| /******************************************************************************* |
| * Copyright (c) 2000, 2009 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.graphics.*; |
| import org.eclipse.swt.internal.wpf.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.events.*; |
| |
| /** |
| * 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 <em>not</em> intended to be subclassed. |
| * </p> |
| * |
| * @see <a href="http://www.eclipse.org/swt/snippets/#scale">Scale snippets</a> |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| * @noextend This class is not intended to be subclassed by clients. |
| */ |
| |
| 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 user changes the receiver's value, by sending |
| * it one of the messages defined in the <code>SelectionListener</code> |
| * interface. |
| * <p> |
| * <code>widgetSelected</code> is called when the user changes the receiver's value. |
| * <code>widgetDefaultSelected</code> is not called. |
| * </p> |
| * |
| * @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; |
| if ((style & SWT.HORIZONTAL) != 0) { |
| width += OS.SystemParameters_HorizontalScrollBarButtonWidth () * 10; |
| height += OS.SystemParameters_HorizontalScrollBarHeight () * 2; |
| } else { |
| width += OS.SystemParameters_VerticalScrollBarWidth () * 2; |
| height += OS.SystemParameters_VerticalScrollBarButtonHeight () * 10; |
| } |
| if (wHint != SWT.DEFAULT) width = wHint + (border * 2); |
| if (hHint != SWT.DEFAULT) height = hHint + (border * 2); |
| return new Point (width, height); |
| } |
| |
| void createHandle () { |
| state |= THEME_BACKGROUND; |
| handle = OS.gcnew_Slider (); |
| if (handle == 0) error (SWT.ERROR_NO_HANDLES); |
| if ((style & SWT.VERTICAL) != 0) OS.Slider_Orientation (handle, OS.Orientation_Vertical); |
| OS.RangeBase_Maximum (handle, 100); |
| OS.RangeBase_LargeChange (handle, 10); |
| OS.RangeBase_SmallChange (handle, 1); |
| OS.Slider_TickFrequency (handle, 10); |
| OS.Slider_TickPlacement (handle, OS.TickPlacement_Both); |
| } |
| |
| int defaultBackground () { |
| return OS.SystemColors_ControlColor; |
| } |
| |
| /** |
| * 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 (int) OS.RangeBase_SmallChange (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 (int) OS.RangeBase_Maximum (handle); |
| } |
| |
| /** |
| * 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 (int) OS.RangeBase_Minimum (handle); |
| } |
| |
| /** |
| * 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 (); |
| return (int) OS.RangeBase_LargeChange(handle); |
| } |
| |
| /** |
| * Returns the 'selection', which 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 (int) OS.RangeBase_Value (handle); |
| } |
| |
| void HandleValueChanged (int sender, int e) { |
| if (!checkEvent (e)) return; |
| postEvent (SWT.Selection); |
| } |
| |
| void hookEvents() { |
| super.hookEvents (); |
| int handler = OS.gcnew_RoutedPropertyChangedEventHandler (jniRef, "HandleValueChanged"); |
| if (handler == 0) error (SWT.ERROR_NO_HANDLES); |
| OS.RangeBase_ValueChanged (handle, handler); |
| OS.GCHandle_Free (handler); |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the user changes the receiver's value. |
| * |
| * @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 increment 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 (); |
| if (increment < 1) return; |
| int minimum = (int) OS.RangeBase_Minimum(handle); |
| int maximum = (int) OS.RangeBase_Maximum(handle); |
| if (increment > maximum - minimum) return; |
| OS.RangeBase_SmallChange(handle, increment); |
| } |
| |
| /** |
| * 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 (); |
| int minimum = (int) OS.RangeBase_Minimum (handle); |
| if (0 <= minimum && minimum < value) OS.RangeBase_Maximum (handle, value); |
| } |
| |
| /** |
| * 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 (); |
| int maximum = (int) OS.RangeBase_Maximum (handle); |
| if (0 <= value && value < maximum) OS.RangeBase_Minimum (handle, value); |
| } |
| |
| /** |
| * 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. |
| * |
| * @param pageIncrement 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 minimum = (int) OS.RangeBase_Minimum(handle); |
| int maximum = (int) OS.RangeBase_Maximum(handle); |
| if (pageIncrement > maximum - minimum) return; |
| OS.RangeBase_LargeChange(handle, pageIncrement); |
| OS.Slider_TickFrequency(handle, pageIncrement); |
| } |
| |
| /** |
| * Sets the 'selection', which 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 value) { |
| checkWidget (); |
| OS.RangeBase_Value (handle, value); |
| } |
| |
| } |