fix: improve taskbar title display with smooth truncation

panels/dock/taskmanager/package/AppItemTitle.qml

@@ -4,6 +4,7 @@
 
 import QtQuick
 import QtQuick.Controls
+import Qt5Compat.GraphicalEffects
 
 import org.deepin.ds.dock.taskmanager 1.0
 import org.deepin.dtk 1.0 as D
@@ -30,7 +31,20 @@ Item {
             color: D.DTK.themeType === D.ApplicationHelper.DarkType ? "#FFFFFF" : "#000000"            
             font: root.TextCalculator.calculator.font
             verticalAlignment: Text.AlignVCenter
-
+
+            layer.enabled: root.TextCalculator.isTruncated
+            layer.effect: OpacityMask {
+                maskSource: Rectangle {
+                    id: maskRect
+                    width: root.TextCalculator.ellipsisWidth
+                    height: titleText.height
+                    gradient: Gradient {
+                        orientation: Gradient.Horizontal
+                        GradientStop { position: 1; color: "#00FFFFFF" }
+                        GradientStop { position: 0.6; color: "#FFFFFFFF" }
+                    }
+                }
+            }
             opacity: visible ? 1.0 : 0.0
 
             Behavior on opacity {

panels/dock/taskmanager/textcalculator.cpp

@@ -258,8 +258,8 @@ void TextCalculator::calculateOptimalTextWidth()
     qreal newTotalWidth = 0.0;
     int charCount = 7; // Maximum character count limit
 
-    // Iterate from 7 characters to 1 character, finding the optimal solution
-    for (; charCount >= 1; --charCount) {
+    // Iterate from 7 characters to 2 characters, finding the optimal solution
+    for (; charCount >= 2; --charCount) {
         // 1. Calculate baseline width (based on character count)
         qreal baselineWidth = calculateBaselineWidth(charCount);
 
@@ -401,7 +401,11 @@ void TextCalculatorAttached::updateElidedText()
     if (!m_calculator) {
         qCDebug(textCalculatorLog) << "No calculator available for elided text update";
         m_elidedText.clear();
+        m_ellipsisWidth = 0.0;
+        m_isTruncated = false;
         emit elidedTextChanged();
+        emit ellipsisWidthChanged();
+        emit isTruncatedChanged();
         return;
     }
 
@@ -411,7 +415,17 @@ void TextCalculatorAttached::updateElidedText()
     QString newElidedText = fontMetrics.elidedText(m_text, Qt::ElideRight, maxWidth);
     if (!isValidElidedText(newElidedText)) {
         newElidedText = {};
+    } else {
+        m_isTruncated = (m_text != newElidedText);
+        emit isTruncatedChanged();
+        newElidedText.replace(QString::fromUtf8("…"), "");
+    }
+
+    if (m_isTruncated) {
+        m_ellipsisWidth = fontMetrics.horizontalAdvance(QString::fromUtf8("…"));
+        emit ellipsisWidthChanged();
     }
+
     if (m_elidedText != newElidedText) {
         m_elidedText = newElidedText;
         emit elidedTextChanged();

panels/dock/taskmanager/textcalculator.h

@@ -17,6 +17,8 @@
     QML_ELEMENT
     Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged)
     Q_PROPERTY(QString elidedText READ elidedText NOTIFY elidedTextChanged)
+    Q_PROPERTY(qreal ellipsisWidth READ ellipsisWidth NOTIFY ellipsisWidthChanged)
+    Q_PROPERTY(bool isTruncated READ isTruncated NOTIFY isTruncatedChanged)
     Q_PROPERTY(TextCalculator *calculator READ calculator NOTIFY calculatorChanged)
 
 public:
@@ -34,19 +36,33 @@
 
     QString elidedText() const;
 
+    qreal ellipsisWidth() const
+    {
+        return m_ellipsisWidth;
+    }
+
+    bool isTruncated() const
+    {
+        return m_isTruncated;
+    }
+
     void ensureInitialize();
 
 Q_SIGNALS:
     void textChanged();
     void elidedTextChanged();
+    void ellipsisWidthChanged();
+    void isTruncatedChanged();
     void calculatorChanged();
 
 private Q_SLOTS:
     void updateElidedText();
 
 private:
     QString m_text;
     QString m_elidedText;
+    qreal m_ellipsisWidth = 0.0;
+    bool m_isTruncated = false;
     TextCalculator *m_calculator;
     bool m_initialized = false;
 };