Transitioning to using ListView to show images.

The old widgets are not yet removed. A LOT of old sh*t needs rewriting
for removing them.

(Note to self) Other TODOs:
 - Convert all keyevents to qactions.
 - Convert main window to an actual main window.
 - Move file loading logic out of main.cpp (or not, doesn't even matter).
 - Move subsliced signatures into library.

5 files changed, 223 insertions, 0 deletions

diff --git a/mingui/CMakeLists.txt b/mingui/CMakeLists.txt
index 3a53455..3503f98 100644
--- a/mingui/CMakeLists.txt
+++ b/mingui/CMakeLists.txt
@@ -17,6 +17,7 @@ set(CMAKE_AUTOUIC ON)
 add_executable(mingui
     main.cpp
     mingui.cpp
+    imageitem.cpp
 )
 
 target_link_libraries(mingui
diff --git a/mingui/imageitem.cpp b/mingui/imageitem.cpp
new file mode 100644
index 0000000..ec7dc94
--- /dev/null
+++ b/mingui/imageitem.cpp
@@ -0,0 +1,129 @@
+#include "imageitem.hpp"
+
+#include <algorithm>
+
+#include <QDebug>
+#include <QFileInfo>
+#include <QPixmap>
+#include <QListView>
+#include <QScrollBar>
+#include <QFontMetrics>
+#include <QPainter>
+#include <QLocale>
+
+ImageItem::ImageItem(QString fn, QString dispn, QKeySequence hotkey, double pxratio)
+{
+    this->setText(dispn);
+    this->setData(fn, ImageItemRoles::path_role);
+    this->setData(QFileInfo(fn).size(), ImageItemRoles::file_size_role);
+    this->setCheckable(true);
+    QPixmap pm(fn);
+    pm.setDevicePixelRatio(pxratio);
+    this->setData(pm.size(), ImageItemRoles::dimension_role);
+    this->setData(hotkey, ImageItemRoles::hotkey_role);
+    this->setData(pm, Qt::ItemDataRole::DecorationRole);
+}
+
+void ImageItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    QRect imr = option.rect;
+    imr.adjust(MARGIN + BORDER, MARGIN + BORDER, -MARGIN - BORDER, -MARGIN - BORDER);
+    QFont bfnt(option.font);
+    bfnt.setBold(true);
+    QFontMetrics bfm(bfnt);
+    imr.adjust(0, 0, 0, -2 * HKPADD - bfm.height() - LINESP);
+
+    QRect selr = option.rect.adjusted(MARGIN, MARGIN, -MARGIN, -MARGIN);
+    QStyleOptionViewItem so(option);
+    so.rect = selr;
+    if (index.data(Qt::ItemDataRole::CheckStateRole).value<Qt::CheckState>() == Qt::CheckState::Checked)
+        so.state |= QStyle::StateFlag::State_Selected;
+    so.state |= QStyle::StateFlag::State_Active;
+    option.widget->style()->drawPrimitive(QStyle::PrimitiveElement::PE_PanelItemViewItem, &so, painter, option.widget);
+
+
+    QPixmap pm = index.data(Qt::ItemDataRole::DecorationRole).value<QPixmap>();
+    QSize imd = pm.size().scaled(imr.size(), Qt::AspectRatioMode::KeepAspectRatio);
+    painter->setRenderHint(QPainter::RenderHint::SmoothPixmapTransform);
+    painter->drawPixmap(QRect(imr.topLeft(), imd), pm);
+    QPoint dtopright = QRect(imr.topLeft(),imd).bottomLeft();
+
+    QPoint hko = dtopright + QPoint(HKPADD, HKPADD + LINESP);
+    QKeySequence ks = index.data(ImageItem::ImageItemRoles::hotkey_role).value<QKeySequence>();
+    QString kss = ks.toString();
+    QRect r = bfm.boundingRect(kss);
+    r.moveTopLeft(hko);
+    QRect hkbg = r.adjusted(-HKPADD, -HKPADD, HKPADD, HKPADD);
+    if (hkbg.width() < hkbg.height())
+    {
+        int shift = (hkbg.height() - hkbg.width()) / 2;
+        r.adjust(shift, 0, shift, 0);
+        hkbg.setWidth(hkbg.height());
+    }
+    painter->setPen(QPen(QBrush(), 0));
+    painter->setBrush(option.widget->palette().color(QPalette::ColorGroup::Normal, QPalette::ColorRole::Light));
+    painter->drawRoundedRect(hkbg.adjusted(HKSHDS, HKSHDS, HKSHDS, HKSHDS), 4, 4);
+    painter->setBrush(option.widget->palette().color(QPalette::ColorGroup::Normal, QPalette::ColorRole::WindowText));
+    painter->drawRoundedRect(hkbg, 4, 4);
+    painter->setPen(option.widget->palette().color(QPalette::ColorGroup::Normal, QPalette::ColorRole::Window));
+    painter->setBrush(QBrush());
+    painter->setFont(bfnt);
+    painter->drawText(r, kss);
+
+    QPoint ftopright = hkbg.topRight() + QPoint(LINESP + HKSHDS, 0);
+    QSize dim = index.data(ImageItem::ImageItemRoles::dimension_role).value<QSize>();
+    qint64 fsz = index.data(ImageItem::ImageItemRoles::file_size_role).value<qint64>();
+    QString infos = QString("%1 x %2, %3")
+                    .arg(dim.width()).arg(dim.height())
+                    .arg(QLocale::system().formattedDataSize(fsz, 3));
+    QString fns = index.data(Qt::ItemDataRole::DisplayRole).toString();
+    r = option.fontMetrics.boundingRect(infos);
+    r.moveTopLeft(ftopright + QPoint(0, (hkbg.height() - r.height()) / 2));
+    painter->setFont(option.font);
+    painter->setPen(option.widget->palette().color(QPalette::ColorGroup::Normal, QPalette::ColorRole::Text));
+    painter->drawText(r, infos);
+    r = option.fontMetrics.boundingRect(fns);
+    r.moveTopRight(QPoint(option.rect.right() - MARGIN - BORDER, ftopright.y() + (hkbg.height() - r.height()) / 2));
+    painter->drawText(r, fns);
+    /*
+    painter->setPen(QColor(Qt::GlobalColor::red));
+    painter->drawRect(QRect(imr.topLeft(), imd));
+    painter->drawRect(txt);
+    painter->setPen(option.widget->palette().color(QPalette::ColorRole::Text));
+    */
+}
+
+QSize ImageItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    const QListView *lw = qobject_cast<const QListView*>(option.widget);
+    QSize vpsz = lw->maximumViewportSize();
+    QScrollBar *vsc = lw->verticalScrollBar();
+    if (vsc->isVisible())
+        vpsz.setWidth(vpsz.width() - vsc->size().width());
+    QScrollBar *hsc = lw->horizontalScrollBar();
+    if (hsc->isVisible())
+        vpsz.setHeight(vpsz.height() - vsc->size().height());
+    QPixmap pm = index.data(Qt::ItemDataRole::DecorationRole).value<QPixmap>();
+    QSize onscsz = pm.size() / pm.devicePixelRatioF();
+    int imh = onscsz.height();
+    if (onscsz.width() > vpsz.width() - 2 * MARGIN - 2 * BORDER)
+        imh = (vpsz.width() - 2 * MARGIN - 2 * BORDER) / (double)onscsz.width() * onscsz.height();
+
+    QFont fnt(option.font);
+    fnt.setBold(true);
+    QFontMetrics fm(fnt);
+    int extra_height = 2 * MARGIN + 2 * BORDER + LINESP + fm.height() + 2 * HKPADD + HKSHDS;
+    int min_height = 64;
+    int max_height = imh;
+
+    QSize ret(vpsz);
+    ret.setHeight(vpsz.height() / index.model()->rowCount() - lw->spacing());
+    ret.setHeight(std::max(min_height + extra_height, ret.height()));
+    ret.setHeight(std::min(max_height + extra_height, ret.height()));
+    return ret;
+}
+
+void ImageItemDelegate::resize(const QModelIndex &index)
+{
+    Q_EMIT sizeHintChanged(index);
+}
diff --git a/mingui/imageitem.hpp b/mingui/imageitem.hpp
new file mode 100644
index 0000000..8c9397e
--- /dev/null
+++ b/mingui/imageitem.hpp
@@ -0,0 +1,39 @@
+#ifndef IMAGEITEM_HPP
+#define IMAGEITEM_HPP
+
+#include <QStandardItem>
+#include <QAbstractItemDelegate>
+#include <QStyleOptionViewItem>
+#include <QModelIndex>
+
+class ImageItem : public QStandardItem
+{
+public:
+    enum ImageItemRoles
+    {
+        path_role = Qt::ItemDataRole::UserRole + 0x1000,
+        dimension_role,
+        file_size_role,
+        hotkey_role
+    };
+    ImageItem(QString fn, QString dispn, QKeySequence hotkey, double pxratio = 1.0);
+};
+
+class ImageItemDelegate : public QAbstractItemDelegate
+{
+    Q_OBJECT
+private:
+    const static int MARGIN = 3;
+    const static int BORDER = 3;
+    const static int HKPADD = 4;
+    const static int LINESP = 4;
+    const static int HKSHDS = 2;
+public:
+    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
+    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
+    void resize(const QModelIndex &index);
+Q_SIGNALS:
+    void sizeHintChanged(const QModelIndex &index);
+};
+
+#endif
diff --git a/mingui/mingui.cpp b/mingui/mingui.cpp
index ab1a083..94f7e81 100644
--- a/mingui/mingui.cpp
+++ b/mingui/mingui.cpp
@@ -1,4 +1,5 @@
 #include "mingui.hpp"
+#include "imageitem.hpp"
 
 #include <cstdio>
 #include <cwchar>
@@ -8,6 +9,8 @@
 #include <QKeyEvent>
 #include <QString>
 #include <QScrollArea>
+#include <QListView>
+#include <QStandardItemModel>
 #include <QLabel>
 #include <QHBoxLayout>
 #include <QVBoxLayout>
@@ -59,9 +62,39 @@ MinGuiWidget::MinGuiWidget()
     infopanel = new QTextEdit(this);
     infopanel->setReadOnly(true);
     imgcontainer = new QWidget(this);
+    lw = new QListView(this);
+    im = new QStandardItemModel(this);
+    lw->setModel(im);
+    id = new ImageItemDelegate();
+    lw->setItemDelegate(id);
+    lw->setSelectionMode(QAbstractItemView::SelectionMode::NoSelection);
+    lw->setResizeMode(QListView::ResizeMode::Adjust);
+    QObject::connect(lw, &QListView::clicked, [this](const QModelIndex &i) {
+        auto cs = i.data(Qt::ItemDataRole::CheckStateRole).value<Qt::CheckState>();
+        if (cs == Qt::CheckState::Checked)
+            cs = Qt::CheckState::Unchecked;
+        else cs = Qt::CheckState::Checked;
+        this->im->setData(i, cs, Qt::ItemDataRole::CheckStateRole);
+    });
+    QObject::connect(lw, &QListView::doubleClicked, [this](const QModelIndex &i) {
+        auto cs = i.data(Qt::ItemDataRole::CheckStateRole).value<Qt::CheckState>();
+        if (cs == Qt::CheckState::Checked)
+            cs = Qt::CheckState::Unchecked;
+        else cs = Qt::CheckState::Checked;
+        this->im->setData(i, cs, Qt::ItemDataRole::CheckStateRole);
+        QDesktopServices::openUrl(QUrl::fromLocalFile(i.data(ImageItem::ImageItemRoles::path_role).toString()));
+    });
+    QObject::connect(im, &QStandardItemModel::itemChanged, [this](QStandardItem *i) {
+        ImageItem *itm = static_cast<ImageItem*>(i);
+        QModelIndex idx = itm->index();
+        bool checked = itm->data(Qt::ItemDataRole::CheckStateRole) == Qt::CheckState::Checked;
+        if (checked != marks[idx.row()])
+            this->mark_toggle(idx.row());
+    });
     sa = new QScrollArea(this);
     sa->setFrameStyle(QFrame::Shape::NoFrame);
     l->addWidget(sa);
+    l->addWidget(lw);
     l->addWidget(infopanel);
     marked.clear();
     infopanel->setText("bleh");
@@ -74,6 +107,7 @@ void MinGuiWidget::show_images(const std::vector<fs::path> &fns)
     current_set = fns;
     marks.clear();
     imgw.clear();
+    im->clear();
     qDeleteAll(imgcontainer->children());
     sa->takeWidget();
     imgcontainer->setLayout(new QVBoxLayout(imgcontainer));
@@ -94,6 +128,7 @@ void MinGuiWidget::show_images(const std::vector<fs::path> &fns)
     {
         marks.push_back(marked.find(f) != marked.end());
         ImageWidget *tw = new ImageWidget(f, f.native().substr(common_pfx.length()), idx, max_width, max_height, this);
+        im->appendRow(new ImageItem(fsstr_to_qstring(f.native()), fsstr_to_qstring(f.native().substr(common_pfx.length())), keys[idx], lw->devicePixelRatioF()));
         QObject::connect(tw, &ImageWidget::clicked, [this, idx] { this->mark_toggle(idx); });
         imgw.push_back(tw);
         imgcontainer->layout()->addWidget(tw);
@@ -230,10 +265,14 @@ void MinGuiWidget::mark_view_update(bool update_msg)
         if (marks[i])
         {
             p.setColor(QPalette::ColorRole::Window, Qt::GlobalColor::red);
+            im->item(i)->setCheckState(Qt::CheckState::Checked);
             ++m;
         }
         else
+        {
             p.setColor(QPalette::ColorRole::Window, this->palette().color(QPalette::ColorRole::Window));
+            im->item(i)->setCheckState(Qt::CheckState::Unchecked);
+        }
         imgw[i]->setBackgroundRole(QPalette::ColorRole::Window);
         imgw[i]->setAutoFillBackground(true);
         imgw[i]->setPalette(p);
@@ -301,6 +340,14 @@ void MinGuiWidget::keyReleaseEvent(QKeyEvent *e)
     }
 }
 
+void MinGuiWidget::resizeEvent(QResizeEvent *e)
+{
+    QWidget::resizeEvent(e);
+    if (!id || !im) return;
+    for (int i = 0; i < im->rowCount(); ++i)
+        id->resize(im->indexFromItem(im->item(i)));
+}
+
 void MinGuiWidget::closeEvent(QCloseEvent *e)
 {
     if (QMessageBox::StandardButton::Yes ==
diff --git a/mingui/mingui.hpp b/mingui/mingui.hpp
index 755b6ad..aa71596 100644
--- a/mingui/mingui.hpp
+++ b/mingui/mingui.hpp
@@ -13,6 +13,9 @@ class QLabel;
 class QStatusBar;
 class QScrollArea;
 class QTextEdit;
+class QListView;
+class QStandardItemModel;
+class ImageItemDelegate;
 
 namespace fs = std::filesystem;
 
@@ -26,6 +29,9 @@ private:
     QWidget *imgcontainer;
     QStatusBar *sb;
     QScrollArea *sa;
+    QListView *lw;
+    QStandardItemModel *im = nullptr;
+    ImageItemDelegate *id = nullptr;
     std::size_t ngroups, curgroup;
     bool nohotkeywarn;
     void mark_toggle(std::size_t x);
@@ -41,6 +47,7 @@ private:
 protected:
     void keyPressEvent(QKeyEvent *e) override;
     void keyReleaseEvent(QKeyEvent *e) override;
+    void resizeEvent(QResizeEvent *e) override;
     void closeEvent(QCloseEvent *e) override;
 public:
     MinGuiWidget();