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/*
* Copyright (C) 2012 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.LintOverlay.ICON_SIZE;
import com.android.annotations.Nullable;
import com.android.ide.eclipse.adt.internal.editors.layout.LayoutEditorDelegate;
import com.android.ide.eclipse.adt.internal.editors.layout.uimodel.UiViewElementNode;
import com.android.ide.eclipse.adt.internal.preferences.AdtPrefs;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.w3c.dom.Node;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/** Tooltip in the layout editor showing lint errors under the cursor */
class LintTooltipManager implements Listener {
private final LayoutCanvas mCanvas;
private Shell mTip = null;
private List<UiViewElementNode> mShowingNodes;
/**
* Sets up a custom tooltip when hovering over tree items. It currently displays the error
* message for the lint warning associated with each node, if any (and only if the hover
* is over the icon portion).
*/
LintTooltipManager(LayoutCanvas canvas) {
mCanvas = canvas;
}
void register() {
mCanvas.addListener(SWT.Dispose, this);
mCanvas.addListener(SWT.KeyDown, this);
mCanvas.addListener(SWT.MouseMove, this);
mCanvas.addListener(SWT.MouseHover, this);
}
void unregister() {
if (!mCanvas.isDisposed()) {
mCanvas.removeListener(SWT.Dispose, this);
mCanvas.removeListener(SWT.KeyDown, this);
mCanvas.removeListener(SWT.MouseMove, this);
mCanvas.removeListener(SWT.MouseHover, this);
}
}
@Override
public void handleEvent(Event event) {
switch(event.type) {
case SWT.MouseMove:
// See if we're still overlapping this or *other* errors; if so, keep the
// tip up (or update it).
if (mShowingNodes != null) {
List<UiViewElementNode> nodes = computeNodes(event);
if (nodes != null && !nodes.isEmpty()) {
if (nodes.equals(mShowingNodes)) {
return;
} else {
show(nodes);
}
break;
}
}
// If not, fall through and hide the tooltip
//$FALL-THROUGH$
case SWT.Dispose:
case SWT.FocusOut:
case SWT.KeyDown:
case SWT.MouseExit:
case SWT.MouseDown:
hide();
break;
case SWT.MouseHover:
hide();
show(event);
break;
}
}
void hide() {
if (mTip != null) {
mTip.dispose();
mTip = null;
}
mShowingNodes = null;
}
private void show(Event event) {
List<UiViewElementNode> nodes = computeNodes(event);
if (nodes != null && !nodes.isEmpty()) {
show(nodes);
}
}
/** Show a tooltip listing the lint errors for the given nodes */
private void show(List<UiViewElementNode> nodes) {
hide();
if (!AdtPrefs.getPrefs().isLintOnSave()) {
return;
}
mTip = new LintTooltip(mCanvas, nodes);
Rectangle rect = mCanvas.getBounds();
Point size = mTip.computeSize(SWT.DEFAULT, SWT.DEFAULT);
Point pos = mCanvas.toDisplay(rect.x, rect.y + rect.height);
if (size.x > rect.width) {
size = mTip.computeSize(rect.width, SWT.DEFAULT);
}
mTip.setBounds(pos.x, pos.y, size.x, size.y);
mShowingNodes = nodes;
mTip.setVisible(true);
}
/**
* Compute the list of nodes which have lint warnings near the given mouse
* coordinates
*
* @param event the mouse cursor event
* @return a list of nodes, possibly empty
*/
@Nullable
private List<UiViewElementNode> computeNodes(Event event) {
LayoutPoint p = ControlPoint.create(mCanvas, event.x, event.y).toLayout();
LayoutEditorDelegate delegate = mCanvas.getEditorDelegate();
ViewHierarchy viewHierarchy = mCanvas.getViewHierarchy();
CanvasTransform mHScale = mCanvas.getHorizontalTransform();
CanvasTransform mVScale = mCanvas.getVerticalTransform();
int layoutIconSize = mHScale.inverseScale(ICON_SIZE);
int slop = mVScale.inverseScale(10); // extra space around icon where tip triggers
Collection<Node> xmlNodes = delegate.getLintNodes();
if (xmlNodes == null) {
return null;
}
List<UiViewElementNode> nodes = new ArrayList<UiViewElementNode>();
for (Node xmlNode : xmlNodes) {
CanvasViewInfo v = viewHierarchy.findViewInfoFor(xmlNode);
if (v != null) {
Rectangle b = v.getAbsRect();
int x2 = b.x + b.width;
int y2 = b.y + b.height;
if (p.x < x2 - layoutIconSize - slop
|| p.x > x2 + slop
|| p.y < y2 - layoutIconSize - slop
|| p.y > y2 + slop) {
continue;
}
nodes.add(v.getUiViewNode());
}
}
return nodes;
}
}
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