src/windows/classes/sun/awt/windows/WScrollPanePeer.java - toolchain/jdk/jdk9_jdk - Git at Google

 /*
  * Copyright (c) 1996, 2003, 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.windows;

 import java.awt.*;
 import java.awt.event.AdjustmentEvent;
 import java.awt.peer.ScrollPanePeer;
 import sun.awt.PeerEvent;

 import sun.util.logging.PlatformLogger;

 class WScrollPanePeer extends WPanelPeer implements ScrollPanePeer {

     private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.windows.WScrollPanePeer");

     int scrollbarWidth;
     int scrollbarHeight;
     int prevx;
     int prevy;

     static {
         initIDs();
     }

     static native void initIDs();
     native void create(WComponentPeer parent);
     native int getOffset(int orient);

     WScrollPanePeer(Component target) {
         super(target);
         scrollbarWidth = _getVScrollbarWidth();
         scrollbarHeight = _getHScrollbarHeight();
     }

     void initialize() {
         super.initialize();
         setInsets();
         Insets i = getInsets();
         setScrollPosition(-i.left,-i.top);
     }

     public void setUnitIncrement(Adjustable adj, int p) {
         // The unitIncrement is grabbed from the target as needed.
     }

     public Insets insets() {
         return getInsets();
     }
     private native void setInsets();

     public native synchronized void setScrollPosition(int x, int y);

     public int getHScrollbarHeight() {
         return scrollbarHeight;
     }
     private native int _getHScrollbarHeight();

     public int getVScrollbarWidth() {
         return scrollbarWidth;
     }
     private native int _getVScrollbarWidth();

     public Point getScrollOffset() {
         int x = getOffset(Adjustable.HORIZONTAL);
         int y = getOffset(Adjustable.VERTICAL);
         return new Point(x, y);
     }

     /**
      * The child component has been resized.  The scrollbars must be
      * updated with the new sizes.  At the native level the sizes of
      * the actual windows may not have changed yet, so the size
      * information from the java-level is passed down and used.
      */
     public void childResized(int width, int height) {
         ScrollPane sp = (ScrollPane)target;
         Dimension vs = sp.getSize();
         setSpans(vs.width, vs.height, width, height);
         setInsets();
     }

     native synchronized void setSpans(int viewWidth, int viewHeight,
                                       int childWidth, int childHeight);

     /**
      * Called by ScrollPane's internal observer of the scrollpane's adjustables.
      * This is called whenever a scroll position is changed in one
      * of adjustables, whether it was modified externally or from the
      * native scrollbars themselves.
      */
     public void setValue(Adjustable adj, int v) {
         Component c = getScrollChild();
         if (c == null) {
             return;
         }

         Point p = c.getLocation();
         switch(adj.getOrientation()) {
         case Adjustable.VERTICAL:
             setScrollPosition(-(p.x), v);
             break;
         case Adjustable.HORIZONTAL:
             setScrollPosition(v, -(p.y));
             break;
         }
     }

     private Component getScrollChild() {
         ScrollPane sp = (ScrollPane)target;
         Component child = null;
         try {
             child = sp.getComponent(0);
         } catch (ArrayIndexOutOfBoundsException e) {
             // do nothing.  in this case we return null
         }
         return child;
     }

     /*
      * Called from Windows in response to WM_VSCROLL/WM_HSCROLL message
      */
     private void postScrollEvent(int orient, int type,
                                  int pos, boolean isAdjusting)
     {
         Runnable adjustor = new Adjustor(orient, type, pos, isAdjusting);
         WToolkit.executeOnEventHandlerThread(new ScrollEvent(target, adjustor));
     }

     /*
      * Event that executes on the Java dispatch thread to move the
      * scroll bar thumbs and paint the exposed area in one synchronous
      * operation.
      */
     class ScrollEvent extends PeerEvent {
         ScrollEvent(Object source, Runnable runnable) {
             super(source, runnable, 0L);
         }

         public PeerEvent coalesceEvents(PeerEvent newEvent) {
             if (log.isLoggable(PlatformLogger.FINEST)) {
                 log.finest("ScrollEvent coalesced: " + newEvent);
             }
             if (newEvent instanceof ScrollEvent) {
                 return newEvent;
             }
             return null;
         }
     }

     native void setTypedValue(ScrollPaneAdjustable adjustable, int newpos, int type);

     /*
      * Runnable for the ScrollEvent that performs the adjustment.
      */
     class Adjustor implements Runnable {
         int orient;             // selects scrollbar
         int type;               // adjustment type
         int pos;                // new position (only used for absolute)
         boolean isAdjusting;    // isAdjusting status

         Adjustor(int orient, int type, int pos, boolean isAdjusting) {
             this.orient = orient;
             this.type = type;
             this.pos = pos;
             this.isAdjusting = isAdjusting;
         }

         public void run() {
             if (getScrollChild() == null) {
                 return;
             }
             ScrollPane sp = (ScrollPane)WScrollPanePeer.this.target;
             ScrollPaneAdjustable adj = null;

             // ScrollPaneAdjustable made public in 1.4, but
             // get[HV]Adjustable can't be declared to return
             // ScrollPaneAdjustable because it would break backward
             // compatibility -- hence the cast

             if (orient == Adjustable.VERTICAL) {
                 adj = (ScrollPaneAdjustable)sp.getVAdjustable();
             } else if (orient == Adjustable.HORIZONTAL) {
                 adj = (ScrollPaneAdjustable)sp.getHAdjustable();
             } else {
                 if (log.isLoggable(PlatformLogger.FINE)) {
                     log.fine("Assertion failed: unknown orient");
                 }
             }

             if (adj == null) {
                 return;
             }

             int newpos = adj.getValue();
             switch (type) {
               case AdjustmentEvent.UNIT_DECREMENT:
                   newpos -= adj.getUnitIncrement();
                   break;
               case AdjustmentEvent.UNIT_INCREMENT:
                   newpos += adj.getUnitIncrement();
                   break;
               case AdjustmentEvent.BLOCK_DECREMENT:
                   newpos -= adj.getBlockIncrement();
                   break;
               case AdjustmentEvent.BLOCK_INCREMENT:
                   newpos += adj.getBlockIncrement();
                   break;
               case AdjustmentEvent.TRACK:
                   newpos = this.pos;
                   break;
               default:
                   if (log.isLoggable(PlatformLogger.FINE)) {
                       log.fine("Assertion failed: unknown type");
                   }
                   return;
             }

             // keep scroll position in acceptable range
             newpos = Math.max(adj.getMinimum(), newpos);
             newpos = Math.min(adj.getMaximum(), newpos);

             // set value, this will synchronously fire an AdjustmentEvent
             adj.setValueIsAdjusting(isAdjusting);

             // Fix for 4075484 - consider type information when creating AdjustmentEvent
             // We can't just call adj.setValue() because it creates AdjustmentEvent with type=TRACK
             // Instead, we call private method setTypedValue of ScrollPaneAdjustable.
             // Because ScrollPaneAdjustable is in another package we should call it through native code.
             setTypedValue(adj, newpos, type);

             // Paint the exposed area right away.  To do this - find
             // the heavyweight ancestor of the scroll child.
             Component hwAncestor = getScrollChild();
             while (hwAncestor != null
                    && !(hwAncestor.getPeer() instanceof WComponentPeer))
             {
                 hwAncestor = hwAncestor.getParent();
             }
             if (log.isLoggable(PlatformLogger.FINE)) {
                 if (hwAncestor == null) {
                     log.fine("Assertion (hwAncestor != null) failed, " +
                              "couldn't find heavyweight ancestor of scroll pane child");
                 }
             }
             WComponentPeer hwPeer = (WComponentPeer)hwAncestor.getPeer();
             hwPeer.paintDamagedAreaImmediately();
         }
     }

 }
	/*
	* Copyright (c) 1996, 2003, 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.windows;

	import java.awt.*;
	import java.awt.event.AdjustmentEvent;
	import java.awt.peer.ScrollPanePeer;
	import sun.awt.PeerEvent;

	import sun.util.logging.PlatformLogger;

	class WScrollPanePeer extends WPanelPeer implements ScrollPanePeer {

	private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.windows.WScrollPanePeer");

	int scrollbarWidth;
	int scrollbarHeight;
	int prevx;
	int prevy;

	static {
	initIDs();
	}

	static native void initIDs();
	native void create(WComponentPeer parent);
	native int getOffset(int orient);

	WScrollPanePeer(Component target) {
	super(target);
	scrollbarWidth = _getVScrollbarWidth();
	scrollbarHeight = _getHScrollbarHeight();
	}

	void initialize() {
	super.initialize();
	setInsets();
	Insets i = getInsets();
	setScrollPosition(-i.left,-i.top);
	}

	public void setUnitIncrement(Adjustable adj, int p) {
	// The unitIncrement is grabbed from the target as needed.
	}

	public Insets insets() {
	return getInsets();
	}
	private native void setInsets();

	public native synchronized void setScrollPosition(int x, int y);

	public int getHScrollbarHeight() {
	return scrollbarHeight;
	}
	private native int _getHScrollbarHeight();

	public int getVScrollbarWidth() {
	return scrollbarWidth;
	}
	private native int _getVScrollbarWidth();

	public Point getScrollOffset() {
	int x = getOffset(Adjustable.HORIZONTAL);
	int y = getOffset(Adjustable.VERTICAL);
	return new Point(x, y);
	}

	/**
	* The child component has been resized. The scrollbars must be
	* updated with the new sizes. At the native level the sizes of
	* the actual windows may not have changed yet, so the size
	* information from the java-level is passed down and used.
	*/
	public void childResized(int width, int height) {
	ScrollPane sp = (ScrollPane)target;
	Dimension vs = sp.getSize();
	setSpans(vs.width, vs.height, width, height);
	setInsets();
	}

	native synchronized void setSpans(int viewWidth, int viewHeight,
	int childWidth, int childHeight);

	/**
	* Called by ScrollPane's internal observer of the scrollpane's adjustables.
	* This is called whenever a scroll position is changed in one
	* of adjustables, whether it was modified externally or from the
	* native scrollbars themselves.
	*/
	public void setValue(Adjustable adj, int v) {
	Component c = getScrollChild();
	if (c == null) {
	return;
	}

	Point p = c.getLocation();
	switch(adj.getOrientation()) {
	case Adjustable.VERTICAL:
	setScrollPosition(-(p.x), v);
	break;
	case Adjustable.HORIZONTAL:
	setScrollPosition(v, -(p.y));
	break;
	}
	}

	private Component getScrollChild() {
	ScrollPane sp = (ScrollPane)target;
	Component child = null;
	try {
	child = sp.getComponent(0);
	} catch (ArrayIndexOutOfBoundsException e) {
	// do nothing. in this case we return null
	}
	return child;
	}

	/*
	* Called from Windows in response to WM_VSCROLL/WM_HSCROLL message
	*/
	private void postScrollEvent(int orient, int type,
	int pos, boolean isAdjusting)
	{
	Runnable adjustor = new Adjustor(orient, type, pos, isAdjusting);
	WToolkit.executeOnEventHandlerThread(new ScrollEvent(target, adjustor));
	}

	/*
	* Event that executes on the Java dispatch thread to move the
	* scroll bar thumbs and paint the exposed area in one synchronous
	* operation.
	*/
	class ScrollEvent extends PeerEvent {
	ScrollEvent(Object source, Runnable runnable) {
	super(source, runnable, 0L);
	}

	public PeerEvent coalesceEvents(PeerEvent newEvent) {
	if (log.isLoggable(PlatformLogger.FINEST)) {
	log.finest("ScrollEvent coalesced: " + newEvent);
	}
	if (newEvent instanceof ScrollEvent) {
	return newEvent;
	}
	return null;
	}
	}

	native void setTypedValue(ScrollPaneAdjustable adjustable, int newpos, int type);

	/*
	* Runnable for the ScrollEvent that performs the adjustment.
	*/
	class Adjustor implements Runnable {
	int orient; // selects scrollbar
	int type; // adjustment type
	int pos; // new position (only used for absolute)
	boolean isAdjusting; // isAdjusting status

	Adjustor(int orient, int type, int pos, boolean isAdjusting) {
	this.orient = orient;
	this.type = type;
	this.pos = pos;
	this.isAdjusting = isAdjusting;
	}

	public void run() {
	if (getScrollChild() == null) {
	return;
	}
	ScrollPane sp = (ScrollPane)WScrollPanePeer.this.target;
	ScrollPaneAdjustable adj = null;

	// ScrollPaneAdjustable made public in 1.4, but
	// get[HV]Adjustable can't be declared to return
	// ScrollPaneAdjustable because it would break backward
	// compatibility -- hence the cast

	if (orient == Adjustable.VERTICAL) {
	adj = (ScrollPaneAdjustable)sp.getVAdjustable();
	} else if (orient == Adjustable.HORIZONTAL) {
	adj = (ScrollPaneAdjustable)sp.getHAdjustable();
	} else {
	if (log.isLoggable(PlatformLogger.FINE)) {
	log.fine("Assertion failed: unknown orient");
	}
	}

	if (adj == null) {
	return;
	}

	int newpos = adj.getValue();
	switch (type) {
	case AdjustmentEvent.UNIT_DECREMENT:
	newpos -= adj.getUnitIncrement();
	break;
	case AdjustmentEvent.UNIT_INCREMENT:
	newpos += adj.getUnitIncrement();
	break;
	case AdjustmentEvent.BLOCK_DECREMENT:
	newpos -= adj.getBlockIncrement();
	break;
	case AdjustmentEvent.BLOCK_INCREMENT:
	newpos += adj.getBlockIncrement();
	break;
	case AdjustmentEvent.TRACK:
	newpos = this.pos;
	break;
	default:
	if (log.isLoggable(PlatformLogger.FINE)) {
	log.fine("Assertion failed: unknown type");
	}
	return;
	}

	// keep scroll position in acceptable range
	newpos = Math.max(adj.getMinimum(), newpos);
	newpos = Math.min(adj.getMaximum(), newpos);

	// set value, this will synchronously fire an AdjustmentEvent
	adj.setValueIsAdjusting(isAdjusting);

	// Fix for 4075484 - consider type information when creating AdjustmentEvent
	// We can't just call adj.setValue() because it creates AdjustmentEvent with type=TRACK
	// Instead, we call private method setTypedValue of ScrollPaneAdjustable.
	// Because ScrollPaneAdjustable is in another package we should call it through native code.
	setTypedValue(adj, newpos, type);

	// Paint the exposed area right away. To do this - find
	// the heavyweight ancestor of the scroll child.
	Component hwAncestor = getScrollChild();
	while (hwAncestor != null
	&& !(hwAncestor.getPeer() instanceof WComponentPeer))
	{
	hwAncestor = hwAncestor.getParent();
	}
	if (log.isLoggable(PlatformLogger.FINE)) {
	if (hwAncestor == null) {
	log.fine("Assertion (hwAncestor != null) failed, " +
	"couldn't find heavyweight ancestor of scroll pane child");
	}
	}
	WComponentPeer hwPeer = (WComponentPeer)hwAncestor.getPeer();
	hwPeer.paintDamagedAreaImmediately();
	}
	}

	}