From dca702f558ac454ed087dc9b695fa4dcd1f3eda9 Mon Sep 17 00:00:00 2001
From: Harrison <Harrison@fanruan.com>
Date: Mon, 7 Nov 2022 09:28:46 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20REPORT-82928=E3=80=90=E8=A7=86=E8=A7=89?=
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---
 .../startup/ui/StartupPageWorkspacePanel.java | 44 ++++++++++++++++++-
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/designer-base/src/main/java/com/fr/startup/ui/StartupPageWorkspacePanel.java b/designer-base/src/main/java/com/fr/startup/ui/StartupPageWorkspacePanel.java
index ced2aa3767..923a12292c 100644
--- a/designer-base/src/main/java/com/fr/startup/ui/StartupPageWorkspacePanel.java
+++ b/designer-base/src/main/java/com/fr/startup/ui/StartupPageWorkspacePanel.java
@@ -4,6 +4,7 @@ import com.fr.base.svg.IconUtils;
 import com.fr.design.components.tooltip.ModernToolTip;
 import com.fr.design.gui.icontainer.UIScrollPane;
 import com.fr.design.gui.ilable.UILabel;
+import com.fr.design.gui.itextfield.FRGraphics2D;
 import com.fr.design.i18n.Toolkit;
 import com.fr.design.layout.FRGUIPaneFactory;
 import com.fr.design.utils.ColorUtils;
@@ -17,6 +18,8 @@ import javax.swing.Icon;
 import javax.swing.JComponent;
 import javax.swing.JPanel;
 import javax.swing.JToolTip;
+import javax.swing.JViewport;
+import javax.swing.RepaintManager;
 import javax.swing.ScrollPaneConstants;
 import javax.swing.border.EmptyBorder;
 import java.awt.BasicStroke;
@@ -28,9 +31,11 @@ import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.GridLayout;
+import java.awt.Image;
 import java.awt.RenderingHints;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
+import java.awt.image.ImageObserver;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
 
@@ -127,9 +132,15 @@ public class StartupPageWorkspacePanel extends JPanel {
         this.contentPanel = generateUnLimitContentPanel(this.partitions);
         this.add(contentPanel, BorderLayout.NORTH);
     }
-    
     private JComponent generateUnLimitContentPanel(List<List<StartupWorkspaceBean>> partitions) {
     
+        JComponent panel = generateUnLimitContentPanel0(partitions);
+        ColorUtils.transparentBackground(panel);
+        return panel;
+    }
+    
+    private JComponent generateUnLimitContentPanel0(List<List<StartupWorkspaceBean>> partitions) {
+    
         JPanel workspaceDescWrapper = new JPanel();
         workspaceDescWrapper.setLayout(new BorderLayout(0, 0));
         workspaceDescWrapper.setBorder(new EmptyBorder(0, 0, 0, 0));
@@ -144,14 +155,20 @@ public class StartupPageWorkspacePanel extends JPanel {
         if (needScroll) {
             // 滚动条
             UIScrollPane scrollPane = new UIScrollPane(workspaceDescPanel, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
+            JViewport viewport = scrollPane.getViewport();
+            JViewport scrollViewport = new TransparentScrollViewPort();
+            // 动态画图
+            scrollViewport.addChangeListener(e -> repaintAll());
+            scrollViewport.setView(viewport.getView());
+            scrollPane.setViewport(scrollViewport);
             scrollPane.setBorder(new EmptyBorder(10, 0, 0, 0));
             scrollPane.setPreferredSize(new Dimension(CONTENT_WIDTH, SCROLL_HEIGHT));
             workspaceDescWrapper.add(scrollPane, BorderLayout.CENTER);
+            
             return workspaceDescWrapper;
         }
         workspaceDescWrapper.add(workspaceDescPanel, BorderLayout.CENTER);
         
-        ColorUtils.transparentBackground(workspaceDescWrapper);
         return workspaceDescWrapper;
     }
     
@@ -580,4 +597,27 @@ public class StartupPageWorkspacePanel extends JPanel {
         
         this.getRootPane().repaint();
     }
+    
+    /**
+     * 支持透明的滚动视图
+     */
+    private class TransparentScrollViewPort extends JViewport {
+    
+        /**
+         * 从而屏蔽掉 {@link RepaintManager.PaintManager#paintDoubleBuffered(JComponent, Image, Graphics, int, int, int, int)}
+         *
+         * @return 创建一个不会实际画图的 Graphics
+         */
+        @Override
+        public Graphics getGraphics() {
+        
+            Graphics graphics = super.getGraphics();
+            return new FRGraphics2D((Graphics2D) graphics) {
+                @Override
+                public boolean drawImage(Image img, int x, int y, ImageObserver observer) {
+                    return true;
+                }
+            };
+        }
+    }
 }