phylactery.cpp

demonstrates how to create a custom control with xtd::forms::user_control control.

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#include <xtd/xtd>
 
class phylactery : public user_control {
public:
  [[nodiscard]] const color& border_color() const noexcept {return border_color_;}
  phylactery& border_color(const color& value) noexcept {
    if (value == border_color_) return self_;
    border_color_ = value;
    on_border_color_changed(event_args::empty);
    return self_;
  }
  
  [[nodiscard]] const single& border_width() const noexcept {return border_width_;}
  phylactery& border_width(single value) noexcept {
    if (value == border_width_) return self_;
    border_width_ = value;
    on_border_width_changed(event_args::empty);
    return self_;
  }
  
  [[nodiscard]] const color& phylactery_color() const noexcept {return phylactery_color_;}
  phylactery& phylactery_color(const color& value) noexcept {
    if (value == phylactery_color_) return self_;
    phylactery_color_ = value;
    on_phylactery_color_changed(event_args::empty);
    return self_;
  }
  
  event<phylactery, event_handler> border_color_changed;
  event<phylactery, event_handler> border_width_changed;
  event<phylactery, event_handler> phylactery_color_changed;
  
protected:
  virtual auto on_border_color_changed(const event_args& e) -> void {
    invalidate();
    auto border_color_changed_safe = border_color_changed;
    if (border_color_changed_safe.is_empty()) return;
    border_color_changed_safe(self_, e);
  }
  
  virtual auto on_border_width_changed(const event_args& e) -> void {
    invalidate();
    auto border_width_changed_safe = border_width_changed;
    if (border_width_changed_safe.is_empty()) return;
    border_width_changed_safe(self_, e);
  }
  
  virtual auto on_phylactery_color_changed(const event_args& e) -> void {
    invalidate();
    auto phylactery_color_changed_safe = phylactery_color_changed;
    if (phylactery_color_changed_safe.is_empty()) return;
    phylactery_color_changed_safe(self_, e);
  }
 
  auto on_paint(paint_event_args& e) -> void override {
    user_control::on_paint(e);
    
    auto clip = e.clip_rectangle();
    auto ellipse = rectangle_f {border_width_, border_width_, clip.width - 2 * border_width_, clip.height * 0.85f - 2 * border_width_};
    auto tip = array<point_f> {{clip.x + 60.0f + clip.width * 0.15f, clip.height - clip.height * 0.25f - 2 * border_width_}, {clip.x + 60.0f + clip.width * 0.05f, clip.height - 2 * border_width_}, {clip.x + 60.0f + clip.width * 0.30f, clip.height - clip.height * 0.25f - 2 * border_width_}};
    
    e.graphics().smoothing_mode(xtd::drawing::drawing_2d::smoothing_mode::anti_alias);
    e.graphics().text_rendering_hint(xtd::drawing::text::text_rendering_hint::clear_type_grid_fit);
    e.graphics().draw_ellipse(drawing::pen {border_color_, border_width_}, ellipse);
    e.graphics().fill_polygon(solid_brush {phylactery_color_}, tip);
    e.graphics().draw_polygon(drawing::pen {border_color_, border_width_}, tip);
    e.graphics().fill_ellipse(solid_brush {phylactery_color_}, ellipse.inflate(ellipse, size_f {-border_width_ / 2.0f, -border_width_ / 2.0f}));
    e.graphics().draw_string(text(), {system_fonts::default_font(), clip.height / 8.0f, font_style::bold}, solid_brush {fore_color()}, ellipse, string_format().alignment(string_alignment::center).line_alignment(string_alignment::center));
  }
  
private:
  color border_color_ = color::dark_gray;
  single border_width_ = 4.0f;
  color phylactery_color_ = color::white;
};
 
class form1 final : public form {
public:
  form1() {
    self_
      .text("Phylactery")
      .back_color(color::from_argb(0xffc1d0ff))
      .client_size({600, 300})
      .minimum_client_size({300, 150})
      .controls().add_range({hello_world_phylactery_, quit_button_});
    
    hello_world_phylactery_
      .border_color(color::from_argb(0xFF6F6F6F))
      .border_width(5.2f)
      .phylactery_color(color::light_goldenrod_yellow)
      .text("Hello, World")
      .bounds({100, 30, 400, 200})
      .fore_color(color::blue)
      .anchor(anchor_styles::left | anchor_styles::top | anchor_styles::right | anchor_styles::bottom);
    
    quit_button_
      .text("Quit")
      .bounds({425, 240, 120, 32})
      .back_color(color::black)
      .fore_color(color::white)
      .anchor(anchor_styles::right | anchor_styles::bottom)
      .click += {*this, &form::close};
  }
  
private:
  phylactery hello_world_phylactery_;
  button quit_button_;
};
 
auto main() -> int {
  application::run(form1 {});
}