widget/src/qt/nsScreenManagerQt.cpp
author mats.palmgren@bredband.net
Thu, 17 May 2007 20:49:14 -0700
changeset 1585 633138510b5ae5e25a3bfe66d2db572dc361d448
parent 1 9b2a99adc05e53cd4010de512f50118594756650
permissions -rw-r--r--
Move nsIDocShellTreeItem::childOffset to nsDocShell and remove all uses except internally by nsDocShell (it should be removed eventually). b=376562 r=Olli.Pettay sr=bzbarsky

/* ***** BEGIN LICENSE BLOCK *****
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 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
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 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
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 * Contributor(s):
 *   Lars Knoll <knoll@kde.org>
 *   Zack Rusin <zack@kde.org>
 *   John C. Griggs <johng@corel.com>
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#include "nsScreenManagerQt.h"
#include "nsScreenQt.h"

#include "qdesktopwidget.h"
#include "qapplication.h"
#include "qtlog.h"

nsScreenManagerQt::nsScreenManagerQt()
{
    desktop = 0;
}


nsScreenManagerQt::~nsScreenManagerQt()
{
    // nothing to see here.
}

// addref, release, QI
NS_IMPL_ISUPPORTS1(nsScreenManagerQt, nsIScreenManager)

void nsScreenManagerQt::init()
{
    if (desktop)
        return;

    desktop = QApplication::desktop();
    nScreens = desktop->numScreens();
    screens = new nsCOMPtr<nsIScreen>[nScreens];

    for (int i = 0; i < nScreens; ++i)
        screens[i] = new nsScreenQt(i);
}

//
// 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
nsScreenManagerQt::ScreenForRect(PRInt32 inLeft, PRInt32 inTop,
				 PRInt32 inWidth, PRInt32 inHeight,
				 nsIScreen **outScreen)
{
    if (!desktop)
        init();

    QRect r(inLeft, inTop, inWidth, inHeight);
    int best = 0;
    int area = 0;
    for (int i = 0; i < nScreens; ++i) {
        const QRect& rect = desktop->screenGeometry(i);
        QRect intersection = r&rect;
        int a = intersection.width()*intersection.height();
        if (a > area) {
            best = i;
            area = a;
        }
    }
    NS_IF_ADDREF(*outScreen = screens[best]);
    return NS_OK;
}

//
// GetPrimaryScreen
//
// The screen with the menubar/taskbar. This shouldn't be needed very
// often.
//
NS_IMETHODIMP
nsScreenManagerQt::GetPrimaryScreen(nsIScreen **aPrimaryScreen)
{
    if (!desktop)
        init();

    NS_IF_ADDREF(*aPrimaryScreen = screens[0]);
    return NS_OK;
}

//
// GetNumberOfScreens
//
// Returns how many physical screens are available.
//
NS_IMETHODIMP
nsScreenManagerQt::GetNumberOfScreens(PRUint32 *aNumberOfScreens)
{
    if (!desktop)
        init();

    *aNumberOfScreens = desktop->numScreens();
    return NS_OK;
}