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/*
* Copyright (c) 2018 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swift/QtUI/QtExpandedListView.h>
#include <QWheelEvent>
#include <QScrollArea>
#include <QDebug>
namespace Swift {
QtExpandedListView::QtExpandedListView(QWidget* parent) : QListView(parent) {
// Disable macOS focus rectangle due to bad performance.
setAttribute(Qt::WA_MacShowFocusRect, 0);
setSizePolicy(sizePolicy().horizontalPolicy(), QSizePolicy::Fixed);
}
void QtExpandedListView::setModel(QAbstractItemModel* newModel) {
if (model()) {
disconnectFromModel(model());
}
if (newModel) {
connectToModel(newModel);
}
QListView::setModel(newModel);
adjustHeightToModelChange();
}
QtExpandedListView::~QtExpandedListView() {
if (model()) {
disconnectFromModel(model());
}
}
bool QtExpandedListView::viewportEvent(QEvent* event) {
// Ignore wheel events for faster mouse scrolling.
if (event && event->type() == QEvent::Wheel) {
return false;
}
return QListView::viewportEvent(event);
}
template <typename T>
T getParentOfType(QWidget* start) {
auto parentW = start->parentWidget();
if (parentW == nullptr) {
return nullptr;
}
T result = dynamic_cast<T>(parentW);
if (result) {
return result;
}
return getParentOfType<T>(parentW);
}
void QtExpandedListView::currentChanged(const QModelIndex ¤t, const QModelIndex &) {
// Make sure that the current selected index is visible in the parent QScrollArea.
auto scrollArea = getParentOfType<QScrollArea*>(parentWidget());
if (scrollArea) {
auto scrollWidget = scrollArea->widget();
QList<QPoint> points;
auto visRect = visualRect(current);
points << mapTo(scrollWidget, visRect.topLeft());
points << mapTo(scrollWidget, visRect.topRight());
points << mapTo(scrollWidget, visRect.bottomLeft());
points << mapTo(scrollWidget, visRect.bottomRight());
for (auto&& point : points) {
scrollArea->ensureVisible(point.x(), point.y(), 0, 0);
}
}
}
void QtExpandedListView::adjustHeightToModelChange() {
updateGeometry();
}
QSize QtExpandedListView::minimumSizeHint() const {
auto sh = sizeHint();
return QSize(0, sh.height());
}
QSize QtExpandedListView::sizeHint() const {
auto listViewSH = QListView::sizeHint();
if (model()) {
auto lastRect = rectForIndex(model()->index(model()->rowCount()-1, 0, rootIndex()));
auto idealHeight = lastRect.y() + lastRect.height() + frameWidth() * 2;
listViewSH.setHeight(idealHeight);
}
return listViewSH;
}
void QtExpandedListView::connectToModel(QAbstractItemModel* model) {
connect(model, &QAbstractItemModel::dataChanged, this, &QtExpandedListView::adjustHeightToModelChange);
connect(model, &QAbstractItemModel::modelReset, this, &QtExpandedListView::adjustHeightToModelChange);
connect(model, &QAbstractItemModel::rowsInserted, this, &QtExpandedListView::adjustHeightToModelChange);
connect(model, &QAbstractItemModel::rowsRemoved, this, &QtExpandedListView::adjustHeightToModelChange);
}
void QtExpandedListView::disconnectFromModel(QAbstractItemModel* model) {
disconnect(model, &QAbstractItemModel::dataChanged, this, &QtExpandedListView::adjustHeightToModelChange);
disconnect(model, &QAbstractItemModel::modelReset, this, &QtExpandedListView::adjustHeightToModelChange);
disconnect(model, &QAbstractItemModel::rowsInserted, this, &QtExpandedListView::adjustHeightToModelChange);
disconnect(model, &QAbstractItemModel::rowsRemoved, this, &QtExpandedListView::adjustHeightToModelChange);
}
}
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Swift