add floating preview widget

Change-Id: Ia13af9810b1aa8769b1920a4175e3dd315869627

frame/frame.pro

@@ -41,7 +41,8 @@ SOURCES += main.cpp \
     item/components/previewcontainer.cpp \
     item/components/previewwidget.cpp \
     item/components/_previewcontainer.cpp \
-    item/components/appsnapshot.cpp
+    item/components/appsnapshot.cpp \
+    item/components/floatingpreview.cpp
 
 HEADERS  += \
     window/mainwindow.h \
@@ -73,7 +74,8 @@ HEADERS  += \
     item/components/previewcontainer.h \
     item/components/previewwidget.h \
     item/components/_previewcontainer.h \
-    item/components/appsnapshot.h
+    item/components/appsnapshot.h \
+    item/components/floatingpreview.h
 
 dbus_service.files += com.deepin.dde.Dock.service
 dbus_service.path = /usr/share/dbus-1/services

frame/item/components/_previewcontainer.cpp

@@ -10,6 +10,7 @@
 _PreviewContainer::_PreviewContainer(QWidget *parent)
     : QWidget(parent),
 
+      m_floatingPreview(new FloatingPreview(this)),
       m_mouseLeaveTimer(new QTimer(this)),
       m_wmHelper(DWindowManagerHelper::instance())
 {
@@ -20,10 +21,13 @@ _PreviewContainer::_PreviewContainer(QWidget *parent)
     m_mouseLeaveTimer->setSingleShot(true);
     m_mouseLeaveTimer->setInterval(10);
 
+    m_floatingPreview->setVisible(false);
+
     setLayout(m_windowListLayout);
     setFixedSize(SNAP_WIDTH, SNAP_HEIGHT);
 
     connect(m_mouseLeaveTimer, &QTimer::timeout, this, &_PreviewContainer::checkMouseLeave, Qt::QueuedConnection);
+    connect(m_floatingPreview, &FloatingPreview::requestMove, this, &_PreviewContainer::moveFloatingPreview);
 }
 
 void _PreviewContainer::setWindowInfos(const WindowDict &infos)
@@ -62,8 +66,12 @@ void _PreviewContainer::updateLayoutDirection(const Dock::Position dockPos)
 
 void _PreviewContainer::checkMouseLeave()
 {
-    if (!underMouse())
+    const bool hover = underMouse();
+
+    if (!hover)
     {
+        m_floatingPreview->setVisible(false);
+
         emit requestCancelPreview();
         emit requestHidePreview();
     }
@@ -103,7 +111,7 @@ void _PreviewContainer::appendSnapWidget(const WId wid)
     connect(snap, &AppSnapshot::clicked, this, &_PreviewContainer::requestActivateWindow, Qt::QueuedConnection);
     connect(snap, &AppSnapshot::clicked, this, &_PreviewContainer::requestCancelPreview);
     connect(snap, &AppSnapshot::clicked, this, &_PreviewContainer::requestHidePreview);
-    connect(snap, &AppSnapshot::entered, this, &_PreviewContainer::requestPreviewWindow);
+    connect(snap, &AppSnapshot::entered, this, &_PreviewContainer::previewEntered);
 
     m_windowListLayout->addWidget(snap);
 
@@ -123,3 +131,26 @@ void _PreviewContainer::leaveEvent(QEvent *e)
 
     m_mouseLeaveTimer->start();
 }
+
+void _PreviewContainer::previewEntered(const WId wid)
+{
+    AppSnapshot *snap = static_cast<AppSnapshot *>(sender());
+
+    m_floatingPreview->trackWindow(snap);
+    m_floatingPreview->setVisible(true);
+    m_floatingPreview->raise();
+
+    emit requestPreviewWindow(wid);
+}
+
+void _PreviewContainer::moveFloatingPreview(const QPoint &p)
+{
+    const QRect r = rect();
+
+    if (p.x() < r.left())
+        m_floatingPreview->move(MARGIN, p.y());
+    else if (p.x() + m_floatingPreview->width() > r.right())
+        m_floatingPreview->move(r.right() - m_floatingPreview->width() - MARGIN + 1, p.y());
+    else
+        m_floatingPreview->move(p);
+}

frame/item/components/_previewcontainer.h

@@ -8,6 +8,7 @@
 #include "dbus/dbusdockentry.h"
 #include "constants.h"
 #include "appsnapshot.h"
+#include "floatingpreview.h"
 
 #include <DWindowManagerHelper>
 
@@ -43,9 +44,14 @@ private:
     void enterEvent(QEvent *e);
     void leaveEvent(QEvent *e);
 
+private slots:
+    void previewEntered(const WId wid);
+    void moveFloatingPreview(const QPoint &p);
+
 private:
     QMap<WId, AppSnapshot *> m_snapshots;
 
+    FloatingPreview *m_floatingPreview;
     QBoxLayout *m_windowListLayout;
 
     QTimer *m_mouseLeaveTimer;

frame/item/components/floatingpreview.cpp

@@ -0,0 +1,46 @@
+#include "floatingpreview.h"
+#include "appsnapshot.h"
+#include "_previewcontainer.h"
+
+#include <QPainter>
+#include <QVBoxLayout>
+
+FloatingPreview::FloatingPreview(QWidget *parent)
+    : QWidget(parent),
+
+      m_closeBtn(new DImageButton)
+{
+    m_closeBtn->setFixedSize(24, 24);
+    m_closeBtn->setNormalPic(":/icons/resources/close_round_normal.png");
+    m_closeBtn->setHoverPic(":/icons/resources/close_round_hover.png");
+    m_closeBtn->setPressPic(":/icons/resources/close_round_press.png");
+
+    QVBoxLayout *centralLayout = new QVBoxLayout;
+    centralLayout->addWidget(m_closeBtn);
+    centralLayout->setAlignment(m_closeBtn, Qt::AlignRight | Qt::AlignTop);
+    centralLayout->setMargin(0);
+    centralLayout->setSpacing(0);
+
+    setLayout(centralLayout);
+    setFixedSize(SNAP_WIDTH, SNAP_HEIGHT);
+}
+
+void FloatingPreview::trackWindow(AppSnapshot * const snap)
+{
+    m_tracked = snap;
+
+    const QRect r = rect();
+    const QRect sr = snap->geometry();
+    const QPoint offset = sr.center() - r.center();
+
+    emit requestMove(offset);
+}
+
+void FloatingPreview::paintEvent(QPaintEvent *e)
+{
+    QWidget::paintEvent(e);
+
+    QPainter painter(this);
+
+    painter.fillRect(rect(), Qt::red);
+}

frame/item/components/floatingpreview.h

@@ -0,0 +1,34 @@
+#ifndef FLOATINGPREVIEW_H
+#define FLOATINGPREVIEW_H
+
+#include <QWidget>
+#include <QPointer>
+
+#include <dimagebutton.h>
+
+DWIDGET_USE_NAMESPACE
+
+class AppSnapshot;
+class FloatingPreview : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit FloatingPreview(QWidget *parent = 0);
+
+signals:
+    void requestMove(const QPoint &p) const;
+
+public slots:
+    void trackWindow(AppSnapshot * const snap);
+
+private:
+    void paintEvent(QPaintEvent *e);
+
+private:
+    QPointer<AppSnapshot> m_tracked;
+
+    DImageButton *m_closeBtn;
+};
+
+#endif // FLOATINGPREVIEW_H