WebKit之binding案例分析（testMediaQueryListListener.idl）

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本文深入探讨了在JavaScript环境中实现媒体查询监听器的细节，并展示了如何将其应用于实际项目中，以响应不同设备和屏幕尺寸的变化。

## testMediaQueryListListener.idl

module test {
    interface TestMediaQueryListListener {
        void method(in MediaQueryListListener listener);
    };
}

## JSTestMediaQueryListListener.h

#ifndef JSTestMediaQueryListListener_h
#define JSTestMediaQueryListListener_h

#include "JSDOMBinding.h"
#include <runtime/JSGlobalObject.h>
#include <runtime/JSObjectWithGlobalObject.h>
#include <runtime/ObjectPrototype.h>

namespace WebCore {

class TestMediaQueryListListener;

class JSTestMediaQueryListListener : public DOMObjectWithGlobalPointer {
    typedef DOMObjectWithGlobalPointer Base;
public:
    JSTestMediaQueryListListener(NonNullPassRefPtr<JSC::Structure>, JSDOMGlobalObject*, PassRefPtr<TestMediaQueryListListener>);
    static JSC::JSObject* createPrototype(JSC::ExecState*, JSC::JSGlobalObject*);
    virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&);
    virtual bool getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertyDescriptor&);
    static const JSC::ClassInfo s_info;

    static PassRefPtr<JSC::Structure> createStructure(JSC::JSGlobalData& globalData, JSC::JSValue prototype)
    {
        return JSC::Structure::create(globalData, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
    }

    static JSC::JSValue getConstructor(JSC::ExecState*, JSC::JSGlobalObject*);
    TestMediaQueryListListener* impl() const { return m_impl.get(); }

private:
    RefPtr<TestMediaQueryListListener> m_impl;
protected:
    static const unsigned StructureFlags = JSC::OverridesGetOwnPropertySlot | Base::StructureFlags;
};

JSC::JSValue toJS(JSC::ExecState*, JSDOMGlobalObject*, TestMediaQueryListListener*);
TestMediaQueryListListener* toTestMediaQueryListListener(JSC::JSValue);

class JSTestMediaQueryListListenerPrototype : public JSC::JSObjectWithGlobalObject {
    typedef JSC::JSObjectWithGlobalObject Base;
public:
    static JSC::JSObject* self(JSC::ExecState*, JSC::JSGlobalObject*);
    static const JSC::ClassInfo s_info;
    virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier&, JSC::PropertySlot&);
    virtual bool getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier&, JSC::PropertyDescriptor&);
    static PassRefPtr<JSC::Structure> createStructure(JSC::JSGlobalData& globalData, JSC::JSValue prototype)
    {
        return JSC::Structure::create(globalData, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
    }
    JSTestMediaQueryListListenerPrototype(JSC::JSGlobalObject* globalObject, NonNullPassRefPtr<JSC::Structure> structure) : JSC::JSObjectWithGlobalObject(globalObject, structure) { }
protected:
    static const unsigned StructureFlags = JSC::OverridesGetOwnPropertySlot | Base::StructureFlags;
};

// Functions

JSC::EncodedJSValue JSC_HOST_CALL jsTestMediaQueryListListenerPrototypeFunctionMethod(JSC::ExecState*);
// Attributes

JSC::JSValue jsTestMediaQueryListListenerConstructor(JSC::ExecState*, JSC::JSValue, const JSC::Identifier&);

} // namespace WebCore

#endif

## JSTestMediaQueryListListener.cpp

#include "config.h"
#include "JSTestMediaQueryListListener.h"

#include "ExceptionCode.h"
#include "JSDOMBinding.h"
#include "MediaQueryListListener.h"
#include "TestMediaQueryListListener.h"
#include <runtime/Error.h>
#include <wtf/GetPtr.h>

using namespace JSC;

namespace WebCore {

ASSERT_CLASS_FITS_IN_CELL(JSTestMediaQueryListListener);

/* Hash table */
#if ENABLE(JIT)
#define THUNK_GENERATOR(generator) , generator
#else
#define THUNK_GENERATOR(generator)
#endif

static const HashTableValue JSTestMediaQueryListListenerTableValues[2] =
{
    { "constructor", DontEnum | ReadOnly, (intptr_t)static_cast<PropertySlot::GetValueFunc>(jsTestMediaQueryListListenerConstructor), (intptr_t)0 THUNK_GENERATOR(0) },
    { 0, 0, 0, 0 THUNK_GENERATOR(0) }
};

#undef THUNK_GENERATOR
static JSC_CONST_HASHTABLE HashTable JSTestMediaQueryListListenerTable = { 2, 1, JSTestMediaQueryListListenerTableValues, 0 };
/* Hash table for constructor */
#if ENABLE(JIT)
#define THUNK_GENERATOR(generator) , generator
#else
#define THUNK_GENERATOR(generator)
#endif

static const HashTableValue JSTestMediaQueryListListenerConstructorTableValues[1] =
{
    { 0, 0, 0, 0 THUNK_GENERATOR(0) }
};

#undef THUNK_GENERATOR
static JSC_CONST_HASHTABLE HashTable JSTestMediaQueryListListenerConstructorTable = { 1, 0, JSTestMediaQueryListListenerConstructorTableValues, 0 };
class JSTestMediaQueryListListenerConstructor : public DOMConstructorObject {
public:
    JSTestMediaQueryListListenerConstructor(JSC::ExecState*, JSDOMGlobalObject*);

    virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier&, JSC::PropertySlot&);
    virtual bool getOwnPropertyDescriptor(JSC::ExecState*, const JSC::Identifier&, JSC::PropertyDescriptor&);
    static const JSC::ClassInfo s_info;
    static PassRefPtr<JSC::Structure> createStructure(JSC::JSGlobalData& globalData, JSC::JSValue prototype)
    {
        return JSC::Structure::create(globalData, prototype, JSC::TypeInfo(JSC::ObjectType, StructureFlags), AnonymousSlotCount, &s_info);
    }
protected:
    static const unsigned StructureFlags = JSC::OverridesGetOwnPropertySlot | JSC::ImplementsHasInstance | DOMConstructorObject::StructureFlags;
};

const ClassInfo JSTestMediaQueryListListenerConstructor::s_info = { "TestMediaQueryListListenerConstructor", &DOMConstructorObject::s_info, &JSTestMediaQueryListListenerConstructorTable, 0 };

JSTestMediaQueryListListenerConstructor::JSTestMediaQueryListListenerConstructor(ExecState* exec, JSDOMGlobalObject* globalObject)
    : DOMConstructorObject(JSTestMediaQueryListListenerConstructor::createStructure(globalObject->globalData(), globalObject->objectPrototype()), globalObject)
{
    ASSERT(inherits(&s_info));
    putDirect(exec->globalData(), exec->propertyNames().prototype, JSTestMediaQueryListListenerPrototype::self(exec, globalObject), DontDelete | ReadOnly);
}

bool JSTestMediaQueryListListenerConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    return getStaticValueSlot<JSTestMediaQueryListListenerConstructor, DOMObject>(exec, &JSTestMediaQueryListListenerConstructorTable, this, propertyName, slot);
}

bool JSTestMediaQueryListListenerConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
{
    return getStaticValueDescriptor<JSTestMediaQueryListListenerConstructor, DOMObject>(exec, &JSTestMediaQueryListListenerConstructorTable, this, propertyName, descriptor);
}

/* Hash table for prototype */
#if ENABLE(JIT)
#define THUNK_GENERATOR(generator) , generator
#else
#define THUNK_GENERATOR(generator)
#endif

static const HashTableValue JSTestMediaQueryListListenerPrototypeTableValues[2] =
{
    { "method", DontDelete | Function, (intptr_t)static_cast<NativeFunction>(jsTestMediaQueryListListenerPrototypeFunctionMethod), (intptr_t)1 THUNK_GENERATOR(0) },
    { 0, 0, 0, 0 THUNK_GENERATOR(0) }
};

#undef THUNK_GENERATOR
static JSC_CONST_HASHTABLE HashTable JSTestMediaQueryListListenerPrototypeTable = { 2, 1, JSTestMediaQueryListListenerPrototypeTableValues, 0 };
const ClassInfo JSTestMediaQueryListListenerPrototype::s_info = { "TestMediaQueryListListenerPrototype", &JSC::JSObjectWithGlobalObject::s_info, &JSTestMediaQueryListListenerPrototypeTable, 0 };

JSObject* JSTestMediaQueryListListenerPrototype::self(ExecState* exec, JSGlobalObject* globalObject)
{
    return getDOMPrototype<JSTestMediaQueryListListener>(exec, globalObject);
}

bool JSTestMediaQueryListListenerPrototype::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    return getStaticFunctionSlot<JSObject>(exec, &JSTestMediaQueryListListenerPrototypeTable, this, propertyName, slot);
}

bool JSTestMediaQueryListListenerPrototype::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
{
    return getStaticFunctionDescriptor<JSObject>(exec, &JSTestMediaQueryListListenerPrototypeTable, this, propertyName, descriptor);
}

const ClassInfo JSTestMediaQueryListListener::s_info = { "TestMediaQueryListListener", &DOMObjectWithGlobalPointer::s_info, &JSTestMediaQueryListListenerTable, 0 };

JSTestMediaQueryListListener::JSTestMediaQueryListListener(NonNullPassRefPtr<Structure> structure, JSDOMGlobalObject* globalObject, PassRefPtr<TestMediaQueryListListener> impl)
    : DOMObjectWithGlobalPointer(structure, globalObject)
    , m_impl(impl)
{
    ASSERT(inherits(&s_info));
}

JSObject* JSTestMediaQueryListListener::createPrototype(ExecState* exec, JSGlobalObject* globalObject)
{
    return new (exec) JSTestMediaQueryListListenerPrototype(globalObject, JSTestMediaQueryListListenerPrototype::createStructure(globalObject->globalData(), globalObject->objectPrototype()));
}

bool JSTestMediaQueryListListener::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    return getStaticValueSlot<JSTestMediaQueryListListener, Base>(exec, &JSTestMediaQueryListListenerTable, this, propertyName, slot);
}

bool JSTestMediaQueryListListener::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
{
    return getStaticValueDescriptor<JSTestMediaQueryListListener, Base>(exec, &JSTestMediaQueryListListenerTable, this, propertyName, descriptor);
}

JSValue jsTestMediaQueryListListenerConstructor(ExecState* exec, JSValue slotBase, const Identifier&)
{
    JSTestMediaQueryListListener* domObject = static_cast<JSTestMediaQueryListListener*>(asObject(slotBase));
    return JSTestMediaQueryListListener::getConstructor(exec, domObject->globalObject());
}

JSValue JSTestMediaQueryListListener::getConstructor(ExecState* exec, JSGlobalObject* globalObject)
{
    return getDOMConstructor<JSTestMediaQueryListListenerConstructor>(exec, static_cast<JSDOMGlobalObject*>(globalObject));
}

EncodedJSValue JSC_HOST_CALL jsTestMediaQueryListListenerPrototypeFunctionMethod(ExecState* exec)
{
    JSValue thisValue = exec->hostThisValue();
    if (!thisValue.inherits(&JSTestMediaQueryListListener::s_info))
        return throwVMTypeError(exec);
    JSTestMediaQueryListListener* castedThis = static_cast<JSTestMediaQueryListListener*>(asObject(thisValue));
    TestMediaQueryListListener* imp = static_cast<TestMediaQueryListListener*>(castedThis->impl());
    RefPtr<MediaQueryListListener> listener(MediaQueryListListener::create(ScriptValue(exec->globalData(), exec->argument(0))));
    if (exec->hadException())
        return JSValue::encode(jsUndefined());

    imp->method(listener);
    return JSValue::encode(jsUndefined());
}

JSC::JSValue toJS(JSC::ExecState* exec, JSDOMGlobalObject* globalObject, TestMediaQueryListListener* object)
{
    return getDOMObjectWrapper<JSTestMediaQueryListListener>(exec, globalObject, object);
}
TestMediaQueryListListener* toTestMediaQueryListListener(JSC::JSValue value)
{
    return value.inherits(&JSTestMediaQueryListListener::s_info) ? static_cast<JSTestMediaQueryListListener*>(asObject(value))->impl() : 0;
}

}