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Implement reusable cursors on HTML5

master
Marius Petcu 2018-12-25 18:01:03 +02:00
parent 3d501ef57e
commit 145ca62bf7
1 changed files with 52 additions and 39 deletions
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91
defos/src/defos_html5.cpp
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@ -7,8 +7,13 @@
#include <emscripten.h>
#include <stdlib.h>
struct CustomCursor {
int ref_count;
char url[];
};
static const char * current_cursor = "default";
static bool current_cursor_needs_free = false;
static CustomCursor * current_custom_cursor = NULL;
static bool is_maximized = false;
static bool is_mouse_inside = false;
static bool is_cursor_visible = true;
@ -38,7 +43,7 @@ extern "C" void EMSCRIPTEN_KEEPALIVE defos_emit_event_from_js(DefosEvent event)
void defos_init() {
current_cursor = "default";
current_cursor_needs_free = false;
current_custom_cursor = NULL;
EM_ASM_({
Module.__defosjs_mouseenter_listener = function () {
_defos_emit_event_from_js($0);
@ -86,9 +91,9 @@ void defos_init() {
}
void defos_final() {
if (current_cursor_needs_free) {
current_cursor_needs_free = false;
free((void*)current_cursor);
if (current_custom_cursor) {
defos_gc_custom_cursor(current_custom_cursor);
current_custom_cursor = NULL;
}
EM_ASM(
Module.canvas.removeEventListener('mouseenter', Module.__defosjs_mouseenter_listener);
@ -309,6 +314,42 @@ bool defos_is_cursor_locked() {
return is_cursor_locked;
}
void *defos_load_cursor_html5(const char *url) {
size_t len = strlen(url);
CustomCursor * cursor = (CustomCursor*)malloc(sizeof(CustomCursor) + len + 12);
cursor->ref_count = 1;
strcpy(cursor->url, "url(");
strcpy(cursor->url + 4, url);
strcpy(cursor->url + 4 + len, "), auto");
return cursor;
}
void defos_gc_custom_cursor(void *_cursor) {
CustomCursor * cursor = (CustomCursor*)_cursor;
if (!cursor) { return; }
cursor->ref_count -= 1;
if (!cursor->ref_count) {
free(cursor);
}
}
static void update_cursor() {
if (is_cursor_visible) {
EM_ASM_({Module.canvas.style.cursor = UTF8ToString($0);}, current_cursor);
}
}
void defos_set_custom_cursor(void *_cursor) {
CustomCursor * cursor = (CustomCursor*)_cursor;
cursor->ref_count += 1;
defos_gc_custom_cursor(current_custom_cursor);
current_cursor = cursor->url;
current_custom_cursor = cursor;
update_cursor();
}
static const char * get_cursor(DefosCursor cursor) {
switch (cursor) {
case DEFOS_CURSOR_ARROW:
@ -325,45 +366,17 @@ static const char * get_cursor(DefosCursor cursor) {
}
void defos_set_cursor(DefosCursor cursor) {
if (current_cursor_needs_free) {
free((void*)current_cursor);
}
defos_gc_custom_cursor(current_custom_cursor);
current_cursor = get_cursor(cursor);
current_cursor_needs_free = false;
if (is_cursor_visible) {
EM_ASM_({Module.canvas.style.cursor = UTF8ToString($0);}, current_cursor);
}
}
extern void defos_set_custom_cursor_html5(const char *url) {
size_t len = strlen(url);
char * buffer = (char*)malloc(len + 12);
strcpy(buffer, "url(");
strcpy(buffer + 4, url);
strcpy(buffer + 4 + len, "), auto");
if (current_cursor_needs_free) {
free((void*)current_cursor);
}
current_cursor = buffer;
current_cursor_needs_free = true;
if (is_cursor_visible) {
EM_ASM_({Module.canvas.style.cursor = UTF8ToString($0);}, current_cursor);
}
current_custom_cursor = NULL;
update_cursor();
}
void defos_reset_cursor() {
if (current_cursor_needs_free) {
free((void*)current_cursor);
}
defos_gc_custom_cursor(current_custom_cursor);
current_cursor = "default";
current_cursor_needs_free = false;
if (is_cursor_visible) {
EM_ASM(Module.canvas.style.cursor = 'default';);
}
current_custom_cursor = NULL;
update_cursor();
}
void defos_get_displays(dmArray<DisplayInfo> &displayList) {