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/*******************************************************************************
* Copyright (c) 2000, 2005 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.internal.gtk.*;
/**
* 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, 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 timerId, minimum = 0, maximum = 100, selection = 0;
static final int DELAY = 100;
/**
* 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;
return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
}
void createHandle (int index) {
state |= HANDLE;
fixedHandle = OS.g_object_new (display.gtk_fixed_get_type (), 0);
if (fixedHandle == 0) error (SWT.ERROR_NO_HANDLES);
OS.gtk_fixed_set_has_window (fixedHandle, true);
handle = OS.gtk_progress_bar_new ();
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
OS.gtk_container_add (fixedHandle, handle);
int orientation = (style & SWT.VERTICAL) != 0 ? OS.GTK_PROGRESS_BOTTOM_TO_TOP : OS.GTK_PROGRESS_LEFT_TO_RIGHT;
OS.gtk_progress_bar_set_orientation (handle, orientation);
if ((style & SWT.INDETERMINATE) != 0) {
timerId = OS.gtk_timeout_add (DELAY, display.windowTimerProc, 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;
}
int /*long*/ gtk_realize (int /*long*/ widget) {
int /*long*/ result = super.gtk_realize (widget);
if (result != 0) return result;
/*
* Bug in GTK. When a progress bar has been unrealized after being
* realized at least once, gtk_progress_bar_set_fraction() GP's. The
* fix is to update the progress bar state only when realized and restore
* the state when the progress bar becomes realized.
*/
updateBar (selection, minimum, maximum);
return 0;
}
void releaseWidget () {
super.releaseWidget ();
if (timerId != 0) OS.gtk_timeout_remove (timerId);
timerId = 0;
}
/**
* 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);
updateBar (selection, minimum, 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);
updateBar (selection, minimum, maximum);
}
/**
* 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));
updateBar (selection, minimum, maximum);
}
int /*long*/ timerProc (int /*long*/ widget) {
if (isVisible ()) OS.gtk_progress_bar_pulse (handle);
return 1;
}
void updateBar (int selection, int minimum, int maximum) {
/*
* Bug in GTK. When a progress bar has been unrealized after being
* realized at least once, gtk_progress_bar_set_fraction() GP's. The
* fix is to update the progress bar state only when realized and restore
* the state when the progress bar becomes realized.
*/
if ((OS.GTK_WIDGET_FLAGS (handle) & OS.GTK_REALIZED) == 0) return;
double fraction = minimum == maximum ? 1 : (double)(selection - minimum) / (maximum - minimum);
OS.gtk_progress_bar_set_fraction (handle, fraction);
/*
* 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.
*/
OS.gdk_flush ();
int /*long*/ window = paintWindow ();
OS.gdk_window_process_updates (window, false);
}
}
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