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Eliminate iteration over Option types

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This idiom has been dying out in new Rust code; it's especially
confusing for layers because there is a higher chance of making the
mistaken assumption that the iteration is occurring over multiple
layers.
This commit is contained in:
Cameron Zwarich 2014-07-07 16:16:42 -07:00
parent f91d51cb2c
commit 512c986915
1 changed files with 24 additions and 15 deletions
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39
src/components/compositing/compositor.rs
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@ -413,8 +413,9 @@ impl IOCompositor {
Scrollable));
// Release all tiles from the layer before dropping it.
for layer in self.scene.root.mut_iter() {
CompositorData::clear_all_tiles(layer.clone());
match self.scene.root {
Some(ref mut layer) => CompositorData::clear_all_tiles(layer.clone()),
None => { }
}
self.scene.root = Some(new_root);
}
@ -685,11 +686,14 @@ impl IOCompositor {
let page_cursor = cursor.as_f32() / scale;
let page_window = self.page_window();
let mut scroll = false;
for layer in self.scene.root.mut_iter() {
scroll = CompositorData::handle_scroll_event(layer.clone(),
page_delta,
page_cursor,
page_window) || scroll;
match self.scene.root {
Some(ref mut layer) => {
scroll = CompositorData::handle_scroll_event(layer.clone(),
page_delta,
page_cursor,
page_window) || scroll;
}
None => { }
}
self.recomposite_if(scroll);
self.ask_for_tiles();
@ -739,11 +743,14 @@ impl IOCompositor {
let page_cursor = TypedPoint2D(-1f32, -1f32); // Make sure this hits the base layer
let page_window = self.page_window();
for layer in self.scene.root.mut_iter() {
CompositorData::handle_scroll_event(layer.clone(),
page_delta,
page_cursor,
page_window);
match self.scene.root {
Some(ref mut layer) => {
CompositorData::handle_scroll_event(layer.clone(),
page_delta,
page_cursor,
page_window);
}
None => { }
}
self.recomposite = true;
@ -762,17 +769,19 @@ impl IOCompositor {
fn ask_for_tiles(&mut self) {
let scale = self.device_pixels_per_page_px();
let page_window = self.page_window();
for layer in self.scene.root.mut_iter() {
if !layer.extra_data.borrow().hidden {
match self.scene.root {
Some(ref mut layer) if !layer.extra_data.borrow().hidden => {
let rect = Rect(Point2D(0f32, 0f32), page_window.to_untyped());
let recomposite = CompositorData::get_buffer_request(layer.clone(),
&self.graphics_context,
rect,
scale.get());
self.recomposite = self.recomposite || recomposite;
} else {
}
Some(_) => {
debug!("Compositor: root layer is hidden!");
}
None => { }
}
}