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#include "layout_base.h"
#include "application.h"
#include "control.h"
#include "window.h"
namespace cru::ui
{
LayoutManager* LayoutManager::GetInstance()
{
static LayoutManager layout_manager;
return &layout_manager;
}
void LayoutManager::InvalidateControlPositionCache(Control * control)
{
if (cache_invalid_controls_.count(control) == 1)
return;
// find descendant then erase it; find ancestor then just return.
auto i = cache_invalid_controls_.cbegin();
while (i != cache_invalid_controls_.cend())
{
auto current_i = i++;
const auto result = IsAncestorOrDescendant(*current_i, control);
if (result == control)
cache_invalid_controls_.erase(current_i);
else if (result != nullptr)
return; // find a ancestor of "control", just return
}
cache_invalid_controls_.insert(control);
if (cache_invalid_controls_.size() == 1) // when insert just now and not repeat to "InvokeLater".
{
InvokeLater([this] {
for (const auto i : cache_invalid_controls_)
RefreshControlPositionCache(i);
for (const auto i : cache_invalid_controls_) // traverse all descendants of position-invalid controls and notify position change event
i->TraverseDescendants([](Control* control)
{
control->CheckAndNotifyPositionChanged();
});
cache_invalid_controls_.clear(); // after update and notify, clear the set.
});
}
}
void LayoutManager::RefreshInvalidControlPositionCache()
{
for (const auto i : cache_invalid_controls_)
RefreshControlPositionCache(i);
cache_invalid_controls_.clear();
}
void LayoutManager::RefreshControlPositionCache(Control * control)
{
auto point = Point::Zero();
auto parent = control;
while ((parent = parent->GetParent())) {
const auto p = parent->GetPositionRelative();
point.x += p.x;
point.y += p.y;
}
RefreshControlPositionCacheInternal(control, point);
}
void LayoutManager::InvalidateWindowLayout(Window* window)
{
layout_invalid_windows_.insert(window);
if (layout_invalid_windows_.size() == 1)
InvokeLater([this]()
{
this->RefreshInvalidWindowLayout();
});
}
void LayoutManager::RefreshInvalidWindowLayout()
{
for (const auto window : layout_invalid_windows_)
window->Relayout();
layout_invalid_windows_.clear();
}
void LayoutManager::RefreshControlPositionCacheInternal(Control * control, const Point & parent_lefttop_absolute)
{
const auto position = control->GetPositionRelative();
Point lefttop(
parent_lefttop_absolute.x + position.x,
parent_lefttop_absolute.y + position.y
);
control->position_cache_.lefttop_position_absolute = lefttop;
control->ForeachChild([lefttop](Control* c) {
RefreshControlPositionCacheInternal(c, lefttop);
});
}
}
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