fix: improve taskbar title display with smooth truncation

panels/dock/taskmanager/package/AppItemTitle.qml

@@ -1,9 +1,10 @@
-// SPDX-FileCopyrightText: 2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2025-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 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.ellipsisWidth > 0
+            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

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2025-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -13,11 +13,6 @@ namespace dock
 {
 Q_LOGGING_CATEGORY(textCalculatorLog, "ds.taskmanager.textcalculator");
 
-static bool isValidElidedText(const QString &text)
-{
-    return !text.isEmpty() && text != "…";
-}
-
 TextCalculator::TextCalculator(QObject *parent)
     : QObject(parent)
     , m_optimalSingleTextWidth(0.0)
@@ -196,11 +191,19 @@ qreal TextCalculator::calculateElidedTextWidth(const QString &text, qreal maxWid
     }
 
     QFontMetricsF fontMetrics(m_font);
-    QString elidedText = fontMetrics.elidedText(text, Qt::ElideRight, maxWidth);
-    if (!isValidElidedText(elidedText))
+    QString visibleText = text;
+
+    while (!visibleText.isEmpty() &&
+        fontMetrics.horizontalAdvance(visibleText) > maxWidth)
+    {
+        visibleText.chop(1);
+    }
+
+    if (visibleText.isEmpty()) {
         return 0.0;
+    }
 
-    return fontMetrics.horizontalAdvance(elidedText);
+    return fontMetrics.horizontalAdvance(visibleText);
 }
 
 QStringList TextCalculator::getApplicationTitles() const
@@ -258,8 +261,8 @@ 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);
 
@@ -401,19 +404,36 @@ void TextCalculatorAttached::updateElidedText()
     if (!m_calculator) {
         qCDebug(textCalculatorLog) << "No calculator available for elided text update";
         m_elidedText.clear();
+        m_ellipsisWidth = 0.0;
         emit elidedTextChanged();
+        emit ellipsisWidthChanged();
         return;
     }
 
     QFontMetricsF fontMetrics(m_calculator->font());
     qreal maxWidth = m_calculator->optimalSingleTextWidth();
+    QString visibleText = m_text;
+
+    while (!visibleText.isEmpty() &&
+        fontMetrics.horizontalAdvance(visibleText) > maxWidth)
+    {
+        visibleText.chop(1);
+    }
 
-    QString newElidedText = fontMetrics.elidedText(m_text, Qt::ElideRight, maxWidth);
-    if (!isValidElidedText(newElidedText)) {
-        newElidedText = {};
+    if (visibleText.isEmpty()) {
+        visibleText = {};
     }
-    if (m_elidedText != newElidedText) {
-        m_elidedText = newElidedText;
+
+    if (visibleText != m_text) {
+        m_ellipsisWidth = fontMetrics.horizontalAdvance(QString::fromUtf8("…"));
+        emit ellipsisWidthChanged();
+    } else {
+        m_ellipsisWidth = 0.0;
+        emit ellipsisWidthChanged();
+    }
+
+    if (m_elidedText != visibleText) {
+        m_elidedText = visibleText;
         emit elidedTextChanged();
     }
 }

panels/dock/taskmanager/textcalculator.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2025 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2025-2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -17,6 +17,7 @@
     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(TextCalculator *calculator READ calculator NOTIFY calculatorChanged)
 
 public:
@@ -34,19 +35,26 @@
 
     QString elidedText() const;
 
+    qreal ellipsisWidth() const
+    {
+        return m_ellipsisWidth;
+    }
+
     void ensureInitialize();
 
 Q_SIGNALS:
     void textChanged();
     void elidedTextChanged();
+    void ellipsisWidthChanged();
     void calculatorChanged();
 
 private Q_SLOTS:
     void updateElidedText();
 
 private:
     QString m_text;
     QString m_elidedText;
+    qreal m_ellipsisWidth = 0.0;
     TextCalculator *m_calculator;
     bool m_initialized = false;
 };