pjs/widget/windows/nsScreenManagerWin.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* The Original Code is mozilla.org code.
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*
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#include "nsScreenManagerWin.h"
#include "nsScreenWin.h"
BOOL CALLBACK CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioCount ) ;
nsScreenManagerWin :: nsScreenManagerWin ( )
: mNumberOfScreens(0)
{
// nothing to do. I guess we could cache a bunch of information
// here, but we want to ask the device at runtime in case anything
// has changed.
}
nsScreenManagerWin :: ~nsScreenManagerWin()
{
}
// addref, release, QI
NS_IMPL_ISUPPORTS1(nsScreenManagerWin, nsIScreenManager)
//
// CreateNewScreenObject
//
// Utility routine. Creates a new screen object from the given device handle
//
// NOTE: For this "single-monitor" impl, we just always return the cached primary
// screen. This should change when a multi-monitor impl is done.
//
nsIScreen*
nsScreenManagerWin :: CreateNewScreenObject ( HMONITOR inScreen )
{
nsIScreen* retScreen = nsnull;
// look through our screen list, hoping to find it. If it's not there,
// add it and return the new one.
for ( unsigned i = 0; i < mScreenList.Length(); ++i ) {
ScreenListItem& curr = mScreenList[i];
if ( inScreen == curr.mMon ) {
NS_IF_ADDREF(retScreen = curr.mScreen.get());
return retScreen;
}
} // for each screen.
retScreen = new nsScreenWin(inScreen);
mScreenList.AppendElement ( ScreenListItem ( inScreen, retScreen ) );
NS_IF_ADDREF(retScreen);
return retScreen;
}
//
// ScreenForRect
//
// Returns the screen that contains the rectangle. If the rect overlaps
// multiple screens, it picks the screen with the greatest area of intersection.
//
// The coordinates are in pixels (not twips) and in screen coordinates.
//
NS_IMETHODIMP
nsScreenManagerWin :: ScreenForRect ( PRInt32 inLeft, PRInt32 inTop, PRInt32 inWidth, PRInt32 inHeight,
nsIScreen **outScreen )
{
if ( !(inWidth || inHeight) ) {
NS_WARNING ( "trying to find screen for sizeless window, using primary monitor" );
*outScreen = CreateNewScreenObject ( nsnull ); // addrefs
return NS_OK;
}
RECT globalWindowBounds = { inLeft, inTop, inLeft + inWidth, inTop + inHeight };
HMONITOR genScreen = ::MonitorFromRect( &globalWindowBounds, MONITOR_DEFAULTTOPRIMARY );
*outScreen = CreateNewScreenObject ( genScreen ); // addrefs
return NS_OK;
} // ScreenForRect
//
// GetPrimaryScreen
//
// The screen with the menubar/taskbar. This shouldn't be needed very
// often.
//
NS_IMETHODIMP
nsScreenManagerWin :: GetPrimaryScreen(nsIScreen** aPrimaryScreen)
{
*aPrimaryScreen = CreateNewScreenObject ( nsnull ); // addrefs
return NS_OK;
} // GetPrimaryScreen
//
// CountMonitors
//
// Will be called once for every monitor in the system. Just
// increments the parameter, which holds a ptr to a PRUin32 holding the
// count up to this point.
//
BOOL CALLBACK
CountMonitors ( HMONITOR, HDC, LPRECT, LPARAM ioParam )
{
PRUint32* countPtr = reinterpret_cast<PRUint32*>(ioParam);
++(*countPtr);
return TRUE; // continue the enumeration
} // CountMonitors
//
// GetNumberOfScreens
//
// Returns how many physical screens are available.
//
NS_IMETHODIMP
nsScreenManagerWin :: GetNumberOfScreens(PRUint32 *aNumberOfScreens)
{
if ( mNumberOfScreens )
*aNumberOfScreens = mNumberOfScreens;
else {
PRUint32 count = 0;
BOOL result = ::EnumDisplayMonitors(nsnull, nsnull, (MONITORENUMPROC)CountMonitors, (LPARAM)&count);
if (!result)
return NS_ERROR_FAILURE;
*aNumberOfScreens = mNumberOfScreens = count;
}
return NS_OK;
} // GetNumberOfScreens
NS_IMETHODIMP
nsScreenManagerWin :: ScreenForNativeWidget(void *aWidget, nsIScreen **outScreen)
{
HMONITOR mon = MonitorFromWindow ((HWND) aWidget, MONITOR_DEFAULTTOPRIMARY);
*outScreen = CreateNewScreenObject (mon);
return NS_OK;
}