WinRT: simulate keyboard events on Windows Phone 8 back-button presses
Pressing the hardware back button on a Windows Phone 8 device will now cause SDL to emit a pair of key-down and key-up events, with the SDL scancode, SDL_SCANCODE_AC_BACK. By default, if WinRT's native back-button-press events are not explicitly marked as 'handled', then Windows Phone will terminate the app. More details on Microsoft's reasoning behind this can be found on MSDN, at http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj247550(v=vs.105).aspx To mark back-button-press events as 'handled', set SDL_HINT_WINRT_HANDLE_BACK_BUTTON to 1. Setting it to anything else will cause these events to not be marked as 'handled'. Due to limitations in Windows Phone's APIs, SDL will emit a virtual key-up event immediately after the back button's key-down event is registered. Unfortunately, Windows Phone 8 only allows one to register for back-button-press events, and not back-button-release events.main
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@ -378,6 +378,15 @@ extern "C" {
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*/
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#define SDL_HINT_WINRT_PRIVACY_POLICY_LABEL "SDL_HINT_WINRT_PRIVACY_POLICY_LABEL"
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/** \brief If set to 1, back button press events on Windows Phone 8+ will be marked as handled.
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*
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* TODO, WinRT: document SDL_HINT_WINRT_HANDLE_BACK_BUTTON need and use
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* For now, more details on why this is needed can be found at the
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* beginning of the following web page:
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* http://msdn.microsoft.com/en-us/library/windowsphone/develop/jj247550(v=vs.105).aspx
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*/
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#define SDL_HINT_WINRT_HANDLE_BACK_BUTTON "SDL_HINT_WINRT_HANDLE_BACK_BUTTON"
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/**
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* \brief An enumeration of hint priorities
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*/
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@ -19,6 +19,10 @@ using namespace Windows::System;
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using namespace Windows::UI::Core;
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using namespace Windows::UI::Input;
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#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
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using namespace Windows::Phone::UI::Input;
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#endif
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/* SDL includes */
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extern "C" {
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@ -31,6 +35,7 @@ extern "C" {
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#include "SDL_render.h"
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#include "../../video/SDL_sysvideo.h"
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//#include "../../SDL_hints_c.h"
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#include "../../events/SDL_keyboard_c.h"
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#include "../../events/SDL_mouse_c.h"
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#include "../../events/SDL_windowevents_c.h"
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#include "../../render/SDL_sysrender.h"
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@ -316,6 +321,11 @@ void SDL_WinRTApp::SetWindow(CoreWindow^ window)
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window->KeyUp +=
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ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(this, &SDL_WinRTApp::OnKeyUp);
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#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
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HardwareButtons::BackPressed +=
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ref new EventHandler<BackPressedEventArgs^>(this, &SDL_WinRTApp::OnBackButtonPressed);
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#endif
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#if WINAPI_FAMILY == WINAPI_FAMILY_APP // for Windows 8/8.1/RT apps... (and not Phone apps)
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// Make sure we know when a user has opened the app's settings pane.
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// This is needed in order to display a privacy policy, which needs
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@ -597,3 +607,19 @@ void SDL_WinRTApp::OnKeyUp(Windows::UI::Core::CoreWindow^ sender, Windows::UI::C
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{
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WINRT_ProcessKeyUpEvent(args);
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}
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#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
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void SDL_WinRTApp::OnBackButtonPressed(Platform::Object^ sender, Windows::Phone::UI::Input::BackPressedEventArgs^ args)
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{
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SDL_SendKeyboardKey(SDL_PRESSED, SDL_SCANCODE_AC_BACK);
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SDL_SendKeyboardKey(SDL_RELEASED, SDL_SCANCODE_AC_BACK);
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const char *hint = SDL_GetHint(SDL_HINT_WINRT_HANDLE_BACK_BUTTON);
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if (hint) {
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if (*hint == '1') {
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args->Handled = true;
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}
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}
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}
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#endif
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@ -45,6 +45,10 @@ protected:
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void OnKeyDown(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args);
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void OnKeyUp(Windows::UI::Core::CoreWindow^ sender, Windows::UI::Core::KeyEventArgs^ args);
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#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
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void OnBackButtonPressed(Platform::Object^ sender, Windows::Phone::UI::Input::BackPressedEventArgs^ args);
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#endif
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private:
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bool m_windowClosed;
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bool m_windowVisible;
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