Hover on items in tree

gui/basewindow.cc

@@ -109,6 +109,7 @@ BaseMainWindow::BaseMainWindow(std::unique_ptr<Context> context, ArchArgs args,
     connect(designview, &DesignWidget::selected, fpgaView, &FPGAViewWidget::onSelectedArchItem);
     connect(designview, &DesignWidget::zoomSelected, fpgaView, &FPGAViewWidget::zoomSelected);
     connect(designview, &DesignWidget::highlight, fpgaView, &FPGAViewWidget::onHighlightGroupChanged);
+    connect(designview, &DesignWidget::hover, fpgaView, &FPGAViewWidget::onHoverItemChanged);
 
     // Click event on device view
     connect(fpgaView, &FPGAViewWidget::clickedBel, designview, &DesignWidget::onClickedBel);

gui/designwidget.cc

@@ -30,15 +30,34 @@
 
 NEXTPNR_NAMESPACE_BEGIN
 
+TreeView::TreeView(QWidget *parent) : QTreeView(parent) {}
+
+TreeView::~TreeView() {}
+
+void TreeView::mouseMoveEvent(QMouseEvent *event)
+{
+    QModelIndex index = indexAt(event->pos());
+    if (index!=current) {
+        current = index;
+        Q_EMIT hoverIndexChanged(index);
+    }
+    QTreeView::mouseMoveEvent(event);
+}
+
+void TreeView::leaveEvent(QEvent *event)
+{
+    Q_EMIT hoverIndexChanged(QModelIndex());
+}
+
 DesignWidget::DesignWidget(QWidget *parent) : QWidget(parent), ctx(nullptr), selectionModel(nullptr)
 {
     // Add tree view
-    treeView = new QTreeView();
+    treeView = new TreeView();
     treeModel = new TreeModel::Model();
     treeView->setModel(treeModel);
     treeView->setContextMenuPolicy(Qt::CustomContextMenu);
     treeView->setSelectionMode(QAbstractItemView::ExtendedSelection);
-
+    treeView->viewport()->setMouseTracking(true);
     // Add property view
     variantManager = new QtVariantPropertyManager(this);
     readOnlyManager = new QtVariantPropertyManager(this);
@@ -159,8 +178,9 @@ DesignWidget::DesignWidget(QWidget *parent) : QWidget(parent), ctx(nullptr), sel
             &DesignWidget::prepareMenuProperty);
     connect(propertyEditor->treeWidget(), &QTreeWidget::itemDoubleClicked, this, &DesignWidget::onItemDoubleClicked);
 
-    connect(treeView, &QTreeView::customContextMenuRequested, this, &DesignWidget::prepareMenuTree);
-    connect(treeView, &QTreeView::doubleClicked, this, &DesignWidget::onDoubleClicked);
+    connect(treeView, &TreeView::customContextMenuRequested, this, &DesignWidget::prepareMenuTree);
+    connect(treeView, &TreeView::doubleClicked, this, &DesignWidget::onDoubleClicked);
+    connect(treeView, &TreeView::hoverIndexChanged, this, &DesignWidget::onHoverIndexChanged);
     selectionModel = treeView->selectionModel();
     connect(selectionModel, &QItemSelectionModel::selectionChanged, this, &DesignWidget::onSelectionChanged);
 
@@ -388,7 +408,6 @@ void DesignWidget::onSelectionChanged(const QItemSelection &, const QItemSelecti
     ElementType type = clickItem->type();
     if (type == ElementType::NONE)
         return;
-    std::vector<DecalXY> decals;
 
     addToHistory(index);
 
@@ -800,4 +819,17 @@ void DesignWidget::onSearchInserted()
     if (currentSearchIndexes.size() > 0 && currentIndex < currentSearchIndexes.size())
         selectionModel->setCurrentIndex(currentSearchIndexes.at(currentIndex), QItemSelectionModel::ClearAndSelect);
 }
+
+void DesignWidget::onHoverIndexChanged(QModelIndex index)
+{
+    if (index.isValid()) {
+        TreeModel::Item *item = treeModel->nodeFromIndex(index);
+        if (item->type() != ElementType::NONE) {
+            Q_EMIT hover(getDecals(item->type(), item->id()).at(0));
+            return;
+        }
+    }
+    Q_EMIT hover(DecalXY());    
+}
+
 NEXTPNR_NAMESPACE_END

gui/designwidget.h

@@ -22,6 +22,7 @@
 
 #include <QTreeView>
 #include <QVariant>
+#include <QMouseEvent>
 #include "nextpnr.h"
 #include "qtgroupboxpropertybrowser.h"
 #include "qtpropertymanager.h"
@@ -31,6 +32,22 @@
 
 NEXTPNR_NAMESPACE_BEGIN
 
+class TreeView : public QTreeView
+{
+    Q_OBJECT
+  
+  public:
+    explicit TreeView(QWidget *parent = 0);
+    ~TreeView();
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void leaveEvent(QEvent *event) override;
+
+  Q_SIGNALS:
+    void hoverIndexChanged(QModelIndex index);
+  private:
+    QModelIndex current;
+};
+
 class DesignWidget : public QWidget
 {
     Q_OBJECT
@@ -55,6 +72,7 @@ class DesignWidget : public QWidget
   Q_SIGNALS:
     void selected(std::vector<DecalXY> decal, bool keep);
     void highlight(std::vector<DecalXY> decal, int group);
+    void hover(DecalXY decal);
     void zoomSelected();
 
   private Q_SLOTS:
@@ -64,6 +82,7 @@ class DesignWidget : public QWidget
     void onItemDoubleClicked(QTreeWidgetItem *item, int column);
     void onDoubleClicked(const QModelIndex &index);
     void onSearchInserted();
+    void onHoverIndexChanged(QModelIndex index);
   public Q_SLOTS:
     void newContext(Context *ctx);
     void updateTree();
@@ -74,7 +93,7 @@ class DesignWidget : public QWidget
   private:
     Context *ctx;
 
-    QTreeView *treeView;
+    TreeView *treeView;
     QItemSelectionModel *selectionModel;
     TreeModel::Model *treeModel;
     QLineEdit *searchEdit;

gui/fpgaviewwidget.cc

@@ -559,6 +559,14 @@ void FPGAViewWidget::onHighlightGroupChanged(std::vector<DecalXY> decals, int gr
     pokeRenderer();
 }
 
+void FPGAViewWidget::onHoverItemChanged(DecalXY decal)
+{
+    QMutexLocker locked(&rendererArgsLock_);
+    rendererArgs_->hoveredDecal = decal;
+    rendererArgs_->changed = true;
+    pokeRenderer();
+}
+
 void FPGAViewWidget::resizeGL(int width, int height) {}
 
 boost::optional<FPGAViewWidget::PickedElement> FPGAViewWidget::pickElement(float worldx, float worldy)

gui/fpgaviewwidget.h

@@ -113,6 +113,7 @@ class FPGAViewWidget : public QOpenGLWidget, protected QOpenGLFunctions
     void newContext(Context *ctx);
     void onSelectedArchItem(std::vector<DecalXY> decals, bool keep);
     void onHighlightGroupChanged(std::vector<DecalXY> decals, int group);
+    void onHoverItemChanged(DecalXY decal);
     void pokeRenderer(void);
     void zoomIn();
     void zoomOut();