Class DragDropSource

examples/Showcase/examples_frame.cpp:98–133

};

class DragDropSource : public visage::Frame {
public:
  void draw(visage::Canvas& canvas) override {
    canvas.setColor(DarkBackgroundColor);
    canvas.roundedRectangle(0, 0, width(), height(), height() / 16);

    canvas.setColor(TextColor);

    const visage::Font font(height() / 4, resources::fonts::Lato_Regular_ttf);
    if (dragging_)
      canvas.text("Dragging source file", font, visage::Font::kCenter, 0, 0, width(), height());
    else
      canvas.text("Drag source", font, visage::Font::kCenter, 0, 0, width(), height());
  }

  bool isDragDropSource() override { return true; }

  std::string startDragDropSource() override {
    redraw();
    dragging_ = true;
    source_file_ = visage::createTemporaryFile("txt");
    visage::replaceFileWithText(source_file_, "Example drag and drop source file.");
    return source_file_.string();
  }

  void cleanupDragDropSource() override {
    redraw();
    dragging_ = false;
    if (std::filesystem::exists(source_file_))
      std::filesystem::remove(source_file_);
  }

private:
  bool dragging_ = false;
  visage::File source_file_;
};

class DragDropTarget : public visage::Frame {
public: