Add API to access battery power state

Done:
- X11, server (tested)
- Windows (developed, would be nice to retest)
- OSX (not tested)
Prepared (not developed):
- Android (code is here, but may not compile)
- iphone
- winrt
- bb10
- haiku
- javascript

4 files changed, 148 insertions, 1 deletions

diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index 201008b1db..d570d64acf 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -259,6 +259,8 @@ void OS_JavaScript::initialize(const VideoMode& p_desired,int p_video_driver,int
 	physics_2d_server->init();
 
 	input = memnew( InputDefault );
+	
+	power_manager = memnew( PowerJavascript );
 
 #define EM_CHECK(ev) if (result!=EMSCRIPTEN_RESULT_SUCCESS)\
 	ERR_PRINTS("Error while setting " #ev " callback: Code " + itos(result))
@@ -853,8 +855,19 @@ String OS_JavaScript::get_joy_guid(int p_device) const {
 	return input->get_joy_guid_remapped(p_device);
 }
 
-OS_JavaScript::OS_JavaScript(GFXInitFunc p_gfx_init_func,void*p_gfx_init_ud, GetDataDirFunc p_get_data_dir_func) {
+PowerState OS_JavaScript::get_power_state() {
+	return power_manager->get_power_state();
+}
+
+int OS_JavaScript::get_power_seconds_left() {
+	return power_manager->get_power_seconds_left();
+}
 
+int OS_JavaScript::get_power_percent_left() {
+	return power_manager->get_power_percent_left();
+}
+
+OS_JavaScript::OS_JavaScript(GFXInitFunc p_gfx_init_func,void*p_gfx_init_ud, GetDataDirFunc p_get_data_dir_func) {
 	gfx_init_func=p_gfx_init_func;
 	gfx_init_ud=p_gfx_init_ud;
 	last_button_mask=0;
diff --git a/platform/javascript/os_javascript.h b/platform/javascript/os_javascript.h
index 582f128ce8..5f6051bedb 100644
--- a/platform/javascript/os_javascript.h
+++ b/platform/javascript/os_javascript.h
@@ -32,6 +32,7 @@
 #include "os/input.h"
 #include "drivers/unix/os_unix.h"
 #include "os/main_loop.h"
+#include "power_javascript.h"
 #include "servers/physics/physics_server_sw.h"
 #include "servers/audio_server.h"
 #include "servers/physics_2d/physics_2d_server_sw.h"
@@ -81,6 +82,8 @@ private:
 
 	GetDataDirFunc get_data_dir_func;
 
+	PowerJavascript *power_manager;
+
 #ifdef JAVASCRIPT_EVAL_ENABLED
 	JavaScript* javascript_eval;
 #endif
@@ -174,6 +177,10 @@ public:
 	virtual bool is_joy_known(int p_device);
 	virtual String get_joy_guid(int p_device) const;
 	bool joy_connection_changed(int p_type, const EmscriptenGamepadEvent *p_event);
+	
+	virtual PowerState get_power_state();
+	virtual int get_power_seconds_left();
+	virtual int get_power_percent_left();
 
 	OS_JavaScript(GFXInitFunc p_gfx_init_func,void*p_gfx_init_ud, GetDataDirFunc p_get_data_dir_func);
 	~OS_JavaScript();
diff --git a/platform/javascript/power_javascript.cpp b/platform/javascript/power_javascript.cpp
new file mode 100644
index 0000000000..d535ea4a5a
--- /dev/null
+++ b/platform/javascript/power_javascript.cpp
@@ -0,0 +1,76 @@
+/*************************************************************************/
+/*  power_javascript.cpp                                                 */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+
+#include "core/error_macros.h"
+#include "power_javascript.h"
+
+
+bool PowerJavascript::UpdatePowerInfo() {
+	// TODO Javascript implementation
+	return false;
+}
+
+PowerState PowerJavascript::get_power_state() {
+	if (UpdatePowerInfo()) {
+		return power_state;
+	}
+	else {
+		WARN_PRINT("Power management is not implemented on this platform, defaulting to POWERSTATE_UNKNOWN");
+		return POWERSTATE_UNKNOWN;
+	}
+}
+
+int PowerJavascript::get_power_seconds_left() {
+	if (UpdatePowerInfo()) {
+		return nsecs_left;
+	}
+	else {
+		WARN_PRINT("Power management is not implemented on this platform, defaulting to -1");
+		return -1;
+	}
+}
+
+int PowerJavascript::get_power_percent_left() {
+	if (UpdatePowerInfo()) {
+		return percent_left;
+	}
+	else {
+		WARN_PRINT("Power management is not implemented on this platform, defaulting to -1");
+		return -1;
+	}
+}
+
+
+PowerJavascript::PowerJavascript() : nsecs_left(-1), percent_left(-1), power_state(POWERSTATE_UNKNOWN) {
+
+}
+
+PowerJavascript::~PowerJavascript() {
+}
\ No newline at end of file
diff --git a/platform/javascript/power_javascript.h b/platform/javascript/power_javascript.h
new file mode 100644
index 0000000000..e93737f98a
--- /dev/null
+++ b/platform/javascript/power_javascript.h
@@ -0,0 +1,51 @@
+/*************************************************************************/
+/*  power_javascript.h                                                   */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+
+#ifndef PLATFORM_JAVASCRIPT_POWER_JAVASCRIPT_H_
+#define PLATFORM_JAVASCRIPT_POWER_JAVASCRIPT_H_
+
+class PowerJavascript {
+private:
+	int nsecs_left;
+	int percent_left;
+	PowerState power_state;
+
+	bool UpdatePowerInfo();
+
+public:
+	PowerJavascript();
+	virtual ~PowerJavascript();
+
+	PowerState get_power_state();
+	int get_power_seconds_left();
+	int get_power_percent_left();
+};
+
+#endif /* PLATFORM_JAVASCRIPT_POWER_JAVASCRIPT_H_ */
\ No newline at end of file