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package org.eclipse.swt.widgets;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.*;
import org.eclipse.swt.graphics.*;
/**
* Instances of the receiver represent is 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</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* IMPORTANT: This class is intended to be subclassed <em>only</em>
* within the SWT implementation.
* </p>
*/
public class ProgressBar extends Control {
int min = 0, max = 100, value = 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
* 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 ProgressBar (Composite parent, int style) {
super (parent, checkStyle(style));
}
static int checkStyle (int style) {
return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
}
void createHandle (int index) {
state |= HANDLE;
handle = OS.gtk_progress_bar_new ();
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
OS.gtk_progress_configure (handle, value, min, max);
}
void setHandleStyle() {
int orientation = (style & SWT.VERTICAL) != 0 ? OS.GTK_PROGRESS_TOP_TO_BOTTOM : OS.GTK_PROGRESS_LEFT_TO_RIGHT;
OS.gtk_progress_bar_set_orientation (handle, orientation);
int style = (this.style & SWT.SMOOTH) == 0 ? OS.GTK_PROGRESS_DISCRETE : OS.GTK_PROGRESS_CONTINUOUS;
OS.gtk_progress_bar_set_bar_style (handle, style);
}
void showHandle() {
OS.gtk_widget_show (handle);
OS.gtk_widget_realize (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 max;
}
/**
* 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 min;
}
/**
* Returns the single <em>selection</em> 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 value;
}
/**
* Sets the maximum value which the receiver will allow
* to be the argument which must be greater than or
* equal to zero.
*
* @param value the new maximum (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 setMaximum (int maximum) {
checkWidget ();
if (maximum < 0) return;
max = maximum;
if (value > maximum) value = maximum;
OS.gtk_progress_configure (handle, value, min, max);
/*
* Feature in GTK. The progress bar does
* not redraw right away when a value is
* changed. This is not strictly incorrect
* but unexpected. The fix is to force all
* outstanding redraws to be delivered.
*/
update ();
}
/**
* Sets the minimum value which the receiver will allow
* to be the argument which must be greater than or
* equal to zero.
*
* @param value the new minimum (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 setMinimum (int minimum) {
checkWidget ();
if (minimum < 0) return;
if (value < minimum) value = minimum;
min = minimum;
OS.gtk_progress_configure (handle, value, min, max);
/*
* Feature in GTK. The progress bar does
* not redraw right away when a value is
* changed. This is not strictly incorrect
* but unexpected. The fix is to force all
* outstanding redraws to be delivered.
*/
update ();
}
/**
* Sets the single <em>selection</em> 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 x) {
checkWidget ();
if (x < 0) return;
value = x;
OS.gtk_progress_configure (handle, value, min, max);
/*
* Feature in GTK. The progress bar does
* not redraw right away when a value is
* changed. This is not strictly incorrect
* but unexpected. The fix is to force all
* outstanding redraws to be delivered.
*/
update ();
}
}
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