| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Eclipse Public License, Version 1.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.eclipse.org/org/documents/epl-v10.php |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.ide.eclipse.adt.internal.editors.layout.gle2; |
| |
| import com.android.annotations.VisibleForTesting; |
| |
| import org.eclipse.swt.SWT; |
| 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 java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| |
| /** |
| * The {@link IncludeOverlay} class renders masks to -partially- hide everything outside |
| * an included file's own content. This overlay is in use when you are editing an included |
| * file shown within a different file's context (e.g. "Show In > other"). |
| */ |
| public class IncludeOverlay extends Overlay { |
| /** Mask transparency - 0 is transparent, 255 is opaque */ |
| private static final int MASK_TRANSPARENCY = 160; |
| |
| /** The associated {@link LayoutCanvas}. */ |
| private LayoutCanvas mCanvas; |
| |
| /** |
| * Constructs an {@link IncludeOverlay} tied to the given canvas. |
| * |
| * @param canvas The {@link LayoutCanvas} to paint the overlay over. |
| */ |
| public IncludeOverlay(LayoutCanvas canvas) { |
| mCanvas = canvas; |
| } |
| |
| @Override |
| public void paint(GC gc) { |
| ViewHierarchy viewHierarchy = mCanvas.getViewHierarchy(); |
| List<Rectangle> includedBounds = viewHierarchy.getIncludedBounds(); |
| if (includedBounds == null || includedBounds.size() == 0) { |
| // We don't support multiple included children yet. When that works, |
| // this code should use a BSP tree to figure out which regions to paint |
| // to leave holes in the mask. |
| return; |
| } |
| |
| Image image = mCanvas.getImageOverlay().getImage(); |
| if (image == null) { |
| return; |
| } |
| |
| int oldAlpha = gc.getAlpha(); |
| gc.setAlpha(MASK_TRANSPARENCY); |
| Color bg = gc.getDevice().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND); |
| gc.setBackground(bg); |
| |
| CanvasViewInfo root = viewHierarchy.getRoot(); |
| Rectangle whole = root.getAbsRect(); |
| whole = new Rectangle(whole.x, whole.y, whole.width + 1, whole.height + 1); |
| Collection<Rectangle> masks = subtractRectangles(whole, includedBounds); |
| |
| for (Rectangle mask : masks) { |
| ControlPoint topLeft = LayoutPoint.create(mCanvas, mask.x, mask.y).toControl(); |
| ControlPoint bottomRight = LayoutPoint.create(mCanvas, mask.x + mask.width, |
| mask.y + mask.height).toControl(); |
| int x1 = topLeft.x; |
| int y1 = topLeft.y; |
| int x2 = bottomRight.x; |
| int y2 = bottomRight.y; |
| |
| gc.fillRectangle(x1, y1, x2 - x1, y2 - y1); |
| } |
| |
| gc.setAlpha(oldAlpha); |
| } |
| |
| /** |
| * Given a Rectangle, remove holes from it (specified as a collection of Rectangles) such |
| * that the result is a list of rectangles that cover everything that is not a hole. |
| * |
| * @param rectangle the rectangle to subtract from |
| * @param holes the holes to subtract from the rectangle |
| * @return a list of sub rectangles that remain after subtracting out the given list of holes |
| */ |
| @VisibleForTesting |
| static Collection<Rectangle> subtractRectangles( |
| Rectangle rectangle, Collection<Rectangle> holes) { |
| List<Rectangle> result = new ArrayList<Rectangle>(); |
| result.add(rectangle); |
| |
| for (Rectangle hole : holes) { |
| List<Rectangle> tempResult = new ArrayList<Rectangle>(); |
| for (Rectangle r : result) { |
| if (hole.intersects(r)) { |
| // Clip the hole to fit the rectangle bounds |
| Rectangle h = hole.intersection(r); |
| |
| // Split the rectangle |
| |
| // Above (includes the NW and NE corners) |
| if (h.y > r.y) { |
| tempResult.add(new Rectangle(r.x, r.y, r.width, h.y - r.y)); |
| } |
| |
| // Left (not including corners) |
| if (h.x > r.x) { |
| tempResult.add(new Rectangle(r.x, h.y, h.x - r.x, h.height)); |
| } |
| |
| int hx2 = h.x + h.width; |
| int hy2 = h.y + h.height; |
| int rx2 = r.x + r.width; |
| int ry2 = r.y + r.height; |
| |
| // Below (includes the SW and SE corners) |
| if (hy2 < ry2) { |
| tempResult.add(new Rectangle(r.x, hy2, r.width, ry2 - hy2)); |
| } |
| |
| // Right (not including corners) |
| if (hx2 < rx2) { |
| tempResult.add(new Rectangle(hx2, h.y, rx2 - hx2, h.height)); |
| } |
| } else { |
| tempResult.add(r); |
| } |
| } |
| |
| result = tempResult; |
| } |
| |
| return result; |
| } |
| } |