Java tutorial
/******************************************************************************* * Copyright (c) 2002, 2015 Innoopract Informationssysteme GmbH 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: * Innoopract Informationssysteme GmbH - initial API and implementation * EclipseSource - ongoing development ******************************************************************************/ package org.eclipse.swt.widgets; import org.eclipse.rap.rwt.internal.lifecycle.WidgetLCA; import org.eclipse.rap.rwt.internal.textsize.TextSizeUtil; import org.eclipse.rap.rwt.internal.theme.ThemeAdapter; import org.eclipse.rap.rwt.theme.BoxDimensions; import org.eclipse.swt.SWT; import org.eclipse.swt.SWTException; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.events.VerifyListener; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.internal.graphics.FontUtil; import org.eclipse.swt.internal.widgets.ITextAdapter; import org.eclipse.swt.internal.widgets.ListModel; import org.eclipse.swt.internal.widgets.combokit.ComboLCA; import org.eclipse.swt.internal.widgets.combokit.ComboThemeAdapter; /** * Instances of this class are controls that allow the user * to choose an item from a list of items, or optionally * enter a new value by typing it into an editable text * field. Often, <code>Combo</code>s are used in the same place * where a single selection <code>List</code> widget could * be used but space is limited. A <code>Combo</code> takes * less space than a <code>List</code> widget and shows * similar information. * <p> * Note: Since <code>Combo</code>s can contain both a list * and an editable text field, it is possible to confuse methods * which access one versus the other (compare for example, * <code>clearSelection()</code> and <code>deselectAll()</code>). * The API documentation is careful to indicate either "the * receiver's list" or the "the receiver's text field" to * distinguish between the two cases. * </p><p> * Note that although this class is a subclass of <code>Composite</code>, * it does not make sense to add children to it, or set a layout on it. * </p> * <dl> * <dt><b>Styles:</b></dt> * <dd>DROP_DOWN, READ_ONLY<!--, SIMPLE --></dd> * <dt><b>Events:</b></dt> * <dd>DefaultSelection, Modify, Selection</dd> * </dl> * <p> * <!-- Note: Only one of the styles DROP_DOWN and SIMPLE may be specified. --> * </p><p> * IMPORTANT: This class is <em>not</em> intended to be subclassed. * </p> * * @see List * @since 1.0 */ public class Combo extends Composite { /** * The maximum number of characters that can be entered * into a text widget. * @since 1.3 */ public static final int LIMIT = Integer.MAX_VALUE; // Must be in sync with appearance "list-item" private static final int LIST_ITEM_PADDING = 3; private static final double LINE_HEIGHT_FACTOR = 1.4; private ITextAdapter textAdapter; private final ListModel model; private String text; private int textLimit; private int visibleCount; private final Point selection; private boolean dropped; /** * 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#DROP_DOWN * @see SWT#READ_ONLY * @see SWT#SIMPLE * @see Widget#checkSubclass * @see Widget#getStyle */ public Combo(Composite parent, int style) { super(parent, checkStyle(style)); text = ""; visibleCount = 5; dropped = false; textLimit = LIMIT; selection = new Point(0, 0); model = new ListModel(true); } @Override void initState() { removeState( /* CANVAS | */THEME_BACKGROUND); } /** * Returns the zero-relative index of the item which is currently * selected in the receiver's list, or -1 if no item is selected. * * @return the index of the selected item * * @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 getSelectionIndex() { checkWidget(); return model.getSelectionIndex(); } /** * Selects the item at the given zero-relative index in the receiver's * list. If the item at the index was already selected, it remains * selected. Indices that are out of range are ignored. * * @param selectionIndex the index of the item to select * * @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 select(int selectionIndex) { checkWidget(); if (0 <= selectionIndex && selectionIndex < getItemCount()) { model.setSelection(selectionIndex); updateText(); } } /** * Deselects the item at the given zero-relative index in the receiver's * list. If the item at the index was already deselected, it remains * deselected. Indices that are out of range are ignored. * * @param index the index of the item to deselect * * @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 deselect(int index) { checkWidget(); if (index == model.getSelectionIndex()) { model.setSelection(-1); } updateText(); } /** * Deselects all selected items in the receiver's list. * <p> * Note: To clear the selection in the receiver's text field, * use <code>clearSelection()</code>. * </p> * * @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 #clearSelection */ public void deselectAll() { checkWidget(); model.deselectAll(); text = ""; notifyListeners(SWT.Modify, new Event()); } /** * Sets the selection in the receiver's text field to the * range specified by the argument whose x coordinate is the * start of the selection and whose y coordinate is the end * of the selection. * * @param selection a point representing the new selection start and end * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the point 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> * * @since 1.3 */ public void setSelection(Point selection) { checkWidget(); if (selection == null) { SWT.error(SWT.ERROR_NULL_ARGUMENT); } int validatedStart = this.selection.x; int validatedEnd = this.selection.y; int start = selection.x; int end = selection.y; if (start >= 0 && end >= start) { validatedStart = Math.min(start, text.length()); validatedEnd = Math.min(end, text.length()); } else if (end >= 0 && start > end) { validatedStart = Math.min(end, text.length()); validatedEnd = Math.min(start, text.length()); } this.selection.x = validatedStart; this.selection.y = validatedEnd; } /** * Returns a <code>Point</code> whose x coordinate is the * character position representing the start of the selection * in the receiver's text field, and whose y coordinate is the * character position representing the end of the selection. * An "empty" selection is indicated by the x and y coordinates * having the same value. * <p> * Indexing is zero based. The range of a selection is from * 0..N where N is the number of characters in the widget. * </p> * * @return a point representing the selection start and end * * @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 1.3 */ public Point getSelection() { checkWidget(); return new Point(selection.x, selection.y); } /** * Sets the selection in the receiver's text field to an empty * selection starting just before the first character. If the * text field is editable, this has the effect of placing the * i-beam at the start of the text. * <p> * Note: To clear the selected items in the receiver's list, * use <code>deselectAll()</code>. * </p> * * @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 #deselectAll * * @since 1.3 */ public void clearSelection() { checkWidget(); resetSelection(); } /** * Adds the argument to the end of the receiver's list. * * @param string the new item * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the string 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 #add(String,int) */ public void add(String string) { checkWidget(); model.add(string); } /** * Adds the argument to the receiver's list at the given * zero-relative index. * <p> * Note: To add an item at the end of the list, use the * result of calling <code>getItemCount()</code> as the * index or use <code>add(String)</code>. * </p> * * @param string the new item * @param index the index for the item * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the string is null</li> * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (inclusive)</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 #add(String) */ public void add(String string, int index) { checkWidget(); model.add(string, index); } /** * Removes the item from the receiver's list at the given * zero-relative index. * * @param index the index for the item * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</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> */ public void remove(int index) { checkWidget(); int selectionIndex = getSelectionIndex(); if (selectionIndex == index) { deselect(index); } model.remove(index); } /** * Removes the items from the receiver's list which are * between the given zero-relative start and end * indices (inclusive). * * @param start the start of the range * @param end the end of the range * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_RANGE - if either the start or end are not between 0 and the number of elements in the list minus 1 (inclusive)</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> */ public void remove(int start, int end) { checkWidget(); String[] items = model.getItems(); int lastIndex = items.length - 1; if (start < 0 || start > lastIndex || end < 0 || end > lastIndex || end < start) { error(SWT.ERROR_INVALID_RANGE); } int selectionIndex = getSelectionIndex(); for (int i = start; i <= end; i++) { int index = indexOf(items[i]); if (selectionIndex == index) { deselect(index); } } model.remove(start, end); } /** * Searches the receiver's list starting at the first item * until an item is found that is equal to the argument, * and removes that item from the list. * * @param string the item to remove * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the string is null</li> * <li>ERROR_INVALID_ARGUMENT - if the string is not found in the list</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> */ public void remove(String string) { checkWidget(); int indexOfThisString = indexOf(string); int selectionIndex = getSelectionIndex(); if (selectionIndex == indexOfThisString) { deselect(indexOfThisString); } model.remove(string); } /** * Removes all of the items from the receiver's list and clear the * contents of receiver's text field. * <p> * @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 removeAll() { checkWidget(); deselectAll(); model.removeAll(); } /** * Sets the text of the item in the receiver's list at the given * zero-relative index to the string argument. This is equivalent * to removing the old item at the index, and then adding the new * item at that index. * * @param index the index for the item * @param string the new text for the item * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</li> * <li>ERROR_NULL_ARGUMENT - if the string 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> */ public void setItem(int index, String string) { checkWidget(); model.setItem(index, string); } /** * Sets the receiver's list to be the given array of items. * * @param items the array of items * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the items array is null</li> * <li>ERROR_INVALID_ARGUMENT - if an item in the items array 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> */ public void setItems(String... items) { checkWidget(); model.setItems(items); } /** * Returns the item at the given, zero-relative index in the * receiver's list. Throws an exception if the index is out * of range. * * @param index the index of the item to return * @return the item at the given index * * @exception IllegalArgumentException <ul> * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</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> */ public String getItem(int index) { checkWidget(); return model.getItem(index); } /** * Returns a (possibly empty) array of <code>String</code>s which are * the items in the receiver's list. * <p> * Note: This is not the actual structure used by the receiver * to maintain its list of items, so modifying the array will * not affect the receiver. * </p> * * @return the items in the receiver's list * * @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 String[] getItems() { checkWidget(); return model.getItems(); } /** * Returns the number of items contained in the receiver's list. * * @return the number of items * * @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 getItemCount() { checkWidget(); return model.getItemCount(); } /** * Returns the height of the area which would be used to * display <em>one</em> of the items in the receiver's list. * * @return the height of one item * * @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 1.3 */ public int getItemHeight() { checkWidget(); int charHeight = TextSizeUtil.getCharHeight(getFont()); int padding = 2 * LIST_ITEM_PADDING; return charHeight + padding; } /** * Sets the number of items that are visible in the drop * down portion of the receiver's list. * <p> * Note: This operation is a hint and is not supported on * platforms that do not have this concept. * </p> * * @param count the new number of items to be visible * * @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 setVisibleItemCount(int count) { checkWidget(); if (count >= 0) { visibleCount = count; } } /** * Gets the number of items that are visible in the drop * down portion of the receiver's list. * <p> * Note: This operation is a hint and is not supported on * platforms that do not have this concept. * </p> * * @return the number of items that are visible * * @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 getVisibleItemCount() { checkWidget(); return visibleCount; } /** * Marks the receiver's list 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> * * @since 1.3 */ public void setListVisible(boolean visible) { checkWidget(); dropped = visible; } /** * Returns <code>true</code> if the receiver's list 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 list'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> * * @since 1.3 */ public boolean getListVisible() { checkWidget(); return dropped; } /** * Searches the receiver's list starting at the first item * (index 0) until an item is found that is equal to the * argument, and returns the index of that item. If no item * is found, returns -1. * * @param string the search item * @return the index of the item * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the string 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> */ public int indexOf(String string) { checkWidget(); return indexOf(string, 0); } /** * Searches the receiver's list starting at the given, * zero-relative index until an item is found that is equal * to the argument, and returns the index of that item. If * no item is found or the starting index is out of range, * returns -1. * * @param string the search item * @param start the zero-relative index at which to begin the search * @return the index of the item * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the string 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> */ public int indexOf(String string, int start) { checkWidget(); if (string == null) { error(SWT.ERROR_NULL_ARGUMENT); } return model.indexOf(string, start); } /** * Returns a string containing a copy of the contents of the * receiver's text field, or an empty string if there are no * contents. * * @return the receiver's text * * @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 String getText() { checkWidget(); String result = ""; if ((style & SWT.READ_ONLY) != 0) { int idx = model.getSelectionIndex(); if (idx != -1) { result = model.getItem(idx); } } else { result = text; } return result; } /** * Sets the contents of the receiver's text field to the given string. * <p> * Note: The text field in a <code>Combo</code> is typically only capable of * displaying a single line of text. Thus, setting the text to a string * containing line breaks or other special characters will probably cause it * to display incorrectly. * </p> * * @param string the new text * @exception IllegalArgumentException * <ul> * <li>ERROR_NULL_ARGUMENT - if the string 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> */ public void setText(String string) { checkWidget(); if (string == null) { error(SWT.ERROR_NULL_ARGUMENT); } if ((style & SWT.READ_ONLY) != 0) { int index = indexOf(string); if (index != -1) { select(index); selection.x = 0; selection.y = string.length(); } } else if (internalSetText(string, true)) { resetSelection(); notifyListeners(SWT.Modify, new Event()); } } /** * Returns the maximum number of characters that the receiver's * text field is capable of holding. If this has not been changed * by <code>setTextLimit()</code>, it will be the constant * <code>Combo.LIMIT</code>. * * @return the text limit * * @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 #LIMIT * @since 1.3 */ public int getTextLimit() { checkWidget(); return textLimit; } /** * Sets the maximum number of characters that the receiver's * text field is capable of holding to be the argument. * <p> * To reset this value to the default, use <code>setTextLimit(Combo.LIMIT)</code>. * Specifying a limit value larger than <code>Combo.LIMIT</code> sets the * receiver's limit to <code>Combo.LIMIT</code>. * </p> * @param limit new text limit * * @exception IllegalArgumentException <ul> * <li>ERROR_CANNOT_BE_ZERO - if the limit is zero</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 #LIMIT * @since 1.3 */ public void setTextLimit(int limit) { checkWidget(); if (limit == 0) { error(SWT.ERROR_CANNOT_BE_ZERO); } if (limit > 0) { textLimit = limit; } else { textLimit = LIMIT; } } /** * Returns the height of the receivers's text field. * * @return the text height * * @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 1.3 */ public int getTextHeight() { checkWidget(); Font font = getFont(); int fontSize = FontUtil.getData(font).getHeight(); return (int) Math.floor(fontSize * LINE_HEIGHT_FACTOR); } // TODO [rst] Revise: In SWT, a width or height hint of 0 does not result in // the DEFAULT_WIDTH/HEIGHT. @Override public Point computeSize(int wHint, int hHint, boolean changed) { checkWidget(); int width = 0; int height = TextSizeUtil.getCharHeight(getFont()); if (wHint == SWT.DEFAULT || hHint == SWT.DEFAULT) { String[] items = model.getItems(); for (int i = 0; i < items.length; i++) { if (!"".equals(items[i])) { Point extent = TextSizeUtil.stringExtent(getFont(), items[i]); width = Math.max(width, extent.x + 10); } } } BoxDimensions fieldPadding = getFieldPadding(); int buttonWidth = getButtonWidth(); if (width != 0) { width += fieldPadding.left + fieldPadding.right + buttonWidth; } if (height != 0) { height += fieldPadding.top + fieldPadding.bottom; // TODO [rst] Workaround for two missing pixels (, p are cut off), revise height += 2; } if (width == 0) { width = DEFAULT_WIDTH; } if (height == 0) { height = DEFAULT_HEIGHT; } if (wHint != SWT.DEFAULT) { width = wHint; } if (hHint != SWT.DEFAULT) { height = hHint; } BoxDimensions border = getBorder(); height += border.top + border.bottom; width += border.left + border.right; return new Point(width, height); } /** * Adds the listener to the collection of listeners who will * be notified when the receiver's selection changes, by sending * it one of the messages defined in the <code>SelectionListener</code> * interface. * <p> * <code>widgetSelected</code> is called when the combo's list selection changes. * <code>widgetDefaultSelected</code> is typically called when ENTER is pressed the combo's text area. * </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) { SWT.error(SWT.ERROR_NULL_ARGUMENT); } TypedListener typedListener = new TypedListener(listener); addListener(SWT.Selection, typedListener); addListener(SWT.DefaultSelection, typedListener); } /** * Removes the listener from the collection of listeners who will * be notified when the receiver's selection 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) { SWT.error(SWT.ERROR_NULL_ARGUMENT); } removeListener(SWT.Selection, listener); removeListener(SWT.DefaultSelection, listener); } /** * Adds the listener to the collection of listeners who will * be notified when the receiver's text is modified, by sending * it one of the messages defined in the <code>ModifyListener</code> * interface. * * @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 ModifyListener * @see #removeModifyListener */ public void addModifyListener(ModifyListener listener) { checkWidget(); if (listener == null) { SWT.error(SWT.ERROR_NULL_ARGUMENT); } TypedListener typedListener = new TypedListener(listener); addListener(SWT.Modify, typedListener); } /** * Removes the listener from the collection of listeners who will * be notified when the receiver's text is modified. * * @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 ModifyListener * @see #addModifyListener */ public void removeModifyListener(ModifyListener listener) { checkWidget(); if (listener == null) { SWT.error(SWT.ERROR_NULL_ARGUMENT); } removeListener(SWT.Modify, listener); } /** * Adds the listener to the collection of listeners who will * be notified when the receiver's text is verified, by sending * it one of the messages defined in the <code>VerifyListener</code> * interface. * * @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 VerifyListener * @see #removeVerifyListener */ public void addVerifyListener(VerifyListener listener) { checkWidget(); if (listener == null) { error(SWT.ERROR_NULL_ARGUMENT); } TypedListener typedListener = new TypedListener(listener); addListener(SWT.Verify, typedListener); } /** * Removes the listener from the collection of listeners who will * be notified when the control is verified. * * @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 VerifyListener * @see #addVerifyListener */ public void removeVerifyListener(VerifyListener listener) { checkWidget(); if (listener == null) { error(SWT.ERROR_NULL_ARGUMENT); } removeListener(SWT.Verify, listener); } @Override @SuppressWarnings("unchecked") public <T> T getAdapter(Class<T> adapter) { if (adapter == ITextAdapter.class) { if (textAdapter == null) { textAdapter = new ITextAdapter() { @Override public void setText(String text) { if (internalSetText(text, true)) { adjustSelection(); notifyListeners(SWT.Modify, new Event()); } } }; } return (T) textAdapter; } if (adapter == WidgetLCA.class) { return (T) ComboLCA.INSTANCE; } return super.getAdapter(adapter); } @Override boolean isTabGroup() { return true; } @Override String getNameText() { return getText(); } private void updateText() { if ((style & SWT.READ_ONLY) == 0) { int selectionIndex = getSelectionIndex(); String text = selectionIndex != -1 ? getItem(selectionIndex) : ""; if (internalSetText(text, false)) { adjustSelection(); notifyListeners(SWT.Modify, new Event()); } } else { notifyListeners(SWT.Modify, new Event()); } } private boolean internalSetText(String text, boolean updateSelection) { String verifiedText = verifyText(text, 0, this.text.length()); if (verifiedText != null) { if (updateSelection) { int index = -1; String[] items = model.getItems(); for (int i = 0; index == -1 && i < items.length; i++) { if (verifiedText.equals(items[i])) { index = i; } } model.setSelection(index); } if (verifiedText.length() > textLimit) { this.text = verifiedText.substring(0, textLimit); } else { this.text = verifiedText; } } return verifiedText != null; } private String verifyText(String text, int start, int end) { Event event = new Event(); event.text = text; event.start = start; event.end = end; notifyListeners(SWT.Verify, event); /* * It is possible (but unlikely), that application code could have disposed * the widget in the verify event. If this happens, answer null to cancel * the operation. */ String result; if (event.doit && !isDisposed()) { result = event.text; } else { return null; } return result; } private void resetSelection() { selection.x = 0; selection.y = 0; } private void adjustSelection() { selection.x = Math.min(selection.x, text.length()); selection.y = Math.min(selection.y, text.length()); } private BoxDimensions getFieldPadding() { return getThemeAdapter().getFieldPadding(this); } private int getButtonWidth() { return getThemeAdapter().getButtonWidth(this); } private ComboThemeAdapter getThemeAdapter() { return (ComboThemeAdapter) getAdapter(ThemeAdapter.class); } private static int checkStyle(int style) { int result = style; /* * Feature in Windows. It is not possible to create * a combo box that has a border using Windows style * bits. All combo boxes draw their own border and * do not use the standard Windows border styles. * Therefore, no matter what style bits are specified, * clear the BORDER bits so that the SWT style will * match the Windows widget. * * The Windows behavior is currently implemented on * all platforms. */ result &= ~SWT.BORDER; /* * Even though it is legal to create this widget * with scroll bars, they serve no useful purpose * because they do not automatically scroll the * widget's client area. The fix is to clear * the SWT style. */ result &= ~(SWT.H_SCROLL | SWT.V_SCROLL); result = checkBits(result, SWT.DROP_DOWN, SWT.SIMPLE, 0, 0, 0, 0); if ((result & SWT.SIMPLE) != 0) { return result & ~SWT.READ_ONLY; } return result; } }