| 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 (); |
| } |
| |
| } |