mirror of https://github.com/vurtun/nuklear.git
295 lines
11 KiB
C
295 lines
11 KiB
C
#include "nuklear.h"
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#include "nuklear_internal.h"
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/* ===============================================================
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*
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* SCROLLBAR
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*
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* ===============================================================*/
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NK_LIB float
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nk_scrollbar_behavior(nk_flags *state, struct nk_input *in,
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int has_scrolling, const struct nk_rect *scroll,
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const struct nk_rect *cursor, const struct nk_rect *empty0,
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const struct nk_rect *empty1, float scroll_offset,
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float target, float scroll_step, enum nk_orientation o)
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{
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nk_flags ws = 0;
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int left_mouse_down;
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int left_mouse_click_in_cursor;
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float scroll_delta;
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nk_widget_state_reset(state);
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if (!in) return scroll_offset;
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left_mouse_down = in->mouse.buttons[NK_BUTTON_LEFT].down;
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left_mouse_click_in_cursor = nk_input_has_mouse_click_down_in_rect(in,
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NK_BUTTON_LEFT, *cursor, nk_true);
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if (nk_input_is_mouse_hovering_rect(in, *scroll))
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*state = NK_WIDGET_STATE_HOVERED;
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scroll_delta = (o == NK_VERTICAL) ? in->mouse.scroll_delta.y: in->mouse.scroll_delta.x;
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if (left_mouse_down && left_mouse_click_in_cursor) {
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/* update cursor by mouse dragging */
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float pixel, delta;
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*state = NK_WIDGET_STATE_ACTIVE;
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if (o == NK_VERTICAL) {
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float cursor_y;
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pixel = in->mouse.delta.y;
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delta = (pixel / scroll->h) * target;
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scroll_offset = NK_CLAMP(0, scroll_offset + delta, target - scroll->h);
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cursor_y = scroll->y + ((scroll_offset/target) * scroll->h);
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in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.y = cursor_y + cursor->h/2.0f;
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} else {
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float cursor_x;
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pixel = in->mouse.delta.x;
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delta = (pixel / scroll->w) * target;
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scroll_offset = NK_CLAMP(0, scroll_offset + delta, target - scroll->w);
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cursor_x = scroll->x + ((scroll_offset/target) * scroll->w);
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in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.x = cursor_x + cursor->w/2.0f;
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}
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} else if ((nk_input_is_key_pressed(in, NK_KEY_SCROLL_UP) && o == NK_VERTICAL && has_scrolling)||
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nk_button_behavior(&ws, *empty0, in, NK_BUTTON_DEFAULT)) {
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/* scroll page up by click on empty space or shortcut */
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if (o == NK_VERTICAL)
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scroll_offset = NK_MAX(0, scroll_offset - scroll->h);
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else scroll_offset = NK_MAX(0, scroll_offset - scroll->w);
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} else if ((nk_input_is_key_pressed(in, NK_KEY_SCROLL_DOWN) && o == NK_VERTICAL && has_scrolling) ||
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nk_button_behavior(&ws, *empty1, in, NK_BUTTON_DEFAULT)) {
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/* scroll page down by click on empty space or shortcut */
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if (o == NK_VERTICAL)
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scroll_offset = NK_MIN(scroll_offset + scroll->h, target - scroll->h);
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else scroll_offset = NK_MIN(scroll_offset + scroll->w, target - scroll->w);
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} else if (has_scrolling) {
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if ((scroll_delta < 0 || (scroll_delta > 0))) {
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/* update cursor by mouse scrolling */
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scroll_offset = scroll_offset + scroll_step * (-scroll_delta);
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if (o == NK_VERTICAL)
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scroll_offset = NK_CLAMP(0, scroll_offset, target - scroll->h);
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else scroll_offset = NK_CLAMP(0, scroll_offset, target - scroll->w);
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} else if (nk_input_is_key_pressed(in, NK_KEY_SCROLL_START)) {
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/* update cursor to the beginning */
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if (o == NK_VERTICAL) scroll_offset = 0;
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} else if (nk_input_is_key_pressed(in, NK_KEY_SCROLL_END)) {
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/* update cursor to the end */
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if (o == NK_VERTICAL) scroll_offset = target - scroll->h;
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}
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}
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if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, *scroll))
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*state |= NK_WIDGET_STATE_ENTERED;
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else if (nk_input_is_mouse_prev_hovering_rect(in, *scroll))
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*state |= NK_WIDGET_STATE_LEFT;
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return scroll_offset;
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}
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NK_LIB void
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nk_draw_scrollbar(struct nk_command_buffer *out, nk_flags state,
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const struct nk_style_scrollbar *style, const struct nk_rect *bounds,
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const struct nk_rect *scroll)
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{
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const struct nk_style_item *background;
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const struct nk_style_item *cursor;
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/* select correct colors/images to draw */
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if (state & NK_WIDGET_STATE_ACTIVED) {
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background = &style->active;
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cursor = &style->cursor_active;
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} else if (state & NK_WIDGET_STATE_HOVER) {
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background = &style->hover;
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cursor = &style->cursor_hover;
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} else {
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background = &style->normal;
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cursor = &style->cursor_normal;
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}
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/* draw background */
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if (background->type == NK_STYLE_ITEM_COLOR) {
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nk_fill_rect(out, *bounds, style->rounding, background->data.color);
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nk_stroke_rect(out, *bounds, style->rounding, style->border, style->border_color);
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} else {
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nk_draw_image(out, *bounds, &background->data.image, nk_white);
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}
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/* draw cursor */
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if (cursor->type == NK_STYLE_ITEM_COLOR) {
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nk_fill_rect(out, *scroll, style->rounding_cursor, cursor->data.color);
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nk_stroke_rect(out, *scroll, style->rounding_cursor, style->border_cursor, style->cursor_border_color);
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} else nk_draw_image(out, *scroll, &cursor->data.image, nk_white);
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}
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NK_LIB float
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nk_do_scrollbarv(nk_flags *state,
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struct nk_command_buffer *out, struct nk_rect scroll, int has_scrolling,
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float offset, float target, float step, float button_pixel_inc,
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const struct nk_style_scrollbar *style, struct nk_input *in,
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const struct nk_user_font *font)
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{
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struct nk_rect empty_north;
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struct nk_rect empty_south;
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struct nk_rect cursor;
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float scroll_step;
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float scroll_offset;
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float scroll_off;
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float scroll_ratio;
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NK_ASSERT(out);
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NK_ASSERT(style);
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NK_ASSERT(state);
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if (!out || !style) return 0;
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scroll.w = NK_MAX(scroll.w, 1);
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scroll.h = NK_MAX(scroll.h, 0);
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if (target <= scroll.h) return 0;
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/* optional scrollbar buttons */
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if (style->show_buttons) {
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nk_flags ws;
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float scroll_h;
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struct nk_rect button;
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button.x = scroll.x;
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button.w = scroll.w;
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button.h = scroll.w;
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scroll_h = NK_MAX(scroll.h - 2 * button.h,0);
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scroll_step = NK_MIN(step, button_pixel_inc);
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/* decrement button */
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button.y = scroll.y;
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if (nk_do_button_symbol(&ws, out, button, style->dec_symbol,
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NK_BUTTON_REPEATER, &style->dec_button, in, font))
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offset = offset - scroll_step;
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/* increment button */
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button.y = scroll.y + scroll.h - button.h;
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if (nk_do_button_symbol(&ws, out, button, style->inc_symbol,
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NK_BUTTON_REPEATER, &style->inc_button, in, font))
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offset = offset + scroll_step;
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scroll.y = scroll.y + button.h;
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scroll.h = scroll_h;
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}
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/* calculate scrollbar constants */
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scroll_step = NK_MIN(step, scroll.h);
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scroll_offset = NK_CLAMP(0, offset, target - scroll.h);
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scroll_ratio = scroll.h / target;
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scroll_off = scroll_offset / target;
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/* calculate scrollbar cursor bounds */
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cursor.h = NK_MAX((scroll_ratio * scroll.h) - (2*style->border + 2*style->padding.y), 0);
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cursor.y = scroll.y + (scroll_off * scroll.h) + style->border + style->padding.y;
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cursor.w = scroll.w - (2 * style->border + 2 * style->padding.x);
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cursor.x = scroll.x + style->border + style->padding.x;
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/* calculate empty space around cursor */
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empty_north.x = scroll.x;
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empty_north.y = scroll.y;
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empty_north.w = scroll.w;
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empty_north.h = NK_MAX(cursor.y - scroll.y, 0);
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empty_south.x = scroll.x;
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empty_south.y = cursor.y + cursor.h;
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empty_south.w = scroll.w;
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empty_south.h = NK_MAX((scroll.y + scroll.h) - (cursor.y + cursor.h), 0);
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/* update scrollbar */
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scroll_offset = nk_scrollbar_behavior(state, in, has_scrolling, &scroll, &cursor,
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&empty_north, &empty_south, scroll_offset, target, scroll_step, NK_VERTICAL);
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scroll_off = scroll_offset / target;
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cursor.y = scroll.y + (scroll_off * scroll.h) + style->border_cursor + style->padding.y;
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/* draw scrollbar */
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if (style->draw_begin) style->draw_begin(out, style->userdata);
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nk_draw_scrollbar(out, *state, style, &scroll, &cursor);
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if (style->draw_end) style->draw_end(out, style->userdata);
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return scroll_offset;
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}
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NK_LIB float
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nk_do_scrollbarh(nk_flags *state,
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struct nk_command_buffer *out, struct nk_rect scroll, int has_scrolling,
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float offset, float target, float step, float button_pixel_inc,
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const struct nk_style_scrollbar *style, struct nk_input *in,
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const struct nk_user_font *font)
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{
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struct nk_rect cursor;
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struct nk_rect empty_west;
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struct nk_rect empty_east;
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float scroll_step;
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float scroll_offset;
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float scroll_off;
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float scroll_ratio;
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NK_ASSERT(out);
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NK_ASSERT(style);
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if (!out || !style) return 0;
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/* scrollbar background */
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scroll.h = NK_MAX(scroll.h, 1);
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scroll.w = NK_MAX(scroll.w, 2 * scroll.h);
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if (target <= scroll.w) return 0;
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/* optional scrollbar buttons */
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if (style->show_buttons) {
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nk_flags ws;
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float scroll_w;
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struct nk_rect button;
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button.y = scroll.y;
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button.w = scroll.h;
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button.h = scroll.h;
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scroll_w = scroll.w - 2 * button.w;
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scroll_step = NK_MIN(step, button_pixel_inc);
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/* decrement button */
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button.x = scroll.x;
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if (nk_do_button_symbol(&ws, out, button, style->dec_symbol,
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NK_BUTTON_REPEATER, &style->dec_button, in, font))
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offset = offset - scroll_step;
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/* increment button */
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button.x = scroll.x + scroll.w - button.w;
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if (nk_do_button_symbol(&ws, out, button, style->inc_symbol,
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NK_BUTTON_REPEATER, &style->inc_button, in, font))
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offset = offset + scroll_step;
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scroll.x = scroll.x + button.w;
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scroll.w = scroll_w;
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}
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/* calculate scrollbar constants */
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scroll_step = NK_MIN(step, scroll.w);
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scroll_offset = NK_CLAMP(0, offset, target - scroll.w);
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scroll_ratio = scroll.w / target;
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scroll_off = scroll_offset / target;
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/* calculate cursor bounds */
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cursor.w = (scroll_ratio * scroll.w) - (2*style->border + 2*style->padding.x);
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cursor.x = scroll.x + (scroll_off * scroll.w) + style->border + style->padding.x;
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cursor.h = scroll.h - (2 * style->border + 2 * style->padding.y);
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cursor.y = scroll.y + style->border + style->padding.y;
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/* calculate empty space around cursor */
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empty_west.x = scroll.x;
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empty_west.y = scroll.y;
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empty_west.w = cursor.x - scroll.x;
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empty_west.h = scroll.h;
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empty_east.x = cursor.x + cursor.w;
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empty_east.y = scroll.y;
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empty_east.w = (scroll.x + scroll.w) - (cursor.x + cursor.w);
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empty_east.h = scroll.h;
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/* update scrollbar */
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scroll_offset = nk_scrollbar_behavior(state, in, has_scrolling, &scroll, &cursor,
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&empty_west, &empty_east, scroll_offset, target, scroll_step, NK_HORIZONTAL);
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scroll_off = scroll_offset / target;
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cursor.x = scroll.x + (scroll_off * scroll.w);
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/* draw scrollbar */
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if (style->draw_begin) style->draw_begin(out, style->userdata);
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nk_draw_scrollbar(out, *state, style, &scroll, &cursor);
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if (style->draw_end) style->draw_end(out, style->userdata);
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return scroll_offset;
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}
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