scrollable_control.h

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#pragma once
#include "control.h"
#include "system_information.h"
 
namespace xtd {
  namespace forms {
    class forms_export_ scrollable_control : public control {
    public:
      virtual bool auto_scroll() const {return auto_scroll_;}
      virtual scrollable_control& auto_scroll(bool auto_scroll) {
        if (auto_scroll_ != auto_scroll) {
          auto_scroll_ = auto_scroll;
          recreate_handle();
        }
        return *this;
      }
 
      drawing::size auto_scroll_margin() const {return auto_scroll_margin_;}
      scrollable_control& auto_scroll_margin(const drawing::size& value) {
        if (auto_scroll_margin_ != value) {
          auto_scroll_margin_ = value;
          perform_layout();
        }
        return *this;
      }
 
      drawing::rectangle display_rectangle() const override {return display_rectangle_;}
      
      virtual bool h_scroll() const {return h_scroll_;}
      virtual scrollable_control& h_scroll(bool h_scroll) {
        if (h_scroll_ != h_scroll) {
          h_scroll_ = h_scroll;
          recreate_handle();
        }
        return *this;
      }
 
      virtual bool v_scroll() const {return v_scroll_;}
      virtual scrollable_control& v_scroll(bool v_scroll) {
        if (v_scroll_ != v_scroll) {
          v_scroll_ = v_scroll;
          recreate_handle();
        }
        return *this;
      }
 
    protected:
      scrollable_control() = default;
 
      forms::create_params create_params() const override;
 
      void on_layout(const event_args& e) override {
        control::on_layout(e);
        if (auto_scroll_) {
          display_rectangle_ = client_rectangle_;
          display_rectangle_.height(display_rectangle_.height() - system_information::horizontal_scroll_bar_height());
          display_rectangle_.width(display_rectangle_.width() - system_information::vertical_scroll_bar_width());
          for (auto item : controls()) {
            if (item.get().visible())
              display_rectangle_ = drawing::rectangle::make_union(display_rectangle_, item.get().bounds());
          }
          display_rectangle_.width(display_rectangle_.width() + auto_scroll_margin_.width());
          display_rectangle_.height(display_rectangle_.height() + auto_scroll_margin_.height());
        }
      }
 
      bool auto_scroll_ = false;
      bool h_scroll_ = false;
      bool v_scroll_ = false;
      drawing::rectangle display_rectangle_;
      drawing::size auto_scroll_margin_;
    };
  }
}