PySide：即时工具提示（在显示工具提示前不延迟）

Question

我正在构建的工具使用工具提示在点击它之前显示有关文件的额外信息。如果有人能够借鉴一些如何实现这一点，这将是非常好的。我大约一个月到PySide，所以我无法破译我在网上找到的这些高级示例/答案，所以一个简单的代码示例和一些评论将帮助我解决很多问题。

这是我到目前为止。我不知道，当谈到事件我在做什么，所以这是我可以用代码示例做了最好的，我有：

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是描述如何创建即时提示后，但没有任何代码示例我不知道如何写这个。文档也不是很有帮助（它确实应该有初学者的简单例子）。

HERE是一个代码，显示如何实现鼠标移动事件，但我还没有能够得到它在我自己的例子上面工作。我不断收到错误，说：“TypeError：超级（类型，obj）：obj必须是一个实例或类型的子类型”和“AttributeError：'Main_Window'对象没有属性'itemAt'”

再次，任何帮助或者想法会很棒。谢谢

SOLUTION

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

这是非常容易使用TreeView的entered信号做。如果您使用的参数showText的过载需要rect参数，QToolTip会自动完成其余的操作。

这里有一个简单的演示：

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_())