REPORT-58503 【主题切换】预览区ui改版

【问题原因】
单元格样式预览显示透明块

【改动思路】
同上

designer-base/src/main/java/com/fr/design/cell/CellStylePreviewPane.java

@@ -3,13 +3,13 @@ package com.fr.design.cell;
 import com.fr.base.NameStyle;
 import com.fr.base.ScreenResolution;
 import com.fr.base.Style;
+import com.fr.general.IOUtils;
 
 import javax.swing.JPanel;
 import java.awt.Dimension;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
-import java.awt.Image;
+import java.awt.image.BufferedImage;
-import java.awt.Toolkit;
 
 /**
  * @author Starryi
@@ -18,7 +18,7 @@ import java.awt.Toolkit;
  */
 public class CellStylePreviewPane extends JPanel {
 
-    private static final Image transparentBackgroundImage = Toolkit.getDefaultToolkit().createImage(CellStylePreviewPane.class.getResource("/com/fr/design/images/transparent_background.png"));
+    private static final BufferedImage transparentBackgroundImage = IOUtils.readImage("/com/fr/design/images/transparent_background.png");
     private final float transparentBackgroundWidth;
     private final float transparentBackgroundHeight;
     private String paintText = "Report";
@@ -38,7 +38,7 @@ public class CellStylePreviewPane extends JPanel {
     }
 
     @Override
-    public void paintComponent(Graphics g) {
+    public void paint(Graphics g) {
         Graphics2D g2d = (Graphics2D) g;
         int resolution = ScreenResolution.getScreenResolution();