nim/Client/src/widgets/ImagePreviewDialog.cpp

#include "ImagePreviewDialog.h"
#include "TitleBar.h"
#include "UiHelpers.h"

#include <QFile>
#include <QFileDialog>
#include <QFrame>
#include <QIODevice>
#include <QHBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QScrollArea>
#include <QVBoxLayout>

ImagePreviewDialog::ImagePreviewDialog(const QPixmap &image, const QString &name,
                                       const QByteArray &bytes, QWidget *parent, bool canForward,
                                       bool canFavorite)
    : QDialog(parent)
{
    setObjectName(QStringLiteral("ChromeWindow"));
    setWindowTitle(name.isEmpty() ? QStringLiteral("图片") : name);
    UiHelpers::setupFramelessDialog(this);

    const qreal dpr = image.devicePixelRatio() > 0 ? image.devicePixelRatio() : 1.0;
    const int iw = qMax(1, qRound(image.width() / dpr));
    const int ih = qMax(1, qRound(image.height() / dpr));
    const int maxW = 560;
    const int maxH = 480;
    QSize shown(iw, ih);
    shown.scale(maxW, maxH, Qt::KeepAspectRatio);
    const int winW = qBound(320, shown.width() + 24, 600);
    const int winH = qBound(280, shown.height() + 108, 620);
    setFixedSize(winW, winH);

    auto *root = new QVBoxLayout(this);
    root->setContentsMargins(0, 0, 0, 0);
    root->setSpacing(0);

    auto *bar = new TitleBar(this);
    bar->setTitle(name.isEmpty() ? QStringLiteral("图片") : name);
    bar->setTheme(TitleBar::Light);
    bar->setMaximizable(false);
    bar->bind(this, false);
    root->addWidget(bar);

    auto *area = new QScrollArea(this);
    area->setWidgetResizable(true);
    area->setFrameShape(QFrame::NoFrame);
    area->setStyleSheet(QStringLiteral("background:#1A1A1A; border:none;"));
    auto *img = new QLabel(area);
    img->setAlignment(Qt::AlignCenter);
    img->setStyleSheet(QStringLiteral("background:transparent;"));
    const QPixmap fit = image.scaled(qRound(shown.width() * dpr), qRound(shown.height() * dpr),
                                     Qt::KeepAspectRatio, Qt::SmoothTransformation);
    QPixmap display = fit;
    display.setDevicePixelRatio(dpr);
    img->setPixmap(display);
    area->setWidget(img);
    root->addWidget(area, 1);

    auto *btns = new QWidget(this);
    btns->setFixedHeight(48);
    btns->setStyleSheet(QStringLiteral("background:#FFFFFF; border-top:1px solid #E5E5E5;"));
    auto *bLay = new QHBoxLayout(btns);
    bLay->setContentsMargins(16, 8, 16, 8);
    auto *save = UiHelpers::ghostButton(QStringLiteral("保存"), btns);
    save->setFixedSize(88, 32);
    auto *fwd = UiHelpers::ghostButton(QStringLiteral("转发"), btns);
    fwd->setFixedSize(88, 32);
    fwd->setVisible(canForward);
    auto *fav = UiHelpers::ghostButton(QStringLiteral("收藏"), btns);
    fav->setFixedSize(88, 32);
    fav->setVisible(canFavorite);
    auto *ok = UiHelpers::primaryButton(QStringLiteral("关闭"), btns);
    ok->setFixedSize(88, 32);
    bLay->addWidget(save);
    if (canForward)
        bLay->addWidget(fwd);
    if (canFavorite)
        bLay->addWidget(fav);
    bLay->addStretch();
    bLay->addWidget(ok);
    root->addWidget(btns);

    connect(ok, &QPushButton::clicked, this, &QDialog::accept);
    connect(fwd, &QPushButton::clicked, this, [this]() {
        m_forward = true;
        accept();
    });
    connect(fav, &QPushButton::clicked, this, [this]() {
        m_favorite = true;
        accept();
    });
    connect(save, &QPushButton::clicked, this, [this, name, bytes]() {
        const QString path = QFileDialog::getSaveFileName(
            this, QStringLiteral("保存图片"), name.isEmpty() ? QStringLiteral("image.jpg") : name);
        if (path.isEmpty())
            return;
        QFile f(path);
        if (!f.open(QIODevice::WriteOnly) || f.write(bytes) != bytes.size())
        {
            UiHelpers::showToast(this, QStringLiteral("保存失败"), true);
            return;
        }
        UiHelpers::showToast(this, QStringLiteral("已保存"));
    });
}