Tab角落控件位置占满

QProxyStyle/Lib/TabCornerStyle.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2021年06月23日
+@author: Irony
+@site: https://pyqt.site , https://github.com/PyQt5
+@email: 892768447@qq.com
+@file: TabCornerStyle
+@description: 
+"""
+from PyQt5.QtCore import QRect
+from PyQt5.QtWidgets import QProxyStyle, QStyle
+
+
+class TabCornerStyle(QProxyStyle):
+
+    def subElementRect(self, element, option, widget):
+        try:
+            rect = super(TabCornerStyle, self).subElementRect(element, option, widget)
+            if element == QStyle.SE_TabWidgetRightCorner and rect.isValid():
+                # 标签tab的矩形范围
+                tab_rect = self.subElementRect(QStyle.SE_TabWidgetTabBar, option, widget)
+                # 内容面板的矩形范围
+                panel_rect = self.subElementRect(QStyle.SE_TabWidgetTabPane, option, widget)
+                ext_height = 2 * self.pixelMetric(QStyle.PM_TabBarBaseHeight, option, widget)
+                # 修正过后填充的矩形范围
+                cor_rect = QRect(tab_rect.x() + tab_rect.width() + ext_height, tab_rect.y() + ext_height,
+                                 panel_rect.width() - tab_rect.width() - 2 * ext_height,
+                                 tab_rect.height() - 2 * ext_height)
+                return cor_rect
+            return rect
+        except Exception as e:
+            print(e)
+            return QRect()

QProxyStyle/README.md

@@ -2,6 +2,7 @@
 
 - 目录
   - [QTabWidget Tab文字方向](#1qtabwidget-tab文字方向)
+  - [QTabWidget 角落控件位置](#2qtabwidget-角落控件位置)
 
 ## 1、QTabWidget Tab文字方向
 [运行 TabTextDirection.py](TabTextDirection.py)
@@ -11,3 +12,14 @@
 3. `drawControl` 绘制文字
 
 ![TabTextDirection](ScreenShot/TabTextDirection.png)
+
+## 2、QTabWidget 角落控件位置
+[运行 TabCornerWidget.py](TabCornerWidget.py)
+
+1. 通过 `app.setStyle(TabCornerStyle())` 设置代理样式
+2. `setCornerWidget` 设置自定义角落控件
+
+原理是通过代理样式中对 `SE_TabWidgetRightCorner` 计算的结果进行校正,使得角落控件占满右边空白位置,
+然后再配合自定义控件中使用 `QSpacerItem` 占据右边位置使得 + 号按钮居左,表现效果为 + 号按钮跟随标签的增加和减少
+
+![TabCornerStyle](ScreenShot/TabCornerStyle.png)

QProxyStyle/TabCornerWidget.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2021年06月23日
+@author: Irony
+@site: https://pyqt.site , https://github.com/PyQt5
+@email: 892768447@qq.com
+@file: TabCornerWidget
+@description: 
+"""
+from PyQt5.QtCore import pyqtSignal, Qt
+from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QSpacerItem, QSizePolicy, \
+    QTabWidget
+
+from QProxyStyle.Lib.TabCornerStyle import TabCornerStyle
+
+
+class TabCornerWidget(QWidget):
+    signalTabAdd = pyqtSignal()
+
+    def __init__(self, *args, **kwargs):
+        super(TabCornerWidget, self).__init__(*args, **kwargs)
+        layout = QHBoxLayout(self)
+        layout.setContentsMargins(0, 0, 0, 0)
+        self.buttonAdd = QPushButton('+', self, toolTip='添加新标签页', clicked=self.signalTabAdd.emit)
+        layout.addWidget(self.buttonAdd)
+        layout.addItem(QSpacerItem(40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum))
+
+    def resizeEvent(self, event):
+        super(TabCornerWidget, self).resizeEvent(event)
+        # 更新按钮高度
+        if hasattr(self, 'buttonAdd'):
+            self.buttonAdd.setFixedSize(self.height(), self.height())
+
+
+if __name__ == '__main__':
+    import sys
+
+    app = QApplication(sys.argv)
+    app.setStyle(TabCornerStyle())
+
+    tab1 = QTabWidget()
+    cor1 = TabCornerWidget(tab1)
+    cor1.signalTabAdd.connect(lambda: tab1.addTab(QWidget(tab1), 'tab' + str(tab1.count() + 1)))
+    tab1.setCornerWidget(cor1, Qt.TopRightCorner)
+    tab1.show()
+
+    tab2 = QTabWidget()
+    tab2.setTabPosition(QTabWidget.South)  # tab 标签方向
+    cor2 = TabCornerWidget(tab2)
+    cor2.signalTabAdd.connect(lambda: tab2.addTab(QWidget(tab2), 'tab' + str(tab2.count() + 1)))
+    tab2.setCornerWidget(cor2, Qt.BottomRightCorner)
+    tab2.show()
+
+    for i in range(10):
+        tab1.addTab(QWidget(tab1), 'tab' + str(i + 1))
+        tab2.addTab(QWidget(tab1), 'tab' + str(i + 1))
+
+    sys.exit(app.exec_())

README.md

@@ -222,6 +222,7 @@ https://pyqt.site 论坛是专门针对PyQt5学习和提升开设的网站，分
     - [串口调试小助手](QSerialPort/SerialDebugAssistant.py)
   - [QProxyStyle](QProxyStyle)
     - [Tab文字方向](QProxyStyle/TabTextDirection.py)
+    - [Tab角落控件位置占满](QProxyStyle/TabCornerWidget.py)
   - [QMessageBox](QMessageBox)
     - [消息对话框倒计时关闭](QMessageBox/CountDownClose.py)
     - [自定义图标等](QMessageBox/CustomColorIcon.py)