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#include "control.hpp"
#include <cassert>
#include "window.hpp"
namespace cru::ui {
void Control::_SetParent(Control* parent) {
const auto old_parent = GetParent();
parent_ = parent;
const auto new_parent = GetParent();
if (old_parent != new_parent) OnParentChanged(old_parent, new_parent);
}
void Control::_SetDescendantWindow(Window* window) {
if (window == nullptr && window_ == nullptr) return;
// You can only attach or detach window.
assert((window != nullptr && window_ == nullptr) ||
(window == nullptr && window_ != nullptr));
if (window == nullptr) {
const auto old = window_;
TraverseDescendants([old](Control* control) {
control->window_ = nullptr;
control->OnDetachToWindow(old);
});
} else
TraverseDescendants([window](Control* control) {
control->window_ = window;
control->OnAttachToWindow(window);
});
}
void Control::TraverseDescendants(
const std::function<void(Control*)>& predicate) {
TraverseDescendantsInternal(this, predicate);
}
void Control::TraverseDescendantsInternal(
Control* control, const std::function<void(Control*)>& predicate) {
predicate(control);
for (auto c : control->GetChildren())
TraverseDescendantsInternal(c, predicate);
}
bool Control::RequestFocus() {
auto window = GetWindow();
if (window == nullptr) return false;
return window->RequestFocusFor(this);
}
bool Control::HasFocus() {
auto window = GetWindow();
if (window == nullptr) return false;
return window->GetFocusControl() == this;
}
void Control::SetCursor(const Cursor::Ptr& cursor) {
if (cursor != cursor_) {
cursor_ = cursor;
const auto window = GetWindow();
if (window && window->GetMouseHoverControl() == this)
window->UpdateCursor();
}
}
void Control::OnParentChanged(Control* old_parent, Control* new_parent) {}
void Control::OnAttachToWindow(Window* window) {}
void Control::OnDetachToWindow(Window* window) {}
void Control::OnMouseClickBegin(MouseButton button) {}
void Control::OnMouseClickEnd(MouseButton button) {}
const std::vector<Control*> NoChildControl::empty_control_vector{};
ContentControl::ContentControl()
: child_vector_{nullptr}, child_(child_vector_[0]) {}
ContentControl::~ContentControl() { delete child_; }
void ContentControl::SetChild(Control* child) {
if (child == child_) return;
const auto window = GetWindow();
const auto old_child = child_;
child_ = child;
if (old_child) {
old_child->_SetParent(nullptr);
old_child->_SetDescendantWindow(nullptr);
}
if (child) {
child->_SetParent(this);
child->_SetDescendantWindow(window);
}
OnChildChanged(old_child, child);
}
void ContentControl::OnChildChanged(Control* old_child, Control* new_child) {}
void ControlAddChildCheck(Control* control) {
if (control->GetParent() != nullptr)
throw std::invalid_argument("The control already has a parent.");
if (dynamic_cast<Window*>(control))
throw std::invalid_argument("Can't add a window as child.");
}
Layout::~Layout() {
for (const auto child : children_) delete child;
}
void Layout::AddChild(Control* control, const int position) {
ControlAddChildCheck(control);
if (position < 0 || static_cast<decltype(children_.size())>(position) >
this->children_.size())
throw std::invalid_argument("The position is out of range.");
children_.insert(this->children_.cbegin() + position, control);
control->_SetParent(this);
control->_SetDescendantWindow(GetWindow());
OnAddChild(control, position);
}
void Layout::RemoveChild(const int position) {
if (position < 0 || static_cast<decltype(this->children_.size())>(position) >=
this->children_.size())
throw std::invalid_argument("The position is out of range.");
const auto i = children_.cbegin() + position;
const auto child = *i;
children_.erase(i);
child->_SetParent(nullptr);
child->_SetDescendantWindow(nullptr);
OnRemoveChild(child, position);
}
void Layout::OnAddChild(Control* child, int position) {}
void Layout::OnRemoveChild(Control* child, int position) {}
std::list<Control*> GetAncestorList(Control* control) {
std::list<Control*> l;
while (control != nullptr) {
l.push_front(control);
control = control->GetParent();
}
return l;
}
Control* FindLowestCommonAncestor(Control* left, Control* right) {
if (left == nullptr || right == nullptr) return nullptr;
auto&& left_list = GetAncestorList(left);
auto&& right_list = GetAncestorList(right);
// the root is different
if (left_list.front() != right_list.front()) return nullptr;
// find the last same control or the last control (one is ancestor of the
// other)
auto left_i = left_list.cbegin();
auto right_i = right_list.cbegin();
while (true) {
if (left_i == left_list.cend()) return *(--left_i);
if (right_i == right_list.cend()) return *(--right_i);
if (*left_i != *right_i) return *(--left_i);
++left_i;
++right_i;
}
}
} // namespace cru::ui
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