[201_37] 页面滚动时菜单能够跟随滚动 (#2287)

Author: MoonL79

devel/201_37.md

@@ -8,6 +8,12 @@
 + 将鼠标放在图片中，查看图片上方居中位置是否出现一个横向悬浮菜单
 + 在将鼠标移入图片范围内时，仔细查看是否出现了菜单位移的现象，期望不出现
 + 测试左对齐、居中、右对齐按钮功能是否正常
++ 弹出菜单后，上下滚动页面，菜单应始终保持在图片上方
+
+## 2025/12/19 页面滚动时菜单能够跟随滚动
+
+### What
+之前页面滚动时菜单会固定在屏幕上原来的位置，不符合常理。
 
 ## 2025/12/19 修复错误的图像范围检测逻辑并删除无用函数
 

src/Plugins/Qt/QTMImagePopup.cpp

@@ -103,6 +103,19 @@ QTMImagePopup::setImageTree (tree t) {
   this->current_tree= t;
 }
 
+void
+QTMImagePopup::scrollBy (int x, int y) {
+  cached_scroll_x-= (int) (x / cached_magf);
+  cached_scroll_y-= (int) (y / cached_magf);
+}
+
+void
+QTMImagePopup::updatePosition () {
+  int pos_x, pos_y;
+  getCachedPosition (pos_x, pos_y);
+  move (pos_x, pos_y);
+}
+
 void
 QTMImagePopup::cachePosition (rectangle selr, double magf, int scroll_x,
                               int scroll_y, int canvas_x) {

src/Plugins/Qt/QTMWidget.cpp

@@ -155,6 +155,7 @@ QTMWidget::scrollContentsBy (int dx, int dy) {
   // 确保补全框也滚动到正确的位置
   tm_widget ()->scroll_completion_popup_by (dx, dy);
   tm_widget ()->scroll_math_completion_popup_by (dx, dy);
+  tm_widget ()->scroll_image_popup_by (dx, dy);
 }
 
 void

src/Plugins/Qt/qt_simple_widget.cpp

@@ -776,4 +776,14 @@ qt_simple_widget_rep::hide_image_popup () {
     imagePopUp->deleteLater ();
     imagePopUp= nullptr;
   }
+}
+
+void
+qt_simple_widget_rep::scroll_image_popup_by (SI x, SI y) {
+  if (imagePopUp) {
+    QPoint qp (x, y);
+    coord2 p= from_qpoint (qp);
+    imagePopUp->scrollBy (p.x1, p.x2);
+    imagePopUp->updatePosition ();
+  }
 }

src/Plugins/Qt/qt_simple_widget.hpp

@@ -118,6 +118,7 @@ class qt_simple_widget_rep : public qt_widget_rep {
   void show_image_popup (tree current_tree, rectangle selr, double magf,
                          int scroll_x, int scroll_y, int canvas_x);
   void hide_image_popup ();
+  void scroll_image_popup_by (SI x, SI y);
 
   ////////////////////// backing store management