layoutmanager.java

J2ME上的一个播放器,可以更换皮肤.开源软件.

// LayoutManager is Panel holders and manager for pane layouts

package inline.ui.lo;

import inline.ui.*;
import inline.sys.*;
import inline.ui.ce.*;
import java.util.*;

public class LayoutManager extends Vector
{
    private final static int LAYOUT_MANAGER_MARGIN = 1;
    private boolean layoutdone;
    
    public LayoutManager()
    {
    }
    
    public Panel addPane(int aalign)
    {
	Panel pane = new Panel(aalign);
	addElement(pane);
	
	return pane;
    }

    public void layout(int w, int h)
    {
	// ok, lets do it
	// what we have?
	// 1) size of new parent canvas - width and height
	// 2) number of panes to layout
	// 
	// plan to do:
	// 1) go over each pane and ask to size it, get its new width and height

	int ww = w;
	int wh = h;
	int wx = 0;
	int wy = 0;
	
	for(int i=0;i<this.size();i++)
	{
	    Panel pane = (Panel)this.elementAt(i);
	    if (pane!=null)
	    {
		if (ww==0 && wh==0)
		{
		    Log.fire("Can't layout, no more free space");
		    break;
		}
		pane.layout(wx,wy,ww,wh);
		if (pane.isHorizontal())
		{
		    int dh = pane.getHeight() + LAYOUT_MANAGER_MARGIN;
		    wh = wh - dh;
		    if (pane.getAlign() == Panel.ALIGN_TOP) 
		    {
			wy = wy + dh;
		    }
		}
		if (pane.isVertical())
		{
		    int dw = pane.getWidth() + LAYOUT_MANAGER_MARGIN;
		    ww = ww - dw;
		    if (pane.getAlign() == Panel.ALIGN_LEFT)
		    {
			wx = wx + dw;
		    }
		}
	    }
	}
	layoutdone = true;
    }
    
    public boolean isLayoutPerformed()
    {
	return layoutdone;
    }
}