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#if defined(Hiro_ComboButton)
namespace hiro {
auto pComboButton::construct() -> void {
hwnd = CreateWindow(
L"COMBOBOX", L"",
WS_CHILD | WS_TABSTOP | CBS_DROPDOWNLIST | CBS_HASSTRINGS,
0, 0, 0, 0,
_parentHandle(), nullptr, GetModuleHandle(0), 0
);
pWidget::construct();
for(auto& item : state().items) append(item);
}
auto pComboButton::destruct() -> void {
DestroyWindow(hwnd);
}
auto pComboButton::append(sComboButtonItem item) -> void {
lock();
SendMessage(hwnd, CB_ADDSTRING, 0, (LPARAM)(wchar_t*)utf16_t(item->state.text));
if(item->state.selected) SendMessage(hwnd, CB_SETCURSEL, item->offset(), 0);
if(SendMessage(hwnd, CB_GETCURSEL, 0, 0) == CB_ERR) item->setSelected();
unlock();
}
auto pComboButton::minimumSize() const -> Size {
s32 width = 0;
for(auto& item : state().items) {
width = max(width, pFont::size(hfont, item->state.text).width());
}
return {width + 24_sx, pFont::size(hfont, " ").height() + 10_sy};
}
auto pComboButton::remove(sComboButtonItem item) -> void {
lock();
SendMessage(hwnd, CB_DELETESTRING, item->offset(), 0);
if(item->state.selected) SendMessage(hwnd, CB_SETCURSEL, 0, 0);
unlock();
}
auto pComboButton::reset() -> void {
SendMessage(hwnd, CB_RESETCONTENT, 0, 0);
}
//Windows overrides the height parameter for a ComboButton's SetWindowPos to be the drop-down list height.
//the canonical way to set the actual height is through CB_SETITEMHEIGHT. However, doing so is bugged.
//the ComboButton will end up not being painted for ~500ms after calling ShowWindow(hwnd, SW_NORMAL) on it.
//thus, implementing windows that use multiple pages of controls via toggling visibility will flicker heavily.
//as a result, the best we can do is center the actual widget within the requested space.
auto pComboButton::setGeometry(Geometry geometry) -> void {
//since the ComboButton has a fixed height, it will always be the same, even before calling setGeometry() once.
RECT rc;
GetWindowRect(hwnd, &rc);
geometry.setY(geometry.y() + (geometry.height() - (rc.bottom - rc.top)));
pWidget::setGeometry({geometry.x(), geometry.y(), geometry.width(), 1});
}
auto pComboButton::onChange() -> void {
s32 offset = SendMessage(hwnd, CB_GETCURSEL, 0, 0);
if(offset == CB_ERR) return;
for(auto& item : state().items) item->state.selected = false;
if(auto item = self().item(offset)) item->setSelected();
self().doChange();
}
}
#endif
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