C++ Silverlight for Windows Embedded(SWE)中的数据绑定
有人可以给我举一个工作示例,说明我应该如何在Silverlight for Windows Embedded(SWE)中进行数据绑定。我已经看到了很多,所以这似乎是可能的。我已经读到我需要实现IXRPropertyBag以使其工作,但还没有找到(工作)如何操作的说明。我设法使数据绑定在两个C++ Silverlight for Windows Embedded(SWE)中的数据绑定,c++,data-binding,silverlight-3.0,windows-ce,C++,Data Binding,Silverlight 3.0,Windows Ce,有人可以给我举一个工作示例,说明我应该如何在Silverlight for Windows Embedded(SWE)中进行数据绑定。我已经看到了很多,所以这似乎是可能的。我已经读到我需要实现IXRPropertyBag以使其工作,但还没有找到(工作)如何操作的说明。我设法使数据绑定在两个ToggleButton元素的IsChecked属性之间工作,基于WCE7 CTP附带的帮助文件中发现的疯狂的坏例子。我本来希望在XAML中设置数据上下文和数据绑定,但文档告诉我要编写代码 首先,您必须创建一个
ToggleButton
元素的IsChecked
属性之间工作,基于WCE7 CTP附带的帮助文件中发现的疯狂的坏例子。我本来希望在XAML中设置数据上下文和数据绑定,但文档告诉我要编写代码
首先,您必须创建一个实现IXRPropertyBag
的类。然后,您必须从代码中将数据上下文和数据绑定设置为此属性包的实例
很抱歉代码中没有命名约定,但它仍然比Microsoft提供的示例要好得多。它也不像可能的那样通用,但我将把重构留给您
MyPropertyBag.h:
#pragma once
#include "windows.h"
#include "XamlRuntime.h"
#include "XRCustomEvent.h"
#include "XRPtr.h"
class __declspec(uuid("3C6FFC6F-17A8-4976-B034-B4FE3BFF530A"))
MyPropertyBag : public IXRPropertyBag
{
private:
LONG m_cRef;
IXRCustomEvent<XRPropertyChangedCustomEventArgs, IXRPropertyBag> *pRadioEvent;
XRThreeState RadioState;
public:
MyPropertyBag(void);
HRESULT STDMETHODCALLTYPE GetValue(__in const WCHAR* pstrPropertyName, __out XRValue *pValue);
HRESULT STDMETHODCALLTYPE SetValue(__in const WCHAR* pstrPropertyName, __in XRValue *pValue);
HRESULT STDMETHODCALLTYPE GetPropertyChangedEvent(__out IXRCustomEvent<XRPropertyChangedCustomEventArgs, IXRPropertyBag>** ppEvent);
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, LPVOID * ppvObj);
ULONG STDMETHODCALLTYPE AddRef();
ULONG STDMETHODCALLTYPE Release();
};
您还可以使用TBoundProperty—请参阅本Hands on labs,了解将椭圆宽度绑定到滑块的简单示例 MSDN虚拟实验室:Silverlight for Windows Embedded中的数据绑定
#include "StdAfx.h"
#include "MyPropertyBag.h"
extern "C" const GUID __declspec(selectany) IID_MyPropertyBag = __uuidof(IXRPropertyBag);
MyPropertyBag::MyPropertyBag(void)
{
RadioState = XRThreeState_Unchecked;
pRadioEvent = CreateCustomEvent<XRPropertyChangedCustomEventArgs, IXRPropertyBag>();
}
// IXRPropertyBag implementation:
HRESULT MyPropertyBag::GetValue(__in const WCHAR* pstrPropertyName, __out XRValue *pValue)
{
HRESULT hr = E_FAIL;
if (0 == wcscmp(pstrPropertyName, L"RadioState"))
{
pValue->vType = VTYPE_INT;
pValue->IntVal = (int)RadioState;
hr = S_OK;
}
return hr;
}
HRESULT MyPropertyBag::SetValue(__in const WCHAR* pstrPropertyName, __in XRValue *pValue)
{
HRESULT hr = E_FAIL;
if (0 == wcscmp(pstrPropertyName, L"RadioState"))
{
RadioState = (XRThreeState)pValue->IntVal;
XRPropertyChangedCustomEventArgs eventArgs;
eventArgs.PropertyName = pstrPropertyName;
pRadioEvent->Raise(this, &eventArgs);
hr = S_OK;
}
return hr;
}
HRESULT MyPropertyBag::GetPropertyChangedEvent(IXRCustomEvent<XRPropertyChangedCustomEventArgs, IXRPropertyBag>** ppEvent)
{
*ppEvent = pRadioEvent;
return S_OK;
}
// end of IXRPropertyBag implementation.
// IUnknown implementation:
HRESULT MyPropertyBag::QueryInterface(REFIID riid, LPVOID * ppvObj)
{
if (!ppvObj)
return E_INVALIDARG;
*ppvObj = NULL;
if (riid == IID_IUnknown || riid == IID_MyPropertyBag)
{
*ppvObj = (LPVOID)this;
AddRef();
return NOERROR;
}
return E_NOINTERFACE;
}
ULONG MyPropertyBag::AddRef()
{
InterlockedIncrement(&m_cRef);
return m_cRef;
}
ULONG MyPropertyBag::Release()
{
ULONG ulRefCount = InterlockedDecrement(&m_cRef);
if (0 == m_cRef)
{
delete this;
}
return ulRefCount;
}
// end of IUnknown implementation.
// Data bindings
XRPtr<MyPropertyBag> viewModel(new MyPropertyBag());
BindDataToControl(pTb1, viewModel);
BindDataToControl(pTb2, viewModel);
// save the exit code for WinMain
hr = m_pVisualHost->StartDialog(&uiExitCode);
SetWinMainResultCode(uiExitCode);
inline void App::BindDataToControl(IXRFrameworkElement* pElement, IXRPropertyBag* pPropertyBag)
{
// Set the binding value and source property
XRBinding binding;
binding.Mode = XRBindingMode_TwoWay;
binding.Path = L"RadioState";
pElement->SetBinding(L"IsChecked", &binding);
// Convert the data source object to an XRValue
XRValue dataContext;
dataContext.vType = VTYPE_PROPERTYBAG;
dataContext.pPropertyBagVal = pPropertyBag;
// Set the data source object as the data context for the option button
pElement->SetDataContext(&dataContext);
}