| package org.eclipse.swt.widgets; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved |
| */ |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.internal.*; |
| 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 slider will have a |
| * single <em>selection</em> that is considered to be its |
| * value, which is constrained to be within the range of |
| * values the slider represents (that is, between its |
| * <em>minimum</em> and <em>maximum</em> values). |
| * </p><p> |
| * Typically, sliders 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, sliders 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 slider'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 slider will not change. |
| * </p> |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>HORIZONTAL, VERTICAL</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>Selection</dd> |
| * </dl> |
| * <p> |
| * IMPORTANT: This class is <em>not</em> intended to be subclassed. |
| * |
| * @see ScrollBar |
| */ |
| |
| public class Slider extends Control { |
| |
| /** |
| * Constructs a new instance of this class given its parent |
| * and a style value describing its behavior and appearance. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</code> which is applicable to instances of this |
| * class, or must be built by <em>bitwise OR</em>'ing together |
| * (that is, using the <code>int</code> "|" operator) two or more |
| * of those <code>SWT</code> style constants. The class description |
| * for all SWT widget classes should include a comment which |
| * describes the style constants which are applicable to the class. |
| * </p> |
| * |
| * @param parent a composite control which will be the parent of the new instance (cannot be null) |
| * @param style the style of control to construct |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see SWT |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Slider (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| } |
| |
| /** |
| * Adds the listener to the collection of listeners who will |
| * be notified when the receiver's value changes, 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>0</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 |
| * |
| * @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) { |
| state |= HANDLE; |
| int hAdjustment = OS.gtk_adjustment_new (0, 0, 100, 1, 10, 10); |
| if (hAdjustment == 0) error (SWT.ERROR_NO_HANDLES); |
| if ((style & SWT.HORIZONTAL) != 0) { |
| handle = OS.gtk_hscrollbar_new (hAdjustment); |
| } else { |
| handle = OS.gtk_vscrollbar_new (hAdjustment); |
| } |
| if (handle == 0) error (SWT.ERROR_NO_HANDLES); |
| } |
| |
| void setHandleStyle() {} |
| |
| void showHandle() { |
| OS.gtk_widget_show (handle); |
| OS.gtk_widget_realize (handle); |
| } |
| |
| void hookEvents () { |
| super.hookEvents (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| signal_connect (hAdjustment, "value_changed", SWT.Selection, 2); |
| } |
| |
| void register () { |
| super.register (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| WidgetTable.put (hAdjustment, this); |
| } |
| |
| void deregister () { |
| super.deregister (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| WidgetTable.remove (hAdjustment); |
| /* |
| * This code is intentionally commented. |
| */ |
| // OS.gtk_object_unref (hAdjustment); |
| // OS.gtk_object_destroy (hAdjustment); |
| } |
| |
| public Point computeSize (int wHint, int hHint, boolean changed) { |
| checkWidget (); |
| // We are interested in the preferred size. |
| // The native widget gives us what it thinks the minimum reasonable |
| // size; we'll say we prefer to be twice that long, and exactly |
| // that wide. |
| int x,y; |
| Point size = super.computeSize (wHint, hHint, changed); |
| if (hHint==SWT.DEFAULT) { |
| x = size.x; |
| if ((style & SWT.HORIZONTAL) != 0) x = 2*x; |
| } else x = hHint; |
| if (wHint==SWT.DEFAULT) { |
| y = size.y; |
| if ((style & SWT.VERTICAL) != 0) y = 2*y; |
| } else y = wHint; |
| |
| return new Point(x,y); |
| } |
| |
| /** |
| * 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 hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| 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 (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| 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 (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| 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 (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| return (int) adjustment.page_increment; |
| } |
| |
| /** |
| * Returns the single <em>selection</em> 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 hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| return (int) adjustment.value; |
| } |
| |
| /** |
| * 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> |
| */ |
| public int getThumb () { |
| checkWidget (); |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| return (int) adjustment.page_size; |
| } |
| |
| int processSelection (int int0, int int1, int int2) { |
| postEvent (SWT.Selection); |
| return 0; |
| } |
| |
| /** |
| * Removes the listener from the collection of listeners who will |
| * be notified when the receiver's value changes. |
| * |
| * @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); |
| } |
| |
| /** |
| * 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 hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| adjustment.step_increment = (float) value; |
| OS.memmove (hAdjustment, adjustment, GtkAdjustment.sizeof); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_changed (hAdjustment); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| /** |
| * Sets the maximum value which the receiver will allow |
| * to be the argument which must be greater than or |
| * equal to zero. |
| * |
| * @param value the new maximum (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 setMaximum (int value) { |
| checkWidget (); |
| if (value < 0) return; |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| adjustment.upper = (float) value; |
| OS.memmove (hAdjustment, adjustment, GtkAdjustment.sizeof); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_changed (hAdjustment); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| /** |
| * Sets the minimum value which the receiver will allow |
| * to be the argument which must be greater than or |
| * equal to zero. |
| * |
| * @param value the new minimum (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 setMinimum (int value) { |
| checkWidget (); |
| if (value < 0) return; |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| adjustment.lower = (float) value; |
| OS.memmove (hAdjustment, adjustment, GtkAdjustment.sizeof); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_changed (hAdjustment); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| /** |
| * 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. |
| * |
| * @return 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 hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| adjustment.page_increment = (float) value; |
| OS.memmove (hAdjustment, adjustment, GtkAdjustment.sizeof); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_changed (hAdjustment); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| /** |
| * 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 value 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 (); |
| if (value < 0) return; |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_set_value (hAdjustment, value); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| /** |
| * Sets the size of the receiver's thumb relative to the |
| * difference between its maximum and minimum values to the |
| * argument which must be at least one. |
| * |
| * @param value the new thumb value (must be at least one) |
| * |
| * @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 void setThumb (int value) { |
| checkWidget (); |
| if (value < 1) return; |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| adjustment.page_size = (float) value; |
| OS.memmove (hAdjustment, adjustment, GtkAdjustment.sizeof); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_changed (hAdjustment); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| /** |
| * Sets the receiver's selection, minimum value, maximum |
| * value, thumb, increment and page increment all at once. |
| * <p> |
| * Note: This is equivalent 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 (selection < 0) return; |
| if (minimum < 0) return; |
| if (maximum < 0) return; |
| if (thumb < 1) return; |
| if (maximum - minimum - thumb < 0) return; |
| if (increment < 1) return; |
| if (pageIncrement < 1) return; |
| int hAdjustment = OS.gtk_range_get_adjustment (handle); |
| GtkAdjustment adjustment = new GtkAdjustment (); |
| OS.memmove (adjustment, hAdjustment, GtkAdjustment.sizeof); |
| adjustment.value = (float) selection; |
| adjustment.lower = (float) minimum; |
| adjustment.upper = (float) maximum; |
| adjustment.page_size = (float) thumb; |
| adjustment.step_increment = (float) increment; |
| adjustment.page_increment = (float) pageIncrement; |
| OS.memmove (hAdjustment, adjustment, GtkAdjustment.sizeof); |
| OS.gtk_signal_handler_block_by_data (hAdjustment, SWT.Selection); |
| OS.gtk_adjustment_changed (hAdjustment); |
| OS.gtk_adjustment_value_changed (hAdjustment); |
| OS.gtk_signal_handler_unblock_by_data (hAdjustment, SWT.Selection); |
| } |
| |
| } |