--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/ExpandBar.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,578 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 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
+ *******************************************************************************/
+module dwt.widgets.ExpandBar;
+
+import dwt.dwthelper.utils;
+
+import dwt.DWT;
+import dwt.DWTException;
+import dwt.events.ExpandAdapter;
+import dwt.events.ExpandEvent;
+import dwt.events.ExpandListener;
+import dwt.graphics.Color;
+import dwt.graphics.Font;
+import dwt.graphics.FontMetrics;
+import dwt.graphics.GC;
+import dwt.graphics.Point;
+import dwt.graphics.Rectangle;
+
+/**
+ * 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
+ * 
+ * @since 3.2
+ */
+public class ExpandBar extends Composite {  
+    ExpandItem [] items;
+    int itemCount;
+    ExpandItem focusItem;
+    int spacing;
+    int yCurrentScroll;
+    Font font;
+    Color foreground;
+    Listener listener;
+    bool inDispose;
+    
+/**
+ * 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>DWT</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>DWT</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 DWTException <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 ExpandBar (Composite parent, int style) {
+    super (parent, checkStyle (style));
+    items = new ExpandItem [4]; 
+
+    listener = new Listener () {
+        public void handleEvent (Event event) {
+            switch (event.type) {
+                case DWT.Dispose:       onDispose (event);          break;
+                case DWT.MouseDown:     onMouseDown (event);        break;
+                case DWT.MouseUp:       onMouseUp (event);          break;
+                case DWT.Paint:         onPaint (event);            break;
+                case DWT.Resize:        onResize ();                break;
+                case DWT.KeyDown:       onKeyDown (event);          break;
+                case DWT.FocusIn:       onFocus ();                 break;
+                case DWT.FocusOut:      onFocus ();                 break;
+                case DWT.Traverse:      onTraverse (event);         break;
+            }
+        }
+    };
+    addListener (DWT.Dispose, listener);
+    addListener (DWT.MouseDown, listener);
+    addListener (DWT.MouseUp, listener);
+    addListener (DWT.Paint, listener);
+    addListener (DWT.Resize, listener);
+    addListener (DWT.KeyDown, listener);
+    addListener (DWT.FocusIn, listener);
+    addListener (DWT.FocusOut, listener);
+    addListener (DWT.Traverse, listener);
+    
+    ScrollBar verticalBar = getVerticalBar ();
+    if (verticalBar !is null) {
+        verticalBar.addListener (DWT.Selection, new Listener () {
+            public void handleEvent (Event event) {
+                onScroll (event);
+            }
+        });
+    }
+}
+
+/**
+ * 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 DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    TypedListener typedListener = new TypedListener (listener);
+    addListener (DWT.Expand, typedListener);
+    addListener (DWT.Collapse, typedListener);
+}
+
+static int checkStyle (int style) {
+    return style & ~DWT.H_SCROLL;
+}
+
+protected void checkSubclass () {
+    if (!isValidSubclass ()) error (DWT.ERROR_INVALID_SUBCLASS);
+}
+
+public Point computeSize (int wHint, int hHint, bool changed) {
+    checkWidget ();
+    int height = 0, width = 0;
+    if (wHint is DWT.DEFAULT || hHint is DWT.DEFAULT) {
+        if (itemCount > 0) {
+            height += spacing;
+            GC gc = new GC (this);
+            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 (gc));          
+            }
+            gc.dispose ();
+        }
+    }
+    if (width is 0) width = DEFAULT_WIDTH;
+    if (height is 0) height = DEFAULT_HEIGHT;
+    if (wHint !is DWT.DEFAULT) width = wHint;
+    if (hHint !is DWT.DEFAULT) height = hHint;
+    Rectangle trim = computeTrim (0, 0, width, height);
+    return new Point (trim.width, trim.height); 
+}
+
+void createItem (ExpandItem item, int style, int index) {
+    if (!(0 <= index && index <= itemCount)) error (DWT.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;
+    item.width = Math.max (0, getClientArea ().width - spacing * 2);
+    layoutItems (index, true);
+}
+
+void destroyItem (ExpandItem item) {
+    if (inDispose) return;
+    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 ();
+        } else {
+            focusItem = null;
+        }
+    }
+    System.arraycopy (items, index + 1, items, index, --itemCount - index);
+    items [itemCount] = null;
+    item.redraw ();
+    layoutItems (index, true);
+}
+
+int getBandHeight () {
+    if (font is null) return ExpandItem.CHEVRON_SIZE;
+    GC gc = new GC (this);
+    FontMetrics metrics = gc.getFontMetrics ();
+    gc.dispose ();
+    return Math.max (ExpandItem.CHEVRON_SIZE, metrics.getHeight ());
+}
+
+public Color getForeground () {
+    checkWidget ();
+    if (foreground is null) {
+        Display display = getDisplay ();
+        return display.getSystemColor (DWT.COLOR_TITLE_FOREGROUND);
+    }
+    return foreground;
+}
+
+/**
+ * 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 DWTException <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 (DWT.ERROR_INVALID_RANGE);    
+    return items [index];
+}
+
+/**
+ * Returns the number of items contained in the receiver.
+ *
+ * @return the number of items
+ *
+ * @exception DWTException <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 DWTException <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 DWTException <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 DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    for (int i = 0; i < itemCount; i++) {
+        if (items [i] is item) return i;
+    }
+    return -1;
+}
+
+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 ();
+}
+
+/**
+ * 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 DWTException <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 (DWT.ERROR_NULL_ARGUMENT);
+    if (eventTable is null) return;
+    eventTable.unhook (DWT.Expand, listener);
+    eventTable.unhook (DWT.Collapse, listener); 
+}
+
+public void setFont(Font font) {
+    super.setFont (font);
+    this.font = font;
+    layoutItems (0, true);
+}
+
+public void setForeground (Color color) {
+    super.setForeground (color);
+    foreground = color;
+}
+
+void setScrollbar () {
+    if (itemCount is 0) return;
+    ScrollBar verticalBar = getVerticalBar ();
+    if (verticalBar is null) return;
+    int height = getClientArea ().height;
+    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;
+    
+    int selection = Math.min (yCurrentScroll, maxHeight);
+    int increment = verticalBar.getIncrement ();
+    int pageIncrement = verticalBar.getPageIncrement ();
+    verticalBar.setValues(selection, 0, maxHeight, height, increment, pageIncrement);
+    verticalBar.setVisible(maxHeight > height);
+}
+
+/**
+ * Sets the receiver's spacing. Spacing specifies the number of pixels allocated around 
+ * each item.
+ *
+ * @exception DWTException <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;
+    int width = Math.max (0, getClientArea ().width - 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);
+    redraw ();
+}
+
+void showItem (ExpandItem item) {
+    Control control = item.control;
+    if (control !is null && !control.isDisposed ()) {
+        control.setVisible (item.expanded);
+    }
+    item.redraw ();
+    int index = indexOf (item);
+    layoutItems (index + 1, true);
+}
+
+void onDispose (Event event) {
+    removeListener (DWT.Dispose, listener);
+    notifyListeners (DWT.Dispose, event);
+    event.type = DWT.None;
+    /*
+     * Usually when an item is disposed, destroyItem will change the size of the items array, 
+     * reset the bounds of all the tabs and manage the widget associated with the tab.
+     * Since the whole folder is being disposed, this is not necessary.  For speed
+     * the inDispose flag is used to skip over this part of the item dispose.
+     */
+    inDispose = true;
+    
+    for (int i = 0; i < itemCount; i++) {               
+        items [i].dispose ();
+    }
+    items = null;
+    font = null;
+    foreground = null;
+    focusItem = null;
+}
+
+void onFocus () {
+    if (focusItem !is null) focusItem.redraw ();
+}
+
+void onKeyDown (Event event) {
+    if (focusItem is null) return;
+    switch (event.keyCode) {
+        case 13: /* Return */
+        case 32: /* Space */
+            Event ev = new Event ();
+            ev.item = focusItem;
+            sendEvent (focusItem.expanded ? DWT.Collapse :DWT.Expand, ev);
+            focusItem.expanded = !focusItem.expanded;
+            showItem (focusItem);
+            break;
+        case DWT.ARROW_UP: {
+            int focusIndex = indexOf (focusItem);
+            if (focusIndex > 0) {
+                focusItem.redraw ();
+                focusItem = items [focusIndex - 1];
+                focusItem.redraw ();
+            }
+            break;
+        }
+        case DWT.ARROW_DOWN: {
+            int focusIndex = indexOf (focusItem);
+            if (focusIndex < itemCount - 1) {
+                focusItem.redraw ();
+                focusItem = items [focusIndex + 1];
+                focusItem.redraw ();
+            }
+            break;
+        }
+    }
+}
+
+void onMouseDown (Event event) {
+    if (event.button !is 1) return;
+    int x = event.x;
+    int y = event.y;
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items[i];
+        bool hover = item.x <= x && x < (item.x + item.width) && item.y <= y && y < (item.y + getBandHeight ()); 
+        if (hover && item !is focusItem) {
+            focusItem.redraw ();
+            focusItem = item;
+            focusItem.redraw ();
+            forceFocus ();
+            break;
+        }
+    }
+}
+
+void onMouseUp (Event event) {
+    if (event.button !is 1) return;
+    if (focusItem is null) return;
+    int x = event.x;
+    int y = event.y;
+    bool hover = focusItem.x <= x && x < (focusItem.x + focusItem.width) && focusItem.y <= y && y < (focusItem.y + getBandHeight ()); 
+    if (hover) {
+        Event ev = new Event ();
+        ev.item = focusItem;
+        notifyListeners (focusItem.expanded ? DWT.Collapse : DWT.Expand, ev);
+        focusItem.expanded = !focusItem.expanded;
+        showItem (focusItem);
+    }
+}
+
+void onPaint (Event event) {
+    bool hasFocus = isFocusControl ();
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items [i];
+        item.drawItem (event.gc, hasFocus && item is focusItem);
+    }
+}
+
+void onResize () {
+    Rectangle rect = getClientArea ();  
+    int width = Math.max (0, rect.width - spacing * 2);
+    for (int i = 0; i < itemCount; i++) {
+        ExpandItem item = items[i];
+        item.setBounds (0, 0, width, item.height, false, true);
+    }
+    setScrollbar ();
+}
+
+void onScroll (Event event) {
+    ScrollBar verticalBar = getVerticalBar ();
+    if (verticalBar !is null) {
+        yCurrentScroll = verticalBar.getSelection();
+        layoutItems (0, false);
+    }
+}
+
+void onTraverse (Event event) {
+    switch (event.detail) {
+        case DWT.TRAVERSE_TAB_NEXT:
+        case DWT.TRAVERSE_TAB_PREVIOUS:
+            event.doit = true;
+            break;
+    }
+}
+
+}