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statistics: implement a statistics widget on desktop

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Implement a widget that shows the statistics state as comboboxes
and the statistics chart. Calls into the statistics code if any
of the comboboxes changes.

The hardest part here is the formatting of the charts list with
its icons and with headings. Sadly, it is not trivial to arrange
icons horizontally. Therefore we would have to fully reimplement
the ComboBox view, which is probably not fun.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2020-10-28 14:36:09 +01:00 • committed by Dirk Hohndel
parent 319a7af31a
commit 165dce4a0e
3 changed files with 377 additions and 0 deletions
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desktop-widgets/statswidget.cpp Normal file
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// SPDX-License-Identifier: GPL-2.0
#include "statswidget.h"
#include "mainwindow.h"
#include "stats/statsview.h"
#include <QCheckBox>
#include <QPainter>
#include <QStyledItemDelegate>
class ChartItemDelegate : public QStyledItemDelegate {
private:
void paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const override;
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override;
};
// Number of pixels that non-toplevel items are indented
static int indent(const QFontMetrics &fm)
{
#if QT_VERSION < QT_VERSION_CHECK(5, 11, 0)
return 4 * fm.width('-');
#else
return 4 * fm.horizontalAdvance('-');
#endif
}
static const int iconSpace = 2; // Number of pixels between icon and text
static const int topSpace = 2; // Number of pixels above icon
void ChartItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QFont font = index.data(Qt::FontRole).value<QFont>();
QFontMetrics fm(font);
QString name = index.data(ChartListModel::ChartNameRole).value<QString>();
painter->setFont(font);
QRect rect = option.rect;
if (option.state & QStyle::State_Selected) {
painter->save();
painter->setBrush(option.palette.highlight());
painter->setPen(Qt::NoPen);
painter->drawRect(rect);
painter->restore();
}
bool isHeader = index.data(ChartListModel::IsHeaderRole).value<bool>();
if (!isHeader)
rect.translate(indent(fm), 0);
QPixmap icon = index.data(ChartListModel::IconRole).value<QPixmap>();
if (!icon.isNull()) {
rect.translate(0, topSpace);
painter->drawPixmap(rect.topLeft(), icon);
rect.translate(icon.size().width() + iconSpace, (icon.size().height() - fm.height()) / 2);
}
painter->drawText(rect, name);
}
QSize ChartItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
QFont font = index.data(Qt::FontRole).value<QFont>();
QFontMetrics fm(font);
QString name = index.data(ChartListModel::ChartNameRole).value<QString>();
QSize iconSize = index.data(ChartListModel::IconSizeRole).value<QSize>();
QSize size = fm.size(Qt::TextSingleLine, name);
bool isHeader = index.data(ChartListModel::IsHeaderRole).value<bool>();
if (!isHeader)
size += QSize(indent(fm), 0);
if (iconSize.isValid())
size = QSize(size.width() + iconSize.width() + iconSpace,
std::max(size.height(), iconSize.height()) + 2 * topSpace);
return size;
}
StatsWidget::StatsWidget(QWidget *parent) : QWidget(parent)
{
ui.setupUi(this);
connect(ui.close, &QToolButton::clicked, this, &StatsWidget::closeStats);
ui.chartType->setModel(&charts);
connect(ui.chartType, QOverload<int>::of(&QComboBox::activated), this, &StatsWidget::chartTypeChanged);
connect(ui.var1, QOverload<int>::of(&QComboBox::activated), this, &StatsWidget::var1Changed);
connect(ui.var2, QOverload<int>::of(&QComboBox::activated), this, &StatsWidget::var2Changed);
connect(ui.var1Binner, QOverload<int>::of(&QComboBox::activated), this, &StatsWidget::var1BinnerChanged);
connect(ui.var2Binner, QOverload<int>::of(&QComboBox::activated), this, &StatsWidget::var2BinnerChanged);
connect(ui.var2Operation, QOverload<int>::of(&QComboBox::activated), this, &StatsWidget::var2OperationChanged);
}
// Initialize QComboBox with list of variables
static void setVariableList(QComboBox *combo, const StatsState::VariableList &list)
{
combo->clear();
for (const StatsState::Variable &v: list.variables)
combo->addItem(v.name, QVariant(v.id));
combo->setCurrentIndex(list.selected);
}
// Initialize QComboBox and QLabel of binners. Hide if there are no binners.
static void setBinList(QLabel *label, QComboBox *combo, const QString &varName, const StatsState::BinnerList &list)
{
combo->clear();
if (list.binners.empty()) {
label->hide();
combo->hide();
return;
}
label->show();
combo->show();
for (const QString &s: list.binners)
combo->addItem(s);
combo->setCurrentIndex(list.selected);
}
// Initialize QComboBox and QLabel of operations. Hide if there are no operations.
static void setOperationList(QLabel *label, QComboBox *combo, const QString &varName, const StatsState::VariableList &list)
{
combo->clear();
if (list.variables.empty()) {
label->hide();
combo->hide();
return;
}
label->show();
combo->show();
setVariableList(combo, list);
}
void StatsWidget::updateUi()
{
StatsState::UIState uiState = state.getUIState();
setVariableList(ui.var1, uiState.var1);
setVariableList(ui.var2, uiState.var2);
int pos = charts.update(uiState.charts);
ui.chartType->setCurrentIndex(pos);
ui.chartType->setItemDelegate(new ChartItemDelegate);
setBinList(ui.var1BinnerLabel, ui.var1Binner, uiState.var1Name, uiState.binners1);
setBinList(ui.var2BinnerLabel, ui.var2Binner, uiState.var2Name, uiState.binners2);
setOperationList(ui.var2OperationLabel, ui.var2Operation, uiState.var2Name, uiState.operations2);
// Add checkboxes for additional features
features.clear();
for (const StatsState::Feature &f: uiState.features) {
features.emplace_back(new QCheckBox(f.name));
QCheckBox *check = features.back().get();
check->setChecked(f.selected);
int id = f.id;
connect(check, &QCheckBox::stateChanged, [this,id] (int state) { featureChanged(id, state); });
ui.features->addWidget(check);
}
ui.stats->plot(state);
}
void StatsWidget::closeStats()
{
MainWindow::instance()->setApplicationState(ApplicationState::Default);
}
void StatsWidget::chartTypeChanged(int idx)
{
state.chartChanged(ui.chartType->itemData(idx).toInt());
updateUi();
}
void StatsWidget::var1Changed(int idx)
{
state.var1Changed(ui.var1->itemData(idx).toInt());
updateUi();
}
void StatsWidget::var2Changed(int idx)
{
state.var2Changed(ui.var2->itemData(idx).toInt());
updateUi();
}
void StatsWidget::var1BinnerChanged(int idx)
{
state.binner1Changed(idx);
updateUi();
}
void StatsWidget::var2BinnerChanged(int idx)
{
state.binner2Changed(idx);
updateUi();
}
void StatsWidget::var2OperationChanged(int idx)
{
state.var2OperationChanged(ui.var2Operation->itemData(idx).toInt());
updateUi();
}
void StatsWidget::featureChanged(int idx, bool status)
{
state.featureChanged(idx, status);
updateUi();
}
void StatsWidget::showEvent(QShowEvent *e)
{
updateUi();
QWidget::showEvent(e);
}