/**
* Copyright (c) 2017 Angelo ZERR.
* 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:
* Angelo Zerr <angelo.zerr@gmail.com> - [CodeMining] Provide inline annotations support - Bug 527675
*/
package org.eclipse.jface.text.source.inlined;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.GlyphMetrics;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.ITextViewerExtension5;
import org.eclipse.jface.text.JFaceTextUtil;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.AnnotationPainter.IDrawingStrategy;
/**
* {@link IDrawingStrategy} implementation to render {@link AbstractInlinedAnnotation}.
*
* @since 3.13
*/
class InlinedAnnotationDrawingStrategy implements IDrawingStrategy {
@Override
public void draw(Annotation annotation, GC gc, StyledText textWidget, int offset, int length, Color color) {
if (!(annotation instanceof AbstractInlinedAnnotation)) {
return;
}
InlinedAnnotationDrawingStrategy.draw((AbstractInlinedAnnotation) annotation, gc, textWidget, offset, length,
color);
}
/**
* Draw the inlined annotation.
*
* @param annotation the annotation to be drawn
* @param gc the graphics context, <code>null</code> when in clearing mode
* @param textWidget the text widget to draw on
* @param offset the offset of the line
* @param length the length of the line
* @param color the color of the line
*/
public static void draw(AbstractInlinedAnnotation annotation, GC gc, StyledText textWidget, int offset, int length,
Color color) {
if (annotation.isMarkedDeleted()) {
// When annotation is deleted, redraw the styled text to hide old draw of
// annotations
textWidget.redraw();
// update caret offset since line spacing has changed.
textWidget.setCaretOffset(textWidget.getCaretOffset());
return;
}
if (annotation instanceof LineHeaderAnnotation) {
draw((LineHeaderAnnotation) annotation, gc, textWidget, offset, length, color);
} else {
draw((LineContentAnnotation) annotation, gc, textWidget, offset, length, color);
}
}
/**
* Draw the line header annotation in the line spacing of the previous line.
*
* @param annotation the annotation to be drawn
* @param gc the graphics context, <code>null</code> when in clearing mode
* @param textWidget the text widget to draw on
* @param offset the offset of the line
* @param length the length of the line
* @param color the color of the line
*/
private static void draw(LineHeaderAnnotation annotation, GC gc, StyledText textWidget, int offset, int length,
Color color) {
// compute current, previous line index.
int lineIndex= -1;
try {
lineIndex= textWidget.getLineAtOffset(offset);
} catch (Exception e) {
return;
}
int previousLineIndex= lineIndex - 1;
// check the previous line index where annotation must be drawn in line spacing is not hidden
ITextViewer viewer= annotation.getViewer();
int firstLineIndex= JFaceTextUtil.getPartialTopIndex(viewer);
if (viewer instanceof ITextViewerExtension5) {
firstLineIndex= ((ITextViewerExtension5) viewer).modelLine2WidgetLine(firstLineIndex);
}
if (gc != null) {
// Compute the location of the annotation
int x= textWidget.getLocationAtOffset(offset).x;
int y= 0;
int height= annotation.getHeight();
if (lineIndex > 0) {
int previousOffset= textWidget.getOffsetAtLine(previousLineIndex);
y= textWidget.getLocationAtOffset(previousOffset).y + height;
}
Rectangle clipping= gc.getClipping();
if (clipping.contains(x, y)) {
// GC clipping contains the x, y where annotation must be drawn.
// Colorize line spacing area with the background of StyledText to avoid having highlighted line color
gc.setBackground(textWidget.getBackground());
Rectangle client= textWidget.getClientArea();
textWidget.drawBackground(gc, x, y, client.width, height);
// draw the annotation
annotation.draw(gc, textWidget, offset, length, color, x, y);
return;
} else {
if (!(clipping.y - height == y)) {
// Clipping doesn't include the y of previous line spacing, stop the redraw
// range.
return;
}
}
}
if (previousLineIndex < 0) {
// There are none previous line, do nothing
return;
}
// refresh the previous line range where line header annotation must be drawn.
int previousOffset= textWidget.getOffsetAtLine(previousLineIndex);
int lineLength= offset - previousOffset;
textWidget.redrawRange(previousOffset, lineLength, true);
}
/**
* Draw the line content annotation inside line in the empty area computed by
* {@link GlyphMetrics}.
*
* @param annotation the annotation to be drawn
* @param gc the graphics context, <code>null</code> when in clearing mode
* @param textWidget the text widget to draw on
* @param offset the offset of the line
* @param length the length of the line
* @param color the color of the line
*/
private static void draw(LineContentAnnotation annotation, GC gc, StyledText textWidget, int offset, int length,
Color color) {
if (gc != null) {
// Compute the location of the annotation
FontMetrics fontMetrics= gc.getFontMetrics();
Rectangle bounds= textWidget.getTextBounds(offset, offset);
int x= bounds.x + fontMetrics.getLeading();
int y= bounds.y + fontMetrics.getDescent();
// Draw the line content annotation
annotation.draw(gc, textWidget, offset, length, color, x, y);
// The inline annotation replaces one character by taking a place width
// GlyphMetrics
// Here we need to redraw this first character because GlyphMetrics clip this
// character.
String s= textWidget.getText(offset, offset);
StyleRange style= textWidget.getStyleRangeAtOffset(offset);
if (style != null) {
if (style.background != null) {
gc.setBackground(style.background);
}
if (style.foreground != null) {
gc.setForeground(style.foreground);
}
}
gc.drawString(s, bounds.x + bounds.width - gc.stringExtent(s).x, bounds.y, true);
} else {
textWidget.redrawRange(offset, length, true);
}
}
}
