mirror-chatterino2/src/widgets/AttachedWindow.cpp

#include "AttachedWindow.hpp"

#include "Application.hpp"
#include "util/DebugCount.hpp"
#include "widgets/splits/Split.hpp"

#include <QTimer>
#include <QVBoxLayout>

#ifdef USEWINSDK
#include "util/WindowsHelper.hpp"

#include "Windows.h"
// don't even think about reordering these
#include "Psapi.h"
#pragma comment(lib, "Dwmapi.lib")
#endif

namespace chatterino {

AttachedWindow::AttachedWindow(void *_target, int _yOffset)
    : QWidget(nullptr, Qt::FramelessWindowHint | Qt::Window)
    , target_(_target)
    , yOffset_(_yOffset)
{
    QLayout *layout = new QVBoxLayout(this);
    layout->setMargin(0);
    this->setLayout(layout);

    auto *split = new Split(this);
    this->ui_.split = split;
    split->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::MinimumExpanding);
    layout->addWidget(split);

    util::DebugCount::increase("attached window");
}

AttachedWindow::~AttachedWindow()
{
    for (auto it = items.begin(); it != items.end(); it++) {
        if (it->window == this) {
            items.erase(it);
            break;
        }
    }

    util::DebugCount::decrease("attached window");
}

AttachedWindow *AttachedWindow::get(void *target, const GetArgs &args)
{
    AttachedWindow *window = [&]() {
        for (Item &item : items) {
            if (item.hwnd == target) {
                return item.window;
            }
        }

        auto *window = new AttachedWindow(target, args.yOffset);
        items.push_back(Item{target, window, args.winId});
        return window;
    }();

    bool show = true;
    QSize size = window->size();

    if (args.height != -1) {
        if (args.height == 0) {
            window->hide();
            show = false;
        } else {
            window->height_ = args.height;
            size.setHeight(args.height);
        }
    }
    if (args.width != -1) {
        if (args.width == 0) {
            window->hide();
            show = false;
        } else {
            window->width_ = args.width;
            size.setWidth(args.width);
        }
    }

    if (show) {
        window->updateWindowRect_(window->target_);
        window->show();
    }

    return window;
}

void AttachedWindow::detach(const QString &winId)
{
    for (Item &item : items) {
        if (item.winId == winId) {
            item.window->deleteLater();
        }
    }
}

void AttachedWindow::setChannel(ChannelPtr channel)
{
    this->ui_.split->setChannel(channel);
}

void AttachedWindow::showEvent(QShowEvent *)
{
    this->attachToHwnd_(this->target_);
}

void AttachedWindow::attachToHwnd_(void *_attachedPtr)
{
#ifdef USEWINSDK
    if (this->attached_) {
        return;
    }

    this->attached_ = true;
    this->timer_.setInterval(1);

    auto hwnd = HWND(this->winId());
    auto attached = HWND(_attachedPtr);

    QObject::connect(&this->timer_, &QTimer::timeout, [this, hwnd, attached] {
        // check process id
        if (!this->validProcessName_) {
            DWORD processId;
            ::GetWindowThreadProcessId(attached, &processId);

            HANDLE process =
                ::OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, false, processId);

            std::unique_ptr<TCHAR[]> filename(new TCHAR[512]);
            DWORD filenameLength = ::GetModuleFileNameEx(process, nullptr, filename.get(), 512);
            QString qfilename = QString::fromWCharArray(filename.get(), filenameLength);

            if (!qfilename.endsWith("chrome.exe") && !qfilename.endsWith("firefox.exe")) {
                qDebug() << "NM Illegal caller" << qfilename;
                this->timer_.stop();
                this->deleteLater();
                return;
            }
            this->validProcessName_ = true;
        }

        this->updateWindowRect_(attached);
    });
    this->timer_.start();
#endif
}

void AttachedWindow::updateWindowRect_(void *_attachedPtr)
{
#ifdef USEWINSDK
    auto hwnd = HWND(this->winId());
    auto attached = HWND(_attachedPtr);

    // We get the window rect first so we can close this window when it returns an error.
    // If we query the process first and check the filename then it will return and empty string
    // that doens't match.
    ::SetLastError(0);
    RECT rect;
    ::GetWindowRect(attached, &rect);

    if (::GetLastError() != 0) {
        qDebug() << "NM GetLastError()" << ::GetLastError();

        this->timer_.stop();
        this->deleteLater();
        return;
    }

    // set the correct z-order
    HWND next = ::GetNextWindow(attached, GW_HWNDPREV);

    ::SetWindowPos(hwnd, next ? next : HWND_TOPMOST, 0, 0, 0, 0,
                   SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);

    float scale = 1.f;
    if (auto dpi = util::getWindowDpi(attached)) {
        scale = dpi.get() / 96.f;

        //        for (auto w : this->ui_.split->findChildren<BaseWidget *>()) {
        //            w->setOverrideScale(scale);
        //        }
        //        this->ui_.split->setOverrideScale(scale);
    }

    if (this->height_ == -1) {
        // ::MoveWindow(hwnd, rect.right - this->width_ - 8, rect.top + this->yOffset_ - 8,
        //              this->width_, rect.bottom - rect.top - this->yOffset_, false);
    } else {
        ::MoveWindow(hwnd,                                          //
                     int(rect.right - this->width_ * scale - 8),    //
                     int(rect.bottom - this->height_ * scale - 8),  //
                     int(this->width_ * scale), int(this->height_ * scale), true);
    }

//        ::MoveWindow(hwnd, rect.right - 360, rect.top + 82, 360 - 8, rect.bottom -
//        rect.top - 82 - 8, false);
#endif
}

// void AttachedWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
//{
//    MSG *msg = reinterpret_cast

//    case WM_NCCALCSIZE: {
//    }
//}

std::vector<AttachedWindow::Item> AttachedWindow::items;

}  // namespace chatterino