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/*
* 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 org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.GC;
/**
* An Overlay is a set of graphics which can be painted on top of the visual
* editor. Different {@link Gesture}s produce context specific overlays, such as
* swiping rectangles from the {@link MarqueeGesture} and guidelines from the
* {@link MoveGesture}.
*/
public abstract class Overlay {
private Device mDevice;
/** Whether the hover is hidden */
private boolean mHiding;
/**
* Construct the overlay, using the given graphics context for painting.
*/
public Overlay() {
super();
}
/**
* Initializes the overlay before the first use, if applicable. This is a
* good place to initialize resources like colors.
*
* @param device The device to allocate resources for; the parameter passed
* to {@link #paint} will correspond to this device.
*/
public void create(Device device) {
mDevice = device;
}
/**
* Releases resources held by the overlay. Called by the editor when an
* overlay has been removed.
*/
public void dispose() {
}
/**
* Paints the overlay.
*
* @param gc The SWT {@link GC} object to draw into.
*/
public void paint(GC gc) {
throw new IllegalArgumentException("paint() not implemented, probably done "
+ "with specialized paint signature");
}
/** Returns the device associated with this overlay */
public Device getDevice() {
return mDevice;
}
/**
* Returns whether the overlay is hidden
*
* @return true if the selection overlay is hidden
*/
public boolean isHiding() {
return mHiding;
}
/**
* Hides the overlay
*
* @param hiding true to hide the overlay, false to unhide it (default)
*/
public void setHiding(boolean hiding) {
mHiding = hiding;
}
}
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