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CrazyCanvas.java
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CrazyCanvas.java
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package net.jeeeyul.pdetools.crazyoutline;
import net.jeeeyul.pdetools.PDEToolsCore;
import net.jeeeyul.swtend.SWTExtensions;
import net.jeeeyul.swtend.ui.HSB;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentListener;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jface.text.source.IAnnotationModelListener;
import org.eclipse.jface.text.source.projection.ProjectionAnnotationModel;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.graphics.TextLayout;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.ui.progress.UIJob;
public class CrazyCanvas extends Canvas implements IDocumentListener, IAnnotationModelListener, IPropertyChangeListener {
private SWTExtensions swt = SWTExtensions.INSTANCE;
private StyledText textWidget;
private Image buffer;
private TextLayout textLayout;
private Transform transform;
private float scale = 1f;
private Rectangle selection = new Rectangle(0, 0, 0, 0);
private IDocument document;
private ProjectionAnnotationModel pam;
private UIJob invalidateJob;
public UIJob getInvalidateJob() {
if (invalidateJob == null) {
invalidateJob = new UIJob("invalidate crazy canvas") {
@Override
public IStatus runInUIThread(IProgressMonitor monitor) {
doInvalidate();
return Status.OK_STATUS;
}
};
invalidateJob.setDisplay(getDisplay());
invalidateJob.setSystem(true);
}
return invalidateJob;
}
public CrazyCanvas(Composite parent, StyledText textWidget, IDocument document) {
this(parent, textWidget, document, null);
}
public CrazyCanvas(Composite parent, StyledText textWidget, IDocument document, ProjectionAnnotationModel pam) {
super(parent, SWT.DOUBLE_BUFFERED);
this.textWidget = textWidget;
this.document = document;
this.pam = pam;
hook();
addListener(SWT.Dispose, new Listener() {
@Override
public void handleEvent(Event event) {
handleDispose();
}
});
new CrazyDragger(this);
}
private float computeScale(Rectangle viewBounds, Rectangle textBounds) {
float scale = 1f;
if (textBounds.width > viewBounds.width) {
scale = viewBounds.width / (float) textBounds.width;
}
if (textBounds.height * scale > viewBounds.height) {
scale = viewBounds.height / (float) textBounds.height;
}
return scale;
}
private void computeSelection(boolean updateTextWidget) {
Rectangle newSelection = new Rectangle(0, 0, 0, 0);
newSelection.x = textWidget.getHorizontalPixel();
newSelection.y = textWidget.getTopPixel();
int hThumb = textWidget.getHorizontalBar().getThumb();
if (hThumb == 1) {
newSelection.width = textWidget.getClientArea().width;
} else {
newSelection.width = hThumb;
}
int vThumb = textWidget.getVerticalBar().getThumb();
if (vThumb == 1) {
newSelection.height = textWidget.getClientArea().height;
} else {
newSelection.height = vThumb;
}
setSelection(newSelection, updateTextWidget);
}
@Override
public void documentAboutToBeChanged(DocumentEvent event) {
}
@Override
public void documentChanged(DocumentEvent event) {
invalidate();
}
private void drawSelection(GC gc) {
if (selection == null) {
computeSelection(false);
}
Rectangle clientArea = getClientArea();
Rectangle box = swt.getScaled(selection, scale);
if (box.x + box.width >= clientArea.width) {
box.width = clientArea.width - box.x - 1;
}
if (box.y + box.height >= clientArea.height) {
box.height = clientArea.height - box.y - 1;
}
Region region = new Region(getDisplay());
region.add(clientArea);
region.subtract(box);
gc.setClipping(region);
IPreferenceStore store = PDEToolsCore.getDefault().getPreferenceStore();
HSB fogHSB = HSB.deserialize(store.getString(CrazyOutlineConstants.FOG_COLOR));
Color fogColor = new Color(getDisplay(), fogHSB.toRGB());
gc.setBackground(fogColor);
gc.setAlpha(store.getInt(CrazyOutlineConstants.FOG_TRANSPARENCY));
gc.fillRectangle(clientArea.x, clientArea.y, clientArea.width, clientArea.height);
fogColor.dispose();
gc.setClipping(clientArea);
region.dispose();
gc.setAlpha(255);
gc.setForeground(getDisplay().getSystemColor(SWT.COLOR_LIST_SELECTION));
gc.drawRectangle(box);
}
private void drawText(GC gc) {
if (!isBufferReady()) {
prepareBuffer();
}
gc.drawImage(buffer, 0, 0);
}
public float getScale() {
return scale;
}
public Rectangle getSelection() {
return selection;
}
private TextLayout getSharedTextLayout() {
if (textLayout == null) {
textLayout = new TextLayout(getDisplay());
addListener(SWT.Dispose, new Listener() {
@Override
public void handleEvent(Event event) {
textLayout.dispose();
}
});
}
return textLayout;
}
private Transform getSharedTransform() {
if (transform == null || transform.isDisposed()) {
transform = new Transform(getDisplay());
addListener(SWT.Dispose, new Listener() {
@Override
public void handleEvent(Event event) {
transform.dispose();
}
});
}
return transform;
}
public StyledText getTextWidget() {
return textWidget;
}
private void handleDispose() {
document.removeDocumentListener(this);
if (pam != null) {
pam.removeAnnotationModelListener(this);
}
PDEToolsCore.getDefault().getPreferenceStore().removePropertyChangeListener(this);
}
private void hook() {
addListener(SWT.Resize, new Listener() {
@Override
public void handleEvent(Event event) {
onResize(event);
}
});
addListener(SWT.Paint, new Listener() {
@Override
public void handleEvent(Event event) {
onPaint(event);
}
});
document.addDocumentListener(this);
textWidget.getVerticalBar().addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
invalidateSelection();
}
});
textWidget.getHorizontalBar().addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
invalidateSelection();
}
});
if (pam != null)
pam.addAnnotationModelListener(this);
PDEToolsCore.getDefault().getPreferenceStore().addPropertyChangeListener(this);
}
public void invalidate() {
if (textWidget.isDisposed() || isDisposed()) {
return;
}
getInvalidateJob().cancel();
getInvalidateJob().schedule(2000);
}
private void doInvalidate() {
if (textWidget.isDisposed() || isDisposed()) {
return;
}
swt.safeDispose(buffer);
invalidateSelection();
redraw();
}
private void invalidateSelection() {
if (textWidget.isDisposed() || isDisposed()) {
return;
}
selection = null;
redraw();
}
private boolean isBufferReady() {
return buffer != null && !buffer.isDisposed();
}
private void onPaint(Event event) {
drawText(event.gc);
drawSelection(event.gc);
}
private void onResize(Event event) {
invalidate();
}
private void prepareBuffer() {
swt.safeDispose(buffer);
Rectangle bounds = getClientArea();
buffer = new Image(getDisplay(), bounds.width, bounds.height);
Rectangle textBounds = null;
if (textWidget.getCharCount() > 0) {
textBounds = textWidget.getTextBounds(0, textWidget.getCharCount() - 1);
} else {
textBounds = new Rectangle(1, 1, 1, 1);
}
this.scale = computeScale(bounds, textBounds);
Transform transform = getSharedTransform();
transform.identity();
transform.scale(scale, scale);
GC gc = new GC(buffer);
gc.setBackground(textWidget.getBackground());
gc.fillRectangle(bounds);
gc.setTransform(transform);
TextLayout layout = getSharedTextLayout();
layout.setFont(textWidget.getFont());
layout.setSpacing(textWidget.getLineSpacing());
layout.setTabs(textWidget.getTabStops());
int lineCount = textWidget.getLineCount();
for (int l = 0; l < lineCount; l++) {
int start = textWidget.getOffsetAtLine(l);
int end = start;
boolean isEndLine = l == lineCount - 1;
if (!isEndLine) {
end = textWidget.getOffsetAtLine(l + 1) - 1;
} else {
end = textWidget.getCharCount() - 1;
}
if (start > end) {
continue;
}
String lineText = textWidget.getText(start, end);
if (lineText.trim().isEmpty()) {
continue;
}
StyleRange[] ranges = textWidget.getStyleRanges(start, end - start);
layout.setText(lineText);
for (StyleRange each : ranges) {
layout.setStyle(each, each.start - start, each.start + each.length);
}
layout.draw(gc, 0, textWidget.getLineHeight() * l);
}
gc.dispose();
}
public void setSelection(Rectangle rectangle, boolean updateTextWidget) {
if (updateTextWidget) {
textWidget.setTopPixel(rectangle.y);
textWidget.setHorizontalPixel(rectangle.x);
invalidateSelection();
return;
}
this.selection = rectangle;
redraw();
}
@Override
public void modelChanged(IAnnotationModel model) {
invalidate();
}
@Override
public void propertyChange(PropertyChangeEvent event) {
if (event.getProperty() == null) {
return;
}
if (event.getProperty().startsWith("crazy-")) {
invalidate();
}
}
}