diff --git a/RedPandaIDE/RedPandaIDE.pro b/RedPandaIDE/RedPandaIDE.pro
index 8439cd22..f1fecf1b 100644
--- a/RedPandaIDE/RedPandaIDE.pro
+++ b/RedPandaIDE/RedPandaIDE.pro
@@ -203,6 +203,7 @@ SOURCES += \
     widgets/custommakefileinfodialog.cpp \
     widgets/darkfusionstyle.cpp \
     widgets/editorstabwidget.cpp \
+    widgets/filenameeditdelegate.cpp \
     widgets/filepropertiesdialog.cpp \
     widgets/functiontooltipwidget.cpp \
     widgets/headercompletionpopup.cpp \
@@ -330,6 +331,7 @@ HEADERS += \
     widgets/custommakefileinfodialog.h \
     widgets/darkfusionstyle.h \
     widgets/editorstabwidget.h \
+    widgets/filenameeditdelegate.h \
     widgets/filepropertiesdialog.h \
     widgets/functiontooltipwidget.h \
     widgets/headercompletionpopup.h \
diff --git a/RedPandaIDE/mainwindow.cpp b/RedPandaIDE/mainwindow.cpp
index 401a7d63..a584bcf7 100644
--- a/RedPandaIDE/mainwindow.cpp
+++ b/RedPandaIDE/mainwindow.cpp
@@ -24,6 +24,7 @@
 #include "debugger.h"
 #include "widgets/cpudialog.h"
 #include "widgets/filepropertiesdialog.h"
+#include "widgets/filenameeditdelegate.h"
 #include "project.h"
 #include "projecttemplate.h"
 #include "widgets/newprojectdialog.h"
@@ -400,6 +401,8 @@ MainWindow::MainWindow(QWidget *parent)
     for (int i=1;i<mFileSystemModel.columnCount();i++) {
         ui->treeFiles->hideColumn(i);
     }
+    FilenameEditDelegate *filenameEditDelegate = new FilenameEditDelegate(ui->treeFiles);
+    ui->treeFiles->setItemDelegate(filenameEditDelegate);
     connect(ui->cbFilesPath->lineEdit(),&QLineEdit::returnPressed,
             this,&MainWindow::onFilesViewPathChanged);
     connect(ui->cbFilesPath, QOverload<int>::of(&QComboBox::currentIndexChanged),
diff --git a/RedPandaIDE/widgets/filenameeditdelegate.cpp b/RedPandaIDE/widgets/filenameeditdelegate.cpp
new file mode 100644
index 00000000..667e9e6c
--- /dev/null
+++ b/RedPandaIDE/widgets/filenameeditdelegate.cpp
@@ -0,0 +1,100 @@
+/* by XY0797 2024.2.21 */
+
+#include "filenameeditdelegate.h"
+#include <QLineEdit>
+#include <qapplication.h>
+
+// Custom edit box control. This is necessary because the default behavior of a QLineEdit when it gains focus is to select all its text, and if a selection is set before gaining focus, it will be overridden by the select-all action upon focusing.
+class FilenameLineEdit : public QLineEdit
+{
+public:
+    explicit FilenameLineEdit(QWidget *parent = nullptr) : QLineEdit(parent) {}
+
+    // Add a custom method to set the selection on focus gain.
+    void setFocusSelectState(int index, int length)
+    {
+        m_focusSelectionStart = index;
+        m_focusSelectionLength = length;
+    }
+
+protected:
+    int m_focusSelectionStart = -1;
+    int m_focusSelectionLength = -1;
+
+    // Override the focus-in event, resetting the selection before executing the default operation.
+    void focusInEvent(QFocusEvent *event) override
+    {
+        if (m_focusSelectionStart != -1 && m_focusSelectionLength > 0)
+        {
+            deselect();
+            setSelection(m_focusSelectionStart, m_focusSelectionLength);
+        }
+        QLineEdit::focusInEvent(event);
+    }
+};
+
+// Return the last occurrence index of '.' in the string; if not found, return the length of the string.
+int findDotPosition(const QString &fileName)
+{
+    int dotPosition = fileName.lastIndexOf('.');
+    if (dotPosition != -1)
+    {
+        return dotPosition;
+    }
+    else
+    {
+        return fileName.length();
+    }
+}
+
+// Below follows the implementation of the delegate class.
+
+FilenameEditDelegate::FilenameEditDelegate(QObject *parent) : QStyledItemDelegate(parent) {}
+
+// Use our custom component when creating the editor.
+QWidget *FilenameEditDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    FilenameLineEdit *editor = new FilenameLineEdit(parent);
+    return editor;
+}
+
+// Set the content, and if the item is a file, set the selection on focus gain to exclude the file extension.
+void FilenameEditDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
+{
+    FilenameLineEdit *lineEdit = (FilenameLineEdit *)editor;
+    if (!lineEdit) { return; }
+
+    QString fileName = index.data().toString();
+    lineEdit->setText(fileName);
+    // Determine whether the currently edited item is a directory or a file; if it's a directory, there's no need to set a selection.
+    Qt::ItemFlags flags = index.flags();
+    if (flags & Qt::ItemNeverHasChildren) {
+        lineEdit->setFocusSelectState(0, findDotPosition(fileName));
+    }
+}
+
+// Return the edited data back to the QTreeView.
+void FilenameEditDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
+{
+    FilenameLineEdit *lineEdit = (FilenameLineEdit *)editor;
+    if (!lineEdit) { return; }
+
+    model->setData(index, lineEdit->text());
+}
+
+// Override the method for updating the editor's position.
+void FilenameEditDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
+{
+    FilenameLineEdit *lineEdit = (FilenameLineEdit *)editor;
+    if (!lineEdit) { return; }
+
+    const QWidget *widget = option.widget;
+    QStyleOptionViewItem opt = option;
+    initStyleOption(&opt, index);
+    opt.showDecorationSelected = true;
+
+    QStyle *style = widget ? widget->style() : QApplication::style();
+    QRect geom = style->subElementRect(QStyle::SE_ItemViewItemText, &opt, widget);
+
+    lineEdit->setGeometry(geom);
+}
diff --git a/RedPandaIDE/widgets/filenameeditdelegate.h b/RedPandaIDE/widgets/filenameeditdelegate.h
new file mode 100644
index 00000000..c46dbf6d
--- /dev/null
+++ b/RedPandaIDE/widgets/filenameeditdelegate.h
@@ -0,0 +1,20 @@
+#ifndef FILENAMEEDITDELEGATE_H
+#define FILENAMEEDITDELEGATE_H
+
+#include <QStyledItemDelegate>
+
+class FilenameEditDelegate : public QStyledItemDelegate
+{
+    Q_OBJECT
+
+public:
+    FilenameEditDelegate(QObject *parent = nullptr);
+
+    int mIconWidth = 20;
+    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+    void setEditorData(QWidget *editor, const QModelIndex &index) const override;
+    void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const override;
+    void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
+};
+
+#endif // FILENAMEEDITDELEGATE_H
diff --git a/RedPandaIDE/xmake.lua b/RedPandaIDE/xmake.lua
index edc5c852..c9115584 100644
--- a/RedPandaIDE/xmake.lua
+++ b/RedPandaIDE/xmake.lua
@@ -91,6 +91,7 @@ target("RedPandaIDE")
         "widgets/customfilesystemmodel",
         "widgets/darkfusionstyle",
         "widgets/editorstabwidget",
+        "widgets/filenameeditdelegate",
         "widgets/functiontooltipwidget",
         "widgets/headercompletionpopup",
         "widgets/issuestable",