import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSource;
-import org.eclipse.swt.dnd.DragSourceEffect;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.Transfer;
continue;
}
- Item item = new Item(group, this, desc);
+ Item item = new Item(group, desc);
toggle.addItem(item);
GridDataBuilder.create(item).hFill().hGrab();
}
* An Item widget represents one {@link ElementDescriptor} that can be dropped on the
* GLE2 canvas using drag'n'drop.
*/
- private static class Item extends CLabel implements MouseTrackListener {
+ private class Item extends CLabel implements MouseTrackListener {
private boolean mMouseIn;
private DragSource mSource;
- private final ElementDescriptor mDesc;
- public PaletteControl mPalette;
+ private final ViewElementDescriptor mDesc;
- public Item(Composite parent, PaletteControl palette, ElementDescriptor desc) {
+ public Item(Composite parent, ViewElementDescriptor desc) {
super(parent, SWT.NONE);
- mPalette = palette;
mDesc = desc;
mMouseIn = false;
// DND Reference: http://www.eclipse.org/articles/Article-SWT-DND/DND-in-SWT.html
mSource = new DragSource(this, DND.DROP_COPY);
mSource.setTransfer(new Transfer[] { SimpleXmlTransfer.getInstance() });
- mSource.addDragListener(new DescDragSourceListener(this));
- mSource.setDragSourceEffect(new PreviewDragSourceEffect(this));
+ mSource.addDragListener(new DescDragSourceListener(mDesc));
}
@Override
public void mouseHover(MouseEvent e) {
// pass
}
-
- /* package */ ElementDescriptor getDescriptor() {
- return mDesc;
- }
-
- /* package */ GraphicalEditorPart getEditor() {
- return mPalette.getEditor();
- }
-
- /* package */ DragSource getDragSource() {
- return mSource;
- }
}
/**
* A {@link DragSourceListener} that deals with drag'n'drop of
* {@link ElementDescriptor}s.
*/
- private static class DescDragSourceListener implements DragSourceListener {
- private final Item mItem;
+ private class DescDragSourceListener implements DragSourceListener {
+ private final ViewElementDescriptor mDesc;
private SimpleElement[] mElements;
- public DescDragSourceListener(Item item) {
- mItem = item;
+ public DescDragSourceListener(ViewElementDescriptor desc) {
+ mDesc = desc;
}
public void dragStart(DragSourceEvent e) {
// Preview images are created before the drag source listener is notified
// of the started drag.
Rect bounds = null;
- DragSource dragSource = mItem.getDragSource();
- DragSourceEffect dragSourceEffect = dragSource.getDragSourceEffect();
Rect dragBounds = null;
- if (dragSourceEffect instanceof PreviewDragSourceEffect) {
- PreviewDragSourceEffect preview = (PreviewDragSourceEffect) dragSourceEffect;
- Image previewImage = preview.getPreviewImage();
- if (previewImage != null && !preview.isPlaceholder()) {
- ImageData data = previewImage.getImageData();
- int width = data.width;
- int height = data.height;
- bounds = new Rect(0, 0, width, height);
- dragBounds = new Rect(-width / 2, -height / 2, width, height);
- }
+
+ createDragImage(e);
+ if (mImage != null && !mIsPlaceholder) {
+ ImageData data = mImage.getImageData();
+ int width = data.width;
+ int height = data.height;
+ bounds = new Rect(0, 0, width, height);
+ dragBounds = new Rect(-width / 2, -height / 2, width, height);
}
SimpleElement se = new SimpleElement(
- SimpleXmlTransfer.getFqcn(mItem.getDescriptor()),
+ SimpleXmlTransfer.getFqcn(mDesc),
null /* parentFqcn */,
bounds /* bounds */,
null /* parentBounds */);
// Unregister the dragged data.
GlobalCanvasDragInfo.getInstance().stopDrag();
mElements = null;
+ if (mImage != null) {
+ mImage.dispose();
+ mImage = null;
+ }
}
- }
- /**
- * A {@link DragSourceEffect} (an image shown under the drag cursor) which renders a
- * preview of the given item.
- */
- private static class PreviewDragSourceEffect extends DragSourceEffect {
// TODO: Figure out the right dimensions to use for rendering.
// We WILL crop this after rendering, but for performance reasons it would be good
// not to make it much larger than necessary since to crop this we rely on
/** Amount of alpha to multiply into the image (divided by 256) */
private static final int IMG_ALPHA = 216;
- /** The item this preview is rendering a preview for */
- private final Item mItem;
-
/** The image shown by the drag source effect */
private Image mImage;
*/
private boolean mIsPlaceholder;
- private PreviewDragSourceEffect(Item item) {
- super(item);
- mItem = item;
- }
-
- @Override
- public void dragStart(DragSourceEvent event) {
+ private void createDragImage(DragSourceEvent event) {
mImage = renderPreview();
mIsPlaceholder = mImage == null;
// example the preview of an empty layout), so instead create a placeholder
// image
// Render the palette item itself as an image
- Control control = getControl();
+ Control control = PaletteControl.this;
GC gc = new GC(control);
Point size = control.getSize();
- final Image image = new Image(mItem.getDisplay(), size.x, size.y);
+ Display display = getDisplay();
+ final Image image = new Image(display, size.x, size.y);
gc.copyArea(image, 0, 0);
gc.dispose();
- Display display = mItem.getDisplay();
BufferedImage awtImage = SwtUtils.convertToAwt(image);
if (awtImage != null) {
awtImage = ImageUtils.createDropShadow(awtImage, 3 /* shadowSize */,
event.offsetY = imageBounds.height / 2;
}
-
- event.doit = true;
- }
-
- @Override
- public void dragFinished(DragSourceEvent event) {
- super.dragFinished(event);
-
- if (mImage != null) {
- mImage.dispose();
- mImage = null;
- }
- }
-
- @Override
- public void dragSetData(DragSourceEvent event) {
- super.dragSetData(event);
}
/** Performs the actual rendering of the descriptor into an image */
}
// Insert our target view's XML into it as a node
- ElementDescriptor desc = mItem.getDescriptor();
- GraphicalEditorPart editor = mItem.getEditor();
+ GraphicalEditorPart editor = getEditor();
LayoutEditor layoutEditor = editor.getLayoutEditor();
- String viewName = desc.getXmlLocalName();
+ String viewName = mDesc.getXmlLocalName();
Element element = document.createElement(viewName);
// Set up a proper name space
// This doesn't apply to all, but doesn't seem to cause harm and makes for a
// better experience with text-oriented views like buttons and texts
- element.setAttributeNS(SdkConstants.NS_RESOURCES, ATTR_TEXT, desc.getUiName());
+ element.setAttributeNS(SdkConstants.NS_RESOURCES, ATTR_TEXT, mDesc.getUiName());
document.appendChild(element);
!hasTransparency ? 0.6f : needsContrast ? 0.8f : 0.7f/*alpha*/,
0x000000 /* shadowRgb */);
- Display display = getControl().getDisplay();
+ Display display = getDisplay();
int alpha = (!hasTransparency || !needsContrast) ? IMG_ALPHA : -1;
Image swtImage = SwtUtils.convertToSwt(display, cropped, true, alpha);
return swtImage;
* as commented out code the code won't be accidentally broken.
*/
@SuppressWarnings("all")
- private static void dumpDocument(Document document) {
+ private void dumpDocument(Document document) {
// Diagnostics: print out the XML that we're about to render
if (false) { // Will be omitted by the compiler
org.apache.xml.serialize.OutputFormat outputFormat =
}
}
}
-
- /**
- * Returns the image shown as the drag source effect. The image may be a preview
- * of the palette item, or just a placeholder image; {@link #isPlaceholder()} can
- * tell the difference.
- *
- * @return the image shown as preview. May be null (between drags).
- */
- /* package */ Image getPreviewImage() {
- return mImage;
- }
-
- /**
- * Returns true if the image returned by {@link #getPreviewImage()} is just a
- * placeholder for a real preview, and false if the image is an actual preview.
- *
- * @return true if the preview image is just a placeholder
- */
- /* package */ boolean isPlaceholder() {
- return mIsPlaceholder;
- }
}
}
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