| package org.eclipse.swt.widgets; |
| |
| /* |
| * (c) Copyright IBM Corp. 2000, 2001. |
| * All Rights Reserved |
| */ |
| |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.internal.*; |
| import org.eclipse.swt.internal.gtk.*; |
| import org.eclipse.swt.graphics.*; |
| |
| /** |
| * 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. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>SEPARATOR, HORIZONTAL, SHADOW_IN, SHADOW_OUT, VERTICAL</dd> |
| * <dd>CENTER, LEFT, RIGHT, WRAP</dd> |
| * <dt><b>Events:</b></dt> |
| * <dd>(none)</dd> |
| * </dl> |
| * <p> |
| * IMPORTANT: This class is intended to be subclassed <em>only</em> |
| * within the SWT implementation. |
| * </p> |
| */ |
| |
| public class Label extends Control { |
| int boxHandle, frameHandle; |
| Image image; |
| String text; |
| |
| /** |
| * Constructs a new instance of this class given its parent |
| * and a style value describing its behavior and appearance. |
| * <p> |
| * The style value is either one of the style constants defined in |
| * class <code>SWT</code> which is applicable to instances of this |
| * class, or must be built by <em>bitwise OR</em>'ing together |
| * (that is, using the <code>int</code> "|" operator) two or more |
| * of those <code>SWT</code> style constants. The class description |
| * for all SWT widget classes should include a comment which |
| * describes the style constants which are applicable to the class. |
| * </p> |
| * |
| * @param parent a composite control which will be the parent of the new instance (cannot be null) |
| * @param style the style of control to construct |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
| * </ul> |
| * @exception SWTException <ul> |
| * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
| * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
| * </ul> |
| * |
| * @see SWT |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Label (Composite parent, int style) { |
| super (parent, checkStyle (style)); |
| } |
| |
| static int checkStyle (int style) { |
| if ((style & SWT.SEPARATOR) != 0) return style; |
| return checkBits (style, SWT.LEFT, SWT.CENTER, SWT.RIGHT, 0, 0, 0); |
| } |
| |
| void createHandle (int index) { |
| state |= HANDLE; |
| |
| boxHandle = OS.gtk_event_box_new (); |
| if (boxHandle == 0) error (SWT.ERROR_NO_HANDLES); |
| |
| frameHandle = OS.gtk_frame_new(null); |
| if (frameHandle == 0) error (SWT.ERROR_NO_HANDLES); |
| |
| handle = ((style&SWT.SEPARATOR) != 0)? (((style&SWT.HORIZONTAL)!= 0)? |
| OS.gtk_hseparator_new() : OS.gtk_vseparator_new()): |
| OS.gtk_label_new (new byte [1]); |
| if (handle == 0) error (SWT.ERROR_NO_HANDLES); |
| } |
| |
| void createWidget (int index) { |
| super.createWidget (index); |
| text = ""; |
| } |
| |
| void setHandleStyle () { |
| int type = (style & SWT.BORDER) != 0 ? OS.GTK_SHADOW_ETCHED_IN : OS.GTK_SHADOW_NONE; |
| OS.gtk_frame_set_shadow_type (frameHandle, type); |
| if ((style & SWT.SEPARATOR) != 0) return; |
| if ((style & SWT.WRAP) != 0) OS.gtk_label_set_line_wrap (handle, true); |
| if ((style & SWT.LEFT) != 0) { |
| OS.gtk_misc_set_alignment (handle, 0.0f, 0.0f); |
| OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_LEFT); |
| return; |
| } |
| if ((style & SWT.CENTER) != 0) { |
| OS.gtk_misc_set_alignment (handle, 0.5f, 0.0f); |
| OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_CENTER); |
| return; |
| } |
| if ((style & SWT.RIGHT) != 0) { |
| OS.gtk_misc_set_alignment (handle, 1.0f, 0.0f); |
| OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_RIGHT); |
| return; |
| } |
| } |
| |
| void configure() { |
| _connectParent(); |
| OS.gtk_container_add(boxHandle, frameHandle); |
| OS.gtk_container_add(frameHandle, handle); |
| } |
| |
| void showHandle() { |
| OS.gtk_widget_show (boxHandle); |
| OS.gtk_widget_show (frameHandle); |
| OS.gtk_widget_show (handle); |
| OS.gtk_widget_realize (handle); |
| } |
| |
| void register () { |
| super.register (); |
| WidgetTable.put (boxHandle, this); |
| WidgetTable.put (frameHandle, this); |
| } |
| |
| void deregister () { |
| super.deregister (); |
| WidgetTable.remove (boxHandle); |
| WidgetTable.remove (frameHandle); |
| } |
| |
| int eventHandle () { |
| return boxHandle; |
| } |
| |
| void releaseWidget () { |
| super.releaseWidget (); |
| image = null; |
| text = null; |
| } |
| |
| void releaseHandle () { |
| super.releaseHandle (); |
| boxHandle = frameHandle = 0; |
| } |
| |
| int topHandle () { |
| return boxHandle; |
| } |
| |
| int computeHandle () { |
| return frameHandle; |
| } |
| |
| public Point computeSize (int wHint, int hHint, boolean changed) { |
| checkWidget (); |
| if ((style&SWT.SEPARATOR) != 0) { |
| int w, h; |
| if ((style&SWT.HORIZONTAL)!= 0) { |
| w = 45; |
| h = 6; |
| } else { // vertical |
| w = 6; |
| h = 45; |
| } |
| if (wHint != SWT.DEFAULT) w = wHint; |
| if (hHint != SWT.DEFAULT) h = hHint; |
| return new Point(w,h); |
| } |
| return super.computeSize(wHint, hHint, changed); |
| } |
| |
| /** |
| * 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; |
| } |
| |
| /** |
| * 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); |
| boolean isText = OS.GTK_WIDGET_TYPE (handle) == OS.gtk_label_get_type (); |
| if ((style & SWT.LEFT) != 0) { |
| OS.gtk_misc_set_alignment (handle, 0.0f, 0.0f); |
| if (isText) OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_LEFT); |
| return; |
| } |
| if ((style & SWT.CENTER) != 0) { |
| OS.gtk_misc_set_alignment (handle, 0.5f, 0.0f); |
| if (isText) OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_CENTER); |
| return; |
| } |
| if ((style & SWT.RIGHT) != 0) { |
| OS.gtk_misc_set_alignment (handle, 1.0f, 0.0f); |
| if (isText) OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_RIGHT); |
| return; |
| } |
| } |
| |
| /** |
| * 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 (); |
| this.image = image; |
| if ((style & SWT.SEPARATOR) != 0) return; |
| //NOT IMPLEMENTED - events and state of handle lost |
| WidgetTable.remove (handle); |
| OS.gtk_widget_destroy (handle); |
| if (image == null) { |
| handle = OS.gtk_label_new (new byte [1]); |
| } else { |
| handle = OS.gtk_pixmap_new (image.pixmap, image.mask); |
| } |
| OS.gtk_container_add (frameHandle, handle); |
| WidgetTable.put (handle, this); |
| int alignment = style & (SWT.LEFT | SWT.RIGHT | SWT.CENTER); |
| switch (alignment) { |
| case SWT.LEFT: OS.gtk_misc_set_alignment (handle, 0.0f, 0.0f); break; |
| case SWT.CENTER: OS.gtk_misc_set_alignment (handle, 0.5f, 0.0f); break; |
| case SWT.RIGHT: OS.gtk_misc_set_alignment (handle, 1.0f, 0.0f); break; |
| } |
| OS.gtk_widget_show (handle); |
| } |
| |
| /** |
| * Sets the receiver's text. |
| * <p> |
| * This method sets the widget label. The label may include |
| * the mnemonic characters and line delimiters. |
| * </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; |
| text = string; |
| boolean isText = OS.GTK_WIDGET_TYPE (handle) == OS.gtk_label_get_type (); |
| if (!isText) { |
| //NOT IMPLEMENTED - events and state of handle lost |
| WidgetTable.remove (handle); |
| OS.gtk_widget_destroy (handle); |
| handle = OS.gtk_label_new (new byte [1]); |
| OS.gtk_container_add (frameHandle, handle); |
| WidgetTable.put (handle, this); |
| int alignment = style & (SWT.LEFT | SWT.RIGHT | SWT.CENTER); |
| switch (alignment) { |
| case SWT.LEFT: |
| OS.gtk_misc_set_alignment (handle, 0.0f, 0.0f); |
| OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_LEFT); |
| break; |
| case SWT.CENTER: |
| OS.gtk_misc_set_alignment (handle, 0.5f, 0.0f); |
| OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_CENTER); |
| break; |
| case SWT.RIGHT: |
| OS.gtk_misc_set_alignment (handle, 1.0f, 0.0f); |
| OS.gtk_label_set_justify (handle, OS.GTK_JUSTIFY_RIGHT); |
| break; |
| } |
| } |
| OS.gtk_label_parse_uline (handle, string2bytesConvertMnemonic(string)); |
| } |
| |
| } |