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finish basic work of fit-content

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Jinhao
2017-02-25 02:49:57 +08:00
parent 4820aba1e2
commit 3e5c4133ce
9 changed files with 360 additions and 326 deletions
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26
source/gui/programming_interface.cpp
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@@ -1,7 +1,7 @@
/*
* Nana GUI Programming Interface Implementation
* Nana C++ Library(http://www.nanapro.org)
* Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
* Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
@@ -1439,5 +1439,29 @@ namespace API
{
restrict::wd_manager().set_safe_place(reinterpret_cast<basic_window*>(wd), std::move(fn));
}
optional<std::pair<size, size>> content_extent(window wd, unsigned limited_px, bool limit_width)
{
auto iwd = reinterpret_cast<basic_window*>(wd);
internal_scope_guard lock;
if (restrict::wd_manager().available(iwd) && iwd->annex.content_measurer)
{
paint::graphics* graph = &iwd->drawer.graphics;
paint::graphics temp_graph;
if (graph->empty())
{
temp_graph.make({ 1, 1 });
temp_graph.typeface(graph->typeface());
graph = &temp_graph;
}
auto extent = iwd->annex.content_measurer->measure(*graph, limited_px, limit_width);
if (extent)
return std::make_pair(extent.value(), extent.value() + iwd->annex.content_measurer->extension());
}
return{};
}
}//end namespace API
}//end namespace nana