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/*******************************************************************************
 * Copyright (c) 2000, 2009 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
 *******************************************************************************/
package org.eclipse.swt.widgets;

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;

/**
 * Instances of this class represent a selectable user interface object
 * that represents a expandable item in a expand bar.
 * 

*

*
Styles:
*
(none)
*
Events:
*
(none)
*
*

* IMPORTANT: This class is not intended to be subclassed. *

* * @see ExpandBar * @see Sample code and further information * * @since 3.2 * @noextend This class is not intended to be subclassed by clients. */ public class ExpandItem extends Item { ExpandBar parent; Control control; boolean expanded; int x, y, width, height; int imageHeight, imageWidth; static final int TEXT_INSET = 6; static final int BORDER = 1; static final int CHEVRON_SIZE = 24; /** * Constructs a new instance of this class given its parent * and a style value describing its behavior and appearance. *

* The style value is either one of the style constants defined in * class SWT which is applicable to instances of this * class, or must be built by bitwise OR'ing together * (that is, using the int "|" operator) two or more * of those SWT style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. *

* * @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
    *
  • ERROR_NULL_ARGUMENT - if the parent is null
  • *
* @exception SWTException
    *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
  • *
  • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
  • *
* * @see Widget#checkSubclass * @see Widget#getStyle */ public ExpandItem (ExpandBar parent, int style) { this (parent, style, checkNull (parent).getItemCount ()); } /** * Constructs a new instance of this class given its parent, a * style value describing its behavior and appearance, and the index * at which to place it in the items maintained by its parent. *

* The style value is either one of the style constants defined in * class SWT which is applicable to instances of this * class, or must be built by bitwise OR'ing together * (that is, using the int "|" operator) two or more * of those SWT style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. *

* * @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 * @param index the zero-relative index to store the receiver in its parent * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the parent is null
  • *
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)
  • *
* @exception SWTException
    *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
  • *
  • ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass
  • *
* * @see Widget#checkSubclass * @see Widget#getStyle */ public ExpandItem (ExpandBar parent, int style, int index) { super (parent, style); this.parent = parent; parent.createItem (this, style, index); } static ExpandBar checkNull (ExpandBar control) { if (control == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); return control; } @Override public void dispose () { if (isDisposed ()) return; //if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); parent.destroyItem (this); super.dispose(); parent = null; control = null; } void drawChevron (GC gc, int x, int y) { int [] polyline1, polyline2; if (expanded) { int px = x + 4 + 5; int py = y + 4 + 7; polyline1 = new int [] { px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3, px+3,py-2, px+4,py-2, px+4,py-1, px+5,py-1, px+5,py, px+6,py}; py += 4; polyline2 = new int [] { px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3, px+3,py-2, px+4,py-2, px+4,py-1, px+5,py-1, px+5,py, px+6,py}; } else { int px = x + 4 + 5; int py = y + 4 + 4; polyline1 = new int[] { px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3, px+3,py+2, px+4,py+2, px+4,py+1, px+5,py+1, px+5,py, px+6,py}; py += 4; polyline2 = new int [] { px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3, px+3,py+2, px+4,py+2, px+4,py+1, px+5,py+1, px+5,py, px+6,py}; } gc.setForeground (display.getSystemColor (SWT.COLOR_TITLE_FOREGROUND)); gc.drawPolyline (polyline1); gc.drawPolyline (polyline2); } void drawItem (GC gc, boolean drawFocus) { int headerHeight = parent.getBandHeight (); Display display = getDisplay (); gc.setForeground (display.getSystemColor (SWT.COLOR_TITLE_BACKGROUND)); gc.setBackground (display.getSystemColor (SWT.COLOR_TITLE_BACKGROUND_GRADIENT)); gc.fillGradientRectangle (x, y, width, headerHeight, true); if (expanded) { gc.setForeground (display.getSystemColor (SWT.COLOR_TITLE_BACKGROUND_GRADIENT)); gc.drawLine (x, y + headerHeight, x, y + headerHeight + height - 1); gc.drawLine (x, y + headerHeight + height - 1, x + width - 1, y + headerHeight + height - 1); gc.drawLine (x + width - 1, y + headerHeight + height - 1, x + width - 1, y + headerHeight); } int drawX = x; if (image != null) { drawX += ExpandItem.TEXT_INSET; if (imageHeight > headerHeight) { gc.drawImage (image, drawX, y + headerHeight - imageHeight); } else { gc.drawImage (image, drawX, y + (headerHeight - imageHeight) / 2); } drawX += imageWidth; } if (text.length() > 0) { drawX += ExpandItem.TEXT_INSET; Point size = gc.stringExtent (text); gc.setForeground (parent.getForeground ()); gc.drawString (text, drawX, y + (headerHeight - size.y) / 2, true); } int chevronSize = ExpandItem.CHEVRON_SIZE; drawChevron (gc, x + width - chevronSize, y + (headerHeight - chevronSize) / 2); if (drawFocus) { gc.drawFocus (x + 1, y + 1, width - 2, headerHeight - 2); } } /** * Returns the control that is shown when the item is expanded. * If no control has been set, return null. * * @return the control * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public Control getControl() { checkWidget (); return control; } /** * Returns true if the receiver is expanded, * and false otherwise. * * @return the expanded state * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public boolean getExpanded() { checkWidget (); return expanded; } /** * Returns the height of the receiver's header * * @return the height of the header * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getHeaderHeight () { checkWidget (); return Math.max (parent.getBandHeight (), imageHeight); } /** * Gets the height of the receiver. * * @return the height * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getHeight () { checkWidget (); return height; } /** * Returns the receiver's parent, which must be a ExpandBar. * * @return the receiver's parent * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public ExpandBar getParent () { checkWidget (); return parent; } int getPreferredWidth (GC gc) { int width = ExpandItem.TEXT_INSET * 2 + ExpandItem.CHEVRON_SIZE; if (image != null) { width += ExpandItem.TEXT_INSET + imageWidth; } if (text.length() > 0) { width += gc.stringExtent (text).x; } return width; } void redraw () { int headerHeight = parent.getBandHeight (); if (imageHeight > headerHeight) { parent.redraw (x + ExpandItem.TEXT_INSET, y + headerHeight - imageHeight, imageWidth, imageHeight, false); } parent.redraw (x, y, width, headerHeight + height, false); } void setBounds (int x, int y, int width, int height, boolean move, boolean size) { redraw (); int headerHeight = parent.getBandHeight (); if (move) { if (imageHeight > headerHeight) { y += (imageHeight - headerHeight); } this.x = x; this.y = y; redraw (); } if (size) { this.width = width; this.height = height; redraw (); } if (control != null && !control.isDisposed ()) { if (move) control.setLocation (x + BORDER, y + headerHeight); if (size) control.setSize (Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER)); } } /** * Sets the control that is shown when the item is expanded. * * @param control the new control (or null) * * @exception IllegalArgumentException
    *
  • ERROR_INVALID_ARGUMENT - if the control has been disposed
  • *
  • ERROR_INVALID_PARENT - if the control is not in the same widget tree
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setControl(Control control) { checkWidget (); if (control != null) { if (control.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT); if (control.parent != parent) error (SWT.ERROR_INVALID_PARENT); } this.control = control; if (control != null) { control.setVisible (expanded); int headerHeight = parent.getBandHeight (); control.setBounds (x + BORDER, y + headerHeight, Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER)); } } /** * Sets the expanded state of the receiver. * * @param expanded the new expanded state * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setExpanded (boolean expanded) { checkWidget (); this.expanded = expanded; parent.showItem (this); } @Override public void setImage (Image image) { super.setImage (image); int oldImageHeight = imageHeight; if (image != null) { Rectangle bounds = image.getBounds (); imageHeight = bounds.height; imageWidth = bounds.width; } else { imageHeight = imageWidth = 0; } if (oldImageHeight != imageHeight) { parent.layoutItems (parent.indexOf (this), true); } else { redraw (); } } /** * Sets the height of the receiver. This is height of the item when it is expanded, * excluding the height of the header. * * @param height the new height * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setHeight (int height) { checkWidget (); if (height < 0) return; setBounds (0, 0, width, height, false, true); if (expanded) parent.layoutItems (parent.indexOf (this) + 1, true); } @Override public void setText (String string) { super.setText (string); redraw (); } }




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