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593 lines
17 KiB
593 lines
17 KiB
//---------------------------------------------------------------------------
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//
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// TrackME.C (TrackMouseEvent)
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//
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// Created by: Sankar on 1/24/96
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//
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// What:
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// This emulates the TrackMouseEvent() API for the Nashville project
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// in comctl32.dll
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//
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// How:
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// This subclasses the given window to get mouse messages and uses a
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// high frequency timer to learn about mouse leaves.
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//
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//---------------------------------------------------------------------------
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#include "ctlspriv.h"
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#ifdef TrackMouseEvent
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#undef TrackMouseEvent
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#endif
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extern const TCHAR FAR c_szTMEdata[];
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extern DWORD g_dwHoverSelectTimeout;
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#define ID_MOUSEHOVER 0xFFFFFFF0L
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#define ID_MOUSELEAVE 0xFFFFFFF1L
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#define TME_MOUSELEAVE_TIME (GetDoubleClickTime() / 5)
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#define IsKeyDown(Key) (GetKeyState(Key) & 0x8000)
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// This is the structure whose pointer gets added as a property of a window
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// being tracked.
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typedef struct tagTMEDATA {
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TRACKMOUSEEVENT TrackMouseEvent;
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RECT rcMouseHover; //In screen co-ordinates.
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} TMEDATA, FAR *LPTMEDATA;
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void NEAR TME_ResetMouseHover(LPTRACKMOUSEEVENT lpTME, LPTMEDATA lpTMEdata);
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LRESULT CALLBACK TME_SubclassProc(HWND hwnd, UINT message, WPARAM wParam,
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LPARAM lParam, UINT_PTR uIdSubclass, ULONG_PTR dwRefData);
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LPTMEDATA NEAR GetTMEdata(HWND hwnd)
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{
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LPTMEDATA lpTMEdata;
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GetWindowSubclass(hwnd, TME_SubclassProc, 0, (ULONG_PTR *)&lpTMEdata);
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return lpTMEdata;
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}
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void NEAR TME_PostMouseLeave(HWND hwnd)
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{
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PostMessage(hwnd, WM_MOUSELEAVE, 0, 0L);
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}
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void NEAR TME_CancelMouseLeave(LPTMEDATA lpTMEdata)
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{
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if(!(lpTMEdata->TrackMouseEvent.dwFlags & TME_LEAVE))
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return;
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// Remove the flag.
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lpTMEdata->TrackMouseEvent.dwFlags &= ~(TME_LEAVE);
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// We leave the timer set here since our hover implementation uses it too.
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// TME_CancelTracking will kill it later.
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}
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void NEAR TME_CancelMouseHover(LPTMEDATA lpTMEdata)
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{
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if(!(lpTMEdata->TrackMouseEvent.dwFlags & TME_HOVER))
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return;
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lpTMEdata->TrackMouseEvent.dwFlags &= ~(TME_HOVER);
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KillTimer(lpTMEdata->TrackMouseEvent.hwndTrack, ID_MOUSEHOVER);
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}
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void NEAR TME_CancelTracking(LPTMEDATA lpTMEdata)
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{
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HWND hwndTrack;
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//If either MouseLeave or MouseHover is ON, don't cancel tracking.
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if(lpTMEdata->TrackMouseEvent.dwFlags & (TME_HOVER | TME_LEAVE))
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return;
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hwndTrack = lpTMEdata->TrackMouseEvent.hwndTrack;
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// Uninstall our subclass callback.
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RemoveWindowSubclass(hwndTrack, TME_SubclassProc, 0);
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// Kill the mouseleave timer.
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KillTimer(hwndTrack, ID_MOUSELEAVE);
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// Free the tracking data.
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LocalFree((HANDLE)lpTMEdata);
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}
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void NEAR TME_RemoveAllTracking(LPTMEDATA lpTMEdata)
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{
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TME_CancelMouseLeave(lpTMEdata);
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TME_CancelMouseHover(lpTMEdata);
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TME_CancelTracking(lpTMEdata);
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}
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//---------------------------------------------------------------------------
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//
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// TME_MouseHasLeft()
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// The mouse has left the region being tracked. Send the MOUSELEAVE msg
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// and then cancel all tracking.
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//
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//---------------------------------------------------------------------------
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void NEAR TME_MouseHasLeft(LPTMEDATA lpTMEdata)
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{
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DWORD dwFlags;
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//Is WM_MOUSELEAVE notification requied?
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if((dwFlags = lpTMEdata->TrackMouseEvent.dwFlags) & TME_LEAVE)
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TME_PostMouseLeave(lpTMEdata->TrackMouseEvent.hwndTrack); //Then, do it!
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// Cancel all the tracking since the mouse has left.
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TME_RemoveAllTracking(lpTMEdata);
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}
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// --------------------------------------------------------------------------
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//
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// TME_SubclassWndProc()
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//
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// The subclass proc used for TrackMouseEvent()...!
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//
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// --------------------------------------------------------------------------
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LRESULT CALLBACK TME_SubclassProc(HWND hwnd, UINT message, WPARAM wParam,
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LPARAM lParam, UINT_PTR uIdSubclass, ULONG_PTR dwRefData)
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{
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LPTMEDATA lpTMEdata = (LPTMEDATA)dwRefData;
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ASSERT(lpTMEdata);
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switch(message)
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{
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case WM_DESTROY:
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case WM_NCDESTROY:
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TME_RemoveAllTracking(lpTMEdata);
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break;
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case WM_ENTERMENULOOP:
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// If the window being tracked enters menu mode, then we need to
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// act asif the mouse has left.
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// NOTE: Because when we are in menu mode, the SCREEN_CAPTURE has occurred
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// and we don't see any mouse moves. This is the only way out!
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// Post mouse leave and cancel all tracking!
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TME_MouseHasLeft(lpTMEdata);
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break;
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case WM_LBUTTONDOWN:
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case WM_LBUTTONUP:
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case WM_MBUTTONDOWN:
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case WM_MBUTTONUP:
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case WM_RBUTTONDOWN:
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case WM_RBUTTONUP:
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case WM_NCLBUTTONDOWN:
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case WM_NCLBUTTONUP:
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case WM_NCMBUTTONDOWN:
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case WM_NCMBUTTONUP:
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case WM_NCRBUTTONDOWN:
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case WM_NCRBUTTONUP:
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//Whenever there is a mouse click, reset mouse hover.
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if(lpTMEdata->TrackMouseEvent.dwFlags & TME_HOVER)
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TME_ResetMouseHover(&(lpTMEdata->TrackMouseEvent), lpTMEdata);
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break;
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case WM_NCMOUSEMOVE:
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TME_MouseHasLeft(lpTMEdata);
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break;
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case WM_MOUSEMOVE:
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{
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POINT Pt;
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Pt.x = GET_X_LPARAM(lParam);
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Pt.y = GET_Y_LPARAM(lParam);
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ClientToScreen(hwnd, &Pt);
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//Check if the mouse is within the hover rect.
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if((lpTMEdata->TrackMouseEvent.dwFlags & TME_HOVER) &&
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!PtInRect(&(lpTMEdata->rcMouseHover), Pt))
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TME_ResetMouseHover(&(lpTMEdata->TrackMouseEvent), lpTMEdata);
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}
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break;
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}
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return DefSubclassProc(hwnd, message, wParam, lParam);
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}
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// --------------------------------------------------------------------------
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//
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// TME_CheckInWindow()
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//
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// This get the current cursor position and checks if it still lies in the
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// "valid" area.
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// Returns TRUE, if it lies in the valid area.
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// FALSE, otherwise.
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//
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// --------------------------------------------------------------------------
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BOOL NEAR TME_CheckInWindow(LPTRACKMOUSEEVENT lpTME, LPPOINT lpPt)
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{
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POINT pt;
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HWND hwnd; // Given window.
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HWND hwndPt; //Window from the given point.
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HWND hwndCapture;
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hwnd = lpTME->hwndTrack; //Given window handle.
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//See if anyone has captured the mouse input.
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if((hwndCapture = GetCapture()) && IsWindow(hwndCapture))
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{
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// If tracking is required for a window other than the one that
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// has the capture, forget it! It is not possible!
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if(hwndCapture != hwnd)
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return(FALSE);
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}
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GetCursorPos(&pt); //Get cursor point in screen co-ordinates.
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if (!hwndCapture)
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{
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hwndPt = WindowFromPoint(pt);
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if (!hwndPt || !IsWindow(hwndPt) || (hwnd != hwndPt))
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return FALSE;
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if (SendMessage(hwnd, WM_NCHITTEST, 0,
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MAKELPARAM((SHORT)pt.x, (SHORT)pt.y)) != HTCLIENT)
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{
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return FALSE;
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}
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}
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// The current point falls on the same area of the same window.
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// It is a valid location.
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if (lpPt)
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*lpPt = pt;
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return(TRUE);
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}
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// --------------------------------------------------------------------------
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// TME_MouseLeaveTimer()
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//
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// Timer callback for WM_MOUSELEAVE generation and cancelling HOVER!
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//
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// --------------------------------------------------------------------------
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VOID CALLBACK TME_MouseLeaveTimer(HWND hwnd, UINT msg, UINT_PTR id, DWORD dwTime)
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{
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LPTMEDATA lpTMEdata;
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if(!(lpTMEdata = GetTMEdata(hwnd)))
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return;
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// YIELD!!!
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if(TME_CheckInWindow(&(lpTMEdata->TrackMouseEvent), NULL))
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return; //The mouse is still in the valid region. So, do nothing.
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if (!IsWindow(hwnd))
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return;
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//The mouse has left the valid region. So, post mouse-leave if requested
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//Because we are cancelling mouse-leave, we need to cancel mouse-hover too!
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// There can be no hover tracking, if the mouse has already left!
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TME_MouseHasLeft(lpTMEdata);
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}
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WPARAM NEAR GetMouseKeyFlags()
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{
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WPARAM wParam = 0;
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if (IsKeyDown(VK_LBUTTON))
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wParam |= MK_LBUTTON;
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if (IsKeyDown(VK_RBUTTON))
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wParam |= MK_RBUTTON;
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if (IsKeyDown(VK_MBUTTON))
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wParam |= MK_MBUTTON;
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if (IsKeyDown(VK_SHIFT))
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wParam |= MK_SHIFT;
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if (IsKeyDown(VK_CONTROL))
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wParam |= MK_CONTROL;
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return wParam;
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}
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// --------------------------------------------------------------------------
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// TME_MouseHoverTimer()
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//
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// Timer callback for WM_MOUSEHOVER/WM_NCMOUSEHOVER generation.
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//
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// --------------------------------------------------------------------------
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VOID CALLBACK TME_MouseHoverTimer(HWND hwnd, UINT msg, UINT_PTR id, DWORD dwTime)
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{
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POINT pt;
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WPARAM wParam;
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LPTMEDATA lpTMEdata;
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if (!(lpTMEdata = GetTMEdata(hwnd)))
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return;
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//BOGUS: we can not detect hwndSysModal from here!
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//Also, tracking is for a per-window basis now!
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//
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// BOGUS: We don't have to worry about JournalPlayback?
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//pt = fJournalPlayback? Lpq(hwnd->hq)->ptLast : ptTrueCursor;
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// YIELD!!!
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if(!TME_CheckInWindow(&(lpTMEdata->TrackMouseEvent), &pt))
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{
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// Mouse has left the valid region of the window. So, cancel all
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// the tracking.
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TME_MouseHasLeft(lpTMEdata);
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return;
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}
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if (!IsWindow(hwnd))
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return;
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if (!PtInRect(&(lpTMEdata->rcMouseHover), pt))
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{
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// Mouse has gone out of the hover rectangle. Reset the hovering.
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TME_ResetMouseHover(&(lpTMEdata->TrackMouseEvent), lpTMEdata);
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return;
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}
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//
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// set up to check the tolerance and
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//
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wParam = GetMouseKeyFlags();
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ScreenToClient(hwnd, &pt);
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//Mouse is still within the hover rectangle. Let's post hover msg
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PostMessage(hwnd, WM_MOUSEHOVER, wParam, MAKELPARAM(pt.x, pt.y));
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//And then cancel the hovering.
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TME_CancelMouseHover(lpTMEdata);
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TME_CancelTracking(lpTMEdata); //Cancel the tracking, if needed.
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}
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BOOL NEAR TME_SubclassWnd(LPTMEDATA lpTMEdata)
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{
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BOOL fResult;
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fResult = SetWindowSubclass(lpTMEdata->TrackMouseEvent.hwndTrack,
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TME_SubclassProc, 0, (ULONG_PTR)lpTMEdata);
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ASSERT(fResult);
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return fResult;
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}
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void NEAR TME_ResetMouseLeave(LPTRACKMOUSEEVENT lpTME, LPTMEDATA lpTMEdata)
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{
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//See if already MouseLeave is being tracked.
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if(lpTMEdata->TrackMouseEvent.dwFlags & TME_LEAVE)
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return; // Nothing else to do.
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//Else, set the flag.
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lpTMEdata ->TrackMouseEvent.dwFlags |= TME_LEAVE;
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//Set the high frequency Timer.
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SetTimer(lpTME->hwndTrack, ID_MOUSELEAVE, TME_MOUSELEAVE_TIME, TME_MouseLeaveTimer);
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}
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void NEAR TME_ResetMouseHover(LPTRACKMOUSEEVENT lpTME, LPTMEDATA lpTMEdata)
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{
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DWORD dwMouseHoverTime;
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POINT pt;
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// Even if the hover tracking is already happening, the caller might
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// change the timer value, restart the timer or change the hover
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// rectangle.
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lpTMEdata->TrackMouseEvent.dwFlags |= TME_HOVER;
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dwMouseHoverTime = lpTME->dwHoverTime;
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if (!dwMouseHoverTime || (dwMouseHoverTime == HOVER_DEFAULT))
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dwMouseHoverTime = (g_dwHoverSelectTimeout ? g_dwHoverSelectTimeout : GetDoubleClickTime()*4/5); // BUGBUG: Can't we remember this?
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GetCursorPos(&pt);
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//
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// update the tolerance rectangle for the hover window.
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//
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*((POINT *)&(lpTMEdata->rcMouseHover.left)) = *((POINT *)&(lpTMEdata->rcMouseHover.right)) = pt;
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//BOGUS: Can we use globals to remeber these metrics. What about NT?
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InflateRect(&(lpTMEdata->rcMouseHover), g_cxDoubleClk/2, g_cyDoubleClk/2);
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// We need to remember the timer interval we are setting. This value
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// needs to be returned when TME_QUERY is used.
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lpTME->dwHoverTime = dwMouseHoverTime;
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lpTMEdata->TrackMouseEvent.dwHoverTime = dwMouseHoverTime;
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SetTimer(lpTME->hwndTrack, ID_MOUSEHOVER, dwMouseHoverTime, TME_MouseHoverTimer);
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}
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// --------------------------------------------------------------------------
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// QueryTrackMouseEvent()
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//
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// Fills in a TRACKMOUSEEVENT structure describing current tracking state
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// for a given window. The given window is in lpTME->hwndTrack.
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//
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// --------------------------------------------------------------------------
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BOOL NEAR QueryTrackMouseEvent(LPTRACKMOUSEEVENT lpTME)
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{
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HWND hwndTrack;
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LPTMEDATA lpTMEdata;
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//
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// if there isn't anything being tracked get out
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//
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if((!(hwndTrack = lpTME->hwndTrack)) || !IsWindow(hwndTrack))
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goto Sorry;
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if(!(lpTMEdata = GetTMEdata(hwndTrack)))
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goto Sorry;
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if(!(lpTMEdata->TrackMouseEvent.dwFlags & (TME_HOVER | TME_LEAVE)))
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goto Sorry;
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//
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// fill in the requested information
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//
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lpTME->dwFlags = lpTMEdata->TrackMouseEvent.dwFlags;
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if (lpTMEdata->TrackMouseEvent.dwFlags & TME_HOVER)
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lpTME->dwHoverTime = lpTMEdata->TrackMouseEvent.dwHoverTime;
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else
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lpTME->dwHoverTime = 0;
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goto Done;
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Sorry:
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// zero out the struct
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lpTME->dwFlags = 0;
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lpTME->hwndTrack = NULL;
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lpTME->dwHoverTime = 0;
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Done:
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return TRUE;
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}
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// --------------------------------------------------------------------------
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// EmulateTrackMouseEvent()
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//
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// emulate API for requesting extended mouse notifications (hover, leave...)
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//
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// --------------------------------------------------------------------------
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BOOL WINAPI EmulateTrackMouseEvent(LPTRACKMOUSEEVENT lpTME)
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{
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HWND hwnd;
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DWORD dwFlags;
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LPTMEDATA lpTMEdata;
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if (lpTME->dwFlags & ~TME_VALID)
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return FALSE;
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#ifdef TME_NONCLIENT
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//
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// this implementation does not handle TME_NONCLIENT (anymore)
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// we agreed with the NT team to rip it out until the system uses it...
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//
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if (lpTME->dwFlags & TME_NONCLIENT)
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return FALSE;
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#endif
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//
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// implement queries separately
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//
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if (lpTME->dwFlags & TME_QUERY)
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return QueryTrackMouseEvent(lpTME);
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//
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// Check the validity of the request.
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//
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hwnd = lpTME->hwndTrack;
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dwFlags = lpTME->dwFlags;
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if (!IsWindow(hwnd))
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return FALSE;
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// Check if the mouse is currently in a valid position
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// Use GetCursorPos() to get the mouse position and then check if
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// it lies within the client/non-client portion of the window as
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// defined in this call;
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// YIELD!!!
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if(!TME_CheckInWindow(lpTME, NULL))
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{
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//If the mouse leave is requested when the mouse is already outside
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// the window, then generate one mouse leave immly.
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if((dwFlags & TME_LEAVE) && !(dwFlags & TME_CANCEL))
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TME_PostMouseLeave(hwnd);
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//Because it is an invalid request, we return immly.
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return(TRUE);
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}
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if (!IsWindow(hwnd))
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return FALSE;
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//It is a valid request, either to install or remove tracking.
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//See if we already have tracking for this window.
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if(!(lpTMEdata = GetTMEdata(hwnd)))
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{
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//We are not tracking this window already.
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if(dwFlags & TME_CANCEL)
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return(TRUE); //There is nothing to cancel; Ignore!
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//Do they want any tracking at all?
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ASSERT(dwFlags & (TME_HOVER | TME_LEAVE));
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//Allocate global mem to remember the tracking data
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if(!(lpTMEdata = (LPTMEDATA)LocalAlloc(LPTR, sizeof(TMEDATA))))
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return(FALSE);
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// copy in the hwnd
|
|
lpTMEdata->TrackMouseEvent.hwndTrack = lpTME->hwndTrack;
|
|
|
|
// Make sure our subclass callback is installed.
|
|
if (!TME_SubclassWnd(lpTMEdata))
|
|
{
|
|
TME_CancelTracking(lpTMEdata);
|
|
return(FALSE);
|
|
}
|
|
}
|
|
|
|
//Else fall through!
|
|
|
|
if(dwFlags & TME_CANCEL)
|
|
{
|
|
if(dwFlags & TME_HOVER)
|
|
TME_CancelMouseHover(lpTMEdata);
|
|
|
|
if(dwFlags & TME_LEAVE)
|
|
TME_CancelMouseLeave(lpTMEdata);
|
|
|
|
// If both hover and leave are cancelled, then we don't need any
|
|
// tracking.
|
|
TME_CancelTracking(lpTMEdata);
|
|
|
|
return(TRUE); // Cancelled whatever they asked for.
|
|
}
|
|
|
|
if(dwFlags & TME_HOVER)
|
|
TME_ResetMouseHover(lpTME, lpTMEdata);
|
|
|
|
if(dwFlags & TME_LEAVE)
|
|
TME_ResetMouseLeave(lpTME, lpTMEdata);
|
|
|
|
return(TRUE);
|
|
}
|
|
|
|
typedef BOOL (WINAPI* PFNTME)(LPTRACKMOUSEEVENT);
|
|
|
|
PFNTME g_pfnTME = NULL;
|
|
|
|
// --------------------------------------------------------------------------
|
|
// _TrackMouseEvent() entrypoint
|
|
//
|
|
// calls TrackMouseEvent if present, otherwise uses EmulateTrackMouseEvent
|
|
//
|
|
// --------------------------------------------------------------------------
|
|
BOOL WINAPI _TrackMouseEvent(LPTRACKMOUSEEVENT lpTME)
|
|
{
|
|
if (!g_pfnTME)
|
|
{
|
|
HMODULE hmod = GetModuleHandle(TEXT("USER32"));
|
|
|
|
if (hmod)
|
|
g_pfnTME = (PFNTME)GetProcAddress(hmod, "TrackMouseEvent");
|
|
|
|
if (!g_pfnTME)
|
|
g_pfnTME = EmulateTrackMouseEvent;
|
|
}
|
|
|
|
return g_pfnTME(lpTME);
|
|
}
|
|
|