<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `widgetry/src/widgets/just_draw.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>just_draw.rs - source</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings"></script><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"> <link rel="alternate icon" 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id="141">141</span> </pre><div class="example-wrap"><pre class="rust "> <span class="kw">use</span> <span class="ident">geom</span>::<span class="ident">Polygon</span>; <span class="kw">use</span> <span class="kw">crate</span>::{ <span class="ident">Drawable</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">GfxCtx</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">ScreenRectangle</span>, <span class="ident">Text</span>, <span class="ident">Widget</span>, <span class="ident">WidgetImpl</span>, <span class="ident">WidgetOutput</span>, }; <span class="comment">// Just draw something, no interaction.</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">JustDraw</span> { <span class="kw">pub</span> <span class="ident">draw</span>: <span class="ident">Drawable</span>, <span class="kw">pub</span> <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>, <span class="kw">pub</span> <span class="ident">dims</span>: <span class="ident">ScreenDims</span>, } <span class="kw">impl</span> <span class="ident">JustDraw</span> { <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">wrap</span>(<span class="ident">ctx</span>: <span class="kw-2">&</span><span class="ident">EventCtx</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Widget</span> { <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">JustDraw</span> { <span class="ident">dims</span>: <span class="ident">batch</span>.<span class="ident">get_dims</span>(), <span class="ident">draw</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>), <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>), })) } } <span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">JustDraw</span> { <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ScreenDims</span> { <span class="self">self</span>.<span class="ident">dims</span> } <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) { <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</span>; } <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</span>) {} <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) { <span class="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">draw</span>); } } <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DrawWithTooltips</span> { <span class="ident">draw</span>: <span class="ident">Drawable</span>, <span class="ident">tooltips</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">Polygon</span>, <span class="ident">Text</span>)<span class="op">></span>, <span class="ident">hover</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">></span> <span class="ident">GeomBatch</span><span class="op">></span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>, <span class="ident">dims</span>: <span class="ident">ScreenDims</span>, } <span class="kw">impl</span> <span class="ident">DrawWithTooltips</span> { <span class="doccomment">/// `batch`: the `GeomBatch` to draw</span> <span class="doccomment">/// `tooltips`: (hitbox, text) tuples where each `text` is shown when the user hovers over</span> <span class="doccomment">/// the respective `hitbox`</span> <span class="doccomment">/// `hover`: returns a GeomBatch to render upon hovering. Return an `GeomBox::new()` if</span> <span class="doccomment">/// you want hovering to be a no-op</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>( <span class="ident">ctx</span>: <span class="kw-2">&</span><span class="ident">EventCtx</span>, <span class="ident">batch</span>: <span class="ident">GeomBatch</span>, <span class="ident">tooltips</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">Polygon</span>, <span class="ident">Text</span>)<span class="op">></span>, <span class="ident">hover</span>: <span class="ident">Box</span><span class="op"><</span><span class="kw">dyn</span> <span class="ident">Fn</span>(<span class="kw-2">&</span><span class="ident">Polygon</span>) <span class="op">-</span><span class="op">></span> <span class="ident">GeomBatch</span><span class="op">></span>, ) <span class="op">-</span><span class="op">></span> <span class="ident">Widget</span> { <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">DrawWithTooltips</span> { <span class="ident">dims</span>: <span class="ident">batch</span>.<span class="ident">get_dims</span>(), <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>), <span class="ident">hover</span>, <span class="ident">draw</span>: <span class="ident">ctx</span>.<span class="ident">upload</span>(<span class="ident">batch</span>), <span class="ident">tooltips</span>, })) } } <span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">DrawWithTooltips</span> { <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ScreenDims</span> { <span class="self">self</span>.<span class="ident">dims</span> } <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) { <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</span>; } <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</span>) {} <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">g</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) { <span class="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">draw</span>); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">cursor</span>) <span class="op">=</span> <span class="ident">g</span>.<span class="ident">canvas</span>.<span class="ident">get_cursor_in_screen_space</span>() { <span class="kw">if</span> <span class="op">!</span><span class="ident">ScreenRectangle</span>::<span class="ident">top_left</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="self">self</span>.<span class="ident">dims</span>).<span class="ident">contains</span>(<span class="ident">cursor</span>) { <span class="kw">return</span>; } <span class="kw">let</span> <span class="ident">translated</span> <span class="op">=</span> <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="ident">cursor</span>.<span class="ident">x</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">top_left</span>.<span class="ident">x</span>, <span class="ident">cursor</span>.<span class="ident">y</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">top_left</span>.<span class="ident">y</span>).<span class="ident">to_pt</span>(); <span class="comment">// TODO Assume regions are non-overlapping</span> <span class="kw">for</span> (<span class="ident">region</span>, <span class="ident">txt</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">tooltips</span> { <span class="kw">if</span> <span class="ident">region</span>.<span class="ident">contains_pt</span>(<span class="ident">translated</span>) { <span class="kw">let</span> <span class="ident">extra</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">upload</span>((<span class="self">self</span>.<span class="ident">hover</span>)(<span class="ident">region</span>)); <span class="ident">g</span>.<span class="ident">redraw_at</span>(<span class="self">self</span>.<span class="ident">top_left</span>, <span class="kw-2">&</span><span class="ident">extra</span>); <span class="ident">g</span>.<span class="ident">draw_mouse_tooltip</span>(<span class="ident">txt</span>.<span class="ident">clone</span>()); <span class="kw">return</span>; } } } } } <span class="comment">// TODO Name is bad. Lay out JustDraw stuff with flexbox, just to consume it and produce one big</span> <span class="comment">// GeomBatch.</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DeferDraw</span> { <span class="kw">pub</span> <span class="ident">batch</span>: <span class="ident">GeomBatch</span>, <span class="kw">pub</span> <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>, <span class="ident">dims</span>: <span class="ident">ScreenDims</span>, } <span class="kw">impl</span> <span class="ident">DeferDraw</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">batch</span>: <span class="ident">GeomBatch</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Widget</span> { <span class="ident">Widget</span>::<span class="ident">new</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">DeferDraw</span> { <span class="ident">dims</span>: <span class="ident">batch</span>.<span class="ident">get_dims</span>(), <span class="ident">batch</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>::<span class="ident">new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>), })) } } <span class="kw">impl</span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">DeferDraw</span> { <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">ScreenDims</span> { <span class="self">self</span>.<span class="ident">dims</span> } <span class="kw">fn</span> <span class="ident">set_pos</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">top_left</span>: <span class="ident">ScreenPt</span>) { <span class="self">self</span>.<span class="ident">top_left</span> <span class="op">=</span> <span class="ident">top_left</span>; } <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">EventCtx</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">WidgetOutput</span>) { <span class="macro">unreachable</span><span class="macro">!</span>() } <span class="kw">fn</span> <span class="ident">draw</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">GfxCtx</span>) { <span class="macro">unreachable</span><span class="macro">!</span>() } } </pre></div> </section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="widgetry"></div> <script src="../../../main.js"></script><script src="../../../source-script.js"></script><script src="../../../source-files.js"></script><script defer src="../../../search-index.js"></script></body></html>