A simple, small calculator placed discreetly near the Windows Taskbar or anywhere on the screen
feat: tray icon, owner window, single-instance guard, About/Exit
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
authored by
Marco Maroni
Claude Opus 4.8 (1M context)
and committed by
Tangled
(Jul 15, 2026, 1:16 PM +0300)
a2360d0f
3e555ba0
+188
-3
+30
AboutDialog.cpp
+30
AboutDialog.cpp
···
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#include "stdafx.h"
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#include <commctrl.h>
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INT_PTR CALLBACK AboutDialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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switch (uMsg) {
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case WM_INITDIALOG:
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return TRUE;
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case WM_NOTIFY:
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switch (((LPNMHDR)lParam)->code) {
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case NM_CLICK:
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case NM_RETURN: {
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PNMLINK p = (PNMLINK)lParam;
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if (p->item.iLink == 0)
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ShellExecuteW(NULL, L"open", p->item.szUrl, NULL, NULL, SW_SHOW);
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break;
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}
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}
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break;
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case WM_COMMAND:
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switch (LOWORD(wParam)) {
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case IDOK:
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case IDCANCEL:
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EndDialog(hwndDlg, TRUE);
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return TRUE;
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}
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break;
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}
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return FALSE;
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}
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-3
App.cpp
+93
-3
App.cpp
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#include "stdafx.h"
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#include <commctrl.h>
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#include <winrt/Windows.Foundation.h>
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#include "TrayIcon.h"
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#include "StartupManager.h"
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#include "resource.h"
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int WINAPI wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int)
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enum { IDM_SHOWHIDE = 1, IDM_STARTUP = 2, IDM_ABOUT = 3, IDM_EXIT = 4 };
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static const UINT WM_TRAY_CALLBACK = WM_APP + 1;
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static const UINT TRAY_ICON_ID = 1;
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UINT g_wmTaskbarCreated = 0;
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static TrayIcon g_tray;
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INT_PTR CALLBACK AboutDialogProc(HWND, UINT, WPARAM, LPARAM); // AboutDialog.cpp
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// Placeholder until Task 10 introduces the calculator window.
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static void ToggleCalculator() { /* wired in Task 10 */ }
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static LRESULT CALLBACK OwnerWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
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{
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MessageBox(NULL, L"Taskbar Calculator (stub)", L"TaskbarCalculator", MB_OK);
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return 0;
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if (msg == g_wmTaskbarCreated) { // Explorer restarted
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g_tray.Add(hWnd, WM_TRAY_CALLBACK, TRAY_ICON_ID, L"Taskbar Calculator");
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return 0;
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}
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switch (msg) {
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case WM_TRAY_CALLBACK:
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if (LOWORD(lParam) == WM_LBUTTONUP) {
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ToggleCalculator();
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} else if (LOWORD(lParam) == WM_RBUTTONUP) {
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Startup::State s = Startup::Get();
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g_tray.ShowContextMenu(hWnd, s == Startup::State::Enabled,
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s != Startup::State::Unavailable);
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}
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return 0;
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case WM_COMMAND:
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switch (LOWORD(wParam)) {
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case IDM_SHOWHIDE: ToggleCalculator(); return 0;
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case IDM_STARTUP: {
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Startup::State s = Startup::Get();
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if (s != Startup::State::Unavailable)
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Startup::Set(s != Startup::State::Enabled);
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return 0;
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}
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case IDM_ABOUT:
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DialogBoxW(GetModuleHandleW(NULL),
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MAKEINTRESOURCE(IDD_ABOUT), hWnd, AboutDialogProc);
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return 0;
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case IDM_EXIT:
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DestroyWindow(hWnd);
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return 0;
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}
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return 0;
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case WM_DESTROY:
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g_tray.Remove();
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PostQuitMessage(0);
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return 0;
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}
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return DefWindowProc(hWnd, msg, wParam, lParam);
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}
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int WINAPI wWinMain(HINSTANCE hInst, HINSTANCE, LPWSTR, int)
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{
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// Single instance: a second launch signals the first and exits.
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HANDLE mutex = CreateMutexW(nullptr, TRUE, L"TaskbarCalculator_SingleInstance");
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if (GetLastError() == ERROR_ALREADY_EXISTS) {
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HWND existing = FindWindowW(L"TaskbarCalculatorOwner", nullptr);
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if (existing) PostMessageW(existing, WM_COMMAND, IDM_SHOWHIDE, 0);
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return 0;
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}
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winrt::init_apartment(winrt::apartment_type::single_threaded);
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INITCOMMONCONTROLSEX icc{ sizeof(icc), ICC_LINK_CLASS | ICC_STANDARD_CLASSES };
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InitCommonControlsEx(&icc);
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g_wmTaskbarCreated = RegisterWindowMessageW(L"TaskbarCreated");
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WNDCLASSW wc{};
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wc.lpfnWndProc = OwnerWndProc;
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wc.hInstance = hInst;
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wc.lpszClassName = L"TaskbarCalculatorOwner";
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RegisterClassW(&wc);
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HWND owner = CreateWindowW(wc.lpszClassName, L"", 0, 0, 0, 0, 0,
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HWND_MESSAGE, nullptr, hInst, nullptr);
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g_tray.Add(owner, WM_TRAY_CALLBACK, TRAY_ICON_ID, L"Taskbar Calculator");
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MSG m;
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while (GetMessage(&m, nullptr, 0, 0)) {
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TranslateMessage(&m);
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DispatchMessage(&m);
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}
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if (mutex) { ReleaseMutex(mutex); CloseHandle(mutex); }
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return (int)m.wParam;
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}
+3
TaskbarCalculator.vcxproj
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TaskbarCalculator.vcxproj
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</ItemDefinitionGroup>
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<ItemGroup>
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<ClCompile Include="App.cpp" />
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<ClCompile Include="AboutDialog.cpp" />
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<ClCompile Include="TrayIcon.cpp" />
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<ClCompile Include="Calculator.cpp">
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<PrecompiledHeader>NotUsing</PrecompiledHeader>
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</ClCompile>
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<ClInclude Include="CalculatorWindow.h" />
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<ClInclude Include="Settings.h" />
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<ClInclude Include="StartupManager.h" />
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<ClInclude Include="TrayIcon.h" />
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<ClInclude Include="resource.h" />
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<ClInclude Include="stdafx.h" />
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<ClInclude Include="targetver.h" />
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TaskbarCalculator.vcxproj.filters
+3
TaskbarCalculator.vcxproj.filters
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</ItemGroup>
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<ItemGroup>
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<ClCompile Include="App.cpp"><Filter>Source Files</Filter></ClCompile>
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<ClCompile Include="AboutDialog.cpp"><Filter>Source Files</Filter></ClCompile>
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<ClCompile Include="TrayIcon.cpp"><Filter>Source Files</Filter></ClCompile>
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<ClCompile Include="Calculator.cpp"><Filter>Source Files</Filter></ClCompile>
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<ClCompile Include="Settings.cpp"><Filter>Source Files</Filter></ClCompile>
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<ClCompile Include="StartupManager.cpp"><Filter>Source Files</Filter></ClCompile>
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<ClInclude Include="Calculator.h"><Filter>Header Files</Filter></ClInclude>
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<ClInclude Include="Settings.h"><Filter>Header Files</Filter></ClInclude>
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<ClInclude Include="StartupManager.h"><Filter>Header Files</Filter></ClInclude>
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<ClInclude Include="TrayIcon.h"><Filter>Header Files</Filter></ClInclude>
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<ClInclude Include="CalculatorWindow.h"><Filter>Header Files</Filter></ClInclude>
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<ClInclude Include="resource.h"><Filter>Header Files</Filter></ClInclude>
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<ClInclude Include="stdafx.h"><Filter>Header Files</Filter></ClInclude>
+42
TrayIcon.cpp
+42
TrayIcon.cpp
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#include "stdafx.h"
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#include "TrayIcon.h"
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#include "resource.h"
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// Menu command ids (kept in sync with App.cpp).
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enum { IDM_SHOWHIDE = 1, IDM_STARTUP = 2, IDM_ABOUT = 3, IDM_EXIT = 4 };
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bool TrayIcon::Add(HWND owner, UINT cbMsg, UINT iconId, const wchar_t* tip) {
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m_nid = {};
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m_nid.cbSize = sizeof(m_nid);
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m_nid.hWnd = owner;
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m_nid.uID = iconId;
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m_nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
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m_nid.uCallbackMessage = cbMsg;
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m_nid.hIcon = (HICON)LoadImage(GetModuleHandleW(NULL),
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MAKEINTRESOURCE(IDI_ICON1), IMAGE_ICON,
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GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON), 0);
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lstrcpynW(m_nid.szTip, tip, ARRAYSIZE(m_nid.szTip));
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m_added = Shell_NotifyIconW(NIM_ADD, &m_nid) != FALSE;
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return m_added;
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}
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void TrayIcon::Remove() {
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if (m_added) { Shell_NotifyIconW(NIM_DELETE, &m_nid); m_added = false; }
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if (m_nid.hIcon) { DestroyIcon(m_nid.hIcon); m_nid.hIcon = nullptr; }
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}
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void TrayIcon::ShowContextMenu(HWND owner, bool startupChecked, bool startupAvailable) {
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HMENU menu = CreatePopupMenu();
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AppendMenuW(menu, MF_STRING, IDM_SHOWHIDE, L"Show / Hide");
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AppendMenuW(menu, MF_STRING | (startupChecked ? MF_CHECKED : 0)
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| (startupAvailable ? 0 : MF_GRAYED),
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IDM_STARTUP, L"Start at login");
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AppendMenuW(menu, MF_SEPARATOR, 0, nullptr);
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AppendMenuW(menu, MF_STRING, IDM_ABOUT, L"About");
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AppendMenuW(menu, MF_STRING, IDM_EXIT, L"Exit");
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POINT pt; GetCursorPos(&pt);
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SetForegroundWindow(owner); // so the menu dismisses correctly
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TrackPopupMenu(menu, TPM_RIGHTBUTTON, pt.x, pt.y, 0, owner, nullptr);
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DestroyMenu(menu);
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}
+13
TrayIcon.h
+13
TrayIcon.h
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#pragma once
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#include <windows.h>
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#include <shellapi.h>
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class TrayIcon {
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public:
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bool Add(HWND owner, UINT cbMsg, UINT iconId, const wchar_t* tip);
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void Remove();
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void ShowContextMenu(HWND owner, bool startupChecked, bool startupAvailable);
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private:
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NOTIFYICONDATAW m_nid{};
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bool m_added = false;
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};
+4
stdafx.h
+4
stdafx.h
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#include <VsSym32.h>
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#pragma comment(lib, "UxTheme.lib")
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// Common controls (tray, SysLink in About dialog)
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#include <CommCtrl.h>
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#pragma comment(lib, "comctl32.lib")
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// ATL definitions and header files
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#define _ATL_APARTMENT_THREADED
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#define _ATL_NO_AUTOMATIC_NAMESPACE