children

问题 Is there a way to get a event from a Panel when a child is added or removed? I'm deriving from a WrapPanel atm. 回答1: There is no public event or protected override that tracks changes Children membership. However a change in the membership of the Children property will ultimately result in a LayoutUpdated event. If you just need to know if the members have been changed then a simple copy of the last count of children would suffice. However if you need to keep track of which members have been

问题 Let's say I've got the following table structure: | ID | ParentID | Name | I'd like to write a recursive PostgreSQL function for getting all child nodes of a node ID passed to it as a parameter. Here's my code so far (I only have one part of the function which gets all the children of the passed ID, and now I need the recursive part): CREATE OR REPLACE FUNCTION GetAllChildren(IN NodeID INTEGER) RETURNS INTEGER AS $$ DECLARE Crs CURSOR FOR SELECT ID, ParentID, Name FROM Tree WHERE ParentID

问题 I have a bit of code that finds an element based on visible text. # Defines the text I am looking for productName = "customer x job" #Finds the element I am looking for inputElement = driver.find_element_by_xpath(".//*[@id='demo_top']/div/table[2]/tbody/tr/td[1]/ul/li[2]/ul/li[1]/a".format(productName)) I need to click a box just to the right of this. The specific xpath of the element is: #What I just found /html/body/div[1]/div/div/table[2]/tbody/tr/td[1]/ul/li[2]/ul/li[1]/a #The box I

问题 I have a bit of code that finds an element based on visible text. # Defines the text I am looking for productName = "customer x job" #Finds the element I am looking for inputElement = driver.find_element_by_xpath(".//*[@id='demo_top']/div/table[2]/tbody/tr/td[1]/ul/li[2]/ul/li[1]/a".format(productName)) I need to click a box just to the right of this. The specific xpath of the element is: #What I just found /html/body/div[1]/div/div/table[2]/tbody/tr/td[1]/ul/li[2]/ul/li[1]/a #The box I

问题 I am using a wpf slider to display the time line in a video player. I need to add an ItemControl of some sort on top of this so that I can add buttons on the time line on certain positions in the time line (the buttons will hold their own position relative to the parent ItemsControl). What ItemsControl container should I use where I can add child elements that know their own position (based on their timecode)? I have looked at the different ItemsControls in Wpf, and it looks like all of them

问题 I am using a wpf slider to display the time line in a video player. I need to add an ItemControl of some sort on top of this so that I can add buttons on the time line on certain positions in the time line (the buttons will hold their own position relative to the parent ItemsControl). What ItemsControl container should I use where I can add child elements that know their own position (based on their timecode)? I have looked at the different ItemsControls in Wpf, and it looks like all of them

问题 Starting from a particular div I want to use jquery to grab the value of the input tag in the next div block (two levels down). I have an HTML structure like this: <div class="firstClass1" id="firstID1"> // suppose I start from this element <div class="secondClass1" id="secondID1"> <input value="myValue1"/> </div> </div> <div class="firstClass2" id="firstID2"> <div class="secondClass2" id="secondID2"> <input value="myValue2"/> </div> </div> <div class="firstClass3" id="firstID3"> <div class=

问题 I am trying to later iterate through the data inside of the Treeview. I will then hope to be able to sort through it. from tkinter import * from tkinter.ttk import * import pickle root = Tk() def treeData(event): children = tree.get_children() print(children) entry = StringVar() a = Entry(root, textvariable=entry) a.grid(column=0,row=0) a.bind("<Key>", function) file_data = [] file = open('data.dat', 'rb') while True: try: file_data.append(pickle.load(file)) except EOFError: break file.close(

问题 I am trying to later iterate through the data inside of the Treeview. I will then hope to be able to sort through it. from tkinter import * from tkinter.ttk import * import pickle root = Tk() def treeData(event): children = tree.get_children() print(children) entry = StringVar() a = Entry(root, textvariable=entry) a.grid(column=0,row=0) a.bind("<Key>", function) file_data = [] file = open('data.dat', 'rb') while True: try: file_data.append(pickle.load(file)) except EOFError: break file.close(

问题 In WPF: <Button Width="24" Height="24" > <Image Source="pack://application:,,,/res/x.png" VerticalAlignment="Center"/> </Button> How can I mimic this in C#? I can't find any method in the Button class that adds children. 回答1: Button is a Content control so you just have to use the Buttons Content property Example: Button myButton = new Button { Width = 24, Height = 24, Content = new Image { Source = new BitmapImage(new Uri("image source")), VerticalAlignment = VerticalAlignment.Center } };