Create tool_bar.py

DataAnnotation/labelme/labelme/widgets/tool_bar.py

+from qtpy import QtCore
+from qtpy import QtWidgets
+
+
+class ToolBar(QtWidgets.QToolBar):
+
+    def __init__(self, title):
+        super(ToolBar, self).__init__(title)
+        layout = self.layout()
+        m = (0, 0, 0, 0)
+        layout.setSpacing(0)
+        layout.setContentsMargins(*m)
+        self.setContentsMargins(*m)
+        self.setWindowFlags(self.windowFlags() | QtCore.Qt.FramelessWindowHint)
+
+    def addAction(self, action):
+        if isinstance(action, QtWidgets.QWidgetAction):
+            return super(ToolBar, self).addAction(action)
+        btn = ToolButton()
+        btn.setDefaultAction(action)
+        btn.setToolButtonStyle(self.toolButtonStyle())
+        self.addWidget(btn)
+
+
+class ToolButton(QtWidgets.QToolButton):
+
+    """ToolBar companion class which ensures all buttons have the same size."""
+
+    minSize = (60, 60)
+
+    def minimumSizeHint(self):
+        ms = super(ToolButton, self).minimumSizeHint()
+        w1, h1 = ms.width(), ms.height()
+        w2, h2 = self.minSize
+        self.minSize = max(w1, w2), max(h1, h2)
+        return QtCore.QSize(*self.minSize)