public static void DrawScrollbar(this CommandBuffer _out_, uint state, nk_style_scrollbar style,
RectangleF *bounds, RectangleF *scroll)
{
nk_style_item background;
nk_style_item cursor;
if ((state & NK_WIDGET_STATE_ACTIVED) != 0)
{
background = style.active;
cursor = style.cursor_active;
}
else if ((state & NK_WIDGET_STATE_HOVER) != 0)
{
background = style.hover;
cursor = style.cursor_hover;
}
else
{
background = style.normal;
cursor = style.cursor_normal;
}
if (background.type == NK_STYLE_ITEM_COLOR)
{
_out_.FillRect(*bounds, style.Rounding, background.Color);
_out_.StrokeRect(*bounds, style.Rounding, style.border,
style.border_color);
}
else
{
_out_.DrawImage(*bounds, background.Image, nk_white);
}
if (background.type == NK_STYLE_ITEM_COLOR)
{
_out_.FillRect(*scroll, style.Rounding_cursor, cursor.Color);
_out_.StrokeRect(*scroll, style.Rounding_cursor,
style.border_cursor, style.cursor_border_color);
}
else
{
_out_.DrawImage(*scroll, cursor.Image, nk_white);
}
}
public static float nk_do_scrollbarh(ref uint state, CommandBuffer _out_, RectangleF scroll, bool has_scrolling,
float offset, float target, float step, float button_pixel_inc, nk_style_scrollbar style, nk_input _in_,
nk_font font)
{
var cursor = new RectangleF();
var empty_west = new RectangleF();
var empty_east = new RectangleF();
float scroll_step;
float scroll_offset;
float scroll_off;
float scroll_ratio;
if (_out_ == null || style == null)
{
return(0);
}
scroll.Height = scroll.Height < 1 ? 1 : scroll.Height;
scroll.Width = scroll.Width < 2 * scroll.Height ? 2 * scroll.Height : scroll.Width;
if (target <= scroll.Width)
{
return(0);
}
if (style.show_buttons != 0)
{
uint ws = 0;
float scroll_w;
var button = new RectangleF();
button.Y = scroll.Y;
button.Width = scroll.Height;
button.Height = scroll.Height;
scroll_w = scroll.Width - 2 * button.Width;
scroll_step = step < button_pixel_inc ? step : button_pixel_inc;
button.X = scroll.X;
if (
DoButtonSymbol(ref ws, _out_, button, style.dec_symbol,
NK_BUTTON_REPEATER,
style.dec_button, _in_, font))
{
offset = offset - scroll_step;
}
button.X = scroll.X + scroll.Width - button.Width;
if (
DoButtonSymbol(ref ws, _out_, button, style.inc_symbol,
NK_BUTTON_REPEATER,
style.inc_button, _in_, font))
{
offset = offset + scroll_step;
}
scroll.X = scroll.X + button.Width;
scroll.Width = scroll_w;
}
scroll_step = step < scroll.Width ? step : scroll.Width;
scroll_offset =
(offset < target - scroll.Width ? offset : target - scroll.Width) < 0
? 0
: offset < target - scroll.Width
? offset
: target - scroll.Width;
scroll_ratio = scroll.Width / target;
scroll_off = scroll_offset / target;
cursor.Width = scroll_ratio * scroll.Width - (2 * style.border + 2 * style.padding.X);
cursor.X = scroll.X + scroll_off * scroll.Width + style.border + style.padding.X;
cursor.Height = scroll.Height - (2 * style.border + 2 * style.padding.Y);
cursor.Y = scroll.Y + style.border + style.padding.Y;
empty_west.X = scroll.X;
empty_west.Y = scroll.Y;
empty_west.Width = cursor.X - scroll.X;
empty_west.Height = scroll.Height;
empty_east.X = cursor.X + cursor.Width;
empty_east.Y = scroll.Y;
empty_east.Width = scroll.X + scroll.Width - (cursor.X + cursor.Width);
empty_east.Height = scroll.Height;
scroll_offset =
nk_scrollbar_behavior(ref state, _in_, has_scrolling, &scroll, ref cursor, &empty_west, &empty_east,
scroll_offset, target, scroll_step, NK_HORIZONTAL);
scroll_off = scroll_offset / target;
cursor.X = scroll.X + scroll_off * scroll.Width;
if (style.draw_begin != null)
{
style.draw_begin(_out_);
}
_out_.DrawScrollbar(state, style, &scroll, &cursor);
if (style.draw_end != null)
{
style.draw_end(_out_);
}
return(scroll_offset);
}
