/*******************************************************************************
* 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.*;
import org.eclipse.swt.internal.gtk.*;
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;
int /*long*/ adjustmentHandle;
int detail;
boolean dragSent;
ScrollBar () {
}
/**
* Creates a new instance of the widget.
*/
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 deregister () {
super.deregister ();
if (adjustmentHandle != 0) display.removeWidget (adjustmentHandle);
}
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 ();
if (handle != 0) return OS.GTK_WIDGET_SENSITIVE (handle);
return true;
}
/**
* 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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
return (int) adjustment.step_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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
return (int) adjustment.upper;
}
/**
* 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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
return (int) adjustment.lower;
}
/**
* 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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
return (int) adjustment.page_increment;
}
/**
* 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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
return (int) adjustment.value;
}
/**
* 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 ();
if (handle == 0) return new Point (0,0);
GtkRequisition requisition = new GtkRequisition ();
OS.gtk_widget_size_request (handle, requisition);
return new Point (requisition.width, requisition.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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
return (int) adjustment.page_size;
}
/**
* 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 slider_start = OS.GTK_RANGE_SLIDER_START (handle);
int slider_end = OS.GTK_RANGE_SLIDER_END (handle);
int x, y, width, height;
if ((style & SWT.VERTICAL) != 0) {
x = OS.GTK_WIDGET_X (handle);
y = slider_start;
width = OS.GTK_WIDGET_WIDTH (handle);
height = slider_end - slider_start;
} else {
x = slider_start;
y = OS.GTK_WIDGET_Y (handle);
width = slider_end - slider_start;
height = OS.GTK_WIDGET_HEIGHT (handle);
}
Rectangle rect = new Rectangle(x, y, width, height);
int [] origin_x = new int [1], origin_y = new int [1];
int /*long*/ window = OS.GTK_WIDGET_WINDOW (parent.scrolledHandle);
if (window != 0) OS.gdk_window_get_origin (window, origin_x, origin_y);
rect.x += origin_x [0];
rect.y += origin_y [0];
window = OS.GTK_WIDGET_WINDOW (parent.handle);
if (window != 0) OS.gdk_window_get_origin (window, origin_x, origin_y);
rect.x -= origin_x [0];
rect.y -= origin_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 x = 0, y = 0, width, height;
boolean hasA = OS.GTK_RANGE_HAS_STEPPER_A (handle);
boolean hasB = OS.GTK_RANGE_HAS_STEPPER_B (handle);
boolean hasC = OS.GTK_RANGE_HAS_STEPPER_C (handle);
boolean hasD = OS.GTK_RANGE_HAS_STEPPER_D (handle);
if ((style & SWT.VERTICAL) != 0) {
int stepperSize = OS.GTK_WIDGET_WIDTH (handle);
x = OS.GTK_WIDGET_X (handle);
if (hasA) y += stepperSize;
if (hasB) y += stepperSize;
width = OS.GTK_WIDGET_WIDTH (handle);
height = OS.GTK_WIDGET_HEIGHT (handle) - y;
if (hasC) height -= stepperSize;
if (hasD) height -= stepperSize;
if (height < 0) {
y = OS.GTK_RANGE_SLIDER_START (handle);
height = 0;
}
} else {
int stepperSize = OS.GTK_WIDGET_HEIGHT (handle);
if (hasA) x += stepperSize;
if (hasB) x += stepperSize;
y = OS.GTK_WIDGET_Y (handle);
width = OS.GTK_WIDGET_WIDTH (handle) - x;
if (hasC) width -= stepperSize;
if (hasD) width -= stepperSize;
height = OS.GTK_WIDGET_HEIGHT (handle);
if (width < 0) {
x = OS.GTK_RANGE_SLIDER_START (handle);
width = 0;
}
}
Rectangle rect = new Rectangle(x, y, width, height);
int [] origin_x = new int [1], origin_y = new int [1];
int /*long*/ window = OS.GTK_WIDGET_WINDOW (parent.scrolledHandle);
if (window != 0) OS.gdk_window_get_origin (window, origin_x, origin_y);
rect.x += origin_x [0];
rect.y += origin_y [0];
window = OS.GTK_WIDGET_WINDOW (parent.handle);
if (window != 0) OS.gdk_window_get_origin (window, origin_x, origin_y);
rect.x -= origin_x [0];
rect.y -= origin_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 ();
int /*long*/ scrolledHandle = parent.scrolledHandle;
int [] hsp = new int [1], vsp = new int [1];
OS.gtk_scrolled_window_get_policy (scrolledHandle, hsp, vsp);
if ((style & SWT.HORIZONTAL) != 0) {
return hsp [0] != OS.GTK_POLICY_NEVER;
} else {
return vsp [0] != OS.GTK_POLICY_NEVER;
}
}
int /*long*/ gtk_button_press_event (int /*long*/ widget, int /*long*/ eventPtr) {
int /*long*/ result = super.gtk_button_press_event (widget, eventPtr);
if (result != 0) return result;
detail = OS.GTK_SCROLL_NONE;
dragSent = false;
return result;
}
int /*long*/ gtk_change_value (int /*long*/ widget, int /*long*/ scroll, int /*long*/ value1, int /*long*/ value2) {
detail = (int)/*64*/scroll;
return 0;
}
int /*long*/ gtk_value_changed (int /*long*/ adjustment) {
Event event = new Event ();
dragSent = detail == OS.GTK_SCROLL_JUMP;
switch (detail) {
case OS.GTK_SCROLL_NONE: event.detail = SWT.NONE; break;
case OS.GTK_SCROLL_JUMP: event.detail = SWT.DRAG; break;
case OS.GTK_SCROLL_START: event.detail = SWT.HOME; break;
case OS.GTK_SCROLL_END: event.detail = SWT.END; break;
case OS.GTK_SCROLL_PAGE_DOWN:
case OS.GTK_SCROLL_PAGE_RIGHT:
case OS.GTK_SCROLL_PAGE_FORWARD: event.detail = SWT.PAGE_DOWN; break;
case OS.GTK_SCROLL_PAGE_UP:
case OS.GTK_SCROLL_PAGE_LEFT:
case OS.GTK_SCROLL_PAGE_BACKWARD: event.detail = SWT.PAGE_UP; break;
case OS.GTK_SCROLL_STEP_DOWN:
case OS.GTK_SCROLL_STEP_RIGHT:
case OS.GTK_SCROLL_STEP_FORWARD: event.detail = SWT.ARROW_DOWN; break;
case OS.GTK_SCROLL_STEP_UP:
case OS.GTK_SCROLL_STEP_LEFT:
case OS.GTK_SCROLL_STEP_BACKWARD: event.detail = SWT.ARROW_UP; break;
}
if (!dragSent) detail = OS.GTK_SCROLL_NONE;
sendSelectionEvent (SWT.Selection, event, false);
parent.updateScrollBarValue (this);
return 0;
}
int /*long*/ gtk_event_after (int /*long*/ widget, int /*long*/ gdkEvent) {
GdkEvent gtkEvent = new GdkEvent ();
OS.memmove (gtkEvent, gdkEvent, GdkEvent.sizeof);
switch (gtkEvent.type) {
case OS.GDK_BUTTON_RELEASE: {
GdkEventButton gdkEventButton = new GdkEventButton ();
OS.memmove (gdkEventButton, gdkEvent, GdkEventButton.sizeof);
if (gdkEventButton.button == 1 && detail == OS.GTK_SCROLL_JUMP) {
if (!dragSent) {
Event event = new Event ();
event.detail = SWT.DRAG;
sendSelectionEvent (SWT.Selection, event, false);
}
sendSelectionEvent (SWT.Selection);
}
detail = OS.GTK_SCROLL_NONE;
dragSent = false;
break;
}
}
return super.gtk_event_after (widget, gdkEvent);
}
void hookEvents () {
super.hookEvents ();
if (OS.GTK_VERSION >= OS.VERSION (2, 6, 0)) {
OS.g_signal_connect_closure (handle, OS.change_value, display.closures [CHANGE_VALUE], false);
}
OS.g_signal_connect_closure (adjustmentHandle, OS.value_changed, display.closures [VALUE_CHANGED], false);
OS.g_signal_connect_closure_by_id (handle, display.signalIds [EVENT_AFTER], 0, display.closures [EVENT_AFTER], false);
OS.g_signal_connect_closure_by_id (handle, display.signalIds [BUTTON_PRESS_EVENT], 0, display.closures [BUTTON_PRESS_EVENT], false);
}
/**
* 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 () && getParent ().getEnabled ();
}
/**
* 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 () && getParent ().isVisible ();
}
void register () {
super.register ();
if (adjustmentHandle != 0) display.addWidget (adjustmentHandle, this);
}
void releaseHandle () {
super.releaseHandle ();
parent = null;
}
void releaseParent () {
super.releaseParent ();
if (parent.horizontalBar == this) parent.horizontalBar = null;
if (parent.verticalBar == this) parent.verticalBar = null;
}
void releaseWidget () {
super.releaseWidget ();
//parent = 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);
}
/**
* 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 (handle != 0) OS.gtk_widget_set_sensitive (handle, enabled);
}
/**
* 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;
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
adjustment.step_increment = (float) value;
OS.memmove (adjustmentHandle, adjustment);
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_changed (adjustmentHandle);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
/**
* 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 ();
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
int minimum = (int) adjustment.lower;
if (value <= minimum) return;
adjustment.upper = value;
adjustment.page_size = Math.min ((int)adjustment.page_size, value - minimum);
adjustment.value = Math.min ((int)adjustment.value, (int)(value - adjustment.page_size));
OS.memmove (adjustmentHandle, adjustment);
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_changed (adjustmentHandle);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
/**
* 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;
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
int maximum = (int) adjustment.upper;
if (value >= maximum) return;
adjustment.lower = value;
adjustment.page_size = Math.min ((int)adjustment.page_size, maximum - value);
adjustment.value = Math.max ((int)adjustment.value, value);
OS.memmove (adjustmentHandle, adjustment);
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_changed (adjustmentHandle);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
void setOrientation () {
super.setOrientation ();
if ((parent.style & SWT.MIRRORED) != 0) {
if ((parent.state & CANVAS) != 0) {
if ((style & SWT.HORIZONTAL) != 0) {
OS.gtk_range_set_inverted (handle, true);
}
}
}
}
/**
* 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;
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
adjustment.page_increment = (float) value;
OS.memmove (adjustmentHandle, adjustment);
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_changed (adjustmentHandle);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
/**
* 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 ();
value = Math.min (value, getMaximum() - getThumb());
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_set_value (adjustmentHandle, value);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
/**
* 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;
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
value = (int) Math.min (value, (int)(adjustment.upper - adjustment.lower));
adjustment.page_size = (double) value;
adjustment.value = Math.min ((int)adjustment.value, (int)(adjustment.upper - value));
OS.memmove (adjustmentHandle, adjustment);
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_changed (adjustmentHandle);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
/**
* 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);
GtkAdjustment adjustment = new GtkAdjustment ();
OS.memmove (adjustment, adjustmentHandle);
adjustment.lower = minimum;
adjustment.upper = maximum;
adjustment.step_increment = increment;
adjustment.page_increment = pageIncrement;
adjustment.page_size = thumb;
adjustment.value = Math.min (Math.max (selection, minimum), maximum - thumb);
OS.memmove (adjustmentHandle, adjustment);
OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
OS.gtk_adjustment_changed (adjustmentHandle);
OS.gtk_adjustment_value_changed (adjustmentHandle);
OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
}
/**
* 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);
}
}
}
