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Constrain the viewport & zoom when reflowing

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This commit is contained in:
James Gilbertson 2015-03-24 23:46:47 -06:00
parent 8977316d3e
commit 138596e861
13 changed files with 100 additions and 13 deletions
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38
components/compositing/compositor.rs
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@ -42,6 +42,7 @@ use std::mem as std_mem;
use std::rc::Rc;
use std::slice::bytes::copy_memory;
use std::sync::mpsc::Sender;
use style::viewport::ViewportConstraints;
use time::{precise_time_ns, precise_time_s};
use url::Url;
use util::geometry::{PagePx, ScreenPx, ViewportPx};
@ -74,6 +75,10 @@ pub struct IOCompositor<Window: WindowMethods> {
/// "Mobile-style" zoom that does not reflow the page.
viewport_zoom: ScaleFactor<PagePx, ViewportPx, f32>,
/// Viewport zoom constraints provided by @viewport.
min_viewport_zoom: Option<ScaleFactor<PagePx, ViewportPx, f32>>,
max_viewport_zoom: Option<ScaleFactor<PagePx, ViewportPx, f32>>,
/// "Desktop-style" zoom that resizes the viewport to fit the window.
/// See `ViewportPx` docs in util/geom.rs for details.
page_zoom: ScaleFactor<ViewportPx, ScreenPx, f32>,
@ -214,6 +219,8 @@ impl<Window: WindowMethods> IOCompositor<Window> {
shutdown_state: ShutdownState::NotShuttingDown,
page_zoom: ScaleFactor::new(1.0),
viewport_zoom: ScaleFactor::new(1.0),
min_viewport_zoom: None,
max_viewport_zoom: None,
zoom_action: false,
zoom_time: 0f64,
got_load_complete_message: false,
@ -384,6 +391,10 @@ impl<Window: WindowMethods> IOCompositor<Window> {
}
}
(Msg::ViewportConstrained(pipeline_id, constraints), ShutdownState::NotShuttingDown) => {
self.constrain_viewport(pipeline_id, constraints);
}
// When we are shutting_down, we need to avoid performing operations
// such as Paint that may crash because we have begun tearing down
// the rest of our resources.
@ -928,6 +939,21 @@ impl<Window: WindowMethods> IOCompositor<Window> {
}
}
fn constrain_viewport(&mut self, pipeline_id: PipelineId, constraints: ViewportConstraints) {
let is_root = self.root_pipeline.as_ref().map_or(false, |root_pipeline| {
root_pipeline.id == pipeline_id
});
if is_root {
// TODO: actual viewport size
self.viewport_zoom = constraints.initial_zoom;
self.min_viewport_zoom = constraints.min_zoom;
self.max_viewport_zoom = constraints.max_zoom;
self.update_zoom_transform();
}
}
fn device_pixels_per_screen_px(&self) -> ScaleFactor<ScreenPx, DevicePixel, f32> {
match opts::get().device_pixels_per_px {
Some(device_pixels_per_px) => device_pixels_per_px,
@ -959,12 +985,19 @@ impl<Window: WindowMethods> IOCompositor<Window> {
// TODO(pcwalton): I think this should go through the same queuing as scroll events do.
fn on_pinch_zoom_window_event(&mut self, magnification: f32) {
use num::Float;
self.zoom_action = true;
self.zoom_time = precise_time_s();
let old_viewport_zoom = self.viewport_zoom;
self.viewport_zoom = ScaleFactor::new((self.viewport_zoom.get() * magnification).max(1.0));
let viewport_zoom = self.viewport_zoom;
let mut viewport_zoom = self.viewport_zoom.get() * magnification;
if let Some(min_zoom) = self.min_viewport_zoom.as_ref() {
viewport_zoom = min_zoom.get().max(viewport_zoom)
}
let viewport_zoom = self.max_viewport_zoom.as_ref().map_or(1., |z| z.get()).min(viewport_zoom);
let viewport_zoom = ScaleFactor::new(viewport_zoom);
self.viewport_zoom = viewport_zoom;
self.update_zoom_transform();
@ -1435,4 +1468,3 @@ pub enum CompositingReason {
/// The window has been zoomed.
Zoom,
}