1 files changed, 194 insertions, 0 deletions
diff --git a/Swift/QtUI/Trellis/QtGridSelectionDialog.cpp b/Swift/QtUI/Trellis/QtGridSelectionDialog.cpp
new file mode 100644
index 0000000..e922e07
--- /dev/null
+++ b/Swift/QtUI/Trellis/QtGridSelectionDialog.cpp
@@ -0,0 +1,194 @@
+/*
+ * 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);
+}
+
+}