/*******************************************************************************
* Copyright (c) 2000, 2011 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.internal.motif.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.events.*;
/**
* 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:
* <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>
* 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 {
Scrollable parent;
boolean dragSent = false;
ScrollBar () {
/* Do Nothing */
}
ScrollBar (Scrollable parent, int style) {
super (parent, checkStyle (style));
this.parent = parent;
createWidget (0);
}
/**
* 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);
}
void createHandle (int index) {
int [] argList = {
OS.XmNancestorSensitive, 1,
OS.XmNborderWidth, (style & SWT.BORDER) != 0 ? 1 : 0,
OS.XmNorientation, ((style & SWT.H_SCROLL) != 0) ? OS.XmHORIZONTAL : OS.XmVERTICAL,
OS.XmNtraversalOn, 0,
};
int parentHandle = parent.scrolledHandle;
handle = OS.XmCreateScrollBar (parentHandle, null, argList, argList.length / 2);
if (handle == 0) error (SWT.ERROR_NO_HANDLES);
}
void destroyHandle () {
super.destroyWidget ();
}
void destroyWidget () {
parent.destroyScrollBar (this);
releaseHandle ();
//parent.sendEvent (SWT.Resize);
}
/**
* 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();
int [] argList = {OS.XmNsensitive, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
return argList [1] != 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();
int [] argList = {OS.XmNincrement, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
return argList [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.XmNpageIncrement, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
return argList [1];
}
/**
* 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();
int [] argList = {OS.XmNvalue, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
return argList [1];
}
/**
* 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();
int [] argList = {OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
int borders = argList [5] * 2;
return new Point (argList [1] + borders, argList [3] + borders);
}
/**
* 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();
int [] argList = {OS.XmNsliderSize, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
return argList [1];
}
/**
* 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();
int [] argList = {
OS.XmNsliderSize, 0, //1
OS.XmNwidth, 0, //3
OS.XmNheight, 0, //5
OS.XmNminimum, 0, //7
OS.XmNmaximum, 0, //9
OS.XmNvalue, 0, //11
};
OS.XtGetValues (handle, argList, argList.length / 2);
Rectangle rect;
if ((style & SWT.VERTICAL) != 0) {
int slideSize = argList [5], sliderSize, sliderPos;
if (slideSize > 2 * argList [3]) {
slideSize -= 2 * argList [3];
float factor = (float)slideSize / (argList[9] - argList[7]);
sliderSize = (int)(0.5f + argList[1] * factor);
sliderPos = (int) (((argList[11] - argList[7]) * factor) + 0.5) + argList [3];
} else {
sliderPos = slideSize / 2;
sliderSize = 0;
}
rect = new Rectangle(0, sliderPos, argList[3], sliderSize);
} else {
int slideSize = argList [3], sliderSize, sliderPos;
if (slideSize > 2 * argList [5]) {
slideSize -= 2 * argList [5];
float factor = (float)slideSize / (argList[9] - argList[7]);
sliderSize = (int)(0.5f + argList[1] * factor);
sliderPos = (int) (((argList[11] - argList[7]) * factor) + 0.5) + argList [5];
} else {
sliderPos = slideSize / 2;
sliderSize = 0;
}
rect = new Rectangle(sliderPos, 0, sliderSize, argList[5]);
}
short [] root_x = new short [1], root_y = new short [1];
OS.XtTranslateCoords (handle, (short) rect.x, (short) rect.y, root_x, root_y);
rect.x = root_x [0];
rect.y = root_y [0];
OS.XtTranslateCoords (parent.handle, (short) 0, (short) 0, root_x, root_y);
rect.x -= root_x [0];
rect.y -= root_y [0];
return rect;
}
/**
* 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();
int [] argList = {
OS.XmNwidth, 0, //1
OS.XmNheight, 0, //3
};
OS.XtGetValues (handle, argList, argList.length / 2);
Rectangle rect;
if ((style & SWT.VERTICAL) != 0) {
int slideSize = argList [3], slidePos;
if (slideSize > 2 * argList [1]) {
slidePos = argList [1];
slideSize -= 2 * (argList [1]);
} else {
slidePos = slideSize / 2;
slideSize = 0;
}
rect = new Rectangle(0, slidePos, argList[1], slideSize);
} else {
int slideSize = argList [1], slidePos;
if (slideSize > 2 * argList [3]) {
slidePos = argList [3];
slideSize -= 2 * (argList [3]);
} else {
slidePos = slideSize / 2;
slideSize = 0;
}
rect = new Rectangle(slidePos, 0, slideSize, argList[3]);
}
short [] root_x = new short [1], root_y = new short [1];
OS.XtTranslateCoords (handle, (short) rect.x, (short) rect.y, root_x, root_y);
rect.x = root_x [0];
rect.y = root_y [0];
OS.XtTranslateCoords (parent.handle, (short) 0, (short) 0, root_x, root_y);
rect.x -= root_x [0];
rect.y -= root_y [0];
return rect;
}
/**
* 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 OS.XtIsManaged (handle);
}
void hookEvents () {
int windowProc = display.windowProc;
OS.XtAddCallback (handle, OS.XmNvalueChangedCallback, windowProc, VALUE_CHANGED_CALLBACK);
OS.XtAddCallback (handle, OS.XmNdragCallback, windowProc, DRAG_CALLBACK);
OS.XtAddCallback (handle, OS.XmNtoBottomCallback, windowProc, TO_BOTTOM_CALLBACK);
OS.XtAddCallback (handle, OS.XmNtoTopCallback, windowProc, TO_TOP_CALLBACK);
OS.XtAddCallback (handle, OS.XmNincrementCallback, windowProc, INCREMENT_CALLBACK);
OS.XtAddCallback (handle, OS.XmNdecrementCallback, windowProc, DECREMENT_CALLBACK);
OS.XtAddCallback (handle, OS.XmNpageIncrementCallback, windowProc, PAGE_INCREMENT_CALLBACK);
OS.XtAddCallback (handle, OS.XmNpageDecrementCallback, windowProc, PAGE_DECREMENT_CALLBACK);
OS.XtAddEventHandler (handle, OS.ButtonPressMask, false, windowProc, BUTTON_PRESS);
}
/**
* 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 ();
}
/**
* 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 ();
}
void manageChildren () {
/*
* Feature in Motif. Hiding or showing a scroll bar
* can cause the widget to automatically resize in
* the OS. This behavior is unwanted. The fix is
* to force the widget to resize to original size.
*/
int scrolledHandle = parent.scrolledHandle;
int [] argList = {OS.XmNwidth, 0, OS.XmNheight, 0, OS.XmNborderWidth, 0};
if (scrolledHandle != 0) {
OS.XtGetValues (scrolledHandle, argList, argList.length / 2);
}
OS.XtManageChild (handle);
/*
* Feature in Motif. When XtSetValues() is used to restore the width and
* height of the widget, the new width and height are sometimes ignored.
* The fix is to use XtResizeWidget().
*/
if (scrolledHandle != 0) {
OS.XtResizeWidget (scrolledHandle, argList [1], argList [3], argList [5]);
}
}
void propagateWidget (boolean enabled) {
propagateHandle (enabled, handle, OS.None);
}
void releaseHandle () {
super.releaseHandle ();
parent = null;
}
void releaseParent () {
super.releaseParent ();
if (parent.horizontalBar == this) parent.horizontalBar = null;
if (parent.verticalBar == this) parent.verticalBar = null;
}
/**
* 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);
}
void sendScrollEvent (int detail) {
Event event = new Event ();
event.detail = detail;
sendEvent (SWT.Selection, event);
/*
* Feature in Motif. When a scroll bar is selected,
* it does not make the shell active. The fix is to
* make the shell active.
*/
Shell shell = parent.getShell ();
shell.bringToTop (true);
}
/**
* 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();
int [] argList = {OS.XmNsensitive, enabled ? 1 : 0};
OS.XtSetValues (handle, argList, argList.length / 2);
}
/**
* 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;
int [] argList = {OS.XmNincrement, value};
OS.XtSetValues (handle, argList, argList.length / 2);
}
/**
* 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;
int [] argList = {OS.XmNmaximum, value};
boolean warnings = display.getWarnings ();
display.setWarnings (false);
OS.XtSetValues (handle, argList, argList.length / 2);
display.setWarnings (warnings);
}
/**
* 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;
int [] argList = {
OS.XmNminimum, 0,
OS.XmNmaximum, 0,
OS.XmNsliderSize, 0,
};
/*
* Feature in Motif. For some reason, when minimium
* is set to be greater than or equal to maximum, Motif
* does not set the minimum. Instead, the value is
* changed and the minimum stays the same. This behavior
* differs from setting the maximum where the slider size
* is always decreased to make room for the new maximum.
* The fix is to decrease the slider to make room for
* the new minimum.
*/
OS.XtGetValues (handle, argList, argList.length / 2);
if (argList [3] - value - argList [5] < 0) {
argList [5] = argList [3] - value;
}
argList [1] = value;
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.
*
* @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;
int [] argList = {OS.XmNpageIncrement, value};
OS.XtSetValues (handle, argList, argList.length / 2);
}
/**
* 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();
int [] argList = {OS.XmNvalue, selection};
boolean warnings = display.getWarnings ();
display.setWarnings (false);
OS.XtSetValues (handle, argList, argList.length / 2);
display.setWarnings (warnings);
}
/**
* 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;
int [] argList = {OS.XmNminimum, 0, OS.XmNmaximum, 0};
OS.XtGetValues (handle, argList, argList.length / 2);
value = Math.min (value, argList [3] - argList [1]);
int [] argList2 = {OS.XmNsliderSize, value};
boolean warnings = display.getWarnings ();
display.setWarnings (false);
OS.XtSetValues (handle, argList2, argList2.length / 2);
display.setWarnings (warnings);
}
/**
* 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;
thumb = Math.min (thumb, maximum - minimum);
int [] argList = {
OS.XmNvalue, selection,
OS.XmNminimum, minimum,
OS.XmNmaximum, maximum,
OS.XmNsliderSize, thumb,
OS.XmNincrement, increment,
OS.XmNpageIncrement, pageIncrement,
};
boolean warnings = display.getWarnings ();
display.setWarnings (false);
OS.XtSetValues (handle, argList, argList.length / 2);
display.setWarnings (warnings);
}
/**
* 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();
if (parent.setScrollBarVisible (this, visible)) {
sendEvent (visible ? SWT.Show : SWT.Hide);
parent.sendEvent (SWT.Resize);
}
}
int XButtonPress (int w, int client_data, int call_data, int continue_to_dispatch) {
int result = super.XButtonPress (w, client_data, call_data, continue_to_dispatch);
if (result != 0) return result;
dragSent = false;
return result;
}
int XmNdecrementCallback (int w, int client_data, int call_data) {
sendScrollEvent (SWT.ARROW_UP);
return 0;
}
int XmNdragCallback (int w, int client_data, int call_data) {
dragSent = true;
sendScrollEvent (SWT.DRAG);
return 0;
}
int XmNincrementCallback (int w, int client_data, int call_data) {
sendScrollEvent (SWT.ARROW_DOWN);
return 0;
}
int XmNpageDecrementCallback (int w, int client_data, int call_data) {
sendScrollEvent (SWT.PAGE_UP);
return 0;
}
int XmNpageIncrementCallback (int w, int client_data, int call_data) {
sendScrollEvent (SWT.PAGE_DOWN);
return 0;
}
int XmNtoBottomCallback (int w, int client_data, int call_data) {
sendScrollEvent (SWT.END);
return 0;
}
int XmNtoTopCallback (int w, int client_data, int call_data) {
sendScrollEvent (SWT.HOME);
return 0;
}
int XmNvalueChangedCallback (int w, int client_data, int call_data) {
if (!dragSent){
sendScrollEvent (SWT.DRAG);
dragSent = false;
}
sendScrollEvent (SWT.NONE);
return 0;
}
}