优化模型图元文件的预览效果

source/modelInfoEditDialog.cpp

@@ -139,7 +139,12 @@ void ModelInfoEditDialog::resetUI()
     ui->lineEdit_modelImage->setText("");
     ui->plainTextEdit_modelComment->setPlainText("");
     ui->label_error->clear();
-    ui->modelImagePreview->setPixmap(QPixmap(":/img/images/icon_file.png"));
+    ui->modelImagePreview->setPixmap(QPixmap(":/img/images/icon_file.png").scaled(
+        ui->modelImagePreview->width(),
+        ui->modelImagePreview->height(),
+        Qt::KeepAspectRatio,
+        Qt::SmoothTransformation
+        ));
 
     m_oldName = "";
     m_oldType = "";

ui/modelInfoEditDialog.ui

@@ -193,11 +193,14 @@
              </size>
             </property>
             <property name="styleSheet">
-             <string notr="true"/>
+             <string notr="true">background-color: rgb(240, 240, 240);</string>
             </property>
             <property name="text">
              <string/>
             </property>
+            <property name="alignment">
+             <set>Qt::AlignmentFlag::AlignCenter</set>
+            </property>
            </widget>
           </item>
           <item>