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Make DisplayList hit testing a method on DisplayList
This will allow us to hit test into DisplayLists that are not directly contained in StackingContexts, but instead are children of PaintLayers. It also makes things slightly simpler.
This commit is contained in:
Martin Robinson
parent
8027777e24
commit
a2cf8e583d
1 changed files with 119 additions and 114 deletions
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@ -323,6 +323,121 @@ impl DisplayList {
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paint_subcontext.pop_clip_if_applicable();
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paint_subcontext.draw_target.set_transform(&old_transform)
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}
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pub fn hit_test(&self,
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point: Point2D<Au>,
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result: &mut Vec<DisplayItemMetadata>,
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topmost_only: bool) {
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fn hit_test_in_list<'a, I>(point: Point2D<Au>,
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result: &mut Vec<DisplayItemMetadata>,
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topmost_only: bool,
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iterator: I)
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where I: Iterator<Item=&'a DisplayItem> {
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for item in iterator {
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// TODO(pcwalton): Use a precise algorithm here. This will allow us to properly hit
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// test elements with `border-radius`, for example.
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if !item.base().clip.might_intersect_point(&point) {
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// Clipped out.
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continue
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}
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if !geometry::rect_contains_point(item.bounds(), point) {
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// Can't possibly hit.
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continue
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}
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if item.base().metadata.pointing.is_none() {
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// `pointer-events` is `none`. Ignore this item.
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continue
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}
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if let DisplayItem::BorderClass(ref border) = *item {
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// If the point is inside the border, it didn't hit the border!
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let interior_rect =
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Rect::new(
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Point2D::new(border.base.bounds.origin.x +
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border.border_widths.left,
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border.base.bounds.origin.y +
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border.border_widths.top),
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Size2D::new(border.base.bounds.size.width -
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(border.border_widths.left +
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border.border_widths.right),
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border.base.bounds.size.height -
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(border.border_widths.top +
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border.border_widths.bottom)));
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if geometry::rect_contains_point(interior_rect, point) {
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continue
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}
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}
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// We found a hit!
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result.push(item.base().metadata);
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if topmost_only {
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return
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}
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}
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}
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// Layers are positioned on top of this layer should get a shot at the hit test first.
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for layer in self.layered_children.iter().rev() {
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layer.stacking_context.hit_test(point, result, topmost_only);
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Iterate through display items in reverse stacking order. Steps here refer to the
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// painting steps in CSS 2.1 Appendix E.
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//
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// Step 10: Outlines.
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hit_test_in_list(point, result, topmost_only, self.outlines.iter().rev());
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if topmost_only && !result.is_empty() {
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return
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}
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// Steps 9 and 8: Positioned descendants with nonnegative z-indices.
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for kid in self.children.iter().rev() {
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if kid.z_index < 0 {
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continue
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}
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kid.hit_test(point, result, topmost_only);
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Steps 8, 7, 5, and 4: Positioned content, content, floats, and block backgrounds and
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// borders.
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//
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// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.
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for display_list in &[
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&self.positioned_content,
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&self.content,
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&self.floats,
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&self.block_backgrounds_and_borders,
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] {
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hit_test_in_list(point, result, topmost_only, display_list.iter().rev());
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Step 3: Positioned descendants with negative z-indices.
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for kid in self.children.iter().rev() {
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if kid.z_index >= 0 {
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continue
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}
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kid.hit_test(point, result, topmost_only);
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Steps 2 and 1: Borders and background for the root.
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hit_test_in_list(point,
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result,
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topmost_only,
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self.background_and_borders.iter().rev())
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}
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}
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#[derive(HeapSizeOf, Deserialize, Serialize)]
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@ -489,128 +604,18 @@ impl StackingContext {
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/// the `pointer-events` CSS property If `topmost_only` is true, stops after placing one node
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/// into the list. `result` must be empty upon entry to this function.
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pub fn hit_test(&self,
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mut point: Point2D<Au>,
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point: Point2D<Au>,
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result: &mut Vec<DisplayItemMetadata>,
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topmost_only: bool) {
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fn hit_test_in_list<'a, I>(point: Point2D<Au>,
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result: &mut Vec<DisplayItemMetadata>,
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topmost_only: bool,
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iterator: I)
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where I: Iterator<Item=&'a DisplayItem> {
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for item in iterator {
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// TODO(pcwalton): Use a precise algorithm here. This will allow us to properly hit
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// test elements with `border-radius`, for example.
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if !item.base().clip.might_intersect_point(&point) {
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// Clipped out.
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continue
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}
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if !geometry::rect_contains_point(item.bounds(), point) {
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// Can't possibly hit.
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continue
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}
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if item.base().metadata.pointing.is_none() {
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// `pointer-events` is `none`. Ignore this item.
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continue
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}
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match *item {
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DisplayItem::BorderClass(ref border) => {
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// If the point is inside the border, it didn't hit the border!
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let interior_rect =
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Rect::new(
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Point2D::new(border.base.bounds.origin.x +
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border.border_widths.left,
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border.base.bounds.origin.y +
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border.border_widths.top),
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Size2D::new(border.base.bounds.size.width -
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(border.border_widths.left +
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border.border_widths.right),
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border.base.bounds.size.height -
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(border.border_widths.top +
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border.border_widths.bottom)));
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if geometry::rect_contains_point(interior_rect, point) {
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continue
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}
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}
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_ => {}
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}
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// We found a hit!
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result.push(item.base().metadata);
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if topmost_only {
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return
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}
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}
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}
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// Convert the point into stacking context local space
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point = point - self.bounds.origin;
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let point = point - self.bounds.origin;
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debug_assert!(!topmost_only || result.is_empty());
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let inv_transform = self.transform.invert();
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let frac_point = inv_transform.transform_point(&Point2D::new(point.x.to_f32_px(),
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point.y.to_f32_px()));
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point = Point2D::new(Au::from_f32_px(frac_point.x), Au::from_f32_px(frac_point.y));
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// Layers are positioned on top of this layer should get a shot at the hit test first.
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for layer in self.display_list.layered_children.iter().rev() {
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layer.stacking_context.hit_test(point, result, topmost_only);
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Iterate through display items in reverse stacking order. Steps here refer to the
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// painting steps in CSS 2.1 Appendix E.
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//
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// Step 10: Outlines.
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hit_test_in_list(point, result, topmost_only, self.display_list.outlines.iter().rev());
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if topmost_only && !result.is_empty() {
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return
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}
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// Steps 9 and 8: Positioned descendants with nonnegative z-indices.
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for kid in self.display_list.children.iter().rev() {
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if kid.z_index < 0 {
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continue
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}
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kid.hit_test(point, result, topmost_only);
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Steps 8, 7, 5, and 4: Positioned content, content, floats, and block backgrounds and
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// borders.
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//
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// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.
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for display_list in &[
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&self.display_list.positioned_content,
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&self.display_list.content,
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&self.display_list.floats,
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&self.display_list.block_backgrounds_and_borders,
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] {
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hit_test_in_list(point, result, topmost_only, display_list.iter().rev());
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Step 3: Positioned descendants with negative z-indices.
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for kid in self.display_list.children.iter().rev() {
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if kid.z_index >= 0 {
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continue
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}
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kid.hit_test(point, result, topmost_only);
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if topmost_only && !result.is_empty() {
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return
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}
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}
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// Steps 2 and 1: Borders and background for the root.
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hit_test_in_list(point,
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result,
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topmost_only,
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self.display_list.background_and_borders.iter().rev())
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let point = Point2D::new(Au::from_f32_px(frac_point.x), Au::from_f32_px(frac_point.y));
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self.display_list.hit_test(point, result, topmost_only)
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}
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pub fn print(&self, title: String) {
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