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在这篇文章中，我们将介绍如何使用gallery PreviewWidget在Scope Preview中显示多幅图片。更多关于PreviewWidget类型可以参阅API。
首先，我们来下载我们上一节课里讲到的scopetemplate例程：
git clone https://gitcafe.com/ubuntu/scopetemplates_video.git
为了能够显示多幅图片，我们对我们的程序做了如下的修改：
// add an array to show the gallary of it
sc::VariantArray arr;
for(const auto &datum : icons_) {
arr.push_back(Variant(datum.toStdString()));
}
r["array"] = sc::Variant(arr); Result result = PreviewQueryBase::result();
PreviewWidget listen("tracks", "audio");
{
VariantBuilder builder;
builder.add_tuple({
{"title", Variant("This is the song title")},
{"source", Variant(result["musicSource"].get_string().c_str())}
});
listen.add_attribute_value("tracks", builder.end());
}
PreviewWidget video("videos", "video");
video.add_attribute_value("source", Variant(result["videoSource"].get_string().c_str()));
video.add_attribute_value("screenshot", Variant(result["screenshot"].get_string().c_str()));
sc::PreviewWidget header_gal("gallery_header", "header");
header_gal.add_attribute_value("title", Variant("Gallery files are:"));
PreviewWidget gallery("gallerys", "gallery");
gallery.add_attribute_value("sources", Variant(result["array"]));
PreviewWidgetList widgets({ image, header, description });
if ( result["musicSource"].get_string().length() != 0 ) {
widgets.emplace_back(listen);
}
if( result["videoSource"].get_string().length() != 0 ) {
widgets.emplace_back(video);
}
if( result["array"].get_array().size() != 0 ) {
widgets.emplace_back(header_gal);
widgets.emplace_back(gallery);
}
reply->push( widgets );
PreviewWidget gallery("gallerys", "gallery");
gallery.add_attribute_value("sources", Variant(result["array"])); PreviewWidget gallery("gallerys", "gallery");
gallery.add_attribute_mapping("sources", "array");
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原文地址：http://blog.csdn.net/ubuntutouch/article/details/46606673
