refactor: 优化dde-dock内存

1. PreviewContainer改为非静态对象，并使用后进行销毁
2. AppSnapshot调整获取截图逻辑，优先使用kwin的接口，如无法获取再使用共享内存或X的方式

Log: 优化了dde-dock的内存
Influence: 优化内存，无功能性影响
Task: https://pms.uniontech.com/zentao/task-view-92574.html
Change-Id: I709a28d40214df97596ed52c1863018b271979bb

frame/item/appitem.cpp

@@ -24,7 +24,6 @@
 #include "themeappicon.h"
 #include "xcb_misc.h"
 #include "appswingeffectbuilder.h"
-#include "appspreviewprovider.h"
 #include "utils.h"
 
 #include <X11/X.h>
@@ -333,7 +332,7 @@ void AppItem::mouseReleaseEvent(QMouseEvent *e)
         m_itemEntryInter->Activate(QX11Info::getTimestamp());
 
         // play launch effect
-        if (m_windowInfos.isEmpty() && DGuiApplicationHelper::isSpecialEffectsEnvironment())  
+        if (m_windowInfos.isEmpty() && DGuiApplicationHelper::isSpecialEffectsEnvironment())
             playSwingEffect();
     }
 }
@@ -640,7 +639,10 @@ void AppItem::onRefreshIcon()
 
 void AppItem::onResetPreview()
 {
-    m_appPreviewTips = nullptr;
+    if (m_appPreviewTips != nullptr) {
+        m_appPreviewTips->deleteLater();
+        m_appPreviewTips = nullptr;
+    }
 }
 
 void AppItem::activeChanged()
@@ -653,7 +655,11 @@ void AppItem::showPreview()
     if (m_windowInfos.isEmpty())
         return;
 
-    m_appPreviewTips = PreviewWindow(m_windowInfos, m_itemEntryInter->GetAllowedCloseWindows().value(), DockPosition);
+    m_appPreviewTips = new PreviewContainer;
+
+    m_appPreviewTips->setWindowInfos(m_windowInfos, m_itemEntryInter->GetAllowedCloseWindows().value());
+    m_appPreviewTips->updateSnapshots();
+    m_appPreviewTips->updateLayoutDirection(DockPosition);
 
     connect(m_appPreviewTips, &PreviewContainer::requestActivateWindow, this, &AppItem::requestActivateWindow, Qt::QueuedConnection);
     connect(m_appPreviewTips, &PreviewContainer::requestPreviewWindow, this, &AppItem::requestPreviewWindow, Qt::QueuedConnection);

frame/item/components/appsnapshot.cpp

@@ -206,8 +206,8 @@ void AppSnapshot::fetchSnapshot()
     uchar *image_data = nullptr;
     XImage *ximage = nullptr;
 
-    // wayland环境下，使用KWin提供的接口
-    if (isKWinAvailable() && Utils::IS_WAYLAND_DISPLAY) {
+    // 优先使用窗管进行窗口截图
+    if (isKWinAvailable()) {
         QDBusInterface interface(QStringLiteral("org.kde.KWin"), QStringLiteral("/Screenshot"), QStringLiteral("org.kde.kwin.Screenshot"));
         qDebug() << "windowsID:"<< m_wid;
 
@@ -244,6 +244,7 @@ void AppSnapshot::fetchSnapshot()
                 // get window image from XGetImage(a little slow)
                 qDebug() << "get Image from dxcbplugin SHM failed!";
                 qDebug() << "get Image from Xlib...";
+                // guoyao note：这里会造成内存泄漏，而且是通过demo在X环境经过验证，改用xcb库同样会有内存泄漏，这里暂时未找到解决方案，所以优先使用kwin提供的接口
                 ximage = getImageXlib();
                 if (!ximage) {
                     qDebug() << "get Image from Xlib failed! giving up...";
@@ -342,13 +343,6 @@ void AppSnapshot::paintEvent(QPaintEvent *e)
     painter.drawRoundedRect(m_snapshotSrcRect, radius * ratio, radius * ratio);
 }
 
-void AppSnapshot::resizeEvent(QResizeEvent *e)
-{
-    QWidget::resizeEvent(e);
-
-    QTimer::singleShot(1, this, &AppSnapshot::fetchSnapshot);
-}
-
 void AppSnapshot::mousePressEvent(QMouseEvent *e)
 {
     QWidget::mousePressEvent(e);

frame/item/components/appsnapshot.h

@@ -96,7 +96,6 @@ private:
     void enterEvent(QEvent *e) override;
     void leaveEvent(QEvent *e) override;
     void paintEvent(QPaintEvent *e) override;
-    void resizeEvent(QResizeEvent *e) override;
     void mousePressEvent(QMouseEvent *e) override;
     bool eventFilter(QObject *watched, QEvent *e) override;
     SHMInfo *getImageDSHM();

frame/item/components/appspreviewprovider.h

@@ -1,22 +0,0 @@
-
-#ifndef APPSPREVIEWPROVIDER_H
-#define APPSPREVIEWPROVIDER_H
-
-#include "previewcontainer.h"
-
-static PreviewContainer *PreviewWindow(const WindowInfoMap &infos, const WindowList &allowClose, const Dock::Position dockPos)
-{
-    static PreviewContainer *preview;
-    if (!preview) {
-        preview = new PreviewContainer;
-    }
-
-    preview->disconnect();
-    preview->setWindowInfos(infos, allowClose);
-    preview->updateSnapshots();
-    preview->updateLayoutDirection(dockPos);
-
-    return preview;
-}
-
-#endif /* APPSPREVIEWPROVIDER_H */

tests/item/components/ut_previewcontainer.cpp

@@ -26,7 +26,6 @@
 #include <gtest/gtest.h>
 
 #include "previewcontainer.h"
-#include "appspreviewprovider.h"
 
 class Test_PreviewContainer : public ::testing::Test
 {};
@@ -150,13 +149,3 @@ TEST_F(Test_PreviewContainer, event_test)
     data->deleteLater();
     ASSERT_TRUE(true);
 }
-
-TEST_F(Test_PreviewContainer, PreviewWindow)
-{
-    WindowList list;
-    PreviewContainer *preview = PreviewWindow(WindowInfoMap(), list, Dock::Position::Top);
-
-    ASSERT_TRUE(preview);
-
-    delete preview;
-}