We can act on the screen

examples/component/selectable_input.cpp

@@ -55,6 +55,9 @@ int main() {
 
   // Tweak how the component tree is rendered:
   auto renderer = Renderer(component, [&] {
+
+    textToCopy = screen.getSelection();
+
     return vbox({
                hbox(text(" First name : "), input_first_name->Render()),
                hbox(text(" Last name  : ") | selectable(), input_last_name->Render()),

include/ftxui/component/screen_interactive.hpp

@@ -32,7 +32,6 @@ typedef struct {
   uint16_t endx = 0;
   uint16_t starty = 0;
   uint16_t endy = 0;
-  bool changed = false;
 } Region;
 
 class ScreenInteractive : public Screen {
@@ -77,6 +76,8 @@ class ScreenInteractive : public Screen {
   void ForceHandleCtrlC(bool force);
   void ForceHandleCtrlZ(bool force);
 
+  std::string getSelection(void);
+
  private:
   void ExitNow();
 
@@ -92,7 +93,7 @@ class ScreenInteractive : public Screen {
 
   void HandleTask(Component component, Task& task);
   bool selectableCatchEvent(Event event);
-  std::string getSelection(void);
+  void refreshSelection(void);
   void Draw(Component component);
   void ResetCursorPosition();
 

include/ftxui/dom/elements.hpp

@@ -116,9 +116,6 @@ Element hyperlink(std::string link, Element child);
 Element selectable(Element child);
 Decorator selectable(void);
 
-// -- Selection --
-std::string getSelection(void);
-
 // --- Layout is
 // Horizontal, Vertical or stacked set of elements.
 Element hbox(Elements);

src/ftxui/component/screen_interactive.cpp

@@ -853,15 +853,15 @@ bool ScreenInteractive::selectableCatchEvent(Event event) {
         selectedRegion.starty = mouse.y;
         selectedRegion.endx = mouse.x;
         selectedRegion.endy = mouse.y;
-        selectedRegion.changed = true;
+        refreshSelection();
       } else if (mouse.motion == Mouse::Released) {
         selectedRegion.endx = mouse.x;
         selectedRegion.endy = mouse.y;
-        selectedRegion.changed = true;
+        refreshSelection();
       } else if (mouse.motion == Mouse::Moved) {
         selectedRegion.endx = mouse.x;
         selectedRegion.endy = mouse.y;
-        selectedRegion.changed = true;
+        refreshSelection();
       }
     }
   }
@@ -869,8 +869,18 @@ bool ScreenInteractive::selectableCatchEvent(Event event) {
   return false;
 }
 
+void ScreenInteractive::refreshSelection(void) {
+
+  for (int y = std::min(selectedRegion.starty, selectedRegion.endy); y <= std::max(selectedRegion.starty, selectedRegion.endy); ++y) {
+    for (int x = std::min(selectedRegion.startx, selectedRegion.endx); x <= std::max(selectedRegion.startx, selectedRegion.endx)-1; ++x) {
+      PixelAt(x, y).inverted ^= true;
+      //selectedText += PixelAt(x, y).character;
+    }
+  }
+}
+
 std::string ScreenInteractive::getSelection(void) {
-    return "Selection";
+    return "Kikoo";
 }
 
 // private