--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/widgets/ExpandBar.d	Mon Mar 02 14:44:16 2009 +0100
@@ -0,0 +1,845 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module org.eclipse.swt.widgets.ExpandBar;
+
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.SWTException;
+import org.eclipse.swt.events.ExpandAdapter;
+import org.eclipse.swt.events.ExpandEvent;
+import org.eclipse.swt.events.ExpandListener;
+import org.eclipse.swt.graphics.Font;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.GCData;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.graphics.Drawable;
+import org.eclipse.swt.internal.win32.OS;
+
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.ExpandItem;
+import org.eclipse.swt.widgets.ScrollBar;
+import org.eclipse.swt.widgets.ExpandItem;
+import org.eclipse.swt.widgets.TypedListener;
+import org.eclipse.swt.widgets.Event;
+
+import java.lang.all;
+
+/**
+ * Instances of this class support the layout of selectable
+ * expand bar items.
+ * <p>
+ * The item children that may be added to instances of this class
+ * must be of type <code>ExpandItem</code>.
+ * </p><p>
+ * <dl>
+ * <dt><b>Styles:</b></dt>
+ * <dd>V_SCROLL</dd>
+ * <dt><b>Events:</b></dt>
+ * <dd>Expand, Collapse</dd>
+ * </dl>
+ * </p><p>
+ * IMPORTANT: This class is <em>not</em> intended to be subclassed.
+ * </p>
+ *
+ * @see ExpandItem
+ * @see ExpandEvent
+ * @see ExpandListener
+ * @see ExpandAdapter
+ * @see <a href="http://www.eclipse.org/swt/snippets/#expandbar">ExpandBar snippets</a>
+ * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
+ * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
+ *
+ * @since 3.2
+ */
+public class ExpandBar : Composite {
+
+    alias Composite.computeSize computeSize;
+    alias Composite.windowProc windowProc;
+
+    ExpandItem[] items;
+    int itemCount;
+    ExpandItem focusItem;
+    int spacing = 4;
+    int yCurrentScroll;
+    HFONT hFont;
+
+
+/**
+ * Constructs a new instance of this class given its parent
+ * and a style value describing its behavior and appearance.
+ * <p>
+ * The style value is either one of the style constants defined in
+ * class <code>SWT</code> which is applicable to instances of this
+ * class, or must be built by <em>bitwise OR</em>'ing together
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>SWT</code> style constants. The class description
+ * lists the style constants that are applicable to the class.
+ * Style bits are also inherited from superclasses.
+ * </p>
+ *
+ * @param parent a composite control which will be the parent of the new instance (cannot be null)
+ * @param style the style of control to construct
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
+ *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
+ * </ul>
+ *
+ * @see Widget#checkSubclass
+ * @see Widget#getStyle
+ */
+public this (Composite parent, int style) {
+    super (parent, checkStyle (style));
+}
+
+/**
+ * Adds the listener to the collection of listeners who will
+ * be notified when an item in the receiver is expanded or collapsed
+ * by sending it one of the messages defined in the <code>ExpandListener</code>
+ * interface.
+ *
+ * @param listener the listener which should be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see ExpandListener
+ * @see #removeExpandListener
+ */
+public void addExpandListener (ExpandListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (SWT.Expand, typedListener);
+    addListener (SWT.Collapse, typedListener);
+}
+
+override int callWindowProc (HWND hwnd, int msg, int wParam, int lParam) {
+    if (handle is null) return 0;
+    return OS.DefWindowProc (hwnd, msg, wParam, lParam);
+}
+
+override protected void checkSubclass () {
+    if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
+}
+
+static int checkStyle (int style) {
+    style &= ~SWT.H_SCROLL;
+    return style | SWT.NO_BACKGROUND;
+}
+
+override public Point computeSize (int wHint, int hHint, bool changed) {
+    checkWidget ();
+    int height = 0, width = 0;
+    if (wHint is SWT.DEFAULT || hHint is SWT.DEFAULT) {
+        if (itemCount > 0) {
+            auto hDC = OS.GetDC (handle);
+            HTHEME hTheme;
+            if (isAppThemed ()) {
+                hTheme = display.hExplorerBarTheme ();
+            }
+            HFONT hCurrentFont, oldFont;
+            if (hTheme is null) {
+                if (hFont !is null) {
+                    hCurrentFont = hFont;
+                } else {
+                    static if (!OS.IsWinCE) {
+                        NONCLIENTMETRICS info;
+                        info.cbSize = NONCLIENTMETRICS.sizeof;
+                        if (OS.SystemParametersInfo (OS.SPI_GETNONCLIENTMETRICS, 0, &info, 0)) {
+                            LOGFONT* logFont = &info.lfCaptionFont;
+                            hCurrentFont = OS.CreateFontIndirect (logFont);
+                        }
+                    }
+                }
+                if (hCurrentFont !is null) {
+                    oldFont = OS.SelectObject (hDC, hCurrentFont);
+                }
+            }
+            height += spacing;
+            for (int i = 0; i < itemCount; i++) {
+                ExpandItem item = items [i];
+                height += item.getHeaderHeight ();
+                if (item.expanded) height += item.height;
+                height += spacing;
+                width = Math.max (width, item.getPreferredWidth (hTheme, hDC));
+            }
+            if (hCurrentFont !is null) {
+                OS.SelectObject (hDC, oldFont);
+                if (hCurrentFont !is hFont) OS.DeleteObject (hCurrentFont);
+            }
+            OS.ReleaseDC (handle, hDC);
+        }
+    }
+    if (width is 0) width = DEFAULT_WIDTH;
+    if (height is 0) height = DEFAULT_HEIGHT;
+    if (wHint !is SWT.DEFAULT) width = wHint;
+    if (hHint !is SWT.DEFAULT) height = hHint;
+    Rectangle trim = computeTrim (0, 0, width, height);
+    return new Point (trim.width, trim.height);
+}
+
+override void createHandle () {
+    super.createHandle ();
+    state &= ~CANVAS;
+    state |= TRACK_MOUSE;
+}
+
+void createItem (ExpandItem item, int style, int index) {
+    if (!(0 <= index && index <= itemCount)) error (SWT.ERROR_INVALID_RANGE);
+    if (itemCount is items.length) {
+        ExpandItem [] newItems = new ExpandItem [itemCount + 4];
+        System.arraycopy (items, 0, newItems, 0, items.length);
+        items = newItems;
+    }
+    System.arraycopy (items, index, items, index + 1, itemCount - index);
+    items [index] = item;
+    itemCount++;
+    if (focusItem is null) focusItem = item;
+
+    RECT rect;
+    OS.GetWindowRect (handle, &rect);
+    item.width = Math.max (0, rect.right - rect.left - spacing * 2);
+    layoutItems (index, true);
+}
+
+override void createWidget () {
+    super.createWidget ();
+    items = new ExpandItem [4];
+    if (!isAppThemed ()) {
+        backgroundMode = SWT.INHERIT_DEFAULT;
+    }
+}
+
+override int defaultBackground() {
+    if (!isAppThemed ()) {
+        return OS.GetSysColor (OS.COLOR_WINDOW);
+    }
+    return super.defaultBackground();
+}
+
+void destroyItem (ExpandItem item) {
+    int index = 0;
+    while (index < itemCount) {
+        if (items [index] is item) break;
+        index++;
+    }
+    if (index is itemCount) return;
+    if (item is focusItem) {
+        int focusIndex = index > 0 ? index - 1 : 1;
+        if (focusIndex < itemCount) {
+            focusItem = items [focusIndex];
+            focusItem.redraw (true);
+        } else {
+            focusItem = null;
+        }
+    }
+    System.arraycopy (items, index + 1, items, index, --itemCount - index);
+    items [itemCount] = null;
+    item.redraw (true);
+    layoutItems (index, true);
+}
+
+override void drawThemeBackground (HDC hDC, HWND hwnd, RECT* rect) {
+    RECT rect2;
+    OS.GetClientRect (handle, &rect2);
+    OS.MapWindowPoints (handle, hwnd, cast(POINT*) &rect2, 2);
+    OS.DrawThemeBackground (display.hExplorerBarTheme (), hDC, OS.EBP_NORMALGROUPBACKGROUND, 0, &rect2, null);
+}
+
+void drawWidget (GC gc, RECT* clipRect) {
+    HTHEME hTheme;
+    if (isAppThemed ()) {
+        hTheme = display.hExplorerBarTheme ();
+    }
+    if (hTheme !is null) {
+        RECT rect;
+        OS.GetClientRect (handle, &rect);
+        OS.DrawThemeBackground (hTheme, gc.handle, OS.EBP_HEADERBACKGROUND, 0, &rect, clipRect);
+    } else {
+        drawBackground (gc.handle);
+    }
+    bool drawFocus = false;
+    if (handle is OS.GetFocus ()) {
+        int uiState = OS.SendMessage (handle, OS.WM_QUERYUISTATE, 0, 0);
+        drawFocus = (uiState & OS.UISF_HIDEFOCUS) is 0;
+    }
+    HFONT hCurrentFont, oldFont;
+    if (hTheme is null) {
+        if (hFont !is null) {
+            hCurrentFont = hFont;
+        } else {
+            if (!OS.IsWinCE) {
+                NONCLIENTMETRICS info;
+                info.cbSize = NONCLIENTMETRICS.sizeof;
+                if (OS.SystemParametersInfo (OS.SPI_GETNONCLIENTMETRICS, 0, &info, 0)) {
+                    LOGFONT* logFont = &info.lfCaptionFont;
+                    hCurrentFont = OS.CreateFontIndirect (logFont);
+                }
+            }
+        }
+        if (hCurrentFont !is null) {
+            oldFont = OS.SelectObject (gc.handle, hCurrentFont);
+        }
+        if (foreground !is -1) {
+            OS.SetTextColor (gc.handle, foreground);
+        }
+    }
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items[i];
+        item.drawItem (gc, hTheme, clipRect, item is focusItem && drawFocus);
+    }
+    if (hCurrentFont !is null) {
+        OS.SelectObject (gc.handle, oldFont);
+        if (hCurrentFont !is hFont) OS.DeleteObject (hCurrentFont);
+    }
+}
+
+override Control findBackgroundControl () {
+    Control control = super.findBackgroundControl ();
+    if (!isAppThemed ()) {
+        if (control is null) control = this;
+    }
+    return control;
+}
+
+override Control findThemeControl () {
+    return isAppThemed () ? this : super.findThemeControl ();
+}
+
+int getBandHeight () {
+    if (hFont is null) return ExpandItem.CHEVRON_SIZE;
+    auto hDC = OS.GetDC (handle);
+    auto oldHFont = OS.SelectObject (hDC, hFont);
+    TEXTMETRIC lptm;
+    OS.GetTextMetrics (hDC, &lptm);
+    OS.SelectObject (hDC, oldHFont);
+    OS.ReleaseDC (handle, hDC);
+    return Math.max (ExpandItem.CHEVRON_SIZE, lptm.tmHeight + 4);
+}
+
+/**
+ * Returns the item at the given, zero-relative index in the
+ * receiver. Throws an exception if the index is out of range.
+ *
+ * @param index the index of the item to return
+ * @return the item at the given index
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public ExpandItem getItem (int index) {
+    checkWidget ();
+    if (!(0 <= index && index < itemCount)) error (SWT.ERROR_INVALID_RANGE);
+    return items [index];
+}
+
+/**
+ * Returns the number of items contained in the receiver.
+ *
+ * @return the number of items
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getItemCount () {
+    checkWidget ();
+    return itemCount;
+}
+
+/**
+ * Returns an array of <code>ExpandItem</code>s which are the items
+ * in the receiver.
+ * <p>
+ * Note: This is not the actual structure used by the receiver
+ * to maintain its list of items, so modifying the array will
+ * not affect the receiver.
+ * </p>
+ *
+ * @return the items in the receiver
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public ExpandItem [] getItems () {
+    checkWidget ();
+    ExpandItem [] result = new ExpandItem [itemCount];
+    System.arraycopy (items, 0, result, 0, itemCount);
+    return result;
+}
+
+/**
+ * Returns the receiver's spacing.
+ *
+ * @return the spacing
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int getSpacing () {
+    checkWidget ();
+    return spacing;
+}
+
+/**
+ * Searches the receiver's list starting at the first item
+ * (index 0) until an item is found that is equal to the
+ * argument, and returns the index of that item. If no item
+ * is found, returns -1.
+ *
+ * @param item the search item
+ * @return the index of the item
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
+ *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public int indexOf (ExpandItem item) {
+    checkWidget ();
+    if (item is null) error (SWT.ERROR_NULL_ARGUMENT);
+    for (int i = 0; i < itemCount; i++) {
+        if (items [i] is item) return i;
+    }
+    return -1;
+}
+
+bool isAppThemed () {
+    if (background !is -1) return false;
+    if (foreground !is -1) return false;
+    if (hFont !is null) return false;
+    return OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ();
+}
+
+void layoutItems (int index, bool setScrollbar_) {
+    if (index < itemCount) {
+        int y = spacing - yCurrentScroll;
+        for (int i = 0; i < index; i++) {
+            ExpandItem item = items [i];
+            if (item.expanded) y += item.height;
+            y += item.getHeaderHeight () + spacing;
+        }
+        for (int i = index; i < itemCount; i++) {
+            ExpandItem item = items [i];
+            item.setBounds (spacing, y, 0, 0, true, false);
+            if (item.expanded) y += item.height;
+            y += item.getHeaderHeight () + spacing;
+        }
+    }
+    if (setScrollbar_) setScrollbar ();
+}
+
+override void releaseChildren (bool destroy) {
+    if (items !is null) {
+        for (int i=0; i<items.length; i++) {
+            ExpandItem item = items [i];
+            if (item !is null && !item.isDisposed ()) {
+                item.release (false);
+            }
+        }
+        items = null;
+    }
+    focusItem = null;
+    super.releaseChildren (destroy);
+}
+
+/**
+ * Removes the listener from the collection of listeners who will
+ * be notified when items in the receiver are expanded or collapsed.
+ *
+ * @param listener the listener which should no longer be notified
+ *
+ * @exception IllegalArgumentException <ul>
+ *    <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see ExpandListener
+ * @see #addExpandListener
+ */
+public void removeExpandListener (ExpandListener listener) {
+    checkWidget ();
+    if (listener is null) error (SWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (SWT.Expand, listener);
+    eventTable.unhook (SWT.Collapse, listener);
+}
+
+override void setBackgroundPixel (int pixel) {
+    super.setBackgroundPixel (pixel);
+    static if (!OS.IsWinCE) {
+        int flags = OS.RDW_ERASE | OS.RDW_FRAME | OS.RDW_INVALIDATE | OS.RDW_ALLCHILDREN;
+        OS.RedrawWindow (handle, null, null, flags);
+    }
+}
+
+override public void setFont (Font font) {
+    super.setFont (font);
+    hFont = font !is null ? font.handle : null;
+    layoutItems (0, true);
+}
+
+override void setForegroundPixel (int pixel) {
+    super.setForegroundPixel (pixel);
+    static if (!OS.IsWinCE) {
+        int flags = OS.RDW_ERASE | OS.RDW_FRAME | OS.RDW_INVALIDATE | OS.RDW_ALLCHILDREN;
+        OS.RedrawWindow (handle, null, null, flags);
+    }
+}
+
+void setScrollbar () {
+    if (itemCount is 0) return;
+    if ((style & SWT.V_SCROLL) is 0) return;
+    RECT rect;
+    OS.GetClientRect (handle, &rect);
+    int height = rect.bottom - rect.top;
+    ExpandItem item = items [itemCount - 1];
+    int maxHeight = item.y + getBandHeight () + spacing;
+    if (item.expanded) maxHeight += item.height;
+
+    //claim bottom free space
+    if (yCurrentScroll > 0 && height > maxHeight) {
+        yCurrentScroll = Math.max (0, yCurrentScroll + maxHeight - height);
+        layoutItems (0, false);
+    }
+    maxHeight += yCurrentScroll;
+
+    SCROLLINFO info;
+    info.cbSize = SCROLLINFO.sizeof;
+    info.fMask = OS.SIF_RANGE | OS.SIF_PAGE | OS.SIF_POS;
+    info.nMin = 0;
+    info.nMax = maxHeight;
+    info.nPage = height;
+    info.nPos = Math.min (yCurrentScroll, info.nMax);
+    if (info.nPage !is 0) info.nPage++;
+    OS.SetScrollInfo (handle, OS.SB_VERT, &info, true);
+}
+
+/**
+ * Sets the receiver's spacing. Spacing specifies the number of pixels allocated around
+ * each item.
+ * 
+ * @param spacing the spacing around each item
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ */
+public void setSpacing (int spacing) {
+    checkWidget ();
+    if (spacing < 0) return;
+    if (spacing is this.spacing) return;
+    this.spacing = spacing;
+    RECT rect;
+    OS.GetClientRect (handle, &rect);
+    int width = Math.max (0, (rect.right - rect.left) - spacing * 2);
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items[i];
+        if (item.width !is width) item.setBounds (0, 0, width, item.height, false, true);
+    }
+    layoutItems (0, true);
+    OS.InvalidateRect (handle, null, true);
+}
+
+void showItem (ExpandItem item) {
+    Control control = item.control;
+    if (control !is null && !control.isDisposed ()) {
+        control.setVisible (item.expanded);
+    }
+    item.redraw (true);
+    int index = indexOf (item);
+    layoutItems (index + 1, true);
+}
+
+void showFocus (bool up) {
+    RECT rect;
+    OS.GetClientRect (handle, &rect);
+    int height = rect.bottom - rect.top;
+    int updateY = 0;
+    if (up) {
+        if (focusItem.y < 0) {
+            updateY = Math.min (yCurrentScroll, -focusItem.y);
+        }
+    } else {
+        int itemHeight = focusItem.y + getBandHeight ();
+        if (focusItem.expanded) {
+            if (height >= getBandHeight () + focusItem.height) {
+                itemHeight += focusItem.height;
+            }
+        }
+        if (itemHeight > height) {
+            updateY = height - itemHeight;
+        }
+    }
+    if (updateY !is 0) {
+        yCurrentScroll = Math.max (0, yCurrentScroll - updateY);
+        if ((style & SWT.V_SCROLL) !is 0) {
+            SCROLLINFO info;
+            info.cbSize = SCROLLINFO.sizeof;
+            info.fMask = OS.SIF_POS;
+            info.nPos = yCurrentScroll;
+            OS.SetScrollInfo (handle, OS.SB_VERT, &info, true);
+        }
+        OS.ScrollWindowEx (handle, 0, updateY, null, null, null, null, OS.SW_SCROLLCHILDREN | OS.SW_INVALIDATE);
+        for (int i = 0; i < itemCount; i++) {
+            items [i].y += updateY;
+        }
+    }
+}
+
+override String windowClass () {
+    return display.windowClass;
+}
+
+override int windowProc () {
+    return cast(int) display.windowProc;
+}
+
+override LRESULT WM_KEYDOWN (int wParam, int lParam) {
+    LRESULT result = super.WM_KEYDOWN (wParam, lParam);
+    if (result !is null) return result;
+    if (focusItem is null) return result;
+    switch (wParam) {
+        case OS.VK_SPACE:
+        case OS.VK_RETURN:
+            Event event = new Event ();
+            event.item = focusItem;
+            sendEvent (focusItem.expanded ? SWT.Collapse : SWT.Expand, event);
+            focusItem.expanded = !focusItem.expanded;
+            showItem (focusItem);
+            return LRESULT.ZERO;
+        case OS.VK_UP: {
+            int focusIndex = indexOf (focusItem);
+            if (focusIndex > 0) {
+                focusItem.redraw (true);
+                focusItem = items [focusIndex - 1];
+                focusItem.redraw (true);
+                showFocus (true);
+                return LRESULT.ZERO;
+            }
+            break;
+        }
+        case OS.VK_DOWN: {
+            int focusIndex = indexOf (focusItem);
+            if (focusIndex < itemCount - 1) {
+                focusItem.redraw (true);
+                focusItem = items [focusIndex + 1];
+                focusItem.redraw (true);
+                showFocus (false);
+                return LRESULT.ZERO;
+            }
+            break;
+        }
+        default:
+    }
+    return result;
+}
+
+override LRESULT WM_KILLFOCUS (int wParam, int lParam) {
+    LRESULT result = super.WM_KILLFOCUS (wParam, lParam);
+    if (focusItem !is null) focusItem.redraw (true);
+    return result;
+}
+
+override LRESULT WM_LBUTTONDOWN (int wParam, int lParam) {
+    LRESULT result = super.WM_LBUTTONDOWN (wParam, lParam);
+    if (result is LRESULT.ZERO) return result;
+    int x = OS.GET_X_LPARAM (lParam);
+    int y = OS.GET_Y_LPARAM (lParam);
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items[i];
+        bool hover = item.isHover (x, y);
+        if (hover && focusItem !is item) {
+            focusItem.redraw (true);
+            focusItem = item;
+            focusItem.redraw (true);
+            forceFocus ();
+            break;
+        }
+    }
+    return result;
+}
+
+override LRESULT WM_LBUTTONUP (int wParam, int lParam) {
+    LRESULT result = super.WM_LBUTTONUP (wParam, lParam);
+    if (result is LRESULT.ZERO) return result;
+    if (focusItem is null) return result;
+    int x = OS.GET_X_LPARAM (lParam);
+    int y = OS.GET_Y_LPARAM (lParam);
+    bool hover = focusItem.isHover (x, y);
+    if (hover) {
+        Event event = new Event ();
+        event.item = focusItem;
+        sendEvent (focusItem.expanded ? SWT.Collapse : SWT.Expand, event);
+        focusItem.expanded = !focusItem.expanded;
+        showItem (focusItem);
+    }
+    return result;
+}
+
+override LRESULT WM_MOUSELEAVE (int wParam, int lParam) {
+    LRESULT result = super.WM_MOUSELEAVE (wParam, lParam);
+    if (result !is null) return result;
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items [i];
+        if (item.hover) {
+            item.hover = false;
+            item.redraw (false);
+            break;
+        }
+    }
+    return result;
+}
+
+override LRESULT WM_MOUSEMOVE (int wParam, int lParam) {
+    LRESULT result = super.WM_MOUSEMOVE (wParam, lParam);
+    if (result is LRESULT.ZERO) return result;
+    int x = OS.GET_X_LPARAM (lParam);
+    int y = OS.GET_Y_LPARAM (lParam);
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items [i];
+        bool hover = item.isHover (x, y);
+        if (item.hover !is hover) {
+            item.hover = hover;
+            item.redraw (false);
+        }
+    }
+    return result;
+}
+
+override LRESULT WM_PAINT (int wParam, int lParam) {
+    PAINTSTRUCT ps;
+    GCData data = new GCData ();
+    data.ps = &ps;
+    data.hwnd = handle;
+    GC gc = new_GC (data);
+    if (gc !is null) {
+        int width = ps.rcPaint.right - ps.rcPaint.left;
+        int height = ps.rcPaint.bottom - ps.rcPaint.top;
+        if (width !is 0 && height !is 0) {
+            RECT rect;
+            OS.SetRect (&rect, ps.rcPaint.left, ps.rcPaint.top, ps.rcPaint.right, ps.rcPaint.bottom);
+            drawWidget (gc, &rect);
+            if (hooks (SWT.Paint) || filters (SWT.Paint)) {
+                Event event = new Event ();
+                event.gc = gc;
+                event.x = rect.left;
+                event.y = rect.top;
+                event.width = width;
+                event.height = height;
+                sendEvent (SWT.Paint, event);
+                event.gc = null;
+            }
+        }
+        gc.dispose ();
+    }
+    return LRESULT.ZERO;
+}
+
+override LRESULT WM_PRINTCLIENT (int wParam, int lParam) {
+    LRESULT result = super.WM_PRINTCLIENT (wParam, lParam);
+    RECT rect;
+    OS.GetClientRect (handle, &rect);
+    GCData data = new GCData ();
+    data.device = display;
+    data.foreground = getForegroundPixel ();
+    GC gc = GC.win32_new ( cast(Drawable)cast(void*)wParam, data);
+    drawWidget (gc, &rect);
+    gc.dispose ();
+    return result;
+}
+
+override LRESULT WM_SETCURSOR (int wParam, int lParam) {
+    LRESULT result = super.WM_SETCURSOR (wParam, lParam);
+    if (result !is null) return result;
+    int hitTest = cast(short) OS.LOWORD (lParam);
+    if (hitTest is OS.HTCLIENT) {
+        for (int i = 0; i < itemCount; i++) {
+            ExpandItem item = items [i];
+            if (item.hover) {
+                auto hCursor = OS.LoadCursor (null, OS.IDC_HAND);
+                OS.SetCursor (hCursor);
+                return LRESULT.ONE;
+            }
+        }
+    }
+    return result;
+}
+
+override LRESULT WM_SETFOCUS (int wParam, int lParam) {
+    LRESULT result = super.WM_SETFOCUS (wParam, lParam);
+    if (focusItem !is null) focusItem.redraw (true);
+    return result;
+}
+
+override LRESULT WM_SIZE (int wParam, int lParam) {
+    LRESULT result = super.WM_SIZE (wParam, lParam);
+    RECT rect;
+    OS.GetClientRect (handle, &rect);
+    int width = Math.max (0, (rect.right - rect.left) - spacing * 2);
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items[i];
+        if (item.width !is width) item.setBounds (0, 0, width, item.height, false, true);
+    }
+    setScrollbar ();
+    OS.InvalidateRect (handle, null, true);
+    return result;
+}
+
+override LRESULT wmScroll (ScrollBar bar, bool update, HWND hwnd, int msg, int wParam, int lParam) {
+    LRESULT result = super.wmScroll (bar, true, hwnd, msg, wParam, lParam);
+    SCROLLINFO info;
+    info.cbSize = SCROLLINFO.sizeof;
+    info.fMask = OS.SIF_POS;
+    OS.GetScrollInfo (handle, OS.SB_VERT, &info);
+    int updateY = yCurrentScroll - info.nPos;
+    OS.ScrollWindowEx (handle, 0, updateY, null, null, null, null, OS.SW_SCROLLCHILDREN | OS.SW_INVALIDATE);
+    yCurrentScroll = info.nPos;
+    if (updateY !is 0) {
+        for (int i = 0; i < itemCount; i++) {
+            items [i].y += updateY;
+        }
+    }
+    return result;
+}
+}
+