org.eclipse.swt.widgets.ProgressBar Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2002, 2015 Innoopract Informationssysteme GmbH 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:
* Innoopract Informationssysteme GmbH - initial API and implementation
* EclipseSource - ongoing development
******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.rap.rwt.internal.lifecycle.WidgetLCA;
import org.eclipse.rap.rwt.internal.theme.ThemeAdapter;
import org.eclipse.rap.rwt.theme.BoxDimensions;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.internal.widgets.progressbarkit.ProgressBarLCA;
import org.eclipse.swt.internal.widgets.progressbarkit.ProgressBarThemeAdapter;
/**
* Instances of the receiver represent is an unselectable user interface object
* that is used to display progress, typically in the form of a bar.
*
* - Styles:
* - SMOOTH, HORIZONTAL, VERTICAL, INDETERMINATE
* - Events:
* - (none)
*
*
* Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
*
*
* IMPORTANT: This class is intended to be subclassed only within the
* SWT implementation.
*
* @since 1.0
*/
public class ProgressBar extends Control {
private int minimum;
private int selection;
private int maximum;
private int state;
/**
* 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 SWT#SMOOTH
* @see SWT#HORIZONTAL
* @see SWT#VERTICAL
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public ProgressBar( Composite parent, int style ) {
super( parent, checkStyle( style ) );
maximum = 100;
state = SWT.NORMAL;
}
static int checkStyle( int style ) {
int currStyle = style | SWT.NO_FOCUS;
return checkBits( currStyle, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0 );
}
@Override
public Point computeSize( int wHint, int hHint, boolean changed ) {
checkWidget();
BoxDimensions border = getBorder();
int barWidth = getProgressBarWidth();
int width = border.left + border.right;
int height = border.top + border.bottom;
if( ( style & SWT.HORIZONTAL ) != 0 ) {
width += barWidth * 10;
height += barWidth;
} else {
width += barWidth;
height += barWidth * 10;
}
if( wHint != SWT.DEFAULT ) {
width = wHint + border.left + border.right;
}
if( hHint != SWT.DEFAULT ) {
height = hHint + border.top + border.bottom;
}
return new Point( width, height );
}
/**
* Returns the maximum value which the receiver will allow.
*
* @return the maximum
* @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 getMaximum() {
checkWidget();
return maximum;
}
/**
* Returns the minimum value which the receiver will allow.
*
* @return the minimum
* @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 getMinimum() {
checkWidget();
return minimum;
}
/**
* Returns the single 'selection' that is the receiver's position.
*
* @return the selection
* @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 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
*
* - 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 setMaximum( int value ) {
checkWidget();
if( value > getMinimum() ) {
maximum = value;
if( selection > maximum ) {
selection = 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
*
* - 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 setMinimum( int value ) {
checkWidget();
if( value > 0 && value < getMaximum() ) {
minimum = value;
if( minimum > selection ) {
selection = minimum;
}
}
}
/**
* 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
*
* - 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 setSelection( int value ) {
checkWidget();
if( value < minimum ) {
selection = minimum;
} else if( value > maximum ) {
selection = maximum;
} else {
selection = value;
}
}
/**
* Sets the state of the receiver. The state must be one of these values:
*
* - {@link SWT#NORMAL}
* - {@link SWT#ERROR}
* - {@link SWT#PAUSED}
*
*
* @param state the new 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
*
* @since 1.3
*/
public void setState( int state ) {
checkWidget();
if( state == SWT.NORMAL || state == SWT.PAUSED || state == SWT.ERROR ) {
this.state = state;
}
}
/**
* Returns the state of the receiver. The value will be one of:
*
* - {@link SWT#NORMAL}
* - {@link SWT#ERROR}
* - {@link SWT#PAUSED}
*
*
* @return the 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
*
* @since 1.3
*/
public int getState() {
checkWidget();
return state;
}
@Override
@SuppressWarnings( "unchecked" )
public T getAdapter( Class adapter ) {
if( adapter == WidgetLCA.class ) {
return ( T )ProgressBarLCA.INSTANCE;
}
return super.getAdapter( adapter );
}
private int getProgressBarWidth() {
ThemeAdapter themeAdapter = getAdapter( ThemeAdapter.class );
return ( ( ProgressBarThemeAdapter )themeAdapter ).getProgressBarWidth( this );
}
}
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