[js] screen.availHeight (here it is 16 * box.height)

src/ecmascript/spidermonkey.c

@@ -32,6 +32,7 @@
 #include "ecmascript/spidermonkey/location.h"
 #include "ecmascript/spidermonkey/localstorage.h"
 #include "ecmascript/spidermonkey/navigator.h"
+#include "ecmascript/spidermonkey/screen.h"
 #include "ecmascript/spidermonkey/unibar.h"
 #include "ecmascript/spidermonkey/window.h"
 #include "intl/gettext/libintl.h"
@@ -215,7 +216,7 @@ spidermonkey_get_interpreter(struct ecmascript_interpreter *interpreter)
 {
 	JSContext *ctx;
 	JSObject *console_obj, *document_obj, /* *forms_obj,*/ *history_obj, *location_obj,
-	         *statusbar_obj, *menubar_obj, *navigator_obj, *localstorage_obj;
+	         *statusbar_obj, *menubar_obj, *navigator_obj, *localstorage_obj, *screen_obj;
 
 	static int initialized = 0;
 
@@ -303,6 +304,16 @@ spidermonkey_get_interpreter(struct ecmascript_interpreter *interpreter)
 		goto release_and_fail;
 	}
 
+	screen_obj = spidermonkey_InitClass(ctx, window_obj, NULL,
+					      &screen_class, NULL, 0,
+					      screen_props,
+					      NULL,
+					      NULL, NULL);
+
+	if (!screen_obj) {
+		goto release_and_fail;
+	}
+
 	menubar_obj = JS_InitClass(ctx, window_obj, nullptr,
 				   &menubar_class, NULL, 0,
 				   unibar_props, NULL,

src/ecmascript/spidermonkey/Makefile

@@ -2,6 +2,6 @@ top_builddir=../../..
 include $(top_builddir)/Makefile.config
 INCLUDES += $(SPIDERMONKEY_CFLAGS)
 
-OBJS = console.o document.o element.c form.o heartbeat.o location.o localstorage.o localstorage-db.o navigator.o unibar.o window.o
+OBJS = console.o document.o element.o form.o heartbeat.o location.o localstorage.o localstorage-db.o navigator.o screen.o unibar.o window.o
 
 include $(top_srcdir)/Makefile.lib

src/ecmascript/spidermonkey/meson.build

@@ -1,3 +1,3 @@
 #INCLUDES += $(SPIDERMONKEY_CFLAGS)
 
-srcs += files('console.c', 'document.c', 'element.c', 'form.c', 'heartbeat.c', 'location.c', 'localstorage.c', 'localstorage-db.c', 'navigator.c', 'unibar.c', 'window.c')
+srcs += files('console.c', 'document.c', 'element.c', 'form.c', 'heartbeat.c', 'location.c', 'localstorage.c', 'localstorage-db.c', 'navigator.c', 'screen.c', 'unibar.c', 'window.c')

src/ecmascript/spidermonkey/screen.c

@@ -0,0 +1,102 @@
+/* The SpiderMonkey location and history objects implementation. */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "elinks.h"
+
+#include "ecmascript/spidermonkey/util.h"
+#include <jsfriendapi.h>
+
+#include "bfu/dialog.h"
+#include "cache/cache.h"
+#include "cookies/cookies.h"
+#include "dialogs/menu.h"
+#include "dialogs/status.h"
+#include "document/html/frames.h"
+#include "document/document.h"
+#include "document/forms.h"
+#include "document/view.h"
+#include "ecmascript/ecmascript.h"
+#include "ecmascript/spidermonkey/screen.h"
+#include "ecmascript/spidermonkey/window.h"
+#include "intl/gettext/libintl.h"
+#include "main/select.h"
+#include "osdep/newwin.h"
+#include "osdep/sysname.h"
+#include "protocol/http/http.h"
+#include "protocol/uri.h"
+#include "session/history.h"
+#include "session/location.h"
+#include "session/session.h"
+#include "session/task.h"
+#include "terminal/tab.h"
+#include "terminal/terminal.h"
+#include "util/conv.h"
+#include "util/memory.h"
+#include "util/string.h"
+#include "viewer/text/draw.h"
+#include "viewer/text/form.h"
+#include "viewer/text/link.h"
+#include "viewer/text/vs.h"
+
+JSClassOps screen_ops = {
+	JS_PropertyStub, nullptr,
+	JS_PropertyStub, JS_StrictPropertyStub,
+	nullptr, nullptr, nullptr, nullptr
+};
+
+JSClass screen_class = {
+	"screen",
+	JSCLASS_HAS_PRIVATE,
+	&screen_ops
+};
+
+static bool screen_get_property_availHeight(JSContext *ctx, unsigned int argc, JS::Value *vp);
+
+JSPropertySpec screen_props[] = {
+	JS_PSG("availHeight",	screen_get_property_availHeight, JSPROP_ENUMERATE),
+	JS_PS_END
+};
+
+static bool
+screen_get_property_availHeight(JSContext *ctx, unsigned int argc, JS::Value *vp)
+{
+	JS::CallArgs args = CallArgsFromVp(argc, vp);
+	JS::RootedObject hobj(ctx, &args.thisv().toObject());
+
+	struct view_state *vs;
+	JSCompartment *comp = js::GetContextCompartment(ctx);
+
+	if (!comp) {
+		return false;
+	}
+
+	struct ecmascript_interpreter *interpreter = JS_GetCompartmentPrivate(comp);
+
+	/* This can be called if @obj if not itself an instance of the
+	 * appropriate class but has one in its prototype chain.  Fail
+	 * such calls.  */
+	if (!JS_InstanceOf(ctx, hobj, &screen_class, NULL))
+		return false;
+
+	vs = interpreter->vs;
+	if (!vs) {
+		return false;
+	}
+
+	struct document_view *doc_view = vs->doc_view;
+
+	if (!doc_view) {
+		return false;
+	}
+
+	args.rval().setInt32(doc_view->box.height * 16);
+
+	return true;
+}

src/ecmascript/spidermonkey/screen.h

@@ -0,0 +1,10 @@
+
+#ifndef EL__ECMASCRIPT_SPIDERMONKEY_SCREEN_H
+#define EL__ECMASCRIPT_SPIDERMONKEY_SCREEN_H
+
+#include "ecmascript/spidermonkey/util.h"
+
+extern JSClass screen_class;
+extern JSPropertySpec screen_props[];
+
+#endif

test/ecmascript/availHeight.html

@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html>
+<body>
+
+<p>Click the button to display the avail height of your screen, in pixels.</p>
+
+<button onclick="myFunction()">Try it</button>
+
+<p id="demo"></p>
+
+<script>
+function myFunction() {
+  var x = "Avail Height: " + screen.availHeight + "px";
+  alert(x);
+}
+</script>
+
+</body>
+</html>