gecko-dev/dom/events/WheelEvent.cpp

218 lines
6.3 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "mozilla/dom/WheelEvent.h"
#include "mozilla/MouseEvents.h"
#include "prtime.h"
namespace mozilla {
namespace dom {
WheelEvent::WheelEvent(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetWheelEvent* aWheelEvent)
: MouseEvent(aOwner, aPresContext,
aWheelEvent ? aWheelEvent :
new WidgetWheelEvent(false, 0, nullptr))
, mAppUnitsPerDevPixel(0)
{
if (aWheelEvent) {
mEventIsInternal = false;
// If the delta mode is pixel, the WidgetWheelEvent's delta values are in
// device pixels. However, JS contents need the delta values in CSS pixels.
// We should store the value of mAppUnitsPerDevPixel here because
// it might be changed by changing zoom or something.
if (aWheelEvent->deltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
mAppUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
}
} else {
mEventIsInternal = true;
mEvent->time = PR_Now();
mEvent->refPoint.x = mEvent->refPoint.y = 0;
mEvent->AsWheelEvent()->inputSource = nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
}
}
NS_IMPL_ADDREF_INHERITED(WheelEvent, MouseEvent)
NS_IMPL_RELEASE_INHERITED(WheelEvent, MouseEvent)
NS_INTERFACE_MAP_BEGIN(WheelEvent)
NS_INTERFACE_MAP_ENTRY(nsIDOMWheelEvent)
NS_INTERFACE_MAP_END_INHERITING(MouseEvent)
NS_IMETHODIMP
WheelEvent::InitWheelEvent(const nsAString& aType,
bool aCanBubble,
bool aCancelable,
nsIDOMWindow* aView,
int32_t aDetail,
int32_t aScreenX,
int32_t aScreenY,
int32_t aClientX,
int32_t aClientY,
uint16_t aButton,
nsIDOMEventTarget* aRelatedTarget,
const nsAString& aModifiersList,
double aDeltaX,
double aDeltaY,
double aDeltaZ,
uint32_t aDeltaMode)
{
nsresult rv =
MouseEvent::InitMouseEvent(aType, aCanBubble, aCancelable, aView, aDetail,
aScreenX, aScreenY, aClientX, aClientY, aButton,
aRelatedTarget, aModifiersList);
NS_ENSURE_SUCCESS(rv, rv);
WidgetWheelEvent* wheelEvent = mEvent->AsWheelEvent();
wheelEvent->deltaX = aDeltaX;
wheelEvent->deltaY = aDeltaY;
wheelEvent->deltaZ = aDeltaZ;
wheelEvent->deltaMode = aDeltaMode;
return NS_OK;
}
double
WheelEvent::DeltaX()
{
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->deltaX;
}
return mEvent->AsWheelEvent()->deltaX *
mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();
}
NS_IMETHODIMP
WheelEvent::GetDeltaX(double* aDeltaX)
{
NS_ENSURE_ARG_POINTER(aDeltaX);
*aDeltaX = DeltaX();
return NS_OK;
}
double
WheelEvent::DeltaY()
{
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->deltaY;
}
return mEvent->AsWheelEvent()->deltaY *
mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();
}
NS_IMETHODIMP
WheelEvent::GetDeltaY(double* aDeltaY)
{
NS_ENSURE_ARG_POINTER(aDeltaY);
*aDeltaY = DeltaY();
return NS_OK;
}
double
WheelEvent::DeltaZ()
{
if (!mAppUnitsPerDevPixel) {
return mEvent->AsWheelEvent()->deltaZ;
}
return mEvent->AsWheelEvent()->deltaZ *
mAppUnitsPerDevPixel / nsPresContext::AppUnitsPerCSSPixel();
}
NS_IMETHODIMP
WheelEvent::GetDeltaZ(double* aDeltaZ)
{
NS_ENSURE_ARG_POINTER(aDeltaZ);
*aDeltaZ = DeltaZ();
return NS_OK;
}
uint32_t
WheelEvent::DeltaMode()
{
return mEvent->AsWheelEvent()->deltaMode;
}
NS_IMETHODIMP
WheelEvent::GetDeltaMode(uint32_t* aDeltaMode)
{
NS_ENSURE_ARG_POINTER(aDeltaMode);
*aDeltaMode = DeltaMode();
return NS_OK;
}
static void
GetModifierList(bool aCtrl, bool aShift, bool aAlt, bool aMeta,
nsAString& aModifierList)
{
if (aCtrl) {
aModifierList.AppendLiteral(NS_DOM_KEYNAME_CONTROL);
}
if (aShift) {
if (!aModifierList.IsEmpty()) {
aModifierList.AppendLiteral(" ");
}
aModifierList.AppendLiteral(NS_DOM_KEYNAME_SHIFT);
}
if (aAlt) {
if (!aModifierList.IsEmpty()) {
aModifierList.AppendLiteral(" ");
}
aModifierList.AppendLiteral(NS_DOM_KEYNAME_ALT);
}
if (aMeta) {
if (!aModifierList.IsEmpty()) {
aModifierList.AppendLiteral(" ");
}
aModifierList.AppendLiteral(NS_DOM_KEYNAME_META);
}
}
already_AddRefed<WheelEvent>
WheelEvent::Constructor(const GlobalObject& aGlobal,
const nsAString& aType,
const WheelEventInit& aParam,
ErrorResult& aRv)
{
nsCOMPtr<EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
nsRefPtr<WheelEvent> e = new WheelEvent(t, nullptr, nullptr);
bool trusted = e->Init(t);
nsAutoString modifierList;
GetModifierList(aParam.mCtrlKey, aParam.mShiftKey,
aParam.mAltKey, aParam.mMetaKey,
modifierList);
aRv = e->InitWheelEvent(aType, aParam.mBubbles, aParam.mCancelable,
aParam.mView, aParam.mDetail,
aParam.mScreenX, aParam.mScreenY,
aParam.mClientX, aParam.mClientY,
aParam.mButton, aParam.mRelatedTarget,
modifierList, aParam.mDeltaX,
aParam.mDeltaY, aParam.mDeltaZ, aParam.mDeltaMode);
e->mEvent->AsWheelEvent()->buttons = aParam.mButtons;
e->SetTrusted(trusted);
return e.forget();
}
} // namespace dom
} // namespace mozilla
using namespace mozilla;
using namespace mozilla::dom;
nsresult
NS_NewDOMWheelEvent(nsIDOMEvent** aInstancePtrResult,
EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetWheelEvent* aEvent)
{
WheelEvent* it = new WheelEvent(aOwner, aPresContext, aEvent);
return CallQueryInterface(it, aInstancePtrResult);
}