A simple, small calculator placed discreetly near the Windows Taskbar or anywhere on the screen
feat: show caption and close button only while calculator window is active
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
authored by
Marco Maroni
Claude Fable 5
and committed by
Tangled
(Jul 15, 2026, 1:16 PM +0300)
a2bbb5fb
0e900bbf
+42
+38
CalculatorWindow.cpp
+38
CalculatorWindow.cpp
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return 0;
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}
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LRESULT CCalculatorWindow::OnActivate(UINT, WPARAM wParam, LPARAM, BOOL& bHandled)
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{
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// Caption + close button only while the window is active.
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ApplyFrameStyle(LOWORD(wParam) != WA_INACTIVE);
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bHandled = FALSE; // let default activation processing run too
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return 0;
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}
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void CCalculatorWindow::ApplyFrameStyle(bool visible)
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{
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if (visible == m_captionVisible)
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return;
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m_captionVisible = visible;
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// The client rect must not move on screen: capture it before the style change.
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RECT rc; GetClientRect(&rc);
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::MapWindowPoints(m_hWnd, NULL, (LPPOINT)&rc, 2);
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LONG_PTR style = GetWindowLongPtr(GWL_STYLE);
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if (visible)
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style |= (WS_CAPTION | WS_SYSMENU);
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else
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style &= ~(WS_CAPTION | WS_SYSMENU);
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SetWindowLongPtr(GWL_STYLE, style);
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RECT r = rc;
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AdjustWindowRectEx(&r, (DWORD)style, FALSE,
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(DWORD)GetWindowLongPtr(GWL_EXSTYLE));
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// Guard: never push the top edge above the work area.
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RECT work; SystemParametersInfo(SPI_GETWORKAREA, 0, &work, 0);
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if (r.top < work.top)
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::OffsetRect(&r, 0, work.top - r.top);
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SetWindowPos(NULL, r.left, r.top, r.right - r.left, r.bottom - r.top,
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SWP_FRAMECHANGED | SWP_NOZORDER | SWP_NOACTIVATE);
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}
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void CCalculatorWindow::Paint(HDC hdc, const RECT& rcPaint) const
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{
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m_ptrVisualStyle->DrawBackground(m_hWnd, hdc, rcPaint);
+4
CalculatorWindow.h
+4
CalculatorWindow.h
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MESSAGE_HANDLER(WM_CLOSE, OnClose)
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MESSAGE_HANDLER(WM_LBUTTONDOWN, OnLButtonDown)
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MESSAGE_HANDLER(WM_EXITSIZEMOVE, OnExitSizeMove)
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MESSAGE_HANDLER(WM_ACTIVATE, OnActivate)
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END_MSG_MAP()
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// Handler prototypes:
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LRESULT OnClose(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
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LRESULT OnLButtonDown(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
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LRESULT OnExitSizeMove(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
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LRESULT OnActivate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled);
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void Paint(HDC hdc, const RECT& rcPaint) const;
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// UINT_PTR SetUpdateTimer();
···
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BOOL m_fHasFocus;
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bool m_shown = false;
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CAutoPtr<CVisualStyle> m_ptrVisualStyle;
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void ApplyFrameStyle(bool visible);
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bool m_captionVisible = true; // window is created with WS_CAPTION | WS_SYSMENU
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//const DateFormat* m_pDateFormat;
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//SYSTEMTIME m_stLocalTime;