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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 static com.android.ide.eclipse.adt.internal.editors.layout.gle2.SwtDrawingStyle.HOVER;
import static com.android.ide.eclipse.adt.internal.editors.layout.gle2.SwtDrawingStyle.HOVER_SELECTION;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import java.util.List;
/**
* The {@link HoverOverlay} paints an optional hover on top of the layout,
* highlighting the currently hovered view.
*/
public class HoverOverlay extends Overlay {
private final LayoutCanvas mCanvas;
/** Hover border color. Must be disposed, it's NOT a system color. */
private Color mHoverStrokeColor;
/** Hover fill color. Must be disposed, it's NOT a system color. */
private Color mHoverFillColor;
/** Hover border select color. Must be disposed, it's NOT a system color. */
private Color mHoverSelectStrokeColor;
/** Hover fill select color. Must be disposed, it's NOT a system color. */
private Color mHoverSelectFillColor;
/** Vertical scaling & scrollbar information. */
private CanvasTransform mVScale;
/** Horizontal scaling & scrollbar information. */
private CanvasTransform mHScale;
/**
* Current mouse hover border rectangle. Null when there's no mouse hover.
* The rectangle coordinates do not take account of the translation, which
* must be applied to the rectangle when drawing.
*/
private Rectangle mHoverRect;
/**
* Constructs a new {@link HoverOverlay} linked to the given view hierarchy.
*
* @param canvas the associated canvas
* @param hScale The {@link CanvasTransform} to use to transfer horizontal layout
* coordinates to screen coordinates.
* @param vScale The {@link CanvasTransform} to use to transfer vertical layout
* coordinates to screen coordinates.
*/
public HoverOverlay(LayoutCanvas canvas, CanvasTransform hScale, CanvasTransform vScale) {
mCanvas = canvas;
mHScale = hScale;
mVScale = vScale;
}
@Override
public void create(Device device) {
if (SwtDrawingStyle.HOVER.getStrokeColor() != null) {
mHoverStrokeColor = new Color(device, SwtDrawingStyle.HOVER.getStrokeColor());
}
if (SwtDrawingStyle.HOVER.getFillColor() != null) {
mHoverFillColor = new Color(device, SwtDrawingStyle.HOVER.getFillColor());
}
if (SwtDrawingStyle.HOVER_SELECTION.getStrokeColor() != null) {
mHoverSelectStrokeColor = new Color(device,
SwtDrawingStyle.HOVER_SELECTION.getStrokeColor());
}
if (SwtDrawingStyle.HOVER_SELECTION.getFillColor() != null) {
mHoverSelectFillColor = new Color(device,
SwtDrawingStyle.HOVER_SELECTION.getFillColor());
}
}
@Override
public void dispose() {
if (mHoverStrokeColor != null) {
mHoverStrokeColor.dispose();
mHoverStrokeColor = null;
}
if (mHoverFillColor != null) {
mHoverFillColor.dispose();
mHoverFillColor = null;
}
if (mHoverSelectStrokeColor != null) {
mHoverSelectStrokeColor.dispose();
mHoverSelectStrokeColor = null;
}
if (mHoverSelectFillColor != null) {
mHoverSelectFillColor.dispose();
mHoverSelectFillColor = null;
}
}
/**
* Sets the hover rectangle. The coordinates of the rectangle are in layout
* coordinates. The recipient is will own this rectangle.
* <p/>
* TODO: Consider switching input arguments to two {@link LayoutPoint}s so
* we don't have ambiguity about the coordinate system of these input
* parameters.
* <p/>
*
* @param x The top left x coordinate, in layout coordinates, of the hover.
* @param y The top left y coordinate, in layout coordinates, of the hover.
* @param w The width of the hover (in layout coordinates).
* @param h The height of the hover (in layout coordinates).
*/
public void setHover(int x, int y, int w, int h) {
mHoverRect = new Rectangle(x, y, w, h);
}
/**
* Removes the hover for the next paint.
*/
public void clearHover() {
mHoverRect = null;
}
@Override
public void paint(GC gc) {
if (mHoverRect != null) {
// Translate the hover rectangle (in canvas coordinates) to control
// coordinates
int x = mHScale.translate(mHoverRect.x);
int y = mVScale.translate(mHoverRect.y);
int w = mHScale.scale(mHoverRect.width);
int h = mVScale.scale(mHoverRect.height);
boolean hoverIsSelected = false;
List<SelectionItem> selections = mCanvas.getSelectionManager().getSelections();
for (SelectionItem item : selections) {
if (mHoverRect.equals(item.getViewInfo().getSelectionRect())) {
hoverIsSelected = true;
break;
}
}
Color stroke = hoverIsSelected ? mHoverSelectStrokeColor : mHoverStrokeColor;
Color fill = hoverIsSelected ? mHoverSelectFillColor : mHoverFillColor;
if (stroke != null) {
int oldAlpha = gc.getAlpha();
gc.setForeground(stroke);
gc.setLineStyle(hoverIsSelected ?
HOVER_SELECTION.getLineStyle() : HOVER.getLineStyle());
gc.setAlpha(hoverIsSelected ?
HOVER_SELECTION.getStrokeAlpha() : HOVER.getStrokeAlpha());
gc.drawRectangle(x, y, w, h);
gc.setAlpha(oldAlpha);
}
if (fill != null) {
int oldAlpha = gc.getAlpha();
gc.setAlpha(hoverIsSelected ?
HOVER_SELECTION.getFillAlpha() : HOVER.getFillAlpha());
gc.setBackground(fill);
gc.fillRectangle(x, y, w, h);
gc.setAlpha(oldAlpha);
}
}
}
}
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