drag: cusTabwidget basic drag.

Gui/Control/cusTableWidget.cpp

@@ -1,9 +1,11 @@
 #include "cusTableWidget.h"
+
+#include <QApplication>
 #include <QDrag>
 #include <QMimeData>
 #include <QPainter>
 
-CustomTableWidget::CustomTableWidget(QWidget* parent)
+CustomTableWidget::CustomTableWidget(QWidget* parent) : QTableWidget(parent)
 {
 }
 
@@ -17,22 +19,10 @@ void CustomTableWidget::dropEvent(QDropEvent* event)
         event->ignore();
         return;
     }
-
-    QModelIndex index = indexAt(event->pos());
-    if (!index.isValid()) {
-        event->ignore();
-        return;
-    }
-
-    QString data = QString::fromUtf8(event->mimeData()->data("application/x-custom-data"));
-    QStringList items = data.split(",");
-
-    //emit customDropRequested(items.first(), index.row(), index.column(), event->source());
-
-    event->acceptProposedAction();
+    QTableWidget::dropEvent(event);
 }
 
-void CustomTableWidget::dragMoveEvent(QDragMoveEvent* event)
+void CustomTableWidget::dragEnterEvent(QDragEnterEvent* event)
 {
     const QTableWidget* source = qobject_cast<const QTableWidget*>(event->source());
     if (source == this) {
@@ -40,28 +30,44 @@ void CustomTableWidget::dragMoveEvent(QDragMoveEvent* event)
         return;
     }
     if (event->mimeData()->hasFormat("application/x-custom-data")) {
-        event->setDropAction(Qt::MoveAction);
         event->acceptProposedAction();
     } else {
         event->ignore();
     }
 }
 
-void CustomTableWidget::startDrag(Qt::DropActions supportedActions)
+void CustomTableWidget::mouseMoveEvent(QMouseEvent* event)
 {
+    if (!(event->buttons() & Qt::LeftButton)) {
+        return;
+    }
+    if ((event->pos() - startPos_).manhattanLength() < QApplication::startDragDistance()) {
+        return;
+    }
+
     QDrag* drag = new QDrag(this);
     QMimeData* mimeData = new QMimeData;
 
     QStringList selectedTexts;
     foreach (QTableWidgetItem* item, selectedItems()) {
-        selectedTexts << item->text();
+        if (item->column() == 1) {
+            selectedTexts << item->text();
+        }
     }
-    mimeData->setData("application/x-custom-data", selectedTexts.join(",").toUtf8());
+    mimeData->setData("application/x-custom-data", selectedTexts.join("|").toUtf8());
     drag->setMimeData(mimeData);
     QPixmap pixmap(100, 50);
     pixmap.fill(Qt::lightGray);
     QPainter painter(&pixmap);
     painter.drawText(pixmap.rect(), Qt::AlignCenter, QString("%1 ITEM").arg(selectedTexts.count()));
     drag->setPixmap(pixmap);
-    drag->exec(supportedActions);
+    drag->exec(Qt::CopyAction | Qt::MoveAction);
+}
+
+void CustomTableWidget::mousePressEvent(QMouseEvent* event)
+{
+    QTableWidget::mousePressEvent(event);
+    if (event->button() == Qt::LeftButton) {
+        startPos_ = event->pos();
+    }
 }