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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">widgetry::tools</span>::{<span class="ident">open_browser</span>, <span class="ident">PopupMsg</span>, <span class="ident">URLManager</span>};
<span class="kw">use</span> <span class="ident">widgetry</span>::{
    <span class="ident">EventCtx</span>, <span class="ident">Image</span>, <span class="ident">Key</span>, <span class="ident">Line</span>, <span class="ident">Panel</span>, <span class="ident">RewriteColor</span>, <span class="ident">SimpleState</span>, <span class="ident">State</span>, <span class="ident">Transition</span>, <span class="ident">Widget</span>,
};

<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::AppLike</span>;

<span class="doccomment">/// A title screen shared among all of the A/B Street apps.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TitleScreen</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">AppLike</span> <span class="op">+</span> <span class="lifetime">&#39;static</span><span class="op">&gt;</span> {
    <span class="ident">current_exe</span>: <span class="ident">Executable</span>,
    <span class="ident">enter_state</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span>) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Executable</span> {
    <span class="ident">ABStreet</span>,
    <span class="ident">FifteenMin</span>,
    <span class="ident">OSMViewer</span>,
    <span class="ident">ParkingMapper</span>,
    <span class="ident">Santa</span>,
    <span class="ident">RawMapEditor</span>,
    <span class="ident">LTN</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">AppLike</span> <span class="op">+</span> <span class="lifetime">&#39;static</span><span class="op">&gt;</span> <span class="ident">TitleScreen</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_state</span>(
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
        <span class="ident">current_exe</span>: <span class="ident">Executable</span>,
        <span class="ident">enter_state</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>, <span class="kw-2">&amp;mut</span> <span class="ident">A</span>, <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span>) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    ) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">State</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">panel</span> <span class="op">=</span> <span class="ident">Panel::new_builder</span>(<span class="ident">Widget::col</span>(<span class="macro">vec!</span>[
            <span class="ident">Image::from_path</span>(<span class="string">&quot;system/assets/pregame/logo.svg&quot;</span>)
                .<span class="ident">untinted</span>()
                .<span class="ident">dims</span>(<span class="number">150.0</span>)
                .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
            <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                <span class="ident">Widget::col</span>(<span class="macro">vec!</span>[
                    <span class="ident">Line</span>(<span class="string">&quot;Games&quot;</span>).<span class="ident">small_heading</span>().<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                    <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                        <span class="ident">Image::from_path</span>(<span class="string">&quot;system/assets/pregame/tutorial.svg&quot;</span>)
                            .<span class="ident">untinted</span>()
                            .<span class="ident">dims</span>(<span class="number">100.0</span>)
                            .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                        <span class="ident">ctx</span>.<span class="ident">style</span>()
                            .<span class="ident">btn_outline</span>
                            .<span class="ident">text</span>(<span class="string">&quot;Traffic simulation tutorial&quot;</span>)
                            .<span class="ident">hotkey</span>(<span class="ident">Key::T</span>)
                            .<span class="ident">tooltip</span>(<span class="string">&quot;Learn the basic controls&quot;</span>)
                            .<span class="ident">build_def</span>(<span class="ident">ctx</span>)
                            .<span class="ident">centered_vert</span>(),
                    ]),
                    <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                        <span class="ident">Image::from_path</span>(<span class="string">&quot;system/assets/pregame/challenges.svg&quot;</span>)
                            .<span class="ident">untinted</span>()
                            .<span class="ident">dims</span>(<span class="number">100.0</span>)
                            .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                        <span class="ident">ctx</span>.<span class="ident">style</span>()
                            .<span class="ident">btn_outline</span>
                            .<span class="ident">text</span>(<span class="string">&quot;Traffic simulation challenges&quot;</span>)
                            .<span class="ident">tooltip</span>(<span class="string">&quot;Complete specific objectives in the traffic simulator&quot;</span>)
                            .<span class="ident">build_def</span>(<span class="ident">ctx</span>)
                            .<span class="ident">centered_vert</span>(),
                    ]),
                    <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                        <span class="ident">Image::from_path</span>(<span class="string">&quot;system/assets/santa/bike1.svg&quot;</span>)
                            .<span class="ident">untinted</span>()
                            .<span class="ident">dims</span>(<span class="number">100.0</span>)
                            .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                        <span class="ident">ctx</span>.<span class="ident">style</span>()
                            .<span class="ident">btn_outline</span>
                            .<span class="ident">text</span>(<span class="string">&quot;15-minute Santa&quot;</span>)
                            .<span class="ident">tooltip</span>(<span class="string">&quot;Deliver presents as efficiently as possible&quot;</span>)
                            .<span class="ident">build_def</span>(<span class="ident">ctx</span>)
                            .<span class="ident">centered_vert</span>(),
                    ]),
                ])
                .<span class="ident">section</span>(<span class="ident">ctx</span>),
                <span class="ident">Widget::col</span>(<span class="macro">vec!</span>[
                    <span class="ident">Line</span>(<span class="string">&quot;Planning&quot;</span>).<span class="ident">small_heading</span>().<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                    <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                        <span class="ident">Image::from_path</span>(<span class="string">&quot;system/assets/pregame/sandbox.svg&quot;</span>)
                            .<span class="ident">untinted</span>()
                            .<span class="ident">dims</span>(<span class="number">100.0</span>)
                            .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                        <span class="ident">ctx</span>.<span class="ident">style</span>()
                            .<span class="ident">btn_outline</span>
                            .<span class="ident">text</span>(<span class="string">&quot;Traffic simulation sandbox&quot;</span>)
                            .<span class="ident">hotkey</span>(<span class="ident">Key::S</span>)
                            .<span class="ident">tooltip</span>(<span class="string">&quot;Simulate traffic, edit streets, measure effects&quot;</span>)
                            .<span class="ident">build_def</span>(<span class="ident">ctx</span>)
                            .<span class="ident">centered_vert</span>(),
                    ]),
                    <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                        <span class="ident">Image::from_path</span>(<span class="string">&quot;system/assets/edit/bike.svg&quot;</span>)
                            .<span class="ident">color</span>(<span class="ident">RewriteColor::ChangeAll</span>(<span class="ident">app</span>.<span class="ident">cs</span>().<span class="ident">bike_trip</span>))
                            .<span class="ident">dims</span>(<span class="number">100.0</span>)
                            .<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                        <span class="ident">ctx</span>.<span class="ident">style</span>()
                            .<span class="ident">btn_outline</span>
                            .<span class="ident">text</span>(<span class="string">&quot;Ungap the Map&quot;</span>)
                            .<span class="ident">tooltip</span>(<span class="string">&quot;Improve a city&#39;s bike network&quot;</span>)
                            .<span class="ident">build_def</span>(<span class="ident">ctx</span>)
                            .<span class="ident">centered_vert</span>(),
                    ]),
                    <span class="ident">ctx</span>.<span class="ident">style</span>()
                        .<span class="ident">btn_outline</span>
                        .<span class="ident">text</span>(<span class="string">&quot;15-minute neighborhoods&quot;</span>)
                        .<span class="ident">tooltip</span>(<span class="string">&quot;Explore what places residents can easily reach&quot;</span>)
                        .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>()
                        .<span class="ident">btn_outline</span>
                        .<span class="ident">text</span>(<span class="string">&quot;Low traffic neighborhoods&quot;</span>)
                        .<span class="ident">tooltip</span>(<span class="string">&quot;Reduce vehicle shortcuts through residential streets&quot;</span>)
                        .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>()
                        .<span class="ident">btn_outline</span>
                        .<span class="ident">text</span>(<span class="string">&quot;ActDev&quot;</span>)
                        .<span class="ident">tooltip</span>(<span class="string">&quot;Explore mobility patterns around new residential development&quot;</span>)
                        .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                ])
                .<span class="ident">section</span>(<span class="ident">ctx</span>),
                <span class="ident">Widget::col</span>(<span class="macro">vec!</span>[
                    <span class="ident">Line</span>(<span class="string">&quot;Other&quot;</span>).<span class="ident">small_heading</span>().<span class="ident">into_widget</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>()
                        .<span class="ident">btn_outline</span>
                        .<span class="ident">text</span>(<span class="string">&quot;Community proposals&quot;</span>)
                        .<span class="ident">tooltip</span>(<span class="string">&quot;Try out proposals for changing different cities&quot;</span>)
                        .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>()
                        .<span class="ident">btn_outline</span>
                        .<span class="ident">text</span>(<span class="string">&quot;Advanced tools&quot;</span>)
                        .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                    <span class="ident">ctx</span>.<span class="ident">style</span>().<span class="ident">btn_outline</span>.<span class="ident">text</span>(<span class="string">&quot;About&quot;</span>).<span class="ident">build_def</span>(<span class="ident">ctx</span>),
                ])
                .<span class="ident">section</span>(<span class="ident">ctx</span>),
            ]),
            <span class="ident">Widget::col</span>(<span class="macro">vec!</span>[
                <span class="ident">ctx</span>.<span class="ident">style</span>()
                    .<span class="ident">btn_outline</span>
                    .<span class="ident">text</span>(<span class="string">&quot;Created by Dustin Carlino, Yuwen Li, &amp; Michael Kirk&quot;</span>)
                    .<span class="ident">build_widget</span>(<span class="ident">ctx</span>, <span class="string">&quot;Credits&quot;</span>),
                <span class="ident">built_info::maybe_update</span>(<span class="ident">ctx</span>),
            ])
            .<span class="ident">centered_horiz</span>()
            .<span class="ident">align_bottom</span>(),
        ]))
        .<span class="ident">build</span>(<span class="ident">ctx</span>);
        <span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">SimpleState</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="ident">::new_state</span>(
            <span class="ident">panel</span>,
            <span class="ident">Box::new</span>(<span class="ident">TitleScreen</span> {
                <span class="ident">current_exe</span>,
                <span class="ident">enter_state</span>,
            }),
        )
    }

    <span class="kw">fn</span> <span class="ident">run</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">app</span>: <span class="kw-2">&amp;mut</span> <span class="ident">A</span>,
        <span class="ident">exe</span>: <span class="ident">Executable</span>,
        <span class="ident">args</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span>,
    ) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="ident">exe</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">current_exe</span> {
            <span class="ident">Transition::Push</span>((<span class="self">self</span>.<span class="ident">enter_state</span>)(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">args</span>))
        } <span class="kw">else</span> {
            <span class="ident">exe</span>.<span class="ident">replace_process</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">args</span>);
            <span class="comment">// On most platforms, this is unreachable. But on Windows, just keep the current app</span>
            <span class="comment">// open.</span>
            <span class="ident">Transition::Keep</span>
        }
    }
}

<span class="kw">impl</span> <span class="ident">Executable</span> {
    <span class="doccomment">/// Run the given executable with some arguments. On Mac and Linux, this replaces the current</span>
    <span class="doccomment">/// process. On Windows, this launches a new child process and leaves the current alone. On</span>
    <span class="doccomment">/// web, this makes the browser go to a new page.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace_process</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">AppLike</span> <span class="op">+</span> <span class="lifetime">&#39;static</span><span class="op">&gt;</span>(
        <span class="self">self</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">app</span>: <span class="kw-2">&amp;</span><span class="ident">A</span>,
        <span class="ident">args</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span>,
    ) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">args</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">args</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">a</span><span class="op">|</span> <span class="ident">a</span>.<span class="ident">to_string</span>()).<span class="ident">collect</span>();
        <span class="comment">// Usually pass in the current map&#39;s path</span>
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">Executable::Santa</span> =&gt; {}
            <span class="ident">Executable::RawMapEditor</span> =&gt; {
                <span class="ident">args</span>.<span class="ident">push</span>(<span class="ident">abstio::path_raw_map</span>(<span class="ident">app</span>.<span class="ident">map</span>().<span class="ident">get_name</span>()));
                <span class="ident">args</span>.<span class="ident">push</span>(<span class="macro">format!</span>(
                    <span class="string">&quot;--cam={}&quot;</span>,
                    <span class="ident">URLManager::get_cam_param</span>(<span class="ident">ctx</span>, <span class="ident">app</span>.<span class="ident">map</span>().<span class="ident">get_gps_bounds</span>())
                ));
            }
            <span class="kw">_</span> =&gt; {
                <span class="ident">args</span>.<span class="ident">push</span>(<span class="ident">app</span>.<span class="ident">map</span>().<span class="ident">get_name</span>().<span class="ident">path</span>());
            }
        }

        <span class="comment">// On native, end the current process and start another.</span>
        <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
        {
            <span class="kw">use</span> <span class="ident">std::process::Command</span>;

            <span class="comment">// TODO find_exe panics; should return error instead</span>
            <span class="kw">let</span> <span class="ident">binary</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::tools::find_exe</span>(<span class="kw">match</span> <span class="self">self</span> {
                <span class="ident">Executable::ABStreet</span> =&gt; <span class="string">&quot;game&quot;</span>,
                <span class="ident">Executable::FifteenMin</span> =&gt; <span class="string">&quot;fifteen_min&quot;</span>,
                <span class="ident">Executable::OSMViewer</span> =&gt; <span class="string">&quot;osm_viewer&quot;</span>,
                <span class="ident">Executable::ParkingMapper</span> =&gt; <span class="string">&quot;parking_mapper&quot;</span>,
                <span class="ident">Executable::Santa</span> =&gt; <span class="string">&quot;santa&quot;</span>,
                <span class="ident">Executable::RawMapEditor</span> =&gt; <span class="string">&quot;map_editor&quot;</span>,
                <span class="ident">Executable::LTN</span> =&gt; <span class="string">&quot;ltn&quot;</span>,
            });

            <span class="comment">// We can only replace the current process on Linux/Mac</span>
            <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">windows</span>))]</span>
            {
                <span class="kw">use</span> <span class="ident">std::os::unix::process::CommandExt</span>;
                <span class="kw">let</span> <span class="ident">err</span> <span class="op">=</span> <span class="ident">Command::new</span>(<span class="ident">binary</span>).<span class="ident">args</span>(<span class="ident">args</span>).<span class="ident">exec</span>();
                <span class="comment">// We only get here if something broke</span>
                <span class="ident">Transition::Push</span>(<span class="ident">PopupMsg::new_state</span>(<span class="ident">ctx</span>, <span class="string">&quot;Error&quot;</span>, <span class="macro">vec!</span>[<span class="ident">err</span>.<span class="ident">to_string</span>()]))
            }

            <span class="comment">// On Windows, all we can do is open a new child process. Not sure how to end the</span>
            <span class="comment">// current or detach.</span>
            <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">windows</span>)]</span>
            {
                <span class="ident">abstutil::must_run_cmd</span>(<span class="ident">Command::new</span>(<span class="ident">binary</span>).<span class="ident">args</span>(<span class="ident">args</span>));
                <span class="ident">Transition::Keep</span>
            }
        }

        <span class="comment">// On web, leave the current page and go to another.</span>
        <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
        {
            <span class="kw">fn</span> <span class="ident">set_href</span>(<span class="ident">url</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="ident">anyhow::Result</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
                <span class="kw">let</span> <span class="ident">window</span> <span class="op">=</span> <span class="ident">web_sys::window</span>().<span class="ident">ok_or</span>(<span class="macro">anyhow!</span>(<span class="string">&quot;no window?&quot;</span>))<span class="question-mark">?</span>;
                <span class="ident">window</span>.<span class="ident">location</span>().<span class="ident">set_href</span>(<span class="ident">url</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> {
                    <span class="macro">anyhow!</span>(<span class="ident">err</span>
                        .<span class="ident">as_string</span>()
                        .<span class="ident">unwrap_or</span>(<span class="string">&quot;window.location.set_href failed&quot;</span>.<span class="ident">to_string</span>()))
                })
            }

            <span class="kw">let</span> <span class="ident">page</span> <span class="op">=</span> <span class="kw">match</span> <span class="self">self</span> {
                <span class="ident">Executable::ABStreet</span> =&gt; <span class="string">&quot;abstreet&quot;</span>,
                <span class="ident">Executable::FifteenMin</span> =&gt; <span class="string">&quot;fifteen_min&quot;</span>,
                <span class="ident">Executable::OSMViewer</span> =&gt; <span class="string">&quot;osm_viewer&quot;</span>,
                <span class="comment">// This only works on native</span>
                <span class="ident">Executable::ParkingMapper</span> =&gt; <span class="macro">unreachable!</span>(),
                <span class="ident">Executable::Santa</span> =&gt; <span class="string">&quot;santa&quot;</span>,
                <span class="ident">Executable::RawMapEditor</span> =&gt; <span class="string">&quot;map_editor&quot;</span>,
                <span class="ident">Executable::LTN</span> =&gt; <span class="string">&quot;ltn&quot;</span>,
            };
            <span class="kw">let</span> <span class="ident">url</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">&quot;{}.html{}&quot;</span>, <span class="ident">page</span>, <span class="ident">abstutil::args_to_query_string</span>(<span class="ident">args</span>));
            <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">err</span>) <span class="op">=</span> <span class="ident">set_href</span>(<span class="kw-2">&amp;</span><span class="ident">url</span>) {
                <span class="kw">return</span> <span class="ident">Transition::Push</span>(<span class="ident">PopupMsg::new_state</span>(
                    <span class="ident">ctx</span>,
                    <span class="string">&quot;Error&quot;</span>,
                    <span class="macro">vec!</span>[<span class="macro">format!</span>(<span class="string">&quot;Couldn&#39;t redirect to {}: {}&quot;</span>, <span class="ident">url</span>, <span class="ident">err</span>)],
                ));
            }
            <span class="ident">Transition::Keep</span>
        }
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">A</span>: <span class="ident">AppLike</span> <span class="op">+</span> <span class="lifetime">&#39;static</span><span class="op">&gt;</span> <span class="ident">SimpleState</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">TitleScreen</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">on_click</span>(
        <span class="kw-2">&amp;mut</span> <span class="self">self</span>,
        <span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>,
        <span class="ident">app</span>: <span class="kw-2">&amp;mut</span> <span class="ident">A</span>,
        <span class="ident">x</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>,
        <span class="kw">_</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Panel</span>,
    ) -&gt; <span class="ident">Transition</span><span class="op">&lt;</span><span class="ident">A</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="ident">x</span> {
            <span class="string">&quot;Traffic simulation tutorial&quot;</span> =&gt; {
                <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::ABStreet</span>, <span class="macro">vec!</span>[<span class="string">&quot;--tutorial-intro&quot;</span>])
            }
            <span class="string">&quot;Traffic simulation challenges&quot;</span> =&gt; {
                <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::ABStreet</span>, <span class="macro">vec!</span>[<span class="string">&quot;--challenges&quot;</span>])
            }
            <span class="string">&quot;15-minute Santa&quot;</span> =&gt; <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::Santa</span>, <span class="macro">vec!</span>[]),
            <span class="string">&quot;Traffic simulation sandbox&quot;</span> =&gt; {
                <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::ABStreet</span>, <span class="macro">vec!</span>[<span class="string">&quot;--sandbox&quot;</span>])
            }
            <span class="string">&quot;Community proposals&quot;</span> =&gt; <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::ABStreet</span>, <span class="macro">vec!</span>[<span class="string">&quot;--proposals&quot;</span>]),
            <span class="string">&quot;Ungap the Map&quot;</span> =&gt; <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::ABStreet</span>, <span class="macro">vec!</span>[<span class="string">&quot;--ungap&quot;</span>]),
            <span class="string">&quot;15-minute neighborhoods&quot;</span> =&gt; <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::FifteenMin</span>, <span class="macro">vec!</span>[]),
            <span class="string">&quot;Low traffic neighborhoods&quot;</span> =&gt; <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::LTN</span>, <span class="macro">vec!</span>[]),
            <span class="string">&quot;ActDev&quot;</span> =&gt; {
                <span class="ident">open_browser</span>(<span class="string">&quot;https://actdev.cyipt.bike&quot;</span>);
                <span class="ident">Transition::Keep</span>
            }
            <span class="string">&quot;Advanced tools&quot;</span> =&gt; <span class="self">self</span>.<span class="ident">run</span>(<span class="ident">ctx</span>, <span class="ident">app</span>, <span class="ident">Executable::ABStreet</span>, <span class="macro">vec!</span>[<span class="string">&quot;--devtools&quot;</span>]),
            <span class="string">&quot;About&quot;</span> =&gt; <span class="ident">Transition::Push</span>(<span class="ident">PopupMsg::new_state</span>(
                <span class="ident">ctx</span>,
                <span class="string">&quot;About A/B Street&quot;</span>,
                <span class="macro">vec!</span>[
                    <span class="string">&quot;Disclaimer: This software is based on imperfect data, heuristics concocted&quot;</span>,
                    <span class="string">&quot;under the influence of cold brew, a simplified traffic simulation model,&quot;</span>,
                    <span class="string">&quot;and a deeply flawed understanding of how much articulated buses can bend&quot;</span>,
                    <span class="string">&quot;around tight corners. Use this as a conversation starter with your city&quot;</span>,
                    <span class="string">&quot;government, not a final decision maker. Any resemblance of in-game&quot;</span>,
                    <span class="string">&quot;characters to real people is probably coincidental, unless of course you&quot;</span>,
                    <span class="string">&quot;stumble across the elusive \&quot;Dustin Bikelino\&quot;. Have the appropriate&quot;</span>,
                    <span class="string">&quot;amount of fun.&quot;</span>,
                ],
            )),
            <span class="string">&quot;Credits&quot;</span> =&gt; {
                <span class="ident">open_browser</span>(<span class="string">&quot;https://a-b-street.github.io/docs/project/team.html&quot;</span>);
                <span class="ident">Transition::Keep</span>
            }
            <span class="string">&quot;Download the new release&quot;</span> =&gt; {
                <span class="ident">open_browser</span>(<span class="string">&quot;https://github.com/a-b-street/abstreet/releases&quot;</span>);
                <span class="ident">Transition::Keep</span>
            }
            <span class="kw">_</span> =&gt; <span class="macro">unreachable!</span>(),
        }
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>, <span class="ident">clippy::logic_bug</span>)]</span>
<span class="kw">mod</span> <span class="ident">built_info</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;

    <span class="macro">include!</span>(<span class="macro">concat!</span>(<span class="macro">env!</span>(<span class="string">&quot;OUT_DIR&quot;</span>), <span class="string">&quot;/built.rs&quot;</span>));

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">maybe_update</span>(<span class="ident">ctx</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>) -&gt; <span class="ident">Widget</span> {
        <span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">built::util::strptime</span>(<span class="ident">BUILT_TIME_UTC</span>);

        <span class="kw">let</span> <span class="ident">txt</span> <span class="op">=</span> <span class="ident">widgetry::Text::from</span>(<span class="macro">format!</span>(<span class="string">&quot;This version built on {}&quot;</span>, <span class="ident">t</span>.<span class="ident">date</span>().<span class="ident">naive_local</span>()))
            .<span class="ident">into_widget</span>(<span class="ident">ctx</span>);
        <span class="comment">// Disable this warning; no promise about a release schedule anymore</span>
        <span class="kw">if</span> <span class="bool-val">false</span> <span class="op">&amp;&amp;</span> (<span class="ident">chrono::Utc::now</span>() <span class="op">-</span> <span class="ident">t</span>).<span class="ident">num_days</span>() <span class="op">&gt;</span> <span class="number">15</span> {
            <span class="ident">Widget::row</span>(<span class="macro">vec!</span>[
                <span class="ident">txt</span>.<span class="ident">centered_vert</span>(),
                <span class="ident">ctx</span>.<span class="ident">style</span>()
                    .<span class="ident">btn_outline</span>
                    .<span class="ident">text</span>(<span class="string">&quot;Download the new release&quot;</span>)
                    .<span class="ident">build_def</span>(<span class="ident">ctx</span>),
            ])
        } <span class="kw">else</span> {
            <span class="ident">txt</span>
        }
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span>
<span class="kw">mod</span> <span class="ident">built_info</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">maybe_update</span>(<span class="kw">_</span>: <span class="kw-2">&amp;mut</span> <span class="ident">EventCtx</span>) -&gt; <span class="ident">Widget</span> {
        <span class="ident">Widget::nothing</span>()
    }
}
</code></pre></div>
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