From aba18ef836d5423fd075653144909607e4ec55e7 Mon Sep 17 00:00:00 2001
From: MihailRis <mexaruc@gmail.com>
Date: Sat, 15 Nov 2025 14:28:20 +0300
Subject: [PATCH] add 'keep-line-selection' textbox attribute

---
 src/graphics/ui/elements/TextBox.cpp | 84 ++++++++++++++++------------
 src/graphics/ui/elements/TextBox.hpp |  4 ++
 src/graphics/ui/gui_xml.cpp          |  5 ++
 3 files changed, 56 insertions(+), 37 deletions(-)

diff --git a/src/graphics/ui/elements/TextBox.cpp b/src/graphics/ui/elements/TextBox.cpp
index 52c33bf1..10127f10 100644
--- a/src/graphics/ui/elements/TextBox.cpp
+++ b/src/graphics/ui/elements/TextBox.cpp
@@ -231,7 +231,7 @@ TextBox::~TextBox() = default;
 void TextBox::draw(const DrawContext& pctx, const Assets& assets) {
     Container::draw(pctx, assets);
 
-    if (!isFocused()) {
+    if (!isFocused() && !keepLineSelection) {
         return;
     }
     const auto& labelText = getText();
@@ -252,7 +252,7 @@ void TextBox::draw(const DrawContext& pctx, const Assets& assets) {
 
     float time = gui.getWindow().time();
 
-    if (editable && static_cast<int>((time - caretLastMove) * 2) % 2 == 0) {
+    if (isFocused() && editable && static_cast<int>((time - caretLastMove) * 2) % 2 == 0) {
         uint line = label->getLineByTextIndex(caret);
         uint lcaret = caret - label->getTextLineOffset(line);
         int width = rawTextCache.metrics.calcWidth(input, 0, lcaret);
@@ -308,42 +308,44 @@ void TextBox::draw(const DrawContext& pctx, const Assets& assets) {
         }
     }
 
-    if (isFocused() && multiline) {
-        auto selectionCtx = subctx.sub(batch);
-        selectionCtx.setBlendMode(BlendMode::addition);
-
-        batch->setColor(glm::vec4(1, 1, 1, 0.1f));
-
-        uint line = label->getLineByTextIndex(caret);
-        while (label->isFakeLine(line)) {
-            line--;
-        }
-        do {
-            int lineY = label->getLineYOffset(line);
-
-            batch->setColor(glm::vec4(1, 1, 1, 0.05f));
-            if (showLineNumbers) {
-                batch->rect(
-                    lcoord.x - 8,
-                    lcoord.y + lineY,
-                    label->getSize().x,
-                    lineHeight
-                );
-                batch->setColor(glm::vec4(1, 1, 1, 0.10f));
-                batch->rect(
-                    lcoord.x - LINE_NUMBERS_PANE_WIDTH,
-                    lcoord.y + lineY,
-                    LINE_NUMBERS_PANE_WIDTH - 8,
-                    lineHeight
-                );
-            } else {
-                batch->rect(
-                    lcoord.x, lcoord.y + lineY, label->getSize().x, lineHeight
-                );
-            }
-            line++;
-        } while (line < label->getLinesNumber() && label->isFakeLine(line));
+    if (!multiline) {
+        return;
     }
+
+    auto selectionCtx = subctx.sub(batch);
+    selectionCtx.setBlendMode(BlendMode::addition);
+
+    batch->setColor(glm::vec4(1, 1, 1, 0.1f));
+
+    uint line = label->getLineByTextIndex(caret);
+    while (label->isFakeLine(line)) {
+        line--;
+    }
+    do {
+        int lineY = label->getLineYOffset(line);
+
+        batch->setColor(glm::vec4(1, 1, 1, 0.05f));
+        if (showLineNumbers) {
+            batch->rect(
+                lcoord.x - 8,
+                lcoord.y + lineY,
+                label->getSize().x,
+                lineHeight
+            );
+            batch->setColor(glm::vec4(1, 1, 1, 0.10f));
+            batch->rect(
+                lcoord.x - LINE_NUMBERS_PANE_WIDTH,
+                lcoord.y + lineY,
+                LINE_NUMBERS_PANE_WIDTH - 8,
+                lineHeight
+            );
+        } else {
+            batch->rect(
+                lcoord.x, lcoord.y + lineY, label->getSize().x, lineHeight
+            );
+        }
+        line++;
+    } while (line < label->getLinesNumber() && label->isFakeLine(line));
 }
 
 void TextBox::drawBackground(const DrawContext& pctx, const Assets& assets) {
@@ -605,6 +607,14 @@ size_t TextBox::getSelectionEnd() const {
     return selectionEnd;
 }
 
+void TextBox::setKeepLineSelection(bool flag) {
+    keepLineSelection = flag;
+}
+
+bool TextBox::isKeepLineSelection() const {
+    return keepLineSelection;
+}
+
 void TextBox::setOnEditStart(runnable oneditstart) {
     onEditStart = oneditstart;
 }
diff --git a/src/graphics/ui/elements/TextBox.hpp b/src/graphics/ui/elements/TextBox.hpp
index 682e300c..2f9080a5 100644
--- a/src/graphics/ui/elements/TextBox.hpp
+++ b/src/graphics/ui/elements/TextBox.hpp
@@ -62,6 +62,7 @@ namespace gui {
         bool editable = true;
         bool autoresize = false;
         bool showLineNumbers = false;
+        bool keepLineSelection = false;
         std::string markup;
         std::string syntax;
 
@@ -222,6 +223,9 @@ namespace gui {
         size_t getSelectionStart() const;
         size_t getSelectionEnd() const;
 
+        void setKeepLineSelection(bool flag);
+        bool isKeepLineSelection() const;
+
         /// @brief Set runnable called on textbox focus
         virtual void setOnEditStart(runnable oneditstart);
 
diff --git a/src/graphics/ui/gui_xml.cpp b/src/graphics/ui/gui_xml.cpp
index 6dee06eb..3e8bcf5d 100644
--- a/src/graphics/ui/gui_xml.cpp
+++ b/src/graphics/ui/gui_xml.cpp
@@ -573,6 +573,11 @@ static std::shared_ptr<UINode> read_text_box(
     if (element.has("line-numbers")) {
         textbox->setShowLineNumbers(element.attr("line-numbers").asBool());
     }
+    if (element.has("keep-line-selection")) {
+        textbox->setKeepLineSelection(
+            element.attr("keep-line-selection").asBool()
+        );
+    }
     if (element.has("markup")) {
         textbox->setMarkup(element.attr("markup").getText());
     }