зеркало из https://github.com/mozilla/pjs.git
301 строка
11 KiB
C++
301 строка
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SMIL module.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Daniel Holbert <dholbert@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* representation of a SMIL-animatable CSS property on an element */
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#include "nsSMILCSSProperty.h"
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#include "nsSMILCSSValueType.h"
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#include "nsSMILValue.h"
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#include "nsCSSDeclaration.h"
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#include "nsComputedDOMStyle.h"
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#include "nsStyleAnimation.h"
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#include "nsIContent.h"
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#include "nsIDOMElement.h"
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using namespace mozilla::dom;
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// Helper function
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static PRBool
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GetCSSComputedValue(nsIContent* aElem,
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nsCSSProperty aPropID,
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nsAString& aResult)
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{
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NS_ABORT_IF_FALSE(!nsCSSProps::IsShorthand(aPropID),
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"Can't look up computed value of shorthand property");
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NS_ABORT_IF_FALSE(nsSMILCSSProperty::IsPropertyAnimatable(aPropID),
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"Shouldn't get here for non-animatable properties");
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nsIDocument* doc = aElem->GetCurrentDoc();
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if (!doc) {
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// This can happen if we process certain types of restyles mid-sample
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// and remove anonymous animated content from the document as a result.
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// See bug 534975.
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return PR_FALSE;
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}
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nsIPresShell* shell = doc->GetPrimaryShell();
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if (!shell) {
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NS_WARNING("Unable to look up computed style -- no pres shell");
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return PR_FALSE;
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}
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nsRefPtr<nsComputedDOMStyle> computedStyle;
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nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(aElem));
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nsresult rv = NS_NewComputedDOMStyle(domElement, EmptyString(), shell,
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getter_AddRefs(computedStyle));
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if (NS_SUCCEEDED(rv)) {
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computedStyle->GetPropertyValue(aPropID, aResult);
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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// Class Methods
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nsSMILCSSProperty::nsSMILCSSProperty(nsCSSProperty aPropID,
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Element* aElement)
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: mPropID(aPropID), mElement(aElement)
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{
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NS_ABORT_IF_FALSE(IsPropertyAnimatable(mPropID),
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"Creating a nsSMILCSSProperty for a property "
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"that's not supported for animation");
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}
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nsSMILValue
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nsSMILCSSProperty::GetBaseValue() const
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{
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// To benefit from Return Value Optimization and avoid copy constructor calls
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// due to our use of return-by-value, we must return the exact same object
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// from ALL return points. This function must only return THIS variable:
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nsSMILValue baseValue;
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// SPECIAL CASE: Shorthands
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if (nsCSSProps::IsShorthand(mPropID)) {
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// We can't look up the base (computed-style) value of shorthand
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// properties, because they aren't guaranteed to have a consistent computed
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// value. However, that's not a problem, because it turns out the caller
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// isn't going to end up using the value we return anyway. Base values only
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// get used when there's interpolation or addition, and the shorthand
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// properties we know about don't support those operations. So, we can just
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// return a dummy value (initialized with the right type, so as not to
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// indicate failure).
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nsSMILValue tmpVal(&nsSMILCSSValueType::sSingleton);
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baseValue.Swap(tmpVal);
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return baseValue;
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}
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// GENERAL CASE: Non-Shorthands
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// (1) Put empty string in override style for property mPropID
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// (saving old override style value, so we can set it again when we're done)
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nsCOMPtr<nsIDOMCSSStyleDeclaration> overrideStyle;
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mElement->GetSMILOverrideStyle(getter_AddRefs(overrideStyle));
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nsCOMPtr<nsICSSDeclaration> overrideDecl = do_QueryInterface(overrideStyle);
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nsAutoString cachedOverrideStyleVal;
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if (overrideDecl) {
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overrideDecl->GetPropertyValue(mPropID, cachedOverrideStyleVal);
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// (Don't bother clearing override style if it's already empty)
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if (!cachedOverrideStyleVal.IsEmpty()) {
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overrideDecl->SetPropertyValue(mPropID, EmptyString());
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}
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}
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// (2) Get Computed Style
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nsAutoString computedStyleVal;
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PRBool didGetComputedVal = GetCSSComputedValue(mElement, mPropID,
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computedStyleVal);
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// (3) Put cached override style back (if it's non-empty)
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if (overrideDecl && !cachedOverrideStyleVal.IsEmpty()) {
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overrideDecl->SetPropertyValue(mPropID, cachedOverrideStyleVal);
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}
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// (4) Populate our nsSMILValue from the computed style
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if (didGetComputedVal) {
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nsSMILCSSValueType::ValueFromString(mPropID, mElement, computedStyleVal,
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PR_FALSE, baseValue);
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}
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return baseValue;
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}
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nsresult
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nsSMILCSSProperty::ValueFromString(const nsAString& aStr,
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const nsISMILAnimationElement* aSrcElement,
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nsSMILValue& aValue,
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PRBool& aCanCache) const
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{
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NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
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nsSMILCSSValueType::ValueFromString(mPropID, mElement, aStr,
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PR_FALSE, aValue);
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if (aValue.IsNull()) {
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return NS_ERROR_FAILURE;
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}
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// XXXdholbert: For simplicity, just assume that all CSS values have to
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// reparsed every sample. This prevents us from doing the "nothing's changed
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// so don't recompose" optimization (bug 533291) for CSS properties & mapped
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// attributes. If it ends up being expensive to always recompose those, we
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// can be a little smarter here. We really only need to disable aCanCache
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// for "inherit" & "currentColor" (whose values could change at any time), as
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// well as for length-valued types (particularly those with em/ex/percent
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// units, since their conversion ratios can change at any time).
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aCanCache = PR_FALSE;
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return NS_OK;
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}
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nsresult
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nsSMILCSSProperty::SetAnimValue(const nsSMILValue& aValue)
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{
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NS_ENSURE_TRUE(IsPropertyAnimatable(mPropID), NS_ERROR_FAILURE);
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// Convert nsSMILValue to string
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nsAutoString valStr;
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if (!nsSMILCSSValueType::ValueToString(aValue, valStr)) {
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NS_WARNING("Failed to convert nsSMILValue for CSS property into a string");
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return NS_ERROR_FAILURE;
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}
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// Use string value to style the target element
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nsCOMPtr<nsIDOMCSSStyleDeclaration> overrideStyle;
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mElement->GetSMILOverrideStyle(getter_AddRefs(overrideStyle));
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NS_ABORT_IF_FALSE(overrideStyle, "Need a non-null overrideStyle");
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nsCOMPtr<nsICSSDeclaration> overrideDecl = do_QueryInterface(overrideStyle);
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if (overrideDecl) {
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overrideDecl->SetPropertyValue(mPropID, valStr);
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}
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return NS_OK;
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}
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void
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nsSMILCSSProperty::ClearAnimValue()
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{
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// Put empty string in override style for our property
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nsCOMPtr<nsIDOMCSSStyleDeclaration> overrideStyle;
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mElement->GetSMILOverrideStyle(getter_AddRefs(overrideStyle));
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nsCOMPtr<nsICSSDeclaration> overrideDecl = do_QueryInterface(overrideStyle);
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if (overrideDecl) {
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overrideDecl->SetPropertyValue(mPropID, EmptyString());
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}
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}
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// Based on http://www.w3.org/TR/SVG/propidx.html
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// static
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PRBool
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nsSMILCSSProperty::IsPropertyAnimatable(nsCSSProperty aPropID)
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{
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// NOTE: Right now, Gecko doesn't recognize the following properties from
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// the SVG Property Index:
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// alignment-baseline
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// baseline-shift
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// color-profile
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// color-rendering
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// glyph-orientation-horizontal
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// glyph-orientation-vertical
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// kerning
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// writing-mode
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switch (aPropID) {
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case eCSSProperty_clip:
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case eCSSProperty_clip_rule:
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case eCSSProperty_clip_path:
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case eCSSProperty_color:
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case eCSSProperty_color_interpolation:
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case eCSSProperty_color_interpolation_filters:
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case eCSSProperty_cursor:
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case eCSSProperty_display:
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case eCSSProperty_dominant_baseline:
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case eCSSProperty_fill:
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case eCSSProperty_fill_opacity:
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case eCSSProperty_fill_rule:
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case eCSSProperty_filter:
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case eCSSProperty_flood_color:
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case eCSSProperty_flood_opacity:
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case eCSSProperty_font:
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case eCSSProperty_font_family:
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case eCSSProperty_font_size:
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case eCSSProperty_font_size_adjust:
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case eCSSProperty_font_stretch:
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case eCSSProperty_font_style:
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case eCSSProperty_font_variant:
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case eCSSProperty_font_weight:
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case eCSSProperty_image_rendering:
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case eCSSProperty_letter_spacing:
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case eCSSProperty_lighting_color:
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case eCSSProperty_marker:
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case eCSSProperty_marker_end:
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case eCSSProperty_marker_mid:
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case eCSSProperty_marker_start:
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case eCSSProperty_mask:
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case eCSSProperty_opacity:
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case eCSSProperty_overflow:
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case eCSSProperty_pointer_events:
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case eCSSProperty_shape_rendering:
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case eCSSProperty_stop_color:
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case eCSSProperty_stop_opacity:
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case eCSSProperty_stroke:
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case eCSSProperty_stroke_dasharray:
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case eCSSProperty_stroke_dashoffset:
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case eCSSProperty_stroke_linecap:
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case eCSSProperty_stroke_linejoin:
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case eCSSProperty_stroke_miterlimit:
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case eCSSProperty_stroke_opacity:
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case eCSSProperty_stroke_width:
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case eCSSProperty_text_anchor:
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case eCSSProperty_text_decoration:
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case eCSSProperty_text_rendering:
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case eCSSProperty_visibility:
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case eCSSProperty_word_spacing:
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return PR_TRUE;
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// EXPLICITLY NON-ANIMATABLE PROPERTIES:
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// (Some of these aren't supported at all in Gecko -- I've commented those
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// ones out. If/when we add support for them, uncomment their line here)
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// ----------------------------------------------------------------------
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// case eCSSProperty_enable_background:
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// case eCSSProperty_glyph_orientation_horizontal:
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// case eCSSProperty_glyph_orientation_vertical:
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// case eCSSProperty_writing_mode:
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case eCSSProperty_direction:
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case eCSSProperty_unicode_bidi:
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return PR_FALSE;
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default:
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return PR_FALSE;
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}
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}
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