| /******************************************************************************* |
| * 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.motif.*; |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.graphics.*; |
| |
| /** |
| * Instances of this class provide an i-beam that is typically used |
| * as the insertion point for text. |
| * <dl> |
| * <dt><b>Styles:</b></dt> |
| * <dd>(none)</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> |
| * |
| * @see <a href="http://www.eclipse.org/swt/snippets/#caret">Caret snippets</a> |
| * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample, Canvas tab</a> |
| * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
| */ |
| public class Caret extends Widget { |
| Canvas parent; |
| int x, y, width, height; |
| boolean isVisible, isShowing; |
| int blinkRate; |
| Image image; |
| Font font; |
| /** |
| * 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 |
| * @see Widget#checkSubclass |
| * @see Widget#getStyle |
| */ |
| public Caret (Canvas parent, int style) { |
| super (parent, style); |
| this.parent = parent; |
| createWidget (0); |
| } |
| boolean blinkCaret () { |
| if (!isVisible) return true; |
| if (!isShowing) return showCaret (); |
| if (blinkRate == 0) return true; |
| return hideCaret (); |
| } |
| void createWidget (int index) { |
| super.createWidget (index); |
| blinkRate = display.getCaretBlinkTime (); |
| isVisible = true; |
| if (parent.getCaret () == null) { |
| parent.setCaret (this); |
| } |
| } |
| boolean drawCaret () { |
| if (parent == null) return false; |
| if (parent.isDisposed ()) return false; |
| int handle = parent.handle; |
| int window = OS.XtWindow (handle); |
| if (window == 0) return false; |
| int xDisplay = OS.XtDisplay (handle); |
| int gc = OS.XCreateGC (xDisplay, window, 0, null); |
| int color; |
| if (OS.IsSunOS) { |
| int foreground = parent.getForegroundPixel (); |
| Control control = parent.findBackgroundControl (); |
| if (control == null) control = parent; |
| int background = control.getBackgroundPixel (); |
| color = foreground ^ background; |
| } else { |
| int screenNum = OS.XDefaultScreen (xDisplay); |
| color = OS.XWhitePixel(xDisplay, screenNum); |
| } |
| OS.XSetForeground (xDisplay, gc, color); |
| OS.XSetFunction (xDisplay, gc, OS.GXxor); |
| if (image != null && !image.isDisposed() && image.mask == 0) { |
| int [] unused = new int [1]; int [] width = new int [1]; int [] height = new int [1]; |
| OS.XGetGeometry (xDisplay, image.pixmap, unused, unused, unused, width, height, unused, unused); |
| OS.XCopyArea(xDisplay, image.pixmap, window, gc, 0, 0, width[0], height[0], x, y); |
| } else { |
| int nWidth = width, nHeight = height; |
| if (nWidth <= 0) nWidth = 1; |
| OS.XFillRectangle (xDisplay, window, gc, x, y, nWidth, nHeight); |
| } |
| OS.XFreeGC (xDisplay, gc); |
| return true; |
| } |
| /** |
| * Returns a rectangle describing the receiver's size and location |
| * relative to its parent (or its display if its parent is null). |
| * |
| * @return the receiver's bounding rectangle |
| * |
| * @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 Rectangle getBounds () { |
| checkWidget(); |
| if (image != null) { |
| Rectangle rect = image.getBounds (); |
| return new Rectangle (x, y, rect.width, rect.height); |
| } |
| return new Rectangle (x, y, width, height); |
| } |
| /** |
| * Returns the font that the receiver will use to paint textual information. |
| * |
| * @return the receiver's font |
| * |
| * @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 Font getFont () { |
| checkWidget(); |
| if (font != null) return font; |
| return parent.getFont (); |
| } |
| /** |
| * Returns the image that the receiver will use to paint the caret. |
| * |
| * @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; |
| } |
| /** |
| * Returns a point describing the receiver's location relative |
| * to its parent (or its display if its parent is null). |
| * |
| * @return the receiver's location |
| * |
| * @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 Point getLocation () { |
| checkWidget(); |
| return new Point (x, y); |
| } |
| /** |
| * Returns the receiver's parent, which must be a <code>Canvas</code>. |
| * |
| * @return the receiver's parent |
| * |
| * @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 Canvas getParent () { |
| checkWidget(); |
| return parent; |
| } |
| /** |
| * Returns a point describing the receiver's size. |
| * |
| * @return the receiver's size |
| * |
| * @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 Point getSize () { |
| checkWidget(); |
| if (image != null) { |
| Rectangle rect = image.getBounds (); |
| return new Point (rect.width, rect.height); |
| } |
| return new Point (width, height); |
| } |
| /** |
| * Returns <code>true</code> if the receiver 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 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> |
| */ |
| public boolean getVisible () { |
| checkWidget(); |
| return isVisible; |
| } |
| boolean hideCaret () { |
| if (!isShowing) return true; |
| isShowing = false; |
| return drawCaret (); |
| } |
| /** |
| * Returns <code>true</code> if the receiver is visible and all |
| * of the receiver's ancestors are visible and <code>false</code> |
| * otherwise. |
| * |
| * @return the receiver'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> |
| * |
| * @see #getVisible |
| */ |
| public boolean isVisible () { |
| checkWidget(); |
| return isVisible && parent.isVisible () && parent.hasFocus (); |
| } |
| boolean isFocusCaret () { |
| return this == display.currentCaret; |
| } |
| void killFocus () { |
| if (display.currentCaret != this) return; |
| display.setCurrentCaret (null); |
| if (isVisible) hideCaret (); |
| } |
| void releaseParent () { |
| super.releaseParent (); |
| if (this == parent.getCaret ()) parent.setCaret (null); |
| } |
| void releaseWidget () { |
| super.releaseWidget (); |
| if (display.currentCaret == this) { |
| hideCaret (); |
| display.setCurrentCaret (null); |
| } |
| parent = null; |
| image = null; |
| } |
| /** |
| * Sets the receiver's size and location to the rectangular |
| * area specified by the arguments. The <code>x</code> and |
| * <code>y</code> arguments are relative to the receiver's |
| * parent (or its display if its parent is null). |
| * |
| * @param x the new x coordinate for the receiver |
| * @param y the new y coordinate for the receiver |
| * @param width the new width for the receiver |
| * @param height the new height for the receiver |
| * |
| * @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 setBounds (int x, int y, int width, int height) { |
| checkWidget(); |
| if (this.x == x && this.y == y && this.width == width && this.height == height) return; |
| boolean isFocus = isFocusCaret (); |
| if (isFocus && isVisible) hideCaret (); |
| this.x = x; this.y = y; |
| this.width = width; this.height = height; |
| if (isVisible) parent.updateIM (); |
| if (isFocus && isVisible) showCaret (); |
| } |
| /** |
| * Sets the receiver's size and location to the rectangular |
| * area specified by the argument. The <code>x</code> and |
| * <code>y</code> fields of the rectangle are relative to |
| * the receiver's parent (or its display if its parent is null). |
| * |
| * @param rect the new bounds for the receiver |
| * |
| * @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 setBounds (Rectangle rect) { |
| checkWidget(); |
| if (rect == null) error (SWT.ERROR_NULL_ARGUMENT); |
| setBounds (rect.x, rect.y, rect.width, rect.height); |
| } |
| void setFocus () { |
| if (display.currentCaret == this) return; |
| display.setCurrentCaret (this); |
| if (isVisible) showCaret (); |
| } |
| /** |
| * Sets the font that the receiver will use to paint textual information |
| * to the font specified by the argument, or to the default font for that |
| * kind of control if the argument is null. |
| * |
| * @param font the new font (or null) |
| * |
| * @exception IllegalArgumentException <ul> |
| * <li>ERROR_INVALID_ARGUMENT - if the font 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 setFont (Font font) { |
| checkWidget(); |
| if (font != null && font.isDisposed ()) { |
| error (SWT.ERROR_INVALID_ARGUMENT); |
| } |
| this.font = font; |
| if (isVisible) parent.updateIM (); |
| } |
| /** |
| * Sets the image that the receiver will use to paint the caret |
| * to the image specified by the argument, or to the default |
| * which is a filled rectangle if the argument is null |
| * |
| * @param image the new image (or 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 (image != null && image.isDisposed ()) { |
| error (SWT.ERROR_INVALID_ARGUMENT); |
| } |
| boolean isFocus = isFocusCaret (); |
| if (isFocus && isVisible) hideCaret (); |
| this.image = image; |
| if (isFocus && isVisible) showCaret (); |
| } |
| /** |
| * Sets the receiver's location to the point specified by |
| * the arguments which are relative to the receiver's |
| * parent (or its display if its parent is null). |
| * |
| * @param x the new x coordinate for the receiver |
| * @param y the new y coordinate for the receiver |
| * |
| * @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 setLocation (int x, int y) { |
| checkWidget(); |
| setBounds (x, y, width, height); |
| } |
| /** |
| * Sets the receiver's location to the point specified by |
| * the argument which is relative to the receiver's |
| * parent (or its display if its parent is null). |
| * |
| * @param location the new location for the receiver |
| * |
| * @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 setLocation (Point location) { |
| checkWidget(); |
| if (location == null) error (SWT.ERROR_NULL_ARGUMENT); |
| setLocation (location.x, location.y); |
| } |
| /** |
| * Sets the receiver's size to the point specified by the arguments. |
| * |
| * @param width the new width for the receiver |
| * @param height the new height for the receiver |
| * |
| * @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 setSize (int width, int height) { |
| checkWidget(); |
| setBounds (x, y, width, height); |
| } |
| /** |
| * Sets the receiver's size to the point specified by the argument. |
| * |
| * @param size the new extent for the receiver |
| * |
| * @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> |
| */ |
| public void setSize (Point size) { |
| checkWidget(); |
| if (size == null) error (SWT.ERROR_NULL_ARGUMENT); |
| setSize (size.x, size.y); |
| } |
| /** |
| * Marks the receiver 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> |
| */ |
| public void setVisible (boolean visible) { |
| checkWidget(); |
| if (visible == isVisible) return; |
| isVisible = visible; |
| if (!isFocusCaret ()) return; |
| if (isVisible) { |
| showCaret (); |
| } else { |
| hideCaret (); |
| } |
| } |
| boolean showCaret () { |
| if (isShowing) return true; |
| isShowing = true; |
| return drawCaret (); |
| } |
| } |