWidth(std::wstring_view text, size_t offset, size_t length) const {
     return std::min(text.length()-offset, length) * glyphInterval;
 }
 
diff --git a/src/graphics/core/Font.hpp b/src/graphics/core/Font.hpp
index 07fe0532..eabfbcc6 100644
--- a/src/graphics/core/Font.hpp
+++ b/src/graphics/core/Font.hpp
@@ -56,14 +56,14 @@ public:
     /// @param text selected text
     /// @param length max substring length (default: no limit)
     /// @return pixel width of the substring 
-    int calcWidth(const std::wstring& text, size_t length=-1) const;
+    int calcWidth(std::wstring_view text, size_t length=-1) const;
 
     /// @brief Calculate text width in pixels
     /// @param text selected text
     /// @param offset start of the substring
     /// @param length max substring length
     /// @return pixel width of the substring
-    int calcWidth(const std::wstring& text, size_t offset, size_t length) const;
+    int calcWidth(std::wstring_view text, size_t offset, size_t length) const;
 
     /// @brief Check if character is visible (non-whitespace)
     /// @param codepoint character unicode codepoint
diff --git a/src/graphics/ui/GUI.cpp b/src/graphics/ui/GUI.cpp
index 5b028ac4..95425da4 100644
--- a/src/graphics/ui/GUI.cpp
+++ b/src/graphics/ui/GUI.cpp
@@ -41,7 +41,7 @@ GUI::GUI()
 
     tooltip = guiutil::create(
         "<container color='#000000A0' interactive='false' z-index='999'>"
-            "<label id='tooltip.label' pos='2' autoresize='true'></label>"
+            "<label id='tooltip.label' pos='2' autoresize='true' multiline='true' text-wrap='false'></label>"
         "</container>"
     );
     store("tooltip", tooltip);
diff --git a/src/graphics/ui/elements/Label.cpp b/src/graphics/ui/elements/Label.cpp
index 392a9434..9a174c74 100644
--- a/src/graphics/ui/elements/Label.cpp
+++ b/src/graphics/ui/elements/Label.cpp
@@ -35,7 +35,7 @@ uint LabelCache::getLineByTextIndex(size_t index) const {
     return lines.size()-1;
 }
 
-void LabelCache::update(const std::wstring& text, bool multiline, bool wrap) {
+void LabelCache::update(std::wstring_view text, bool multiline, bool wrap) {
     resetFlag = false;
     lines.clear();
     lines.push_back(LineScheme {0, false});
@@ -59,6 +59,27 @@ void LabelCache::update(const std::wstring& text, bool multiline, bool wrap) {
                 }
             }
         }
+        if (font != nullptr) {
+            int lineHeight = font->getLineHeight();
+            int maxWidth = 0;
+            for (int i = 0; i < lines.size() - 1; i++) {
+                const auto& next = lines[i + 1];
+                const auto& cur = lines[i];
+                maxWidth = std::max(
+                    font->calcWidth(
+                        text.substr(cur.offset, next.offset - cur.offset)
+                    ),
+                    maxWidth
+                );
+            }
+            maxWidth = std::max(
+                font->calcWidth(
+                    text.substr(lines[lines.size() - 1].offset)
+                ),
+                maxWidth
+            );
+            multilineWidth = maxWidth;
+        }
     }
 }
 
@@ -89,8 +110,15 @@ glm::vec2 Label::calcSize() {
     if (cache.lines.size() > 1) {
         lineHeight *= lineInterval;
     }
+    auto view = std::wstring_view(text);
+    if (multiline) {
+        return glm::vec2(
+            cache.multilineWidth,
+            lineHeight * cache.lines.size() + font->getYOffset()
+        );
+    }
     return glm::vec2 (
-        cache.font->calcWidth(text), 
+        cache.font->calcWidth(view), 
         lineHeight * cache.lines.size() + font->getYOffset()
     );
 }
diff --git a/src/graphics/ui/elements/Label.hpp b/src/graphics/ui/elements/Label.hpp
index 1fbf5f5e..00d3d0b0 100644
--- a/src/graphics/ui/elements/Label.hpp
+++ b/src/graphics/ui/elements/Label.hpp
@@ -18,9 +18,10 @@ namespace gui {
         /// @brief Reset cache flag
         bool resetFlag = true;
         size_t wrapWidth = -1;
+        int multilineWidth = 0;
     
         void prepare(Font* font, size_t wrapWidth);
-        void update(const std::wstring& text, bool multiline, bool wrap);
+        void update(std::wstring_view text, bool multiline, bool wrap);
 
         size_t getTextLineOffset(size_t line) const;
         uint getLineByTextIndex(size_t index) const;