86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
#define DVX_WIDGET_IMPL
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// widgetClass.c -- Widget class table, API registry, and dynamic registration
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//
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// widgetClassTable is a stb_ds dynamic array. Widget DXEs call
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// wgtRegisterClass() during wgtRegister() to append their class
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// definition and receive a runtime type ID. No widget types are
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// known at compile time.
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//
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// The API registry uses an stb_ds string hashmap for O(1) lookup.
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// Each widget DXE calls wgtRegisterApi("name", &sApi) during
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// wgtRegister(). App/core code calls wgtGetApi("name") to get
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// the API pointer, then casts and calls through it.
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#include "dvxWidgetPlugin.h"
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#include "stb_ds.h"
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#include <string.h>
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// stb_ds dynamic array of class pointers. Grows on each
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// wgtRegisterClass() call. Index = type ID.
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const WidgetClassT **widgetClassTable = NULL;
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// stb_ds string hashmap: key = widget name, value = API pointer
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typedef struct {
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char *key; // stb_ds string key (heap-allocated by shput)
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const void *value;
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} ApiMapEntryT;
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static ApiMapEntryT *sApiMap = NULL;
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// ============================================================
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// wgtGetApi
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// ============================================================
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//
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// Look up a widget API by name. O(1) via stb_ds string hashmap.
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// Returns NULL if the widget is not loaded. Callers should still
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// cache the result in a static local to skip even the hash.
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const void *wgtGetApi(const char *name) {
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if (!name) {
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return NULL;
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}
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int32_t idx = shgeti(sApiMap, name);
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if (idx < 0) {
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return NULL;
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}
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return sApiMap[idx].value;
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}
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// ============================================================
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// wgtRegisterApi
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// ============================================================
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//
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// Register a widget's public API struct under a name. Called by
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// each widget DXE during wgtRegister().
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void wgtRegisterApi(const char *name, const void *api) {
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if (!name || !api) {
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return;
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}
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shput(sApiMap, name, api);
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}
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// ============================================================
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// wgtRegisterClass
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// ============================================================
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//
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// Appends a class to the table and returns the assigned type ID.
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// The ID is simply the array index.
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int32_t wgtRegisterClass(const WidgetClassT *wclass) {
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if (!wclass) {
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return -1;
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}
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int32_t id = arrlen(widgetClassTable);
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arrput(widgetClassTable, wclass);
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return id;
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}
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