pgpl/src/gui/helpers.c

#include <pgpl.h>

void pgpl_gui_theme_configure(PGPL_GuiTheme *theme, PGPL_Color base_color,
                              double content_font_size, PGPL_Font *font) {
  theme->background_color = pgpl_color_divide(base_color, 8);

  theme->widget_background_color[0] = pgpl_color_divide(base_color, 5);
  theme->widget_background_color[1] = pgpl_color_divide(base_color, 4);
  theme->widget_background_color[2] = pgpl_color_divide(base_color, 3);

  theme->text_color[0] = pgpl_color_divide(base_color, 1.5);
  theme->text_color[1] = pgpl_color_divide(base_color, 1.25);
  theme->text_color[2] = base_color;

  theme->font_size[0] = content_font_size * 3;
  theme->font_size[1] = content_font_size * 2;
  theme->font_size[2] = content_font_size;

  theme->margin.top = content_font_size / 6;
  theme->margin.left = theme->margin.top;
  theme->margin.bottom = theme->margin.top;
  theme->margin.right = theme->margin.top;

  theme->border.top = content_font_size / 12;
  theme->border.left = theme->border.top;
  theme->border.bottom = theme->border.top;
  theme->border.right = theme->border.top;

  theme->padding.top = content_font_size / 6;
  theme->padding.left = theme->padding.top;
  theme->padding.bottom = theme->padding.top;
  theme->padding.right = theme->padding.top;

  theme->font = font;
}

void pgpl_gui_widget_adjust_event_params(PGPL_GuiWidget *widget,
                                         PGPL_GuiTheme *theme, double *x,
                                         double *y, double *max_width,
                                         double *max_height) {
  double width, height;

  pgpl_gui_widget_max_content_size(widget, theme, &width, &height, *max_width,
                                   *max_height);

  widget->get_content_size(widget, theme, &width, &height, width, height);

  if (!widget->expand_x) {
    *max_width = width;
    if (!widget->ignore_margin) {
      *max_width += theme->margin.left + theme->margin.right;
    }
    if (!widget->ignore_border) {
      *max_width += theme->border.left + theme->border.right;
    }
    if (!widget->ignore_padding) {
      *max_width += theme->padding.left + theme->padding.right;
    }
  }

  if (!widget->expand_y) {
    *max_height = height;
    if (!widget->ignore_margin) {
      *max_height += theme->margin.top + theme->margin.bottom;
    }
    if (!widget->ignore_border) {
      *max_height += theme->border.top + theme->border.bottom;
    }
    if (!widget->ignore_padding) {
      *max_height += theme->padding.top + theme->padding.bottom;
    }
  }

  if (!widget->ignore_margin) {
    *x += theme->margin.left;
    *y += theme->margin.top;

    *max_width -= theme->margin.left + theme->margin.right;
    *max_height -= theme->margin.top + theme->margin.bottom;
  }

  if (!widget->ignore_border) {
    *x += theme->border.left;
    *y += theme->border.top;

    *max_width -= theme->border.left + theme->border.right;
    *max_height -= theme->border.top + theme->border.bottom;
  }

  if (!widget->ignore_padding) {
    *x += theme->padding.left;
    *y += theme->padding.top;

    *max_width -= theme->padding.left + theme->padding.right;
    *max_height -= theme->padding.top + theme->padding.bottom;
  }

  *x += (*max_width - width) / 2;
  *y += (*max_height - height) / 2;
}

void pgpl_gui_widget_max_content_size(PGPL_GuiWidget *widget,
                                      PGPL_GuiTheme *theme, double *width,
                                      double *height, double max_width,
                                      double max_height) {
  *width = max_width;
  *height = max_height;

  if (!widget->ignore_margin) {
    *width -= theme->margin.left + theme->margin.right;
    *height -= theme->margin.top + theme->margin.bottom;
  }

  if (!widget->ignore_border) {
    *width -= theme->border.left + theme->border.right;
    *height -= theme->border.top + theme->border.bottom;
  }

  if (!widget->ignore_padding) {
    *width -= theme->padding.left + theme->padding.right;
    *height -= theme->padding.top + theme->padding.bottom;
  }
}

void pgpl_gui_widget_render_full(PGPL_GuiWidget *widget,
                                 PGPL_Renderer *renderer, PGPL_GuiTheme *theme,
                                 double x, double y, double max_width,
                                 double max_height) {
  double width, height;

  if (widget->theme_override) {
    theme = widget->theme_override;
  }

  x += widget->offset_x;
  y += widget->offset_y;

  pgpl_gui_widget_max_content_size(widget, theme, &width, &height, max_width,
                                   max_height);

  widget->get_content_size(widget, theme, &width, &height, width, height);

  if (!widget->expand_x) {
    max_width = width;
    if (!widget->ignore_margin) {
      max_width += theme->margin.left + theme->margin.right;
    }
    if (!widget->ignore_border) {
      max_width += theme->border.left + theme->border.right;
    }
    if (!widget->ignore_padding) {
      max_width += theme->padding.left + theme->padding.right;
    }
  }

  if (!widget->expand_y) {
    max_height = height;
    if (!widget->ignore_margin) {
      max_height += theme->margin.top + theme->margin.bottom;
    }
    if (!widget->ignore_border) {
      max_height += theme->border.top + theme->border.bottom;
    }
    if (!widget->ignore_padding) {
      max_height += theme->padding.top + theme->padding.bottom;
    }
  }

  if (!widget->ignore_margin) {
    x += theme->margin.left;
    y += theme->margin.top;

    max_width -= theme->margin.left + theme->margin.right;
    max_height -= theme->margin.top + theme->margin.bottom;
  }

  if (widget->border) {
    pgpl_render_rectangle(renderer, theme->text_color[widget->gui_color], x, y,
                          max_width, max_height);
  }

  if (!widget->ignore_border) {
    x += theme->border.left;
    y += theme->border.top;

    max_width -= theme->border.left + theme->border.right;
    max_height -= theme->border.top + theme->border.bottom;
  }

  if (widget->background) {
    pgpl_render_rectangle(renderer,
                          theme->widget_background_color[widget->gui_color], x,
                          y, max_width, max_height);
  } else {
    pgpl_render_rectangle(renderer, theme->background_color, x, y, max_width,
                          max_height);
  }

  if (!widget->ignore_padding) {
    x += theme->padding.left;
    y += theme->padding.top;

    max_width -= theme->padding.left + theme->padding.right;
    max_height -= theme->padding.top + theme->padding.bottom;
  }

  x += (max_width - width) / 2;
  y += (max_height - height) / 2;

  widget->render_content(widget, renderer, theme, x, y, max_width, max_height);
}

bool pgpl_gui_widget_within_area(double x, double y, double area_x,
                                 double area_y, double area_width,
                                 double area_height) {
  return (x >= area_x && x <= (area_x + area_width)) &&
         (y >= area_y && y <= (area_y + area_height));
}

bool pgpl_gui_widget_within_bounds(PGPL_GuiWidget *widget, PGPL_GuiTheme *theme,
                                   double widget_x, double widget_y,
                                   double max_width, double max_height,
                                   double x, double y) {
  (void)widget;

  widget_x += theme->margin.left;
  widget_y += theme->margin.top;

  max_width -= theme->margin.left + theme->margin.right;
  max_height -= theme->margin.top + theme->margin.bottom;

  return pgpl_gui_widget_within_area(x, y, widget_x, widget_y, max_width,
                                     max_height);
}

void pgpl_gui_widget_default_config(PGPL_GuiWidget *widget) {
  widget->offset_x = 0;
  widget->offset_y = 0;
  widget->expand_x = true;
  widget->expand_y = true;
  widget->border = false;
  widget->background = false;
  widget->font_size = PGPL_GUI_FONT_SIZE_CONTENT;
  widget->expansion_fraction = 1;
  widget->theme_override = NULL;
  widget->ignore_margin = false;
  widget->ignore_border = false;
  widget->ignore_padding = false;
}