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gecko-dev/editor/libeditor/HTMLEditorObjectResizer.cpp

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/* -*- 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 "mozilla/HTMLEditor.h"
#include "HTMLEditorEventListener.h"
#include "HTMLEditUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/Preferences.h"
#include "mozilla/mozalloc.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/MouseEvent.h"
#include "mozilla/dom/EventTarget.h"
#include "nsAString.h"
#include "nsAlgorithm.h"
#include "nsCOMPtr.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsAtom.h"
#include "nsIContent.h"
#include "nsID.h"
#include "mozilla/dom/Document.h"
#include "nsIPresShell.h"
#include "nsISupportsUtils.h"
#include "nsPIDOMWindow.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include "nsStringFwd.h"
#include "nscore.h"
#include <algorithm>
#define kTopLeft NS_LITERAL_STRING("nw")
#define kTop NS_LITERAL_STRING("n")
#define kTopRight NS_LITERAL_STRING("ne")
#define kLeft NS_LITERAL_STRING("w")
#define kRight NS_LITERAL_STRING("e")
#define kBottomLeft NS_LITERAL_STRING("sw")
#define kBottom NS_LITERAL_STRING("s")
#define kBottomRight NS_LITERAL_STRING("se")
namespace mozilla {
using namespace dom;
/******************************************************************************
* mozilla::HTMLEditor
******************************************************************************/
ManualNACPtr HTMLEditor::CreateResizer(int16_t aLocation,
nsIContent& aParentContent) {
ManualNACPtr ret = CreateAnonymousElement(
nsGkAtoms::span, aParentContent, NS_LITERAL_STRING("mozResizer"), false);
if (NS_WARN_IF(!ret)) {
return nullptr;
}
// add the mouse listener so we can detect a click on a resizer
ret->AddEventListener(NS_LITERAL_STRING("mousedown"), mEventListener, true);
nsAutoString locationStr;
switch (aLocation) {
case nsIHTMLObjectResizer::eTopLeft:
locationStr = kTopLeft;
break;
case nsIHTMLObjectResizer::eTop:
locationStr = kTop;
break;
case nsIHTMLObjectResizer::eTopRight:
locationStr = kTopRight;
break;
case nsIHTMLObjectResizer::eLeft:
locationStr = kLeft;
break;
case nsIHTMLObjectResizer::eRight:
locationStr = kRight;
break;
case nsIHTMLObjectResizer::eBottomLeft:
locationStr = kBottomLeft;
break;
case nsIHTMLObjectResizer::eBottom:
locationStr = kBottom;
break;
case nsIHTMLObjectResizer::eBottomRight:
locationStr = kBottomRight;
break;
}
nsresult rv = ret->SetAttr(kNameSpaceID_None, nsGkAtoms::anonlocation,
locationStr, true);
NS_ENSURE_SUCCESS(rv, nullptr);
return ret;
}
ManualNACPtr HTMLEditor::CreateShadow(nsIContent& aParentContent,
Element& aOriginalObject) {
// let's create an image through the element factory
RefPtr<nsAtom> name;
if (HTMLEditUtils::IsImage(&aOriginalObject)) {
name = nsGkAtoms::img;
} else {
name = nsGkAtoms::span;
}
return CreateAnonymousElement(name, aParentContent,
NS_LITERAL_STRING("mozResizingShadow"), true);
}
ManualNACPtr HTMLEditor::CreateResizingInfo(nsIContent& aParentContent) {
// let's create an info box through the element factory
return CreateAnonymousElement(nsGkAtoms::span, aParentContent,
NS_LITERAL_STRING("mozResizingInfo"), true);
}
nsresult HTMLEditor::SetAllResizersPosition() {
if (NS_WARN_IF(!mTopLeftHandle)) {
return NS_ERROR_FAILURE; // There are no resizers.
}
int32_t x = mResizedObjectX;
int32_t y = mResizedObjectY;
int32_t w = mResizedObjectWidth;
int32_t h = mResizedObjectHeight;
nsAutoString value;
float resizerWidth, resizerHeight;
RefPtr<nsAtom> dummyUnit;
CSSEditUtils::GetComputedProperty(*mTopLeftHandle, *nsGkAtoms::width, value);
CSSEditUtils::ParseLength(value, &resizerWidth, getter_AddRefs(dummyUnit));
CSSEditUtils::GetComputedProperty(*mTopLeftHandle, *nsGkAtoms::height, value);
CSSEditUtils::ParseLength(value, &resizerHeight, getter_AddRefs(dummyUnit));
int32_t rw = static_cast<int32_t>((resizerWidth + 1) / 2);
int32_t rh = static_cast<int32_t>((resizerHeight + 1) / 2);
// While moving each resizer, mutation event listener may hide the resizers.
// And in worst case, new resizers may be recreated. So, we need to store
// all resizers here, and then, if we detect a resizer is removed or replaced,
// we should do nothing anymore.
// FYI: Note that only checking if mTopLeftHandle is replaced is enough.
// We're may be in hot path if user resizes an element a lot. So,
// we should just add-ref mTopLeftHandle.
RefPtr<Element> topLeftHandle = mTopLeftHandle.get();
SetAnonymousElementPosition(x - rw, y - rh, mTopLeftHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x + w / 2 - rw, y - rh, mTopHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x + w - rw - 1, y - rh, mTopRightHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x - rw, y + h / 2 - rh, mLeftHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x + w - rw - 1, y + h / 2 - rh, mRightHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x - rw, y + h - rh - 1, mBottomLeftHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x + w / 2 - rw, y + h - rh - 1, mBottomHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
SetAnonymousElementPosition(x + w - rw - 1, y + h - rh - 1,
mBottomRightHandle);
if (NS_WARN_IF(topLeftHandle != mTopLeftHandle)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
NS_IMETHODIMP
HTMLEditor::RefreshResizers() {
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = RefreshResizersInternal();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult HTMLEditor::RefreshResizersInternal() {
// Don't warn even if resizers are not visible since script cannot check
// if they are visible and this is non-virtual method. So, the cost of
// calling this can be ignored.
if (!mResizedObject) {
return NS_OK;
}
nsresult rv = GetPositionAndDimensions(
*mResizedObject, mResizedObjectX, mResizedObjectY, mResizedObjectWidth,
mResizedObjectHeight, mResizedObjectBorderLeft, mResizedObjectBorderTop,
mResizedObjectMarginLeft, mResizedObjectMarginTop);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
rv = SetAllResizersPosition();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
MOZ_ASSERT(
mResizingShadow,
"SetAllResizersPosition() should return error if resizers are hidden");
rv = SetShadowPosition(*mResizingShadow, *mResizedObject, mResizedObjectX,
mResizedObjectY);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult HTMLEditor::ShowResizersInternal(Element& aResizedElement) {
// When we have visible resizers, we cannot show new resizers.
// So, the caller should call HideResizersInternal() first if this
// returns error.
if (NS_WARN_IF(mResizedObject)) {
return NS_ERROR_UNEXPECTED;
}
nsCOMPtr<nsIContent> parentContent = aResizedElement.GetParent();
if (NS_WARN_IF(!parentContent)) {
return NS_ERROR_FAILURE;
}
if (NS_WARN_IF(!IsDescendantOfEditorRoot(&aResizedElement))) {
return NS_ERROR_UNEXPECTED;
}
// Let's create and setup resizers. If we failed something, we should
// cancel everything which we do in this method.
do {
mResizedObject = &aResizedElement;
// The resizers and the shadow will be anonymous siblings of the element.
// Note that creating a resizer or shadow may causes calling
// HideRisizersInternal() via a mutation event listener. So, we should
// store new resizer to a local variable, then, check:
// - whether creating resizer is already set to the member or not
// - whether resizing element is changed to another element
// If showing resizers are canceled, we hit the latter check.
// If resizers for another element is shown during this, we hit the latter
// check too.
// If resizers are just shown again for same element, we hit the former
// check.
ManualNACPtr newResizer =
CreateResizer(nsIHTMLObjectResizer::eTopLeft, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mTopLeftHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
// Don't hide current resizers in this case because they are not what
// we're creating.
return NS_ERROR_FAILURE;
}
mTopLeftHandle = std::move(newResizer);
newResizer = CreateResizer(nsIHTMLObjectResizer::eTop, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mTopHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mTopHandle = std::move(newResizer);
newResizer = CreateResizer(nsIHTMLObjectResizer::eTopRight, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mTopRightHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mTopRightHandle = std::move(newResizer);
newResizer = CreateResizer(nsIHTMLObjectResizer::eLeft, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mLeftHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mLeftHandle = std::move(newResizer);
newResizer = CreateResizer(nsIHTMLObjectResizer::eRight, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mRightHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mRightHandle = std::move(newResizer);
newResizer =
CreateResizer(nsIHTMLObjectResizer::eBottomLeft, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mBottomLeftHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mBottomLeftHandle = std::move(newResizer);
newResizer = CreateResizer(nsIHTMLObjectResizer::eBottom, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mBottomHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mBottomHandle = std::move(newResizer);
newResizer =
CreateResizer(nsIHTMLObjectResizer::eBottomRight, *parentContent);
if (NS_WARN_IF(!newResizer)) {
break;
}
if (NS_WARN_IF(mBottomRightHandle) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mBottomRightHandle = std::move(newResizer);
// Store the last resizer which we created. This is useful when we
// need to check whether our resizers are hiddedn and recreated another
// set of resizers or not.
RefPtr<Element> createdBottomRightNalde = mBottomRightHandle.get();
nsresult rv = GetPositionAndDimensions(
aResizedElement, mResizedObjectX, mResizedObjectY, mResizedObjectWidth,
mResizedObjectHeight, mResizedObjectBorderLeft, mResizedObjectBorderTop,
mResizedObjectMarginLeft, mResizedObjectMarginTop);
if (NS_WARN_IF(NS_FAILED(rv))) {
break;
}
// and let's set their absolute positions in the document
rv = SetAllResizersPosition();
if (NS_WARN_IF(NS_FAILED(rv))) {
if (NS_WARN_IF(mBottomRightHandle.get() != createdBottomRightNalde)) {
return NS_ERROR_FAILURE;
}
break;
}
// now, let's create the resizing shadow
ManualNACPtr newShadow = CreateShadow(*parentContent, aResizedElement);
if (NS_WARN_IF(!newShadow)) {
break;
}
if (NS_WARN_IF(mResizingShadow) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mResizingShadow = std::move(newShadow);
// and set its position
rv = SetShadowPosition(*mResizingShadow, aResizedElement, mResizedObjectX,
mResizedObjectY);
if (NS_WARN_IF(NS_FAILED(rv))) {
if (NS_WARN_IF(mBottomRightHandle.get() != createdBottomRightNalde)) {
return NS_ERROR_FAILURE;
}
break;
}
// and then the resizing info tooltip
ManualNACPtr newResizingInfo = CreateResizingInfo(*parentContent);
if (NS_WARN_IF(!newResizingInfo)) {
break;
}
if (NS_WARN_IF(mResizingInfo) ||
NS_WARN_IF(mResizedObject != &aResizedElement)) {
return NS_ERROR_FAILURE;
}
mResizingInfo = std::move(newResizingInfo);
// and listen to the "resize" event on the window first, get the
// window from the document...
if (NS_WARN_IF(!mEventListener)) {
break;
}
rv = static_cast<HTMLEditorEventListener*>(mEventListener.get())
->ListenToWindowResizeEvent(true);
if (NS_WARN_IF(NS_FAILED(rv))) {
break;
}
MOZ_ASSERT(mResizedObject == &aResizedElement);
mHasShownResizers = true;
// XXX Even when it failed to add event listener, should we need to set
// _moz_resizing attribute?
aResizedElement.SetAttr(kNameSpaceID_None, nsGkAtoms::_moz_resizing,
NS_LITERAL_STRING("true"), true);
return NS_OK;
} while (true);
DebugOnly<nsresult> rv = HideResizersInternal();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"Failed to clean up unnecessary resizers");
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
HTMLEditor::HideResizers() {
AutoEditActionDataSetter editActionData(*this, EditAction::eNotEditing);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = HideResizersInternal();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult HTMLEditor::HideResizersInternal() {
// Don't warn even if resizers are visible since script cannot check
// if they are visible and this is non-virtual method. So, the cost of
// calling this can be ignored.
if (!mResizedObject) {
return NS_OK;
}
// get the presshell's document observer interface.
nsCOMPtr<nsIPresShell> presShell = GetPresShell();
NS_WARNING_ASSERTION(presShell, "There is no presShell");
// We allow the pres shell to be null; when it is, we presume there
// are no document observers to notify, but we still want to
// UnbindFromTree.
NS_NAMED_LITERAL_STRING(mousedown, "mousedown");
// HTMLEditor should forget all members related to resizers first since
// removing a part of UI may cause showing the resizers again. In such
// case, the members may be overwritten by ShowResizers() and this will
// lose the chance to release the old resizers.
ManualNACPtr topLeftHandle(std::move(mTopLeftHandle));
ManualNACPtr topHandle(std::move(mTopHandle));
ManualNACPtr topRightHandle(std::move(mTopRightHandle));
ManualNACPtr leftHandle(std::move(mLeftHandle));
ManualNACPtr rightHandle(std::move(mRightHandle));
ManualNACPtr bottomLeftHandle(std::move(mBottomLeftHandle));
ManualNACPtr bottomHandle(std::move(mBottomHandle));
ManualNACPtr bottomRightHandle(std::move(mBottomRightHandle));
ManualNACPtr resizingShadow(std::move(mResizingShadow));
ManualNACPtr resizingInfo(std::move(mResizingInfo));
RefPtr<Element> activatedHandle(std::move(mActivatedHandle));
RefPtr<Element> resizedObject(std::move(mResizedObject));
// Remvoe all handles.
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(topLeftHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(topHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(topRightHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(leftHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(rightHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(bottomLeftHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(bottomHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(bottomRightHandle), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(resizingShadow), presShell);
RemoveListenerAndDeleteRef(mousedown, mEventListener, true,
std::move(resizingInfo), presShell);
// Remove active state of a resizer.
if (activatedHandle) {
activatedHandle->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_moz_activated,
true);
}
// Remove resizing state of the target element.
resizedObject->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_moz_resizing, true);
if (!mEventListener) {
return NS_OK;
}
nsresult rv = static_cast<HTMLEditorEventListener*>(mEventListener.get())
->ListenToMouseMoveEventForResizers(false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Remove resize event listener from the window.
if (!mEventListener) {
return NS_OK;
}
rv = static_cast<HTMLEditorEventListener*>(mEventListener.get())
->ListenToWindowResizeEvent(false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
void HTMLEditor::HideShadowAndInfo() {
if (mResizingShadow) {
mResizingShadow->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("hidden"), true);
}
if (mResizingInfo) {
mResizingInfo->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("hidden"), true);
}
}
nsresult HTMLEditor::StartResizing(Element* aHandle) {
mIsResizing = true;
mActivatedHandle = aHandle;
NS_ENSURE_STATE(mActivatedHandle || !aHandle);
mActivatedHandle->SetAttr(kNameSpaceID_None, nsGkAtoms::_moz_activated,
NS_LITERAL_STRING("true"), true);
// do we want to preserve ratio or not?
bool preserveRatio =
HTMLEditUtils::IsImage(mResizedObject) &&
Preferences::GetBool("editor.resizing.preserve_ratio", true);
// the way we change the position/size of the shadow depends on
// the handle
nsAutoString locationStr;
mActivatedHandle->GetAttribute(NS_LITERAL_STRING("anonlocation"),
locationStr);
if (locationStr.Equals(kTopLeft)) {
SetResizeIncrements(1, 1, -1, -1, preserveRatio);
} else if (locationStr.Equals(kTop)) {
SetResizeIncrements(0, 1, 0, -1, false);
} else if (locationStr.Equals(kTopRight)) {
SetResizeIncrements(0, 1, 1, -1, preserveRatio);
} else if (locationStr.Equals(kLeft)) {
SetResizeIncrements(1, 0, -1, 0, false);
} else if (locationStr.Equals(kRight)) {
SetResizeIncrements(0, 0, 1, 0, false);
} else if (locationStr.Equals(kBottomLeft)) {
SetResizeIncrements(1, 0, -1, 1, preserveRatio);
} else if (locationStr.Equals(kBottom)) {
SetResizeIncrements(0, 0, 0, 1, false);
} else if (locationStr.Equals(kBottomRight)) {
SetResizeIncrements(0, 0, 1, 1, preserveRatio);
}
// make the shadow appear
mResizingShadow->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_class, true);
// position it
mCSSEditUtils->SetCSSPropertyPixels(*mResizingShadow, *nsGkAtoms::width,
mResizedObjectWidth);
mCSSEditUtils->SetCSSPropertyPixels(*mResizingShadow, *nsGkAtoms::height,
mResizedObjectHeight);
// add a mouse move listener to the editor
if (NS_WARN_IF(!mEventListener)) {
return NS_ERROR_NOT_INITIALIZED;
}
nsresult rv = static_cast<HTMLEditorEventListener*>(mEventListener.get())
->ListenToMouseMoveEventForResizers(true);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult HTMLEditor::OnMouseDown(int32_t aClientX, int32_t aClientY,
Element* aTarget, Event* aEvent) {
NS_ENSURE_ARG_POINTER(aTarget);
nsAutoString anonclass;
aTarget->GetAttribute(NS_LITERAL_STRING("_moz_anonclass"), anonclass);
if (anonclass.EqualsLiteral("mozResizer")) {
AutoEditActionDataSetter editActionData(*this, EditAction::eResizeElement);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
// If we have an anonymous element and that element is a resizer,
// let's start resizing!
aEvent->PreventDefault();
mResizerUsedCount++;
mOriginalX = aClientX;
mOriginalY = aClientY;
return StartResizing(aTarget);
}
if (anonclass.EqualsLiteral("mozGrabber")) {
AutoEditActionDataSetter editActionData(*this, EditAction::eMoveElement);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
// If we have an anonymous element and that element is a grabber,
// let's start moving the element!
mGrabberUsedCount++;
mOriginalX = aClientX;
mOriginalY = aClientY;
return GrabberClicked();
}
return NS_OK;
}
nsresult HTMLEditor::OnMouseUp(int32_t aClientX, int32_t aClientY,
Element* aTarget) {
if (mIsResizing) {
AutoEditActionDataSetter editActionData(*this, EditAction::eResizeElement);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
// we are resizing and release the mouse button, so let's
// end the resizing process
mIsResizing = false;
HideShadowAndInfo();
SetFinalSize(aClientX, aClientY);
} else if (mIsMoving || mGrabberClicked) {
AutoEditActionDataSetter editActionData(*this, EditAction::eMoveElement);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
if (mIsMoving) {
mPositioningShadow->SetAttr(kNameSpaceID_None, nsGkAtoms::_class,
NS_LITERAL_STRING("hidden"), true);
SetFinalPosition(aClientX, aClientY);
}
if (mGrabberClicked) {
EndMoving();
}
}
return NS_OK;
}
void HTMLEditor::SetResizeIncrements(int32_t aX, int32_t aY, int32_t aW,
int32_t aH, bool aPreserveRatio) {
mXIncrementFactor = aX;
mYIncrementFactor = aY;
mWidthIncrementFactor = aW;
mHeightIncrementFactor = aH;
mPreserveRatio = aPreserveRatio;
}
nsresult HTMLEditor::SetResizingInfoPosition(int32_t aX, int32_t aY, int32_t aW,
int32_t aH) {
// Determine the position of the resizing info box based upon the new
// position and size of the element (aX, aY, aW, aH), and which
// resizer is the "activated handle". For example, place the resizing
// info box at the bottom-right corner of the new element, if the element
// is being resized by the bottom-right resizer.
int32_t infoXPosition;
int32_t infoYPosition;
if (mActivatedHandle == mTopLeftHandle || mActivatedHandle == mLeftHandle ||
mActivatedHandle == mBottomLeftHandle) {
infoXPosition = aX;
} else if (mActivatedHandle == mTopHandle ||
mActivatedHandle == mBottomHandle) {
infoXPosition = aX + (aW / 2);
} else {
// should only occur when mActivatedHandle is one of the 3 right-side
// handles, but this is a reasonable default if it isn't any of them (?)
infoXPosition = aX + aW;
}
if (mActivatedHandle == mTopLeftHandle || mActivatedHandle == mTopHandle ||
mActivatedHandle == mTopRightHandle) {
infoYPosition = aY;
} else if (mActivatedHandle == mLeftHandle ||
mActivatedHandle == mRightHandle) {
infoYPosition = aY + (aH / 2);
} else {
// should only occur when mActivatedHandle is one of the 3 bottom-side
// handles, but this is a reasonable default if it isn't any of them (?)
infoYPosition = aY + aH;
}
// Offset info box by 20 so it's not directly under the mouse cursor.
const int mouseCursorOffset = 20;
mCSSEditUtils->SetCSSPropertyPixels(*mResizingInfo, *nsGkAtoms::left,
infoXPosition + mouseCursorOffset);
mCSSEditUtils->SetCSSPropertyPixels(*mResizingInfo, *nsGkAtoms::top,
infoYPosition + mouseCursorOffset);
nsCOMPtr<nsIContent> textInfo = mResizingInfo->GetFirstChild();
ErrorResult erv;
if (textInfo) {
mResizingInfo->RemoveChild(*textInfo, erv);
NS_ENSURE_TRUE(!erv.Failed(), erv.StealNSResult());
textInfo = nullptr;
}
nsAutoString widthStr, heightStr, diffWidthStr, diffHeightStr;
widthStr.AppendInt(aW);
heightStr.AppendInt(aH);
int32_t diffWidth = aW - mResizedObjectWidth;
int32_t diffHeight = aH - mResizedObjectHeight;
if (diffWidth > 0) {
diffWidthStr.Assign('+');
}
if (diffHeight > 0) {
diffHeightStr.Assign('+');
}
diffWidthStr.AppendInt(diffWidth);
diffHeightStr.AppendInt(diffHeight);
nsAutoString info(widthStr + NS_LITERAL_STRING(" x ") + heightStr +
NS_LITERAL_STRING(" (") + diffWidthStr +
NS_LITERAL_STRING(", ") + diffHeightStr +
NS_LITERAL_STRING(")"));
RefPtr<Document> doc = GetDocument();
textInfo = doc->CreateTextNode(info);
if (NS_WARN_IF(!textInfo)) {
return NS_ERROR_FAILURE;
}
mResizingInfo->AppendChild(*textInfo, erv);
if (NS_WARN_IF(erv.Failed())) {
return erv.StealNSResult();
}
return mResizingInfo->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_class, true);
}
nsresult HTMLEditor::SetShadowPosition(Element& aShadowElement,
Element& aElement, int32_t aElementX,
int32_t aElementY) {
MOZ_ASSERT(&aShadowElement == mResizingShadow ||
&aShadowElement == mPositioningShadow);
RefPtr<Element> handlingShadowElement = &aShadowElement == mResizingShadow
? mResizingShadow.get()
: mPositioningShadow.get();
SetAnonymousElementPosition(aElementX, aElementY, &aShadowElement);
if (NS_WARN_IF(&aShadowElement != handlingShadowElement)) {
return NS_ERROR_FAILURE;
}
if (!HTMLEditUtils::IsImage(&aElement)) {
return NS_OK;
}
nsAutoString imageSource;
aElement.GetAttr(kNameSpaceID_None, nsGkAtoms::src, imageSource);
nsresult rv = aShadowElement.SetAttr(kNameSpaceID_None, nsGkAtoms::src,
imageSource, true);
if (NS_WARN_IF(NS_FAILED(rv)) ||
NS_WARN_IF(&aShadowElement != handlingShadowElement)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
int32_t HTMLEditor::GetNewResizingIncrement(int32_t aX, int32_t aY,
ResizeAt aResizeAt) {
int32_t result = 0;
if (!mPreserveRatio) {
switch (aResizeAt) {
case ResizeAt::eX:
case ResizeAt::eWidth:
result = aX - mOriginalX;
break;
case ResizeAt::eY:
case ResizeAt::eHeight:
result = aY - mOriginalY;
break;
default:
MOZ_ASSERT_UNREACHABLE("Invalid resizing request");
}
return result;
}
int32_t xi = (aX - mOriginalX) * mWidthIncrementFactor;
int32_t yi = (aY - mOriginalY) * mHeightIncrementFactor;
float objectSizeRatio =
((float)mResizedObjectWidth) / ((float)mResizedObjectHeight);
result = (xi > yi) ? xi : yi;
switch (aResizeAt) {
case ResizeAt::eX:
case ResizeAt::eWidth:
if (result == yi) result = (int32_t)(((float)result) * objectSizeRatio);
result = (int32_t)(((float)result) * mWidthIncrementFactor);
break;
case ResizeAt::eY:
case ResizeAt::eHeight:
if (result == xi) result = (int32_t)(((float)result) / objectSizeRatio);
result = (int32_t)(((float)result) * mHeightIncrementFactor);
break;
}
return result;
}
int32_t HTMLEditor::GetNewResizingX(int32_t aX, int32_t aY) {
int32_t resized =
mResizedObjectX +
GetNewResizingIncrement(aX, aY, ResizeAt::eX) * mXIncrementFactor;
int32_t max = mResizedObjectX + mResizedObjectWidth;
return std::min(resized, max);
}
int32_t HTMLEditor::GetNewResizingY(int32_t aX, int32_t aY) {
int32_t resized =
mResizedObjectY +
GetNewResizingIncrement(aX, aY, ResizeAt::eY) * mYIncrementFactor;
int32_t max = mResizedObjectY + mResizedObjectHeight;
return std::min(resized, max);
}
int32_t HTMLEditor::GetNewResizingWidth(int32_t aX, int32_t aY) {
int32_t resized =
mResizedObjectWidth +
GetNewResizingIncrement(aX, aY, ResizeAt::eWidth) * mWidthIncrementFactor;
return std::max(resized, 1);
}
int32_t HTMLEditor::GetNewResizingHeight(int32_t aX, int32_t aY) {
int32_t resized = mResizedObjectHeight +
GetNewResizingIncrement(aX, aY, ResizeAt::eHeight) *
mHeightIncrementFactor;
return std::max(resized, 1);
}
nsresult HTMLEditor::OnMouseMove(MouseEvent* aMouseEvent) {
MOZ_ASSERT(aMouseEvent);
if (mIsResizing) {
AutoEditActionDataSetter editActionData(*this, EditAction::eResizeElement);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
// we are resizing and the mouse pointer's position has changed
// we have to resdisplay the shadow
int32_t clientX = aMouseEvent->ClientX();
int32_t clientY = aMouseEvent->ClientY();
int32_t newX = GetNewResizingX(clientX, clientY);
int32_t newY = GetNewResizingY(clientX, clientY);
int32_t newWidth = GetNewResizingWidth(clientX, clientY);
int32_t newHeight = GetNewResizingHeight(clientX, clientY);
mCSSEditUtils->SetCSSPropertyPixels(*mResizingShadow, *nsGkAtoms::left,
newX);
mCSSEditUtils->SetCSSPropertyPixels(*mResizingShadow, *nsGkAtoms::top,
newY);
mCSSEditUtils->SetCSSPropertyPixels(*mResizingShadow, *nsGkAtoms::width,
newWidth);
mCSSEditUtils->SetCSSPropertyPixels(*mResizingShadow, *nsGkAtoms::height,
newHeight);
return SetResizingInfoPosition(newX, newY, newWidth, newHeight);
}
AutoEditActionDataSetter editActionData(*this, EditAction::eMoveElement);
if (NS_WARN_IF(!editActionData.CanHandle())) {
return NS_ERROR_NOT_INITIALIZED;
}
if (mGrabberClicked) {
int32_t clientX = aMouseEvent->ClientX();
int32_t clientY = aMouseEvent->ClientY();
int32_t xThreshold =
LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdX, 1);
int32_t yThreshold =
LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdY, 1);
if (DeprecatedAbs(clientX - mOriginalX) * 2 >= xThreshold ||
DeprecatedAbs(clientY - mOriginalY) * 2 >= yThreshold) {
mGrabberClicked = false;
StartMoving();
}
}
if (mIsMoving) {
int32_t clientX = aMouseEvent->ClientX();
int32_t clientY = aMouseEvent->ClientY();
int32_t newX = mPositionedObjectX + clientX - mOriginalX;
int32_t newY = mPositionedObjectY + clientY - mOriginalY;
SnapToGrid(newX, newY);
mCSSEditUtils->SetCSSPropertyPixels(*mPositioningShadow, *nsGkAtoms::left,
newX);
mCSSEditUtils->SetCSSPropertyPixels(*mPositioningShadow, *nsGkAtoms::top,
newY);
}
return NS_OK;
}
void HTMLEditor::SetFinalSize(int32_t aX, int32_t aY) {
if (!mResizedObject) {
// paranoia
return;
}
if (mActivatedHandle) {
mActivatedHandle->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_moz_activated,
true);
mActivatedHandle = nullptr;
}
// we have now to set the new width and height of the resized object
// we don't set the x and y position because we don't control that in
// a normal HTML layout
int32_t left = GetNewResizingX(aX, aY);
int32_t top = GetNewResizingY(aX, aY);
int32_t width = GetNewResizingWidth(aX, aY);
int32_t height = GetNewResizingHeight(aX, aY);
bool setWidth =
!mResizedObjectIsAbsolutelyPositioned || (width != mResizedObjectWidth);
bool setHeight =
!mResizedObjectIsAbsolutelyPositioned || (height != mResizedObjectHeight);
int32_t x, y;
x = left - ((mResizedObjectIsAbsolutelyPositioned)
? mResizedObjectBorderLeft + mResizedObjectMarginLeft
: 0);
y = top - ((mResizedObjectIsAbsolutelyPositioned)
? mResizedObjectBorderTop + mResizedObjectMarginTop
: 0);
// we want one transaction only from a user's point of view
AutoPlaceholderBatch treatAsOneTransaction(*this);
if (mResizedObjectIsAbsolutelyPositioned) {
if (setHeight) {
mCSSEditUtils->SetCSSPropertyPixels(*mResizedObject, *nsGkAtoms::top, y);
}
if (setWidth) {
mCSSEditUtils->SetCSSPropertyPixels(*mResizedObject, *nsGkAtoms::left, x);
}
}
if (IsCSSEnabled() || mResizedObjectIsAbsolutelyPositioned) {
if (setWidth &&
mResizedObject->HasAttr(kNameSpaceID_None, nsGkAtoms::width)) {
RemoveAttributeWithTransaction(*mResizedObject, *nsGkAtoms::width);
}
if (setHeight &&
mResizedObject->HasAttr(kNameSpaceID_None, nsGkAtoms::height)) {
RemoveAttributeWithTransaction(*mResizedObject, *nsGkAtoms::height);
}
if (setWidth) {
mCSSEditUtils->SetCSSPropertyPixels(*mResizedObject, *nsGkAtoms::width,
width);
}
if (setHeight) {
mCSSEditUtils->SetCSSPropertyPixels(*mResizedObject, *nsGkAtoms::height,
height);
}
} else {
// we use HTML size and remove all equivalent CSS properties
// we set the CSS width and height to remove it later,
// triggering an immediate reflow; otherwise, we have problems
// with asynchronous reflow
if (setWidth) {
mCSSEditUtils->SetCSSPropertyPixels(*mResizedObject, *nsGkAtoms::width,
width);
}
if (setHeight) {
mCSSEditUtils->SetCSSPropertyPixels(*mResizedObject, *nsGkAtoms::height,
height);
}
if (setWidth) {
nsAutoString w;
w.AppendInt(width);
SetAttributeWithTransaction(*mResizedObject, *nsGkAtoms::width, w);
}
if (setHeight) {
nsAutoString h;
h.AppendInt(height);
SetAttributeWithTransaction(*mResizedObject, *nsGkAtoms::height, h);
}
if (setWidth) {
mCSSEditUtils->RemoveCSSProperty(*mResizedObject, *nsGkAtoms::width,
EmptyString());
}
if (setHeight) {
mCSSEditUtils->RemoveCSSProperty(*mResizedObject, *nsGkAtoms::height,
EmptyString());
}
}
// keep track of that size
mResizedObjectWidth = width;
mResizedObjectHeight = height;
DebugOnly<nsresult> rv = RefreshResizersInternal();
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed ot refresh resizers");
}
NS_IMETHODIMP
HTMLEditor::GetObjectResizingEnabled(bool* aIsObjectResizingEnabled) {
*aIsObjectResizingEnabled = IsObjectResizerEnabled();
return NS_OK;
}
NS_IMETHODIMP
HTMLEditor::SetObjectResizingEnabled(bool aObjectResizingEnabled) {
EnableObjectResizer(aObjectResizingEnabled);
return NS_OK;
}
#undef kTopLeft
#undef kTop
#undef kTopRight
#undef kLeft
#undef kRight
#undef kBottomLeft
#undef kBottom
#undef kBottomRight
} // namespace mozilla
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