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IME Composition Truncation + SDL_IsTextInputShown + SDL_ClearComposition (#5398)

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* Fixes for IME Composition Truncation + Addition of SDL_ClearComposition, SDL_IsTextInputShown

* Fixed: Documentation and code style issues raised during code review.
This commit is contained in:
Zach Reedy
2022-03-11 17:45:17 -05:00
committed by GitHub
parent 9de97e19cc
commit d14a126383
12 changed files with 210 additions and 12 deletions
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15
include/SDL_events.h
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@@ -102,6 +102,7 @@ typedef enum
SDL_KEYMAPCHANGED, /**< Keymap changed due to a system event such as an
input language or keyboard layout change.
*/
SDL_TEXTEDITING_EXT, /**< Extended keyboard text editing (composition) */
/* Mouse events */
SDL_MOUSEMOTION = 0x400, /**< Mouse moved */
@@ -243,6 +244,19 @@ typedef struct SDL_TextEditingEvent
Sint32 length; /**< The length of selected editing text */
} SDL_TextEditingEvent;
/**
* \brief Extended keyboard text editing event structure (event.editExt.*) when text would be
* truncated if stored in the text buffer SDL_TextEditingEvent
*/
typedef struct SDL_TextEditingExtEvent
{
Uint32 type; /**< ::SDL_TEXTEDITING_EXT */
Uint32 timestamp; /**< In milliseconds, populated using SDL_GetTicks() */
Uint32 windowID; /**< The window with keyboard focus, if any */
char* text; /**< The editing text, which should be freed with SDL_free(), and will not be NULL */
Sint32 start; /**< The start cursor of selected editing text */
Sint32 length; /**< The length of selected editing text */
} SDL_TextEditingExtEvent;
#define SDL_TEXTINPUTEVENT_TEXT_SIZE (32)
/**
@@ -601,6 +615,7 @@ typedef union SDL_Event
SDL_WindowEvent window; /**< Window event data */
SDL_KeyboardEvent key; /**< Keyboard event data */
SDL_TextEditingEvent edit; /**< Text editing event data */
SDL_TextEditingExtEvent editExt; /**< Extended text editing event data */
SDL_TextInputEvent text; /**< Text input event data */
SDL_MouseMotionEvent motion; /**< Mouse motion event data */
SDL_MouseButtonEvent button; /**< Mouse button event data */

11
include/SDL_hints.h
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@@ -579,6 +579,17 @@ extern "C" {
*/
#define SDL_HINT_IME_SHOW_UI "SDL_IME_SHOW_UI"
/**
* \brief A variable to control if extended IME text support is enabled.
* If enabled then SDL_TextEditingExtEvent will be issued if the text would be truncated otherwise.
* Additionally SDL_TextInputEvent will be dispatched multiple times so that it is not truncated.
*
* The variable can be set to the following values:
* "0" - Legacy behavior. Text can be truncated, no heap allocations. (default)
* "1" - Modern behavior.
*/
#define SDL_HINT_IME_SUPPORT_EXTENDED_TEXT "SDL_IME_SUPPORT_EXTENDED_TEXT"
/**
* \brief A variable controlling whether the home indicator bar on iPhone X
* should be hidden.

18
include/SDL_keyboard.h
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@@ -268,6 +268,24 @@ extern DECLSPEC SDL_bool SDLCALL SDL_IsTextInputActive(void);
*/
extern DECLSPEC void SDLCALL SDL_StopTextInput(void);
/**
* Dismiss the composition window/IME without disabling the subsystem.
*
* \since This function is available since SDL 2.0.22
*
* \sa SDL_StartTextInput
* \sa SDL_StopTextInput
*/
extern DECLSPEC void SDLCALL SDL_ClearComposition(void);
/**
* Returns if an IME Composite or Candidate window is currently shown.
*
* \since This function is available since SDL 2.0.22
*
*/
extern DECLSPEC SDL_bool SDLCALL SDL_IsTextInputShown(void);
/**
* Set the rectangle used to type Unicode text inputs.
*