annotations.dart
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/*
* Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
*
* 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.
*/
part of widget;
class Anchor extends SingleChildWidget {
Anchor({Widget child, @required this.name, this.description})
: assert(name != null),
super(child: child);
final String name;
final String description;
@override
void paint(Context context) {
super.paint(context);
paintChild(context);
final Matrix4 mat = context.canvas.getTransform();
final Vector3 lt = mat.transform3(Vector3(box.left, box.bottom, 0));
context.document.pdfNames.addDest(name, context.page, posY: lt.y);
if (description != null) {
final Vector3 rb = mat.transform3(Vector3(box.right, box.top, 0));
final PdfRect ibox = PdfRect.fromLTRB(lt.x, lt.y, rb.x, rb.y);
PdfAnnot.text(context.page, content: description, rect: ibox);
}
}
}
class _Annotation extends SingleChildWidget {
_Annotation({Widget child}) : super(child: child);
@override
void debugPaint(Context context) {
context.canvas
..setFillColor(PdfColors.pink)
..drawRect(box.x, box.y, box.width, box.height)
..fillPath();
}
@override
void paint(Context context) {
super.paint(context);
paintChild(context);
}
}
class Link extends _Annotation {
Link({@required Widget child, this.destination})
: assert(child != null),
super(child: child);
final String destination;
@override
void paint(Context context) {
super.paint(context);
if (destination != null) {
final Matrix4 mat = context.canvas.getTransform();
final Vector3 lt = mat.transform3(Vector3(box.left, box.bottom, 0));
final Vector3 rb = mat.transform3(Vector3(box.right, box.top, 0));
final PdfRect ibox = PdfRect.fromLTRB(lt.x, lt.y, rb.x, rb.y);
PdfAnnot.namedLink(
context.page,
rect: ibox,
dest: destination,
);
}
}
}
class UrlLink extends _Annotation {
UrlLink({@required Widget child, @required this.destination})
: assert(child != null),
assert(destination != null),
super(child: child);
final String destination;
@override
void paint(Context context) {
super.paint(context);
final Matrix4 mat = context.canvas.getTransform();
final Vector3 lt = mat.transform3(Vector3(box.left, box.bottom, 0));
final Vector3 rb = mat.transform3(Vector3(box.right, box.top, 0));
final PdfRect ibox = PdfRect.fromLTRB(lt.x, lt.y, rb.x, rb.y);
PdfAnnot.urlLink(
context.page,
rect: ibox,
dest: destination,
);
}
}