From c08a847a10407af95a5463a3d6a08527ee509bc1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=9F=B3=E5=8D=9A=E6=96=87?= <sbw@sbw.so>
Date: Mon, 20 Jun 2016 14:28:25 +0800
Subject: [PATCH] add drag & drop

Change-Id: Ic940c761dee0abe2b1f2ed8952ef5070fe49a30e
---
 frame/item/appitem.cpp    | 10 +++++++---
 frame/item/dockitem.h     |  3 +++
 frame/panel/mainpanel.cpp | 35 +++++++++++++++++++++++++++++++++--
 frame/panel/mainpanel.h   |  7 +++++++
 4 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/frame/item/appitem.cpp b/frame/item/appitem.cpp
index 2c9772e72..478ef4946 100644
--- a/frame/item/appitem.cpp
+++ b/frame/item/appitem.cpp
@@ -69,9 +69,11 @@ void AppItem::paintEvent(QPaintEvent *e)
 
 void AppItem::mouseReleaseEvent(QMouseEvent *e)
 {
-    // activate
-    // TODO: dbus signature changed
-    if (e->button() == Qt::LeftButton)
+    if (e->button() != Qt::LeftButton)
+        return;
+
+    const QPoint distance = MousePressPos - e->pos();
+    if (distance.manhattanLength() < APP_DRAG_THRESHOLD)
         m_itemEntry->Activate();
 }
 
@@ -129,12 +131,14 @@ void AppItem::startDrag()
     drag->setHotSpot(pixmap.rect().center());
     drag->setMimeData(new QMimeData);
 
+    emit dragStarted();
     const Qt::DropAction result = drag->exec(Qt::MoveAction);
 
     qDebug() << "dnd result: " << result;
 
     m_draging = false;
     update();
+    setVisible(true);
 }
 
 void AppItem::initClientManager()
diff --git a/frame/item/dockitem.h b/frame/item/dockitem.h
index 0d308014b..c3c5e24e7 100644
--- a/frame/item/dockitem.h
+++ b/frame/item/dockitem.h
@@ -24,6 +24,9 @@ public:
 
     ItemType itemType() const;
 
+signals:
+    void dragStarted() const;
+
 protected:
     void paintEvent(QPaintEvent *e);
     void mousePressEvent(QMouseEvent *e);
diff --git a/frame/panel/mainpanel.cpp b/frame/panel/mainpanel.cpp
index b27250460..26485eac1 100644
--- a/frame/panel/mainpanel.cpp
+++ b/frame/panel/mainpanel.cpp
@@ -3,6 +3,8 @@
 #include <QBoxLayout>
 #include <QDragEnterEvent>
 
+DockItem *MainPanel::DragingItem = nullptr;
+
 MainPanel::MainPanel(QWidget *parent)
     : QFrame(parent),
       m_itemLayout(new QBoxLayout(QBoxLayout::LeftToRight, this)),
@@ -25,7 +27,10 @@ MainPanel::MainPanel(QWidget *parent)
 
     const QList<DockItem *> itemList = m_itemController->itemList();
     for (auto item : itemList)
+    {
+        initItemConnection(item);
         m_itemLayout->addWidget(item);
+    }
 
     setLayout(m_itemLayout);
 }
@@ -52,16 +57,36 @@ void MainPanel::dragEnterEvent(QDragEnterEvent *e)
 {
     // TODO: check
     e->accept();
+
+    if (!DragingItem)
+        return;
+    DragingItem->show();
 }
 
 void MainPanel::dragMoveEvent(QDragMoveEvent *e)
 {
-    qDebug() << e;
+    Q_UNUSED(e);
+    //    qDebug() << e;
+}
+
+void MainPanel::dragLeaveEvent(QDragLeaveEvent *e)
+{
+    Q_UNUSED(e)
+
+    if (!DragingItem)
+        return;
+    DragingItem->hide();
 }
 
 void MainPanel::dropEvent(QDropEvent *e)
 {
-    qDebug() << e;
+    Q_UNUSED(e)
+//    qDebug() << e;
+}
+
+void MainPanel::initItemConnection(DockItem *item)
+{
+    connect(item, &DockItem::dragStarted, this, &MainPanel::itemDragStarted);
 }
 
 void MainPanel::adjustItemSize()
@@ -82,6 +107,7 @@ void MainPanel::adjustItemSize()
 
 void MainPanel::itemInserted(const int index, DockItem *item)
 {
+    initItemConnection(item);
     m_itemLayout->insertWidget(index, item);
 
     item->setFixedWidth(80);
@@ -93,3 +119,8 @@ void MainPanel::itemRemoved(DockItem *item)
 {
     m_itemLayout->removeWidget(item);
 }
+
+void MainPanel::itemDragStarted()
+{
+    DragingItem = qobject_cast<DockItem *>(sender());
+}
diff --git a/frame/panel/mainpanel.h b/frame/panel/mainpanel.h
index d6d78d5e4..16b889238 100644
--- a/frame/panel/mainpanel.h
+++ b/frame/panel/mainpanel.h
@@ -20,16 +20,23 @@ private:
     void resizeEvent(QResizeEvent *e);
     void dragEnterEvent(QDragEnterEvent *e);
     void dragMoveEvent(QDragMoveEvent *e);
+    void dragLeaveEvent(QDragLeaveEvent *e);
     void dropEvent(QDropEvent *e);
 
+    void initItemConnection(DockItem *item);
+
+private slots:
     void adjustItemSize();
     void itemInserted(const int index, DockItem *item);
     void itemRemoved(DockItem *item);
+    void itemDragStarted();
 
 private:
     QBoxLayout *m_itemLayout;
 
     DockItemController *m_itemController;
+
+    static DockItem *DragingItem;
 };
 
 #endif // MAINPANEL_H