python - PySide:即时工具提示(显示工具提示之前没有延迟)

Question

我正在构建的工具使用工具提示在您单击文件之前显示有关文件的额外信息。如果有人能够提供一些关于如何实现这一目标的见解，那就太好了。我使用 PySide 大约一个月了，所以我无法破译我在网上找到的这些高级示例/答案，因此带有一些注释的简单代码示例将对我有很大帮助。

这是我到目前为止所拥有的。我不知道在事件方面我在做什么，所以这是我可以用我拥有的代码示例做的最好的事情:

from PySide import QtCore, QtGui
from shiboken import wrapInstance
import maya.OpenMayaUI as mui

def get_parent():
    ptr = mui.MQtUtil.mainWindow()
    return wrapInstance( long( ptr ), QtGui.QWidget )   

############################################        
''' Classes '''
############################################
class Main_Window( QtGui.QDialog ):
    def __init__( self, parent=get_parent() ):
        super( Main_Window, self ).__init__( parent )

        self.setMouseTracking(True)                                      # Set tracking

        self.create_gui()
        self.create_layout()
        self.create_connections()
        self.get_contents()
        self.shapeItems = []


    #--------------------------------------------------------------------  # Mouse things
    def mouseMoveEvent(self, event):
        if (event.buttons() & QtCore.Qt.LeftButton):
            self.moveItemTo(event.pos())  

    #--------------------------------------------------------------------  # Mouse things
    def event(self, event):
        if event.type() == QtCore.QEvent.ToolTip:
            helpEvent = event
            index = self.itemAt(helpEvent.pos())
            if index != -1:
                QtGui.QToolTip.showText(helpEvent.globalPos(), self.shapeItems[index].toolTip())
            else:
                QtGui.QToolTip.hideText()
                event.ignore()

            return True

        return super(Main_Window, self).event(event)

    #--------------------------------------------------------------------
    def create_gui( self ):
        self.tv_model=MyModel()
        self.tv_file_list = File_List( self )

    #--------------------------------------------------------------------
    def create_layout( self ):
        self.main_layout = QtGui.QVBoxLayout( self )
        self.main_layout.addWidget( self.tv_file_list )
        self.setLayout( self.main_layout )

    #--------------------------------------------------------------------
    def get_contents(self):
        self.tv_model.clear()
        self.tv_model.setHorizontalHeaderLabels(["name","date"])
        contents=["path1","path2"]
        for path in contents:
            date = self.get_date(path)
            self.add_file(path,date)
        self.tv_file_list.setColumnWidth(0, 150)

    #--------------------------------------------------------------------
    def add_file(self, name, date):
        name = QtGui.QStandardItem(name)
        name.setToolTip(name.text())
        name.setIcon(self.style().standardIcon(QtGui.QStyle.SP_DirOpenIcon))
        date = QtGui.QStandardItem(date)
        self.tv_model.appendRow([name, date])

    #--------------------------------------------------------------------
    def get_date(self, path):
        return "a date"

    #--------------------------------------------------------------------
    def create_connections( self ):
        self.tv_file_list.clicked.connect( self.on_click )

    # slots --------------------------------------------------------------
    def on_click(self, item ):
        index = self.tv_file_list.selectedIndexes()[0]
        item = self.tv_model.itemFromIndex(index).text()
        print item

############################################
class MyModel(QtGui.QStandardItemModel):
    def __init__(self, parent=None):
        super(MyModel, self).__init__(parent)

    #--------------------------------------------------------------------
    def flags(self, index):
        flag = QtCore.Qt.ItemIsEnabled
        if index.isValid():
            flag |= QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsUserCheckable 
        return flag

############################################
class File_List( QtGui.QTreeView ):
    ''' Create the file filters '''
    def __init__( self, mainUIWindow, parent=get_parent() ):
        super( File_List, self ).__init__( parent )

        self.setModel(mainUIWindow.tv_model)
        self.setIndentation(0)
        self.setColumnWidth(0,500)
        self.setFocusPolicy(QtCore.Qt.NoFocus)
        self.setStyleSheet("QToolTip { color: rgb(170,170,170); background-color: rgb(20,20,20); border: 1px rgb(20,20,20); }")


############################################
if __name__ == "__main__":
    # workaround for a bug in maya
    try:
        tree_view_ui.close()
        tree_view_ui.deleteLater()
    except:
        pass

    tree_view_ui = Main_Window()
    tree_view_ui.show()

    try:
        tree_view_ui.show()
    except:
        tree_view_ui.close()
        tree_view_ui.deleteLater()

HERE是一篇描述如何创建即时工具提示的帖子，但没有任何代码示例，我不知道如何编写它。该文档也没有多大帮助(它确实应该为初学者提供简单的示例)。

HERE是一段代码，显示如何实现鼠标移动事件，但我无法让它在上面我自己的示例中工作。我不断收到这样的错误:“TypeError: super(type, obj): obj 必须是 type 的实例或子类型”和“AttributeError: 'Main_Window' 对象没有属性 'itemAt'”

再说一遍，任何帮助或想法都会很棒。谢谢

解决方案

from PySide import QtCore, QtGui
from shiboken import wrapInstance
import maya.OpenMayaUI as mui

def get_parent():
    ptr = mui.MQtUtil.mainWindow()
    return wrapInstance( long( ptr ), QtGui.QWidget )   

############################################        
''' Classes '''
############################################
class Main_Window( QtGui.QDialog ):
    def __init__( self, parent=get_parent() ):
        super( Main_Window, self ).__init__( parent )

        self.create_gui()
        self.create_layout()
        self.create_connections()
        self.get_contents()

    #--------------------------------------------------------------------
    def create_gui( self ):
        self.tv_model=MyModel()
        self.tv_file_list = File_List( self )
        self.tv_file_list.setMouseTracking(True)                 # Set mouse tracking

    #--------------------------------------------------------------------
    def create_layout( self ):
        self.main_layout = QtGui.QVBoxLayout( self )
        self.main_layout.addWidget( self.tv_file_list )
        self.setLayout( self.main_layout )

    #--------------------------------------------------------------------
    def get_contents(self):
        self.tv_model.clear()
        self.tv_model.setHorizontalHeaderLabels(["name","date"])
        contents=["path1","path2"]
        for path in contents:
            date = self.get_date(path)
            self.add_file(path,date)
        self.tv_file_list.setColumnWidth(0, 150)

    #--------------------------------------------------------------------
    def add_file(self, name, date):
        name = QtGui.QStandardItem(name)
        user = "me"
        name.setToolTip("<b>{0}</b><br><b>{1}</b>".format(name.text(), user) ) # Here's where I set the tooltip
        name.setIcon(self.style().standardIcon(QtGui.QStyle.SP_DirOpenIcon))
        date = QtGui.QStandardItem(date)
        self.tv_model.appendRow([name, date])


    #--------------------------------------------------------------------
    def get_date(self, path):
        return "a date"


    #--------------------------------------------------------------------
    def create_connections( self ):
        self.tv_file_list.clicked.connect( self.on_click )
        self.tv_file_list.entered.connect( self.handleItemEntered )  # New connection

    # slots --------------------------------------------------------------
    def on_click(self, item ):
        index = self.tv_file_list.selectedIndexes()[0]
        item = self.tv_model.itemFromIndex(index).text()
        print item

    #--------------------------------------------------------------------
    def handleItemEntered(self, index):                                        # New slot
        if index.isValid():
            QtGui.QToolTip.showText(
                QtGui.QCursor.pos(),
                index.data(),
                self.tv_file_list.viewport(),
                self.tv_file_list.visualRect(index)
                )


############################################
class MyModel(QtGui.QStandardItemModel):
    def __init__(self, parent=None):
        super(MyModel, self).__init__(parent)

    def flags(self, index):
        flag = QtCore.Qt.ItemIsEnabled
        if index.isValid():
            flag |= QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsUserCheckable 
        return flag

############################################
class File_List( QtGui.QTreeView ):
    ''' Create the file filters '''
    def __init__( self, mainUIWindow, parent=get_parent() ):
        super( File_List, self ).__init__( parent )

        self.setModel(mainUIWindow.tv_model)
        self.setIndentation(0)
        self.setColumnWidth(0,500)
        self.setFocusPolicy(QtCore.Qt.NoFocus)
        self.setStyleSheet("QToolTip { color: rgb(170,170,170); background-color: rgb(20,20,20); border: 1px rgb(20,20,20); }")


############################################
if __name__ == "__main__":
    # workaround for a bug in maya
    try:
        tree_view_ui.close()
        tree_view_ui.deleteLater()
    except:
        pass

    tree_view_ui = Main_Window()
    tree_view_ui.show()

    try:
        tree_view_ui.show()
    except:
        tree_view_ui.close()
        tree_view_ui.deleteLater()

Answer 1

使用 TreeView 的 entered 可以更容易地做到这一点信号。如果您使用 showText 的重载需要一个 rect 参数，QToolTip 将自动完成剩下的工作。

这是一个简单的演示:

from PySide import QtCore, QtGui

class Window(QtGui.QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.view = QtGui.QTreeView(self)
        self.view.setMouseTracking(True)
        self.view.entered.connect(self.handleItemEntered)
        model = QtGui.QStandardItemModel(self)
        for text in 'One Two Three Four Five'.split():
            model.appendRow(QtGui.QStandardItem(text))
        self.view.setModel(model)
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.view)

    def handleItemEntered(self, index):
        if index.isValid():
            QtGui.QToolTip.showText(
                QtGui.QCursor.pos(),
                index.data(),
                self.view.viewport(),
                self.view.visualRect(index)
                )

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.setGeometry(500, 300, 200, 200)
    window.show()
    sys.exit(app.exec_())