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#include "../../include/mgui/list.h"
#include "../../include/alloc.h"
#include <mgl/window/window.h>
#include <assert.h>
/*
TODO: Optimize for lists with 2 items or less by setting |items| and |items_capacity| to the first and second item
if num_items <= 2.
*/
static int max_int(int a, int b) {
return a >= b ? a : b;
}
mgui_list* mgui_list_create(mgui_list_direction direction) {
mgui_list *list = mgui_alloc(sizeof(mgui_list));
mgui_widget_init(&list->widget, MGUI_WIDGET_LIST);
list->direction = direction;
list->spacing = 0;
list->position = (mgl_vec2i){ 0, 0 };
list->items = NULL;
list->items_capacity = 0;
list->num_items = 0;
return list;
}
void mgui_list_destroy(mgui_list *list) {
for(size_t i = 0; i < list->num_items; ++i) {
mgui_widget_destroy(list->items[i].widget);
}
mgui_free(list->items);
mgui_free(list);
}
mgui_widget* mgui_list_to_widget(mgui_list *list) {
return &list->widget;
}
mgui_list* mgui_widget_to_list(mgui_widget *widget) {
assert(widget->type == MGUI_WIDGET_LIST);
return (mgui_list*)widget;
}
void mgui_list_set_spacing(mgui_list *self, int spacing) {
/* TODO: Multiply by scaling */
self->spacing = spacing;
/* TODO: mgui_list_calculate_size */
}
void mgui_list_set_position(mgui_list *self, mgl_vec2i position) {
self->position = position;
}
void mgui_list_calculate_size(mgui_list *self, mgl_vec2i max_size) {
const int total_spacing = max_int(0, self->num_items - 1) * self->spacing;
mgl_vec2i size = (mgl_vec2i){ 0, 0 };
switch(self->direction) {
case MGUI_LIST_HORIZONITAL: {
size.x = total_spacing;
max_size.x = max_int(0, max_size.x - total_spacing);
int num_expanded_widgets = 0;
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget *widget = self->items[i].widget;
if(widget->flags & MGUI_WIDGET_EXPAND_HORIZONTAL) {
++num_expanded_widgets;
} else {
mgui_widget_calculate_size(widget, max_size);
size.x += widget->size.x;
size.y = max_int(size.y, widget->size.y);
max_size.x -= widget->size.x;
}
}
if(num_expanded_widgets == 0)
break;
max_size.x = max_size.x / num_expanded_widgets;
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget *widget = self->items[i].widget;
if(widget->flags & MGUI_WIDGET_EXPAND_HORIZONTAL) {
mgui_widget_calculate_size(widget, max_size);
widget->size = max_size;
size.x += widget->size.x;
size.y = max_int(size.y, widget->size.y);
}
}
break;
}
case MGUI_LIST_VERTICAL: {
size.y = total_spacing;
max_size.y = max_int(0, max_size.y - total_spacing);
int num_expanded_widgets = 0;
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget *widget = self->items[i].widget;
if(widget->flags & MGUI_WIDGET_EXPAND_VERTICAL) {
++num_expanded_widgets;
} else {
mgui_widget_calculate_size(widget, max_size);
size.x = max_int(size.x, widget->size.x);
size.y += widget->size.y;
max_size.y -= widget->size.y;
}
}
if(num_expanded_widgets == 0)
break;
max_size.y = max_size.y / num_expanded_widgets;
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget *widget = self->items[i].widget;
if(widget->flags & MGUI_WIDGET_EXPAND_VERTICAL) {
mgui_widget_calculate_size(widget, max_size);
widget->size = max_size;
size.x = max_int(size.x, widget->size.x);
size.y += widget->size.y;
}
}
break;
}
}
self->widget.size = size;
}
static void mgui_list_ensure_capacity(mgui_list *self, size_t new_capacity) {
if(self->items_capacity >= new_capacity)
return;
size_t capacity = self->items_capacity;
if(capacity == 0)
capacity = 8;
while(capacity < new_capacity) {
capacity = capacity + (capacity >> 1); /* capacity *= 1.5 */
}
self->items = mgui_realloc(self->items, capacity);
self->items_capacity = capacity;
}
void mgui_list_append(mgui_list *self, mgui_widget *widget) {
mgui_widget_set_has_parent(widget);
mgui_list_ensure_capacity(self, (self->num_items + 1) * sizeof(mgui_list_item));
self->items[self->num_items].widget = widget;
++self->num_items;
}
void mgui_list_on_event(mgui_list *self, mgl_window *window, mgl_event *event) {
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget_on_event(self->items[i].widget, window, event);
}
}
/* TODO: Check if visible in scissor */
void mgui_list_draw(mgui_list *self, mgl_window *window) {
mgl_vec2i position = self->position;
/* TODO: Set scissor for each draw widget */
/* TODO: Only do this when a direct child widget is dirty */
//mgui_list_calculate_size(self);
mgl_scissor scissor;
mgl_window_get_scissor(window, &scissor);
switch(self->direction) {
case MGUI_LIST_HORIZONITAL: {
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget *widget = self->items[i].widget;
mgui_widget_set_position(widget, (mgl_vec2i){ position.x + widget->margin.left, position.y + widget->margin.top });
mgui_widget_draw(widget, window);
position.x += widget->size.x + self->spacing;
// if(position.x >= scissor.position.x + scissor.size.x)
// break;
}
break;
}
case MGUI_LIST_VERTICAL: {
for(size_t i = 0; i < self->num_items; ++i) {
mgui_widget *widget = self->items[i].widget;
mgui_widget_set_position(widget, (mgl_vec2i){ position.x + widget->margin.left, position.y + widget->margin.top });
mgui_widget_draw(widget, window);
position.y += widget->size.y + self->spacing;
// if(position.y >= scissor.position.y + scissor.size.y)
// break;
}
break;
}
}
}
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