add textbox:indexByPos and :lineY methods

src/graphics/ui/elements/Container.hpp

@@ -37,7 +37,9 @@ namespace gui {
         virtual void scrolled(int value) override;
         virtual void setScrollable(bool flag);
         void listenInterval(float interval, OnTimeOut callback, int repeat=-1);
-        virtual glm::vec2 getContentOffset() override {return glm::vec2(0.0f, scroll);};
+        virtual glm::vec2 getContentOffset() const override {
+            return glm::vec2(0.0f, scroll);
+        };
         virtual void setSize(const glm::vec2& size) override;
         virtual int getScrollStep() const;
         virtual void setScrollStep(int step);

src/graphics/ui/elements/TextBox.cpp

@@ -671,6 +671,11 @@ int TextBox::calcIndexAt(int x, int y) const {
     );
 }
 
+int TextBox::getLineYOffset(int line) const {
+    if (rawTextCache.fontId == 0) return 0;
+    return label->getLineYOffset(line) + getContentOffset().y;
+}
+
 static inline std::wstring get_alphabet(wchar_t c) {
     std::wstring alphabet {c};
     if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '_') {

src/graphics/ui/elements/TextBox.hpp

@@ -74,7 +74,6 @@ namespace gui {
 
         size_t normalizeIndex(int index);
 
-        int calcIndexAt(int x, int y) const;
         void setTextOffset(uint x);
         bool eraseSelected();
         void resetSelection();
@@ -186,6 +185,9 @@ namespace gui {
         /// @return line position in text
         virtual size_t getLinePos(uint line) const;
 
+        int calcIndexAt(int x, int y) const;
+        int getLineYOffset(int line) const;
+
         /// @brief Check text with validator set with setTextValidator
         /// @return true if text is valid
         virtual bool validate();

src/graphics/ui/elements/UINode.hpp

@@ -267,7 +267,7 @@ namespace gui {
         virtual glm::vec4 calcColor() const;
 
         /// @brief Get inner content offset. Used for scroll
-        virtual glm::vec2 getContentOffset() {return glm::vec2(0.0f);};
+        virtual glm::vec2 getContentOffset() const {return glm::vec2(0.0f);};
         /// @brief Calculate screen position of the element
         virtual glm::vec2 calcPos() const;
         virtual void setPos(const glm::vec2& pos);