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/*******************************************************************************
 * Copyright (c) 2000, 2019 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Paul Pazderski - Bug 349112: allow setting alignment on the text field
 *******************************************************************************/
package org.eclipse.swt.custom;


import java.util.function.*;

import org.eclipse.swt.*;
import org.eclipse.swt.accessibility.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

/**
 * The CCombo class represents a selectable user interface object
 * that combines a text field and a list and issues notification
 * when an item is selected from the list.
 * 

* CCombo was written to work around certain limitations in the native * combo box. Specifically, on win32, the height of a CCombo can be set; * attempts to set the height of a Combo are ignored. CCombo can be used * anywhere that having the increased flexibility is more important than * getting native L&F, but the decision should not be taken lightly. * There is no strict requirement that CCombo look or behave the same as * the native combo box. *

*

* Note that although this class is a subclass of Composite, * it does not make sense to add children to it, or set a layout on it. *

*
*
Styles: *
BORDER, READ_ONLY, FLAT, LEAD, LEFT, CENTER, TRAIL, RIGHT
*
Events: *
DefaultSelection, Modify, Selection, Verify
*
* * @see CCombo snippets * @see SWT Example: CustomControlExample * @see Sample code and further information */ public class CCombo extends Composite { Text text; List list; int visibleItemCount = 5; Shell popup; Button arrow; boolean hasFocus; Listener listener, filter; Color foreground, background; Font font; Shell _shell; static final String PACKAGE_PREFIX = "org.eclipse.swt.custom."; //$NON-NLS-1$ /** * Constructs a new instance of this class given its parent * and a style value describing its behavior and appearance. *

* The style value is either one of the style constants defined in * class SWT which is applicable to instances of this * class, or must be built by bitwise OR'ing together * (that is, using the int "|" operator) two or more * of those SWT style constants. The class description * lists the style constants that are applicable to the class. * Style bits are also inherited from superclasses. *

* * @param parent a widget which will be the parent of the new instance (cannot be null) * @param style the style of widget to construct * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the parent is null
  • *
* @exception SWTException
    *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent
  • *
* * @see SWT#BORDER * @see SWT#READ_ONLY * @see SWT#FLAT * @see SWT#LEAD * @see SWT#LEFT * @see SWT#CENTER * @see SWT#RIGHT * @see SWT#TRAIL * @see Widget#getStyle() */ public CCombo (Composite parent, int style) { super (parent, style = checkStyle (style)); _shell = super.getShell (); listener = event -> { if (isDisposed ()) return; if (popup == event.widget) { popupEvent (event); return; } if (text == event.widget) { textEvent (event); return; } if (list == event.widget) { listEvent (event); return; } if (arrow == event.widget) { arrowEvent (event); return; } if (CCombo.this == event.widget) { comboEvent (event); return; } if (getShell () == event.widget) { getDisplay().asyncExec(() -> { if (isDisposed ()) return; handleFocus (SWT.FocusOut); }); } }; createText(style); int arrowStyle = SWT.ARROW | SWT.DOWN; if ((style & SWT.FLAT) != 0) arrowStyle |= SWT.FLAT; arrow = new Button (this, arrowStyle); filter = event -> { if (isDisposed ()) return; if (event.type == SWT.Selection) { if (event.widget instanceof ScrollBar) { handleScroll(event); } return; } if (event.widget instanceof Control) { Shell shell = ((Control)event.widget).getShell (); if (shell == CCombo.this.getShell ()) { handleFocus (SWT.FocusOut); } } }; int [] comboEvents = {SWT.Dispose, SWT.FocusIn, SWT.Move, SWT.Resize, SWT.FocusOut}; for (int comboEvent : comboEvents) this.addListener (comboEvent, listener); int [] arrowEvents = {SWT.DragDetect, SWT.MouseDown, SWT.MouseEnter, SWT.MouseExit, SWT.MouseHover, SWT.MouseMove, SWT.MouseUp, SWT.MouseWheel, SWT.Selection, SWT.FocusIn}; for (int arrowEvent : arrowEvents) arrow.addListener (arrowEvent, listener); createPopup(null, -1); if ((style & SWT.SIMPLE) == 0) { int itemHeight = list.getItemHeight (); if (itemHeight != 0) { int maxHeight = getMonitor().getClientArea().height / 3; visibleItemCount = Math.max(visibleItemCount, maxHeight / itemHeight); } } initAccessible(); } static int checkStyle (int style) { int mask = SWT.BORDER | SWT.READ_ONLY | SWT.FLAT | SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT | SWT.LEAD | SWT.CENTER | SWT.TRAIL; return SWT.NO_FOCUS | (style & mask); } void createText(int comboStyle) { String textValue = null, tooltip = null; Point selection = null; int limit = 0; boolean enabled = false, focus = false, editable = false; Font font = null; Color fg = null, bg = null; Menu menu = null; if (text != null) { textValue = text.getText(); tooltip = text.getToolTipText(); selection = text.getSelection(); limit = text.getTextLimit(); enabled = text.isEnabled(); editable = text.getEditable(); focus = text.isFocusControl(); font = text.getFont(); fg = text.getForeground(); bg = text.getBackground(); menu = text.getMenu(); text.dispose(); } int textStyle = SWT.SINGLE; if ((comboStyle & SWT.READ_ONLY) != 0) textStyle |= SWT.READ_ONLY; if ((comboStyle & SWT.FLAT) != 0) textStyle |= SWT.FLAT; textStyle |= comboStyle & (SWT.LEAD | SWT.CENTER | SWT.TRAIL); text = new Text (this, textStyle); if (textValue != null) { text.setText(textValue); text.setToolTipText(tooltip); if (selection != null) text.setSelection(selection); text.setTextLimit(limit); text.setEnabled(enabled); text.setEditable(editable); if (focus) text.setFocus(); if (font != null && !font.isDisposed()) text.setFont(font); if (fg != null && !fg.isDisposed()) text.setForeground(fg); if (bg != null && !bg.isDisposed()) text.setBackground(bg); if (menu != null && !menu.isDisposed()) text.setMenu(menu); internalLayout(true); } int [] textEvents = {SWT.DefaultSelection, SWT.DragDetect, SWT.KeyDown, SWT.KeyUp, SWT.MenuDetect, SWT.Modify, SWT.MouseDown, SWT.MouseUp, SWT.MouseDoubleClick, SWT.MouseEnter, SWT.MouseExit, SWT.MouseHover, SWT.MouseMove, SWT.MouseWheel, SWT.Traverse, SWT.FocusIn, SWT.Verify}; for (int textEvent : textEvents) text.addListener (textEvent, listener); } /** * Adds the argument to the end of the receiver's list. *

* Note: If control characters like '\n', '\t' etc. are used * in the string, then the behavior is platform dependent. *

* @param string the new item * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see #add(String,int) */ public void add (String string) { checkWidget(); if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); list.add (string); } /** * Adds the argument to the receiver's list at the given * zero-relative index. *

* Note: To add an item at the end of the list, use the * result of calling getItemCount() as the * index or use add(String). *

* Also note, if control characters like '\n', '\t' etc. are used * in the string, then the behavior is platform dependent. *

* * @param string the new item * @param index the index for the item * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list (inclusive)
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see #add(String) */ public void add (String string, int index) { checkWidget(); if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); list.add (string, index); } /** * 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 ModifyListener * interface. * * @param listener the listener which should be notified * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the listener is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see ModifyListener * @see #removeModifyListener */ public void addModifyListener (ModifyListener listener) { addTypedListener(listener, SWT.Modify); } /** * Adds the listener to the collection of listeners who will * be notified when the user changes the receiver's selection, by sending * it one of the messages defined in the SelectionListener * interface. *

* widgetSelected is called when the combo's list selection changes. * widgetDefaultSelected is typically called when ENTER is pressed the combo's text area. *

* * @param listener the listener which should be notified when the user changes the receiver's selection * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the listener is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see SelectionListener * @see #removeSelectionListener * @see SelectionEvent */ public void addSelectionListener(SelectionListener listener) { addTypedListener(listener, SWT.Selection, SWT.DefaultSelection); } /** * 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 VerifyListener * interface. * * @param listener the listener which should be notified * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the listener is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see VerifyListener * @see #removeVerifyListener * * @since 3.3 */ public void addVerifyListener (VerifyListener listener) { addTypedListener(listener, SWT.Verify); } void arrowEvent (Event event) { switch (event.type) { case SWT.FocusIn: { handleFocus (SWT.FocusIn); break; } case SWT.DragDetect: case SWT.MouseDown: case SWT.MouseUp: case SWT.MouseMove: case SWT.MouseEnter: case SWT.MouseExit: case SWT.MouseHover: { Point pt = getDisplay ().map (arrow, this, event.x, event.y); event.x = pt.x; event.y = pt.y; notifyListeners (event.type, event); event.type = SWT.None; break; } case SWT.MouseWheel: { Point pt = getDisplay ().map (arrow, this, event.x, event.y); event.x = pt.x; event.y = pt.y; notifyListeners (SWT.MouseWheel, event); event.type = SWT.None; if (isDisposed ()) break; if (!event.doit) break; if (event.count != 0) { event.doit = false; int oldIndex = getSelectionIndex (); if (event.count > 0) { select (Math.max (oldIndex - 1, 0)); } else { select (Math.min (oldIndex + 1, getItemCount () - 1)); } if (oldIndex != getSelectionIndex ()) { Event e = new Event(); e.time = event.time; e.stateMask = event.stateMask; notifyListeners (SWT.Selection, e); } if (isDisposed ()) break; } break; } case SWT.Selection: { text.setFocus(); dropDown (!isDropped ()); break; } } } @Override protected void checkSubclass () { String name = getClass ().getName (); int index = name.lastIndexOf ('.'); if (!name.substring (0, index + 1).equals (PACKAGE_PREFIX)) { SWT.error (SWT.ERROR_INVALID_SUBCLASS); } } /** * 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. *

* Note: To clear the selected items in the receiver's list, * use deselectAll(). *

* * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see #deselectAll */ public void clearSelection () { checkWidget (); text.clearSelection (); list.deselectAll (); } void comboEvent (Event event) { switch (event.type) { case SWT.Dispose: removeListener(SWT.Dispose, listener); notifyListeners(SWT.Dispose, event); event.type = SWT.None; if (popup != null && !popup.isDisposed ()) { list.removeListener (SWT.Dispose, listener); popup.dispose (); } Shell shell = getShell (); shell.removeListener (SWT.Deactivate, listener); Display display = getDisplay (); display.removeFilter (SWT.FocusIn, filter); popup = null; text = null; list = null; arrow = null; _shell = null; break; case SWT.FocusIn: Control focusControl = getDisplay ().getFocusControl (); if (focusControl == arrow || focusControl == list) return; if (isDropped()) { list.setFocus(); } else { text.setFocus(); } break; case SWT.FocusOut: text.clearSelection(); break; case SWT.Move: dropDown (false); break; case SWT.Resize: internalLayout (false); break; } } @Override public Point computeSize (int wHint, int hHint, boolean changed) { checkWidget (); int width = 0, height = 0; GC gc = new GC (text); int spacer = gc.stringExtent (" ").x; //$NON-NLS-1$ int textWidth = gc.stringExtent (text.getText ()).x; for (String item : list.getItems ()) { textWidth = Math.max (gc.stringExtent (item).x, textWidth); } gc.dispose (); Point textSize = text.computeSize (SWT.DEFAULT, SWT.DEFAULT, changed); Point arrowSize = arrow.computeSize (SWT.DEFAULT, SWT.DEFAULT, changed); Point listSize = list.computeSize (SWT.DEFAULT, SWT.DEFAULT, changed); int borderWidth = getBorderWidth (); height = Math.max (textSize.y, arrowSize.y); width = Math.max (textWidth + 2*spacer + arrowSize.x + 2*borderWidth, listSize.x); if (wHint != SWT.DEFAULT) width = wHint; if (hHint != SWT.DEFAULT) height = hHint; return new Point (width + 2*borderWidth, height + 2*borderWidth); } /** * Copies the selected text. *

* The current selection is copied to the clipboard. *

* * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.3 */ public void copy () { checkWidget (); text.copy (); } void createPopup(String[] items, int selectionIndex) { // create shell and list popup = new Shell (getShell (), SWT.NO_TRIM | SWT.ON_TOP); int style = getStyle (); int listStyle = SWT.SINGLE | SWT.V_SCROLL | SWT.H_SCROLL; if ((style & SWT.FLAT) != 0) listStyle |= SWT.FLAT; if ((style & SWT.RIGHT_TO_LEFT) != 0) listStyle |= SWT.RIGHT_TO_LEFT; if ((style & SWT.LEFT_TO_RIGHT) != 0) listStyle |= SWT.LEFT_TO_RIGHT; list = new List (popup, listStyle); if (font != null) list.setFont (font); if (foreground != null) list.setForeground (foreground); if (background != null) list.setBackground (background); int [] popupEvents = {SWT.Close, SWT.Paint}; for (int popupEvent : popupEvents) popup.addListener (popupEvent, listener); int [] listEvents = {SWT.MouseUp, SWT.Selection, SWT.Traverse, SWT.KeyDown, SWT.KeyUp, SWT.FocusIn, SWT.FocusOut, SWT.Dispose}; for (int listEvent : listEvents) list.addListener (listEvent, listener); if (items != null) list.setItems (items); if (selectionIndex != -1) list.setSelection (selectionIndex); } /** * Cuts the selected text. *

* The current selection is first copied to the * clipboard and then deleted from the widget. *

* * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.3 */ public void cut () { checkWidget (); text.cut (); } /** * 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
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void deselect (int index) { checkWidget (); if (0 <= index && index < list.getItemCount () && index == list.getSelectionIndex() && text.getText().equals(list.getItem(index))) { text.setText(""); //$NON-NLS-1$ list.deselect (index); } } /** * Deselects all selected items in the receiver's list. *

* Note: To clear the selection in the receiver's text field, * use clearSelection(). *

* * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see #clearSelection */ public void deselectAll () { checkWidget (); text.setText(""); //$NON-NLS-1$ list.deselectAll (); } void dropDown (boolean drop) { if (drop == isDropped ()) return; Display display = getDisplay (); if (!drop) { display.removeFilter (SWT.Selection, filter); popup.setVisible (false); if (!isDisposed () && isFocusControl()) { text.setFocus(); } return; } if (!isVisible()) return; if (getShell() != popup.getParent ()) { String[] items = list.getItems (); int selectionIndex = list.getSelectionIndex (); list.removeListener (SWT.Dispose, listener); popup.dispose(); popup = null; list = null; createPopup (items, selectionIndex); } Point comboSize = getSize (); int itemCount = list.getItemCount (); itemCount = (itemCount == 0) ? visibleItemCount : Math.min(visibleItemCount, itemCount); int itemHeight = list.getItemHeight () * itemCount; Point listSize = list.computeSize (SWT.DEFAULT, itemHeight, false); Rectangle displayRect = getMonitor ().getClientArea (); list.setBounds (1, 1, Math.max (comboSize.x - 2, Math.min(listSize.x, displayRect.width - 2)), listSize.y); int index = list.getSelectionIndex (); if (index != -1) list.setTopIndex (index); Rectangle listRect = list.getBounds (); Rectangle parentRect = display.map (getParent (), null, getBounds ()); int width = listRect.width + 2; int height = listRect.height + 2; int x = parentRect.x; if (x + width > displayRect.x + displayRect.width) { x = displayRect.x + displayRect.width - width; } int y = parentRect.y + comboSize.y; if (y + height > displayRect.y + displayRect.height) { int popUpwardsHeight = (parentRect.y - height < displayRect.y) ? parentRect.y - displayRect.y : height; int popDownwardsHeight = displayRect.y + displayRect.height - y; if (popUpwardsHeight > popDownwardsHeight) { height = popUpwardsHeight; y = parentRect.y - popUpwardsHeight; } else { height = popDownwardsHeight; } listRect.height = height - 2; } /* * Invisible HScrollBar lead to empty space at end of CCombo drop-down. * Fix is to reduce height of list and shell in that case, bug 388126. */ ScrollBar hBar = list.getHorizontalBar(); int emptyHBarSpace = hBar.isVisible () ? 0 : hBar.getSize ().y; list.setSize (listRect.width, listRect.height - emptyHBarSpace); popup.setBounds (x, y, width, height - emptyHBarSpace); popup.setVisible (true); if (isFocusControl()) list.setFocus (); /* * Add a filter to listen to scrolling of the parent composite, when the * drop-down is visible. Remove the filter when drop-down is not * visible. */ display.removeFilter (SWT.Selection, filter); display.addFilter (SWT.Selection, filter); } /* * Return the lowercase of the first non-'&' character following * an '&' character in the given string. If there are no '&' * characters in the given string, return '\0'. */ char _findMnemonic (String string) { if (string == null) return '\0'; int index = 0; int length = string.length (); do { while (index < length && string.charAt (index) != '&') index++; if (++index >= length) return '\0'; if (string.charAt (index) != '&') return Character.toLowerCase (string.charAt (index)); index++; } while (index < length); return '\0'; } /* * Return the Label immediately preceding the receiver in the z-order, * or null if none. */ String getAssociatedLabel () { Control[] siblings = getParent ().getChildren (); for (int i = 0; i < siblings.length; i++) { if (siblings [i] == this) { if (i > 0) { Control sibling = siblings [i-1]; if (sibling instanceof Label) return ((Label) sibling).getText(); if (sibling instanceof CLabel) return ((CLabel) sibling).getText(); } break; } } return null; } /** * Returns the horizontal alignment. * The alignment style (LEFT, CENTER or RIGHT) is returned. * * @return SWT.LEFT, SWT.RIGHT or SWT.CENTER * @since 3.113 */ public int getAlignment() { return text.getStyle() & (SWT.LEFT | SWT.CENTER | SWT.RIGHT); } @Override public Control [] getChildren () { checkWidget(); return new Control [0]; } /** * Gets the editable state. * * @return whether or not the receiver is editable * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.0 */ public boolean getEditable () { checkWidget (); return text.getEditable(); } /** * 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
    *
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public String getItem (int index) { checkWidget(); return list.getItem (index); } /** * Returns the number of items contained in the receiver's list. * * @return the number of items * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getItemCount () { checkWidget (); return list.getItemCount (); } /** * Returns the height of the area which would be used to * display one of the items in the receiver's list. * * @return the height of one item * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getItemHeight () { checkWidget (); return list.getItemHeight (); } /** * Returns an array of Strings which are the items * in the receiver's list. *

* 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. *

* * @return the items in the receiver's list * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public String [] getItems () { checkWidget (); return list.getItems (); } /** * Returns true if the receiver's list is visible, * and false otherwise. *

* 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. *

* * @return the receiver's list's visibility state * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.4 */ public boolean getListVisible () { checkWidget (); return isDropped(); } @Override public Menu getMenu() { return text.getMenu(); } /** * Returns a Point whose x coordinate is the start * of the selection in the receiver's text field, and whose y * coordinate is the end of the selection. The returned values * are zero-relative. An "empty" selection as indicated by * the the x and y coordinates having the same value. * * @return a point representing the selection start and end * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public Point getSelection () { checkWidget (); return text.getSelection (); } /** * 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
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getSelectionIndex () { checkWidget (); return list.getSelectionIndex (); } @Override public Shell getShell () { checkWidget (); Shell shell = super.getShell (); if (shell != _shell) { if (_shell != null && !_shell.isDisposed ()) { _shell.removeListener (SWT.Deactivate, listener); } _shell = shell; } return _shell; } @Override public int getStyle () { int style = super.getStyle (); style &= ~SWT.READ_ONLY; if (!text.getEditable()) style |= SWT.READ_ONLY; style &= ~(SWT.LEFT | SWT.CENTER | SWT.RIGHT); style |= getAlignment(); return style; } /** * Returns a string containing a copy of the contents of the * receiver's text field. * * @return the receiver's text * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public String getText () { checkWidget (); return text.getText (); } /** * Returns the height of the receivers's text field. * * @return the text height * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getTextHeight () { checkWidget (); return text.getLineHeight (); } /** * Returns the maximum number of characters that the receiver's * text field is capable of holding. If this has not been changed * by setTextLimit(), it will be the constant * Combo.LIMIT. * * @return the text limit * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int getTextLimit () { checkWidget (); return text.getTextLimit (); } /** * Gets the number of items that are visible in the drop * down portion of the receiver's list. * * @return the number of items that are visible * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.0 */ public int getVisibleItemCount () { checkWidget (); return visibleItemCount; } void handleFocus (int type) { switch (type) { case SWT.FocusIn: { if (hasFocus) return; if (getEditable ()) text.selectAll (); hasFocus = true; Shell shell = getShell (); shell.removeListener (SWT.Deactivate, listener); shell.addListener (SWT.Deactivate, listener); Display display = getDisplay (); display.removeFilter (SWT.FocusIn, filter); display.addFilter (SWT.FocusIn, filter); Event e = new Event (); notifyListeners (SWT.FocusIn, e); break; } case SWT.FocusOut: { if (!hasFocus) return; Control focusControl = getDisplay ().getFocusControl (); if (focusControl == arrow || focusControl == list || focusControl == text) return; hasFocus = false; Shell shell = getShell (); shell.removeListener(SWT.Deactivate, listener); Display display = getDisplay (); display.removeFilter (SWT.FocusIn, filter); Event e = new Event (); notifyListeners (SWT.FocusOut, e); break; } } } void handleScroll(Event event) { ScrollBar scrollBar = (ScrollBar)event.widget; Control scrollableParent = scrollBar.getParent(); if (scrollableParent.equals(list)) return; if (isParentScrolling(scrollableParent)) dropDown(false); } /** * 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
    *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int indexOf (String string) { checkWidget (); if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); return list.indexOf (string); } /** * 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
    *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public int indexOf (String string, int start) { checkWidget (); if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); return list.indexOf (string, start); } void initAccessible() { AccessibleAdapter accessibleAdapter = new AccessibleAdapter () { @Override public void getName (AccessibleEvent e) { String name = null; String text = getAssociatedLabel (); if (text != null) { name = stripMnemonic (text); } e.result = name; } @Override public void getKeyboardShortcut(AccessibleEvent e) { String shortcut = null; String text = getAssociatedLabel (); if (text != null) { char mnemonic = _findMnemonic (text); if (mnemonic != '\0') { shortcut = "Alt+"+mnemonic; //$NON-NLS-1$ } } e.result = shortcut; } @Override public void getHelp (AccessibleEvent e) { e.result = getToolTipText (); } }; getAccessible ().addAccessibleListener (accessibleAdapter); text.getAccessible ().addAccessibleListener (accessibleAdapter); list.getAccessible ().addAccessibleListener (accessibleAdapter); arrow.getAccessible ().addAccessibleListener (new AccessibleAdapter() { @Override public void getName (AccessibleEvent e) { e.result = isDropped () ? SWT.getMessage ("SWT_Close") : SWT.getMessage ("SWT_Open"); //$NON-NLS-1$ //$NON-NLS-2$ } @Override public void getKeyboardShortcut (AccessibleEvent e) { e.result = "Alt+Down Arrow"; //$NON-NLS-1$ } @Override public void getHelp (AccessibleEvent e) { e.result = getToolTipText (); } }); getAccessible().addAccessibleTextListener (new AccessibleTextAdapter() { @Override public void getCaretOffset (AccessibleTextEvent e) { e.offset = text.getCaretPosition (); } @Override public void getSelectionRange(AccessibleTextEvent e) { Point sel = text.getSelection(); e.offset = sel.x; e.length = sel.y - sel.x; } }); getAccessible().addAccessibleControlListener (new AccessibleControlAdapter() { @Override public void getChildAtPoint (AccessibleControlEvent e) { Point testPoint = toControl (e.x, e.y); if (getBounds ().contains (testPoint)) { e.childID = ACC.CHILDID_SELF; } } @Override public void getLocation (AccessibleControlEvent e) { Rectangle location = getBounds (); Point pt = getParent().toDisplay (location.x, location.y); e.x = pt.x; e.y = pt.y; e.width = location.width; e.height = location.height; } @Override public void getChildCount (AccessibleControlEvent e) { e.detail = 0; } @Override public void getRole (AccessibleControlEvent e) { e.detail = ACC.ROLE_COMBOBOX; } @Override public void getState (AccessibleControlEvent e) { e.detail = ACC.STATE_NORMAL; } @Override public void getValue (AccessibleControlEvent e) { e.result = getText (); } }); text.getAccessible ().addAccessibleControlListener (new AccessibleControlAdapter () { @Override public void getRole (AccessibleControlEvent e) { e.detail = text.getEditable () ? ACC.ROLE_TEXT : ACC.ROLE_LABEL; } }); arrow.getAccessible ().addAccessibleControlListener (new AccessibleControlAdapter() { @Override public void getDefaultAction (AccessibleControlEvent e) { e.result = isDropped () ? SWT.getMessage ("SWT_Close") : SWT.getMessage ("SWT_Open"); //$NON-NLS-1$ //$NON-NLS-2$ } }); } boolean isDropped () { return !isDisposed() && popup.getVisible (); } @Override public boolean isFocusControl () { checkWidget(); Predicate checkFocusControl = control -> (control != null && !control.isDisposed() && control.isFocusControl ()); if (checkFocusControl.test(text) || checkFocusControl.test(arrow) || checkFocusControl.test(list) || checkFocusControl.test(popup)) { return true; } return super.isFocusControl (); } boolean isParentScrolling(Control scrollableParent) { Control parent = this.getParent(); while (parent != null) { if (parent.equals(scrollableParent)) return true; parent = parent.getParent(); } return false; } void internalLayout (boolean changed) { if (isDropped ()) dropDown (false); Rectangle rect = getClientArea (); int width = rect.width; int height = rect.height; Point arrowSize = arrow.computeSize (SWT.DEFAULT, height, changed); text.setBounds (0, 0, width - arrowSize.x, height); arrow.setBounds (width - arrowSize.x, 0, arrowSize.x, arrowSize.y); } void listEvent (Event event) { switch (event.type) { case SWT.Dispose: if (getShell () != popup.getParent ()) { String[] items = list.getItems (); int selectionIndex = list.getSelectionIndex (); popup = null; list = null; createPopup (items, selectionIndex); } break; case SWT.FocusIn: { handleFocus (SWT.FocusIn); break; } case SWT.FocusOut: { /* * Behavior in Windows, GTK & Cocoa: When the arrow button is pressed * with the popup list visible, the following events are received- * popup control receives a deactivate event, * list receives focus lost event, and then * arrow button receives a selection event. * If we hide the popup in the focus out event, the selection event will * show it again. To prevent the popup from showing again, we will detect * this case and let the selection event of the arrow button hide the popup. */ Point point = arrow.toControl(getDisplay().getCursorLocation()); Point size = arrow.getSize(); Rectangle rect = new Rectangle(0, 0, size.x, size.y); if (rect.contains(point)) { boolean comboShellActivated = getDisplay ().getActiveShell () == getShell (); if (!comboShellActivated) dropDown (false); break; } dropDown (false); break; } case SWT.MouseUp: { if (event.button != 1) return; dropDown (false); break; } case SWT.Selection: { int index = list.getSelectionIndex (); if (index == -1) return; text.setText (list.getItem (index)); if (text.getEditable() && text.isFocusControl()) text.selectAll (); list.setSelection (index); Event e = new Event (); e.time = event.time; e.stateMask = event.stateMask; e.doit = event.doit; notifyListeners (SWT.Selection, e); event.doit = e.doit; break; } case SWT.Traverse: { switch (event.detail) { case SWT.TRAVERSE_RETURN: case SWT.TRAVERSE_ESCAPE: case SWT.TRAVERSE_ARROW_PREVIOUS: case SWT.TRAVERSE_ARROW_NEXT: event.doit = false; break; case SWT.TRAVERSE_TAB_NEXT: case SWT.TRAVERSE_TAB_PREVIOUS: event.doit = text.traverse(event.detail); event.detail = SWT.TRAVERSE_NONE; if (event.doit) dropDown(false); return; } Event e = new Event (); e.time = event.time; e.detail = event.detail; e.doit = event.doit; e.character = event.character; e.keyCode = event.keyCode; e.keyLocation = event.keyLocation; notifyListeners (SWT.Traverse, e); event.doit = e.doit; event.detail = e.detail; break; } case SWT.KeyUp: { Event e = new Event (); e.time = event.time; e.character = event.character; e.keyCode = event.keyCode; e.keyLocation = event.keyLocation; e.stateMask = event.stateMask; notifyListeners (SWT.KeyUp, e); event.doit = e.doit; break; } case SWT.KeyDown: { if (event.character == SWT.ESC) { // Escape key cancels popup list dropDown (false); } if ((event.stateMask & SWT.ALT) != 0 && (event.keyCode == SWT.ARROW_UP || event.keyCode == SWT.ARROW_DOWN)) { dropDown (false); } if (event.character == SWT.CR) { // Enter causes default selection dropDown (false); Event e = new Event (); e.time = event.time; e.stateMask = event.stateMask; notifyListeners (SWT.DefaultSelection, e); } // At this point the widget may have been disposed. // If so, do not continue. if (isDisposed ()) break; Event e = new Event(); e.time = event.time; e.character = event.character; e.keyCode = event.keyCode; e.keyLocation = event.keyLocation; e.stateMask = event.stateMask; notifyListeners(SWT.KeyDown, e); event.doit = e.doit; break; } } } /** * Pastes text from clipboard. *

* The selected text is deleted from the widget * and new text inserted from the clipboard. *

* * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.3 */ public void paste () { checkWidget (); text.paste (); } void popupEvent(Event event) { switch (event.type) { case SWT.Paint: // draw black rectangle around list Rectangle listRect = list.getBounds(); Color black = getDisplay().getSystemColor(SWT.COLOR_BLACK); event.gc.setForeground(black); event.gc.drawRectangle(0, 0, listRect.width + 1, listRect.height + 1); break; case SWT.Close: event.doit = false; dropDown (false); break; } } @Override public void redraw () { super.redraw(); text.redraw(); arrow.redraw(); if (popup.isVisible()) list.redraw(); } @Override public void redraw (int x, int y, int width, int height, boolean all) { super.redraw(x, y, width, height, true); } /** * Removes the item from the receiver's list at the given * zero-relative index. * * @param index the index for the item * * @exception IllegalArgumentException
    *
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void remove (int index) { checkWidget(); list.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
    *
  • ERROR_INVALID_RANGE - if either the start or end are not between 0 and the number of elements in the list minus 1 (inclusive)
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void remove (int start, int end) { checkWidget(); list.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
    *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
  • ERROR_INVALID_ARGUMENT - if the string is not found in the list
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void remove (String string) { checkWidget(); if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); list.remove (string); } /** * Removes all of the items from the receiver's list and clear the * contents of receiver's text field. * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void removeAll () { checkWidget(); text.setText (""); //$NON-NLS-1$ list.removeAll (); } /** * 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
    *
  • ERROR_NULL_ARGUMENT - if the listener is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see ModifyListener * @see #addModifyListener */ public void removeModifyListener (ModifyListener listener) { checkWidget(); if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); removeTypedListener(SWT.Modify, listener); } /** * Removes the listener from the collection of listeners who will * be notified when the user changes the receiver's selection. * * @param listener the listener which should no longer be notified * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the listener is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see SelectionListener * @see #addSelectionListener */ public void removeSelectionListener (SelectionListener listener) { checkWidget(); if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); removeTypedListener(SWT.Selection, listener); removeTypedListener(SWT.DefaultSelection, listener); } /** * 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
    *
  • ERROR_NULL_ARGUMENT - if the listener is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @see VerifyListener * @see #addVerifyListener * * @since 3.3 */ public void removeVerifyListener (VerifyListener listener) { checkWidget(); if (listener == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); removeTypedListener(SWT.Verify, listener); } /** * 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 index the index of the item to select * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void select (int index) { checkWidget(); if (index == -1) { list.deselectAll (); text.setText (""); //$NON-NLS-1$ return; } if (0 <= index && index < list.getItemCount()) { if (index != getSelectionIndex()) { text.setText (list.getItem (index)); if (text.getEditable() && text.isFocusControl()) text.selectAll (); list.select (index); list.showSelection (); } } } /** * Set the horizontal alignment of the CCombo. * Use the values LEFT, CENTER and RIGHT to align image and text within the available space. * * @param align the alignment style of LEFT, RIGHT or CENTER * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
  • ERROR_INVALID_ARGUMENT - if the value of align is not one of SWT.LEFT, SWT.RIGHT or SWT.CENTER
  • *
* @since 3.113 */ public void setAlignment(int align) { checkWidget(); int styleWithoutAlign = getStyle() & ~(SWT.LEFT | SWT.CENTER | SWT.RIGHT); createText(styleWithoutAlign | align); } @Override public void setBackground (Color color) { super.setBackground(color); background = color; if (text != null) text.setBackground(color); if (list != null) list.setBackground(color); if (arrow != null) arrow.setBackground(color); } /** * Sets the editable state. * * @param editable the new editable state * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.0 */ public void setEditable (boolean editable) { checkWidget (); text.setEditable(editable); } @Override public void setEnabled (boolean enabled) { super.setEnabled(enabled); if (popup != null) popup.setVisible (false); if (text != null) text.setEnabled(enabled); if (arrow != null) arrow.setEnabled(enabled); } @Override public boolean setFocus () { checkWidget(); if (!isEnabled () || !getVisible ()) return false; if (isFocusControl ()) return true; return text.setFocus (); } @Override public void setFont (Font font) { super.setFont (font); this.font = font; text.setFont (font); list.setFont (font); internalLayout (true); } @Override public void setForeground (Color color) { super.setForeground(color); foreground = color; if (text != null) text.setForeground(color); if (list != null) list.setForeground(color); if (arrow != null) arrow.setForeground(color); } /** * 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 remove'ing the old item at the index, and then * add'ing the new item at that index. * * @param index the index for the item * @param string the new text for the item * * @exception IllegalArgumentException
    *
  • ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)
  • *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setItem (int index, String string) { checkWidget(); list.setItem (index, string); } /** * Sets the receiver's list to be the given array of items. * * @param items the array of items * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the items array is null
  • *
  • ERROR_INVALID_ARGUMENT - if an item in the items array is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setItems (String [] items) { checkWidget (); list.setItems (items); if (!text.getEditable ()) text.setText (""); //$NON-NLS-1$ } /** * Sets the layout which is associated with the receiver to be * the argument which may be null. *

* Note: No Layout can be set on this Control because it already * manages the size and position of its children. *

* * @param layout the receiver's new layout or null * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ @Override public void setLayout (Layout layout) { checkWidget (); return; } /** * Marks the receiver's list as visible if the argument is true, * and marks it invisible otherwise. *

* 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. *

* * @param visible the new visibility state * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.4 */ public void setListVisible (boolean visible) { checkWidget (); dropDown(visible); } @Override public void setMenu(Menu menu) { text.setMenu(menu); } /** * 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
    *
  • ERROR_NULL_ARGUMENT - if the point is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setSelection (Point selection) { checkWidget(); if (selection == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); text.setSelection (selection.x, selection.y); } /** * Sets the contents of the receiver's text field to the * given string. *

* Note: The text field in a Combo 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. *

* Also note, if control characters like '\n', '\t' etc. are used * in the string, then the behavior is platform dependent. *

* * @param string the new text * * @exception IllegalArgumentException
    *
  • ERROR_NULL_ARGUMENT - if the string is null
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setText (String string) { checkWidget(); if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT); int index = list.indexOf (string); if (index == -1) { list.deselectAll (); text.setText (string); return; } text.setText (string); if (text.getEditable() && text.isFocusControl()) text.selectAll (); list.setSelection (index); list.showSelection (); } /** * Sets the maximum number of characters that the receiver's * text field is capable of holding to be the argument. * * @param limit new text limit * * @exception IllegalArgumentException
    *
  • ERROR_CANNOT_BE_ZERO - if the limit is zero
  • *
* @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
*/ public void setTextLimit (int limit) { checkWidget(); text.setTextLimit (limit); } @Override public void setToolTipText (String string) { checkWidget(); super.setToolTipText(string); arrow.setToolTipText (string); text.setToolTipText (string); } @Override public void setVisible (boolean visible) { super.setVisible(visible); /* * At this point the widget may have been disposed in a FocusOut event. * If so then do not continue. */ if (isDisposed ()) return; // TEMPORARY CODE if (popup == null || popup.isDisposed ()) return; if (!visible) popup.setVisible (false); } /** * Sets the number of items that are visible in the drop * down portion of the receiver's list. * * @param count the new number of items to be visible * * @exception SWTException
    *
  • ERROR_WIDGET_DISPOSED - if the receiver has been disposed
  • *
  • ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver
  • *
* * @since 3.0 */ public void setVisibleItemCount (int count) { checkWidget (); if (count < 0) return; visibleItemCount = count; } String stripMnemonic (String string) { int index = 0; int length = string.length (); do { while ((index < length) && (string.charAt (index) != '&')) index++; if (++index >= length) return string; if (string.charAt (index) != '&') { return string.substring(0, index-1) + string.substring(index, length); } index++; } while (index < length); return string; } void textEvent (Event event) { switch (event.type) { case SWT.FocusIn: { handleFocus (SWT.FocusIn); break; } case SWT.DefaultSelection: { dropDown (false); Event e = new Event (); e.time = event.time; e.stateMask = event.stateMask; notifyListeners (SWT.DefaultSelection, e); break; } case SWT.DragDetect: case SWT.MouseDoubleClick: case SWT.MouseMove: case SWT.MouseEnter: case SWT.MouseExit: case SWT.MouseHover: { Point pt = getDisplay ().map (text, this, event.x, event.y); event.x = pt.x; event.y = pt.y; notifyListeners (event.type, event); event.type = SWT.None; break; } case SWT.KeyDown: { Event keyEvent = new Event (); keyEvent.time = event.time; keyEvent.character = event.character; keyEvent.keyCode = event.keyCode; keyEvent.keyLocation = event.keyLocation; keyEvent.stateMask = event.stateMask; notifyListeners (SWT.KeyDown, keyEvent); if (isDisposed ()) break; event.doit = keyEvent.doit; if (!event.doit) break; if (event.keyCode == SWT.ARROW_UP || event.keyCode == SWT.ARROW_DOWN) { event.doit = false; if ((event.stateMask & SWT.ALT) != 0) { boolean dropped = isDropped (); if (text.getEditable() && text.isFocusControl()) text.selectAll (); if (!dropped) setFocus (); dropDown (!dropped); break; } int oldIndex = getSelectionIndex (); if (event.keyCode == SWT.ARROW_UP) { select (Math.max (oldIndex - 1, 0)); } else { select (Math.min (oldIndex + 1, getItemCount () - 1)); } if (oldIndex != getSelectionIndex ()) { Event e = new Event(); e.time = event.time; e.stateMask = event.stateMask; notifyListeners (SWT.Selection, e); } if (isDisposed ()) break; } // Further work : Need to add support for incremental search in // pop up list as characters typed in text widget break; } case SWT.KeyUp: { Event e = new Event (); e.time = event.time; e.character = event.character; e.keyCode = event.keyCode; e.keyLocation = event.keyLocation; e.stateMask = event.stateMask; notifyListeners (SWT.KeyUp, e); event.doit = e.doit; break; } case SWT.MenuDetect: { Event e = new Event (); e.time = event.time; e.detail = event.detail; e.x = event.x; e.y = event.y; if (event.detail == SWT.MENU_KEYBOARD) { Point pt = getDisplay().map(text, null, text.getCaretLocation()); e.x = pt.x; e.y = pt.y; } notifyListeners (SWT.MenuDetect, e); event.doit = e.doit; event.x = e.x; event.y = e.y; break; } case SWT.Modify: { list.deselectAll (); Event e = new Event (); e.time = event.time; notifyListeners (SWT.Modify, e); break; } case SWT.MouseDown: { Point pt = getDisplay ().map (text, this, event.x, event.y); Event mouseEvent = new Event (); mouseEvent.button = event.button; mouseEvent.count = event.count; mouseEvent.stateMask = event.stateMask; mouseEvent.time = event.time; mouseEvent.x = pt.x; mouseEvent.y = pt.y; notifyListeners (SWT.MouseDown, mouseEvent); if (isDisposed ()) break; event.doit = mouseEvent.doit; if (!event.doit) break; if (event.button != 1) return; if (text.getEditable ()) return; boolean dropped = isDropped (); if (text.getEditable() && text.isFocusControl()) text.selectAll (); if (!dropped) setFocus (); dropDown (!dropped); break; } case SWT.MouseUp: { Point pt = getDisplay ().map (text, this, event.x, event.y); Event mouseEvent = new Event (); mouseEvent.button = event.button; mouseEvent.count = event.count; mouseEvent.stateMask = event.stateMask; mouseEvent.time = event.time; mouseEvent.x = pt.x; mouseEvent.y = pt.y; notifyListeners (SWT.MouseUp, mouseEvent); if (isDisposed ()) break; event.doit = mouseEvent.doit; if (!event.doit) break; if (event.button != 1) return; if (text.getEditable ()) return; if (text.getEditable() && text.isFocusControl()) text.selectAll (); break; } case SWT.MouseWheel: { notifyListeners (SWT.MouseWheel, event); event.type = SWT.None; if (isDisposed ()) break; if (!event.doit) break; if (event.count != 0) { event.doit = false; int oldIndex = getSelectionIndex (); if (event.count > 0) { select (Math.max (oldIndex - 1, 0)); } else { select (Math.min (oldIndex + 1, getItemCount () - 1)); } if (oldIndex != getSelectionIndex ()) { Event e = new Event(); e.time = event.time; e.stateMask = event.stateMask; notifyListeners (SWT.Selection, e); } if (isDisposed ()) break; } break; } case SWT.Traverse: { switch (event.detail) { case SWT.TRAVERSE_ARROW_PREVIOUS: case SWT.TRAVERSE_ARROW_NEXT: // The enter causes default selection and // the arrow keys are used to manipulate the list contents so // do not use them for traversal. event.doit = false; break; case SWT.TRAVERSE_TAB_PREVIOUS: event.doit = traverse(SWT.TRAVERSE_TAB_PREVIOUS); event.detail = SWT.TRAVERSE_NONE; return; } Event e = new Event (); e.time = event.time; e.detail = event.detail; e.doit = event.doit; e.character = event.character; e.keyCode = event.keyCode; e.keyLocation = event.keyLocation; notifyListeners (SWT.Traverse, e); event.doit = e.doit; event.detail = e.detail; break; } case SWT.Verify: { Event e = new Event (); e.text = event.text; e.start = event.start; e.end = event.end; e.character = event.character; e.keyCode = event.keyCode; e.keyLocation = event.keyLocation; e.stateMask = event.stateMask; notifyListeners (SWT.Verify, e); event.text = e.text; event.doit = e.doit; break; } } } @Override public boolean traverse(int event){ /* * When the traverse event is sent to the CCombo, it will create a list of * controls to tab to next. Since the CCombo is a composite, the next control is * the Text field which is a child of the CCombo. It will set focus to the text * field which really is itself. So, call the traverse next events directly on the text. */ if (event == SWT.TRAVERSE_ARROW_NEXT || event == SWT.TRAVERSE_TAB_NEXT) { return text.traverse(event); } return super.traverse(event); } /** * The method accepts a combo and a callback which takes * all the child of the CCombo as the argument and executes it. * All children are refreshed after the execution of the callback. * * @noreference This method is not intended to be referenced by clients. * @param combo the Combo to get the children widget from * @param childUpdater the callback which works with the child widgets */ public static void updateAndRefreshChildren(CCombo combo, Consumer childUpdater) { childUpdater.accept(combo.text); childUpdater.accept(combo.list); childUpdater.accept(combo.arrow); childUpdater.accept(combo.popup); } }




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