add 'keep-line-selection' textbox attribute

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);
@@ -308,7 +308,10 @@ void TextBox::draw(const DrawContext& pctx, const Assets& assets) {
         }
     }
 
-    if (isFocused() && multiline) {
+    if (!multiline) {
+        return;
+    }
+
     auto selectionCtx = subctx.sub(batch);
     selectionCtx.setBlendMode(BlendMode::addition);
 
@@ -344,7 +347,6 @@ void TextBox::draw(const DrawContext& pctx, const Assets& assets) {
         line++;
     } while (line < label->getLinesNumber() && label->isFakeLine(line));
 }
-}
 
 void TextBox::drawBackground(const DrawContext& pctx, const Assets& assets) {
     auto font = assets.get<Font>(label->getFontName());
@@ -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;
 }

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);
 

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());
     }