From 972162123678dbf4fb7fcebf1b561b52488d1cb6 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 2 Aug 2018 18:44:39 +0200
Subject: [server] Show drop position when moving frame around

---
 src/server/mainwindow/mainwindow.cpp | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

(limited to 'src/server/mainwindow/mainwindow.cpp')

diff --git a/src/server/mainwindow/mainwindow.cpp b/src/server/mainwindow/mainwindow.cpp
index 15aabd4..6ff8fc3 100644
--- a/src/server/mainwindow/mainwindow.cpp
+++ b/src/server/mainwindow/mainwindow.cpp
@@ -108,6 +108,9 @@ MainWindow::MainWindow(QWidget* parent) :
 	_examModeLabel->setAlignment(Qt::AlignCenter);
 	_examModeLabel->setFixedHeight(400);
 	ui->toolBar->insertWidget(ui->action_TutorToStudent, _examModeLabel);
+	_dropMarker = new QLabel(ui->frmRoom);
+	_dropMarker->setStyleSheet("background-color: #448; border-radius: 2px;");
+	_dropMarker->hide();
 
 	serverApp->setExam(false);
 
@@ -258,7 +261,7 @@ QPoint MainWindow::closestFreeSlot(QPoint preferredPixels, ConnectionFrame* toIg
 		}
 	}
 	const QSize& clientSize = serverApp->getCurrentRoom()->clientSize;
-#define GRID(X,Y) (grid[((X) * _tilesX) + (Y)])
+#define GRID(X,Y) (grid[((X) * _tilesY) + (Y)])
 	bool *grid = new bool[_tilesX * _tilesY];
 	memset(grid, 0, sizeof(bool) * size_t(_tilesX * _tilesY)); /* set everything to false */
 
@@ -282,8 +285,9 @@ QPoint MainWindow::closestFreeSlot(QPoint preferredPixels, ConnectionFrame* toIg
 		for ( int y = 0; y <= _tilesY - clientSize.height(); y++) {
 			/* check if (x,y) is free */
 			bool isFree = true;
-			for (int dx = 0; dx < clientSize.width(); dx++) {
-				for (int dy = 0; dy < clientSize.height(); dy++) {
+			int dx, dy = 0;
+			for (dx = 0; dx < clientSize.width(); dx++) {
+				for (dy = 0; dy < clientSize.height(); dy++) {
 					if (GRID(x + dx, y + dy)) {
 						isFree = false;
 						goto endLoop; // double-break
@@ -302,8 +306,11 @@ endLoop: ;
 endSearch: ;
 #undef GRID
 	delete[] grid;
+	if (freePositions.isEmpty() && toIgnore != nullptr) {
+		return toIgnore->getGridPosition();
+	}
 	/* among all the free positions, find the closest */
-	int min_distance = 1000000;
+	int min_distance = 10000000;
 	QPoint bestPosition = QPoint(0, 0);
 
 	for (QPoint freePos : freePositions) {
@@ -341,8 +348,9 @@ ConnectionFrame* MainWindow::createFrame(const QString &computerId, const QPoint
 	cf->setComputerId(computerId);
 	_clientFrames.append(cf);
 	cf->show();
-	connect(cf, SIGNAL(frameMoved(ConnectionFrame *)), this, SLOT(onPlaceFrame(ConnectionFrame *)));
+	connect(cf, SIGNAL(frameMoved(ConnectionFrame *)), this, SLOT(onFrameDropped(ConnectionFrame *)));
 	connect(cf, SIGNAL(clicked(ConnectionFrame *)), this, SLOT(onFrameClicked(ConnectionFrame *)));
+	connect(cf, SIGNAL(frameMoving(ConnectionFrame *)), this, SLOT(onFrameMoving(ConnectionFrame *)));
 	return cf;
 }
 
@@ -602,13 +610,24 @@ void MainWindow::reset(bool lock)
  * Slots
  */
 
+void MainWindow::onFrameMoving(ConnectionFrame* connectionFrame)
+{
+	QPoint slot = closestFreeSlot(connectionFrame->pos(), connectionFrame);
+	_dropMarker->setGeometry(slot.x() * getTileWidthPx(), slot.y() * getTileHeightPx(), connectionFrame->width(), connectionFrame->height());
+	if (!_dropMarker->isVisible()) {
+		_dropMarker->lower();
+		ui->imageLabel->lower();
+		_dropMarker->show();
+	}
+}
 
 /**
 * Place frame to from user specified position. Should be called when a
 * connectionFrame is dropped during the "drag-n-drop".
  */
-void MainWindow::onPlaceFrame(ConnectionFrame* connectionFrame)
+void MainWindow::onFrameDropped(ConnectionFrame* connectionFrame)
 {
+	_dropMarker->hide();
 	// if (_tilesX <= 0 || _tilesY <= 0) return;
 	const QPoint preferredPixels = connectionFrame->pos();
 	placeFrameInFreeSlot(connectionFrame, preferredPixels);
@@ -622,6 +641,7 @@ void MainWindow::onPlaceFrame(ConnectionFrame* connectionFrame)
  */
 void MainWindow::onFrameClicked(ConnectionFrame* frame)
 {
+	_dropMarker->hide();
 	ConnectionFrame *current = getSelectedFrame();
 	// If same frame is clicked again,, do nothing
 	if (current == frame)
@@ -743,7 +763,7 @@ void MainWindow::reloadCurrentRoom()
 			QPoint pos = it.value();
 
 			ConnectionFrame *cf = createFrame(computerId, &pos, true);
-			onPlaceFrame(cf);
+			onFrameDropped(cf);
 			if (computerId == room->tutorIP) {
 				qDebug() << "set computer with id " << computerId << " as tutor per configuration";
 				if (getTutorFrame() != nullptr) {
-- 
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