add QAD::VirtualKeyboard library, vkbd for widgets with JSON-based description

libs/virtual_keyboard/virtual_keyboard_layout.cpp

@@ -0,0 +1,72 @@
+#include "virtual_keyboard_layout.h"
+
+#include <QJsonArray>
+#include <QJsonObject>
+
+
+VirtualKeyboardLayout::VirtualKeyboardLayout(QJsonObject root) {
+	default_page = root["default_page"].toString();
+	auto pa      = root["pages"].toArray();
+	for (auto p: pa) {
+		auto page = new VirtualKeyboardLayoutPage(p.toObject());
+		if (page->isValid()) {
+			connect(page, &VirtualKeyboardLayoutPage::gotoPageRequest, this, &VirtualKeyboardLayout::gotoPageRequest);
+			connect(page, &VirtualKeyboardLayoutPage::hideRequest, this, &VirtualKeyboardLayout::hideRequest);
+			pages << page;
+		} else
+			delete page;
+	}
+}
+
+
+VirtualKeyboardLayout::~VirtualKeyboardLayout() {
+	// piDeleteAllAndClear(pages);
+}
+
+
+VirtualKeyboardLayoutPage * VirtualKeyboardLayout::getPageByName(QString name) const {
+	for (auto p: pages)
+		if (p->name() == name) return p;
+	return nullptr;
+}
+
+
+void VirtualKeyboardLayout::setDefaultPage() {
+	emit gotoPageRequest(default_page);
+}
+
+
+void VirtualKeyboardLayout::setCurrentPage(VirtualKeyboardLayoutPage * p) {
+	current_page = p;
+}
+
+
+void VirtualKeyboardLayout::applyHints(Qt::InputMethodHints hints) {
+	// qDebug() << hints << current_page;
+	if (hints.testFlag(Qt::ImhPreferNumbers) || hints.testFlag(Qt::ImhDigitsOnly)) gotoPageRequest("numeric");
+	if (hints.testFlag(Qt::ImhPreferLatin) || hints.testFlag(Qt::ImhLatinOnly)) gotoPageRequest("latin");
+	if (hints.testFlag(Qt::ImhPreferLowercase) || hints.testFlag(Qt::ImhLowercaseOnly) || hints.testFlag(Qt::ImhNoAutoUppercase))
+		setCapital(false);
+	else
+		setCapital(true);
+	setGotoEnabled(!hints.testFlag(Qt::ImhDigitsOnly) && !hints.testFlag(Qt::ImhLatinOnly));
+	setCapitalEnabled(!hints.testFlag(Qt::ImhUppercaseOnly) && !hints.testFlag(Qt::ImhLowercaseOnly));
+}
+
+
+void VirtualKeyboardLayout::setGotoEnabled(bool yes) {
+	for (auto p: pages)
+		p->setGotoEnabled(yes);
+}
+
+
+void VirtualKeyboardLayout::setCapitalEnabled(bool yes) {
+	for (auto p: pages)
+		p->setCapitalEnabled(yes);
+}
+
+
+void VirtualKeyboardLayout::setCapital(bool yes) {
+	for (auto p: pages)
+		p->setCapital(yes);
+}