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// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// 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.google.gerrit.client.diff;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Timer;
import java.util.PriorityQueue;
import net.codemirror.lib.CodeMirror;
/**
* LineWidget attached to a CodeMirror container.
*
* <p>When a comment is placed on a line a CommentWidget is created on both sides. The group tracks
* all comment boxes on that same line, and also includes an empty padding element to keep
* subsequent lines vertically aligned.
*/
class SideBySideCommentGroup extends CommentGroup implements Comparable<SideBySideCommentGroup> {
static void pair(SideBySideCommentGroup a, SideBySideCommentGroup b) {
a.peers.add(b);
b.peers.add(a);
}
private final Element padding;
private final PriorityQueue<SideBySideCommentGroup> peers;
SideBySideCommentGroup(
SideBySideCommentManager manager, CodeMirror cm, DisplaySide side, int line) {
super(manager, cm, side, line);
padding = DOM.createDiv();
padding.setClassName(SideBySideTable.style.padding());
SideBySideChunkManager.focusOnClick(padding, cm.side());
getElement().appendChild(padding);
peers = new PriorityQueue<>();
}
SideBySideCommentGroup getPeer() {
return peers.peek();
}
@Override
void remove(DraftBox box) {
super.remove(box);
if (getBoxCount() == 0 && peers.size() == 1 && peers.peek().peers.size() > 1) {
SideBySideCommentGroup peer = peers.peek();
peer.peers.remove(this);
detach();
if (peer.getBoxCount() == 0
&& peer.peers.size() == 1
&& peer.peers.peek().getBoxCount() == 0) {
peer.detach();
} else {
peer.resize();
}
} else {
resize();
}
}
@Override
void init(DiffTable parent) {
if (getLineWidget() == null) {
attach(parent);
}
for (CommentGroup peer : peers) {
if (peer.getLineWidget() == null) {
peer.attach(parent);
}
}
}
@Override
void handleRedraw() {
getLineWidget()
.onRedraw(
() -> {
if (canComputeHeight() && peers.peek().canComputeHeight()) {
if (getResizeTimer() != null) {
getResizeTimer().cancel();
setResizeTimer(null);
}
adjustPadding(SideBySideCommentGroup.this, peers.peek());
} else if (getResizeTimer() == null) {
setResizeTimer(
new Timer() {
@Override
public void run() {
if (canComputeHeight() && peers.peek().canComputeHeight()) {
cancel();
setResizeTimer(null);
adjustPadding(SideBySideCommentGroup.this, peers.peek());
}
}
});
getResizeTimer().scheduleRepeating(5);
}
});
}
@Override
void resize() {
if (getLineWidget() != null) {
adjustPadding(this, peers.peek());
}
}
private int computeHeight() {
if (getComments().isVisible()) {
// Include margin-bottom: 5px from CSS class.
return getComments().getOffsetHeight() + 5;
}
return 0;
}
private static void adjustPadding(SideBySideCommentGroup a, SideBySideCommentGroup b) {
int apx = a.computeHeight();
int bpx = b.computeHeight();
for (SideBySideCommentGroup otherPeer : a.peers) {
if (otherPeer != b) {
bpx += otherPeer.computeHeight();
}
}
for (SideBySideCommentGroup otherPeer : b.peers) {
if (otherPeer != a) {
apx += otherPeer.computeHeight();
}
}
int h = Math.max(apx, bpx);
a.padding.getStyle().setHeight(Math.max(0, h - apx), Unit.PX);
b.padding.getStyle().setHeight(Math.max(0, h - bpx), Unit.PX);
a.getLineWidget().changed();
b.getLineWidget().changed();
a.updateSelection();
b.updateSelection();
}
@Override
public int compareTo(SideBySideCommentGroup o) {
if (side == o.side) {
return line - o.line;
}
throw new IllegalStateException("Cannot compare SideBySideCommentGroup with different sides");
}
}
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