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/* Copyright (C) 2000  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the

Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for

details.  */

package gnu.gcj.xlib;

import gnu.gcj.RawData;

/**

 * A flyweight class that denotes an X11 screen.  Display and screen

 * number is the only data kept by this class.  The real screen

 * structure is stored in the display.  There may exist several

 * objects denoting the same screen.

 *

 * @author Rolf W. Rasmussen <rolfwr@ii.uib.no>

 */

public final class Screen

{

  static final int UNKNOWN = -1;

  Display display;

  int screenNumber = UNKNOWN;

  RawData structure;

  Screen(Display display, RawData screenStructure)

  {

    structure = screenStructure;

    this.display = display;

  }

  public Screen(Display display)

  {

    this(display, display.getDefaultScreenNumber());

  }

  public Screen(Display display, int screenNumber)

  {

    this.display = display;

    this.screenNumber = screenNumber;

    initStructure();

  }

  public final Display getDisplay()

  {

    return display;

  }

  public Window getRootWindow()

  {

    int rootXID = getRootWindowXID();

    return display.getWindow(rootXID);

  }

  public Visual getRootVisual()

  {

    RawData visualStructure = getRootVisualStructure();

    int depth = getRootDepth();

    return new Visual(visualStructure, this, depth);

  }

  private native RawData getRootVisualStructure();

  public native int getRootDepth();

  public native int getRootWindowXID();

  public native int getDefaultColormapXID();

  native void initStructure();

  public Colormap getDefaultColormap()

  {

    return new Colormap(this, getDefaultColormapXID());

  }

  public final int getScreenNumber()

  {

    if (screenNumber == UNKNOWN)

      screenNumber = findScreenNumber();

    return screenNumber;

  }

  public native int findScreenNumber();

}