Fix: Adjust the close button and the calculation method of text display.

Because the distance between the text and the button is not fixed, it will overlap when the adjustment is adjusted to the critical state. Adjust the calculation method to ensure that text and buttons do not overlap.

log: Adjust the close button and the calculation method of text display
     Guarantee text in the middle

Bug: https://pms.uniontech.com/bug-view-298489.html

src/plugins/filemanager/dfmplugin-titlebar/views/tab.cpp

@@ -174,13 +174,26 @@ void Tab::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidg
     int buttonMargin = (d->hovered && d->showCloseButton) ? 4 : 0;
 
     int textMargin = blueSquareWidth + blueSquareMargin;
-    int closeButtonMargin = buttonSize + buttonMargin;
-
+
     painter->setFont(font);
     QFontMetrics fm(font);
     QString tabName = d->tabAlias.isEmpty() ? d->tabText : d->tabAlias;
+
+    // 1. 计算文本宽度时不考虑按钮空间，这样文本位置在hover和非hover时保持一致
     QString str = fm.elidedText(tabName, Qt::ElideRight, d->width - tabMargin - textMargin);
-    QString buttonHoveredStr = fm.elidedText(tabName, Qt::ElideRight, d->width - tabMargin - textMargin - buttonSize);
+
+    // 2. 计算文本绘制位置，保持居中
+    int textX = (d->width - fm.horizontalAdvance(str) - textMargin) / 2 + textMargin;
+
+    // 3. 如果文本会与关闭按钮重叠，重新计算文本宽度
+    if (d->hovered && d->showCloseButton) {
+        int textEndX = textX + fm.horizontalAdvance(str);
+        int buttonStartX = d->width - buttonSize - buttonMargin;
+        if (textEndX > buttonStartX) {
+            // 重新计算文本宽度，确保不重叠
+            str = fm.elidedText(tabName, Qt::ElideRight, buttonStartX - textX);
+        }
+    }
 
     DPalette pal = DPaletteHelper::instance()->palette(widget);
     QColor color;
@@ -198,16 +211,19 @@ void Tab::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidg
         painter->fillRect(boundingRect(), color);
     }
 
+    // 绘制蓝色方块
     if (isChecked()) {
         painter->save();
         QColor blueColor = pal.color(QPalette::Active, QPalette::Highlight);
         painter->setPen(Qt::NoPen);
         painter->setBrush(blueColor);
-        painter->drawRoundedRect(QRect((d->width - fm.horizontalAdvance(str) - textMargin) / 2, (d->height - blueSquareWidth) / 2, blueSquareWidth, blueSquareWidth), 1, 1);
+        painter->drawRoundedRect(QRect(textX - textMargin, 
+                                     (d->height - blueSquareWidth) / 2, 
+                                     blueSquareWidth, blueSquareWidth), 1, 1);
         painter->restore();
     }
 
-    // draw text
+    // 绘制文本
     if (isChecked()) {
         color = pal.color(QPalette::Active, QPalette::Text);
         QPen tPen = painter->pen();
@@ -219,8 +235,9 @@ void Tab::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidg
         tPen.setColor(color);
         painter->setPen(tPen);
     }
-    painter->drawText((d->width - fm.horizontalAdvance(str) - textMargin) / 2 + textMargin, (d->height - fm.height()) / 2,
-                      fm.horizontalAdvance(str), fm.height(), 0, buttonHoveredStr);
+    painter->drawText(textX, (d->height - fm.height()) / 2,
+                     fm.horizontalAdvance(str), fm.height(), 
+                     0, str);
 
     // 绘制边框线
     painter->save();
@@ -249,7 +266,10 @@ void Tab::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidg
         painter->save();
         painter->setRenderHint(QPainter::Antialiasing);
 
-        d->closeButtonRect = QRect(d->width - buttonSize - buttonMargin, (d->height - buttonSize) / 2, buttonSize, buttonSize);
+        d->closeButtonRect = QRect(d->width - buttonSize - buttonMargin, 
+                                 (d->height - buttonSize) / 2, 
+                                 buttonSize, 
+                                 buttonSize);
 
         QColor buttonColor = d->closeButtonHovered ? pal.color(QPalette::Highlight) : pal.color(QPalette::Text);
         painter->setPen(QPen(buttonColor, 1.5));