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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();
}
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