| /* |
| * Copyright (c) 1996, 2015, 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.AWTAccessor; |
| import sun.awt.AWTAccessor.ComponentAccessor; |
| import sun.awt.PeerEvent; |
| |
| import sun.util.logging.PlatformLogger; |
| |
| final 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(); |
| @Override |
| native void create(WComponentPeer parent); |
| native int getOffset(int orient); |
| |
| WScrollPanePeer(Component target) { |
| super(target); |
| scrollbarWidth = _getVScrollbarWidth(); |
| scrollbarHeight = _getHScrollbarHeight(); |
| } |
| |
| @Override |
| void initialize() { |
| super.initialize(); |
| setInsets(); |
| Insets i = getInsets(); |
| setScrollPosition(-i.left,-i.top); |
| } |
| |
| @Override |
| public void setUnitIncrement(Adjustable adj, int p) { |
| // The unitIncrement is grabbed from the target as needed. |
| } |
| |
| @Override |
| public Insets insets() { |
| return getInsets(); |
| } |
| private native void setInsets(); |
| |
| @Override |
| public synchronized native void setScrollPosition(int x, int y); |
| |
| @Override |
| public int getHScrollbarHeight() { |
| return scrollbarHeight; |
| } |
| private native int _getHScrollbarHeight(); |
| |
| @Override |
| 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. |
| */ |
| @Override |
| public void childResized(int width, int height) { |
| ScrollPane sp = (ScrollPane)target; |
| Dimension vs = sp.getSize(); |
| setSpans(vs.width, vs.height, width, height); |
| setInsets(); |
| } |
| |
| synchronized native 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. |
| */ |
| @Override |
| 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. |
| */ |
| @SuppressWarnings("serial") // JDK-implementation class |
| class ScrollEvent extends PeerEvent { |
| ScrollEvent(Object source, Runnable runnable) { |
| super(source, runnable, 0L); |
| } |
| |
| @Override |
| public PeerEvent coalesceEvents(PeerEvent newEvent) { |
| if (log.isLoggable(PlatformLogger.Level.FINEST)) { |
| log.finest("ScrollEvent coalesced: " + newEvent); |
| } |
| if (newEvent instanceof ScrollEvent) { |
| return newEvent; |
| } |
| return null; |
| } |
| } |
| |
| /* |
| * 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; |
| } |
| |
| @Override |
| 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.Level.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.Level.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. |
| AWTAccessor.getScrollPaneAdjustableAccessor().setTypedValue(adj, |
| newpos, |
| type); |
| |
| // Paint the exposed area right away. To do this - find |
| // the heavyweight ancestor of the scroll child. |
| Component hwAncestor = getScrollChild(); |
| final ComponentAccessor acc = AWTAccessor.getComponentAccessor(); |
| while (hwAncestor != null |
| && !(acc.getPeer(hwAncestor) instanceof WComponentPeer)) |
| { |
| hwAncestor = hwAncestor.getParent(); |
| } |
| if (log.isLoggable(PlatformLogger.Level.FINE)) { |
| if (hwAncestor == null) { |
| log.fine("Assertion (hwAncestor != null) failed, " + |
| "couldn't find heavyweight ancestor of scroll pane child"); |
| } |
| } |
| WComponentPeer hwPeer = acc.getPeer(hwAncestor); |
| hwPeer.paintDamagedAreaImmediately(); |
| } |
| } |
| |
| } |