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nuklear
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nuklear/src/nuklear_slider.c

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#include "nuklear.h"
#include "nuklear_internal.h"
/* ===============================================================
*
* SLIDER
*
* ===============================================================*/
NK_LIB float
nk_slider_behavior(nk_flags *state, struct nk_rect *logical_cursor,
struct nk_rect *visual_cursor, struct nk_input *in,
struct nk_rect bounds, float slider_min, float slider_max, float slider_value,
float slider_step, float slider_steps)
{
int left_mouse_down;
int left_mouse_click_in_cursor;
/* check if visual cursor is being dragged */
nk_widget_state_reset(state);
left_mouse_down = in && in->mouse.buttons[NK_BUTTON_LEFT].down;
left_mouse_click_in_cursor = in && nk_input_has_mouse_click_down_in_rect(in,
NK_BUTTON_LEFT, *visual_cursor, nk_true);
if (left_mouse_down && left_mouse_click_in_cursor) {
float ratio = 0;
const float d = in->mouse.pos.x - (visual_cursor->x+visual_cursor->w*0.5f);
const float pxstep = bounds.w / slider_steps;
/* only update value if the next slider step is reached */
*state = NK_WIDGET_STATE_ACTIVE;
if (NK_ABS(d) >= pxstep) {
const float steps = (float)((int)(NK_ABS(d) / pxstep));
slider_value += (d > 0) ? (slider_step*steps) : -(slider_step*steps);
slider_value = NK_CLAMP(slider_min, slider_value, slider_max);
ratio = (slider_value - slider_min)/slider_step;
logical_cursor->x = bounds.x + (logical_cursor->w * ratio);
in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.x = logical_cursor->x;
}
}
/* slider widget state */
if (nk_input_is_mouse_hovering_rect(in, bounds))
*state = NK_WIDGET_STATE_HOVERED;
if (*state & NK_WIDGET_STATE_HOVER &&
!nk_input_is_mouse_prev_hovering_rect(in, bounds))
*state |= NK_WIDGET_STATE_ENTERED;
else if (nk_input_is_mouse_prev_hovering_rect(in, bounds))
*state |= NK_WIDGET_STATE_LEFT;
return slider_value;
}
NK_LIB void
nk_draw_slider(struct nk_command_buffer *out, nk_flags state,
const struct nk_style_slider *style, const struct nk_rect *bounds,
const struct nk_rect *visual_cursor, float min, float value, float max)
{
struct nk_rect fill;
struct nk_rect bar;
const struct nk_style_item *background;
/* select correct slider images/colors */
struct nk_color bar_color;
const struct nk_style_item *cursor;
NK_UNUSED(min);
NK_UNUSED(max);
NK_UNUSED(value);
if (state & NK_WIDGET_STATE_ACTIVED) {
background = &style->active;
bar_color = style->bar_active;
cursor = &style->cursor_active;
} else if (state & NK_WIDGET_STATE_HOVER) {
background = &style->hover;
bar_color = style->bar_hover;
cursor = &style->cursor_hover;
} else {
background = &style->normal;
bar_color = style->bar_normal;
cursor = &style->cursor_normal;
}
/* calculate slider background bar */
bar.x = bounds->x;
bar.y = (visual_cursor->y + visual_cursor->h/2) - bounds->h/12;
bar.w = bounds->w;
bar.h = bounds->h/6;
/* filled background bar style */
fill.w = (visual_cursor->x + (visual_cursor->w/2.0f)) - bar.x;
fill.x = bar.x;
fill.y = bar.y;
fill.h = bar.h;
/* draw background */
if (background->type == NK_STYLE_ITEM_IMAGE) {
nk_draw_image(out, *bounds, &background->data.image, nk_white);
} else {
nk_fill_rect(out, *bounds, style->rounding, background->data.color);
nk_stroke_rect(out, *bounds, style->rounding, style->border, style->border_color);
}
/* draw slider bar */
nk_fill_rect(out, bar, style->rounding, bar_color);
nk_fill_rect(out, fill, style->rounding, style->bar_filled);
/* draw cursor */
if (cursor->type == NK_STYLE_ITEM_IMAGE)
nk_draw_image(out, *visual_cursor, &cursor->data.image, nk_white);
else nk_fill_circle(out, *visual_cursor, cursor->data.color);
}
NK_LIB float
nk_do_slider(nk_flags *state,
struct nk_command_buffer *out, struct nk_rect bounds,
float min, float val, float max, float step,
const struct nk_style_slider *style, struct nk_input *in,
const struct nk_user_font *font)
{
float slider_range;
float slider_min;
float slider_max;
float slider_value;
float slider_steps;
float cursor_offset;
struct nk_rect visual_cursor;
struct nk_rect logical_cursor;
NK_ASSERT(style);
NK_ASSERT(out);
if (!out || !style)
return 0;
/* remove padding from slider bounds */
bounds.x = bounds.x + style->padding.x;
bounds.y = bounds.y + style->padding.y;
bounds.h = NK_MAX(bounds.h, 2*style->padding.y);
bounds.w = NK_MAX(bounds.w, 2*style->padding.x + style->cursor_size.x);
bounds.w -= 2 * style->padding.x;
bounds.h -= 2 * style->padding.y;
/* optional buttons */
if (style->show_buttons) {
nk_flags ws;
struct nk_rect button;
button.y = bounds.y;
button.w = bounds.h;
button.h = bounds.h;
/* decrement button */
button.x = bounds.x;
if (nk_do_button_symbol(&ws, out, button, style->dec_symbol, NK_BUTTON_DEFAULT,
&style->dec_button, in, font))
val -= step;
/* increment button */
button.x = (bounds.x + bounds.w) - button.w;
if (nk_do_button_symbol(&ws, out, button, style->inc_symbol, NK_BUTTON_DEFAULT,
&style->inc_button, in, font))
val += step;
bounds.x = bounds.x + button.w + style->spacing.x;
bounds.w = bounds.w - (2*button.w + 2*style->spacing.x);
}
/* remove one cursor size to support visual cursor */
bounds.x += style->cursor_size.x*0.5f;
bounds.w -= style->cursor_size.x;
/* make sure the provided values are correct */
slider_max = NK_MAX(min, max);
slider_min = NK_MIN(min, max);
slider_value = NK_CLAMP(slider_min, val, slider_max);
slider_range = slider_max - slider_min;
slider_steps = slider_range / step;
cursor_offset = (slider_value - slider_min) / step;
/* calculate cursor
Basically you have two cursors. One for visual representation and interaction
and one for updating the actual cursor value. */
logical_cursor.h = bounds.h;
logical_cursor.w = bounds.w / slider_steps;
logical_cursor.x = bounds.x + (logical_cursor.w * cursor_offset);
logical_cursor.y = bounds.y;
visual_cursor.h = style->cursor_size.y;
visual_cursor.w = style->cursor_size.x;
visual_cursor.y = (bounds.y + bounds.h*0.5f) - visual_cursor.h*0.5f;
visual_cursor.x = logical_cursor.x - visual_cursor.w*0.5f;
slider_value = nk_slider_behavior(state, &logical_cursor, &visual_cursor,
in, bounds, slider_min, slider_max, slider_value, step, slider_steps);
visual_cursor.x = logical_cursor.x - visual_cursor.w*0.5f;
/* draw slider */
if (style->draw_begin) style->draw_begin(out, style->userdata);
nk_draw_slider(out, *state, style, &bounds, &visual_cursor, slider_min, slider_value, slider_max);
if (style->draw_end) style->draw_end(out, style->userdata);
return slider_value;
}
NK_API int
nk_slider_float(struct nk_context *ctx, float min_value, float *value, float max_value,
float value_step)
{
struct nk_window *win;
struct nk_panel *layout;
struct nk_input *in;
const struct nk_style *style;
int ret = 0;
float old_value;
struct nk_rect bounds;
enum nk_widget_layout_states state;
NK_ASSERT(ctx);
NK_ASSERT(ctx->current);
NK_ASSERT(ctx->current->layout);
NK_ASSERT(value);
if (!ctx || !ctx->current || !ctx->current->layout || !value)
return ret;
win = ctx->current;
style = &ctx->style;
layout = win->layout;
state = nk_widget(&bounds, ctx);
if (!state) return ret;
in = (/*state == NK_WIDGET_ROM || */ layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
old_value = *value;
*value = nk_do_slider(&ctx->last_widget_state, &win->buffer, bounds, min_value,
old_value, max_value, value_step, &style->slider, in, style->font);
return (old_value > *value || old_value < *value);
}
NK_API float
nk_slide_float(struct nk_context *ctx, float min, float val, float max, float step)
{
nk_slider_float(ctx, min, &val, max, step); return val;
}
NK_API int
nk_slide_int(struct nk_context *ctx, int min, int val, int max, int step)
{
float value = (float)val;
nk_slider_float(ctx, (float)min, &value, (float)max, (float)step);
return (int)value;
}
NK_API int
nk_slider_int(struct nk_context *ctx, int min, int *val, int max, int step)
{
int ret;
float value = (float)*val;
ret = nk_slider_float(ctx, (float)min, &value, (float)max, (float)step);
*val = (int)value;
return ret;
}
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