user-interface

问题 This may be a basic question, but I have to admit I've never truly understood what the difference between the Control.Enter and Control.GotFocus events is. http://msdn.microsoft.com/en-us/library/system.windows.forms.control.enter.aspx http://msdn.microsoft.com/en-us/library/system.windows.forms.control.gotfocus.aspx Is it a differentiation between capturing keyboard or mouse input or something else? 回答1: The GotFocus/LostFocus events are generated by Windows messages, WM_SETFOCUS and WM

问题 This may be a basic question, but I have to admit I've never truly understood what the difference between the Control.Enter and Control.GotFocus events is. http://msdn.microsoft.com/en-us/library/system.windows.forms.control.enter.aspx http://msdn.microsoft.com/en-us/library/system.windows.forms.control.gotfocus.aspx Is it a differentiation between capturing keyboard or mouse input or something else? 回答1: The GotFocus/LostFocus events are generated by Windows messages, WM_SETFOCUS and WM

问题 How can I get the OnChanged event in a FileSystemWatcher to invoke a method on the UI thread once the OnChanged event is completed? Or, just for the sake of knowledge, how can I get the OnChanged event to run entirely on the UI thread? 回答1: If you want FileSystemWatcher to raise events on the UI thread and you are using Windows Forms, set the SynchronizingObject to a Control or Form. This isn't as useful if you are using WPF, where there isn't anything that implements ISyncronizeInvoke . You

问题 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class GUI_Borrower extends JFrame implements ActionListener { JPanel panel = new JPanel(); JLabel lblName = new JLabel("Name:"); JLabel lblProg = new JLabel("Program:"); JLabel lblId = new JLabel("Library ID: "); JLabel lblTitle = new JLabel("Add Borrower"); JTextField txtName = new JTextField(10); JTextField txtProg = new JTextField(10); JTextField txtId = new JTextField(10); static int counter = 19000; JButton

问题 import javax.swing.*; import java.awt.*; import java.awt.event.*; public class GUI_Borrower extends JFrame implements ActionListener { JPanel panel = new JPanel(); JLabel lblName = new JLabel("Name:"); JLabel lblProg = new JLabel("Program:"); JLabel lblId = new JLabel("Library ID: "); JLabel lblTitle = new JLabel("Add Borrower"); JTextField txtName = new JTextField(10); JTextField txtProg = new JTextField(10); JTextField txtId = new JTextField(10); static int counter = 19000; JButton

问题 I use code for in-app purchase based on this answer. But I ran into some strange bugs. For example: I have FirstViewController with locked content and PurchasesViewController with purchase buttons. When I click on purchase button in PurchasesViewController , confirm purchase and wait several seconds for notification about the purchase is successful. Next I go back to FirstViewController and see that content unlocked. In this example all works fine. But... Problem: If I click on purchase

问题 I use code for in-app purchase based on this answer. But I ran into some strange bugs. For example: I have FirstViewController with locked content and PurchasesViewController with purchase buttons. When I click on purchase button in PurchasesViewController , confirm purchase and wait several seconds for notification about the purchase is successful. Next I go back to FirstViewController and see that content unlocked. In this example all works fine. But... Problem: If I click on purchase

问题 I use code for in-app purchase based on this answer. But I ran into some strange bugs. For example: I have FirstViewController with locked content and PurchasesViewController with purchase buttons. When I click on purchase button in PurchasesViewController , confirm purchase and wait several seconds for notification about the purchase is successful. Next I go back to FirstViewController and see that content unlocked. In this example all works fine. But... Problem: If I click on purchase

问题 I'm building an application and I want to create an effect similar to this in a ListView. https://css-tricks.com/recreating-the-facebook-messenger-gradient-effect-with-css/ If I would know the widget's position in the build method, I could calculate the gradient of the widget. After the widget is rendered, I can get the position of the widget by a GlobalKey that is assigned to the widget in the build method. This approach isn't working in my case, because I need the position in order to

问题 I just want to create a custom background but I'm not getting how to do that with xml not with image. Here is the xml: <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@layout/ui_shape" tools:context="${relativePackage}.${activityClass}" > </RelativeLayout> and I want like this. Is it possible to create xml like the required