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#include "GUIListBox.hpp"
#include <godot_cpp/classes/input_event_mouse_button.hpp>
#include <godot_cpp/variant/utility_functions.hpp>
#include "openvic-extension/utility/ClassBindings.hpp"
#include "openvic-extension/utility/UITools.hpp"
#include "openvic-extension/utility/Utilities.hpp"
using namespace OpenVic;
using namespace godot;
using OpenVic::Utilities::std_view_to_godot_string;
Error GUIListBox::_calculate_child_arrangement() {
ERR_FAIL_NULL_V(gui_listbox, FAILED);
const int32_t child_count = get_child_count();
const real_t max_height = get_size().height;
real_t height = 0.0f, height_under_max_scroll_index = 0.0f;
children_data.clear();
max_scroll_index = 0;
for (int32_t index = 0; index < child_count; ++index) {
Control* child = Object::cast_to<Control>(get_child(index));
if (child != nullptr && child != scrollbar && child->is_visible()) {
const real_t child_height = child->get_size().height; /* Spacing is ignored */
children_data.push_back({ child, height, child_height });
height += child_height;
height_under_max_scroll_index += child_height;
while (height_under_max_scroll_index > max_height && max_scroll_index + 1 < children_data.size()) {
height_under_max_scroll_index -= children_data[max_scroll_index++].height;
}
}
}
ERR_FAIL_NULL_V(scrollbar, FAILED);
scrollbar->set_limits(0, max_scroll_index, false);
scrollbar->emit_value_changed();
scrollbar->set_visible(max_scroll_index > 0);
return OK;
}
Error GUIListBox::_update_child_positions() {
ERR_FAIL_NULL_V(gui_listbox, FAILED);
if (children_data.empty()) {
return OK;
}
const real_t max_height = get_size().height;
const real_t scroll_pos = children_data[scroll_index].start_pos;
for (int32_t index = 0; index < children_data.size(); ++index) {
child_data_t const& data = children_data[index];
if (index < scroll_index || data.start_pos + data.height > scroll_pos + max_height) {
data.child->set_position({ 0.0f, max_height + 10.0f });
} else {
data.child->set_position({ 0.0f, data.start_pos - scroll_pos });
}
}
return OK;
}
void GUIListBox::_bind_methods() {
OV_BIND_METHOD(GUIListBox::clear);
OV_BIND_METHOD(GUIListBox::clear_children);
OV_BIND_METHOD(GUIListBox::get_scroll_index);
OV_BIND_METHOD(GUIListBox::set_scroll_index, { "new_scroll_index" });
OV_BIND_METHOD(GUIListBox::get_max_scroll_index);
OV_BIND_METHOD(GUIListBox::get_gui_listbox_name);
OV_BIND_METHOD(GUIListBox::get_scrollbar);
}
void GUIListBox::_notification(int what) {
switch (what) {
case NOTIFICATION_SORT_CHILDREN: {
_calculate_child_arrangement();
} break;
}
}
GUIListBox::GUIListBox()
: gui_listbox { nullptr }, scrollbar { nullptr }, children_data {}, scroll_index { 0 }, max_scroll_index { 0 } {
set_clip_contents(true);
}
Vector2 GUIListBox::_get_minimum_size() const {
if (gui_listbox != nullptr) {
Size2 size = Utilities::to_godot_fvec2(gui_listbox->get_size());
if (scrollbar != nullptr) {
size.width += scrollbar->get_minimum_size().width;
}
return size;
} else {
return {};
}
}
void GUIListBox::_gui_input(godot::Ref<godot::InputEvent> const& event) {
ERR_FAIL_NULL(event);
Ref<InputEventMouseButton> mb = event;
if (mb.is_valid()) {
if (mb->is_pressed()) {
if (mb->get_button_index() == MouseButton::MOUSE_BUTTON_WHEEL_UP) {
set_scroll_index(scroll_index - 1);
} else if (mb->get_button_index() == MouseButton::MOUSE_BUTTON_WHEEL_DOWN) {
set_scroll_index(scroll_index + 1);
} else {
return;
}
accept_event();
}
}
}
void GUIListBox::clear() {
gui_listbox = nullptr;
children_data.clear();
scroll_index = 0;
max_scroll_index = 0;
clear_children();
if (scrollbar != nullptr) {
remove_child(scrollbar);
scrollbar = nullptr;
}
}
void GUIListBox::clear_children() {
int32_t child_count = get_child_count();
while (child_count > 0) {
Node* child = get_child(--child_count);
if (child != scrollbar) {
remove_child(child);
}
}
if (scrollbar != nullptr) {
scrollbar->set_value(0);
}
}
void GUIListBox::set_scroll_index(int32_t new_scroll_index) {
scroll_index = std::clamp(new_scroll_index, 0, max_scroll_index);
if (scrollbar != nullptr && scrollbar->get_value() != scroll_index) {
scrollbar->set_value(scroll_index, false);
}
_update_child_positions();
}
Error GUIListBox::set_gui_listbox(GUI::ListBox const* new_gui_listbox) {
if (gui_listbox == new_gui_listbox) {
return OK;
}
if (new_gui_listbox == nullptr) {
clear();
return OK;
}
gui_listbox = new_gui_listbox;
const String scrollbar_name = std_view_to_godot_string(gui_listbox->get_scrollbar_name());
Error err = OK;
if (scrollbar_name.is_empty()) {
UtilityFunctions::push_error("GUIListBox ", get_name(), " has no scrollbar name!");
err = FAILED;
scrollbar = nullptr;
} else {
static const String scrollbar_scene = "core";
Control* scrollbar_control = nullptr;
if (!UITools::generate_gui_element(scrollbar_scene, scrollbar_name, "", scrollbar_control)) {
UtilityFunctions::push_error("Error generating scrollbar ", scrollbar_name, " for GUIListBox ", get_name());
err = FAILED;
}
if (scrollbar_control != nullptr) {
scrollbar = Object::cast_to<GUIScrollbar>(scrollbar_control);
if (scrollbar != nullptr) {
add_child(scrollbar);
const Size2 size = Utilities::to_godot_fvec2(gui_listbox->get_size());
scrollbar->set_position({ size.width, 0.0f });
scrollbar->set_length_override(size.height);
static const StringName set_scroll_index_func_name = "set_scroll_index";
scrollbar->connect(
GUIScrollbar::signal_value_changed(), Callable { this, set_scroll_index_func_name }, CONNECT_PERSIST
);
} else {
UtilityFunctions::push_error(
"Element ", scrollbar_name, " for GUIListBox ", get_name(), " is not a GUIScrollbar"
);
err = FAILED;
}
} else {
scrollbar = nullptr;
}
}
return err;
}
String GUIListBox::get_gui_listbox_name() const {
return gui_listbox != nullptr ? std_view_to_godot_string(gui_listbox->get_name()) : String {};
}
GUIScrollbar* GUIListBox::get_scrollbar() const {
return scrollbar;
}
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