/*

 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.awt.X11;

import java.awt.*;

import java.awt.event.*;

import java.awt.peer.*;

import java.lang.reflect.*;

import sun.awt.AWTAccessor;

class XScrollPanePeer extends XComponentPeer implements ScrollPanePeer, XScrollbarClient {

    public final static int     MARGIN = 1;

    public final static int     SCROLLBAR;

    public final static int     SPACE = 2;

    public final static int     SCROLLBAR_INSET = 2;

    public final static int     VERTICAL = 1 << 0;

    public final static int     HORIZONTAL = 1 << 1;

    static {

        SCROLLBAR = XToolkit.getUIDefaults().getInt("ScrollBar.defaultWidth");

    }

    XVerticalScrollbar       vsb;

    XHorizontalScrollbar     hsb;

    XWindow                  clip;

    int                         active=VERTICAL;

    int                         hsbSpace;

    int                         vsbSpace;

    static class XScrollPaneContentWindow extends XWindow {

        XScrollPaneContentWindow(ScrollPane target, long parentWindow) {

            super(target, parentWindow);

        }

        public String getWMName() {

            return "ScrollPane content";

        }

    }

    XScrollPanePeer(ScrollPane target) {

        super(target);

        // Create the clip window. The field "clip" must be null when

        // we call winCreate, or the parent of clip will be set to itself!

        clip = null;

        XWindow c = new XScrollPaneContentWindow(target,window);

        clip = c;

        vsb = new XVerticalScrollbar(this);

        hsb = new XHorizontalScrollbar(this);

        if (target.getScrollbarDisplayPolicy() == ScrollPane.SCROLLBARS_ALWAYS) {

            vsbSpace = hsbSpace = SCROLLBAR;

        } else {

            vsbSpace = hsbSpace = 0;

        }

        int unitIncrement = 1;

        Adjustable vAdjustable = target.getVAdjustable();

        if (vAdjustable != null){

            unitIncrement = vAdjustable.getUnitIncrement();

        }

        int h = height-hsbSpace;

        vsb.setValues(0, h, 0, h, unitIncrement, Math.max(1, (int)(h * 0.90)));

        vsb.setSize(vsbSpace-SCROLLBAR_INSET, h);

        unitIncrement = 1;

        Adjustable hAdjustable = target.getHAdjustable();

        if (hAdjustable != null){

            unitIncrement = hAdjustable.getUnitIncrement();

        }

        int w = width - vsbSpace;

        hsb.setValues(0, w, 0, w, unitIncrement, Math.max(1, (int)(w * 0.90)));

        hsb.setSize(w, hsbSpace-SCROLLBAR_INSET);

        setViewportSize();

        clip.xSetVisible(true);

    }

    public long getContentWindow()

    {

        return (clip == null) ? window : clip.getWindow();

    }

    public void setBounds(int x, int y, int w, int h, int op) {

        super.setBounds(x, y, w, h, op);

        if (clip == null) return;

        setScrollbarSpace();

        setViewportSize();

        repaint();

    }

    public Insets getInsets() {

        return new Insets(MARGIN, MARGIN, MARGIN+hsbSpace, MARGIN+vsbSpace);

    }

    public int getHScrollbarHeight() {

        return SCROLLBAR;

    }

    public int getVScrollbarWidth() {

        return SCROLLBAR;

    }

    public void childResized(int w, int h) {

        if (setScrollbarSpace()) {

            setViewportSize();

        }

        repaint();

    }

    Dimension getChildSize() {

        ScrollPane sp = (ScrollPane)target;

        if (sp.countComponents() > 0) {

            Component c = sp.getComponent(0);

            return c.size();

        } else {

            return new Dimension(0, 0);

        }

    }

    boolean setScrollbarSpace() {

        ScrollPane sp = (ScrollPane)target;

        boolean changed = false;

        int sbDisplayPolicy = sp.getScrollbarDisplayPolicy();

        if (sbDisplayPolicy == ScrollPane.SCROLLBARS_NEVER) {

            return changed;

        }

        Dimension cSize = getChildSize();

        if (sbDisplayPolicy == ScrollPane.SCROLLBARS_AS_NEEDED) {

            int oldHsbSpace = hsbSpace;

            int oldVsbSpace = vsbSpace;

            hsbSpace = (cSize.width <= (width - 2*MARGIN) ? 0 : SCROLLBAR);

            vsbSpace = (cSize.height <= (height - 2*MARGIN) ? 0 : SCROLLBAR);

            if (hsbSpace == 0 && vsbSpace != 0) {

                hsbSpace = (cSize.width <= (width - SCROLLBAR - 2*MARGIN) ? 0 : SCROLLBAR);

            }

            if (vsbSpace == 0 && hsbSpace != 0) {

                vsbSpace = (cSize.height <= (height - SCROLLBAR - 2*MARGIN) ? 0 : SCROLLBAR);

            }

            if (oldHsbSpace != hsbSpace || oldVsbSpace != vsbSpace) {

                changed = true;

            }

        }

        if (vsbSpace > 0) {

            int vis = height - (2*MARGIN) - hsbSpace;

            int max = Math.max(cSize.height, vis);

            vsb.setValues(vsb.getValue(), vis, 0, max);

            vsb.setBlockIncrement((int)(vsb.getVisibleAmount() * .90));

            vsb.setSize(vsbSpace-SCROLLBAR_INSET, height-hsbSpace);

            // Adjustable vadj = sp.getVAdjustable();

            // vadj.setVisibleAmount(vsb.vis);

            // vadj.setMaximum(vsb.max);

            // vadj.setBlockIncrement(vsb.page);

        }

        if (hsbSpace > 0) {

            int vis = width - (2*MARGIN) - vsbSpace;

            int max = Math.max(cSize.width, vis);

            hsb.setValues(hsb.getValue(), vis, 0, max);

            hsb.setBlockIncrement((int)(hsb.getVisibleAmount() * .90));

            hsb.setSize(width-vsbSpace, hsbSpace-SCROLLBAR_INSET);

            // Adjustable hadj = sp.getHAdjustable();

            // hadj.setVisibleAmount(hsb.vis);

            // hadj.setMaximum(hsb.max);

            // hadj.setBlockIncrement(hsb.page);

        }

        // Check to see if we hid either of the scrollbars but left

        // ourselves scrolled off of the top and/or right of the pane.

        // If we did, we need to scroll to the top and/or right of of

        // the pane to make it visible.

        //

        // Reminder: see if there is a better place to put this code.

        boolean must_scroll = false;

        // Get the point at which the ScrollPane is currently located

        // if number of components > 0

        Point p = new Point(0, 0);

        if (((ScrollPane)target).getComponentCount() > 0){

            p = ((ScrollPane)target).getComponent(0).location();

            if ((vsbSpace == 0) && (p.y < 0)) {

                p.y = 0;

                must_scroll = true;

            }

            if ((hsbSpace == 0) && (p.x < 0)) {

                p.x = 0;

                must_scroll = true;

            }

        }

        if (must_scroll)

            scroll(x, y, VERTICAL | HORIZONTAL);

        return changed;

    }

    void setViewportSize() {

        clip.xSetBounds(MARGIN, MARGIN,

                width - (2*MARGIN)  - vsbSpace,

                height - (2*MARGIN) - hsbSpace);

    }

    public void setUnitIncrement(Adjustable adj, int u) {

        if (adj.getOrientation() == Adjustable.VERTICAL) {

            vsb.setUnitIncrement(u);

        } else {

            // HORIZONTAL

            hsb.setUnitIncrement(u);

        }

    }

    public void setValue(Adjustable adj, int v) {

        if (adj.getOrientation() == Adjustable.VERTICAL) {

            scroll(-1, v, VERTICAL);

        } else {

            // HORIZONTAL

            scroll(v, -1, HORIZONTAL);

        }

    }

    public void setScrollPosition(int x, int y) {

        scroll(x, y, VERTICAL | HORIZONTAL);

    }

    void scroll(int x, int y, int flag) {

        scroll(x, y, flag, AdjustmentEvent.TRACK);

    }

    /**

     * Scroll the contents to position x, y

     */

    void scroll(int x, int y, int flag, int type) {

        checkSecurity();

        ScrollPane sp = (ScrollPane)target;

        Component c = getScrollChild();

        if (c == null) {

            return;

        }

        int sx, sy;

        Color colors[] = getGUIcolors();

        if (sp.getScrollbarDisplayPolicy() == ScrollPane.SCROLLBARS_NEVER) {

            sx = -x;

            sy = -y;

        } else {

            Point p = c.location();

            sx = p.x;

            sy = p.y;

            if ((flag & HORIZONTAL) != 0) {

                hsb.setValue(Math.min(x, hsb.getMaximum()-hsb.getVisibleAmount()));

                ScrollPaneAdjustable hadj = (ScrollPaneAdjustable)sp.getHAdjustable();

                setAdjustableValue(hadj, hsb.getValue(), type);

                sx = -(hsb.getValue());

                Graphics g = getGraphics();

                if (g != null) {

                    try {

                        paintHorScrollbar(g, colors, true);

                    } finally {

                        g.dispose();

                    }

                }

            }

            if ((flag & VERTICAL) != 0) {

                vsb.setValue(Math.min(y, vsb.getMaximum() - vsb.getVisibleAmount()));

                ScrollPaneAdjustable vadj = (ScrollPaneAdjustable)sp.getVAdjustable();

                setAdjustableValue(vadj, vsb.getValue(), type);

                sy = -(vsb.getValue());

                Graphics g = getGraphics();

                if (g != null) {

                    try {

                        paintVerScrollbar(g, colors, true);

                    } finally {

                        g.dispose();

                    }

                }

            }

        }

        c.move(sx, sy);

    }

    private void setAdjustableValue(final ScrollPaneAdjustable adj, final int value,

                            final int type) {

        AWTAccessor.getScrollPaneAdjustableAccessor().setTypedValue(adj, value,

                                                                    type);

    }

    @Override

    void paintPeer(final Graphics g) {

        final Color[] colors = getGUIcolors();

        g.setColor(colors[BACKGROUND_COLOR]);

        final int h = height - hsbSpace;

        final int w = width - vsbSpace;

        g.fillRect(0, 0, w, h);

        // paint rectangular region between scrollbars

        g.fillRect(w, h, vsbSpace, hsbSpace);

        if (MARGIN > 0) {

            draw3DRect(g, colors, 0, 0, w - 1, h - 1, false);

        }

        paintScrollBars(g, colors);

    }

    private void paintScrollBars(Graphics g, Color[] colors) {

        if (vsbSpace > 0) {

            paintVerScrollbar(g, colors, true);

            // paint the whole scrollbar

        }

        if (hsbSpace > 0) {

            paintHorScrollbar(g, colors, true);

            // paint the whole scrollbar

        }

    }

    void repaintScrollBars() {

        Graphics g = getGraphics();

        Color colors[] = getGUIcolors();

        if (g != null) {

            try {

                paintScrollBars(g, colors);

            } finally {

                g.dispose();

            }

        }

    }

    public void repaintScrollbarRequest(XScrollbar sb) {

        Graphics g = getGraphics();

        Color colors[] = getGUIcolors();

        if (g != null) {

            try {

                if (sb == vsb) {

                    paintVerScrollbar(g, colors, true);

                } else if (sb == hsb) {

                    paintHorScrollbar(g, colors, true);

                }

            } finally {

                g.dispose();

            }

        }

    }

    public void handleEvent(java.awt.AWTEvent e) {

        super.handleEvent(e);

        int id = e.getID();

        switch(id) {

            case PaintEvent.PAINT:

            case PaintEvent.UPDATE:

                repaintScrollBars();

                break;

        }

    }

    /**

     * Paint the horizontal scrollbar to the screen

     *

     * @param g the graphics context to draw into

     * @param colors the colors used to draw the scrollbar

     * @param paintAll paint the whole scrollbar if true, just the thumb if false

     */

    void paintHorScrollbar(Graphics g, Color colors[], boolean paintAll) {

        if (hsbSpace <= 0) {

            return;

        }

        Graphics ng = g.create();

        g.setColor(colors[BACKGROUND_COLOR]);

        // SCROLLBAR is the height of scrollbar area

        // but the actual scrollbar is SCROLLBAR-SPACE high;

        // the rest must be filled with background color

        int w = width - vsbSpace - (2*MARGIN);

        g.fillRect(MARGIN, height-SCROLLBAR, w, SPACE);

        g.fillRect(0, height-SCROLLBAR, MARGIN, SCROLLBAR);

        g.fillRect(MARGIN + w, height-SCROLLBAR, MARGIN, SCROLLBAR);

        try {

            ng.translate(MARGIN, height - (SCROLLBAR - SPACE));

            hsb.paint(ng, colors, paintAll);

        }

        finally {

            ng.dispose();

        }

    }

    /**

     * Paint the vertical scrollbar to the screen

     *

     * @param g the graphics context to draw into

     * @param colors the colors used to draw the scrollbar

     * @param paintAll paint the whole scrollbar if true, just the thumb if false

     */

    void paintVerScrollbar(Graphics g, Color colors[], boolean paintAll) {

        if (vsbSpace <= 0) {

            return;

        }

        Graphics ng = g.create();

        g.setColor(colors[BACKGROUND_COLOR]);

        // SCROLLBAR is the width of scrollbar area

        // but the actual scrollbar is SCROLLBAR-SPACE wide;

        // the rest must be filled with background color

        int h = height - hsbSpace - (2*MARGIN);

        g.fillRect(width-SCROLLBAR, MARGIN, SPACE, h);

        g.fillRect(width-SCROLLBAR, 0, SCROLLBAR, MARGIN);

        g.fillRect(width-SCROLLBAR, MARGIN+h, SCROLLBAR, MARGIN);

        try {

            ng.translate(width - (SCROLLBAR - SPACE), MARGIN);

            vsb.paint(ng, colors, paintAll);

        }

        finally {

            ng.dispose();

        }

    }

    /**

     *

     * @see java.awt.event.MouseEvent

     * MouseEvent.MOUSE_CLICKED

     * MouseEvent.MOUSE_PRESSED

     * MouseEvent.MOUSE_RELEASED

     * MouseEvent.MOUSE_MOVED

     * MouseEvent.MOUSE_ENTERED

     * MouseEvent.MOUSE_EXITED

     * MouseEvent.MOUSE_DRAGGED

     */

    public void handleJavaMouseEvent( MouseEvent mouseEvent ) {

        super.handleJavaMouseEvent(mouseEvent);

        int modifiers = mouseEvent.getModifiers();

        int id = mouseEvent.getID();

        int x = mouseEvent.getX();

        int y = mouseEvent.getY();

        //        super.handleMouseEvent(mouseEvent);

        if ((modifiers & InputEvent.BUTTON1_MASK) == 0) {

            return;

        }

        switch (id) {

            case MouseEvent.MOUSE_PRESSED:

                if (inVerticalScrollbar(x,y )) {

                    active = VERTICAL;

                    int h = height - hsbSpace - (2*MARGIN);

                    vsb.handleMouseEvent(id,modifiers,x - (width - SCROLLBAR + SPACE),y-MARGIN);

                } else if (inHorizontalScrollbar(x, y) ) {

                    active = HORIZONTAL;

                    int w = width - 2*MARGIN - vsbSpace;

                    hsb.handleMouseEvent(id,modifiers,x-MARGIN,y-(height - SCROLLBAR + SPACE));

                }

                break;

                // On mouse up, pass the event through to the scrollbar to stop

                // scrolling. The x & y passed do not matter.

            case MouseEvent.MOUSE_RELEASED:

                //     winReleaseCursorFocus();

                if (active == VERTICAL) {

                    vsb.handleMouseEvent(id,modifiers,x,y);

                } else if (active == HORIZONTAL) {

                    hsb.handleMouseEvent(id,modifiers,x,y);

                }

                break;

            case MouseEvent.MOUSE_DRAGGED:

                if ((active == VERTICAL)) {

                    int h = height - 2*MARGIN - hsbSpace;

                    vsb.handleMouseEvent(id,modifiers,x-(width - SCROLLBAR + SPACE),y-MARGIN);

                } else if ((active == HORIZONTAL)) {

                    int w = width - 2*MARGIN - vsbSpace;

                    hsb.handleMouseEvent(id,modifiers,x-MARGIN,y-(height - SCROLLBAR + SPACE));

                }

                break;

        }

    }

    /**

     * return value from the scrollbar

     */

    public void notifyValue(XScrollbar obj, int type, int v, boolean isAdjusting) {

        if (obj == vsb) {