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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">instant::Instant</span>;
<span class="kw">use</span> <span class="ident">winit::event</span>::{
    <span class="ident">ElementState</span>, <span class="ident">KeyboardInput</span>, <span class="ident">MouseButton</span>, <span class="ident">MouseScrollDelta</span>, <span class="ident">VirtualKeyCode</span>, <span class="ident">WindowEvent</span>,
};

<span class="kw">use</span> <span class="ident">geom::Duration</span>;

<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">EventCtx</span>, <span class="ident">Line</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">TextSpan</span>};

<span class="comment">// Mouse-up events longer than this will be considered single clicks</span>
<span class="comment">// Ideally the delay would be a little more tolerant - e.g. 500ms, but because we don&#39;t actually</span>
<span class="comment">// have a way to indicate that a single click was handled (and thus *shouldn&#39;t* be counted as part of a double click)</span>
<span class="comment">// it&#39;s too easy to have false positives.</span>
<span class="kw">const</span> <span class="ident">MAX_DOUBLE_CLICK_DURATION</span>: <span class="ident">instant::Duration</span> <span class="op">=</span> <span class="ident">instant::Duration::from_millis</span>(<span class="number">300</span>);

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</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">Event</span> {
    <span class="comment">// Used to initialize the application and also to recalculate menu state when some other event</span>
    <span class="comment">// is used.</span>
    <span class="ident">NoOp</span>,
    <span class="ident">LeftMouseButtonDown</span>,
    <span class="doccomment">/// Note: When double clicking, there will be two `LeftMouseButtonUp` events in short</span>
    <span class="doccomment">/// succession - first a `LeftMouseButtonUp { is_double_click: false }`, followed by</span>
    <span class="doccomment">/// a `LeftMouseButtonUp { is_double_click: true }`.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// This was done for ease of implementation - it allows a target to ignore single clicks and</span>
    <span class="doccomment">/// handle double clicks (or vice versa), but it precludes an obvious way to have a target</span>
    <span class="doccomment">/// handle single clicks one way while handling double clicks a different way.</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// e.g. a typical file browser highlights a file with a single click and opens the file with a</span>
    <span class="doccomment">/// double click, the way we&#39;ve implemented double clicks here wouldn&#39;t work well for that</span>
    <span class="doccomment">/// case.</span>
    <span class="ident">LeftMouseButtonUp</span> {
        <span class="ident">is_double_click</span>: <span class="ident">bool</span>,
    },
    <span class="ident">RightMouseButtonDown</span>,
    <span class="ident">RightMouseButtonUp</span>,
    <span class="comment">// TODO KeyDown and KeyUp might be nicer, but piston (and probably X.org) hands over repeated</span>
    <span class="comment">// events while a key is held down.</span>
    <span class="ident">KeyPress</span>(<span class="ident">Key</span>),
    <span class="ident">KeyRelease</span>(<span class="ident">Key</span>),
    <span class="comment">// Some real amount of time has passed since the last update</span>
    <span class="ident">Update</span>(<span class="ident">Duration</span>),
    <span class="ident">MouseMovedTo</span>(<span class="ident">ScreenPt</span>),
    <span class="ident">WindowLostCursor</span>,
    <span class="ident">WindowGainedCursor</span>,
    <span class="ident">MouseWheelScroll</span>(<span class="ident">f64</span>, <span class="ident">f64</span>),
    <span class="ident">WindowResized</span>(<span class="ident">ScreenDims</span>),
}

<span class="kw">impl</span> <span class="ident">Event</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">from_winit_event</span>(
        <span class="ident">ev</span>: <span class="ident">WindowEvent</span>,
        <span class="ident">scale_factor</span>: <span class="ident">f64</span>,
        <span class="ident">previous_click</span>: <span class="ident">Instant</span>,
    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Event</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="ident">ev</span> {
            <span class="ident">WindowEvent::MouseInput</span> { <span class="ident">state</span>, <span class="ident">button</span>, .. } =&gt; <span class="kw">match</span> (<span class="ident">button</span>, <span class="ident">state</span>) {
                (<span class="ident">MouseButton::Left</span>, <span class="ident">ElementState::Pressed</span>) =&gt; <span class="prelude-val">Some</span>(<span class="ident">Event::LeftMouseButtonDown</span>),
                (<span class="ident">MouseButton::Left</span>, <span class="ident">ElementState::Released</span>) =&gt; {
                    <span class="kw">let</span> <span class="ident">is_double_click</span> <span class="op">=</span> <span class="ident">previous_click</span>.<span class="ident">elapsed</span>().<span class="ident">le</span>(<span class="kw-2">&amp;</span><span class="ident">MAX_DOUBLE_CLICK_DURATION</span>);
                    <span class="prelude-val">Some</span>(<span class="ident">Event::LeftMouseButtonUp</span> { <span class="ident">is_double_click</span> })
                }
                (<span class="ident">MouseButton::Right</span>, <span class="ident">ElementState::Pressed</span>) =&gt; <span class="prelude-val">Some</span>(<span class="ident">Event::RightMouseButtonDown</span>),
                (<span class="ident">MouseButton::Right</span>, <span class="ident">ElementState::Released</span>) =&gt; <span class="prelude-val">Some</span>(<span class="ident">Event::RightMouseButtonUp</span>),
                <span class="kw">_</span> =&gt; <span class="prelude-val">None</span>,
            },
            <span class="ident">WindowEvent::KeyboardInput</span> { <span class="ident">input</span>, .. } =&gt; {
                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">key</span>) <span class="op">=</span> <span class="ident">Key::from_winit_key</span>(<span class="ident">input</span>) {
                    <span class="kw">if</span> <span class="ident">input</span>.<span class="ident">state</span> <span class="op">==</span> <span class="ident">ElementState::Pressed</span> {
                        <span class="prelude-val">Some</span>(<span class="ident">Event::KeyPress</span>(<span class="ident">key</span>))
                    } <span class="kw">else</span> {
                        <span class="prelude-val">Some</span>(<span class="ident">Event::KeyRelease</span>(<span class="ident">key</span>))
                    }
                } <span class="kw">else</span> {
                    <span class="prelude-val">None</span>
                }
            }
            <span class="ident">WindowEvent::CursorMoved</span> { <span class="ident">position</span>, .. } =&gt; <span class="prelude-val">Some</span>(<span class="ident">Event::MouseMovedTo</span>(
                <span class="ident">position</span>.<span class="ident">to_logical</span>(<span class="ident">scale_factor</span>).<span class="ident">into</span>(),
            )),
            <span class="ident">WindowEvent::MouseWheel</span> { <span class="ident">delta</span>, .. } =&gt; <span class="kw">match</span> <span class="ident">delta</span> {
                <span class="comment">// &quot;In the beginning&quot; a spinnable mouse wheel was the only input hardware for</span>
                <span class="comment">// scrolling. Each &quot;increment&quot; of the mouse wheel indicated that the application</span>
                <span class="comment">// should scroll one line of text.</span>
                <span class="comment">//</span>
                <span class="comment">// Since the advent of touchpads and tablets, much finer grained scrolling is used,</span>
                <span class="comment">// and consequently some input systems started expressing scroll distances from such</span>
                <span class="comment">// input devices in &quot;pixels&quot; rather than &quot;lines&quot;.</span>
                <span class="comment">//</span>
                <span class="comment">// However some backends (e.g. x11) will express all scrolling as `LineDelta` — on</span>
                <span class="comment">// those systems, touchpad drags will simply be scaled to some presumed equivalent</span>
                <span class="comment">// number of lines.</span>
                <span class="comment">//</span>
                <span class="comment">// Widgetry expresses all scrolling in terms of MouseWheelScroll, which uses</span>
                <span class="comment">// &quot;Lines&quot;.</span>
                <span class="comment">//</span>
                <span class="comment">// Anymore &quot;a line&quot; usually doesn&#39;t correspond to &quot;a literal line of text&quot; in the</span>
                <span class="comment">// application, and must usually just be considered an abstract unit of</span>
                <span class="comment">// measurement, because of things like configurable scroll sensitivity, variable</span>
                <span class="comment">// text size, and the aforementioned advent of touchpads.</span>
                <span class="comment">//</span>
                <span class="comment">// With &quot;Reverse&quot; scrolling, positive values indicate upward or rightward scrolling.</span>
                <span class="comment">// With &quot;Natural&quot; scrolling, it&#39;s the opposite.</span>
                <span class="ident">MouseScrollDelta::LineDelta</span>(<span class="ident">dx</span>, <span class="ident">dy</span>) =&gt; {
                    <span class="kw">if</span> <span class="ident">dx</span> <span class="op">==</span> <span class="number">0.0</span> <span class="op">&amp;&amp;</span> <span class="ident">dy</span> <span class="op">==</span> <span class="number">0.0</span> {
                        <span class="prelude-val">None</span>
                    } <span class="kw">else</span> {
                        <span class="prelude-val">Some</span>(<span class="ident">Event::MouseWheelScroll</span>(<span class="ident">f64::from</span>(<span class="ident">dx</span>), <span class="ident">f64::from</span>(<span class="ident">dy</span>)))
                    }
                }
                <span class="ident">MouseScrollDelta::PixelDelta</span>(<span class="ident">pos</span>) =&gt; {
                    <span class="comment">// Widgetry expresses all scroll activity in units of &quot;lines&quot;, so convert from</span>
                    <span class="comment">// a PixelDelta to a LineDelta.</span>

                    <span class="comment">// This scale factor is just a guess - but feels about right.</span>
                    <span class="kw">let</span> <span class="ident">scale_factor</span> <span class="op">=</span> <span class="number">0.01</span>;

                    <span class="prelude-val">Some</span>(<span class="ident">Event::MouseWheelScroll</span>(
                        <span class="ident">scale_factor</span> <span class="op">*</span> <span class="ident">pos</span>.<span class="ident">x</span>,
                        <span class="ident">scale_factor</span> <span class="op">*</span> <span class="ident">pos</span>.<span class="ident">y</span>,
                    ))
                }
            },
            <span class="ident">WindowEvent::Resized</span>(<span class="ident">size</span>) =&gt; {
                <span class="prelude-val">Some</span>(<span class="ident">Event::WindowResized</span>(<span class="ident">size</span>.<span class="ident">to_logical</span>(<span class="ident">scale_factor</span>).<span class="ident">into</span>()))
            }
            <span class="ident">WindowEvent::Focused</span>(<span class="ident">gained</span>) =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">gained</span> {
                <span class="ident">Event::WindowGainedCursor</span>
            } <span class="kw">else</span> {
                <span class="ident">Event::WindowLostCursor</span>
            }),
            <span class="kw">_</span> =&gt; <span class="prelude-val">None</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 class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Hash</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Key</span> {
    <span class="comment">// Case is unspecified.</span>
    <span class="comment">// TODO Would be cool to represent A and UpperA, but then release semantics get weird... hold</span>
    <span class="comment">// shift and A, release shift -- does that trigger a Release(UpperA) and a Press(A)?</span>
    <span class="ident">A</span>,
    <span class="ident">B</span>,
    <span class="ident">C</span>,
    <span class="ident">D</span>,
    <span class="ident">E</span>,
    <span class="ident">F</span>,
    <span class="ident">G</span>,
    <span class="ident">H</span>,
    <span class="ident">I</span>,
    <span class="ident">J</span>,
    <span class="ident">K</span>,
    <span class="ident">L</span>,
    <span class="ident">M</span>,
    <span class="ident">N</span>,
    <span class="ident">O</span>,
    <span class="ident">P</span>,
    <span class="ident">Q</span>,
    <span class="ident">R</span>,
    <span class="ident">S</span>,
    <span class="ident">T</span>,
    <span class="ident">U</span>,
    <span class="ident">V</span>,
    <span class="ident">W</span>,
    <span class="ident">X</span>,
    <span class="ident">Y</span>,
    <span class="ident">Z</span>,
    <span class="comment">// Numbers (not the numpad)</span>
    <span class="ident">Num1</span>,
    <span class="ident">Num2</span>,
    <span class="ident">Num3</span>,
    <span class="ident">Num4</span>,
    <span class="ident">Num5</span>,
    <span class="ident">Num6</span>,
    <span class="ident">Num7</span>,
    <span class="ident">Num8</span>,
    <span class="ident">Num9</span>,
    <span class="ident">Num0</span>,
    <span class="comment">// symbols</span>
    <span class="comment">// TODO shift+number keys</span>
    <span class="ident">LeftBracket</span>,
    <span class="ident">RightBracket</span>,
    <span class="ident">Space</span>,
    <span class="ident">Slash</span>,
    <span class="ident">Dot</span>,
    <span class="ident">Comma</span>,
    <span class="ident">Semicolon</span>,
    <span class="ident">Colon</span>,
    <span class="ident">Equals</span>,
    <span class="ident">SingleQuote</span>,
    <span class="comment">// Stuff without a straightforward single-character display</span>
    <span class="ident">Escape</span>,
    <span class="ident">Enter</span>,
    <span class="ident">Tab</span>,
    <span class="ident">Backspace</span>,
    <span class="ident">LeftShift</span>,
    <span class="ident">LeftControl</span>,
    <span class="ident">LeftAlt</span>,
    <span class="ident">RightAlt</span>,
    <span class="ident">LeftArrow</span>,
    <span class="ident">RightArrow</span>,
    <span class="ident">UpArrow</span>,
    <span class="ident">DownArrow</span>,
    <span class="ident">F1</span>,
    <span class="ident">F2</span>,
    <span class="ident">F3</span>,
    <span class="ident">F4</span>,
    <span class="ident">F5</span>,
    <span class="ident">F6</span>,
    <span class="ident">F7</span>,
    <span class="ident">F8</span>,
    <span class="ident">F9</span>,
    <span class="ident">F10</span>,
    <span class="ident">F11</span>,
    <span class="ident">F12</span>,
}

<span class="kw">impl</span> <span class="ident">Key</span> {
    <span class="kw">pub</span> <span class="kw">const</span> <span class="ident">NUM_KEYS</span>: [<span class="ident">Key</span>; <span class="number">9</span>] <span class="op">=</span> [
        <span class="ident">Key::Num1</span>,
        <span class="ident">Key::Num2</span>,
        <span class="ident">Key::Num3</span>,
        <span class="ident">Key::Num4</span>,
        <span class="ident">Key::Num5</span>,
        <span class="ident">Key::Num6</span>,
        <span class="ident">Key::Num7</span>,
        <span class="ident">Key::Num8</span>,
        <span class="ident">Key::Num9</span>,
    ];

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_char</span>(<span class="self">self</span>, <span class="ident">shift_pressed</span>: <span class="ident">bool</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">char</span><span class="op">&gt;</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">Key::A</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;A&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;a&#39;</span> }),
            <span class="ident">Key::B</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;B&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;b&#39;</span> }),
            <span class="ident">Key::C</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;C&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;c&#39;</span> }),
            <span class="ident">Key::D</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;D&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;d&#39;</span> }),
            <span class="ident">Key::E</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;E&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;e&#39;</span> }),
            <span class="ident">Key::F</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;F&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;f&#39;</span> }),
            <span class="ident">Key::G</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;G&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;g&#39;</span> }),
            <span class="ident">Key::H</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;H&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;h&#39;</span> }),
            <span class="ident">Key::I</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;I&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;i&#39;</span> }),
            <span class="ident">Key::J</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;J&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;j&#39;</span> }),
            <span class="ident">Key::K</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;K&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;k&#39;</span> }),
            <span class="ident">Key::L</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;L&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;l&#39;</span> }),
            <span class="ident">Key::M</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;M&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;m&#39;</span> }),
            <span class="ident">Key::N</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;N&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;n&#39;</span> }),
            <span class="ident">Key::O</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;O&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;o&#39;</span> }),
            <span class="ident">Key::P</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;P&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;p&#39;</span> }),
            <span class="ident">Key::Q</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;Q&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;q&#39;</span> }),
            <span class="ident">Key::R</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;R&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;r&#39;</span> }),
            <span class="ident">Key::S</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;S&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;s&#39;</span> }),
            <span class="ident">Key::T</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;T&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;t&#39;</span> }),
            <span class="ident">Key::U</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;U&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;u&#39;</span> }),
            <span class="ident">Key::V</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;V&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;v&#39;</span> }),
            <span class="ident">Key::W</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;W&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;w&#39;</span> }),
            <span class="ident">Key::X</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;X&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;x&#39;</span> }),
            <span class="ident">Key::Y</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;Y&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;y&#39;</span> }),
            <span class="ident">Key::Z</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;Z&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;z&#39;</span> }),
            <span class="ident">Key::Num1</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;!&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;1&#39;</span> }),
            <span class="ident">Key::Num2</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;@&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;2&#39;</span> }),
            <span class="ident">Key::Num3</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;#&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;3&#39;</span> }),
            <span class="ident">Key::Num4</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;$&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;4&#39;</span> }),
            <span class="ident">Key::Num5</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;%&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;5&#39;</span> }),
            <span class="ident">Key::Num6</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;^&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;6&#39;</span> }),
            <span class="ident">Key::Num7</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;&amp;&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;7&#39;</span> }),
            <span class="ident">Key::Num8</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;*&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;8&#39;</span> }),
            <span class="ident">Key::Num9</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;(&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;9&#39;</span> }),
            <span class="ident">Key::Num0</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;)&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;0&#39;</span> }),
            <span class="ident">Key::LeftBracket</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;{&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;[&#39;</span> }),
            <span class="ident">Key::RightBracket</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;}&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;]&#39;</span> }),
            <span class="ident">Key::Space</span> =&gt; <span class="prelude-val">Some</span>(<span class="string">&#39; &#39;</span>),
            <span class="ident">Key::Slash</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;?&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;/&#39;</span> }),
            <span class="ident">Key::Dot</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;&gt;&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;.&#39;</span> }),
            <span class="ident">Key::Comma</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;&lt;&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;,&#39;</span> }),
            <span class="ident">Key::Semicolon</span> =&gt; <span class="prelude-val">Some</span>(<span class="string">&#39;;&#39;</span>),
            <span class="ident">Key::Colon</span> =&gt; <span class="prelude-val">Some</span>(<span class="string">&#39;:&#39;</span>),
            <span class="ident">Key::Equals</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;+&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;=&#39;</span> }),
            <span class="ident">Key::SingleQuote</span> =&gt; <span class="prelude-val">Some</span>(<span class="kw">if</span> <span class="ident">shift_pressed</span> { <span class="string">&#39;&quot;&#39;</span> } <span class="kw">else</span> { <span class="string">&#39;\&#39;&#39;</span> }),
            <span class="ident">Key::Escape</span>
            <span class="op">|</span> <span class="ident">Key::Enter</span>
            <span class="op">|</span> <span class="ident">Key::Tab</span>
            <span class="op">|</span> <span class="ident">Key::Backspace</span>
            <span class="op">|</span> <span class="ident">Key::LeftShift</span>
            <span class="op">|</span> <span class="ident">Key::LeftControl</span>
            <span class="op">|</span> <span class="ident">Key::LeftAlt</span>
            <span class="op">|</span> <span class="ident">Key::RightAlt</span>
            <span class="op">|</span> <span class="ident">Key::LeftArrow</span>
            <span class="op">|</span> <span class="ident">Key::RightArrow</span>
            <span class="op">|</span> <span class="ident">Key::UpArrow</span>
            <span class="op">|</span> <span class="ident">Key::DownArrow</span>
            <span class="op">|</span> <span class="ident">Key::F1</span>
            <span class="op">|</span> <span class="ident">Key::F2</span>
            <span class="op">|</span> <span class="ident">Key::F3</span>
            <span class="op">|</span> <span class="ident">Key::F4</span>
            <span class="op">|</span> <span class="ident">Key::F5</span>
            <span class="op">|</span> <span class="ident">Key::F6</span>
            <span class="op">|</span> <span class="ident">Key::F7</span>
            <span class="op">|</span> <span class="ident">Key::F8</span>
            <span class="op">|</span> <span class="ident">Key::F9</span>
            <span class="op">|</span> <span class="ident">Key::F10</span>
            <span class="op">|</span> <span class="ident">Key::F11</span>
            <span class="op">|</span> <span class="ident">Key::F12</span> =&gt; <span class="prelude-val">None</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">describe</span>(<span class="self">self</span>) -&gt; <span class="ident">String</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">Key::Escape</span> =&gt; <span class="string">&quot;Escape&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::Enter</span> =&gt; <span class="string">&quot;Enter&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::Tab</span> =&gt; <span class="string">&quot;Tab&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::Backspace</span> =&gt; <span class="string">&quot;Backspace&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::LeftShift</span> =&gt; <span class="string">&quot;Shift&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::LeftControl</span> =&gt; <span class="string">&quot;left Control&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::LeftAlt</span> =&gt; <span class="string">&quot;left Alt&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::RightAlt</span> =&gt; <span class="string">&quot;right Alt&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::LeftArrow</span> =&gt; <span class="string">&quot;← arrow&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::RightArrow</span> =&gt; <span class="string">&quot;→ arrow&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::UpArrow</span> =&gt; <span class="string">&quot;↑&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::DownArrow</span> =&gt; <span class="string">&quot;↓&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F1</span> =&gt; <span class="string">&quot;F1&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F2</span> =&gt; <span class="string">&quot;F2&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F3</span> =&gt; <span class="string">&quot;F3&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F4</span> =&gt; <span class="string">&quot;F4&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F5</span> =&gt; <span class="string">&quot;F5&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F6</span> =&gt; <span class="string">&quot;F6&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F7</span> =&gt; <span class="string">&quot;F7&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F8</span> =&gt; <span class="string">&quot;F8&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F9</span> =&gt; <span class="string">&quot;F9&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F10</span> =&gt; <span class="string">&quot;F10&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F11</span> =&gt; <span class="string">&quot;F11&quot;</span>.<span class="ident">to_string</span>(),
            <span class="ident">Key::F12</span> =&gt; <span class="string">&quot;F12&quot;</span>.<span class="ident">to_string</span>(),
            <span class="comment">// These have to_char, but override here</span>
            <span class="ident">Key::Space</span> =&gt; <span class="string">&quot;Space&quot;</span>.<span class="ident">to_string</span>(),
            <span class="kw">_</span> =&gt; <span class="self">self</span>.<span class="ident">to_char</span>(<span class="bool-val">false</span>).<span class="ident">unwrap</span>().<span class="ident">to_string</span>(),
        }
    }

    <span class="kw">fn</span> <span class="ident">from_winit_key</span>(<span class="ident">input</span>: <span class="ident">KeyboardInput</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Key</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">virtual_keycode</span><span class="question-mark">?</span>;
        <span class="prelude-val">Some</span>(<span class="kw">match</span> <span class="ident">key</span> {
            <span class="ident">VirtualKeyCode::A</span> =&gt; <span class="ident">Key::A</span>,
            <span class="ident">VirtualKeyCode::B</span> =&gt; <span class="ident">Key::B</span>,
            <span class="ident">VirtualKeyCode::C</span> =&gt; <span class="ident">Key::C</span>,
            <span class="ident">VirtualKeyCode::D</span> =&gt; <span class="ident">Key::D</span>,
            <span class="ident">VirtualKeyCode::E</span> =&gt; <span class="ident">Key::E</span>,
            <span class="ident">VirtualKeyCode::F</span> =&gt; <span class="ident">Key::F</span>,
            <span class="ident">VirtualKeyCode::G</span> =&gt; <span class="ident">Key::G</span>,
            <span class="ident">VirtualKeyCode::H</span> =&gt; <span class="ident">Key::H</span>,
            <span class="ident">VirtualKeyCode::I</span> =&gt; <span class="ident">Key::I</span>,
            <span class="ident">VirtualKeyCode::J</span> =&gt; <span class="ident">Key::J</span>,
            <span class="ident">VirtualKeyCode::K</span> =&gt; <span class="ident">Key::K</span>,
            <span class="ident">VirtualKeyCode::L</span> =&gt; <span class="ident">Key::L</span>,
            <span class="ident">VirtualKeyCode::M</span> =&gt; <span class="ident">Key::M</span>,
            <span class="ident">VirtualKeyCode::N</span> =&gt; <span class="ident">Key::N</span>,
            <span class="ident">VirtualKeyCode::O</span> =&gt; <span class="ident">Key::O</span>,
            <span class="ident">VirtualKeyCode::P</span> =&gt; <span class="ident">Key::P</span>,
            <span class="ident">VirtualKeyCode::Q</span> =&gt; <span class="ident">Key::Q</span>,
            <span class="ident">VirtualKeyCode::R</span> =&gt; <span class="ident">Key::R</span>,
            <span class="ident">VirtualKeyCode::S</span> =&gt; <span class="ident">Key::S</span>,
            <span class="ident">VirtualKeyCode::T</span> =&gt; <span class="ident">Key::T</span>,
            <span class="ident">VirtualKeyCode::U</span> =&gt; <span class="ident">Key::U</span>,
            <span class="ident">VirtualKeyCode::V</span> =&gt; <span class="ident">Key::V</span>,
            <span class="ident">VirtualKeyCode::W</span> =&gt; <span class="ident">Key::W</span>,
            <span class="ident">VirtualKeyCode::X</span> =&gt; <span class="ident">Key::X</span>,
            <span class="ident">VirtualKeyCode::Y</span> =&gt; <span class="ident">Key::Y</span>,
            <span class="ident">VirtualKeyCode::Z</span> =&gt; <span class="ident">Key::Z</span>,
            <span class="ident">VirtualKeyCode::Key1</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad1</span> =&gt; <span class="ident">Key::Num1</span>,
            <span class="ident">VirtualKeyCode::Key2</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad2</span> =&gt; <span class="ident">Key::Num2</span>,
            <span class="ident">VirtualKeyCode::Key3</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad3</span> =&gt; <span class="ident">Key::Num3</span>,
            <span class="ident">VirtualKeyCode::Key4</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad4</span> =&gt; <span class="ident">Key::Num4</span>,
            <span class="ident">VirtualKeyCode::Key5</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad5</span> =&gt; <span class="ident">Key::Num5</span>,
            <span class="ident">VirtualKeyCode::Key6</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad6</span> =&gt; <span class="ident">Key::Num6</span>,
            <span class="ident">VirtualKeyCode::Key7</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad7</span> =&gt; <span class="ident">Key::Num7</span>,
            <span class="ident">VirtualKeyCode::Key8</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad8</span> =&gt; <span class="ident">Key::Num8</span>,
            <span class="ident">VirtualKeyCode::Key9</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad9</span> =&gt; <span class="ident">Key::Num9</span>,
            <span class="ident">VirtualKeyCode::Key0</span> <span class="op">|</span> <span class="ident">VirtualKeyCode::Numpad0</span> =&gt; <span class="ident">Key::Num0</span>,
            <span class="ident">VirtualKeyCode::LBracket</span> =&gt; <span class="ident">Key::LeftBracket</span>,
            <span class="ident">VirtualKeyCode::RBracket</span> =&gt; <span class="ident">Key::RightBracket</span>,
            <span class="ident">VirtualKeyCode::Space</span> =&gt; <span class="ident">Key::Space</span>,
            <span class="ident">VirtualKeyCode::Slash</span> =&gt; <span class="ident">Key::Slash</span>,
            <span class="ident">VirtualKeyCode::Period</span> =&gt; <span class="ident">Key::Dot</span>,
            <span class="ident">VirtualKeyCode::Comma</span> =&gt; <span class="ident">Key::Comma</span>,
            <span class="ident">VirtualKeyCode::Semicolon</span> =&gt; <span class="ident">Key::Semicolon</span>,
            <span class="ident">VirtualKeyCode::Colon</span> =&gt; <span class="ident">Key::Colon</span>,
            <span class="ident">VirtualKeyCode::Equals</span> =&gt; <span class="ident">Key::Equals</span>,
            <span class="ident">VirtualKeyCode::Apostrophe</span> =&gt; <span class="ident">Key::SingleQuote</span>,
            <span class="ident">VirtualKeyCode::Escape</span> =&gt; <span class="ident">Key::Escape</span>,
            <span class="ident">VirtualKeyCode::Return</span> =&gt; <span class="ident">Key::Enter</span>,
            <span class="ident">VirtualKeyCode::Tab</span> =&gt; <span class="ident">Key::Tab</span>,
            <span class="ident">VirtualKeyCode::Back</span> =&gt; <span class="ident">Key::Backspace</span>,
            <span class="ident">VirtualKeyCode::LShift</span> =&gt; <span class="ident">Key::LeftShift</span>,
            <span class="ident">VirtualKeyCode::LControl</span> =&gt; <span class="ident">Key::LeftControl</span>,
            <span class="ident">VirtualKeyCode::LAlt</span> =&gt; <span class="ident">Key::LeftAlt</span>,
            <span class="ident">VirtualKeyCode::RAlt</span> =&gt; <span class="ident">Key::RightAlt</span>,
            <span class="ident">VirtualKeyCode::Left</span> =&gt; <span class="ident">Key::LeftArrow</span>,
            <span class="ident">VirtualKeyCode::Right</span> =&gt; <span class="ident">Key::RightArrow</span>,
            <span class="ident">VirtualKeyCode::Up</span> =&gt; <span class="ident">Key::UpArrow</span>,
            <span class="ident">VirtualKeyCode::Down</span> =&gt; <span class="ident">Key::DownArrow</span>,
            <span class="ident">VirtualKeyCode::F1</span> =&gt; <span class="ident">Key::F1</span>,
            <span class="ident">VirtualKeyCode::F2</span> =&gt; <span class="ident">Key::F2</span>,
            <span class="ident">VirtualKeyCode::F3</span> =&gt; <span class="ident">Key::F3</span>,
            <span class="ident">VirtualKeyCode::F4</span> =&gt; <span class="ident">Key::F4</span>,
            <span class="ident">VirtualKeyCode::F5</span> =&gt; <span class="ident">Key::F5</span>,
            <span class="ident">VirtualKeyCode::F6</span> =&gt; <span class="ident">Key::F6</span>,
            <span class="ident">VirtualKeyCode::F7</span> =&gt; <span class="ident">Key::F7</span>,
            <span class="ident">VirtualKeyCode::F8</span> =&gt; <span class="ident">Key::F8</span>,
            <span class="ident">VirtualKeyCode::F9</span> =&gt; <span class="ident">Key::F9</span>,
            <span class="ident">VirtualKeyCode::F10</span> =&gt; <span class="ident">Key::F10</span>,
            <span class="ident">VirtualKeyCode::F11</span> =&gt; <span class="ident">Key::F11</span>,
            <span class="ident">VirtualKeyCode::F12</span> =&gt; <span class="ident">Key::F12</span>,
            <span class="kw">_</span> =&gt; {
                <span class="macro">println!</span>(<span class="string">&quot;Unknown winit key {:?}&quot;</span>, <span class="ident">key</span>);
                <span class="kw">return</span> <span class="prelude-val">None</span>;
            }
        })
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">txt</span>(<span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>) -&gt; <span class="ident">TextSpan</span> {
        <span class="ident">Line</span>(<span class="self">self</span>.<span class="ident">describe</span>()).<span class="ident">fg</span>(<span class="ident">ctx</span>.<span class="ident">style</span>().<span class="ident">text_hotkey_color</span>)
    }
}

<span class="comment">// TODO This is not an ideal representation at all.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">PartialOrd</span>, <span class="ident">Ord</span>, <span class="ident">Hash</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">MultiKey</span> {
    <span class="ident">Normal</span>(<span class="ident">Key</span>),
    <span class="ident">LCtrl</span>(<span class="ident">Key</span>),
    <span class="ident">Any</span>(<span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Key</span><span class="op">&gt;</span>),
}

<span class="kw">impl</span> <span class="ident">MultiKey</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">describe</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="ident">String</span> {
        <span class="kw">match</span> <span class="self">self</span> {
            <span class="ident">MultiKey::Normal</span>(<span class="ident">key</span>) =&gt; <span class="ident">key</span>.<span class="ident">describe</span>(),
            <span class="ident">MultiKey::LCtrl</span>(<span class="ident">key</span>) =&gt; <span class="macro">format!</span>(<span class="string">&quot;Ctrl+{}&quot;</span>, <span class="ident">key</span>.<span class="ident">describe</span>()),
            <span class="ident">MultiKey::Any</span>(<span class="kw-2">ref</span> <span class="ident">keys</span>) =&gt; <span class="ident">keys</span>
                .<span class="ident">iter</span>()
                .<span class="ident">map</span>(<span class="op">|</span><span class="ident">k</span><span class="op">|</span> <span class="ident">k</span>.<span class="ident">describe</span>())
                .<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>()
                .<span class="ident">join</span>(<span class="string">&quot;, &quot;</span>),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">txt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&amp;</span><span class="ident">EventCtx</span>) -&gt; <span class="ident">TextSpan</span> {
        <span class="ident">Line</span>(<span class="self">self</span>.<span class="ident">describe</span>()).<span class="ident">fg</span>(<span class="ident">ctx</span>.<span class="ident">style</span>().<span class="ident">text_hotkey_color</span>)
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">lctrl</span>(<span class="ident">key</span>: <span class="ident">Key</span>) -&gt; <span class="ident">MultiKey</span> {
    <span class="ident">MultiKey::LCtrl</span>(<span class="ident">key</span>)
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">hotkeys</span>(<span class="ident">keys</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Key</span><span class="op">&gt;</span>) -&gt; <span class="ident">MultiKey</span> {
    <span class="ident">MultiKey::Any</span>(<span class="ident">keys</span>)
}

<span class="kw">impl</span> <span class="ident">std::convert::From</span><span class="op">&lt;</span><span class="ident">Key</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">MultiKey</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">key</span>: <span class="ident">Key</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">MultiKey</span><span class="op">&gt;</span> {
        <span class="prelude-val">Some</span>(<span class="ident">MultiKey::Normal</span>(<span class="ident">key</span>))
    }
}

<span class="kw">impl</span> <span class="ident">std::convert::From</span><span class="op">&lt;</span><span class="ident">Key</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">MultiKey</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">key</span>: <span class="ident">Key</span>) -&gt; <span class="ident">MultiKey</span> {
        <span class="ident">MultiKey::Normal</span>(<span class="ident">key</span>)
    }
}
</code></pre></div>
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