Detailed Description

This class implements the GUI thread required for the wxWidgets-based GUI.

This system is employed internally by gui::CDisplayWindow and gui::CDisplayWindow3D, and must be not used in any way directly by the MRPT user.

The system works by creating a invisible wxFrame that process timer events where it checks a queue of requests sent from the main MRPT thread. The requests include the creation, deletion,... of windows (2D/3D). In that way, just one thread is required for all the GUI windows, and the wxWidgets is initialized and clean-up correctly.

This header should be included just from the implementation files of CDisplayWindow and CDisplayWindow3D, since it uses wxWidgets classes.

See also: gui::CDisplayWindow, gui::CDisplayWindow3D

Definition at line 100 of file WxSubsystem.h.

#include <mrpt/gui/WxSubsystem.h>

Classes
class	CAuxWxSubsystemShutdowner
	An auxiliary global object used just to launch a final request to the wxSubsystem for shutdown: More...

class	CWXMainFrame
	The main frame of the wxWidgets application. More...

struct	TRequestToWxMainThread
	The data structure for each inter-thread request: More...

struct	TWxMainThreadData

Static Public Member Functions
static void	waitWxShutdownsIfNoWindows ()
	This method must be called in the destructor of the user class FROM THE MAIN THREAD, in order to wait for the shutdown of the wx thread if this was the last open window. More...

static bool	isConsoleApp ()
	Will be set to true at runtime if it's not detected a running wxApp instance. More...

static TWxMainThreadData &	GetWxMainThreadInstance ()

static void	wxMainThread ()
	This will be the "MAIN" of wxWidgets: It starts an application object and does not end until all the windows are closed. More...

static TRequestToWxMainThread *	popPendingWxRequest ()
	Thread-safe method to return the next pending request, or nullptr if there is none (After usage, FREE the memory!) More...

static void	pushPendingWxRequest (TRequestToWxMainThread *data)
	Thread-safe method to insert a new pending request (The memory must be dinamically allocated with "new T[1]", will be freed by receiver.) More...

static bool	createOneInstanceMainThread ()
	Thread-safe method to create one single instance of the main wxWidgets thread: it will create the thread only if it is not running yet. More...

static wxBitmap	getMRPTDefaultIcon ()

Static Public Attributes
static CAuxWxSubsystemShutdowner	global_wxsubsystem_shutdown

Static Private Attributes
static std::queue< TRequestToWxMainThread * > *	listPendingWxRequests = nullptr
	Do not access directly to this, use the thread-safe functions. More...

static std::mutex *	cs_listPendingWxRequests = nullptr

Member Function Documentation

◆ createOneInstanceMainThread()

bool WxSubsystem::createOneInstanceMainThread ( )

static

Thread-safe method to create one single instance of the main wxWidgets thread: it will create the thread only if it is not running yet.

Definition at line 1098 of file WxSubsystem.cpp.

References GetWxMainThreadInstance(), isConsoleApp_value, mrpt::gui::WxSubsystem::TWxMainThreadData::m_csWxMainThreadId, mrpt::gui::WxSubsystem::TWxMainThreadData::m_semWxMainThreadReady, mrpt::gui::WxSubsystem::TWxMainThreadData::m_wxMainThreadId, and mrpt::gui::WxSubsystem::CWXMainFrame::oneInstance.

Referenced by mrpt::gui::CBaseGUIWindow::createWxWindow(), and mrpt::hwdrivers::prepareVideoSourceFromUserSelection().

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◆ getMRPTDefaultIcon()

wxBitmap WxSubsystem::getMRPTDefaultIcon ( )

static

Definition at line 848 of file WxSubsystem.cpp.

References mrpt_default_icon_xpm.

Referenced by mrpt::gui::C3DWindowDialog::C3DWindowDialog(), mrpt::gui::CWindowDialog::CWindowDialog(), and mrpt::gui::CWindowDialogPlots::CWindowDialogPlots().

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◆ GetWxMainThreadInstance()

WxSubsystem::TWxMainThreadData & WxSubsystem::GetWxMainThreadInstance ( )

static

Definition at line 1080 of file WxSubsystem.cpp.

Referenced by createOneInstanceMainThread(), CDisplayWindow_WXAPP::OnExit(), CDisplayWindow_WXAPP::OnInit(), and wxMainThread().

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◆ isConsoleApp()

bool WxSubsystem::isConsoleApp ( )

static

Will be set to true at runtime if it's not detected a running wxApp instance.

For console apps, we'll create a new thread and run wxEntry from there. For GUI apps (MRPT-based Windows are a part of a user wxWidget apps), we must leave the control of message dispatching to the current main loop, so we cannot create a different threads, making things a little different (hence this variable).

Definition at line 54 of file WxSubsystem.cpp.

References isConsoleApp_value.

Referenced by mrpt::gui::CBaseGUIWindow::createWxWindow(), mrpt::gui::CBaseGUIWindow::destroyWxWindow(), waitWxShutdownsIfNoWindows(), and mrpt::gui::WxSubsystem::CAuxWxSubsystemShutdowner::~CAuxWxSubsystemShutdowner().

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◆ popPendingWxRequest()

WxSubsystem::TRequestToWxMainThread * WxSubsystem::popPendingWxRequest ( )

static

Thread-safe method to return the next pending request, or nullptr if there is none (After usage, FREE the memory!)

Definition at line 239 of file WxSubsystem.cpp.

◆ pushPendingWxRequest()

void WxSubsystem::pushPendingWxRequest ( WxSubsystem::TRequestToWxMainThread * data )

static

Thread-safe method to insert a new pending request (The memory must be dinamically allocated with "new T[1]", will be freed by receiver.)

Definition at line 261 of file WxSubsystem.cpp.

References mrpt::gui::WxSubsystem::CWXMainFrame::oneInstance.

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◆ waitWxShutdownsIfNoWindows()

void WxSubsystem::waitWxShutdownsIfNoWindows ( )

static

This method must be called in the destructor of the user class FROM THE MAIN THREAD, in order to wait for the shutdown of the wx thread if this was the last open window.

Definition at line 915 of file WxSubsystem.cpp.

References isConsoleApp().

Referenced by mrpt::gui::CBaseGUIWindow::destroyWxWindow(), and mrpt::gui::WxSubsystem::CAuxWxSubsystemShutdowner::~CAuxWxSubsystemShutdowner().

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