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Allow custom placeholder image and use transparent_image for default #37

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Merged
johnpryan merged 1 commit into from
May 11, 2018
Merged

Allow custom placeholder image and use transparent_image for default #37

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9 changes: 6 additions & 3 deletions flutter_map/lib/src/layer/tile_layer.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:latlong/latlong.dart';
import 'package:transparent_image/transparent_image.dart';
import 'package:flutter_map/src/core/bounds.dart';
import 'package:flutter_map/src/core/point.dart';
import 'package:flutter_map/src/map/map.dart';
Expand All @@ -19,6 +20,7 @@ class TileLayerOptions extends LayerOptions {
final double zoomOffset;
final List<String> subdomains;
final Color backgroundColor;
ImageProvider placeholderImage;
Map<String, String> additionalOptions;

TileLayerOptions({
Expand All @@ -30,6 +32,7 @@ class TileLayerOptions extends LayerOptions {
this.additionalOptions = const <String, String>{},
this.subdomains = const <String>[],
this.backgroundColor = Colors.grey[300],
this.placeholderImage,
});
}

Expand Down Expand Up @@ -324,7 +327,6 @@ class _TileLayerState extends State<TileLayer> {
var pos = (tilePos).multiplyBy(level.scale) + level.translatePoint;
var width = tileSize.x * level.scale;
var height = tileSize.y * level.scale;
var blankImageBytes = new Uint8List(0);

return new Positioned(
left: pos.x.toDouble(),
Expand All @@ -335,8 +337,9 @@ class _TileLayerState extends State<TileLayer> {
child: new FadeInImage(
fadeInDuration: const Duration(milliseconds: 100),
key: new Key(_tileCoordsToKey(coords)),
// here `bytes` is a Uint8List containing the bytes for the in-memory image
placeholder: new MemoryImage(blankImageBytes),
placeholder: options.placeholderImage != null
? options.placeholderImage
: new MemoryImage(kTransparentImage),
image: new NetworkImage(getTileUrl(coords)),
fit: BoxFit.fill,
),
Expand Down
1 change: 1 addition & 0 deletions flutter_map/pubspec.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,3 +14,4 @@ dependencies:
latlong: ^0.4.0
tuple: ^1.0.0
quiver: ^0.28.0
transparent_image: ^0.1.0