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// Headless check of the preferences dialog resource inside the built component.
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//
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// prefs_layout_check <path to foo_input_joc.dll>
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//
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// The page's appearance cannot be inspected on this machine (windows created from
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// an agent shell are not on an enumerable desktop), but every property that makes
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// a page look or behave wrong *is* measurable:
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//
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// * a WS_CAPTION / WS_BORDER on an embedded page draws a second frame inside the
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// host's own frame -- that is the "two nested pages" look;
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// * a control whose centre does not hit-test to itself cannot be clicked, and
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// WindowFromPoint says which window is swallowing the click (usually a group
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// box declared after it, or the host's clip region when the control sits
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// outside the dialog's client area);
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// * controls outside the dialog's client rectangle are invisible or cut off;
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// * disabled controls are reported so "I can see it but cannot change it" can be
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// told apart from "it is covered".
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//
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// It creates the dialog from the resource exactly as the component does, inside a
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// host window, and prints one line per control.
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#include <windows.h>
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#include <cstdio>
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#include <string>
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#include <vector>
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namespace {
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struct Control {
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HWND window = nullptr;
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int id = 0;
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std::string window_class;
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std::string text;
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bool top_level = false; // direct child of the dialog
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};
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std::string narrow(const wchar_t* text) {
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if (text == nullptr || *text == L'\0') return {};
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const int needed =
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WideCharToMultiByte(CP_UTF8, 0, text, -1, nullptr, 0, nullptr, nullptr);
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std::string out(static_cast<std::size_t>(needed), '\0');
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WideCharToMultiByte(CP_UTF8, 0, text, -1, out.data(), needed, nullptr, nullptr);
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if (!out.empty() && out.back() == '\0') out.pop_back();
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return out;
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}
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std::string class_of(HWND window) {
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wchar_t buffer[256] = {};
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GetClassNameW(window, buffer, 255);
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return narrow(buffer);
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}
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std::string text_of(HWND window) {
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const int length = GetWindowTextLengthW(window);
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if (length <= 0) return {};
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std::wstring buffer(static_cast<std::size_t>(length) + 1, L'\0');
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GetWindowTextW(window, buffer.data(), length + 1);
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buffer.resize(static_cast<std::size_t>(length));
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return narrow(buffer.c_str());
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}
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BOOL CALLBACK collect(HWND window, LPARAM param) {
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auto* controls = reinterpret_cast<std::vector<Control>*>(param);
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Control control;
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control.window = window;
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control.id = GetDlgCtrlID(window);
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control.window_class = class_of(window);
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control.text = text_of(window);
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controls->push_back(control);
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return TRUE;
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}
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INT_PTR CALLBACK page_proc(HWND, UINT, WPARAM, LPARAM) { return FALSE; }
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HWND create_host() {
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static const wchar_t* kClass = L"joc_prefs_host";
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WNDCLASSEXW wc{};
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wc.cbSize = sizeof(wc);
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wc.lpfnWndProc = DefWindowProcW;
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wc.hInstance = GetModuleHandleW(nullptr);
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wc.lpszClassName = kClass;
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RegisterClassExW(&wc);
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return CreateWindowExW(0, kClass, L"host", WS_OVERLAPPEDWINDOW, 0, 0, 640, 480, nullptr,
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nullptr, wc.hInstance, nullptr);
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}
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bool is_descendant(HWND candidate, HWND ancestor) {
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for (HWND walk = candidate; walk != nullptr; walk = GetParent(walk)) {
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if (walk == ancestor) return true;
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}
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return false;
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}
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// A control the user can operate: static text and group boxes answer WM_NCHITTEST
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// with HTTRANSPARENT, so a real click passes straight through them.
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bool is_interactive(HWND window) {
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const std::string window_class = class_of(window);
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if (window_class == "Edit" || window_class == "ComboBox") return true;
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if (window_class != "Button") return false;
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const LONG_PTR style = GetWindowLongPtrW(window, GWL_STYLE);
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return (style & BS_GROUPBOX) == 0;
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}
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// True when another interactive sibling sits above the control at that point --
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// that, and only that, is what stops a click from reaching it. The walk goes
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// from the top of the z-order downwards (GW_CHILD / GW_HWNDNEXT), which is the
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// order Windows itself hit-tests in.
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bool covered_by_sibling(HWND dialog, HWND control, POINT centre) {
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for (HWND walk = GetWindow(dialog, GW_CHILD); walk != nullptr;
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walk = GetWindow(walk, GW_HWNDNEXT)) {
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if (walk == control) return false; // reached it: nothing above is in the way
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if (!is_interactive(walk) || IsWindowVisible(walk) == FALSE) continue;
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RECT rect{};
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GetWindowRect(walk, &rect);
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POINT top_left{rect.left, rect.top};
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POINT bottom_right{rect.right, rect.bottom};
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ScreenToClient(dialog, &top_left);
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ScreenToClient(dialog, &bottom_right);
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if (centre.x >= top_left.x && centre.x < bottom_right.x && centre.y >= top_left.y &&
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centre.y < bottom_right.y) {
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return true;
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}
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}
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return false;
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}
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} // namespace
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int main(int argc, char** argv) {
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if (argc < 2) {
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std::fprintf(stderr, "usage: prefs_layout_check <foo_input_joc.dll>\n");
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return 2;
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}
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const std::wstring dll_path = [&] {
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const int needed = MultiByteToWideChar(CP_UTF8, 0, argv[1], -1, nullptr, 0);
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std::wstring out(static_cast<std::size_t>(needed), L'\0');
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MultiByteToWideChar(CP_UTF8, 0, argv[1], -1, out.data(), needed);
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if (!out.empty() && out.back() == L'\0') out.pop_back();
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return out;
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}();
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HMODULE module = LoadLibraryExW(dll_path.c_str(), nullptr, LOAD_WITH_ALTERED_SEARCH_PATH);
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if (module == nullptr) {
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std::fprintf(stderr, "cannot load %s (error %lu)\n", argv[1], GetLastError());
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return 1;
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}
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HWND host = create_host();
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HWND dialog = CreateDialogParamW(module, MAKEINTRESOURCEW(2001), host, page_proc, 0);
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if (dialog == nullptr) {
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std::fprintf(stderr, "CreateDialogParamW failed (error %lu)\n", GetLastError());
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return 1;
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}
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ShowWindow(host, SW_SHOW);
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ShowWindow(dialog, SW_SHOW);
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UpdateWindow(dialog);
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const LONG_PTR style = GetWindowLongPtrW(dialog, GWL_STYLE);
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RECT window_rect{};
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RECT client_rect{};
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GetWindowRect(dialog, &window_rect);
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GetClientRect(dialog, &client_rect);
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const int border_x = static_cast<int>((window_rect.right - window_rect.left) -
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(client_rect.right - client_rect.left));
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const int border_y = static_cast<int>((window_rect.bottom - window_rect.top) -
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(client_rect.bottom - client_rect.top));
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std::printf("dialog 0x%p client=%ldx%ld non-client=%dx%d\n", static_cast<void*>(dialog),
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client_rect.right, client_rect.bottom, border_x, border_y);
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std::printf(" WS_CAPTION=%s WS_BORDER=%s WS_CHILD=%s WS_VISIBLE=%s WS_TABSTOP=%s\n",
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(style & WS_CAPTION) ? "yes" : "no", (style & WS_BORDER) ? "yes" : "no",
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(style & WS_CHILD) ? "yes" : "no", (style & WS_VISIBLE) ? "yes" : "no",
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(style & WS_TABSTOP) ? "yes" : "no");
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if ((style & WS_CAPTION) != 0) {
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std::printf(" NOTE: a caption on an embedded page is the second frame the host "
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"already draws\n");
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}
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std::vector<Control> controls;
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EnumChildWindows(dialog, collect, reinterpret_cast<LPARAM>(&controls));
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std::printf("\n%-28s %-22s %-8s %-7s %-9s %-16s %s\n", "text", "class", "id", "enabled",
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"inside", "hit-test", "covered by");
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int problems = 0;
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LONG max_x = 0;
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LONG max_y = 0;
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for (const Control& control : controls) {
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RECT rect{};
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GetWindowRect(control.window, &rect);
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POINT top_left{rect.left, rect.top};
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POINT bottom_right{rect.right, rect.bottom};
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ScreenToClient(dialog, &top_left);
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ScreenToClient(dialog, &bottom_right);
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if (bottom_right.x > max_x) max_x = bottom_right.x;
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if (bottom_right.y > max_y) max_y = bottom_right.y;
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const bool inside = top_left.x >= 0 && top_left.y >= 0 &&
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bottom_right.x <= client_rect.right &&
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bottom_right.y <= client_rect.bottom;
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const bool enabled = IsWindowEnabled(control.window) != FALSE;
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// Hit-test the way Windows does for a real click: a static or a group box
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// in the way is transparent, another interactive control is not.
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POINT centre{(top_left.x + bottom_right.x) / 2, (top_left.y + bottom_right.y) / 2};
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const bool blocked = covered_by_sibling(dialog, control.window, centre);
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const bool hits_self = !blocked;
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std::string covered = blocked ? std::string("another control") : std::string();
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// Only controls the user is meant to operate count as problems: static
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// text and group boxes are transparent to the mouse by design.
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const LONG_PTR control_style = GetWindowLongPtrW(control.window, GWL_STYLE);
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const bool is_group_box =
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control.window_class == "Button" && (control_style & BS_GROUPBOX) != 0;
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const bool is_label = control.window_class == "Static" && !is_group_box;
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const bool interactive = !is_group_box && !is_label;
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const bool bad = interactive && (!enabled || !inside || !hits_self);
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if (bad) ++problems;
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std::printf("%-28s %-22s %-8d %-7s %-9s %-16s %s%s\n",
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control.text.empty() ? "(no text)" : control.text.c_str(),
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control.window_class.c_str(), control.id, enabled ? "yes" : "NO",
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inside ? "yes" : "NO", hits_self ? "self" : "OTHER", covered.c_str(),
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bad ? " <== PROBLEM" : (interactive ? "" : " (label)"));
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}
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std::printf("\ncontent extent=%ldx%ld client=%ldx%ld %s\n", max_x, max_y,
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client_rect.right, client_rect.bottom,
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(max_x <= client_rect.right && max_y <= client_rect.bottom)
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? "(everything fits)"
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: "(CONTENT IS CLIPPED)");
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std::printf("controls=%zu problems=%d\n", controls.size(), problems);
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return problems == 0 ? 0 : 1;
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}
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Reference in New Issue
Block a user