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Backends: Win32: Use WM_NCMOUSEMOVE / WM_NCMOUSELEAVE to track mouse positions over non-client area (OS decorations) when app is not focused. (#6045, #6162)
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@ -34,6 +34,7 @@ typedef DWORD (WINAPI *PFN_XInputGetState)(DWORD, XINPUT_STATE*);
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2023-02-15: Inputs: Use WM_NCMOUSEMOVE / WM_NCMOUSELEAVE to track mouse position over non-client area (e.g. OS decorations) when app is not focused. (#6045, #6162)
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// 2023-02-02: Inputs: Flipping WM_MOUSEHWHEEL (horizontal mouse-wheel) value to match other backends and offer consistent horizontal scrolling direction. (#4019, #6096, #1463)
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// 2022-10-11: Using 'nullptr' instead of 'NULL' as per our switch to C++11.
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// 2022-09-28: Inputs: Convert WM_CHAR values with MultiByteToWideChar() when window class was registered as MBCS (not Unicode).
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@ -84,7 +85,7 @@ struct ImGui_ImplWin32_Data
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{
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HWND hWnd;
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HWND MouseHwnd;
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bool MouseTracked;
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int MouseTrackedArea; // 0: not tracked, 1: client are, 2: non-client area
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int MouseButtonsDown;
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INT64 Time;
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INT64 TicksPerSecond;
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@ -267,7 +268,8 @@ static void ImGui_ImplWin32_UpdateMouseData()
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}
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// (Optional) Fallback to provide mouse position when focused (WM_MOUSEMOVE already provides this when hovered or captured)
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if (!io.WantSetMousePos && !bd->MouseTracked)
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// This also fills a short gap when clicking non-client area: WM_NCMOUSELEAVE -> modal OS move -> gap -> WM_NCMOUSEMOVE
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if (!io.WantSetMousePos && bd->MouseTrackedArea == 0)
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{
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POINT pos;
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if (::GetCursorPos(&pos) && ::ScreenToClient(bd->hWnd, &pos))
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@ -515,25 +517,39 @@ IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hwnd, UINT msg, WPARA
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switch (msg)
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{
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case WM_MOUSEMOVE:
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case WM_NCMOUSEMOVE:
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{
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// We need to call TrackMouseEvent in order to receive WM_MOUSELEAVE events
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const int area = (msg == WM_MOUSEMOVE) ? 1 : 2;
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bd->MouseHwnd = hwnd;
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if (!bd->MouseTracked)
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if (bd->MouseTrackedArea != area)
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{
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TRACKMOUSEEVENT tme = { sizeof(tme), TME_LEAVE, hwnd, 0 };
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::TrackMouseEvent(&tme);
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bd->MouseTracked = true;
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TRACKMOUSEEVENT tme_cancel = { sizeof(tme_cancel), TME_CANCEL, hwnd, 0 };
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TRACKMOUSEEVENT tme_track = { sizeof(tme_track), (DWORD)((area == 2) ? (TME_LEAVE | TME_NONCLIENT) : TME_LEAVE), hwnd, 0 };
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if (bd->MouseTrackedArea != 0)
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::TrackMouseEvent(&tme_cancel);
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::TrackMouseEvent(&tme_track);
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bd->MouseTrackedArea = area;
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}
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POINT mouse_pos = { (LONG)GET_X_LPARAM(lParam), (LONG)GET_Y_LPARAM(lParam) };
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if (msg == WM_NCMOUSEMOVE && ::ScreenToClient(hwnd, &mouse_pos) == FALSE) // WM_NCMOUSEMOVE are provided in absolute coordinates.
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break;
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io.AddMousePosEvent((float)mouse_pos.x, (float)mouse_pos.y);
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break;
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}
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case WM_MOUSELEAVE:
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if (bd->MouseHwnd == hwnd)
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bd->MouseHwnd = nullptr;
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bd->MouseTracked = false;
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io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
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case WM_NCMOUSELEAVE:
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{
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const int area = (msg == WM_MOUSELEAVE) ? 1 : 2;
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if (bd->MouseTrackedArea == area)
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{
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if (bd->MouseHwnd == hwnd)
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bd->MouseHwnd = nullptr;
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bd->MouseTrackedArea = 0;
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io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
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}
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break;
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}
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case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK:
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case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK:
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case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK:
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@ -35,6 +35,14 @@ HOW TO UPDATE?
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VERSION 1.89.4 WIP (In Progress)
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-----------------------------------------------------------------------
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Breaking Changes:
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Other changes:
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- Backends: Win32: Use WM_NCMOUSEMOVE / WM_NCMOUSELEAVE to track mouse positions over
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non-client area (e.g. OS decorations) when app is not focused. (#6045, #6162)
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-----------------------------------------------------------------------
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VERSION 1.89.3 (Released 2023-02-14)
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@ -50,7 +58,7 @@ Breaking Changes:
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- imgui_impl_sdl.h -> imgui_impl_sdl2.h
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- example_sdl_xxxx/ -> example_sdl2_xxxx/ (folders and projects)
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All changes:
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Other changes:
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- SeparatorText(): Added SeparatorText() widget. (#1643) [@phed, @ocornut]
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- Added to style: float SeparatorTextBorderSize.
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