/*******************************************************************************
* 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.internal.carbon.CGPoint;
import org.eclipse.swt.internal.carbon.CGRect;
import org.eclipse.swt.internal.carbon.HIThemeTrackDrawInfo;
import org.eclipse.swt.internal.carbon.OS;
import org.eclipse.swt.internal.carbon.Rect;
import org.eclipse.swt.internal.carbon.ScrollBarTrackInfo;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
/**
* 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 {
int handle;
int visibleRgn, oldActionProc;
Scrollable parent;
boolean dragging;
int increment = 1;
int pageIncrement = 10;
ScrollBar () {
/* Do nothing */
}
ScrollBar (Scrollable parent, int style) {
super (parent, checkStyle (style));
this.parent = parent;
createWidget ();
}
/**
* 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);
}
int actionProc (int theControl, int partCode) {
int result = super.actionProc (theControl, partCode);
if (result == OS.noErr) return result;
Event event = new Event ();
int inc = 0;
switch (partCode) {
case OS.kControlUpButtonPart:
inc -= increment;
event.detail = SWT.ARROW_UP;
break;
case OS.kControlPageUpPart:
inc -= pageIncrement;
event.detail = SWT.PAGE_UP;
break;
case OS.kControlPageDownPart:
inc += pageIncrement;
event.detail = SWT.PAGE_DOWN;
break;
case OS.kControlDownButtonPart:
inc += increment;
event.detail = SWT.ARROW_DOWN;
break;
case OS.kControlIndicatorPart:
dragging = true;
event.detail = SWT.DRAG;
break;
default:
return result;
}
if (oldActionProc != 0) {
OS.Call (oldActionProc, theControl, partCode);
parent.redrawBackgroundImage ();
} else {
int value = OS.GetControl32BitValue (handle) + inc;
OS.SetControl32BitValue (handle, value);
}
sendSelectionEvent (SWT.Selection, event, true);
return result;
}
void destroyHandle () {
int theControl = handle;
releaseHandle ();
if (theControl != 0) {
OS.DisposeControl (theControl);
}
}
void destroyWidget () {
parent.destroyScrollBar (this);
releaseHandle ();
//parent.sendEvent (SWT.Resize);
}
void enableWidget (boolean enabled) {
if (enabled) {
OS.EnableControl (handle);
} else {
OS.DisableControl (handle);
}
}
void createHandle () {
int actionProc = display.actionProc;
int [] outControl = new int [1];
int window = OS.GetControlOwner (parent.scrolledHandle);
OS.CreateScrollBarControl (window, null, 0, 0, 90, 10, true, actionProc, outControl);
if (outControl [0] == 0) error (SWT.ERROR_NO_HANDLES);
handle = outControl [0];
}
void createWidget () {
super.createWidget ();
setZOrder ();
}
void deregister () {
super.deregister ();
display.removeWidget (handle);
}
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();
int maximum = OS.GetControl32BitMaximum (handle) & 0x7FFFFFFF;
int viewSize = OS.GetControlViewSize (handle);
return maximum + viewSize;
}
/**
* 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 OS.GetControl32BitMinimum (handle) & 0x7FFFFFFF;
}
/**
* 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();
return OS.GetControl32BitValue (handle) & 0x7FFFFFFF;
}
/**
* 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();
return getControlSize (handle);
}
/**
* 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 OS.GetControlViewSize (handle);
}
/**
* 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 rgnHandle = OS.NewRgn ();
OS.GetControlRegion (handle, (short)OS.kControlIndicatorPart, rgnHandle);
Rect rect = new Rect ();
OS.GetRegionBounds (rgnHandle, rect);
OS.DisposeRgn (rgnHandle);
CGPoint pt = new CGPoint ();
OS.HIViewConvertPoint (pt, handle, parent.handle);
Rectangle result = new Rectangle(rect.left, rect.top, (rect.right - rect.left), (rect.bottom - rect.top));
result.x += (int) pt.x;
result.y += (int) pt.y;
return result;
}
/**
* 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();
HIThemeTrackDrawInfo info = new HIThemeTrackDrawInfo();
info.min = OS.GetControl32BitMinimum (handle);
info.max = OS.GetControl32BitMaximum (handle);
info.value = OS.GetControl32BitValue (handle);
info.kind = OS.kThemeScrollBarMedium;
info.attributes = OS.kThemeTrackShowThumb;
if ((style & SWT.HORIZONTAL) != 0) info.attributes |= OS.kThemeTrackHorizontal;
info.enableState = OS.kThemeTrackActive;
info.scrollbar = new ScrollBarTrackInfo();
info.scrollbar.viewsize = OS.GetControlViewSize (handle);
CGRect rect = new CGRect ();
OS.HIViewGetFrame (handle, rect);
info.bounds_x = rect.x;
info.bounds_y = rect.y;
info.bounds_width = rect.width;
info.bounds_height = rect.height;
OS.HIThemeGetTrackPartBounds(info, (short) OS.kControlPageDownPart, rect);
CGRect rect1 = new CGRect ();
OS.HIThemeGetTrackPartBounds(info, (short) OS.kControlPageUpPart, rect1);
OS.CGRectUnion(rect, rect1, rect);
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;
}
int getVisibleRegion (int control, boolean clipChildren) {
if (visibleRgn == 0) {
visibleRgn = OS.NewRgn ();
calculateVisibleRegion (control, visibleRgn, clipChildren);
}
int result = OS.NewRgn ();
OS.CopyRgn (visibleRgn, result);
return result;
}
void hookEvents () {
super.hookEvents ();
int controlProc = display.controlProc;
int [] mask = new int [] {
OS.kEventClassControl, OS.kEventControlTrack,
};
int controlTarget = OS.GetControlEventTarget (handle);
OS.InstallEventHandler (controlTarget, controlProc, mask.length / 2, mask, handle, null);
if ((parent.state & CANVAS) == 0) {
oldActionProc = OS.GetControlAction (handle);
OS.SetControlAction (handle, display.actionProc);
}
}
void invalidateVisibleRegion (int control) {
resetVisibleRegion (control);
parent.resetVisibleRegion (control);
}
void invalWindowRgn (int window, int rgn) {
parent.invalWindowRgn (window, rgn);
}
boolean isDrawing () {
return getDrawing() && parent.isDrawing();
}
/**
* 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 ();
}
boolean isTrimHandle (int trimHandle) {
return handle == trimHandle;
}
/**
* 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 ();
}
int kEventMouseDown (int nextHandler, int theEvent, int userData) {
int status = super.kEventMouseDown (nextHandler, theEvent, userData);
if (status == OS.noErr) return status;
dragging = false;
status = OS.CallNextEventHandler (nextHandler, theEvent);
if (dragging) {
Event event = new Event ();
sendSelectionEvent (SWT.Selection, event, true);
}
dragging = false;
return status;
}
int kEventMouseWheelMoved (int nextHandler, int theEvent, int userData) {
return parent.kEventMouseWheelMoved (nextHandler, theEvent, userData);
}
void redraw () {
redrawWidget (handle, false);
}
/**
* 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 register () {
super.register ();
display.addWidget (handle, this);
}
void releaseHandle () {
super.releaseHandle ();
handle = 0;
}
void releaseParent () {
super.releaseParent ();
if (parent.horizontalBar == this) parent.horizontalBar = null;
if (parent.verticalBar == this) parent.verticalBar = null;
parent.resizeClientArea ();
}
void releaseWidget () {
super.releaseWidget ();
if (visibleRgn != 0) OS.DisposeRgn (visibleRgn);
visibleRgn = 0;
}
void resetVisibleRegion (int control) {
if (visibleRgn != 0) {
OS.DisposeRgn (visibleRgn);
visibleRgn = 0;
}
}
/**
* 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;
}
/**
* 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;
OS.EnableControl (handle);
} else {
if ((state & DISABLED) != 0) return;
state |= DISABLED;
OS.DisableControl (handle);
}
}
/**
* 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 minimum = OS.GetControl32BitMinimum (handle);
if (value <= minimum) return;
int viewSize = OS.GetControlViewSize (handle);
if (value - minimum < viewSize) {
viewSize = value - minimum;
OS.SetControlViewSize (handle, viewSize);
}
OS.SetControl32BitMaximum (handle, value - viewSize);
}
/**
* 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 viewSize = OS.GetControlViewSize (handle);
int maximum = OS.GetControl32BitMaximum (handle) + viewSize;
if (value >= maximum) return;
if (maximum - value < viewSize) {
viewSize = maximum - value;
OS.SetControl32BitMaximum (handle, maximum - viewSize);
OS.SetControlViewSize (handle, viewSize);
}
OS.SetControl32BitMinimum (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 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 value) {
checkWidget();
OS.SetControl32BitValue (handle, value);
}
/**
* 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 minimum = OS.GetControl32BitMinimum (handle);
int viewSize = OS.GetControlViewSize (handle);
int maximum = OS.GetControl32BitMaximum (handle) + viewSize;
value = Math.min (value, maximum - minimum);
OS.SetControl32BitMaximum (handle, maximum - value);
OS.SetControlViewSize (handle, 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;
thumb = Math.min (thumb, maximum - minimum);
OS.SetControl32BitMinimum (handle, minimum);
OS.SetControl32BitMaximum (handle, maximum - thumb);
OS.SetControlViewSize (handle, thumb);
OS.SetControl32BitValue (handle, selection);
this.increment = increment;
this.pageIncrement = pageIncrement;
}
/**
* 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 (visible) {
if ((state & HIDDEN) == 0) return;
state &= ~HIDDEN;
} else {
if ((state & HIDDEN) != 0) return;
state |= HIDDEN;
}
if (parent.setScrollBarVisible (this, visible)) {
sendEvent (visible ? SWT.Show : SWT.Hide);
parent.sendEvent (SWT.Resize);
}
}
void setZOrder () {
OS.HIViewAddSubview (parent.scrolledHandle, handle);
}
}