<!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/dropdown.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>dropdown.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><script src="../../../crates.js"></script><script defer src="../../../main.js"></script><script defer src="../../../source-script.js"></script><script defer 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id="207">207</span> </pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">CornerRadii</span>, <span class="ident">Distance</span>, <span class="ident">Polygon</span>, <span class="ident">Pt2D</span>}; <span class="kw">use</span> <span class="kw">crate</span>::{ <span class="ident">Button</span>, <span class="ident">Choice</span>, <span class="ident">Color</span>, <span class="ident">ControlState</span>, <span class="ident">CornerRounding</span>, <span class="ident">EdgeInsets</span>, <span class="ident">EventCtx</span>, <span class="ident">GeomBatch</span>, <span class="ident">GfxCtx</span>, <span class="ident">Menu</span>, <span class="ident">Outcome</span>, <span class="ident">ScreenDims</span>, <span class="ident">ScreenPt</span>, <span class="ident">ScreenRectangle</span>, <span class="ident">WidgetImpl</span>, <span class="ident">WidgetOutput</span>, }; <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span> { <span class="ident">current_idx</span>: <span class="ident">usize</span>, <span class="ident">btn</span>: <span class="ident">Button</span>, <span class="comment">// TODO Why not T?</span> <span class="ident">menu</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Menu</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span><span class="op">></span>, <span class="ident">label</span>: <span class="ident">String</span>, <span class="ident">is_persisten_split</span>: <span class="ident">bool</span>, <span class="ident">choices</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Choice</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>, } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">std::fmt::Debug</span><span class="op">></span> <span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span><span class="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">label</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">default_value</span>: <span class="ident">T</span>, <span class="ident">choices</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Choice</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>, <span class="comment">// TODO Ideally builder style</span> <span class="ident">is_persisten_split</span>: <span class="ident">bool</span>, ) -> <span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">current_idx</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=</span> <span class="ident">choices</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">data</span> <span class="op">==</span> <span class="ident">default_value</span>) { <span class="ident">idx</span> } <span class="kw">else</span> { <span class="macro">panic!</span>( <span class="string">"Dropdown {} has default_value {:?}, but none of the choices match that"</span>, <span class="ident">label</span>, <span class="ident">default_value</span> ); }; <span class="ident">Dropdown</span> { <span class="ident">current_idx</span>, <span class="ident">btn</span>: <span class="ident">make_btn</span>(<span class="ident">ctx</span>, <span class="kw-2">&</span><span class="ident">choices</span>[<span class="ident">current_idx</span>].<span class="ident">label</span>, <span class="ident">label</span>, <span class="ident">is_persisten_split</span>), <span class="ident">menu</span>: <span class="prelude-val">None</span>, <span class="ident">label</span>: <span class="ident">label</span>.<span class="ident">to_string</span>(), <span class="ident">is_persisten_split</span>, <span class="ident">choices</span>, } } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">current_value</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">T</span> { <span class="self">self</span>.<span class="ident">choices</span>[<span class="self">self</span>.<span class="ident">current_idx</span>].<span class="ident">data</span>.<span class="ident">clone</span>() } <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">current_value_label</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="ident">str</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">choices</span>[<span class="self">self</span>.<span class="ident">current_idx</span>].<span class="ident">label</span> } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">open_menu</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>) { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">menu</span> <span class="op">=</span> <span class="ident">Menu::new</span>( <span class="ident">ctx</span>, <span class="self">self</span>.<span class="ident">choices</span> .<span class="ident">iter</span>() .<span class="ident">enumerate</span>() .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">idx</span>, <span class="ident">c</span>)<span class="op">|</span> <span class="ident">c</span>.<span class="ident">with_value</span>(<span class="ident">idx</span>)) .<span class="ident">collect</span>(), ); <span class="ident">menu</span>.<span class="ident">set_current</span>(<span class="self">self</span>.<span class="ident">current_idx</span>); <span class="kw">let</span> <span class="ident">y1_below</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">top_left</span>.<span class="ident">y</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">dims</span>.<span class="ident">height</span> <span class="op">+</span> <span class="number">15.0</span>; <span class="ident">menu</span>.<span class="ident">set_pos</span>(<span class="ident">ScreenPt::new</span>( <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">top_left</span>.<span class="ident">x</span>, <span class="comment">// top_left_for_corner doesn't quite work</span> <span class="kw">if</span> <span class="ident">y1_below</span> <span class="op">+</span> <span class="ident">menu</span>.<span class="ident">get_dims</span>().<span class="ident">height</span> <span class="op"><</span> <span class="ident">ctx</span>.<span class="ident">canvas</span>.<span class="ident">window_height</span> { <span class="ident">y1_below</span> } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">top_left</span>.<span class="ident">y</span> <span class="op">-</span> <span class="number">15.0</span> <span class="op">-</span> <span class="ident">menu</span>.<span class="ident">get_dims</span>().<span class="ident">height</span> }, )); <span class="self">self</span>.<span class="ident">menu</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">menu</span>); } } <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">></span> <span class="ident">WidgetImpl</span> <span class="kw">for</span> <span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="kw">fn</span> <span class="ident">get_dims</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">ScreenDims</span> { <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">get_dims</span>() } <span class="kw">fn</span> <span class="ident">set_pos</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">btn</span>.<span class="ident">set_pos</span>(<span class="ident">top_left</span>); } <span class="kw">fn</span> <span class="ident">event</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">output</span>: <span class="kw-2">&mut</span> <span class="ident">WidgetOutput</span>) { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">m</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">menu</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tmp_ouput</span> <span class="op">=</span> <span class="ident">WidgetOutput::new</span>(); <span class="ident">m</span>.<span class="ident">event</span>(<span class="ident">ctx</span>, <span class="kw-2">&mut</span> <span class="ident">tmp_ouput</span>); <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Outcome::Clicked</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">tmp_ouput</span>.<span class="ident">outcome</span> { <span class="self">self</span>.<span class="ident">current_idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">menu</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>().<span class="ident">take_current_choice</span>(); <span class="ident">output</span>.<span class="ident">outcome</span> <span class="op">=</span> <span class="ident">Outcome::Changed</span>(<span class="self">self</span>.<span class="ident">label</span>.<span class="ident">clone</span>()); <span class="kw">let</span> <span class="ident">top_left</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">top_left</span>; <span class="self">self</span>.<span class="ident">btn</span> <span class="op">=</span> <span class="ident">make_btn</span>( <span class="ident">ctx</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">choices</span>[<span class="self">self</span>.<span class="ident">current_idx</span>].<span class="ident">label</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">label</span>, <span class="self">self</span>.<span class="ident">is_persisten_split</span>, ); <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">set_pos</span>(<span class="ident">top_left</span>); <span class="ident">output</span>.<span class="ident">redo_layout</span> <span class="op">=</span> <span class="bool-val">true</span>; } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">ctx</span>.<span class="ident">normal_left_click</span>() { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">pt</span>) <span class="op">=</span> <span class="ident">ctx</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::top_left</span>(<span class="ident">m</span>.<span class="ident">top_left</span>, <span class="ident">m</span>.<span class="ident">get_dims</span>()).<span class="ident">contains</span>(<span class="ident">pt</span>) { <span class="self">self</span>.<span class="ident">menu</span> <span class="op">=</span> <span class="prelude-val">None</span>; } } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">menu</span> <span class="op">=</span> <span class="prelude-val">None</span>; } <span class="kw">if</span> <span class="self">self</span>.<span class="ident">menu</span>.<span class="ident">is_some</span>() { <span class="ident">ctx</span>.<span class="ident">input</span>.<span class="ident">unconsume_event</span>(); } } } <span class="kw">else</span> { <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">event</span>(<span class="ident">ctx</span>, <span class="ident">output</span>); <span class="kw">if</span> <span class="kw">let</span> <span class="ident">Outcome::Clicked</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">output</span>.<span class="ident">outcome</span> { <span class="ident">output</span>.<span class="ident">outcome</span> <span class="op">=</span> <span class="ident">Outcome::Nothing</span>; <span class="self">self</span>.<span class="ident">open_menu</span>(<span class="ident">ctx</span>); } } <span class="kw">if</span> <span class="self">self</span>.<span class="ident">menu</span>.<span class="ident">is_some</span>() { <span class="ident">output</span>.<span class="ident">outcome</span> <span class="op">=</span> <span class="ident">Outcome::Focused</span>(<span class="self">self</span>.<span class="ident">label</span>.<span class="ident">clone</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">&mut</span> <span class="ident">GfxCtx</span>) { <span class="self">self</span>.<span class="ident">btn</span>.<span class="ident">draw</span>(<span class="ident">g</span>); <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">m</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">menu</span> { <span class="comment">// We need a background too! Add some padding and an outline.</span> <span class="comment">// TODO Little embedded Panel could make more sense?</span> <span class="kw">let</span> <span class="ident">pad</span> <span class="op">=</span> <span class="number">5.0</span>; <span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">get_dims</span>().<span class="ident">width</span> <span class="op">+</span> <span class="number">2.0</span> <span class="op">*</span> <span class="ident">pad</span>; <span class="kw">let</span> <span class="ident">height</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">get_dims</span>().<span class="ident">height</span> <span class="op">+</span> <span class="number">2.0</span> <span class="op">*</span> <span class="ident">pad</span>; <span class="kw">let</span> <span class="ident">rect</span> <span class="op">=</span> <span class="ident">Polygon::rounded_rectangle</span>(<span class="ident">width</span>, <span class="ident">height</span>, <span class="number">5.0</span>); <span class="kw">let</span> <span class="ident">draw_bg</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">upload</span>(<span class="ident">GeomBatch::from</span>(<span class="macro">vec!</span>[ (<span class="ident">g</span>.<span class="ident">style</span>().<span class="ident">field_bg</span>, <span class="ident">rect</span>.<span class="ident">clone</span>()), ( <span class="ident">g</span>.<span class="ident">style</span>().<span class="ident">dropdown_border</span>, <span class="ident">rect</span>.<span class="ident">to_outline</span>(<span class="ident">Distance::meters</span>(<span class="number">1.0</span>)).<span class="ident">unwrap</span>(), ), ])); <span class="ident">g</span>.<span class="ident">fork</span>( <span class="ident">Pt2D::new</span>(<span class="number">0.0</span>, <span class="number">0.0</span>), <span class="ident">ScreenPt::new</span>(<span class="ident">m</span>.<span class="ident">top_left</span>.<span class="ident">x</span> <span class="op">-</span> <span class="ident">pad</span>, <span class="ident">m</span>.<span class="ident">top_left</span>.<span class="ident">y</span> <span class="op">-</span> <span class="ident">pad</span>), <span class="number">1.0</span>, <span class="prelude-val">Some</span>(<span class="ident"><span class="kw">crate</span>::drawing::MENU_Z</span>), ); <span class="ident">g</span>.<span class="ident">redraw</span>(<span class="kw-2">&</span><span class="ident">draw_bg</span>); <span class="ident">g</span>.<span class="ident">unfork</span>(); <span class="ident">m</span>.<span class="ident">draw</span>(<span class="ident">g</span>); <span class="comment">// Dropdown menus often leak out of their Panel</span> <span class="ident">g</span>.<span class="ident">canvas</span> .<span class="ident">mark_covered_area</span>(<span class="ident">ScreenRectangle::top_left</span>(<span class="ident">m</span>.<span class="ident">top_left</span>, <span class="ident">m</span>.<span class="ident">get_dims</span>())); } } <span class="kw">fn</span> <span class="ident">can_restore</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="bool-val">true</span> } <span class="kw">fn</span> <span class="ident">restore</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">ctx</span>: <span class="kw-2">&mut</span> <span class="ident">EventCtx</span>, <span class="ident">prev</span>: <span class="kw-2">&</span><span class="kw">dyn</span> <span class="ident">WidgetImpl</span>) { <span class="kw">let</span> <span class="ident">prev</span> <span class="op">=</span> <span class="ident">prev</span>.<span class="ident">downcast_ref</span>::<span class="op"><</span><span class="ident">Dropdown</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>().<span class="ident">unwrap</span>(); <span class="kw">if</span> <span class="ident">prev</span>.<span class="ident">menu</span>.<span class="ident">is_some</span>() { <span class="self">self</span>.<span class="ident">open_menu</span>(<span class="ident">ctx</span>); <span class="comment">// TODO Preserve menu hovered item. Only matters if we've moved the cursor off the</span> <span class="comment">// menu.</span> } } } <span class="kw">fn</span> <span class="ident">make_btn</span>(<span class="ident">ctx</span>: <span class="kw-2">&</span><span class="ident">EventCtx</span>, <span class="ident">label</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">tooltip</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">is_persisten_split</span>: <span class="ident">bool</span>) -> <span class="ident">Button</span> { <span class="comment">// If we want to make Dropdown configurable, pass in or expose its button builder?</span> <span class="kw">let</span> <span class="ident">builder</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">is_persisten_split</span> { <span class="comment">// Quick hacks to make PersistentSplit's dropdown look a little better.</span> <span class="comment">// It's not ideal, but we only use one persistent split in the whole app</span> <span class="comment">// and it's front and center - we'll notice if something breaks.</span> <span class="ident">ctx</span>.<span class="ident">style</span>() .<span class="ident">btn_solid</span> .<span class="ident">dropdown</span>() .<span class="ident">padding</span>(<span class="ident">EdgeInsets</span> { <span class="ident">top</span>: <span class="number">15.0</span>, <span class="ident">bottom</span>: <span class="number">15.0</span>, <span class="ident">left</span>: <span class="number">8.0</span>, <span class="ident">right</span>: <span class="number">8.0</span>, }) .<span class="ident">corner_rounding</span>(<span class="ident">CornerRounding::CornerRadii</span>(<span class="ident">CornerRadii</span> { <span class="ident">top_left</span>: <span class="number">0.0</span>, <span class="ident">bottom_left</span>: <span class="number">0.0</span>, <span class="ident">bottom_right</span>: <span class="number">2.0</span>, <span class="ident">top_right</span>: <span class="number">2.0</span>, })) <span class="comment">// override any outline element within persistent split</span> .<span class="ident">outline</span>((<span class="number">0.0</span>, <span class="ident">Color::CLEAR</span>), <span class="ident">ControlState::Default</span>) } <span class="kw">else</span> { <span class="ident">ctx</span>.<span class="ident">style</span>().<span class="ident">btn_outline</span>.<span class="ident">dropdown</span>().<span class="ident">label_text</span>(<span class="ident">label</span>) }; <span class="ident">builder</span>.<span class="ident">build</span>(<span class="ident">ctx</span>, <span class="ident">tooltip</span>) } </code></pre></div> </section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="widgetry" data-search-index-js="../../../search-index.js" data-search-js="../../../search.js"></div> </body></html>