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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/ScrollBar.java')
| -rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/ScrollBar.java | 768 |
1 files changed, 768 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/ScrollBar.java b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/ScrollBar.java new file mode 100644 index 0000000000..b2fcd24553 --- /dev/null +++ b/bundles/org.eclipse.swt/Eclipse SWT/gtk/org/eclipse/swt/widgets/ScrollBar.java @@ -0,0 +1,768 @@ +/******************************************************************************* + * 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 size of the receiver's thumb relative to the + * difference between its maximum and minimum values. + * + * @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 <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; + } + detail = OS.GTK_SCROLL_NONE; + if (!dragSent) detail = OS.GTK_SCROLL_NONE; + postEvent (SWT.Selection, event); + 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 == SWT.DRAG) { + if (!dragSent) { + Event event = new Event (); + event.detail = SWT.DRAG; + postEvent (SWT.Selection, event); + } + postEvent (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 size of the receiver's thumb relative to the + * difference between its maximum and minimum values. This new + * value will be ignored if it is less than one, and will be + * clamped if it exceeds the receiver's current range. + * + * @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); + } +} + +} |