| /******************************************************************************* |
| * Copyright (c) 2000, 2008 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.widgets; |
| |
| |
| import org.eclipse.swt.internal.wpf.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| |
| /** |
| * Instances of this class represent a non-selectable |
| * user interface object that displays a string or image. |
| * When SEPARATOR is specified, displays a single |
| * vertical or horizontal line. |
| * <p> |
| * Shadow styles are hints and may not be honored |
| * by the platform. To create a separator label |
| * with the default shadow style for the platform, |
| * do not specify a shadow style. |
| * </p> |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>SEPARATOR, HORIZONTAL, VERTICAL</dd> |
| * <dd>SHADOW_IN, SHADOW_OUT, SHADOW_NONE</dd> |
| * <dd>CENTER, LEFT, RIGHT, WRAP</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>(none)</dd> |
| * </dl> |
| * <p> |
| * Note: Only one of SHADOW_IN, SHADOW_OUT and SHADOW_NONE may be specified. |
| * SHADOW_NONE is a HINT. Only one of HORIZONTAL and VERTICAL may be specified. |
| * Only one of CENTER, LEFT and RIGHT may be specified. |
| * </p><p> |
| * IMPORTANT: This class is intended to be subclassed <em>only</em> |
| * within the SWT implementation. |
| * </p> |
| * |
| * @see <a href="http://www.eclipse.org/swt/snippets/#label">Label snippets</a> |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| * @noextend This class is not intended to be subclassed by clients. |
| */ |
| public class Label extends Control { |
| String text = ""; |
| Image image; |
| |
| /** |
| * 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#SEPARATOR |
| * @see SWT#HORIZONTAL |
| * @see SWT#VERTICAL |
| * @see SWT#SHADOW_IN |
| * @see SWT#SHADOW_OUT |
| * @see SWT#SHADOW_NONE |
| * @see SWT#CENTER |
| * @see SWT#LEFT |
| * @see SWT#RIGHT |
| * @see SWT#WRAP |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Label (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| } |
| |
| static int checkStyle (int style) { |
| style |= SWT.NO_FOCUS; |
| if ((style & SWT.SEPARATOR) != 0) { |
| style = checkBits (style, SWT.VERTICAL, SWT.HORIZONTAL, 0, 0, 0, 0); |
| return checkBits (style, SWT.SHADOW_OUT, SWT.SHADOW_IN, SWT.SHADOW_NONE, 0, 0, 0); |
| } |
| return checkBits (style, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0); |
| } |
| |
| void createHandle () { |
| state |= THEME_BACKGROUND; |
| if ((style & SWT.SEPARATOR) != 0) { |
| handle = OS.gcnew_UserControl (); |
| if (handle == 0) error (SWT.ERROR_NO_HANDLES); |
| int separator = OS.gcnew_Label (); |
| if (separator == 0) error (SWT.ERROR_NO_HANDLES); |
| OS.ContentControl_Content (handle, separator); |
| if ((style & SWT.VERTICAL) != 0) { |
| OS.FrameworkElement_Width (separator, OS.SystemParameters_ThinVerticalBorderWidth ()); |
| OS.Control_HorizontalContentAlignment (handle, OS.HorizontalAlignment_Center); |
| OS.Control_VerticalContentAlignment (handle, OS.VerticalAlignment_Stretch); |
| } else { |
| OS.FrameworkElement_Height (separator, OS.SystemParameters_ThinHorizontalBorderHeight ()); |
| OS.Control_HorizontalContentAlignment (handle, OS.HorizontalAlignment_Stretch); |
| OS.Control_VerticalContentAlignment (handle, OS.VerticalAlignment_Center); |
| } |
| int brush = OS.SystemColors_ActiveBorderBrush (); |
| OS.Control_Background (separator, brush); |
| OS.GCHandle_Free (brush); |
| OS.GCHandle_Free (separator); |
| } else { |
| handle = OS.gcnew_Label (); |
| if (handle == 0) error (SWT.ERROR_NO_HANDLES); |
| int value = OS.HorizontalAlignment_Left; |
| if ((style & SWT.CENTER) != 0) value = OS.HorizontalAlignment_Center; |
| if ((style & SWT.RIGHT) != 0) value = OS.HorizontalAlignment_Right; |
| OS.Control_HorizontalContentAlignment (handle, value); |
| int margin = OS.gcnew_Thickness (0, 0, 0, 0); |
| OS.Control_Padding (handle, margin); |
| OS.GCHandle_Free (margin); |
| } |
| } |
| |
| int defaultBackground () { |
| //TEMPORARY CODE |
| // return OS.SystemColors_ControlColor; |
| return 0; |
| } |
| |
| /** |
| * Returns a value which describes the position of the |
| * text or image in the receiver. The value will be one of |
| * <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code> |
| * unless the receiver is a <code>SEPARATOR</code> label, in |
| * which case, <code>NONE</code> is returned. |
| * |
| * @return the alignment |
| * |
| * @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 getAlignment () { |
| checkWidget (); |
| if ((style & SWT.SEPARATOR) != 0) return 0; |
| if ((style & SWT.LEFT) != 0) return SWT.LEFT; |
| if ((style & SWT.CENTER) != 0) return SWT.CENTER; |
| if ((style & SWT.RIGHT) != 0) return SWT.RIGHT; |
| return SWT.LEFT; |
| } |
| |
| /** |
| * Returns the receiver's image if it has one, or null |
| * if it does not. |
| * |
| * @return the receiver's image |
| * |
| * @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 Image getImage () { |
| checkWidget (); |
| return image; |
| } |
| |
| String getNameText () { |
| return getText (); |
| } |
| |
| /** |
| * Returns the receiver's text, which will be an empty |
| * string if it has never been set or if the receiver is |
| * a <code>SEPARATOR</code> label. |
| * |
| * @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 (); |
| if ((style & SWT.SEPARATOR) != 0) return ""; |
| return text; |
| } |
| |
| boolean mnemonicHit (char key) { |
| //TODO |
| return false; |
| } |
| |
| boolean mnemonicMatch (char key) { |
| int accessText = OS.ContentControl_Content (handle); |
| boolean result = super.mnemonicMatch (accessText, key); |
| OS.GCHandle_Free (accessText); |
| return result; |
| } |
| |
| void releaseWidget () { |
| super.releaseWidget (); |
| text = null; |
| image = null; |
| } |
| |
| /** |
| * Controls how text and images will be displayed in the receiver. |
| * The argument should be one of <code>LEFT</code>, <code>RIGHT</code> |
| * or <code>CENTER</code>. If the receiver is a <code>SEPARATOR</code> |
| * label, the argument is ignored and the alignment is not changed. |
| * |
| * @param alignment the new alignment |
| * |
| * @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 setAlignment (int alignment) { |
| checkWidget (); |
| if ((style & SWT.SEPARATOR) != 0) return; |
| if ((alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER)) == 0) return; |
| style &= ~(SWT.LEFT | SWT.RIGHT | SWT.CENTER); |
| style |= alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER); |
| int value = OS.HorizontalAlignment_Left; |
| if ((style & SWT.CENTER) != 0) value = OS.HorizontalAlignment_Center; |
| if ((style & SWT.RIGHT) != 0) value = OS.HorizontalAlignment_Right; |
| OS.Control_HorizontalContentAlignment (handle, value); |
| } |
| |
| /** |
| * Sets the receiver's image to the argument, which may be |
| * null indicating that no image should be displayed. |
| * |
| * @param image the image to display on the receiver (may be null) |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</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 setImage (Image image) { |
| checkWidget (); |
| if ((style & SWT.SEPARATOR) != 0) return; |
| if (image != null && image.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT); |
| this.image = image; |
| int imageHandle = OS.gcnew_Image (); |
| OS.Image_Stretch (imageHandle, OS.Stretch_None); |
| OS.Image_Source (imageHandle, image != null ? image.handle : 0); |
| OS.ContentControl_Content (handle, imageHandle); |
| OS.GCHandle_Free (imageHandle); |
| } |
| |
| /** |
| * Sets the receiver's text. |
| * <p> |
| * This method sets the widget label. The label may include |
| * the mnemonic character and line delimiters. |
| * </p> |
| * <p> |
| * Mnemonics are indicated by an '&' that causes the next |
| * character to be the mnemonic. When the user presses a |
| * key sequence that matches the mnemonic, focus is assigned |
| * to the control that follows the label. On most platforms, |
| * the mnemonic appears underlined but may be emphasised in a |
| * platform specific manner. The mnemonic indicator character |
| * '&' can be escaped by doubling it in the string, causing |
| * a single '&' to be displayed. |
| * </p> |
| * |
| * @param string the new text |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the text 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.SEPARATOR) != 0) return; |
| if (string.equals (text)) return; |
| text = string; |
| int ptr = createDotNetString (text, true); |
| int accessText = OS.gcnew_AccessText (); |
| if (accessText == 0) error (SWT.ERROR_NO_HANDLES); |
| if ((style & SWT.WRAP) != 0) { |
| OS.AccessText_TextWrapping (accessText, OS.TextWrapping_WrapWithOverflow); |
| } |
| OS.AccessText_Text (accessText, ptr); |
| OS.ContentControl_Content (handle, accessText); |
| OS.GCHandle_Free (ptr); |
| OS.GCHandle_Free (accessText); |
| } |
| |
| } |