#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 { signed 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 { signed 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