flutter::DisplayMonitor Class Reference

#include <display_monitor.h>

Public Member Functions
	DisplayMonitor (FlutterWindowsEngine *engine)
	~DisplayMonitor ()
void	UpdateDisplays ()
bool	HandleWindowMessage (HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam, LRESULT *result)
std::optional< FlutterEngineDisplay >	FindById (FlutterEngineDisplayId id)
std::vector< FlutterEngineDisplay >	GetDisplays () const

Detailed Description

Definition at line 18 of file display_monitor.h.

Constructor & Destructor Documentation

DisplayMonitor()

flutter::DisplayMonitor::DisplayMonitor ( FlutterWindowsEngine *  engine )

explicit

Definition at line 24 of file display_monitor.cc.

    : engine_(engine), win32_(engine->windows_proc_table()) {}

~DisplayMonitor()

flutter::DisplayMonitor::~DisplayMonitor

(

)

Definition at line 27 of file display_monitor.cc.

{}

Member Function Documentation

FindById()

std::optional< FlutterEngineDisplay > flutter::DisplayMonitor::FindById

(

FlutterEngineDisplayId

id

)

Definition at line 96 of file display_monitor.cc.

                               {
  for (auto const& display : GetDisplays()) {
    if (display.display_id == id) {
      return display;
    }
  }
 
  return std::nullopt;
}

References GetDisplays().

GetDisplays()

std::vector< FlutterEngineDisplay > flutter::DisplayMonitor::GetDisplays

(

)

const

Definition at line 107 of file display_monitor.cc.

                                                                  {
  std::vector<FlutterEngineDisplay> displays;
  MonitorEnumState state = {this, &displays};
  win32_->EnumDisplayMonitors(nullptr, nullptr, EnumMonitorCallback,
                              reinterpret_cast<LPARAM>(&state));
 
  if (displays.size() == 1) {
    displays[0].single_display = true;
  }
 
  return displays;
}

References displays.

Referenced by FindById(), and UpdateDisplays().

HandleWindowMessage()

bool flutter::DisplayMonitor::HandleWindowMessage	(	HWND	hwnd,
		UINT	message,
		WPARAM	wparam,
		LPARAM	lparam,
		LRESULT *	result
	)

Definition at line 82 of file display_monitor.cc.

                                                          {
  switch (message) {
    case WM_DISPLAYCHANGE:
    case WM_DPICHANGED:
      UpdateDisplays();
      break;
  }
  return false;
}

References message, and UpdateDisplays().

UpdateDisplays()

void flutter::DisplayMonitor::UpdateDisplays

(

)

Definition at line 77 of file display_monitor.cc.

                                    {
  auto displays = GetDisplays();
  engine_->UpdateDisplay(displays);
}

References displays, GetDisplays(), and flutter::FlutterWindowsEngine::UpdateDisplay().

Referenced by HandleWindowMessage().

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

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