UWP C++ 鼠标按钮向上事件无法始终如一地工作

Posted 2023-02-19

【中文标题】UWP C++ 鼠标按钮向上事件无法始终如一地工作

【英文标题】：UWP C++ Mouse Button Up Events Not Working Consistently

【发布时间】：2021-06-27 19:33:41

【问题描述】：

OnPointerPressed 工作正常，但 OnPointerReleased 不行。

window->KeyDown +=
    ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &EngineMain::OnKeyPressed);

window->KeyUp +=
    ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &EngineMain::OnKeyReleased);

window->PointerPressed +=
    ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &EngineMain::OnPointerPressed);

window->PointerReleased +=
    ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &EngineMain::OnPointerReleased);

window->PointerMoved +=
    ref new TypedEventHandler<CoreWindow^, PointerEventArgs^>(this, &EngineMain::OnPointerMoved);

void EngineMain::OnPointerPressed(CoreWindow^ sender, PointerEventArgs^ args)

    if (args->CurrentPoint->Properties->IsLeftButtonPressed)
    
        m_soundManager->GetSound(L"./Assets/rifle.wav")->StartSound();

        args->Handled = true;
    

    if (args->CurrentPoint->Properties->IsRightButtonPressed)
    
        m_soundManager->GetSound(L"./Assets/shotgun.wav")->StartSound();

        args->Handled = true;
    


void EngineMain::OnPointerReleased(CoreWindow^ sender, PointerEventArgs^ args)

    Windows::UI::Core::CoreVirtualKeyStates lmb = sender->GetKeyState(Windows::System::VirtualKey::LeftButton);
    Windows::UI::Core::CoreVirtualKeyStates mmb = sender->GetKeyState(Windows::System::VirtualKey::MiddleButton);
    Windows::UI::Core::CoreVirtualKeyStates rmb = sender->GetKeyState(Windows::System::VirtualKey::RightButton);

    if (lmb == Windows::UI::Core::CoreVirtualKeyStates::Down)
    
        m_soundManager->GetSound(L"./Assets/rifle.wav")->StartSound();

        args->Handled = true;
    

    if (rmb == Windows::UI::Core::CoreVirtualKeyStates::Down)
    
        m_soundManager->GetSound(L"./Assets/shotgun.wav")->StartSound();

        args->Handled = true;
    

我确实注意到点击的模式。如下：

鼠标按下有声音，鼠标松开有声音，鼠标按下有声音，鼠标松开没有声音

然后它重复 OR

鼠标按下发出声音，鼠标松开没有声音，鼠标按下发出声音，鼠标松开发出声音

这些天的鼠标事件似乎非常复杂。任何帮助将不胜感激，甚至可能是如何为鼠标按钮设置正确 OnPointerReleased 事件的编码示例。键盘事件是正确的。已发布事件的 MSDN 完全失败，因为它没有告诉您如何检查已发布的按钮。

【参考方案1】：

你可以尝试将代码m_soundManager->GetSound(L"./Assets/rifle.wav")->StartSound();放在OnPointerReleased方法的前面，可以查看鼠标松开时播放的声音，即每次调用OnPointerReleased方法鼠标释放。我了解到您想确定在 OnPointerReleased 方法上释放了哪个鼠标按钮。您可以尝试两种方法。

一种方法是改变if语句的条件，例如：

void UpEvent::MainPage::OnPointerReleased(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args)

    args->Handled = true;

    Windows::UI::Core::CoreVirtualKeyStates lmb = sender->GetKeyState(Windows::System::VirtualKey::LeftButton);
    Windows::UI::Core::CoreVirtualKeyStates mmb = sender->GetKeyState(Windows::System::VirtualKey::MiddleButton);
    Windows::UI::Core::CoreVirtualKeyStates rmb = sender->GetKeyState(Windows::System::VirtualKey::RightButton);

    if (lmb != Windows::UI::Core::CoreVirtualKeyStates::None)
    
        m_soundManager->GetSound(L"./Assets/rifle.wav")->StartSound();
    

    if (rmb != Windows::UI::Core::CoreVirtualKeyStates::None)
    
        m_soundManager->GetSound(L"./Assets/shotgun.wav")->StartSound();

    

另一种方法是在 OnPointerPressed 方法中而不是在 OnPointerReleased 方法中获取鼠标按钮信息。

int mouseButton=-1;

void UpEvent::MainPage::OnPointerPressed(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args)

    if (args->CurrentPoint->Properties->IsLeftButtonPressed)
    
        ……
        mouseButton = 0;
    
    if (args->CurrentPoint->Properties->IsRightButtonPressed)
    
        ……
        mouseButton = 1;
    



void UpEvent::MainPage::OnPointerReleased(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::PointerEventArgs^ args)

    args->Handled = true;

    if (mouseButton == 0)
    
        //Left mouse button is released
         m_soundManager->GetSound(L"./Assets/rifle.wav")->StartSound();
    
    if (mouseButton == 1)
    
        //Right mouse button is released
         m_soundManager->GetSound(L"./Assets/shotgun.wav")->StartSound();
    

【参考方案2】：

我解决了自己的问题，并认为离开该职位是个好主意。您实际上需要使用布尔值并在 OnPointerReleased 期间重置它们，因为发送者和参数不准确。用布尔值来做：

void EngineMain::OnPointerPressed(CoreWindow^ sender, PointerEventArgs^ args)

    if (args->CurrentPoint->Properties->IsLeftButtonPressed)
    
        m_mouseDevice->m_keyMap[DI::CMouseDevice::LMB]->m_isDown = true;
    

    if (args->CurrentPoint->Properties->IsMiddleButtonPressed)
    
        m_mouseDevice->m_keyMap[DI::CMouseDevice::MMB]->m_isDown = true;
    

    if (args->CurrentPoint->Properties->IsRightButtonPressed)
    
        m_mouseDevice->m_keyMap[DI::CMouseDevice::RMB]->m_isDown = true;
    


void EngineMain::OnPointerReleased(CoreWindow^ sender, PointerEventArgs^ args)

    m_mouseDevice->ResetButtons();

m_mouseDevice->ResetButtons();将所有布尔值重置为 false。虽然这只是一次一个按钮的策略，但由于不准确，它似乎是唯一的方法。最后一点，OnPointerPressed 仅在按下按钮时发生一次，因此如果您需要处理被按住的按钮，请这样做。