Older/WebApplication/RedirectPage.cpp

#include "RedirectPage.h"
#include "BoostLog.h"
#include <Wt/WAnchor.h>
#include <Wt/WTimer.h>

constexpr auto Template = R"(
<p>${message}</p>
<div>您将在${seconds}秒后${go}${anchor}。</div>
)";

RedirectPage::RedirectPage() : Wt::WTemplate(Template), m_history(this, "history") {
    m_timer = addChild(std::make_unique<Wt::WTimer>());
    m_timer->setInterval(std::chrono::milliseconds(1000));
    m_timer->timeout().connect(this, &RedirectPage::onTimeout);
    m_timer->start();
    bindEmpty("message");
    bindEmpty("anchor");
    bindString("go", "返回");
    bindInt("seconds", m_time / 1000);

    m_history.connect(this, [this](int history) {
        LOG(info) << "history: " << history;
        m_historySize = history;
        m_anchor = bindWidget("anchor", std::make_unique<Wt::WAnchor>());
        if (m_redirect.empty()) {
            m_anchor->setText(history > 2 ? "上一页" : "首页");
            bindString("go", history > 2 ? "返回" : "前往");
            m_anchor->clicked().connect(this, [this]() { redirect(m_redirect); });
        } else {
            bindString("go", "前往");
            m_anchor->setText(m_text.empty() ? m_redirect : m_text);
            m_anchor->setLink(Wt::WLink(Wt::LinkType::Url, m_redirect));
        }
    });
    doJavaScript(std::format("{}.emit({},'{}',window.history.length)", Wt::WApplication::instance()->javaScriptClass(), id(),
                             m_history.name()));
}

void RedirectPage::setRedirect(const std::string &path, const std::string &text) {
    if (m_redirect != path) {
        m_redirect = path;
    }
    if (m_text != text) {
        m_text = text;
    }
    if (m_anchor != nullptr) {
        m_anchor->setText(text.empty() ? path : text);
        m_anchor->setLink(Wt::WLink(Wt::LinkType::Url, path));
    }
}

void RedirectPage::setMessage(const std::string &message) {
    bindString("message", message);
}

void RedirectPage::redirect(const std::string &path) {
    if (m_timer->isActive()) {
        m_timer->stop();
    }
    auto app = Wt::WApplication::instance();
    if (path.empty()) {
        if (m_historySize > 2) {
            doJavaScript("window.history.go(-1)");
        } else {
            app->redirect("/");
        }
    } else {
        if (m_redirect.starts_with("/wt")) {
            app->setInternalPath(m_redirect, true);
        } else {
            app->redirect(m_redirect);
        }
    }
}

void RedirectPage::onTimeout() {
    m_time -= 1000;
    if (m_time <= 0) {
        redirect(m_redirect); // stop timer inside.
    } else {
        bindInt("seconds", m_time / 1000);
    }
}