package org.eclipse.swt.widgets; | |
/* | |
* (c) Copyright IBM Corp. 2000, 2001. | |
* All Rights Reserved | |
*/ | |
import org.eclipse.swt.widgets.*; | |
import org.eclipse.swt.graphics.*; | |
import org.eclipse.swt.*; | |
/** | |
* Instances of this class are selectable user interface | |
* objects that represent the dynamically positionable | |
* areas of a <code>CoolBar</code>. | |
* <dl> | |
* <dt><b>Styles:</b></dt> | |
* <dd>(none)</dd> | |
* <dt><b>Events:</b></dt> | |
* <dd>(none)</dd> | |
* </dl> | |
* <p> | |
* IMPORTANT: This class is <em>not</em> intended to be subclassed. | |
* </p> | |
*/ | |
public class CoolItem extends Item { | |
Control control; | |
CoolBar parent; | |
int preferredWidth, requestedWidth; | |
Rectangle itemBounds = new Rectangle(0, 0, 0, 0); | |
static final int MARGIN_WIDTH = 4; | |
static final int MARGIN_HEIGHT = 2; | |
static final int GRABBER_WIDTH = 2; | |
static final int MINIMUM_WIDTH = (2 * MARGIN_WIDTH) + GRABBER_WIDTH; | |
/** | |
* Constructs a new instance of this class given its parent | |
* (which must be a <code>CoolBar</code>) and a style value | |
* describing its behavior and appearance. The item is added | |
* to the end of the items maintained by its parent. | |
* <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 | |
* for all SWT widget classes should include a comment which | |
* describes the style constants which are applicable to the class. | |
* </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 SWT | |
* @see Widget#checkSubclass | |
* @see Widget#getStyle | |
*/ | |
public CoolItem (CoolBar parent, int style) { | |
super(parent, style); | |
this.parent = parent; | |
parent.createItem (this, parent.getItemCount()); | |
} | |
/** | |
* Constructs a new instance of this class given its parent | |
* (which must be a <code>CoolBar</code>), a style value | |
* describing its behavior and appearance, and the index | |
* at which to place it in the items maintained by its parent. | |
* <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 | |
* for all SWT widget classes should include a comment which | |
* describes the style constants which are applicable to the class. | |
* </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 | |
* @param index the index to store the receiver in its parent | |
* | |
* @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 SWT | |
* @see Widget#checkSubclass | |
* @see Widget#getStyle | |
*/ | |
public CoolItem (CoolBar parent, int style, int index) { | |
super(parent, 0); | |
this.parent = parent; | |
parent.createItem (this, index); | |
} | |
protected void checkSubclass () { | |
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS); | |
} | |
/** | |
* Returns the preferred size of the receiver. | |
* <p> | |
* The <em>prefered size</em> of a <code>CoolItem</code> is the size that | |
* it would best be displayed at. The width hint and height hint arguments | |
* allow the caller to ask the instance questions such as "Given a particular | |
* width, how high does it need to be to show all of the contents?" | |
* To indicate that the caller does not wish to constrain a particular | |
* dimension, the constant <code>SWT.DEFAULT</code> is passed for the hint. | |
* </p> | |
* | |
* @param wHint the width hint (can be <code>SWT.DEFAULT</code>) | |
* @param hHint the height hint (can be <code>SWT.DEFAULT</code>) | |
* @return the preferred size | |
* | |
* @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 Layout | |
*/ | |
public Point computeSize (int wHint, int hHint) { | |
checkWidget(); | |
int width = wHint, height = hHint; | |
if (wHint == SWT.DEFAULT) width = 32; | |
if (hHint == SWT.DEFAULT) height = 32; | |
width += MINIMUM_WIDTH + MARGIN_WIDTH; | |
height += 2 * MARGIN_HEIGHT; | |
return new Point (width, height); | |
} | |
public void dispose () { | |
if (isDisposed()) return; | |
/* | |
* Must call parent.destroyItem() before super.dispose(), since it needs to | |
* query the bounds to properly remove the item. | |
*/ | |
parent.destroyItem(this); | |
super.dispose (); | |
parent = null; | |
control = null; | |
} | |
/** | |
* Returns a rectangle describing the receiver's size and location | |
* relative to its parent. | |
* | |
* @return the receiver's bounding rectangle | |
* | |
* @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 Rectangle getBounds () { | |
checkWidget(); | |
return new Rectangle(itemBounds.x, itemBounds.y, itemBounds.width, itemBounds.height); | |
} | |
/** | |
* Gets the control which is associated with the receiver. | |
* | |
* @return the control | |
* | |
* @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 Control getControl () { | |
checkWidget(); | |
return control; | |
} | |
public Display getDisplay () { | |
Composite parent = this.parent; | |
if (parent == null) error (SWT.ERROR_WIDGET_DISPOSED); | |
return parent.getDisplay (); | |
} | |
/** | |
* Returns the receiver's parent, which must be a <code>CoolBar</code>. | |
* | |
* @return the receiver's parent | |
* | |
* @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 CoolBar getParent () { | |
checkWidget(); | |
return parent; | |
} | |
public Point getSize () { | |
checkWidget(); | |
return new Point (itemBounds.width, itemBounds.height); | |
} | |
/** | |
* Sets the control which is associated with the receiver | |
* to the argument. | |
* | |
* @param control the new control | |
* | |
* @exception IllegalArgumentException <ul> | |
* <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li> | |
* <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</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 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); | |
} | |
Control oldControl = this.control; | |
if (oldControl != null) oldControl.setVisible(false); | |
this.control = control; | |
if (control != null && !control.isDisposed ()) { | |
Rectangle bounds = getBounds(); | |
control.setBounds ( | |
bounds.x + MINIMUM_WIDTH, | |
bounds.y + MARGIN_HEIGHT, | |
bounds.width - MINIMUM_WIDTH - MARGIN_WIDTH, | |
bounds.height - (2 * MARGIN_HEIGHT)); | |
control.setVisible(true); | |
} | |
} | |
public void setSize (int width, int height) { | |
checkWidget(); | |
int newWidth = Math.max (width, MINIMUM_WIDTH); | |
itemBounds.width = preferredWidth = requestedWidth = newWidth; | |
itemBounds.height = height; | |
if (control != null) { | |
int controlWidth = newWidth - MINIMUM_WIDTH - MARGIN_WIDTH; | |
int controlHeight = height - (2 * MARGIN_HEIGHT); | |
control.setSize(controlWidth, controlHeight); | |
} | |
parent.relayout(); | |
} | |
public void setSize (Point size) { | |
checkWidget(); | |
if (size == null) error (SWT.ERROR_NULL_ARGUMENT); | |
setSize (size.x, size.y); | |
} | |
void setBounds (int x, int y, int width, int height) { | |
itemBounds.x = x; | |
itemBounds.y = y; | |
itemBounds.width = width; | |
itemBounds.height = height; | |
if (control != null) { | |
int controlHeight = Math.min(height, control.getSize().y); | |
control.setBounds( | |
x + MINIMUM_WIDTH, | |
y + MARGIN_HEIGHT, | |
width - MINIMUM_WIDTH - MARGIN_WIDTH, | |
controlHeight); | |
} | |
} | |
public Point getPreferredSize () { | |
checkWidget(); | |
int height = getSize().y; | |
return new Point(preferredWidth, height + (2 * MARGIN_HEIGHT)); | |
} | |
public void setPreferredSize (int width, int height) { | |
checkWidget(); | |
preferredWidth = Math.max (width, MINIMUM_WIDTH); | |
Rectangle bounds = getBounds(); | |
setBounds(bounds.x, bounds.y, bounds.width, height); | |
if (height != bounds.height) parent.relayout(); | |
} | |
public void setPreferredSize (Point size) { | |
checkWidget(); | |
if (size == null) error(SWT.ERROR_NULL_ARGUMENT); | |
setPreferredSize(size.x, size.y); | |
} | |
} |