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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui;
import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.debug.core.model.IThread;
import org.eclipse.debug.ui.IDebugEditorPresentation;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
/**
* An annotation for the vertical ruler in text editors that shows one of two
* images for the current instruction pointer when debugging (one for the top
* stack frame, one for all others).
*/
public class InstructionPointerAnnotation extends Annotation {
/**
* The frame for this instruction pointer annotation. This is necessary only so that
* instances of this class can be distinguished by equals().
*/
private IStackFrame fStackFrame;
/**
* Flag indicating if this annotation represents a top stack frame. Top stack frames
* have different images from all other stack frames.
*/
private boolean fTopStackFrame;
/**
* The layer at which to draw the instruction pointer annotation. The instruction pointer
* should be rendered on top of any other type of annotation or marker.
*
* @see org.eclipse.jface.text.source.Annotation
*/
private static final int INSTRUCTION_POINTER_ANNOTATION_LAYER = 6;
/**
* Construct an instruction pointer annotation for the given stack frame.
*
* @param stackFrame frame to create an instruction pointer annotation for
*/
public InstructionPointerAnnotation(IStackFrame stackFrame) {
setLayer(INSTRUCTION_POINTER_ANNOTATION_LAYER);
setStackFrame(stackFrame);
}
/**
* @see org.eclipse.jface.text.source.Annotation#paint(org.eclipse.swt.graphics.GC, org.eclipse.swt.widgets.Canvas, org.eclipse.swt.graphics.Rectangle)
*/
public void paint(GC gc, Canvas canvas, Rectangle bounds) {
Image image = getInstructionPointerImage(isTopStackFrame());
drawImage(image, gc, canvas, bounds, SWT.CENTER);
}
/**
* Returns the image associated with this instruction pointer.
*
* @return image associated with this instruction pointer
*/
private Image getInstructionPointerImage(boolean topStackFrame) {
IDebugEditorPresentation presentation = (IDebugEditorPresentation)DebugUIPlugin.getModelPresentation();
Image image = presentation.getInstructionPointerImage(getStackFrame());
if (image == null) {
if (topStackFrame) {
image = DebugPluginImages.getImage(IInternalDebugUIConstants.IMG_OBJS_INSTRUCTION_POINTER_TOP);
} else {
image = DebugPluginImages.getImage(IInternalDebugUIConstants.IMG_OBJS_INSTRUCTION_POINTER);
}
}
return image;
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object other) {
if (other instanceof InstructionPointerAnnotation) {
return getStackFrame().equals(((InstructionPointerAnnotation)other).getStackFrame());
}
return false;
}
/**
* @see java.lang.Object#hashCode()
*/
public int hashCode() {
return getStackFrame().hashCode();
}
/**
* Sets the stack frame associated with this annotation and determines
* if the frame is on top of the stack.
*
* @param stackFrame frame associated with this annotation
*/
private void setStackFrame(IStackFrame stackFrame) {
fStackFrame = stackFrame;
IThread thread = stackFrame.getThread();
try {
fTopStackFrame = stackFrame.equals(thread.getTopStackFrame());
} catch (DebugException de) {
fTopStackFrame = false;
}
}
/**
* Returns the stack frame associated with this annotation
*
* @return the stack frame associated with this annotation
*/
private IStackFrame getStackFrame() {
return fStackFrame;
}
/**
* Returns whether the stack frame associated with this annotation is the
* top stack frame in its thread.
*
* @return whether the stack frame associated with this annotation is the
* top stack frame in its thread
*/
private boolean isTopStackFrame() {
return fTopStackFrame;
}
}
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