jcomponent.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 82 行

/* class JComponent
 *
 * Copyright (C) 2001  R M Pitman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package charvax.swing;

import charva.awt.Component;
import charva.awt.Insets;
import charva.awt.Point;
import charvax.swing.border.Border;

/**
 * The base class for charva.swing components. JComponent provides a 
 * border property that implicitly defines the component's insets.
 * Note that JComponent is a subclass of Component, not of Container
 * (whereas java.swing.JComponent is a subclass of java.awt.Container).
 */
public abstract class JComponent
    extends Component
{
    public JComponent() {
    }

    public void setBorder(Border border_) {
	_border = border_;
    }

    public Border getBorder() { return _border; }

    public Insets getInsets() { 
	if (_border != null) {
	    return _border.getBorderInsets(this);
	}
	else
	    return new Insets(0,0,0,0);
    }


    /**
     * Draws the border of the component (if there is one).
     */
    public void draw() {
	Point origin = getLocationOnScreen();

//	int colorpair = getCursesColor();

	/* Blank out the area of this component, but only if this
	 * component's color-pair is different than that of the
	 * parent container.
	Container parent = getParent();
	if (parent != null && colorpair != parent.getCursesColor())
	    Toolkit.getDefaultToolkit().blankBox(origin, this.getSize(), colorpair);
	 */

	if (_border != null) {
	    _border.paintBorder(this, 0,
		    origin.x, origin.y,
		    this.getWidth(), this.getHeight());
	}
    }

    //====================================================================
    // INSTANCE VARIABLES

    protected Border _border = null;
}