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Refactor touch handling and add pinch zoom gesture
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parent
d11f96e270
commit
eb2a37d41c
3 changed files with 258 additions and 118 deletions
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@ -27,7 +27,7 @@ use layers::rendergl;
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use layers::rendergl::RenderContext;
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use layers::scene::Scene;
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use layout_traits::LayoutControlChan;
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use msg::compositor_msg::{Epoch, EventResult, FrameTreeId, LayerId, LayerKind};
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use msg::compositor_msg::{Epoch, FrameTreeId, LayerId, LayerKind};
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use msg::compositor_msg::{LayerProperties, ScrollPolicy};
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use msg::constellation_msg::{AnimationState, Image, PixelFormat};
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use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData, MouseButton};
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@ -48,6 +48,7 @@ use std::sync::mpsc::Sender;
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use style_traits::viewport::ViewportConstraints;
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use surface_map::SurfaceMap;
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use time::{precise_time_ns, precise_time_s};
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use touch::{TouchHandler, TouchAction};
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use url::Url;
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use util::geometry::{PagePx, ScreenPx, ViewportPx};
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use util::opts;
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@ -78,9 +79,6 @@ const BUFFER_MAP_SIZE: usize = 10000000;
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const MAX_ZOOM: f32 = 8.0;
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const MIN_ZOOM: f32 = 0.1;
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/// Minimum number of ScreenPx to begin touch scrolling.
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const TOUCH_PAN_MIN_SCREEN_PX: f32 = 20.0;
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/// Holds the state when running reftests that determines when it is
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/// safe to save the output image.
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#[derive(Copy, Clone, PartialEq)]
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@ -179,7 +177,7 @@ pub struct IOCompositor<Window: WindowMethods> {
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fragment_point: Option<Point2D<f32>>,
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/// Touch input state machine
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touch_gesture_state: TouchState,
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touch_handler: TouchHandler,
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/// Pending scroll events.
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pending_scroll_events: Vec<ScrollEvent>,
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@ -199,28 +197,6 @@ pub struct IOCompositor<Window: WindowMethods> {
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last_mouse_move_recipient: Option<PipelineId>,
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}
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/// The states of the touch input state machine.
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///
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/// TODO: Currently Add support for "flinging" (scrolling inertia), pinch zooming.
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enum TouchState {
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/// Not tracking any touch point
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Nothing,
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/// A touchstart event was dispatched to the page, but the response wasn't received yet.
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/// Contains the number of active touch points and the initial touch location.
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WaitingForScript(u32, TypedPoint2D<DevicePixel, f32>),
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/// Script is consuming the current touch sequence; don't perform default actions.
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/// Contains the number of active touch points.
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DefaultPrevented(u32),
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/// A single touch point is active and may perform click or pan default actions.
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/// Contains the initial touch location.
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Touching(TypedPoint2D<DevicePixel, f32>),
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/// A single touch point is active and has started panning. Contains the latest touch location.
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Panning(TypedPoint2D<DevicePixel, f32>),
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/// A multi-touch gesture is in progress. Contains the number of active touch points.
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MultiTouch(u32),
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}
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pub struct ScrollEvent {
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delta: TypedPoint2D<DevicePixel, f32>,
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cursor: TypedPoint2D<DevicePixel, i32>,
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@ -347,7 +323,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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channel_to_self: state.sender.clone_compositor_proxy(),
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scrolling_timer: ScrollingTimerProxy::new(state.sender),
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composition_request: CompositionRequest::NoCompositingNecessary,
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touch_gesture_state: TouchState::Nothing,
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touch_handler: TouchHandler::new(),
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pending_scroll_events: Vec::new(),
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composite_target: composite_target,
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shutdown_state: ShutdownState::NotShuttingDown,
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@ -556,19 +532,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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}
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(Msg::TouchEventProcessed(result), ShutdownState::NotShuttingDown) => {
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match self.touch_gesture_state {
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TouchState::WaitingForScript(n, p) => {
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self.touch_gesture_state = match result {
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EventResult::DefaultPrevented => TouchState::DefaultPrevented(n),
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EventResult::DefaultAllowed => if n > 1 {
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TouchState::MultiTouch(n)
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} else {
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TouchState::Touching(p)
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}
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};
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}
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_ => {}
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}
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self.touch_handler.on_event_processed(result);
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}
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(Msg::SetCursor(cursor), ShutdownState::NotShuttingDown) => {
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@ -1220,25 +1184,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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}
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fn on_touch_down(&mut self, identifier: TouchId, point: TypedPoint2D<DevicePixel, f32>) {
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self.touch_gesture_state = match self.touch_gesture_state {
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TouchState::Nothing => {
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TouchState::WaitingForScript(1, point)
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}
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TouchState::Touching(_) |
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TouchState::Panning(_) => {
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// Was a single-touch sequence; now a multi-touch sequence:
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TouchState::MultiTouch(2)
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}
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TouchState::WaitingForScript(n, p) => {
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TouchState::WaitingForScript(n + 1, p)
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}
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TouchState::DefaultPrevented(n) => {
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TouchState::DefaultPrevented(n + 1)
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}
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TouchState::MultiTouch(n) => {
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TouchState::MultiTouch(n + 1)
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}
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};
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self.touch_handler.on_touch_down(identifier, point);
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self, TouchEvent(TouchEventType::Down, identifier,
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result.point.to_untyped()));
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@ -1246,89 +1192,45 @@ impl<Window: WindowMethods> IOCompositor<Window> {
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}
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fn on_touch_move(&mut self, identifier: TouchId, point: TypedPoint2D<DevicePixel, f32>) {
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match self.touch_gesture_state {
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TouchState::Nothing => warn!("Got unexpected touch move event"),
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TouchState::WaitingForScript(..) => {
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// TODO: Queue events while waiting for script?
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}
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TouchState::Touching(p0) => {
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let delta = point - p0;
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let px: TypedPoint2D<ScreenPx, _> = delta / self.device_pixels_per_screen_px();
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let px = px.to_untyped();
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if px.x.abs() > TOUCH_PAN_MIN_SCREEN_PX ||
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px.y.abs() > TOUCH_PAN_MIN_SCREEN_PX
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{
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self.touch_gesture_state = TouchState::Panning(point);
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self.on_scroll_window_event(delta, point.cast().unwrap());
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}
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}
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TouchState::Panning(p0) => {
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let delta = point - p0;
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match self.touch_handler.on_touch_move(identifier, point) {
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TouchAction::Scroll(delta) => {
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self.on_scroll_window_event(delta, point.cast().unwrap());
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self.touch_gesture_state = TouchState::Panning(point);
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}
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TouchState::DefaultPrevented(_) => {
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// Send the event to script.
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TouchAction::Zoom(magnification, scroll_delta) => {
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let cursor = Point2D::typed(-1, -1); // Make sure this hits the base layer.
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self.on_pinch_zoom_window_event(magnification);
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self.on_scroll_window_event(scroll_delta, cursor);
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}
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TouchAction::DispatchEvent => {
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self, TouchEvent(TouchEventType::Move, identifier,
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result.point.to_untyped()));
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}
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}
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TouchState::MultiTouch(_) => {
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// TODO: Pinch zooming.
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}
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_ => {}
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}
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}
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fn on_touch_up(&mut self, identifier: TouchId, point: TypedPoint2D<DevicePixel, f32>) {
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// Send the event to script.
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self, TouchEvent(TouchEventType::Up, identifier,
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result.point.to_untyped()));
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}
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self.touch_gesture_state = match self.touch_gesture_state {
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TouchState::Touching(_) => {
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// TODO: If the duration exceeds some threshold, send a contextmenu event instead.
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// TODO: Don't send a click if preventDefault is called on the touchend event.
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match self.touch_handler.on_touch_up(identifier, point) {
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TouchAction::Click => {
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self.simulate_mouse_click(point);
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TouchState::Nothing
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}
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TouchState::Nothing |
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TouchState::Panning(_) |
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TouchState::WaitingForScript(1, _) |
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TouchState::DefaultPrevented(1) |
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TouchState::MultiTouch(1) => {
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TouchState::Nothing
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}
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TouchState::WaitingForScript(n, p) => TouchState::WaitingForScript(n - 1, p),
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TouchState::DefaultPrevented(n) => TouchState::DefaultPrevented(n - 1),
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TouchState::MultiTouch(n) => TouchState::MultiTouch(n - 1),
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};
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_ => {}
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}
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}
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fn on_touch_cancel(&mut self, identifier: TouchId, point: TypedPoint2D<DevicePixel, f32>) {
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// Send the event to script.
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self.touch_handler.on_touch_cancel(identifier, point);
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if let Some(result) = self.find_topmost_layer_at_point(point / self.scene.scale) {
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result.layer.send_event(self, TouchEvent(TouchEventType::Cancel, identifier,
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result.point.to_untyped()));
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}
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self.touch_gesture_state = match self.touch_gesture_state {
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TouchState::Nothing |
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TouchState::Touching(_) |
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TouchState::Panning(_) |
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TouchState::WaitingForScript(1, _) |
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TouchState::DefaultPrevented(1) |
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TouchState::MultiTouch(1) => {
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TouchState::Nothing
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}
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TouchState::WaitingForScript(n, p) => TouchState::WaitingForScript(n - 1, p),
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TouchState::DefaultPrevented(n) => TouchState::DefaultPrevented(n - 1),
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TouchState::MultiTouch(n) => TouchState::MultiTouch(n - 1),
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};
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}
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/// http://w3c.github.io/touch-events/#mouse-events
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