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#include "../../include/mgui/scrollview.h"
#include "../../include/mgui/mgui.h"
#include "../../include/alloc.h"
#include <mgl/mgl.h>
#include <mgl/window/window.h>
#include <mgl/window/event.h>
#include <limits.h>
#include <assert.h>
#define SCROLL_ACCEL 20.0f
#define SCROLL_DEACCEL 10.0f
#define WIDGET_NATURAL_SIZE INT_MAX
static float max_float(float a, float b) {
return a >= b ? a : b;
}
static int max_int(int a, int b) {
return a >= b ? a : b;
}
static int min_int(int a, int b) {
return a <= b ? a : b;
}
static float abs_float(float value) {
return value >= 0.0f ? value : -value;
}
mgui_scrollview* mgui_scrollview_create() {
mgui_scrollview *scrollview = mgui_alloc(sizeof(mgui_scrollview));
mgui_widget_init(&scrollview->widget, MGUI_WIDGET_SCROLLVIEW);
scrollview->child = NULL;
scrollview->position = (mgl_vec2i){ 0, 0 };
scrollview->scroll = (mgl_vec2i){ 0, 0 };
scrollview->mouse_scroll = (mgl_vec2f){ 0.0f, 0.0f };
return scrollview;
}
void mgui_scrollview_destroy(mgui_scrollview *scrollview) {
if(scrollview->child)
mgui_widget_destroy(scrollview->child);
mgui_free(scrollview);
}
mgui_widget* mgui_scrollview_to_widget(mgui_scrollview *list) {
return &list->widget;
}
mgui_scrollview* mgui_widget_to_scrollview(mgui_widget *widget) {
assert(widget->type == MGUI_WIDGET_SCROLLVIEW);
return (mgui_scrollview*)widget;
}
void mgui_scrollview_set_child(mgui_scrollview *self, mgui_widget *child) {
assert(child != mgui_scrollview_to_widget(self));
self->child = child;
if(self->child) {
mgui_widget_set_has_parent(self->child);
mgui_widget_calculate_size(self->child, self->widget.size);
}
}
void mgui_scrollview_set_position(mgui_scrollview *self, mgl_vec2i position) {
self->position = position;
}
void mgui_scrollview_calculate_size(mgui_scrollview *self, mgl_vec2i max_size) {
self->widget.size = max_size;
if(self->widget.size.x == WIDGET_NATURAL_SIZE)
self->widget.size.x = 500;
if(self->widget.size.y == WIDGET_NATURAL_SIZE)
self->widget.size.y = 600;
if(self->child)
mgui_widget_calculate_size(self->child, (mgl_vec2i){ WIDGET_NATURAL_SIZE, WIDGET_NATURAL_SIZE });
}
void mgui_scrollview_on_event(mgui_scrollview *self, mgl_window *window, mgl_event *event) {
/* TODO: Allow keyboard navigation if scrollview has focus */
if(event->type == MGL_EVENT_MOUSE_WHEEL_SCROLLED)
self->mouse_scroll.y += (event->mouse_wheel_scroll.delta * SCROLL_ACCEL);
if(self->child)
mgui_widget_on_event(self->child, window, event);
}
/* TODO: Check if visible in scissor */
void mgui_scrollview_draw(mgui_scrollview *self, mgl_window *window) {
const double frame_time = mgui_get_seconds_since_last_update();
self->mouse_scroll.x *= max_float(0.0f, (1.0f - frame_time * SCROLL_DEACCEL));
self->mouse_scroll.y *= max_float(0.0f, (1.0f - frame_time * SCROLL_DEACCEL));
if(abs_float(self->mouse_scroll.x) < 0.0001f)
self->mouse_scroll.x = 0.0f;
if(abs_float(self->mouse_scroll.y) < 0.0001f)
self->mouse_scroll.y = 0.0f;
self->scroll.x += (int)self->mouse_scroll.x;
self->scroll.y += (int)self->mouse_scroll.y;
mgl_vec2i child_size;
if(self->child)
child_size = self->child->size;
else
child_size = (mgl_vec2i){ 0, 0 };
if(child_size.x > self->widget.size.x) {
self->scroll.x = min_int(self->scroll.x, 0);
self->scroll.x = max_int(self->scroll.x, -child_size.x + self->widget.size.x);
} else {
self->scroll.x = 0;
}
if(child_size.y > self->widget.size.y) {
self->scroll.y = min_int(self->scroll.y, 0);
self->scroll.y = max_int(self->scroll.y, -child_size.y + self->widget.size.y);
} else {
self->scroll.y = 0;
}
if(self->child) {
mgl_scissor prev_scissor;
mgl_window_get_scissor(window, &prev_scissor);
mgl_scissor new_scissor = {
.position = self->position,
.size = self->widget.size
};
mgl_window_set_scissor(window, &new_scissor);
mgui_widget_set_position(self->child, (mgl_vec2i){ self->position.x + self->scroll.x, self->position.y + self->scroll.y });
mgui_widget_draw(self->child, window);
mgl_window_set_scissor(window, &prev_scissor);
}
}
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