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getkey: add a "feature function" to create application-wide shortcuts

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This change introduces the global "feature function" that can be
enabled in getkey() to receive events, and use them for
application-wide features. This would be useful, for instance, to
toggle screen backlight with a different key combination that the
default, to capture screenshots, or to implement a catalog.

When enabled, the feature function is present with all new events and
can perform actions, then decide whether or not to return them from
getkey().
This commit is contained in:
Lephe 2021-05-05 14:46:47 +02:00
parent dbba1d7b1d
commit 4c3fcf66a7
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GPG key ID: 1BBA026E13FC0495
2 changed files with 53 additions and 2 deletions
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29
include/gint/keyboard.h
View file

@ -212,17 +212,23 @@ enum {
GETKEY_REP_ALL = 0x20,
/* Enable custom repeat profiles; see getkey_set_repeat_profile() */
GETKEY_REP_PROFILE = 0x40,
/* Enable application shortcuts; see getkey_set_feature_function() */
GETKEY_FEATURES = 0x80,
/* No modifiers */
GETKEY_NONE = 0x00,
/* Default settings of getkey() */
GETKEY_DEFAULT = 0x5f,
GETKEY_DEFAULT = 0xdf,
};
/* getkey_profile_t: Custom repeat profile function
See getkey_set_repeat_profile() for details. */
typedef int (*getkey_profile_t)(int key, int duration, int count);
/* getkey_feature_t: Custom feature function
See getkey_set_feature_function() for details. */
typedef bool (*getkey_feature_t)(key_event_t event);
/* getkey_opt(): Enhanced getkey()
This function enhances getkey() with more general features. An
@ -288,6 +294,27 @@ getkey_profile_t getkey_repeat_profile(void);
the repeat exactly when needed. */
void getkey_set_repeat_profile(getkey_profile_t profile);
/* getkey_feature_function(): Get the current feature function */
getkey_feature_t getkey_feature_function(void);
/* getkey_set_feature_function(): Set the global feature function
The feature function can be used to extend getkey() with application-wide
shortcuts, in a way similar to the CATALOG, CAPTURE or OFF functions of the
original getkey(). The feature function can be set globally at the
application level, and thus does not require every call site that uses
getkey() to support the shortcuts explicitly.
The feature function receives events when they are generated; if can them
process them, and return either true to accept the event (preventing
getkey() from returning it) or false to refuse the event (in which case it
is returned normally).
The feature function is enabled by default and be disabled by removing the
GETKEY_FEATURES flag in getkey_opt(). Setting function=NULL disables the
functionality. */
void getkey_set_feature_function(getkey_feature_t function);
//---
// Key code functions
//---

26
src/keysc/getkey.c
View file

@ -15,6 +15,8 @@
static int rep_first = 400, rep_next = 40;
/* Repeat profile function */
static getkey_profile_t repeat_profile = NULL;
/* Feature function */
static getkey_feature_t feature_function = NULL;
/* Repeater specification */
static enum { NONE, ALL, ARROWS, FILTER } repeat_mode;
@ -71,7 +73,15 @@ key_event_t getkey_opt(int opt, volatile int *timeout)
e.key == KEY_MENU && !e.shift && !e.alpha)
gint_osmenu();
else if(e.type == KEYEV_DOWN || e.type == KEYEV_HOLD) break;
else if(e.type == KEYEV_DOWN || e.type == KEYEV_HOLD)
{
/* Custom global features */
bool accepted = false;
if((opt & GETKEY_FEATURES) && feature_function)
accepted = feature_function(e);
/* Return if the even has not been accepted yet */
if(!accepted) break;
}
}
keydev_set_transform(d, tr0);
@ -96,3 +106,17 @@ void getkey_set_repeat_profile(getkey_profile_t profile)
{
repeat_profile = profile;
}
/* getkey_feature_function(): Get the current feature function */
getkey_feature_t getkey_feature_function(void)
{
return feature_function;
}
/* getkey_set_feature_function(): Set the global feature function */
void getkey_set_feature_function(getkey_feature_t function)
{
feature_function = function;
}