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408 lines
12 KiB
Markdown
408 lines
12 KiB
Markdown
# Interface definition
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```cpp
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class PowertoyModuleIface {
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public:
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virtual const wchar_t* get_name() = 0;
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virtual const wchar_t** get_events() = 0;
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virtual bool get_config(wchar_t* buffer, int *buffer_size) = 0;
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virtual void set_config(const wchar_t* config) = 0;
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virtual void call_custom_action(const wchar_t* action) {};
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virtual void enable() = 0;
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virtual void disable() = 0;
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virtual bool is_enabled() = 0;
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virtual intptr_t signal_event(const wchar_t* name, intptr_t data) = 0;
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virtual void register_system_menu_helper(PowertoySystemMenuIface* helper) = 0;
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virtual void signal_system_menu_action(const wchar_t* name) = 0;
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virtual void destroy() = 0;
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};
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typedef PowertoyModuleIface* (__cdecl *powertoy_create_func)();
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```
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# Runtime logic
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The PowerToys runner will, for each PowerToy DLL:
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- load the DLL,
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- call [`powertoy_create()`](#powertoy_create_func) to create the PowerToy.
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On the received object, the runner will call:
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- [`get_name()`](#get_name) to get the name of the PowerToy,
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- [`get_events()`](#get_events) to get the list of the events the PowerToy wants to subscribe to,
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- [`enable()`](#enable) to initialize the PowerToy.
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While running, the runner might call the following methods between create_powertoy()
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and destroy():
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- [`disable()`](#disable)/[`enable()`](#enable)/[`is_enabled()`](#is_enabled) to change or get the PowerToy's enabled state,
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- [`get_config()`](#get_config) to get the available configuration settings,
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- [`set_config()`](#set_config) to set settings after they have been edited in the Settings editor,
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- [`call_custom_action()`](#call_custom_action) when the user selects a custom action in the Settings editor,
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- [`signal_event()`](#signal_event) to send an event the PowerToy registered to.
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- [`register_system_menu_helper()`](#register_system_menu_helper) to pass object, responsible for handling customized system menus, to module.
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- [`signal_system_menu_action()`](#signal_system_menu_action) to send an event when action is taken on system menu item.
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When terminating, the runner will:
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- call [`disable()`](#disable),
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- call [`destroy()`](#destroy) which should free all the memory and delete the PowerToy object,
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- unload the DLL.
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# Method definition
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This section contains a more detailed description of each of the interface methods.
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## powertoy_create_func
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```cpp
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typedef PowertoyModuleIface* (__cdecl *powertoy_create_func)()
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```
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Typedef of the factory function that creates the PowerToy object.
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Must be exported by the DLL as `powertoy_create()`.
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Called by the PowerToys runner to initialize each PowerToy.
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It will be called only once before a call to [`destroy()`](#destroy) is made.
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The returned PowerToy should be in the disabled state. The runner will call the [`enable()`](#enable) method to start the PowerToy.
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In case of errors returns `nullptr`.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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extern "C" __declspec(dllexport) PowertoyModuleIface* __cdecl powertoy_create() {
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return new ExamplePowertoy();
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}
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ExamplePowertoy::ExamplePowertoy() {
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init_settings();
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}
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```
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## get_name
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```cpp
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virtual const wchar_t* get_name()
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```
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Returns the name of the PowerToy, it will be cached by the runner.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual const wchar_t* get_name() override {
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return L"Example Powertoy";
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}
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```
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## get_events
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```cpp
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virtual const wchar_t** get_events()
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```
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Returns a null-terminated table of the names of the events the PowerToy wants to subscribe to. Available events:
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* ll_keyboard
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* win_hook_event
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A nullptr can be returned to signal that the PowerToy does not want to subscribe to any event.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual const wchar_t** get_events() override {
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static const wchar_t* events[] = { ll_keyboard,
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win_hook_event,
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nullptr };
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return events;
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}
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```
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## get_config
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```
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virtual bool get_config(wchar_t* buffer, int *buffer_size)
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```
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Fills a buffer with the available configuration settings.
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If `buffer` is a null pointer or the buffer size is not large enough sets the required buffer size in 'buffer_size' and return false.
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Returns true if successful.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual bool get_config(wchar_t* buffer, int* buffer_size) override {
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HINSTANCE hinstance = reinterpret_cast<HINSTANCE>(&__ImageBase);
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// Create a Settings object.
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PowerToysSettings::Settings settings(hinstance, get_name());
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settings.set_description(L"Serves as an example powertoy, with example settings.");
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// Add an overview link to show in the Settings.
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settings.set_overview_link(L"https://github.com/microsoft/PowerToys");
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// Add a video link to show in the Settings.
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settings.set_video_link(L"https://www.youtube.com/watch?v=d3LHo2yXKoY&t=21462");
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// Add a bool property with a toggle editor.
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settings.add_bool_toogle(
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L"test_bool_toggle", // property name.
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L"This is what a BoolToggle property looks like", // description or resource id of the localized string.
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test_bool_prop // property value.
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);
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// More settings
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...
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// Add a custom action property. When using this settings type, the "call_custom_action()" method should be overriden as well.
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settings.add_custom_action(
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L"test_custom_action", // action name.
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L"This is what a CustomAction property looks like", // label above the field.
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L"Call a custom action", // button text.
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L"Press the button to call a custom action in the Example PowerToy" // display values / extended info.
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);
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return settings.serialize_to_buffer(buffer, buffer_size);
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}
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```
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## set_config
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```cpp
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virtual void set_config(const wchar_t* config)
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```
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After the user has changed the module settings in the Settings editor, the runner calls this method to pass to the module the updated values. It's a good place to save the settings as well.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual void set_config(const wchar_t* config) override {
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try {
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// Parse the PowerToysValues object from the received json string.
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PowerToysSettings::PowerToyValues _values =
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PowerToysSettings::PowerToyValues::from_json_string(config);
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// Update the bool property.
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if (_values.is_bool_value(L"test bool_toggle")) {
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test_bool_prop = _values.get_bool_value(L"test bool_toggle");
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}
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// More settings
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...
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save_settings();
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}
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catch (std::exception ex) {
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// Improper JSON.
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}
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}
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```
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## call_custom_action
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```cpp
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virtual void call_custom_action(const wchar_t* action)
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```
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Calls a custom action in response to the user pressing the custom action button in the Settings editor.
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This can be used to spawn custom editors defined by the PowerToy.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual void call_custom_action(const wchar_t* action) override {
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try {
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// Parse the action values, including name.
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PowerToysSettings::CustomActionObject action_object =
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PowerToysSettings::CustomActionObject::from_json_string(action);
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if (action_object.get_name() == L"test_custom_action") {
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// Custom action code to increase and show a counter.
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++this->test_custom_action_num_calls;
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std::wstring msg(L"I have been called ");
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msg += std::to_wstring(this->test_custom_action_num_calls);
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msg += L" time(s).";
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MessageBox(NULL, msg.c_str(), L"Custom action call.", MB_OK | MB_TOPMOST);
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}
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}
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catch (std::exception ex) {
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// Improper JSON.
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}
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}
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```
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## enable
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```cpp
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virtual void enable()
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```
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Enables the PowerToy.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual void enable() {
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m_enabled = true;
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}
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```
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## disable
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```cpp
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virtual void disable()
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```
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Disables the PowerToy, should free as much memory as possible.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual void disable() {
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m_enabled = false;
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}
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```
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## is_enabled
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```cpp
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virtual bool is_enabled() = 0;
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```
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Returns the PowerToy state.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual bool is_enabled() override {
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return m_enabled;
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}
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```
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## signal_event
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```cpp
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virtual intptr_t signal_event(const wchar_t* name, intptr_t data) = 0;
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```
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Handle event. Only the events the PowerToy subscribed to will be signaled.
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The data argument and return value meaning are event-specific:
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* ll_keyboard: see [`lowlevel_keyboard_event_data.h`](./lowlevel_keyboard_event_data.h).
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* win_hook_event: see [`win_hook_event_data.h`](./win_hook_event_data.h)
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Please note that some of the events are currently being signalled from a separate thread.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual intptr_t signal_event(const wchar_t* name, intptr_t data) override {
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if (wcscmp(name, ll_keyboard) == 0) {
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auto& event = *(reinterpret_cast<LowlevelKeyboardEvent*>(data));
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// Return 1 if the keypress is to be suppressed (not forwarded to Windows),
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// otherwise return 0.
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return 0;
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} else if (wcscmp(name, win_hook_event) == 0) {
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auto& event = *(reinterpret_cast<WinHookEvent*>(data));
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// Return value is ignored
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return 0;
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}
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return 0;
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}
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```
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## register_system_menu_helper
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```cpp
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virtual void register_system_menu_helper(PowertoySystemMenuIface* helper) = 0;
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```
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Register helper class to handle all system menu items related actions. Creation, deletion
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and all other actions taken on system menu item will be handled by provided class.
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Module will be informed when action is taken on any item created on request of the module.
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## signal_system_menu_action
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```cpp
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virtual void signal_system_menu_action(const wchar_t* name) = 0;
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```
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Runner invokes this API when action is taken on item created on request from the module.
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Item name is passed as an argument, so that module can distinguish between different menu items.
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## destroy
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```cpp
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virtual void destroy()
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```
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Destroy the PowerToy and free all memory.
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Sample code from [`the example PowerToy`](/src/modules/example_powertoy/dllmain.cpp):
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```cpp
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virtual void destroy() override {
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delete this;
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}
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```
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## Powertoys system menu helper interface
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Interface for helper class responsible for handling all system menu related actions.
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```cpp
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class PowertoySystemMenuIface {
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public:
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struct ItemInfo {
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std::wstring name{};
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bool enable{ false };
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bool checkBox{ false };
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};
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virtual void SetConfiguration(PowertoyModuleIface* module, const std::vector<ItemInfo>& config) = 0;
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virtual void ProcessSelectedItem(PowertoyModuleIface* module, HWND window, const wchar_t* itemName) = 0;
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};
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```
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## ItemInfo
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```cpp
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struct ItemInfo {
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std::wstring name{};
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bool enable{ false };
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bool checkBox{ false };
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};
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```
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Structure containing all relevant information for system menu item: name (and hotkey if available), item
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status at creation (enabled/disabled) and whether check box will appear next to item name when action is taken.
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## SetConfiguration
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```cpp
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virtual void SetConfiguration(PowertoyModuleIface* module, const std::vector<ItemInfo>& config) = 0;
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```
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Module should use this interface to inform system menu helper class which custom system menu items to create.
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## ProcessSelectedItem
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```cpp
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virtual void ProcessSelectedItem(PowertoyModuleIface* module, HWND window, const wchar_t* itemName) = 0;
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```
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Process action taken on specific system menu item.
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# Code organization
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### [`powertoy_module_interface.h`](/src/modules/example_powertoy/powertoy_module_interface.h)
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Contains the PowerToys interface definition.
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### [`powertoy_system_menu.h`](/src/modules/example_powertoy/powertoy_system_module.h)
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Contains the PowerToys system menu helper interface definition.
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### [`lowlevel_keyboard_event_data.h`](/src/modules/example_powertoy/lowlevel_keyboard_event_data.h)
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Contains the `LowlevelKeyboardEvent` structure that's passed to `signal_event` for `ll_keyboard` events.
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### [`win_hook_event_data.h`](/src/modules/example_powertoy/win_hook_event_data.h)
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Contains the `WinHookEvent` structure that's passed to `signal_event` for `win_hook_event` events.
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