javauis/eswt_qt/org.eclipse.swt/Eclipse SWT/qt/org/eclipse/swt/widgets/ProgressBar.java
/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* Portion Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
* 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
* Nokia Corporation - Qt implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.internal.qt.OS;
import org.eclipse.swt.internal.qt.WidgetState;
/**
* Instances of the receiver represent an unselectable
* user interface object that is used to display progress,
* typically in the form of a bar.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>SMOOTH, HORIZONTAL, VERTICAL, INDETERMINATE</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
* </p><p>
* IMPORTANT: This class is intended to be subclassed <em>only</em>
* within the SWT implementation.
* </p>
*/
public class ProgressBar extends Control {
int minimum = 0, maximum = 100, selection = 0;
/**
* 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 SWT#SMOOTH
* @see SWT#HORIZONTAL
* @see SWT#VERTICAL
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public ProgressBar (Composite parent, int style) {
super (parent, checkStyle(style));
}
static int checkStyle (int style) {
style |= SWT.NO_FOCUS;
style = checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
return checkBits (style, SWT.SMOOTH, SWT.INDETERMINATE, 0, 0, 0, 0);
}
void createHandle_pp (int index) {
topHandle = handle = OS.QProgressBar_new();
state |= WidgetState.HANDLE;
setStyle();
}
void setStyle(){
if ( ( style & SWT.VERTICAL ) != 0 )
{
OS.QProgressBar_setOrientation(handle,OS.QT_VERTICAL);
}
if ( ( style & SWT.INDETERMINATE ) != 0 )
{
OS.QProgressBar_setMaximum(handle, maximum);
}
OS.QProgressBar_setTextInVisible(handle);
}
/**
* Returns the maximum value which the receiver will allow.
*
* @return the maximum
*
* @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 getMaximum () {
checkWidget ();
return maximum;
}
/**
* Returns the minimum value which the receiver will allow.
*
* @return the minimum
*
* @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 getMinimum () {
checkWidget ();
return minimum;
}
/**
* Returns the single 'selection' that is the receiver's position.
*
* @return the selection
*
* @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 getSelection () {
checkWidget ();
return selection;
}
/**
* Sets the maximum value that the receiver will allow. This new
* value will be ignored if it is not greater than the receiver's current
* minimum value. If the new maximum is applied then the receiver's
* selection value will be adjusted if necessary to fall within its new range.
*
* @param value the new maximum, which must be greater than the current minimum
*
* @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 setMaximum (int value) {
checkWidget ();
if (value <= minimum) return;
maximum = value;
selection = Math.min (selection, maximum);
//According to QT Attempting to change the current value to one outside the minimum-maximum
//range has no effect on the current value. But in eSWT, If the new maximum is applied then
// the receiver's selection value will be adjusted if necessary to fall within its new range.
// So we need to call setSelection
if( value <= selection && !( (style & SWT.INDETERMINATE) != 0 ) )
OS.QProgressBar_setValue(handle,selection);
if( !( (style & SWT.INDETERMINATE) != 0 ) )
{
OS.QProgressBar_setMaximum(handle, maximum);
}
}
/**
* Sets the minimum value that the receiver will allow. This new
* value will be ignored if it is negative or is not less than the receiver's
* current maximum value. If the new minimum is applied then the receiver's
* selection value will be adjusted if necessary to fall within its new range.
*
* @param value the new minimum, which must be nonnegative and less than the current maximum
*
* @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 setMinimum (int value) {
checkWidget ();
if (value < 0 || value >= maximum) return;
minimum = value;
selection = Math.max (selection, minimum);
if( !( (style & SWT.INDETERMINATE) != 0 ) )
{
OS.QProgressBar_setMinimum(handle, value);
}
}
/**
* Sets the single 'selection' that is the receiver's
* position to the argument which must be greater than or equal
* to zero.
*
* @param value the new selection (must be zero or greater)
*
* @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 setSelection (int value) {
checkWidget ();
selection = Math.max (minimum, Math.min (maximum, value));
if( !( (style & SWT.INDETERMINATE) != 0 ) )
{
OS.QProgressBar_setValue(handle, selection);
}
}
}