/*******************************************************************************
 * 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 dwt.custom.ViewForm;

import dwt.dwthelper.utils;



import dwt.DWT;
import dwt.DWTException;
import dwt.graphics.Color;
import dwt.graphics.GC;
import dwt.graphics.Point;
import dwt.graphics.RGB;
import dwt.graphics.Rectangle;
import dwt.widgets.Composite;
import dwt.widgets.Control;
import dwt.widgets.Event;
import dwt.widgets.Layout;
import dwt.widgets.Listener;
import dwt.custom.ViewFormLayout;

/**
 * Instances of this class implement a Composite that positions and sizes
 * children and allows programmatic control of layout and border parameters.
 * ViewForm is used in the workbench to lay out a view's label/menu/toolbar
 * local bar.
 * <p>
 * Note that although this class is a subclass of <code>Composite</code>,
 * it does not make sense to set a layout on it.
 * </p><p>
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>BORDER, FLAT</dd>
 * <dt><b>Events:</b></dt>
 * <dd>(None)</dd>
 * </dl>
 * <p>
 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
 * </p>
 *
 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
 */

public class ViewForm : Composite {

    /**
     * marginWidth specifies the number of pixels of horizontal margin
     * that will be placed along the left and right edges of the form.
     *
     * The default value is 0.
     */
    public int marginWidth = 0;
    /**
     * marginHeight specifies the number of pixels of vertical margin
     * that will be placed along the top and bottom edges of the form.
     *
     * The default value is 0.
     */
    public int marginHeight = 0;
    /**
     * horizontalSpacing specifies the number of pixels between the right
     * edge of one cell and the left edge of its neighbouring cell to
     * the right.
     *
     * The default value is 1.
     */
    public int horizontalSpacing = 1;
    /**
     * verticalSpacing specifies the number of pixels between the bottom
     * edge of one cell and the top edge of its neighbouring cell underneath.
     *
     * The default value is 1.
     */
    public int verticalSpacing = 1;

    /**
     * Color of innermost line of drop shadow border.
     *
     * NOTE This field is badly named and can not be fixed for backwards compatibility.
     * It should be capitalized.
     *
     * @deprecated
     */
    public static RGB borderInsideRGB;
    /**
     * Color of middle line of drop shadow border.
     *
     * NOTE This field is badly named and can not be fixed for backwards compatibility.
     * It should be capitalized.
     *
     * @deprecated
     */
    public static RGB borderMiddleRGB;
    /**
     * Color of outermost line of drop shadow border.
     *
     * NOTE This field is badly named and can not be fixed for backwards compatibility.
     * It should be capitalized.
     *
     * @deprecated
     */
    public static RGB borderOutsideRGB;

    // DWT widgets
    Control topLeft;
    Control topCenter;
    Control topRight;
    Control content;

    // Configuration and state info
    bool separateTopCenter = false;
    bool showBorder = false;

    int separator = -1;
    int borderTop = 0;
    int borderBottom = 0;
    int borderLeft = 0;
    int borderRight = 0;
    int highlight = 0;
    Point oldSize;

    Color selectionBackground;

    static final int OFFSCREEN = -200;
    static final int BORDER1_COLOR = DWT.COLOR_WIDGET_NORMAL_SHADOW;
    static final int SELECTION_BACKGROUND = DWT.COLOR_LIST_BACKGROUND;


    static this(){
        borderInsideRGB  = new RGB (132, 130, 132);
        borderMiddleRGB  = new RGB (143, 141, 138);
        borderOutsideRGB = new RGB (171, 168, 165);
    }
/**
 * 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 widget which will be the parent of the new instance (cannot be null)
 * @param style the style of widget 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>
 * </ul>
 *
 * @see DWT#BORDER
 * @see DWT#FLAT
 * @see #getStyle()
 */
public this(Composite parent, int style) {
    super(parent, checkStyle(style));
    super.setLayout(new ViewFormLayout());

    setBorderVisible((style & DWT.BORDER) !is 0);

    Listener listener = new class() Listener {
        public void handleEvent(Event e) {
            switch (e.type) {
                case DWT.Dispose: onDispose(); break;
                case DWT.Paint: onPaint(e.gc); break;
                case DWT.Resize: onResize(); break;
                default:
            }
        }
    };

    int[] events = [DWT.Dispose, DWT.Paint, DWT.Resize];

    for (int i = 0; i < events.length; i++) {
        addListener(events[i], listener);
    }
}

static int checkStyle (int style) {
    int mask = DWT.FLAT | DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT;
    return style & mask | DWT.NO_REDRAW_RESIZE;
}

//protected void checkSubclass () {
//  String name = getClass().getName ();
//  String validName = ViewForm.class.getName();
//  if (!validName.equals(name)) {
//      DWT.error (DWT.ERROR_INVALID_SUBCLASS);
//  }
//}

public override Rectangle computeTrim (int x, int y, int width, int height) {
    checkWidget ();
    int trimX = x - borderLeft - highlight;
    int trimY = y - borderTop - highlight;
    int trimWidth = width + borderLeft + borderRight + 2*highlight;
    int trimHeight = height + borderTop + borderBottom + 2*highlight;
    return new Rectangle(trimX, trimY, trimWidth, trimHeight);
}
public override Rectangle getClientArea() {
    checkWidget();
    Rectangle clientArea = super.getClientArea();
    clientArea.x += borderLeft;
    clientArea.y += borderTop;
    clientArea.width -= borderLeft + borderRight;
    clientArea.height -= borderTop + borderBottom;
    return clientArea;
}
/**
* Returns the content area.
*
* @return the control in the content area of the pane or null
*/
public Control getContent() {
    //checkWidget();
    return content;
}
/**
* Returns Control that appears in the top center of the pane.
* Typically this is a toolbar.
*
* @return the control in the top center of the pane or null
*/
public Control getTopCenter() {
    //checkWidget();
    return topCenter;
}
/**
* Returns the Control that appears in the top left corner of the pane.
* Typically this is a label such as CLabel.
*
* @return the control in the top left corner of the pane or null
*/
public Control getTopLeft() {
    //checkWidget();
    return topLeft;
}
/**
* Returns the control in the top right corner of the pane.
* Typically this is a Close button or a composite with a Menu and Close button.
*
* @return the control in the top right corner of the pane or null
*/
public Control getTopRight() {
    //checkWidget();
    return topRight;
}
void onDispose() {
    topLeft = null;
    topCenter = null;
    topRight = null;
    content = null;
    oldSize = null;
    selectionBackground = null;
}
void onPaint(GC gc) {
    Color gcForeground = gc.getForeground();
    Point size = getSize();
    Color border = getDisplay().getSystemColor(BORDER1_COLOR);
    if (showBorder) {
        gc.setForeground(border);
        gc.drawRectangle(0, 0, size.x - 1, size.y - 1);
        if (highlight > 0) {
            int x1 = 1;
            int y1 = 1;
            int x2 = size.x - 1;
            int y2 = size.y - 1;
            int[] shape = [x1,y1, x2,y1, x2,y2, x1,y2, x1,y1+highlight,
                               x1+highlight,y1+highlight, x1+highlight,y2-highlight,
                               x2-highlight,y2-highlight, x2-highlight,y1+highlight, x1,y1+highlight];
            Color highlightColor = getDisplay().getSystemColor(DWT.COLOR_LIST_SELECTION);
            gc.setBackground(highlightColor);
            gc.fillPolygon(shape);
        }
    }
    if (separator > -1) {
        gc.setForeground(border);
        gc.drawLine(borderLeft + highlight, separator, size.x - borderLeft - borderRight - highlight, separator);
    }
    gc.setForeground(gcForeground);
}
void onResize() {
    Point size = getSize();
    if (oldSize is null || oldSize.x is 0 || oldSize.y is 0) {
        redraw();
    } else {
        int width = 0;
        if (oldSize.x < size.x) {
            width = size.x - oldSize.x + borderRight + highlight;
        } else if (oldSize.x > size.x) {
            width = borderRight + highlight;
        }
        redraw(size.x - width, 0, width, size.y, false);

        int height = 0;
        if (oldSize.y < size.y) {
            height = size.y - oldSize.y + borderBottom + highlight;
        }
        if (oldSize.y > size.y) {
            height = borderBottom + highlight;
        }
        redraw(0, size.y - height, size.x, height, false);
    }
    oldSize = size;
}
/**
* Sets the content.
* Setting the content to null will remove it from
* the pane - however, the creator of the content must dispose of the content.
*
* @param content the control to be displayed in the content area or null
*
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm</li>
* </ul>
*/
public void setContent(Control content) {
    checkWidget();
    if (content !is null && content.getParent() !is this) {
        DWT.error(DWT.ERROR_INVALID_ARGUMENT);
    }
    if (this.content !is null && !this.content.isDisposed()) {
        this.content.setBounds(OFFSCREEN, OFFSCREEN, 0, 0);
    }
    this.content = content;
    layout(false);
}
/**
 * Sets the layout which is associated with the receiver to be
 * the argument which may be null.
 * <p>
 * Note: No Layout can be set on this Control because it already
 * manages the size and position of its children.
 * </p>
 *
 * @param layout the receiver's new layout or null
 *
 * @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 override void setLayout (Layout layout) {
    checkWidget();
    return;
}
void setSelectionBackground (Color color) {
    checkWidget();
    if (selectionBackground is color) return;
    if (color is null) color = getDisplay().getSystemColor(SELECTION_BACKGROUND);
    selectionBackground = color;
    redraw();
}
/**
* Set the control that appears in the top center of the pane.
* Typically this is a toolbar.
* The topCenter is optional.  Setting the topCenter to null will remove it from
* the pane - however, the creator of the topCenter must dispose of the topCenter.
*
* @param topCenter the control to be displayed in the top center or null
*
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm</li>
* </ul>
*/
public void setTopCenter(Control topCenter) {
    checkWidget();
    if (topCenter !is null && topCenter.getParent() !is this) {
        DWT.error(DWT.ERROR_INVALID_ARGUMENT);
    }
    if (this.topCenter !is null && !this.topCenter.isDisposed()) {
        Point size = this.topCenter.getSize();
        this.topCenter.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
    }
    this.topCenter = topCenter;
    layout(false);
}
/**
* Set the control that appears in the top left corner of the pane.
* Typically this is a label such as CLabel.
* The topLeft is optional.  Setting the top left control to null will remove it from
* the pane - however, the creator of the control must dispose of the control.
*
* @param c the control to be displayed in the top left corner or null
*
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm</li>
* </ul>
*/
public void setTopLeft(Control c) {
    checkWidget();
    if (c !is null && c.getParent() !is this) {
        DWT.error(DWT.ERROR_INVALID_ARGUMENT);
    }
    if (this.topLeft !is null && !this.topLeft.isDisposed()) {
        Point size = this.topLeft.getSize();
        this.topLeft.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
    }
    this.topLeft = c;
    layout(false);
}
/**
* Set the control that appears in the top right corner of the pane.
* Typically this is a Close button or a composite with a Menu and Close button.
* The topRight is optional.  Setting the top right control to null will remove it from
* the pane - however, the creator of the control must dispose of the control.
*
* @param c the control to be displayed in the top right corner or null
*
* @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>
*    <li>ERROR_INVALID_ARGUMENT - if the control is not a child of this ViewForm</li>
* </ul>
*/
public void setTopRight(Control c) {
    checkWidget();
    if (c !is null && c.getParent() !is this) {
        DWT.error(DWT.ERROR_INVALID_ARGUMENT);
    }
    if (this.topRight !is null && !this.topRight.isDisposed()) {
        Point size = this.topRight.getSize();
        this.topRight.setLocation(OFFSCREEN - size.x, OFFSCREEN - size.y);
    }
    this.topRight = c;
    layout(false);
}
/**
* Specify whether the border should be displayed or not.
*
* @param show true if the border should be displayed
*
* @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 setBorderVisible(bool show) {
    checkWidget();
    if (showBorder is show) return;

    showBorder = show;
    if (showBorder) {
        borderLeft = borderTop = borderRight = borderBottom = 1;
        if ((getStyle() & DWT.FLAT)is 0) highlight = 2;
    } else {
        borderBottom = borderTop = borderLeft = borderRight = 0;
        highlight = 0;
    }
    layout(false);
    redraw();
}
/**
* If true, the topCenter will always appear on a separate line by itself, otherwise the
* topCenter will appear in the top row if there is room and will be moved to the second row if
* required.
*
* @param show true if the topCenter will always appear on a separate line by itself
*
* @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 setTopCenterSeparate(bool show) {
    checkWidget();
    separateTopCenter = show;
    layout(false);
}
}