flutter::DirectManipulationEventHandler Class Reference

#include <direct_manipulation.h>

Inheritance diagram for flutter::DirectManipulationEventHandler:

Public Member Functions
	DirectManipulationEventHandler (DirectManipulationOwner *owner)
STDMETHODIMP	QueryInterface (REFIID iid, void **ppv) override
ULONG STDMETHODCALLTYPE	AddRef () override
ULONG STDMETHODCALLTYPE	Release () override
HRESULT STDMETHODCALLTYPE	OnViewportStatusChanged (IDirectManipulationViewport *viewport, DIRECTMANIPULATION_STATUS current, DIRECTMANIPULATION_STATUS previous) override
HRESULT STDMETHODCALLTYPE	OnViewportUpdated (IDirectManipulationViewport *viewport) override
HRESULT STDMETHODCALLTYPE	OnContentUpdated (IDirectManipulationViewport *viewport, IDirectManipulationContent *content) override
HRESULT STDMETHODCALLTYPE	OnInteraction (IDirectManipulationViewport2 *viewport, DIRECTMANIPULATION_INTERACTION_TYPE interaction) override

Friends
class	DirectManipulationOwner

Detailed Description

Definition at line 67 of file direct_manipulation.h.

Constructor & Destructor Documentation

DirectManipulationEventHandler()

flutter::DirectManipulationEventHandler::DirectManipulationEventHandler ( DirectManipulationOwner *  owner )

inlineexplicit

Definition at line 76 of file direct_manipulation.h.

      : owner_(owner) {}

Member Function Documentation

AddRef()

ULONG STDMETHODCALLTYPE flutter::DirectManipulationEventHandler::AddRef ( )

override

Definition at line 165 of file direct_manipulation.cc.

                                                               {
  RefCountedThreadSafe::AddRef();
  return 0;
}

Referenced by QueryInterface().

OnContentUpdated()

HRESULT flutter::DirectManipulationEventHandler::OnContentUpdated ( IDirectManipulationViewport *  viewport, IDirectManipulationContent *  content  )

override

Definition at line 133 of file direct_manipulation.cc.

                                         {
  float transform[6];
  HRESULT hr = content->GetContentTransform(transform, ARRAYSIZE(transform));
  if (FAILED(hr)) {
    FML_LOG(ERROR) << "GetContentTransform failed";
    return S_OK;
  }
  if (!during_synthesized_reset_) {
    GestureData data = ConvertToGestureData(transform);
    float scale = data.scale / initial_gesture_data_.scale;
    float pan_x = data.pan_x - initial_gesture_data_.pan_x;
    float pan_y = data.pan_y - initial_gesture_data_.pan_y;
    last_pan_delta_x_ = pan_x - last_pan_x_;
    last_pan_delta_y_ = pan_y - last_pan_y_;
    last_pan_x_ = pan_x;
    last_pan_y_ = pan_y;
    if (owner_->binding_handler_delegate && !during_inertia_) {
      owner_->binding_handler_delegate->OnPointerPanZoomUpdate(
          GetDeviceId(), pan_x, pan_y, scale, 0);
    }
  }
  return S_OK;
}

References flutter::DirectManipulationOwner::binding_handler_delegate, content, and flutter::WindowBindingHandlerDelegate::OnPointerPanZoomUpdate().

OnInteraction()

HRESULT flutter::DirectManipulationEventHandler::OnInteraction ( IDirectManipulationViewport2 *  viewport, DIRECTMANIPULATION_INTERACTION_TYPE  interaction  )

override

Definition at line 159 of file direct_manipulation.cc.

                                                     {
  return S_OK;
}

OnViewportStatusChanged()

HRESULT flutter::DirectManipulationEventHandler::OnViewportStatusChanged ( IDirectManipulationViewport *  viewport, DIRECTMANIPULATION_STATUS  current, DIRECTMANIPULATION_STATUS  previous  )

override

Definition at line 64 of file direct_manipulation.cc.

                                        {
  if (during_synthesized_reset_) {
    during_synthesized_reset_ = current != DIRECTMANIPULATION_READY;
    return S_OK;
  }
  during_inertia_ = current == DIRECTMANIPULATION_INERTIA;
  if (current == DIRECTMANIPULATION_RUNNING) {
    IDirectManipulationContent* content;
    HRESULT hr = viewport->GetPrimaryContent(IID_PPV_ARGS(&content));
    if (SUCCEEDED(hr)) {
      float transform[6];
      hr = content->GetContentTransform(transform, ARRAYSIZE(transform));
      if (SUCCEEDED(hr)) {
        initial_gesture_data_ = ConvertToGestureData(transform);
      } else {
        FML_LOG(ERROR) << "GetContentTransform failed";
      }
    } else {
      FML_LOG(ERROR) << "GetPrimaryContent failed";
    }
    if (owner_->binding_handler_delegate) {
      owner_->binding_handler_delegate->OnPointerPanZoomStart(GetDeviceId());
    }
  } else if (previous == DIRECTMANIPULATION_RUNNING) {
    // Reset deltas to ensure only inertia values will be compared later.
    last_pan_delta_x_ = 0.0;
    last_pan_delta_y_ = 0.0;
    if (owner_->binding_handler_delegate) {
      owner_->binding_handler_delegate->OnPointerPanZoomEnd(GetDeviceId());
    }
  } else if (previous == DIRECTMANIPULATION_INERTIA) {
    if (owner_->binding_handler_delegate &&
        (std::max)(std::abs(last_pan_delta_x_), std::abs(last_pan_delta_y_)) >
            0.01) {
      owner_->binding_handler_delegate->OnScrollInertiaCancel(GetDeviceId());
    }
    // Need to reset the content transform to its original position
    // so that we are ready for the next gesture.
    // Use during_synthesized_reset_ flag to prevent sending reset also to the
    // framework.
    during_synthesized_reset_ = true;
    last_pan_x_ = 0.0;
    last_pan_y_ = 0.0;
    last_pan_delta_x_ = 0.0;
    last_pan_delta_y_ = 0.0;
    RECT rect;
    HRESULT hr = viewport->GetViewportRect(&rect);
    if (FAILED(hr)) {
      FML_LOG(ERROR) << "Failed to get the current viewport rect";
      return E_FAIL;
    }
    hr = viewport->ZoomToRect(rect.left, rect.top, rect.right, rect.bottom,
                              false);
    if (FAILED(hr)) {
      FML_LOG(ERROR) << "Failed to reset the gesture using ZoomToRect";
      return E_FAIL;
    }
  }
  return S_OK;
}

References flutter::DirectManipulationOwner::binding_handler_delegate, content, flutter::WindowBindingHandlerDelegate::OnPointerPanZoomEnd(), flutter::WindowBindingHandlerDelegate::OnPointerPanZoomStart(), and flutter::WindowBindingHandlerDelegate::OnScrollInertiaCancel().

OnViewportUpdated()

HRESULT flutter::DirectManipulationEventHandler::OnViewportUpdated ( IDirectManipulationViewport *  viewport )

override

Definition at line 128 of file direct_manipulation.cc.

                                           {
  return S_OK;
}

QueryInterface()

STDMETHODIMP flutter::DirectManipulationEventHandler::QueryInterface ( REFIID  iid, void **  ppv  )

override

Definition at line 33 of file direct_manipulation.cc.

                                                                        {
  if ((iid == IID_IUnknown) ||
      (iid == IID_IDirectManipulationViewportEventHandler)) {
    *ppv = static_cast<IDirectManipulationViewportEventHandler*>(this);
    AddRef();
    return S_OK;
  } else if (iid == IID_IDirectManipulationInteractionEventHandler) {
    *ppv = static_cast<IDirectManipulationInteractionEventHandler*>(this);
    AddRef();
    return S_OK;
  }
  return E_NOINTERFACE;
}

References AddRef().

Release()

ULONG STDMETHODCALLTYPE flutter::DirectManipulationEventHandler::Release ( )

override

Definition at line 170 of file direct_manipulation.cc.

                                                                {
  RefCountedThreadSafe::Release();
  return 0;
}

Friends And Related Function Documentation

DirectManipulationOwner

friend class DirectManipulationOwner

friend

Definition at line 71 of file direct_manipulation.h.

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The documentation for this class was generated from the following files:

• shell/platform/windows/direct_manipulation.h
• shell/platform/windows/direct_manipulation.cc