зеркало из https://github.com/mozilla/gecko-dev.git
315 строки
10 KiB
Rust
315 строки
10 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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extern crate euclid;
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extern crate gleam;
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extern crate glutin;
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extern crate webrender;
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extern crate winit;
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#[path = "common/boilerplate.rs"]
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mod boilerplate;
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use crate::boilerplate::{Example, HandyDandyRectBuilder};
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use euclid::vec2;
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use winit::TouchPhase;
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use std::collections::HashMap;
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use webrender::ShaderPrecacheFlags;
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use webrender::api::*;
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use webrender::api::units::*;
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#[derive(Debug)]
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enum Gesture {
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None,
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Pan,
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Zoom,
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}
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#[derive(Debug)]
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struct Touch {
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id: u64,
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start_x: f32,
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start_y: f32,
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current_x: f32,
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current_y: f32,
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}
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fn dist(x0: f32, y0: f32, x1: f32, y1: f32) -> f32 {
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let dx = x0 - x1;
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let dy = y0 - y1;
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((dx * dx) + (dy * dy)).sqrt()
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}
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impl Touch {
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fn distance_from_start(&self) -> f32 {
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dist(self.start_x, self.start_y, self.current_x, self.current_y)
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}
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fn initial_distance_from_other(&self, other: &Touch) -> f32 {
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dist(self.start_x, self.start_y, other.start_x, other.start_y)
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}
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fn current_distance_from_other(&self, other: &Touch) -> f32 {
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dist(
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self.current_x,
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self.current_y,
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other.current_x,
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other.current_y,
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)
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}
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}
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struct TouchState {
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active_touches: HashMap<u64, Touch>,
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current_gesture: Gesture,
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start_zoom: f32,
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current_zoom: f32,
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start_pan: DeviceIntPoint,
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current_pan: DeviceIntPoint,
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}
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enum TouchResult {
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None,
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Pan(DeviceIntPoint),
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Zoom(f32),
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}
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impl TouchState {
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fn new() -> TouchState {
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TouchState {
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active_touches: HashMap::new(),
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current_gesture: Gesture::None,
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start_zoom: 1.0,
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current_zoom: 1.0,
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start_pan: DeviceIntPoint::zero(),
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current_pan: DeviceIntPoint::zero(),
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}
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}
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fn handle_event(&mut self, touch: winit::Touch) -> TouchResult {
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match touch.phase {
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TouchPhase::Started => {
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debug_assert!(!self.active_touches.contains_key(&touch.id));
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self.active_touches.insert(
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touch.id,
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Touch {
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id: touch.id,
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start_x: touch.location.x as f32,
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start_y: touch.location.y as f32,
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current_x: touch.location.x as f32,
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current_y: touch.location.y as f32,
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},
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);
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self.current_gesture = Gesture::None;
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}
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TouchPhase::Moved => {
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match self.active_touches.get_mut(&touch.id) {
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Some(active_touch) => {
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active_touch.current_x = touch.location.x as f32;
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active_touch.current_y = touch.location.y as f32;
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}
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None => panic!("move touch event with unknown touch id!"),
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}
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match self.current_gesture {
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Gesture::None => {
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let mut over_threshold_count = 0;
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let active_touch_count = self.active_touches.len();
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for (_, touch) in &self.active_touches {
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if touch.distance_from_start() > 8.0 {
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over_threshold_count += 1;
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}
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}
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if active_touch_count == over_threshold_count {
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if active_touch_count == 1 {
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self.start_pan = self.current_pan;
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self.current_gesture = Gesture::Pan;
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} else if active_touch_count == 2 {
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self.start_zoom = self.current_zoom;
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self.current_gesture = Gesture::Zoom;
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}
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}
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}
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Gesture::Pan => {
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let keys: Vec<u64> = self.active_touches.keys().cloned().collect();
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debug_assert!(keys.len() == 1);
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let active_touch = &self.active_touches[&keys[0]];
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let x = active_touch.current_x - active_touch.start_x;
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let y = active_touch.current_y - active_touch.start_y;
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self.current_pan.x = self.start_pan.x + x.round() as i32;
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self.current_pan.y = self.start_pan.y + y.round() as i32;
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return TouchResult::Pan(self.current_pan);
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}
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Gesture::Zoom => {
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let keys: Vec<u64> = self.active_touches.keys().cloned().collect();
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debug_assert!(keys.len() == 2);
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let touch0 = &self.active_touches[&keys[0]];
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let touch1 = &self.active_touches[&keys[1]];
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let initial_distance = touch0.initial_distance_from_other(touch1);
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let current_distance = touch0.current_distance_from_other(touch1);
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self.current_zoom = self.start_zoom * current_distance / initial_distance;
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return TouchResult::Zoom(self.current_zoom);
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}
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}
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}
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TouchPhase::Ended | TouchPhase::Cancelled => {
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self.active_touches.remove(&touch.id).unwrap();
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self.current_gesture = Gesture::None;
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}
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}
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TouchResult::None
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}
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}
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fn main() {
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let mut app = App {
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touch_state: TouchState::new(),
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};
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boilerplate::main_wrapper(&mut app, None);
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}
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struct App {
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touch_state: TouchState,
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}
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impl Example for App {
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// Make this the only example to test all shaders for compile errors.
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const PRECACHE_SHADER_FLAGS: ShaderPrecacheFlags = ShaderPrecacheFlags::FULL_COMPILE;
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fn render(
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&mut self,
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api: &RenderApi,
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builder: &mut DisplayListBuilder,
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txn: &mut Transaction,
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_: DeviceIntSize,
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pipeline_id: PipelineId,
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_document_id: DocumentId,
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) {
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let content_bounds = LayoutRect::new(LayoutPoint::zero(), builder.content_size());
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let root_space_and_clip = SpaceAndClipInfo::root_scroll(pipeline_id);
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let spatial_id = root_space_and_clip.spatial_id;
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builder.push_simple_stacking_context(
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content_bounds.origin,
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spatial_id,
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true,
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);
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let image_mask_key = api.generate_image_key();
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txn.add_image(
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image_mask_key,
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ImageDescriptor::new(2, 2, ImageFormat::R8, true, false),
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ImageData::new(vec![0, 80, 180, 255]),
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None,
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);
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let mask = ImageMask {
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image: image_mask_key,
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rect: (75, 75).by(100, 100),
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repeat: false,
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};
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let complex = ComplexClipRegion::new(
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(50, 50).to(150, 150),
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BorderRadius::uniform(20.0),
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ClipMode::Clip
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);
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let clip_id = builder.define_clip(
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&root_space_and_clip,
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content_bounds,
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vec![complex],
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Some(mask)
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);
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builder.push_rect(
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&CommonItemProperties::new(
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(100, 100).to(200, 200),
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SpaceAndClipInfo { spatial_id, clip_id },
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),
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ColorF::new(0.0, 1.0, 0.0, 1.0),
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);
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builder.push_rect(
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&CommonItemProperties::new(
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(250, 100).to(350, 200),
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SpaceAndClipInfo { spatial_id, clip_id },
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),
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ColorF::new(0.0, 1.0, 0.0, 1.0),
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);
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let border_side = BorderSide {
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color: ColorF::new(0.0, 0.0, 1.0, 1.0),
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style: BorderStyle::Groove,
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};
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let border_widths = LayoutSideOffsets::new_all_same(10.0);
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let border_details = BorderDetails::Normal(NormalBorder {
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top: border_side,
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right: border_side,
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bottom: border_side,
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left: border_side,
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radius: BorderRadius::uniform(20.0),
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do_aa: true,
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});
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let bounds = (100, 100).to(200, 200);
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builder.push_border(
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&CommonItemProperties::new(
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bounds,
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SpaceAndClipInfo { spatial_id, clip_id },
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),
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bounds,
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border_widths,
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border_details,
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);
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if false {
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// draw box shadow?
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let simple_box_bounds = (20, 200).by(50, 50);
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let offset = vec2(10.0, 10.0);
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let color = ColorF::new(1.0, 1.0, 1.0, 1.0);
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let blur_radius = 0.0;
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let spread_radius = 0.0;
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let simple_border_radius = 8.0;
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let box_shadow_type = BoxShadowClipMode::Inset;
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builder.push_box_shadow(
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&CommonItemProperties::new(content_bounds, root_space_and_clip),
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simple_box_bounds,
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offset,
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color,
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blur_radius,
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spread_radius,
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BorderRadius::uniform(simple_border_radius),
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box_shadow_type,
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);
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}
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builder.pop_stacking_context();
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}
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fn on_event(&mut self, event: winit::WindowEvent, api: &RenderApi, document_id: DocumentId) -> bool {
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let mut txn = Transaction::new();
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match event {
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winit::WindowEvent::Touch(touch) => match self.touch_state.handle_event(touch) {
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TouchResult::Pan(pan) => {
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txn.set_pan(pan);
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}
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TouchResult::Zoom(zoom) => {
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txn.set_pinch_zoom(ZoomFactor::new(zoom));
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}
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TouchResult::None => {}
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},
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_ => (),
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}
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if !txn.is_empty() {
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txn.generate_frame();
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api.send_transaction(document_id, txn);
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}
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false
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}
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}
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