9f01c8168b
Description of the changes: Adjusted some of the values in .clang-format Add clang-format-all.ps1 Fix path to .clang-format in Calculator.sln How changes were validated: Manual.
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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#pragma once
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namespace CalculatorApp
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{
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namespace Common
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{
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template <typename TTarget>
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ref class DelegateCommand : public Windows::UI::Xaml::Input::ICommand
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{
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internal :
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typedef void (TTarget::*CommandHandlerFunc)(Platform::Object ^);
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DelegateCommand(TTarget ^ target, CommandHandlerFunc func)
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: m_weakTarget(target)
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, m_function(func)
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{
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}
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private:
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// Explicit, and private, implementation of ICommand, this way of programming makes it so
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// the ICommand methods will only be available if the ICommand interface is requested via a dynamic_cast
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// The ICommand interface is meant to be consumed by Xaml and not by the app, this is a defensive measure against
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// code in the app calling Execute.
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virtual void ExecuteImpl(Platform::Object ^ parameter) sealed = Windows::UI::Xaml::Input::ICommand::Execute
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{
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TTarget ^ target = m_weakTarget.Resolve<TTarget>();
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if (target)
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{
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(target->*m_function)(parameter);
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}
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}
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virtual bool CanExecuteImpl(Platform::Object ^ parameter) sealed = Windows::UI::Xaml::Input::ICommand::CanExecute
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{
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return true;
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}
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virtual event Windows::Foundation::EventHandler<Platform::Object^>^ CanExecuteChangedImpl
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{
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virtual Windows::Foundation::EventRegistrationToken add(Windows::Foundation::EventHandler<Platform::Object^>^ handler) sealed = Windows::UI::Xaml::Input::ICommand::CanExecuteChanged::add
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{
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return m_canExecuteChanged += handler;
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}
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virtual void remove(Windows::Foundation::EventRegistrationToken token) sealed = Windows::UI::Xaml::Input::ICommand::CanExecuteChanged::remove
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{
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m_canExecuteChanged -= token;
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}
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}
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private:
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event Windows::Foundation::EventHandler<Platform::Object^>^ m_canExecuteChanged;
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CommandHandlerFunc m_function;
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Platform::WeakReference m_weakTarget;
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};
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template <typename TTarget, typename TFuncPtr>
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DelegateCommand<TTarget> ^ MakeDelegate(TTarget ^ target, TFuncPtr&& function) {
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return ref new DelegateCommand<TTarget>(target, std::forward<TFuncPtr>(function));
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}
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}
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}
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