Soluction for JDesktopPan

From:
"liglezias" <liglezias@THRWHITE.remove-dii-this>
Newsgroups:
comp.lang.java.gui
Date:
Wed, 27 Apr 2011 15:31:30 GMT
Message-ID:
<1173106852.830737.109680@q40g2000cwq.googlegroups.com>
  To: comp.lang.java.gui
1) Put a JDesktopPane inside a JScrollPane.
2) Set the JDesktopPane's DesktopManager property with this class:
MDIDesktopManager.
     myMDIDeskMan=new MDIDesktopManager();
     myDeskPane.setDesktopManager(myMDIDeskMan);
3) (optional) set optional's parameters
      myMDIDeskMan.setTranslacaoSuave(true); //changes in active
window will scroll slowly to the new active window
      myMDIDeskMan.setVelocidadeTranslacao(18); //scroll velocity in
an active window change

import java.awt.Dimension;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.HashMap;
import java.util.Map;

import javax.swing.DefaultDesktopManager;
import javax.swing.JComponent;
import javax.swing.JDesktopPane;
import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.JViewport;

/**
 * Classe para sobrescrever o DefaultDesktopManager para os {@link
JDesktopPane},
 * dando a ele a capacidade de ajuste no scroll (redimensiona o
preferedSize de acordo,
 * para que um {@link JScrollPane} controle sua =E1rea).
 * Al=E9m disto, o Manager se preocupa em ajustar o scroll de modo que a
janela ativa
 * fique completamente vis=EDvel (dentro do poss=EDvel) na viewport do
scrollpane.
 * @author iglezias
 */
public class MDIDesktopManager extends DefaultDesktopManager {
    public static final long serialVersionUID = 1;

    private Map<JDesktopPane,JInternalFrame> lastFrame = new
HashMap<JDesktopPane,JInternalFrame>(2);

    private boolean translacaoSuave=true;
    private int velocidadeTranslacao=25;

    public MDIDesktopManager() {
        super();
    }

    /**
     * @see #setTranslacaoSuave(boolean)
     * @return
     */
    public boolean isTranslacaoSuave() {
        return translacaoSuave;
    }
    /**
     * Se true, eventuais translacoes da view para focalizar
completamente o
     * InternalFrame atual ser=E3o suaves (n=E3o instant=E2neas)
     * @param translacaoSuave
     */
    public void setTranslacaoSuave(boolean translacaoSuave) {
        this.translacaoSuave = translacaoSuave;
    }

    /**
     * @see #setVelocidadeTranslacao(int)
     * @return
     */
    public int getVelocidadeTranslacao() {
        return velocidadeTranslacao;
    }
    /**
     * Caso {@link #isTranslacaoSuave()}, define a velocidade com que
esta translacao se dar=E1.
     * @param velocidadeTranslacao
     */
    public void setVelocidadeTranslacao(int velocidadeTranslacao) {
        this.velocidadeTranslacao = velocidadeTranslacao;
    }

    @Override
    public void endResizingFrame(JComponent f) {
        super.endResizingFrame(f);
        resizeDesktop(f);
    }

    @Override
    public void endDraggingFrame(final JComponent f) {
        super.endDraggingFrame(f);
        resizeDesktop(f);
    }

    @Override
    public void maximizeFrame(JInternalFrame f) {
        super.maximizeFrame(f);
        resizeDesktop(f);
    }

    @Override
    public void minimizeFrame(JInternalFrame f) {
        super.minimizeFrame(f);
        resizeDesktop(f);
    }

    @Override
    public void activateFrame(JInternalFrame f) {
        super.activateFrame(f);
        lastFrame.put(getDesktopPaneForFrame(f), f);
        resizeDesktop(f);
    }

    @Override
    public void closeFrame(JInternalFrame f) {
        super.closeFrame(f);
        lastFrame.put(getDesktopPaneForFrame(f), null);
        resizeDesktop(f);
    }

    public JScrollPane getScrollPane(JDesktopPane desktop) {
        if (desktop!=null && desktop.getParent() instanceof
JViewport) {
            JViewport viewPort = (JViewport) desktop.getParent();
            if (viewPort.getParent() instanceof JScrollPane)
                return (JScrollPane) viewPort.getParent();
        }
        return null;
    }

    public JDesktopPane getDesktopPaneForFrame(JComponent frame) {
        JDesktopPane result=null;
        if (frame.getParent()!=null && (frame.getParent() instanceof
JDesktopPane) ) {
            result=(JDesktopPane) frame.getParent();
        }
// Component c=frame;
// while (result==null && (c=c.getParent())!=null ) {
// if (c instanceof JDesktopPane) {
// result = (JDesktopPane) c;
// }
// }
        return result;
    }

    protected void resizeDesktop(JComponent f) {
        JDesktopPane desktop = this.getDesktopPaneForFrame(f);
        JScrollPane scrollPane = getScrollPane(desktop);
        if (scrollPane == null) return;

        scrollPane.invalidate();

        JInternalFrame ultFrame = lastFrame.get(desktop);

        if (ultFrame != null && ultFrame.isMaximum()) {
            desktop.setPreferredSize(null);
        } else {
            { //descobre janelas com x ou y negativos...
                int xMenor = Integer.MAX_VALUE, yMenor =
Integer.MAX_VALUE;
// boolean haJanelasCroped=false;
// Rectangle visibleRect =
scrollPane.getViewport().getViewRect();
                for (JInternalFrame frm : desktop.getAllFrames()) {
                    if (frm.isMaximum()) continue;
                    if (frm.getX() < xMenor) {
                        xMenor = frm.getX();
                    }
                    if (frm.getY() < yMenor) {
                        yMenor = frm.getY();
                    }
// if (!visibleRect.contains(frm.getBounds())) {
// haJanelasCroped=true;
// }
                }
                if (xMenor<0 || yMenor<0 /*|| haJanelasCroped*/)
{ //normaliza todas janelas para ter x e y maior q zero
                    for (JInternalFrame frm : desktop.getAllFrames())
{
                        if (frm.isMaximum()) continue;
                        Point pos=new Point(frm.getLocation());
                        pos.translate( (xMenor<0)?-xMenor:0 ,
(yMenor<0)?-yMenor:0 );
                        frm.setLocation(pos);
                    }
                }
            }
            int larguraCerta = 0, alturaCerta = 0;
            for (JInternalFrame frm : desktop.getAllFrames()) {
                if (frm.isMaximum()) continue;
                if (frm.getX() + frm.getWidth() > larguraCerta) {
                    larguraCerta = frm.getX() + frm.getWidth();
                }
                if (frm.getY() + frm.getHeight() > alturaCerta) {
                    alturaCerta = frm.getY() + frm.getHeight();
                }
            }
            desktop.setPreferredSize(new Dimension(larguraCerta,
alturaCerta));
        }

        scrollPane.validate();

        { //Se janela nao tiver completamente visivel, mexe no scroll
do viewport para que
            //fique completamente visivel...
            if (ultFrame!=null && !ultFrame.isMaximum()) {
                Rectangle visibleRect =
scrollPane.getViewport().getViewRect();
                Rectangle frmBounds = ultFrame.getBounds();
                if (!visibleRect.contains(frmBounds)) {
                    int deslocX=0, deslocY=0;
// Rectangle intersec =
visibleRect.intersection(this.ultFrame.getBounds());
                    if (frmBounds.x < visibleRect.x) {
                        //ViewX deve ter deslocamento para esquerda
(<0)
                        deslocX = frmBounds.x-visibleRect.x;

                    } else if ((frmBounds.x+frmBounds.width) >
(visibleRect.x+visibleRect.width) ) {
                        //ViewX deve ter deslocamento para direita
(>0)
                        deslocX = (frmBounds.x+
Math.min(frmBounds.width,visibleRect.width) )
                        - (visibleRect.x+visibleRect.width);

                    }
                    if (frmBounds.y < visibleRect.y) {
                        //ViewY deve ter deslocamento para Cima (<0)
                        deslocY = frmBounds.y-visibleRect.y;

                    } else if ((frmBounds.y+frmBounds.height) >
(visibleRect.y+visibleRect.height) ) {
                        //ViewY deve ter deslocamento para Baixo (>0)
                        deslocY = (frmBounds.y
+Math.min(frmBounds.height,visibleRect.height) )
                        - (visibleRect.y+visibleRect.height);

                    }

                    if (!this.translacaoSuave) {
                        Point
posicaoView=scrollPane.getViewport().getViewPosition();
                        posicaoView.translate(deslocX,
deslocY);
 
scrollPane.getViewport().setViewPosition(posicaoView);
                    } else {
                        //Faz deslocamento na view, de forma
progressiva...
// SwingUtilities.invokeLater(
// new
ThreadDeslocaView(scrollPane.getViewport(), deslocX, deslocY,
velocidadeTranslacao)
// );
                        new Thread(
                                new
ThreadDeslocaView(scrollPane.getViewport(), deslocX, deslocY,
velocidadeTranslacao)
                        ).run();
                    }
                }
            }
        }

        if (ultFrame!=null) {
            ultFrame.repaint();
        }
    }
}

class ThreadDeslocaView implements Runnable {
    private final int dXIni, dYIni;
    private final JViewport view;
    private final int velocidade;
    public ThreadDeslocaView(JViewport viewport, int dx, int dy, int
velocidade) {
        this.view = viewport;
        this.dXIni = dx;
        this.dYIni = dy;
        this.velocidade = velocidade;
    }

    public void run() {
        new Thread() {
            int dX=dXIni, dY=dYIni;
            @Override
            public void run() {
                int deslocX, deslocY;

                ((JScrollPane) view.getParent()).invalidate();
// while (dX!=0 || dY!=0) {
// if (dX>0) {
// dX-=1;
// deslocX=1;
// } else if (dX<0) {
// dX+=1;
// deslocX=-1;
// } else {
// deslocX=0;
// }

// if (dY>0) {
// dY-=1;
// deslocY=1;
// } else if (dY<0) {
// dY+=1;
// deslocY=-1;
// } else {
// deslocY=0;
// }

// Point posicaoView=view.getViewPosition();
// posicaoView.translate(deslocX, deslocY);
// ((JScrollPane) view.getParent()).invalidate();
// view.setViewPosition(posicaoView);
// ((JScrollPane) view.getParent()).revalidate();

//// try { sleep(10);
//// } catch (InterruptedException e) {}
// }
                while (dX!=0) {
                    if (dX>0) {
                        dX-=velocidade;
                        if (dX<0) {
                            dX=0;
                            deslocX=velocidade+dX;
                        } else {
                            deslocX=velocidade;
                        }
                    } else if (dX<0) {
                        dX+=velocidade;
                        if (dX>0) {
                            dX=0;
                            deslocX=-velocidade-dX;
                        } else {
                            deslocX=-velocidade;
                        }
                    } else {
                        deslocX=0;
                    }

                    Point posicaoView=view.getViewPosition();
                    posicaoView.translate(deslocX, 0);
                    view.setViewPosition(posicaoView);
                    ((JScrollPane) view.getParent()).revalidate();
                }
                while (dY!=0) {
                    if (dY>0) {
                        dY-=velocidade;
                        if (dY<0) {
                            dY=0;
                            deslocY=velocidade+dY;
                        } else {
                            deslocY=velocidade;
                        }
                    } else if (dY<0) {
                        dY+=velocidade;
                        if (dY>0) {
                            dY=0;
                            deslocY=-velocidade-dY;
                        } else {
                            deslocY=-velocidade;
                        }
                    } else {
                        deslocY=0;
                    }

                    Point posicaoView=view.getViewPosition();
                    posicaoView.translate(0, deslocY);
                    view.setViewPosition(posicaoView);
                    ((JScrollPane) view.getParent()).revalidate();
                }
            }
        }.run();
    }
}

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