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/*
* Copyright (c) 2014-2018 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swift/QtUI/Trellis/QtGridSelectionDialog.h>
#include <QApplication>
#include <QCursor>
#include <QPaintEvent>
#include <QPainter>
#include <QStyle>
#include <QStyleOption>
namespace Swift {
QtGridSelectionDialog::QtGridSelectionDialog(QWidget* parent) : QWidget(parent), descriptionText(tr("Select the number of rows and columns for your layout. You can change the size by moving the mouse or cursor keys.")) {
frameSize = QSize(28,28) * 2;
maxGridSize = QSize(7,7);
minGridSize = QSize(1,1);
currentGridSize = QSize(1,1);
padding = 4;
setWindowFlags(Qt::FramelessWindowHint);
setCursor(Qt::SizeAllCursor);
horizontalMargin = style()->pixelMetric(QStyle::PM_LayoutLeftMargin);
verticalMargin = style()->pixelMetric(QStyle::PM_LayoutBottomMargin);
}
QSize QtGridSelectionDialog::sizeHint() const {
// PM_MenuVMargin | frameSize | ( padding | frameSize ) * | PM_MenuVMargin
int width = horizontalMargin + frameSize.width() + (padding + frameSize.width()) * (currentGridSize.width() - 1) + horizontalMargin;
int height = verticalMargin + frameSize.height() + (padding + frameSize.height()) * (currentGridSize.height() - 1) + verticalMargin;
height += getDescriptionTextHeight(width);
return QSize(width, height);
}
void QtGridSelectionDialog::setCurrentGridSize(const QSize& size) {
currentGridSize = size;
emit currentGridSizeChanged(size);
}
QSize QtGridSelectionDialog::getCurrentGridSize() const {
return currentGridSize;
}
void QtGridSelectionDialog::setMinGridSize(const QSize& size) {
minGridSize = size;
emit minGridSizeChanged(size);
}
QSize QtGridSelectionDialog::getMinGridSize() const {
return minGridSize;
}
void QtGridSelectionDialog::setMaxGridSize(const QSize& size) {
maxGridSize = size;
emit maxGridSizeChanged(size);
}
QSize QtGridSelectionDialog::getMaxGridSize() const {
return maxGridSize;
}
QSize QtGridSelectionDialog::getFrameSize() const {
return frameSize;
}
int QtGridSelectionDialog::getDescriptionTextHeight() const {
auto width = horizontalMargin + frameSize.width() + (padding + frameSize.width()) * (currentGridSize.width() - 1) + horizontalMargin;
return getDescriptionTextHeight(width);
}
int QtGridSelectionDialog::getDescriptionTextHeight(int width) const {
// Height of descriptive centered text below trellis
auto fontMetrics = QFontMetrics(QApplication::font());
auto descriptionBB = fontMetrics.boundingRect(QRect(0, 0, width - 2 * horizontalMargin, 1000), Qt::TextWordWrap, descriptionText, 0, nullptr);
return (descriptionBB.height() + descriptionBB.y());
}
void QtGridSelectionDialog::keyReleaseEvent(QKeyEvent* event) {
if (event) {
QSize newGridSize = currentGridSize;
if (event->key() == Qt::Key_Up) {
newGridSize += QSize(0, -1);
}
else if (event->key() == Qt::Key_Down) {
newGridSize += QSize(0, 1);
}
else if (event->key() == Qt::Key_Left) {
newGridSize += QSize(-1, 0);
}
else if (event->key() == Qt::Key_Right) {
newGridSize += QSize(1, 0);
}
else if (event->key() == Qt::Key_Return) {
hide();
setCurrentGridSize(currentGridSize);
}
else if (event->key() == Qt::Key_Escape) {
hide();
}
if (minGridSize.expandedTo(newGridSize).boundedTo(maxGridSize) != currentGridSize) {
currentGridSize = minGridSize.expandedTo(newGridSize).boundedTo(maxGridSize);
QSize newSizeHint = sizeHint();
resize(newSizeHint);
QCursor::setPos(mapToGlobal(QPoint(newSizeHint.width(), newSizeHint.height()- getDescriptionTextHeight()) - QPoint(frameSize.width() / 2, frameSize.height() / 2)));
}
}
}
void QtGridSelectionDialog::mousePressEvent(QMouseEvent*) {
hide();
setCurrentGridSize(currentGridSize);
}
void QtGridSelectionDialog::paintEvent(QPaintEvent*) {
QPainter painter(this);
// draw grid
QRect gridCell = QRect(QPoint(0,0), frameSize);
painter.setBrush(palette().highlight());
painter.setPen(Qt::NoPen);
for (int x = 0; x < currentGridSize.width(); x++) {
for (int y = 0; y < currentGridSize.height(); y++) {
int xPos = horizontalMargin + (x * (frameSize.width() + padding));
int yPos = verticalMargin + (y * (frameSize.height() + padding));
gridCell.moveTo(QPoint(xPos, yPos));
painter.drawRect(gridCell);
}
}
// draw description text
auto fontMetrics = QFontMetrics(QApplication::font());
auto descriptionBB = fontMetrics.boundingRect(QRect(0,0, width() - 2 * horizontalMargin,0), Qt::AlignHCenter | Qt::AlignTop | Qt::TextWordWrap, descriptionText, 0, nullptr);
QStyleOption opt;
opt.initFrom(this);
int textY = verticalMargin + (currentGridSize.height() * (frameSize.height() + padding));
int textX = (size().width() - descriptionBB.width()) / 2;
style()->drawItemText(&painter, QRect(textX, textY, descriptionBB.width(), descriptionBB.height()), Qt::AlignHCenter | Qt::AlignTop | Qt::TextWordWrap, opt.palette, true, descriptionText, foregroundRole());
}
void QtGridSelectionDialog::showEvent(QShowEvent*) {
timerId = startTimer(1000 / 25);
}
void QtGridSelectionDialog::hideEvent(QHideEvent*) {
killTimer(timerId);
}
void QtGridSelectionDialog::timerEvent(QTimerEvent*) {
const QPoint diff = QCursor::pos() - frameGeometry().topLeft() - QPoint(horizontalMargin, verticalMargin);
const auto toleranceFactor = 4; // Ratio of how far (1/tolerance) the mouse should move for the next frame to be plotted
// dx, dy - mouse position with respect to first top-left square
const auto dx = diff.x();
const auto dy = diff.y();
// width, height - dimension of each square with padding
const auto width = frameSize.width() + padding;
const auto height = frameSize.height() + padding;
// xThreshold, yThreshold - how far the mouse should be moved so that a new square is added or the existing one is hidden
const auto xThreshold = width / toleranceFactor;
const auto yThreshold = height / toleranceFactor;
const auto getSize = [](int length, int threshold, int delta) {
if (delta < length + threshold) {
return 1;
}
else {
return (delta + (length - threshold)) / length;
}
};
const QSize newGridSize(getSize(width, xThreshold, dx), getSize(height, yThreshold, dy));
if (minGridSize.expandedTo(newGridSize).boundedTo(maxGridSize) != currentGridSize) {
currentGridSize = minGridSize.expandedTo(newGridSize).boundedTo(maxGridSize);
resize(sizeHint());
}
}
bool QtGridSelectionDialog::event(QEvent* event) {
// Hide the window when it becomes a non-top-level window.
if (event->type() == QEvent::WindowDeactivate) {
hide();
return true;
}
return QWidget::event(event);
}
}
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