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Make compositor event handling a Layer trait

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This simplifies the way that event handling interacts with the
compositor.
This commit is contained in:
Martin Robinson 2014-10-27 09:45:33 -07:00
parent 0c12f630e6
commit 96f6c53b52
3 changed files with 161 additions and 148 deletions
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58
components/compositing/compositor.rs
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@ -8,8 +8,7 @@ use compositor_task::{GetGraphicsMetadata, CreateOrUpdateRootLayer, CreateOrUpda
use compositor_task::{SetLayerOrigin, Paint, ScrollFragmentPoint, LoadComplete};
use compositor_task::{ShutdownComplete, ChangeRenderState, RenderMsgDiscarded};
use constellation::SendableFrameTree;
use events;
use events::ScrollPositionChanged;
use events::{LayerEventHandling, ScrollPositionChanged};
use pipeline::CompositionPipeline;
use windowing;
use windowing::{FinishedWindowEvent, IdleWindowEvent, LoadUrlWindowEvent, MouseWindowClickEvent};
@ -132,6 +131,11 @@ enum ShutdownState {
FinishedShuttingDown,
}
struct HitTestResult {
layer: Rc<Layer<CompositorData>>,
point: TypedPoint2D<LayerPixel, f32>,
}
impl<Window: WindowMethods> IOCompositor<Window> {
fn new(window: Rc<Window>,
port: Receiver<Msg>,
@ -548,8 +552,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
match self.find_layer_with_pipeline_and_layer_id(pipeline_id, layer_id) {
Some(ref layer) => {
if layer.extra_data.borrow().wants_scroll_events == WantsScrollEvents {
events::clamp_scroll_offset_and_scroll_layer(layer.clone(),
TypedPoint2D(0f32, 0f32) - origin);
layer.clamp_scroll_offset_and_scroll_layer(TypedPoint2D(0f32, 0f32) - origin);
}
true
}
@ -720,14 +723,16 @@ impl<Window: WindowMethods> IOCompositor<Window> {
MouseWindowMouseDownEvent(_, p) => p,
MouseWindowMouseUpEvent(_, p) => p,
};
for layer in self.scene.root.iter() {
events::send_mouse_event(layer.clone(), mouse_window_event, point / self.scene.scale);
match self.find_topmost_layer_at_point(point / self.scene.scale) {
Some(result) => result.layer.send_mouse_event(mouse_window_event, result.point),
None => {},
}
}
fn on_mouse_window_move_event_class(&self, cursor: TypedPoint2D<DevicePixel, f32>) {
for layer in self.scene.root.iter() {
events::send_mouse_move_event(layer.clone(), cursor / self.scene.scale);
match self.find_topmost_layer_at_point(cursor / self.scene.scale) {
Some(result) => result.layer.send_mouse_move_event(result.point),
None => {},
}
}
@ -740,9 +745,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
let mut scroll = false;
match self.scene.root {
Some(ref mut layer) => {
scroll = events::handle_scroll_event(layer.clone(),
delta,
cursor) == ScrollPositionChanged;
scroll = layer.handle_scroll_event(delta, cursor) == ScrollPositionChanged;
}
None => { }
}
@ -798,9 +801,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
let cursor = TypedPoint2D(-1f32, -1f32); // Make sure this hits the base layer.
match self.scene.root {
Some(ref mut layer) => {
events::handle_scroll_event(layer.clone(),
page_delta,
cursor);
layer.handle_scroll_event(page_delta, cursor);
}
None => { }
}
@ -1002,4 +1003,33 @@ impl<Window: WindowMethods> IOCompositor<Window> {
fn recomposite_if(&mut self, result: bool) {
self.recomposite = result || self.recomposite;
}
fn find_topmost_layer_at_point_for_layer(&self,
layer: Rc<Layer<CompositorData>>,
point: TypedPoint2D<LayerPixel, f32>)
-> Option<HitTestResult> {
let child_point = point - layer.bounds.borrow().origin;
for child in layer.children().iter().rev() {
let result = self.find_topmost_layer_at_point_for_layer(child.clone(), child_point);
if result.is_some() {
return result;
}
}
let point = point - *layer.content_offset.borrow();
if !layer.bounds.borrow().contains(&point) {
return None;
}
return Some(HitTestResult { layer: layer, point: point });
}
fn find_topmost_layer_at_point(&self,
point: TypedPoint2D<LayerPixel, f32>)
-> Option<HitTestResult> {
match self.scene.root {
Some(ref layer) => self.find_topmost_layer_at_point_for_layer(layer.clone(), point),
None => None,
}
}
}