| 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 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> |
| */ |
| |
| public class Caret extends Widget { |
| Canvas parent; |
| int x, y, width, height; |
| boolean moved, resized; |
| boolean isVisible,isShowing; |
| int blinkRate = 500; |
| 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 |
| * 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 Caret (Canvas parent, int style) { |
| super (parent, style); |
| this.parent = parent; |
| createWidget (0); |
| } |
| void createWidget (int index) { |
| super.createWidget (index); |
| isVisible = true; |
| if (parent.getCaret () == null) { |
| parent.setCaret (this); |
| } |
| } |
| |
| boolean blinkCaret () { |
| if (!isVisible) return true; |
| if (!isShowing) return showCaret(); |
| if (blinkRate==0) return true; |
| return hideCaret(); |
| } |
| |
| boolean drawCaret () { |
| if (parent == null) return false; |
| if (parent.isDisposed ()) return false; |
| int handle = parent.handle; |
| GtkWidget widget = new GtkWidget(); |
| OS.memmove (widget, handle, GtkWidget.sizeof); |
| int window = widget.window; |
| if (window == 0) return false; |
| int gc = OS.gdk_gc_new(window); |
| GdkGCValues gcvalues = new GdkGCValues(); |
| OS.gdk_gc_get_values(gc, gcvalues); |
| //GdkColor color = new GdkColor(); |
| //color.pixel = gcvalues.foreground_pixel ^ gcvalues.background_pixel; |
| //color.red = (short)(gcvalues.foreground_red ^ gcvalues.background_red); |
| //color.green = (short)(gcvalues.foreground_green ^ gcvalues.background_green); |
| //color.blue = (short)(gcvalues.foreground_blue ^ gcvalues.background_blue); |
| Color COLOR_DARK_RED = new Color (Display.getCurrent(), 0x80,0xFF,0xFF); |
| OS.gdk_gc_set_foreground(gc, COLOR_DARK_RED.handle); |
| OS.gdk_gc_set_function(gc, OS.GDK_XOR); |
| int nWidth = width; |
| if (nWidth <= 0) nWidth = 2; |
| OS.gdk_draw_rectangle(window, gc, 1, x, y, nWidth, height); |
| OS.gdk_gc_destroy(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 () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| return new Rectangle (x, y, width, height); |
| } |
| public Display getDisplay () { |
| Composite parent = this.parent; |
| if (parent == null) error (SWT.ERROR_WIDGET_DISPOSED); |
| return parent.getDisplay (); |
| } |
| /** |
| * 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 () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| return parent.getFont (); |
| } |
| /** |
| * 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 () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| 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 () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| 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 () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| 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 () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| return isVisible; |
| } |
| boolean hideCaret () { |
| // Display display = getDisplay (); |
| // if (display.currentCaret != this) return false; |
| if (!isShowing) return true; |
| isShowing = false; |
| return drawCaret (); |
| } |
| /** |
| * 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 isVisible () { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| return isVisible && parent.isVisible (); // && parent.hasFocus (); |
| } |
| void killFocus () { |
| // OS.DestroyCaret (); |
| // self restoreFont. |
| } |
| void move () { |
| showCaret(); |
| moved = false; |
| } |
| void releaseChild () { |
| super.releaseChild (); |
| if (this == parent.getCaret ()) parent.setCaret (null); |
| } |
| void releaseWidget () { |
| super.releaseWidget (); |
| parent = null; |
| } |
| void resize () { |
| int hwnd = parent.handle; |
| if (hwnd == 0) return; |
| // OS.DestroyCaret (); |
| // OS.CreateCaret (hwnd, 0, width, height); |
| // OS.SetCaretPos (x, y); |
| // OS.ShowCaret (hwnd); |
| // self move. |
| // showCaret(); |
| resized = false; |
| } |
| /** |
| * 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| boolean samePosition, sameExtent, showing; |
| samePosition = (this.x == x) && (this.y == y); |
| sameExtent = (this.width == width) && (this.height == height); |
| if (samePosition && sameExtent) return; |
| if (isShowing) hideCaret (); |
| this.x = x; this.y = y; |
| this.width = width; this.height = height; |
| if (sameExtent) { |
| moved = true; |
| if (isVisible ()) move (); |
| } else { |
| resized = true; |
| if (isVisible ()) resize (); |
| } |
| if(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) { |
| if (rect == null) error (SWT.ERROR_NULL_ARGUMENT); |
| setBounds (rect.x, rect.y, rect.width, rect.height); |
| } |
| void setFocus () { |
| Display display = getDisplay(); |
| 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| if (font != null && font.isDisposed ()) { |
| error (SWT.ERROR_INVALID_ARGUMENT); |
| } |
| } |
| |
| /** |
| * 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; |
| } |
| /** |
| * 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 font the new font (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); |
| } |
| if (isShowing) hideCaret (); |
| this.image = image; |
| if (isShowing) 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| if (this.width == width && this.height == height) return; |
| this.width = width; this.height = height; |
| resized = true; |
| if (isVisible ()) resize (); |
| } |
| /** |
| * Sets the receiver's size to the point specified by the argument. |
| * |
| * @param size the new extent for the receiver |
| * @param height the new height 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| 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) { |
| if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); |
| if (!isValidWidget ()) error (SWT.ERROR_WIDGET_DISPOSED); |
| if (visible == isVisible) return; |
| if (isVisible = visible) { |
| showCaret (); |
| } else { |
| hideCaret (); |
| } |
| |
| } |
| boolean showCaret () { |
| // if (getDisplay ().currentCaret != this) return false; |
| if (isShowing) return true; |
| isShowing = true; |
| return drawCaret (); |
| } |
| } |