--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/javauis/eswt_qt/org.eclipse.swt/Eclipse SWT/qt/org/eclipse/swt/widgets/Slider.java Mon May 03 12:27:20 2010 +0300
@@ -0,0 +1,604 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 IBM Corporation and others.
+ * Portion Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
+ * 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
+ * Nokia Corporation - Qt implementation
+ *******************************************************************************/
+package org.eclipse.swt.widgets;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.internal.qt.OS;
+import org.eclipse.swt.internal.qt.WidgetState;
+import org.eclipse.swt.events.SelectionListener;
+
+/**
+ * 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 'selection' 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>
+ * 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 ScrollBar
+ */
+public class Slider extends Control {
+
+ /**
+ * This is used for storing the latest value that user has set the Slider
+ * using setSelection(). If user changes the value of the Slider with
+ * keys/mouse we get valueChanged() signal in which we send a
+ * SelectionEvent. However, we get the same signal also after user sets the
+ * selection using setSelection(). In that case we must not send a selection
+ * event.
+ */
+ int value = -1;
+
+ /**
+ * QSlider does not have thumb support, so we emulate the API behavior in
+ * Java side.
+ */
+ int thumb = 1;
+
+ /**
+ * This is used to store the information about key/mouse action that may
+ * cause Slider value to change.
+ */
+ int selectionCause = 0;
+
+ /**
+ * This is set to true when a DRAG event occurs, so that we can send a drag
+ * end event when user releases the mouse.
+ */
+ boolean dragOccurred = false;
+
+ /**
+ * 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 lists the style constants that are
+ * applicable to the class. Style bits are also inherited from superclasses.
+ * </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#HORIZONTAL
+ * @see SWT#VERTICAL
+ * @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 user changes the receiver's value, by sending it one of the
+ * messages defined in the <code>SelectionListener</code> interface.
+ * <p>
+ * When <code>widgetSelected</code> is called, the event object detail field
+ * contains one of the following values: <code>SWT.NONE</code> - for the end
+ * of a drag. <code>SWT.DRAG</code>. <code>SWT.HOME</code>.
+ * <code>SWT.END</code>. <code>SWT.ARROW_DOWN</code>.
+ * <code>SWT.ARROW_UP</code>. <code>SWT.PAGE_DOWN</code>.
+ * <code>SWT.PAGE_UP</code>. <code>widgetDefaultSelected</code> is not
+ * called.
+ * </p>
+ *
+ * @param listener the listener which should be notified when the user changes
+ * the receiver's value
+ *
+ * @exception IllegalArgumentException <ul>
+ * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
+ * </ul>
+ * @exception SWTException <ul>
+ * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see SelectionListener
+ * @see #removeSelectionListener
+ * @see SelectionEvent
+ */
+ public void addSelectionListener(SelectionListener listener) {
+ checkWidget();
+ if (listener == null) error(SWT.ERROR_NULL_ARGUMENT);
+ TypedListener typedListener = new TypedListener(listener);
+ addListener(SWT.Selection, typedListener);
+ addListener(SWT.DefaultSelection, typedListener);
+ }
+
+ static int checkStyle(int style) {
+ return checkBits(style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
+ }
+
+ void createHandle_pp(int index) {
+ state |= WidgetState.HANDLE;
+ topHandle = handle = OS.QSlider_new();
+
+ if ((style & SWT.VERTICAL) != 0) {
+ OS.QSlider_setOrientation(handle, OS.QT_VERTICAL);
+ } else {
+ OS.QSlider_setOrientation(handle, OS.QT_HORIZONTAL);
+ }
+ }
+
+ void hookEvents_pp() {
+ int signalProxy = OS.SignalHandler_new(handle, display,
+ OS.QSIGNAL_SLIDER_CHANGED);
+ OS.QObject_connectOrThrow(handle, "valueChanged(int)", signalProxy,
+ "widgetSignal(int)", OS.QT_AUTOCONNECTION);
+ }
+
+ /**
+ * 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 OS.QSlider_singleStep(handle);
+ }
+
+ /**
+ * 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();
+ return OS.QSlider_maximum(handle);
+ }
+
+ /**
+ * 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.QSlider_minimum(handle);
+ }
+
+ /**
+ * 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 OS.QSlider_pageStep(handle);
+ }
+
+ /**
+ * Returns the 'selection', which 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.QSlider_value(handle);
+ }
+
+ /**
+ * 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();
+ return thumb;
+ }
+
+ /**
+ * 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);
+ }
+
+ /**
+ * 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;
+ }
+ OS.QSlider_setSingleStep(handle, value);
+ }
+
+ /**
+ * 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, which must be greater than the current
+ * 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 setMaximum(int value) {
+ checkWidget();
+ int minimum = OS.QSlider_minimum(handle);
+
+ if (value >= 0 && value > minimum) {
+ thumb = Math.min(thumb, value - minimum);
+ setValue(Math.min(OS.QSlider_value(handle), value - thumb));
+ OS.QSlider_setMaximum(handle, value);
+ }
+ }
+
+ /**
+ * 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 maximum = OS.QSlider_maximum(handle);
+ if (value >= maximum) {
+ return;
+ }
+ this.thumb = Math.min(thumb, maximum - value);
+ setValue(Math.max(OS.QSlider_value(handle), value));
+ OS.QSlider_setMinimum(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;
+ }
+ OS.QSlider_setPageStep(handle, value);
+ }
+
+ /**
+ * Sets the 'selection', which 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();
+ // Adjust the selection to range [minimum, maximum-thumb]
+ setValue(Math.max(Math.min(value, OS.QSlider_maximum(handle) - thumb),
+ OS.QSlider_minimum(handle)));
+ }
+
+ /**
+ * 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;
+ }
+
+ int selection = OS.QSlider_value(handle);
+ int maximum = OS.QSlider_maximum(handle);
+ value = Math.min(value, maximum - OS.QSlider_minimum(handle));
+
+ this.thumb = value;
+ setValue(Math.min(selection, maximum - 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);
+ this.thumb = thumb;
+ OS.QSlider_setMaximum(handle, maximum);
+ OS.QSlider_setMinimum(handle, minimum);
+ OS.QSlider_setSingleStep(handle, increment);
+ OS.QSlider_setPageStep(handle, pageIncrement);
+ setValue(Math.min(Math.max(selection, minimum), maximum - thumb));
+ }
+
+ void setValue(int value) {
+ this.value = value;
+ OS.QSlider_setValue(handle, value);
+ }
+
+ boolean qt_event_mouseButtonRelease_pp(int widgetHandle, int button,
+ int x, int y, int state, int buttons) {
+ this.selectionCause = SWT.NONE;
+
+ /**
+ * If user was dragging (i.e. we have sent drag events), send a drag end
+ * when mouse button is released
+ */
+ if (this.dragOccurred) {
+ this.dragOccurred = false;
+ sendSliderSelectionEvent(this.selectionCause);
+ }
+
+ return super.qt_event_mouseButtonRelease_pp(widgetHandle, button, x,
+ y, state, buttons);
+ }
+
+ boolean qt_event_mouseMove(int widgetHandle, int button, int x,
+ int y, int state, int buttons) {
+ this.selectionCause = SWT.DRAG;
+ return super
+ .qt_event_mouseMove(widgetHandle, button, x, y, state, buttons);
+ }
+
+ boolean qt_event_keypress_pp(int widgetHandle, int key, int modifier, int character, int nativeScanCode) {
+
+ /**
+ * The following keys can cause Slider selection to change, save the key
+ * code here so that we can use it later when creating the selection
+ * event.
+ */
+ switch (key) {
+ case OS.QT_KEY_LEFT:
+ case OS.QT_KEY_RIGHT:
+ case OS.QT_KEY_UP:
+ case OS.QT_KEY_DOWN:
+ case OS.QT_KEY_HOME:
+ case OS.QT_KEY_END:
+ case OS.QT_KEY_PAGEUP:
+ case OS.QT_KEY_PAGEDOWN:
+ this.selectionCause = Display.translateKey(key, false);
+ break;
+ default:
+ this.selectionCause = SWT.NONE;
+ break;
+ }
+
+ return super.qt_event_keypress_pp(widgetHandle, key, modifier, character, nativeScanCode);
+ }
+
+ void setTraversalFlags_pp(int type, int key, int modifier,
+ int character) {
+ traverseDoit = true;
+ traverseCancel = true;
+
+ /**
+ * The following keys cause the slider value to change, so those keys
+ * cannot be used for traversing by default: - Left/right moves a
+ * horizontal slider by one step - Up/down moves a vertical slider by
+ * one step - Page up/down moves by one page - Home/end moves to
+ * beginning/end of the slider
+ */
+ switch (key) {
+ case OS.QT_KEY_LEFT:
+ case OS.QT_KEY_RIGHT:
+ if ((style & SWT.HORIZONTAL) != 0) {
+ traverseDoit = false;
+ }
+ traverseCancel = false;
+ break;
+ case OS.QT_KEY_UP:
+ case OS.QT_KEY_DOWN:
+ if ((style & SWT.VERTICAL) != 0) {
+ traverseDoit = false;
+ }
+ traverseCancel = false;
+ break;
+ case OS.QT_KEY_PAGEUP:
+ case OS.QT_KEY_PAGEDOWN:
+ case OS.QT_KEY_HOME:
+ case OS.QT_KEY_END:
+ traverseDoit = false;
+ traverseCancel = false;
+ break;
+ default:
+ break;
+ }
+
+ }
+
+ void qt_signal_slider_changed(int value) {
+ /**
+ * If Slider value has changed without the user calling some Slider API
+ * function that causes the value to change, conclude that user
+ * interaction has caused the slider value to change and send a
+ * selection event.
+ */
+ if (this.value != value) {
+ this.value = value;
+
+ if (this.selectionCause == SWT.DRAG) {
+ this.dragOccurred = true;
+ }
+
+ sendSliderSelectionEvent(this.selectionCause);
+ }
+ }
+
+ void sendSliderSelectionEvent(int detail) {
+ Event event = new Event();
+ event.widget = this;
+ event.detail = detail;
+
+ sendEvent(SWT.Selection, event, true);
+ }
+
+}