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prevent dropping an variable without data in the visu
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r876:da9523540c62
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@@ -1,336 +1,353
1 #include "DragDropHelper.h"
1 #include "DragDropHelper.h"
2 #include "SqpApplication.h"
2 #include "SqpApplication.h"
3 #include "Visualization/VisualizationDragDropContainer.h"
3 #include "Visualization/VisualizationDragDropContainer.h"
4 #include "Visualization/VisualizationDragWidget.h"
4 #include "Visualization/VisualizationDragWidget.h"
5 #include "Visualization/VisualizationWidget.h"
5 #include "Visualization/VisualizationWidget.h"
6 #include "Visualization/operations/FindVariableOperation.h"
6 #include "Visualization/operations/FindVariableOperation.h"
7
7
8 #include "Variable/Variable.h"
8 #include "Variable/VariableController.h"
9 #include "Variable/VariableController.h"
9
10
10 #include "Common/MimeTypesDef.h"
11 #include "Common/MimeTypesDef.h"
11 #include "Common/VisualizationDef.h"
12 #include "Common/VisualizationDef.h"
12
13
13 #include <QDir>
14 #include <QDir>
14 #include <QDragEnterEvent>
15 #include <QDragEnterEvent>
15 #include <QDragMoveEvent>
16 #include <QDragMoveEvent>
16 #include <QScrollArea>
17 #include <QScrollArea>
17 #include <QScrollBar>
18 #include <QScrollBar>
18 #include <QTimer>
19 #include <QTimer>
19 #include <QVBoxLayout>
20 #include <QVBoxLayout>
20
21
21 const int SCROLL_SPEED = 5;
22 const int SCROLL_SPEED = 5;
22 const int SCROLL_ZONE_SIZE = 50;
23 const int SCROLL_ZONE_SIZE = 50;
23
24
24 Q_LOGGING_CATEGORY(LOG_DragDropHelper, "DragDrophelper")
25 Q_LOGGING_CATEGORY(LOG_DragDropHelper, "DragDrophelper")
25
26
26 struct DragDropScroller::DragDropScrollerPrivate {
27 struct DragDropScroller::DragDropScrollerPrivate {
27
28
28 QList<QScrollArea *> m_ScrollAreas;
29 QList<QScrollArea *> m_ScrollAreas;
29 QScrollArea *m_CurrentScrollArea = nullptr;
30 QScrollArea *m_CurrentScrollArea = nullptr;
30 std::unique_ptr<QTimer> m_Timer = nullptr;
31 std::unique_ptr<QTimer> m_Timer = nullptr;
31
32
32 enum class ScrollDirection { up, down, unknown };
33 enum class ScrollDirection { up, down, unknown };
33 ScrollDirection m_Direction = ScrollDirection::unknown;
34 ScrollDirection m_Direction = ScrollDirection::unknown;
34
35
35 explicit DragDropScrollerPrivate() : m_Timer{std::make_unique<QTimer>()}
36 explicit DragDropScrollerPrivate() : m_Timer{std::make_unique<QTimer>()}
36 {
37 {
37 m_Timer->setInterval(0);
38 m_Timer->setInterval(0);
38 }
39 }
39 };
40 };
40
41
41 DragDropScroller::DragDropScroller(QObject *parent)
42 DragDropScroller::DragDropScroller(QObject *parent)
42 : QObject{parent}, impl{spimpl::make_unique_impl<DragDropScrollerPrivate>()}
43 : QObject{parent}, impl{spimpl::make_unique_impl<DragDropScrollerPrivate>()}
43 {
44 {
44 connect(impl->m_Timer.get(), &QTimer::timeout, this, &DragDropScroller::onTimer);
45 connect(impl->m_Timer.get(), &QTimer::timeout, this, &DragDropScroller::onTimer);
45 }
46 }
46
47
47 void DragDropScroller::addScrollArea(QScrollArea *scrollArea)
48 void DragDropScroller::addScrollArea(QScrollArea *scrollArea)
48 {
49 {
49 impl->m_ScrollAreas << scrollArea;
50 impl->m_ScrollAreas << scrollArea;
50 scrollArea->viewport()->setAcceptDrops(true);
51 scrollArea->viewport()->setAcceptDrops(true);
51 }
52 }
52
53
53 void DragDropScroller::removeScrollArea(QScrollArea *scrollArea)
54 void DragDropScroller::removeScrollArea(QScrollArea *scrollArea)
54 {
55 {
55 impl->m_ScrollAreas.removeAll(scrollArea);
56 impl->m_ScrollAreas.removeAll(scrollArea);
56 scrollArea->viewport()->setAcceptDrops(false);
57 scrollArea->viewport()->setAcceptDrops(false);
57 }
58 }
58
59
59 bool DragDropScroller::eventFilter(QObject *obj, QEvent *event)
60 bool DragDropScroller::eventFilter(QObject *obj, QEvent *event)
60 {
61 {
61 if (event->type() == QEvent::DragMove) {
62 if (event->type() == QEvent::DragMove) {
62 auto w = static_cast<QWidget *>(obj);
63 auto w = static_cast<QWidget *>(obj);
63
64
64 if (impl->m_CurrentScrollArea && impl->m_CurrentScrollArea->isAncestorOf(w)) {
65 if (impl->m_CurrentScrollArea && impl->m_CurrentScrollArea->isAncestorOf(w)) {
65 auto moveEvent = static_cast<QDragMoveEvent *>(event);
66 auto moveEvent = static_cast<QDragMoveEvent *>(event);
66
67
67 auto pos = moveEvent->pos();
68 auto pos = moveEvent->pos();
68 if (impl->m_CurrentScrollArea->viewport() != w) {
69 if (impl->m_CurrentScrollArea->viewport() != w) {
69 auto globalPos = w->mapToGlobal(moveEvent->pos());
70 auto globalPos = w->mapToGlobal(moveEvent->pos());
70 pos = impl->m_CurrentScrollArea->viewport()->mapFromGlobal(globalPos);
71 pos = impl->m_CurrentScrollArea->viewport()->mapFromGlobal(globalPos);
71 }
72 }
72
73
73 auto isInTopZone = pos.y() > impl->m_CurrentScrollArea->viewport()->size().height()
74 auto isInTopZone = pos.y() > impl->m_CurrentScrollArea->viewport()->size().height()
74 - SCROLL_ZONE_SIZE;
75 - SCROLL_ZONE_SIZE;
75 auto isInBottomZone = pos.y() < SCROLL_ZONE_SIZE;
76 auto isInBottomZone = pos.y() < SCROLL_ZONE_SIZE;
76
77
77 if (!isInTopZone && !isInBottomZone) {
78 if (!isInTopZone && !isInBottomZone) {
78 impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
79 impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
79 impl->m_Timer->stop();
80 impl->m_Timer->stop();
80 }
81 }
81 else if (!impl->m_Timer->isActive()) {
82 else if (!impl->m_Timer->isActive()) {
82 impl->m_Direction = isInTopZone ? DragDropScrollerPrivate::ScrollDirection::up
83 impl->m_Direction = isInTopZone ? DragDropScrollerPrivate::ScrollDirection::up
83 : DragDropScrollerPrivate::ScrollDirection::down;
84 : DragDropScrollerPrivate::ScrollDirection::down;
84 impl->m_Timer->start();
85 impl->m_Timer->start();
85 }
86 }
86 }
87 }
87 }
88 }
88 else if (event->type() == QEvent::DragEnter) {
89 else if (event->type() == QEvent::DragEnter) {
89 auto w = static_cast<QWidget *>(obj);
90 auto w = static_cast<QWidget *>(obj);
90
91
91 for (auto scrollArea : impl->m_ScrollAreas) {
92 for (auto scrollArea : impl->m_ScrollAreas) {
92 if (impl->m_CurrentScrollArea != scrollArea && scrollArea->isAncestorOf(w)) {
93 if (impl->m_CurrentScrollArea != scrollArea && scrollArea->isAncestorOf(w)) {
93 auto enterEvent = static_cast<QDragEnterEvent *>(event);
94 auto enterEvent = static_cast<QDragEnterEvent *>(event);
94 enterEvent->acceptProposedAction();
95 enterEvent->acceptProposedAction();
95 enterEvent->setDropAction(Qt::IgnoreAction);
96 enterEvent->setDropAction(Qt::IgnoreAction);
96 impl->m_CurrentScrollArea = scrollArea;
97 impl->m_CurrentScrollArea = scrollArea;
97 break;
98 break;
98 }
99 }
99 }
100 }
100 }
101 }
101 else if (event->type() == QEvent::DragLeave) {
102 else if (event->type() == QEvent::DragLeave) {
102 if (impl->m_CurrentScrollArea) {
103 if (impl->m_CurrentScrollArea) {
103 if (!QRect(QPoint(), impl->m_CurrentScrollArea->size())
104 if (!QRect(QPoint(), impl->m_CurrentScrollArea->size())
104 .contains(impl->m_CurrentScrollArea->mapFromGlobal(QCursor::pos()))) {
105 .contains(impl->m_CurrentScrollArea->mapFromGlobal(QCursor::pos()))) {
105 impl->m_CurrentScrollArea = nullptr;
106 impl->m_CurrentScrollArea = nullptr;
106 impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
107 impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
107 impl->m_Timer->stop();
108 impl->m_Timer->stop();
108 }
109 }
109 }
110 }
110 }
111 }
111 else if (event->type() == QEvent::Drop) {
112 else if (event->type() == QEvent::Drop) {
112 if (impl->m_CurrentScrollArea) {
113 if (impl->m_CurrentScrollArea) {
113 impl->m_CurrentScrollArea = nullptr;
114 impl->m_CurrentScrollArea = nullptr;
114 impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
115 impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown;
115 impl->m_Timer->stop();
116 impl->m_Timer->stop();
116 }
117 }
117 }
118 }
118
119
119 return false;
120 return false;
120 }
121 }
121
122
122 void DragDropScroller::onTimer()
123 void DragDropScroller::onTimer()
123 {
124 {
124 if (impl->m_CurrentScrollArea) {
125 if (impl->m_CurrentScrollArea) {
125 auto mvt = 0;
126 auto mvt = 0;
126 switch (impl->m_Direction) {
127 switch (impl->m_Direction) {
127 case DragDropScrollerPrivate::ScrollDirection::up:
128 case DragDropScrollerPrivate::ScrollDirection::up:
128 mvt = SCROLL_SPEED;
129 mvt = SCROLL_SPEED;
129 break;
130 break;
130 case DragDropScrollerPrivate::ScrollDirection::down:
131 case DragDropScrollerPrivate::ScrollDirection::down:
131 mvt = -SCROLL_SPEED;
132 mvt = -SCROLL_SPEED;
132 break;
133 break;
133 default:
134 default:
134 break;
135 break;
135 }
136 }
136
137
137 impl->m_CurrentScrollArea->verticalScrollBar()->setValue(
138 impl->m_CurrentScrollArea->verticalScrollBar()->setValue(
138 impl->m_CurrentScrollArea->verticalScrollBar()->value() + mvt);
139 impl->m_CurrentScrollArea->verticalScrollBar()->value() + mvt);
139 }
140 }
140 }
141 }
141
142
142 struct DragDropHelper::DragDropHelperPrivate {
143 struct DragDropHelper::DragDropHelperPrivate {
143
144
144 VisualizationDragWidget *m_CurrentDragWidget = nullptr;
145 VisualizationDragWidget *m_CurrentDragWidget = nullptr;
145 std::unique_ptr<QWidget> m_PlaceHolder = nullptr;
146 std::unique_ptr<QWidget> m_PlaceHolder = nullptr;
146 std::unique_ptr<DragDropScroller> m_DragDropScroller = nullptr;
147 std::unique_ptr<DragDropScroller> m_DragDropScroller = nullptr;
147 QString m_ImageTempUrl; // Temporary file for image url generated by the drag & drop. Not using
148 QString m_ImageTempUrl; // Temporary file for image url generated by the drag & drop. Not using
148 // QTemporaryFile to have a name which is not generated.
149 // QTemporaryFile to have a name which is not generated.
149
150
150 VisualizationDragWidget *m_HighlightedDragWidget = nullptr;
151 VisualizationDragWidget *m_HighlightedDragWidget = nullptr;
151
152
152 QMetaObject::Connection m_DragWidgetDestroyedConnection;
153 QMetaObject::Connection m_DragWidgetDestroyedConnection;
153 QMetaObject::Connection m_HighlightedWidgetDestroyedConnection;
154 QMetaObject::Connection m_HighlightedWidgetDestroyedConnection;
154
155
155 explicit DragDropHelperPrivate()
156 explicit DragDropHelperPrivate()
156 : m_PlaceHolder{std::make_unique<QWidget>()},
157 : m_PlaceHolder{std::make_unique<QWidget>()},
157 m_DragDropScroller{std::make_unique<DragDropScroller>()}
158 m_DragDropScroller{std::make_unique<DragDropScroller>()}
158 {
159 {
159 m_PlaceHolder->setStyleSheet("background-color: #BBD5EE; border:2px solid #2A7FD4");
160 m_PlaceHolder->setStyleSheet("background-color: #BBD5EE; border:2px solid #2A7FD4");
160 sqpApp->installEventFilter(m_DragDropScroller.get());
161 sqpApp->installEventFilter(m_DragDropScroller.get());
161
162
162
163
163 m_ImageTempUrl = QDir::temp().absoluteFilePath("Scqlop_graph.png");
164 m_ImageTempUrl = QDir::temp().absoluteFilePath("Sciqlop_graph.png");
164 }
165 }
165
166
166 void preparePlaceHolder() const
167 void preparePlaceHolder() const
167 {
168 {
168 if (m_CurrentDragWidget) {
169 if (m_CurrentDragWidget) {
169 m_PlaceHolder->setMinimumSize(m_CurrentDragWidget->size());
170 m_PlaceHolder->setMinimumSize(m_CurrentDragWidget->size());
170 m_PlaceHolder->setSizePolicy(m_CurrentDragWidget->sizePolicy());
171 m_PlaceHolder->setSizePolicy(m_CurrentDragWidget->sizePolicy());
171 }
172 }
172 else {
173 else {
173 // Configuration of the placeHolder when there is no dragWidget
174 // Configuration of the placeHolder when there is no dragWidget
174 // (for instance with a drag from a variable)
175 // (for instance with a drag from a variable)
175
176
176 m_PlaceHolder->setMinimumSize(0, GRAPH_MINIMUM_HEIGHT);
177 m_PlaceHolder->setMinimumSize(0, GRAPH_MINIMUM_HEIGHT);
177 m_PlaceHolder->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
178 m_PlaceHolder->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
178 }
179 }
179 }
180 }
180 };
181 };
181
182
182
183
183 DragDropHelper::DragDropHelper() : impl{spimpl::make_unique_impl<DragDropHelperPrivate>()}
184 DragDropHelper::DragDropHelper() : impl{spimpl::make_unique_impl<DragDropHelperPrivate>()}
184 {
185 {
185 }
186 }
186
187
187 DragDropHelper::~DragDropHelper()
188 DragDropHelper::~DragDropHelper()
188 {
189 {
189 QFile::remove(impl->m_ImageTempUrl);
190 QFile::remove(impl->m_ImageTempUrl);
190 }
191 }
191
192
192 void DragDropHelper::resetDragAndDrop()
193 void DragDropHelper::resetDragAndDrop()
193 {
194 {
194 setCurrentDragWidget(nullptr);
195 setCurrentDragWidget(nullptr);
195 impl->m_HighlightedDragWidget = nullptr;
196 impl->m_HighlightedDragWidget = nullptr;
196 }
197 }
197
198
198 void DragDropHelper::setCurrentDragWidget(VisualizationDragWidget *dragWidget)
199 void DragDropHelper::setCurrentDragWidget(VisualizationDragWidget *dragWidget)
199 {
200 {
200 if (impl->m_CurrentDragWidget) {
201 if (impl->m_CurrentDragWidget) {
201
202
202 QObject::disconnect(impl->m_DragWidgetDestroyedConnection);
203 QObject::disconnect(impl->m_DragWidgetDestroyedConnection);
203 }
204 }
204
205
205 if (dragWidget) {
206 if (dragWidget) {
206 // ensures the impl->m_CurrentDragWidget is reset when the widget is destroyed
207 // ensures the impl->m_CurrentDragWidget is reset when the widget is destroyed
207 impl->m_DragWidgetDestroyedConnection
208 impl->m_DragWidgetDestroyedConnection
208 = QObject::connect(dragWidget, &VisualizationDragWidget::destroyed,
209 = QObject::connect(dragWidget, &VisualizationDragWidget::destroyed,
209 [this]() { impl->m_CurrentDragWidget = nullptr; });
210 [this]() { impl->m_CurrentDragWidget = nullptr; });
210 }
211 }
211
212
212 impl->m_CurrentDragWidget = dragWidget;
213 impl->m_CurrentDragWidget = dragWidget;
213 }
214 }
214
215
215 VisualizationDragWidget *DragDropHelper::getCurrentDragWidget() const
216 VisualizationDragWidget *DragDropHelper::getCurrentDragWidget() const
216 {
217 {
217 return impl->m_CurrentDragWidget;
218 return impl->m_CurrentDragWidget;
218 }
219 }
219
220
220
221
221 QWidget &DragDropHelper::placeHolder() const
222 QWidget &DragDropHelper::placeHolder() const
222 {
223 {
223 return *impl->m_PlaceHolder;
224 return *impl->m_PlaceHolder;
224 }
225 }
225
226
226 void DragDropHelper::insertPlaceHolder(QVBoxLayout *layout, int index)
227 void DragDropHelper::insertPlaceHolder(QVBoxLayout *layout, int index)
227 {
228 {
228 removePlaceHolder();
229 removePlaceHolder();
229 impl->preparePlaceHolder();
230 impl->preparePlaceHolder();
230 layout->insertWidget(index, impl->m_PlaceHolder.get());
231 layout->insertWidget(index, impl->m_PlaceHolder.get());
231 impl->m_PlaceHolder->show();
232 impl->m_PlaceHolder->show();
232 }
233 }
233
234
234 void DragDropHelper::removePlaceHolder()
235 void DragDropHelper::removePlaceHolder()
235 {
236 {
236 auto parentWidget = impl->m_PlaceHolder->parentWidget();
237 auto parentWidget = impl->m_PlaceHolder->parentWidget();
237 if (parentWidget) {
238 if (parentWidget) {
238 parentWidget->layout()->removeWidget(impl->m_PlaceHolder.get());
239 parentWidget->layout()->removeWidget(impl->m_PlaceHolder.get());
239 impl->m_PlaceHolder->setParent(nullptr);
240 impl->m_PlaceHolder->setParent(nullptr);
240 impl->m_PlaceHolder->hide();
241 impl->m_PlaceHolder->hide();
241 }
242 }
242 }
243 }
243
244
244 bool DragDropHelper::isPlaceHolderSet() const
245 bool DragDropHelper::isPlaceHolderSet() const
245 {
246 {
246 return impl->m_PlaceHolder->parentWidget();
247 return impl->m_PlaceHolder->parentWidget();
247 }
248 }
248
249
249 void DragDropHelper::addDragDropScrollArea(QScrollArea *scrollArea)
250 void DragDropHelper::addDragDropScrollArea(QScrollArea *scrollArea)
250 {
251 {
251 impl->m_DragDropScroller->addScrollArea(scrollArea);
252 impl->m_DragDropScroller->addScrollArea(scrollArea);
252 }
253 }
253
254
254 void DragDropHelper::removeDragDropScrollArea(QScrollArea *scrollArea)
255 void DragDropHelper::removeDragDropScrollArea(QScrollArea *scrollArea)
255 {
256 {
256 impl->m_DragDropScroller->removeScrollArea(scrollArea);
257 impl->m_DragDropScroller->removeScrollArea(scrollArea);
257 }
258 }
258
259
259 QUrl DragDropHelper::imageTemporaryUrl(const QImage &image) const
260 QUrl DragDropHelper::imageTemporaryUrl(const QImage &image) const
260 {
261 {
261 image.save(impl->m_ImageTempUrl);
262 image.save(impl->m_ImageTempUrl);
262 return QUrl::fromLocalFile(impl->m_ImageTempUrl);
263 return QUrl::fromLocalFile(impl->m_ImageTempUrl);
263 }
264 }
264
265
265 void DragDropHelper::setHightlightedDragWidget(VisualizationDragWidget *dragWidget)
266 void DragDropHelper::setHightlightedDragWidget(VisualizationDragWidget *dragWidget)
266 {
267 {
267 if (impl->m_HighlightedDragWidget) {
268 if (impl->m_HighlightedDragWidget) {
268 impl->m_HighlightedDragWidget->highlightForMerge(false);
269 impl->m_HighlightedDragWidget->highlightForMerge(false);
269 QObject::disconnect(impl->m_HighlightedWidgetDestroyedConnection);
270 QObject::disconnect(impl->m_HighlightedWidgetDestroyedConnection);
270 }
271 }
271
272
272 if (dragWidget) {
273 if (dragWidget) {
273 dragWidget->highlightForMerge(true);
274 dragWidget->highlightForMerge(true);
274
275
275 // ensures the impl->m_HighlightedDragWidget is reset when the widget is destroyed
276 // ensures the impl->m_HighlightedDragWidget is reset when the widget is destroyed
276 impl->m_DragWidgetDestroyedConnection
277 impl->m_DragWidgetDestroyedConnection
277 = QObject::connect(dragWidget, &VisualizationDragWidget::destroyed,
278 = QObject::connect(dragWidget, &VisualizationDragWidget::destroyed,
278 [this]() { impl->m_HighlightedDragWidget = nullptr; });
279 [this]() { impl->m_HighlightedDragWidget = nullptr; });
279 }
280 }
280
281
281 impl->m_HighlightedDragWidget = dragWidget;
282 impl->m_HighlightedDragWidget = dragWidget;
282 }
283 }
283
284
284 VisualizationDragWidget *DragDropHelper::getHightlightedDragWidget() const
285 VisualizationDragWidget *DragDropHelper::getHightlightedDragWidget() const
285 {
286 {
286 return impl->m_HighlightedDragWidget;
287 return impl->m_HighlightedDragWidget;
287 }
288 }
288
289
289 bool DragDropHelper::checkMimeDataForVisualization(const QMimeData *mimeData,
290 bool DragDropHelper::checkMimeDataForVisualization(const QMimeData *mimeData,
290 VisualizationDragDropContainer *dropContainer)
291 VisualizationDragDropContainer *dropContainer)
291 {
292 {
292 if (!mimeData || !dropContainer) {
293 if (!mimeData || !dropContainer) {
293 qCWarning(LOG_DragDropHelper()) << QObject::tr(
294 qCWarning(LOG_DragDropHelper()) << QObject::tr(
294 "DragDropHelper::checkMimeDataForVisualization, invalid input parameters.");
295 "DragDropHelper::checkMimeDataForVisualization, invalid input parameters.");
295 Q_ASSERT(false);
296 Q_ASSERT(false);
297 return false;
296 }
298 }
297
299
298 auto result = true;
300 auto result = false;
299
301
300 if (mimeData->hasFormat(MIME_TYPE_VARIABLE_LIST)) {
302 if (mimeData->hasFormat(MIME_TYPE_VARIABLE_LIST)) {
301 auto variables = sqpApp->variableController().variablesForMimeData(
303 auto variables = sqpApp->variableController().variablesForMimeData(
302 mimeData->data(MIME_TYPE_VARIABLE_LIST));
304 mimeData->data(MIME_TYPE_VARIABLE_LIST));
303
305
304 if (variables.count() == 1) {
306 if (variables.count() == 1) {
305 // Check that the viariable is not already in a graph
306
307
307 // Search for the top level VisualizationWidget
308 auto variable = variables.first();
308 auto parent = dropContainer->parentWidget();
309 if (variable->dataSeries() != nullptr) {
309 while (parent && qobject_cast<VisualizationWidget *>(parent) == nullptr) {
310
310 parent = parent->parentWidget();
311 // Check that the variable is not already in a graph
311 }
312
312
313 if (parent) {
313 auto parent = dropContainer->parentWidget();
314 auto visualizationWidget = static_cast<VisualizationWidget *>(parent);
314 while (parent && qobject_cast<VisualizationWidget *>(parent) == nullptr) {
315 parent = parent->parentWidget(); // Search for the top level VisualizationWidget
316 }
315
317
316 FindVariableOperation findVariableOperation{variables.first()};
318 if (parent) {
317 visualizationWidget->accept(&findVariableOperation);
319 auto visualizationWidget = static_cast<VisualizationWidget *>(parent);
318 auto variableContainers = findVariableOperation.result();
320
319 if (!variableContainers.empty()) {
321 FindVariableOperation findVariableOperation{variable};
320 result = false;
322 visualizationWidget->accept(&findVariableOperation);
323 auto variableContainers = findVariableOperation.result();
324 if (variableContainers.empty()) {
325 result = true;
326 }
327 else {
328 // result = false: the variable already exist in the visualisation
329 }
330 }
331 else {
332 qCWarning(LOG_DragDropHelper()) << QObject::tr(
333 "DragDropHelper::checkMimeDataForVisualization, the parent "
334 "VisualizationWidget cannot be found. Cannot check if the variable is "
335 "already used or not.");
321 }
336 }
322 }
337 }
323 else {
338 else {
324 qCWarning(LOG_DragDropHelper()) << QObject::tr(
339 // result = false: the variable is not fully loaded
325 "DragDropHelper::checkMimeDataForVisualization, the parent "
326 "VisualizationWidget cannot be found.");
327 result = false;
328 }
340 }
329 }
341 }
330 else {
342 else {
331 result = false;
343 // result = false: cannot drop multiple variables in the visualisation
332 }
344 }
333 }
345 }
346 else {
347 // Other MIME data
348 // no special rules, accepted by default
349 result = true;
350 }
334
351
335 return result;
352 return result;
336 }
353 }
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