| /******************************************************************************* |
| * Copyright (c) 2000, 2012 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.widgets; |
| |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.events.*; |
| import org.eclipse.swt.graphics.*; |
| import org.eclipse.swt.internal.cocoa.*; |
| |
| /** |
| * Instances of this class are selectable user interface |
| * objects that represent a range of positive, numeric values. |
| * <p> |
| * At any given moment, a given scroll bar will have a |
| * single 'selection' that is considered to be its |
| * value, which is constrained to be within the range of |
| * values the scroll bar represents (that is, between its |
| * <em>minimum</em> and <em>maximum</em> values). |
| * </p><p> |
| * Typically, scroll bars will be made up of five areas:</p> |
| * <ol> |
| * <li>an arrow button for decrementing the value</li> |
| * <li>a page decrement area for decrementing the value by a larger amount</li> |
| * <li>a <em>thumb</em> for modifying the value by mouse dragging</li> |
| * <li>a page increment area for incrementing the value by a larger amount</li> |
| * <li>an arrow button for incrementing the value</li> |
| * </ol> |
| * <p> |
| * Based on their style, scroll bars are either <code>HORIZONTAL</code> |
| * (which have a left facing button for decrementing the value and a |
| * right facing button for incrementing it) or <code>VERTICAL</code> |
| * (which have an upward facing button for decrementing the value |
| * and a downward facing buttons for incrementing it). |
| * </p><p> |
| * On some platforms, the size of the scroll bar's thumb can be |
| * varied relative to the magnitude of the range of values it |
| * represents (that is, relative to the difference between its |
| * maximum and minimum values). Typically, this is used to |
| * indicate some proportional value such as the ratio of the |
| * visible area of a document to the total amount of space that |
| * it would take to display it. SWT supports setting the thumb |
| * size even if the underlying platform does not, but in this |
| * case the appearance of the scroll bar will not change. |
| * </p><p> |
| * Scroll bars are created by specifying either <code>H_SCROLL</code>, |
| * <code>V_SCROLL</code> or both when creating a <code>Scrollable</code>. |
| * They are accessed from the <code>Scrollable</code> using |
| * <code>getHorizontalBar</code> and <code>getVerticalBar</code>. |
| * </p><p> |
| * Note: Scroll bars are not Controls. On some platforms, scroll bars |
| * that appear as part of some standard controls such as a text or list |
| * have no operating system resources and are not children of the control. |
| * For this reason, scroll bars are treated specially. To create a control |
| * that looks like a scroll bar but has operating system resources, use |
| * <code>Slider</code>. |
| * </p> |
| * <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> |
| * IMPORTANT: This class is <em>not</em> intended to be subclassed. |
| * </p> |
| * |
| * @see Slider |
| * @see Scrollable |
| * @see Scrollable#getHorizontalBar |
| * @see Scrollable#getVerticalBar |
| * @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 ScrollBar extends Widget { |
| NSScroller view; |
| Scrollable parent; |
| int minimum, maximum = 100, thumb = 10; |
| int increment = 1; |
| int pageIncrement = 10; |
| id target; |
| long actionSelector; |
| |
| ScrollBar () { |
| /* Do nothing */ |
| } |
| |
| /** |
| * 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> |
| * When <code>widgetSelected</code> is called, the event object detail field contains one of the following values: |
| * <code>SWT.NONE</code> - for the end of a drag. |
| * <code>SWT.DRAG</code>. |
| * <code>SWT.HOME</code>. |
| * <code>SWT.END</code>. |
| * <code>SWT.ARROW_DOWN</code>. |
| * <code>SWT.ARROW_UP</code>. |
| * <code>SWT.PAGE_DOWN</code>. |
| * <code>SWT.PAGE_UP</code>. |
| * <code>widgetDefaultSelected</code> is not called. |
| * </p> |
| * |
| * @param listener the listener which should be notified when the user changes the receiver's value |
| * |
| * @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 |
| * @see SelectionEvent |
| */ |
| 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); |
| } |
| |
| @Override |
| void deregister () { |
| super.deregister (); |
| display.removeWidget (view); |
| } |
| |
| @Override |
| boolean getDrawing () { |
| return parent.getDrawing (); |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver is enabled, and |
| * <code>false</code> otherwise. A disabled control is typically |
| * not selectable from the user interface and draws with an |
| * inactive or "grayed" look. |
| * |
| * @return the receiver's enabled state |
| * |
| * @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 #isEnabled |
| */ |
| public boolean getEnabled () { |
| checkWidget(); |
| return (state & DISABLED) == 0; |
| } |
| |
| /** |
| * 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 increment; |
| } |
| |
| /** |
| * 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 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 pageIncrement; |
| } |
| |
| /** |
| * Returns the receiver's parent, which must be a Scrollable. |
| * |
| * @return the receiver's parent |
| * |
| * @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 Scrollable getParent () { |
| checkWidget (); |
| return parent; |
| } |
| |
| /** |
| * Returns the single 'selection' that is the receiver's value. |
| * |
| * @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(); |
| NSScroller widget = (NSScroller)view; |
| double value = widget.doubleValue(); |
| return (int)(0.5f + ((maximum - thumb - minimum) * value + minimum)); |
| } |
| |
| /** |
| * Returns a point describing the receiver's size. The |
| * x coordinate of the result is the width of the receiver. |
| * The y coordinate of the result is the height of the |
| * receiver. |
| * |
| * @return the receiver's size |
| * |
| * @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 Point getSize () { |
| checkWidget(); |
| NSRect rect = ((NSScroller)view).frame(); |
| return new Point((int)rect.width, (int)rect.height); |
| } |
| |
| /** |
| * Returns the receiver's thumb value. |
| * |
| * @return the thumb value |
| * |
| * @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 ScrollBar |
| */ |
| public int getThumb () { |
| checkWidget(); |
| return thumb; |
| } |
| |
| /** |
| * Returns a rectangle describing the size and location of the |
| * receiver's thumb relative to its parent. |
| * |
| * @return the thumb bounds, relative to the {@link #getParent() parent} |
| * |
| * @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> |
| * |
| * @since 3.6 |
| */ |
| public Rectangle getThumbBounds () { |
| checkWidget(); |
| NSRect rect = view.rectForPart(OS.NSScrollerKnob); |
| rect = view.convertRect_toView_(rect, parent.view); |
| return new Rectangle((int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height); |
| } |
| |
| /** |
| * Returns a rectangle describing the size and location of the |
| * receiver's thumb track relative to its parent. This rectangle |
| * comprises the areas 2, 3, and 4 as described in {@link ScrollBar}. |
| * |
| * @return the thumb track bounds, relative to the {@link #getParent() parent} |
| * |
| * @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> |
| * |
| * @since 3.6 |
| */ |
| public Rectangle getThumbTrackBounds () { |
| checkWidget(); |
| NSRect rect = view.rectForPart(OS.NSScrollerKnobSlot); |
| rect = view.convertRect_toView_(rect, parent.view); |
| return new Rectangle((int)rect.x, (int)rect.y, (int)rect.width, (int)rect.height); |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver is visible, and |
| * <code>false</code> otherwise. |
| * <p> |
| * If one of the receiver's ancestors is not visible or some |
| * other condition makes the receiver not visible, this method |
| * may still indicate that it is considered visible even though |
| * it may not actually be showing. |
| * </p> |
| * |
| * @return the receiver's visibility state |
| * |
| * @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 boolean getVisible () { |
| checkWidget(); |
| return (state & HIDDEN) == 0 && !view.isHidden(); |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver is enabled and all |
| * of the receiver's ancestors are enabled, and <code>false</code> |
| * otherwise. A disabled control is typically not selectable from the |
| * user interface and draws with an inactive or "grayed" look. |
| * |
| * @return the receiver's enabled state |
| * |
| * @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 #getEnabled |
| */ |
| public boolean isEnabled () { |
| checkWidget(); |
| return getEnabled () && parent.isEnabled (); |
| } |
| |
| @Override |
| boolean isDrawing () { |
| return getDrawing() && parent.isDrawing (); |
| } |
| |
| /** |
| * Returns <code>true</code> if the receiver is visible and all |
| * of the receiver's ancestors are visible and <code>false</code> |
| * otherwise. |
| * |
| * @return the receiver's visibility state |
| * |
| * @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 #getVisible |
| */ |
| public boolean isVisible () { |
| checkWidget(); |
| return getVisible () && parent.isVisible (); |
| } |
| |
| /** |
| * 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); |
| } |
| |
| @Override |
| void register () { |
| super.register (); |
| display.addWidget (view, this); |
| } |
| |
| @Override |
| void releaseHandle () { |
| super.releaseHandle (); |
| if (view != null) view.release(); |
| view = null; |
| } |
| |
| @Override |
| void releaseParent () { |
| super.releaseParent (); |
| if (parent.horizontalBar == this) parent.horizontalBar = null; |
| if (parent.verticalBar == this) parent.verticalBar = null; |
| } |
| |
| @Override |
| void releaseWidget () { |
| super.releaseWidget (); |
| parent = null; |
| } |
| |
| @Override |
| void sendSelection () { |
| NSWindow window = view.window (); |
| if (target == null) parent.getShell().deferFlushing(); |
| int value = 0; |
| if (target != null) { |
| view.sendAction(actionSelector, target); |
| } else { |
| value = getSelection (); |
| } |
| NSPoint point; |
| NSEvent nsEvent = NSApplication.sharedApplication().currentEvent(); |
| if (nsEvent != null) { |
| point = nsEvent.locationInWindow(); |
| if (nsEvent.window() == null) point = window.convertScreenToBase(point); |
| } else { |
| point = window.mouseLocationOutsideOfEventStream(); |
| } |
| int hitPart = (int)((NSScroller)view).testPart(point); |
| Event event = new Event(); |
| switch (hitPart) { |
| case OS.NSScrollerDecrementLine: |
| value -= increment; |
| event.detail = SWT.ARROW_UP; |
| break; |
| case OS.NSScrollerDecrementPage: |
| value -= pageIncrement; |
| event.detail = SWT.PAGE_UP; |
| break; |
| case OS.NSScrollerIncrementLine: |
| value += increment; |
| event.detail = SWT.ARROW_DOWN; |
| break; |
| case OS.NSScrollerIncrementPage: |
| value += pageIncrement; |
| event.detail = SWT.PAGE_DOWN; |
| break; |
| case OS.NSScrollerKnob: |
| event.detail = SWT.DRAG; |
| break; |
| } |
| if (target == null) { |
| if (event.detail != SWT.DRAG) { |
| setSelection(value); |
| } |
| } |
| sendSelectionEvent(SWT.Selection, event, true); |
| } |
| |
| /** |
| * 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 value) { |
| checkWidget(); |
| if (value < 1) return; |
| increment = value; |
| } |
| |
| @Override |
| void setClipRegion (NSView view) { |
| parent.setClipRegion(view); |
| } |
| |
| /** |
| * Enables the receiver if the argument is <code>true</code>, |
| * and disables it otherwise. A disabled control is typically |
| * not selectable from the user interface and draws with an |
| * inactive or "grayed" look. |
| * |
| * @param enabled the new enabled state |
| * |
| * @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 setEnabled (boolean enabled) { |
| checkWidget(); |
| if (enabled) { |
| if ((state & DISABLED) == 0) return; |
| state &= ~DISABLED; |
| } else { |
| if ((state & DISABLED) != 0) return; |
| state |= DISABLED; |
| } |
| enableWidget (enabled); |
| } |
| |
| void enableWidget (boolean enabled) { |
| if (!enabled || (state & DISABLED) == 0) { |
| view.setEnabled (enabled); |
| } |
| } |
| |
| /** |
| * Sets the maximum. If this value is negative or less than or |
| * equal to the minimum, the value is ignored. If necessary, first |
| * the thumb and then the selection are adjusted to fit within the |
| * new range. |
| * |
| * @param value the new 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 setMaximum (int value) { |
| checkWidget(); |
| if (value < 0) return; |
| if (value <= minimum) return; |
| if (value - minimum < thumb) { |
| thumb = value - minimum; |
| } |
| int selection = Math.max(minimum, Math.min (getSelection (), value - thumb)); |
| this.maximum = value; |
| updateBar(selection, minimum, value, thumb); |
| } |
| |
| /** |
| * Sets the minimum value. If this value is negative or greater |
| * than or equal to the maximum, the value is ignored. If necessary, |
| * first the thumb and then the selection are adjusted to fit within |
| * the new range. |
| * |
| * @param value the new 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 setMinimum (int value) { |
| checkWidget(); |
| if (value < 0) return; |
| if (value >= maximum) return; |
| if (maximum - value < thumb) { |
| thumb = maximum - value; |
| } |
| int selection = Math.min(maximum - thumb, Math.max (getSelection (), value)); |
| this.minimum = value; |
| updateBar(selection, value, maximum, thumb); |
| } |
| |
| /** |
| * 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 value 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 value) { |
| checkWidget(); |
| if (value < 1) return; |
| pageIncrement = value; |
| } |
| |
| /** |
| * 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 selection 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(); |
| updateBar(selection, minimum, maximum, thumb); |
| } |
| |
| /** |
| * Sets the thumb value. The thumb value should be used to represent |
| * the size of the visual portion of the current range. This value is |
| * usually the same as the page increment value. |
| * <p> |
| * This new value will be ignored if it is less than one, and will be |
| * clamped if it exceeds the receiver's current range. |
| * </p> |
| * |
| * @param value the new thumb value, which must be at least one and not |
| * larger than the size of the current range |
| * |
| * @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 setThumb (int value) { |
| checkWidget(); |
| if (value < 1) return; |
| value = Math.min (value, maximum - minimum); |
| updateBar(getSelection(), minimum, maximum, value); |
| this.thumb = value; |
| } |
| |
| /** |
| * Sets the receiver's selection, minimum value, maximum |
| * value, thumb, increment and page increment all at once. |
| * <p> |
| * Note: This is similar to setting the values individually |
| * using the appropriate methods, but may be implemented in a |
| * more efficient fashion on some platforms. |
| * </p> |
| * |
| * @param selection the new selection value |
| * @param minimum the new minimum value |
| * @param maximum the new maximum value |
| * @param thumb the new thumb value |
| * @param increment the new increment value |
| * @param pageIncrement the new pageIncrement value |
| * |
| * @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 setValues (int selection, int minimum, int maximum, int thumb, int increment, int pageIncrement) { |
| checkWidget(); |
| if (minimum < 0) return; |
| if (maximum < 0) return; |
| if (thumb < 1) return; |
| if (increment < 1) return; |
| if (pageIncrement < 1) return; |
| this.thumb = thumb = Math.min (thumb, maximum - minimum); |
| this.maximum = maximum; |
| this.minimum = minimum; |
| this.increment = increment; |
| this.pageIncrement = pageIncrement; |
| updateBar (selection, minimum, maximum, thumb); |
| } |
| |
| /** |
| * Marks the receiver as visible if the argument is <code>true</code>, |
| * and marks it invisible otherwise. |
| * <p> |
| * If one of the receiver's ancestors is not visible or some |
| * other condition makes the receiver not visible, marking |
| * it visible may not actually cause it to be displayed. |
| * </p> |
| * |
| * @param visible the new visibility state |
| * |
| * @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 setVisible (boolean visible) { |
| checkWidget(); |
| parent.setScrollBarVisible (this, visible); |
| } |
| |
| void updateBar (int selection, int minimum, int maximum, int thumb) { |
| NSScroller widget = (NSScroller) view; |
| selection = Math.max (minimum, Math.min (maximum - thumb, selection)); |
| int range = maximum - thumb - minimum; |
| float fraction = range <= 0 ? 1 : (float) (selection - minimum) / range; |
| float knob = range <= 0 ? 1 : (float) thumb / (maximum - minimum); |
| double oldFraction = widget.doubleValue(); |
| double oldKnob = widget.knobProportion(); |
| widget.setDoubleValue(fraction); |
| widget.setKnobProportion(knob); |
| widget.setEnabled (range > 0); |
| if (target == null && (knob != oldKnob || fraction != oldFraction)) { |
| OS.objc_msgSend(parent.scrollView.id, OS.sel_flashScrollers); |
| } |
| } |
| |
| } |