| package org.eclipse.swt.widgets;
|
|
|
| /*
|
| * Copyright (c) 2000, 2002 IBM Corp. All rights reserved. |
| * This file is made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html
|
| */
|
|
|
| import org.eclipse.swt.internal.motif.*;
|
| import org.eclipse.swt.*;
|
| import org.eclipse.swt.events.*;
|
| import org.eclipse.swt.graphics.*;
|
|
|
| /** |
| * Instances of the receiver represent a selectable user |
| * interface object that present a range of continuous |
| * numeric values. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>HORIZONTAL, VERTICAL</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>Selection</dd> |
| * </dl> |
| * <p> |
| * Note: Only one of the styles HORIZONTAL and VERTICAL may be specified. |
| * </p><p> |
| * <p> |
| * IMPORTANT: This class is intended to be subclassed <em>only</em> |
| * within the SWT implementation. |
| * </p> |
| */ |
| public class Scale extends Control {
|
| /** |
| * 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#HORIZONTAL |
| * @see SWT#VERTICAL |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Scale (Composite parent, int style) {
|
| super (parent, checkStyle (style));
|
| }
|
|
|
| /**
|
| * Adds the listener to the collection of listeners who will
|
| * be notified when the receiver's value changes, by sending
|
| * it one of the messages defined in the <code>SelectionListener</code>
|
| * interface.
|
| *
|
| * @param listener the listener which should be notified
|
| *
|
| * @exception IllegalArgumentException <ul>
|
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
|
| * </ul>
|
| * @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>
|
| *
|
| * @see SelectionListener
|
| * @see #removeSelectionListener
|
| */ |
| public void addSelectionListener(SelectionListener listener) {
|
| checkWidget();
|
| if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
|
| TypedListener typedListener = new TypedListener(listener);
|
| addListener(SWT.Selection,typedListener);
|
| addListener(SWT.DefaultSelection,typedListener);
|
| }
|
| static int checkStyle (int style) {
|
| return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
|
| }
|
| public Point computeSize (int wHint, int hHint, boolean changed) {
|
| checkWidget();
|
| int border = getBorderWidth ();
|
| int width = border * 2, height = border * 2;
|
| Display display = getDisplay ();
|
| int hScroll = display.scrolledMarginX;
|
| int vScroll = display.scrolledMarginY;
|
| if ((style & SWT.HORIZONTAL) != 0) {
|
| width += hScroll * 10;
|
| height += vScroll;
|
| } else {
|
| width += hScroll;
|
| height += vScroll * 10;
|
| }
|
| if (wHint != SWT.DEFAULT) width = wHint + (border * 2);
|
| if (hHint != SWT.DEFAULT) height = hHint + (border * 2);
|
| return new Point (width, height);
|
| }
|
| void createHandle (int index) {
|
| state |= HANDLE;
|
| int [] argList = {
|
| OS.XmNtitleString, 0,
|
| OS.XmNborderWidth, (style & SWT.BORDER) != 0 ? 1 : 0,
|
| OS.XmNorientation, ((style & SWT.H_SCROLL) != 0) ? OS.XmHORIZONTAL : OS.XmVERTICAL,
|
| OS.XmNprocessingDirection, ((style & SWT.H_SCROLL) != 0) ? OS.XmMAX_ON_RIGHT : OS.XmMAX_ON_BOTTOM,
|
| OS.XmNancestorSensitive, 1,
|
| };
|
| int parentHandle = parent.handle;
|
| handle = OS.XmCreateScale (parentHandle, null, argList, argList.length / 2);
|
| if (handle == 0) error (SWT.ERROR_NO_HANDLES);
|
| }
|
| /**
|
| * Returns the amount that the receiver's value will be
|
| * modified by when the up/down (or right/left) arrows
|
| * are pressed.
|
| *
|
| * @return the increment
|
| *
|
| * @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 getIncrement () {
|
| checkWidget();
|
| return 1;
|
| }
|
| /**
|
| * 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();
|
| int [] argList = {OS.XmNmaximum, 0};
|
| OS.XtGetValues (handle, argList, argList.length / 2);
|
| return argList [1];
|
| }
|
| /**
|
| * 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();
|
| int [] argList = {OS.XmNminimum, 0};
|
| OS.XtGetValues (handle, argList, argList.length / 2);
|
| return argList [1];
|
| }
|
| /**
|
| * Returns the amount that the receiver's value will be
|
| * modified by when the page increment/decrement areas
|
| * are selected.
|
| *
|
| * @return the page increment
|
| *
|
| * @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 getPageIncrement () {
|
| checkWidget();
|
| int [] argList = {OS.XmNscaleMultiple, 0};
|
| OS.XtGetValues (handle, argList, argList.length / 2);
|
| return argList [1];
|
| }
|
| /**
|
| * 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();
|
| int [] argList = {OS.XmNvalue, 0};
|
| OS.XtGetValues (handle, argList, argList.length / 2);
|
| return argList [1];
|
| }
|
| void hookEvents () {
|
| super.hookEvents ();
|
| int windowProc = getDisplay ().windowProc;
|
| OS.XtAddCallback (handle, OS.XmNvalueChangedCallback, windowProc, SWT.Selection);
|
| OS.XtAddCallback (handle, OS.XmNdragCallback, windowProc, SWT.Selection);
|
| }
|
| void overrideTranslations () {
|
| Display display = getDisplay ();
|
| OS.XtOverrideTranslations (handle, display.tabTranslations);
|
| }
|
| /**
|
| * Removes the listener from the collection of listeners who will
|
| * be notified when the receiver's value changes.
|
| *
|
| * @param listener the listener which should no longer be notified
|
| *
|
| * @exception IllegalArgumentException <ul>
|
| * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
|
| * </ul>
|
| * @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>
|
| *
|
| * @see SelectionListener
|
| * @see #addSelectionListener
|
| */ |
| public void removeSelectionListener(SelectionListener listener) {
|
| checkWidget();
|
| if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
|
| if (eventTable == null) return;
|
| eventTable.unhook(SWT.Selection, listener);
|
| eventTable.unhook(SWT.DefaultSelection,listener);
|
| }
|
| /**
|
| * Sets the amount that the receiver's value will be
|
| * modified by when the up/down (or right/left) arrows
|
| * are pressed to the argument, which must be at least
|
| * one.
|
| *
|
| * @param value the new increment (must be greater than zero)
|
| *
|
| * @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 setIncrement (int increment) {
|
| checkWidget();
|
| }
|
| /**
|
| * 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 value) {
|
| checkWidget();
|
| if (value < 0) return;
|
| int [] argList = {OS.XmNmaximum, value};
|
| Display display = getDisplay ();
|
| boolean warnings = display.getWarnings ();
|
| display.setWarnings (false);
|
| OS.XtSetValues (handle, argList, argList.length / 2);
|
| display.setWarnings (warnings);
|
| }
|
| /**
|
| * 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 value) {
|
| checkWidget();
|
| if (value < 0) return;
|
| int [] argList = {OS.XmNminimum, value};
|
| Display display = getDisplay ();
|
| boolean warnings = display.getWarnings ();
|
| display.setWarnings (false);
|
| OS.XtSetValues (handle, argList, argList.length / 2);
|
| display.setWarnings (warnings);
|
| }
|
| /**
|
| * Sets the amount that the receiver's value will be
|
| * modified by when the page increment/decrement areas
|
| * are selected to the argument, which must be at least
|
| * one.
|
| *
|
| * @return the page increment (must be greater than zero)
|
| *
|
| * @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 setPageIncrement (int pageIncrement) {
|
| checkWidget();
|
| if (pageIncrement < 1) return;
|
| int [] argList = {OS.XmNscaleMultiple, pageIncrement};
|
| Display display = getDisplay ();
|
| boolean warnings = display.getWarnings ();
|
| display.setWarnings (false);
|
| OS.XtSetValues (handle, argList, argList.length / 2);
|
| display.setWarnings (warnings);
|
| }
|
| /**
|
| * Sets the single <em>selection</em> that is the receiver's
|
| * value 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 selection) {
|
| checkWidget();
|
| if (selection < 0) return;
|
| int [] argList = {OS.XmNvalue, selection};
|
| Display display = getDisplay ();
|
| boolean warnings = display.getWarnings ();
|
| display.setWarnings (false);
|
| OS.XtSetValues (handle, argList, argList.length / 2);
|
| display.setWarnings (warnings);
|
| }
|
| }
|