mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-31 14:15:30 +00:00
a8939590de
The bulk of this commit was generated by running:
run-clang-tidy.py \
-checks='-*,llvm-namespace-comment' \
-header-filter=^/.../mozilla-central/.* \
-fix
94 lines
4.2 KiB
C++
94 lines
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "ContentHelper.h"
|
|
|
|
#include "nsContainerFrame.h"
|
|
#include "nsIContent.h"
|
|
#include "nsIScrollableFrame.h"
|
|
#include "nsLayoutUtils.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "nsView.h"
|
|
|
|
namespace mozilla {
|
|
namespace widget {
|
|
|
|
void
|
|
ContentHelper::UpdateAllowedBehavior(uint32_t aTouchActionValue, bool aConsiderPanning, TouchBehaviorFlags& aOutBehavior)
|
|
{
|
|
if (aTouchActionValue != NS_STYLE_TOUCH_ACTION_AUTO) {
|
|
// Double-tap-zooming need property value AUTO
|
|
aOutBehavior &= ~AllowedTouchBehavior::DOUBLE_TAP_ZOOM;
|
|
if (aTouchActionValue != NS_STYLE_TOUCH_ACTION_MANIPULATION) {
|
|
// Pinch-zooming need value AUTO or MANIPULATION
|
|
aOutBehavior &= ~AllowedTouchBehavior::PINCH_ZOOM;
|
|
}
|
|
}
|
|
|
|
if (aConsiderPanning) {
|
|
if (aTouchActionValue == NS_STYLE_TOUCH_ACTION_NONE) {
|
|
aOutBehavior &= ~AllowedTouchBehavior::VERTICAL_PAN;
|
|
aOutBehavior &= ~AllowedTouchBehavior::HORIZONTAL_PAN;
|
|
}
|
|
|
|
// Values pan-x and pan-y set at the same time to the same element do not affect panning constraints.
|
|
// Therefore we need to check whether pan-x is set without pan-y and the same for pan-y.
|
|
if ((aTouchActionValue & NS_STYLE_TOUCH_ACTION_PAN_X) && !(aTouchActionValue & NS_STYLE_TOUCH_ACTION_PAN_Y)) {
|
|
aOutBehavior &= ~AllowedTouchBehavior::VERTICAL_PAN;
|
|
} else if ((aTouchActionValue & NS_STYLE_TOUCH_ACTION_PAN_Y) && !(aTouchActionValue & NS_STYLE_TOUCH_ACTION_PAN_X)) {
|
|
aOutBehavior &= ~AllowedTouchBehavior::HORIZONTAL_PAN;
|
|
}
|
|
}
|
|
}
|
|
|
|
ContentHelper::TouchBehaviorFlags
|
|
ContentHelper::GetAllowedTouchBehavior(nsIWidget* aWidget, const LayoutDeviceIntPoint& aPoint)
|
|
{
|
|
nsView *view = nsView::GetViewFor(aWidget);
|
|
nsIFrame *viewFrame = view->GetFrame();
|
|
|
|
nsPoint relativePoint =
|
|
nsLayoutUtils::GetEventCoordinatesRelativeTo(aWidget, aPoint, viewFrame);
|
|
|
|
nsIFrame *target = nsLayoutUtils::GetFrameForPoint(viewFrame, relativePoint, nsLayoutUtils::IGNORE_ROOT_SCROLL_FRAME);
|
|
nsIScrollableFrame *nearestScrollableParent = nsLayoutUtils::GetNearestScrollableFrame(target, 0);
|
|
nsIFrame* nearestScrollableFrame = do_QueryFrame(nearestScrollableParent);
|
|
|
|
// We're walking up the DOM tree until we meet the element with touch behavior and accumulating
|
|
// touch-action restrictions of all elements in this chain.
|
|
// The exact quote from the spec, that clarifies more:
|
|
// To determine the effect of a touch, find the nearest ancestor (starting from the element itself)
|
|
// that has a default touch behavior. Then examine the touch-action property of each element between
|
|
// the hit tested element and the element with the default touch behavior (including both the hit
|
|
// tested element and the element with the default touch behavior). If the touch-action property of
|
|
// any of those elements disallows the default touch behavior, do nothing. Otherwise allow the element
|
|
// to start considering the touch for the purposes of executing a default touch behavior.
|
|
|
|
// Currently we support only two touch behaviors: panning and zooming.
|
|
// For panning we walk up until we meet the first scrollable element (the element that supports panning)
|
|
// or root element.
|
|
// For zooming we walk up until the root element since Firefox currently supports only zooming of the
|
|
// root frame but not the subframes.
|
|
|
|
bool considerPanning = true;
|
|
TouchBehaviorFlags behavior = AllowedTouchBehavior::VERTICAL_PAN | AllowedTouchBehavior::HORIZONTAL_PAN |
|
|
AllowedTouchBehavior::PINCH_ZOOM | AllowedTouchBehavior::DOUBLE_TAP_ZOOM;
|
|
|
|
for (nsIFrame *frame = target; frame && frame->GetContent() && behavior; frame = frame->GetParent()) {
|
|
UpdateAllowedBehavior(nsLayoutUtils::GetTouchActionFromFrame(frame), considerPanning, behavior);
|
|
|
|
if (frame == nearestScrollableFrame) {
|
|
// We met the scrollable element, after it we shouldn't consider touch-action
|
|
// values for the purpose of panning but only for zooming.
|
|
considerPanning = false;
|
|
}
|
|
}
|
|
|
|
return behavior;
|
|
}
|
|
|
|
} // namespace widget
|
|
} // namespace mozilla
|