2006-01-11 21:28:25 +00:00
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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2006-01-11 21:27:48 +00:00
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*
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2006-01-11 21:28:40 +00:00
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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2006-01-11 21:27:48 +00:00
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*
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2006-01-11 21:28:25 +00:00
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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2006-01-11 21:27:48 +00:00
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*
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* The Original Code is mozilla.org code.
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*
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2006-01-11 21:28:40 +00:00
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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2006-01-11 21:28:25 +00:00
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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2006-01-11 21:28:40 +00:00
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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2006-01-11 21:28:25 +00:00
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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2006-01-11 21:28:40 +00:00
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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2006-01-11 21:27:48 +00:00
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#include "nsScreenManagerGtk.h"
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#include "nsScreenGtk.h"
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#include "nsIComponentManager.h"
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#include "nsRect.h"
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#include <gdk/gdkx.h>
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#ifdef MOZ_ENABLE_XINERAMA
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// this header rocks!
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extern "C"
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{
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#include <X11/extensions/Xinerama.h>
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}
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#endif /* MOZ_ENABLE_XINERAMA */
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nsScreenManagerGtk :: nsScreenManagerGtk ( )
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{
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// nothing else to do. I guess we could cache a bunch of information
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// here, but we want to ask the device at runtime in case anything
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// has changed.
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mNumScreens = 0;
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}
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nsScreenManagerGtk :: ~nsScreenManagerGtk()
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{
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// nothing to see here.
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}
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// addref, release, QI
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NS_IMPL_ISUPPORTS1(nsScreenManagerGtk, nsIScreenManager)
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// this function will make sure that everything has been initialized.
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nsresult
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nsScreenManagerGtk :: EnsureInit(void)
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{
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if (!mCachedScreenArray) {
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mCachedScreenArray = do_CreateInstance("@mozilla.org/supports-array;1");
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if (!mCachedScreenArray) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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#ifdef MOZ_ENABLE_XINERAMA
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// get the number of screens via xinerama
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XineramaScreenInfo *screenInfo;
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if (XineramaIsActive(GDK_DISPLAY())) {
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screenInfo = XineramaQueryScreens(GDK_DISPLAY(), &mNumScreens);
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}
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else {
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screenInfo = NULL;
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mNumScreens = 1;
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}
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#else
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mNumScreens = 1;
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#endif
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// there will be < 2 screens if we are either not building with
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// xinerama support or xinerama isn't running on the current
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// display.
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if (mNumScreens < 2) {
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mNumScreens = 1;
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nsCOMPtr<nsISupports> screen = new nsScreenGtk();
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if (!screen)
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return NS_ERROR_OUT_OF_MEMORY;
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mCachedScreenArray->AppendElement(screen);
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}
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// If Xinerama is enabled and there's more than one screen, fill
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// in the info for all of the screens. If that's not the case
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// then nsScreenGTK() defaults to the screen width + height
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#ifdef MOZ_ENABLE_XINERAMA
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else {
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#ifdef DEBUG
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printf("Xinerama superpowers activated for %d screens!\n", mNumScreens);
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#endif
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int i;
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for (i=0; i < mNumScreens; i++) {
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nsScreenGtk *screen = new nsScreenGtk();
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if (!screen) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// initialize this screen object
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screen->mXOrg = screenInfo[i].x_org;
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screen->mYOrg = screenInfo[i].y_org;
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screen->mWidth = screenInfo[i].width;
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screen->mHeight = screenInfo[i].height;
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screen->mScreenNum = screenInfo[i].screen_number;
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nsCOMPtr<nsISupports> screenSupports = screen;
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mCachedScreenArray->AppendElement(screenSupports);
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}
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}
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#endif /* MOZ_ENABLE_XINERAMA */
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}
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return NS_OK;;
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}
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//
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// ScreenForRect
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//
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// Returns the screen that contains the rectangle. If the rect overlaps
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// multiple screens, it picks the screen with the greatest area of intersection.
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//
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// The coordinates are in pixels (not twips) and in screen coordinates.
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//
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NS_IMETHODIMP
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nsScreenManagerGtk :: ScreenForRect ( PRInt32 aX, PRInt32 aY,
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PRInt32 aWidth, PRInt32 aHeight,
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nsIScreen **aOutScreen )
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForRect\n");
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return rv;
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}
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// which screen ( index from zero ) should we return?
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PRUint32 which = 0;
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// Optimize for the common case. If the number of screens is only
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// one then this will fall through with which == 0 and will get the
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// primary screen.
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if (mNumScreens > 1) {
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// walk the list of screens and find the one that has the most
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// surface area.
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PRUint32 count;
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mCachedScreenArray->Count(&count);
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PRUint32 i;
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PRUint32 area = 0;
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nsRect windowRect(aX, aY, aWidth, aHeight);
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for (i=0; i < count; i++) {
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PRInt32 x, y, width, height;
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x = y = width = height = 0;
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nsCOMPtr<nsIScreen> screen;
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mCachedScreenArray->GetElementAt(i, getter_AddRefs(screen));
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screen->GetRect(&x, &y, &width, &height);
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// calculate the surface area
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nsRect screenRect(x, y, width, height);
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screenRect.IntersectRect(screenRect, windowRect);
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PRUint32 tempArea = screenRect.width * screenRect.height;
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if (tempArea >= area) {
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which = i;
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area = tempArea;
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}
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}
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}
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nsCOMPtr<nsIScreen> outScreen;
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mCachedScreenArray->GetElementAt(which, getter_AddRefs(outScreen));
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*aOutScreen = outScreen.get();
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NS_IF_ADDREF(*aOutScreen);
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return NS_OK;
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} // ScreenForRect
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//
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// GetPrimaryScreen
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//
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// The screen with the menubar/taskbar. This shouldn't be needed very
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// often.
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//
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NS_IMETHODIMP
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nsScreenManagerGtk :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen)
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetPrimaryScreen\n");
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return rv;
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}
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nsCOMPtr <nsIScreen> screen;
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mCachedScreenArray->GetElementAt(0, getter_AddRefs(screen));
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*aPrimaryScreen = screen.get();
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NS_IF_ADDREF(*aPrimaryScreen);
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return NS_OK;
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} // GetPrimaryScreen
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2006-01-11 21:27:52 +00:00
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//
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// GetNumberOfScreens
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//
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// Returns how many physical screens are available.
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//
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NS_IMETHODIMP
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nsScreenManagerGtk :: GetNumberOfScreens(PRUint32 *aNumberOfScreens)
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetNumberOfScreens\n");
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return rv;
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}
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*aNumberOfScreens = mNumScreens;
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return NS_OK;
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} // GetNumberOfScreens
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