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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 com.android.ide.common.api.Point;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
/**
* A {@link LayoutPoint} is a coordinate in the Android canvas (in other words,
* it may differ from the canvas control mouse coordinate because the canvas may
* be zoomed and scrolled.)
*/
public final class LayoutPoint {
/** Containing canvas which the point is relative to. */
private final LayoutCanvas mCanvas;
/** The X coordinate of the canvas coordinate. */
public final int x;
/** The Y coordinate of the canvas coordinate. */
public final int y;
/**
* Constructs a new {@link LayoutPoint} from the given event. The event
* must be from a {@link MouseListener} associated with the
* {@link LayoutCanvas} such that the {@link MouseEvent#x} and
* {@link MouseEvent#y} fields are relative to the canvas.
*
* @param canvas The {@link LayoutCanvas} this point is within.
* @param event The mouse event to construct the {@link LayoutPoint}
* from.
* @return A {@link LayoutPoint} which corresponds to the given
* {@link MouseEvent}.
*/
public static LayoutPoint create(LayoutCanvas canvas, MouseEvent event) {
// The mouse event coordinates should already be relative to the canvas
// widget.
assert event.widget == canvas : event.widget;
return ControlPoint.create(canvas, event).toLayout();
}
/**
* Constructs a new {@link LayoutPoint} from the given event. The event
* must be from a {@link DragSourceListener} associated with the
* {@link LayoutCanvas} such that the {@link DragSourceEvent#x} and
* {@link DragSourceEvent#y} fields are relative to the canvas.
*
* @param canvas The {@link LayoutCanvas} this point is within.
* @param event The mouse event to construct the {@link LayoutPoint}
* from.
* @return A {@link LayoutPoint} which corresponds to the given
* {@link DragSourceEvent}.
*/
public static LayoutPoint create(LayoutCanvas canvas, DragSourceEvent event) {
// The drag source event coordinates should already be relative to the
// canvas widget.
return ControlPoint.create(canvas, event).toLayout();
}
/**
* Constructs a new {@link LayoutPoint} from the given x,y coordinates.
*
* @param canvas The {@link LayoutCanvas} this point is within.
* @param x The mouse event x coordinate relative to the canvas
* @param y The mouse event x coordinate relative to the canvas
* @return A {@link LayoutPoint} which corresponds to the given
* layout coordinates.
*/
public static LayoutPoint create(LayoutCanvas canvas, int x, int y) {
return new LayoutPoint(canvas, x, y);
}
/**
* Constructs a new {@link LayoutPoint} with the given X and Y coordinates.
*
* @param canvas The canvas which contains this coordinate
* @param x The canvas X coordinate
* @param y The canvas Y coordinate
*/
private LayoutPoint(LayoutCanvas canvas, int x, int y) {
mCanvas = canvas;
this.x = x;
this.y = y;
}
/**
* Returns the equivalent {@link ControlPoint} to this
* {@link LayoutPoint}.
*
* @return The equivalent {@link ControlPoint} to this
* {@link LayoutPoint}
*/
public ControlPoint toControl() {
int cx = mCanvas.getHorizontalTransform().translate(x);
int cy = mCanvas.getVerticalTransform().translate(y);
return ControlPoint.create(mCanvas, cx, cy);
}
/**
* Returns this {@link LayoutPoint} as a {@link Point}, in the same coordinate space.
*
* @return a new {@link Point} in the same coordinate space
*/
public Point toPoint() {
return new Point(x, y);
}
@Override
public String toString() {
return "LayoutPoint [x=" + x + ", y=" + y + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + x;
result = prime * result + y;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
LayoutPoint other = (LayoutPoint) obj;
if (x != other.x)
return false;
if (y != other.y)
return false;
return true;
}
}
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