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Add SDL_TouchDeviceType enum and SDL_GetTouchDeviceType(SDL_TouchID id).

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Touch device types include SDL_TOUCH_DEVICE_DIRECT (a touch screen with window-relative coordinates for touches), SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE (a trackpad-style device with absolute device coordinates), and SDL_TOUCH_DEVICE_INDIRECT_RELATIVE (a trackpad-style device with screen cursor-relative coordinates).

Phone screens are an example of a direct device type. Mac trackpads are the indirect-absolute touch device type. The Apple TV remote is an indirect-relative touch device type.
This commit is contained in:
Alex Szpakowski
2018-11-10 16:15:48 -04:00
parent 2196e5765c
commit 5029d50ea8
15 changed files with 109 additions and 15 deletions
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13
src/events/SDL_touch.c
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@@ -86,6 +86,16 @@ SDL_GetTouch(SDL_TouchID id)
return SDL_touchDevices[index];
}
SDL_TouchDeviceType
SDL_GetTouchDeviceType(SDL_TouchID id)
{
SDL_Touch *touch = SDL_GetTouch(id);
if (touch) {
return touch->type;
}
return SDL_TOUCH_DEVICE_INVALID;
}
static int
SDL_GetFingerIndex(const SDL_Touch * touch, SDL_FingerID fingerid)
{
@@ -133,7 +143,7 @@ SDL_GetTouchFinger(SDL_TouchID touchID, int index)
}
int
SDL_AddTouch(SDL_TouchID touchID, const char *name)
SDL_AddTouch(SDL_TouchID touchID, SDL_TouchDeviceType type, const char *name)
{
SDL_Touch **touchDevices;
int index;
@@ -163,6 +173,7 @@ SDL_AddTouch(SDL_TouchID touchID, const char *name)
/* we're setting the touch properties */
SDL_touchDevices[index]->id = touchID;
SDL_touchDevices[index]->type = type;
SDL_touchDevices[index]->num_fingers = 0;
SDL_touchDevices[index]->max_fingers = 0;
SDL_touchDevices[index]->fingers = NULL;

3
src/events/SDL_touch_c.h
View File

@@ -27,6 +27,7 @@
typedef struct SDL_Touch
{
SDL_TouchID id;
SDL_TouchDeviceType type;
int num_fingers;
int max_fingers;
SDL_Finger** fingers;
@@ -37,7 +38,7 @@ typedef struct SDL_Touch
extern int SDL_TouchInit(void);
/* Add a touch, returning the index of the touch, or -1 if there was an error. */
extern int SDL_AddTouch(SDL_TouchID id, const char *name);
extern int SDL_AddTouch(SDL_TouchID id, SDL_TouchDeviceType type, const char *name);
/* Get the touch with a given id */
extern SDL_Touch *SDL_GetTouch(SDL_TouchID id);